use crate::agents::AgentStatus;
use crate::http::context::AppContext;
use crate::io::story_metadata::{parse_front_matter, write_coverage_baseline};
use crate::workflow::{StoryTestResults, TestCaseResult, TestStatus};
use serde::Serialize;
use std::collections::HashMap;
use std::fs;
use std::path::{Path, PathBuf};

/// Agent assignment embedded in a pipeline stage item.
#[derive(Clone, Debug, Serialize)]
pub struct AgentAssignment {
    pub agent_name: String,
    pub model: Option<String>,
    pub status: String,
}

#[derive(Clone, Debug, Serialize)]
pub struct UpcomingStory {
    pub story_id: String,
    pub name: Option<String>,
    pub error: Option<String>,
    /// Merge failure reason persisted to front matter by the mergemaster agent.
    pub merge_failure: Option<String>,
    /// Active agent working on this item, if any.
    pub agent: Option<AgentAssignment>,
}

pub struct StoryValidationResult {
    pub story_id: String,
    pub valid: bool,
    pub error: Option<String>,
}

/// Full pipeline state across all stages.
#[derive(Clone, Debug, Serialize)]
pub struct PipelineState {
    pub upcoming: Vec<UpcomingStory>,
    pub current: Vec<UpcomingStory>,
    pub qa: Vec<UpcomingStory>,
    pub merge: Vec<UpcomingStory>,
    pub done: Vec<UpcomingStory>,
}

/// Load the full pipeline state (all 5 active stages).
pub fn load_pipeline_state(ctx: &AppContext) -> Result<PipelineState, String> {
    let agent_map = build_active_agent_map(ctx);
    Ok(PipelineState {
        upcoming: load_stage_items(ctx, "1_upcoming", &HashMap::new())?,
        current: load_stage_items(ctx, "2_current", &agent_map)?,
        qa: load_stage_items(ctx, "3_qa", &agent_map)?,
        merge: load_stage_items(ctx, "4_merge", &agent_map)?,
        done: load_stage_items(ctx, "5_done", &HashMap::new())?,
    })
}

/// Build a map from story_id → AgentAssignment for all pending/running agents.
fn build_active_agent_map(ctx: &AppContext) -> HashMap<String, AgentAssignment> {
    let agents = match ctx.agents.list_agents() {
        Ok(a) => a,
        Err(_) => return HashMap::new(),
    };

    let config_opt = ctx
        .state
        .get_project_root()
        .ok()
        .and_then(|root| crate::config::ProjectConfig::load(&root).ok());

    let mut map = HashMap::new();
    for agent in agents {
        if !matches!(agent.status, AgentStatus::Pending | AgentStatus::Running) {
            continue;
        }
        let model = config_opt
            .as_ref()
            .and_then(|cfg| cfg.find_agent(&agent.agent_name))
            .and_then(|ac| ac.model.clone());
        map.insert(
            agent.story_id.clone(),
            AgentAssignment {
                agent_name: agent.agent_name,
                model,
                status: agent.status.to_string(),
            },
        );
    }
    map
}

/// Load work items from any pipeline stage directory.
fn load_stage_items(
    ctx: &AppContext,
    stage_dir: &str,
    agent_map: &HashMap<String, AgentAssignment>,
) -> Result<Vec<UpcomingStory>, String> {
    let root = ctx.state.get_project_root()?;
    let dir = root.join(".story_kit").join("work").join(stage_dir);

    if !dir.exists() {
        return Ok(Vec::new());
    }

    let mut stories = Vec::new();
    for entry in fs::read_dir(&dir)
        .map_err(|e| format!("Failed to read {stage_dir} directory: {e}"))?
    {
        let entry = entry.map_err(|e| format!("Failed to read {stage_dir} entry: {e}"))?;
        let path = entry.path();
        if path.extension().and_then(|ext| ext.to_str()) != Some("md") {
            continue;
        }
        let story_id = path
            .file_stem()
            .and_then(|stem| stem.to_str())
            .ok_or_else(|| "Invalid story file name.".to_string())?
            .to_string();
        let contents = fs::read_to_string(&path)
            .map_err(|e| format!("Failed to read story file {}: {e}", path.display()))?;
        let (name, error, merge_failure) = match parse_front_matter(&contents) {
            Ok(meta) => (meta.name, None, meta.merge_failure),
            Err(e) => (None, Some(e.to_string()), None),
        };
        let agent = agent_map.get(&story_id).cloned();
        stories.push(UpcomingStory { story_id, name, error, merge_failure, agent });
    }

    stories.sort_by(|a, b| a.story_id.cmp(&b.story_id));
    Ok(stories)
}

pub fn load_upcoming_stories(ctx: &AppContext) -> Result<Vec<UpcomingStory>, String> {
    load_stage_items(ctx, "1_upcoming", &HashMap::new())
}

/// Shared create-story logic used by both the OpenApi and MCP handlers.
///
/// When `commit` is `true`, the new story file is git-added and committed to
/// the current branch immediately after creation.
pub fn create_story_file(
    root: &std::path::Path,
    name: &str,
    user_story: Option<&str>,
    acceptance_criteria: Option<&[String]>,
    commit: bool,
) -> Result<String, String> {
    let story_number = next_item_number(root)?;
    let slug = slugify_name(name);

    if slug.is_empty() {
        return Err("Name must contain at least one alphanumeric character.".to_string());
    }

    let filename = format!("{story_number}_story_{slug}.md");
    let upcoming_dir = root.join(".story_kit").join("work").join("1_upcoming");
    fs::create_dir_all(&upcoming_dir)
        .map_err(|e| format!("Failed to create upcoming directory: {e}"))?;

    let filepath = upcoming_dir.join(&filename);
    if filepath.exists() {
        return Err(format!("Story file already exists: {filename}"));
    }

    let story_id = filepath
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or_default()
        .to_string();

    let mut content = String::new();
    content.push_str("---\n");
    content.push_str(&format!("name: \"{}\"\n", name.replace('"', "\\\"")));
    content.push_str("---\n\n");
    content.push_str(&format!("# Story {story_number}: {name}\n\n"));

    content.push_str("## User Story\n\n");
    if let Some(us) = user_story {
        content.push_str(us);
        content.push('\n');
    } else {
        content.push_str("As a ..., I want ..., so that ...\n");
    }
    content.push('\n');

    content.push_str("## Acceptance Criteria\n\n");
    if let Some(criteria) = acceptance_criteria {
        for criterion in criteria {
            content.push_str(&format!("- [ ] {criterion}\n"));
        }
    } else {
        content.push_str("- [ ] TODO\n");
    }
    content.push('\n');

    content.push_str("## Out of Scope\n\n");
    content.push_str("- TBD\n");

    fs::write(&filepath, &content)
        .map_err(|e| format!("Failed to write story file: {e}"))?;

    // Watcher handles the git commit asynchronously.
    let _ = commit; // kept for API compat, ignored

    Ok(story_id)
}

// ── Bug file helpers ──────────────────────────────────────────────

/// Create a bug file in `work/1_upcoming/` with a deterministic filename and auto-commit.
///
/// Returns the bug_id (e.g. `"4_bug_login_crash"`).
pub fn create_bug_file(
    root: &Path,
    name: &str,
    description: &str,
    steps_to_reproduce: &str,
    actual_result: &str,
    expected_result: &str,
    acceptance_criteria: Option<&[String]>,
) -> Result<String, String> {
    let bug_number = next_item_number(root)?;
    let slug = slugify_name(name);

    if slug.is_empty() {
        return Err("Name must contain at least one alphanumeric character.".to_string());
    }

    let filename = format!("{bug_number}_bug_{slug}.md");
    let bugs_dir = root.join(".story_kit").join("work").join("1_upcoming");
    fs::create_dir_all(&bugs_dir)
        .map_err(|e| format!("Failed to create upcoming directory: {e}"))?;

    let filepath = bugs_dir.join(&filename);
    if filepath.exists() {
        return Err(format!("Bug file already exists: {filename}"));
    }

    let bug_id = filepath
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or_default()
        .to_string();

    let mut content = String::new();
    content.push_str("---\n");
    content.push_str(&format!("name: \"{}\"\n", name.replace('"', "\\\"")));
    content.push_str("---\n\n");
    content.push_str(&format!("# Bug {bug_number}: {name}\n\n"));
    content.push_str("## Description\n\n");
    content.push_str(description);
    content.push_str("\n\n");
    content.push_str("## How to Reproduce\n\n");
    content.push_str(steps_to_reproduce);
    content.push_str("\n\n");
    content.push_str("## Actual Result\n\n");
    content.push_str(actual_result);
    content.push_str("\n\n");
    content.push_str("## Expected Result\n\n");
    content.push_str(expected_result);
    content.push_str("\n\n");
    content.push_str("## Acceptance Criteria\n\n");
    if let Some(criteria) = acceptance_criteria {
        for criterion in criteria {
            content.push_str(&format!("- [ ] {criterion}\n"));
        }
    } else {
        content.push_str("- [ ] Bug is fixed and verified\n");
    }

    fs::write(&filepath, &content).map_err(|e| format!("Failed to write bug file: {e}"))?;

    // Watcher handles the git commit asynchronously.

    Ok(bug_id)
}

// ── Spike file helpers ────────────────────────────────────────────

/// Create a spike file in `work/1_upcoming/` with a deterministic filename.
///
/// Returns the spike_id (e.g. `"4_spike_filesystem_watcher_architecture"`).
pub fn create_spike_file(
    root: &Path,
    name: &str,
    description: Option<&str>,
) -> Result<String, String> {
    let spike_number = next_item_number(root)?;
    let slug = slugify_name(name);

    if slug.is_empty() {
        return Err("Name must contain at least one alphanumeric character.".to_string());
    }

    let filename = format!("{spike_number}_spike_{slug}.md");
    let upcoming_dir = root.join(".story_kit").join("work").join("1_upcoming");
    fs::create_dir_all(&upcoming_dir)
        .map_err(|e| format!("Failed to create upcoming directory: {e}"))?;

    let filepath = upcoming_dir.join(&filename);
    if filepath.exists() {
        return Err(format!("Spike file already exists: {filename}"));
    }

    let spike_id = filepath
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or_default()
        .to_string();

    let mut content = String::new();
    content.push_str("---\n");
    content.push_str(&format!("name: \"{}\"\n", name.replace('"', "\\\"")));
    content.push_str("---\n\n");
    content.push_str(&format!("# Spike {spike_number}: {name}\n\n"));
    content.push_str("## Question\n\n");
    if let Some(desc) = description {
        content.push_str(desc);
        content.push('\n');
    } else {
        content.push_str("- TBD\n");
    }
    content.push('\n');
    content.push_str("## Hypothesis\n\n");
    content.push_str("- TBD\n\n");
    content.push_str("## Timebox\n\n");
    content.push_str("- TBD\n\n");
    content.push_str("## Investigation Plan\n\n");
    content.push_str("- TBD\n\n");
    content.push_str("## Findings\n\n");
    content.push_str("- TBD\n\n");
    content.push_str("## Recommendation\n\n");
    content.push_str("- TBD\n");

    fs::write(&filepath, &content).map_err(|e| format!("Failed to write spike file: {e}"))?;

    // Watcher handles the git commit asynchronously.

    Ok(spike_id)
}

/// Create a refactor work item file in `work/1_upcoming/`.
///
/// Returns the refactor_id (e.g. `"5_refactor_split_agents_rs"`).
pub fn create_refactor_file(
    root: &Path,
    name: &str,
    description: Option<&str>,
    acceptance_criteria: Option<&[String]>,
) -> Result<String, String> {
    let refactor_number = next_item_number(root)?;
    let slug = slugify_name(name);

    if slug.is_empty() {
        return Err("Name must contain at least one alphanumeric character.".to_string());
    }

    let filename = format!("{refactor_number}_refactor_{slug}.md");
    let upcoming_dir = root.join(".story_kit").join("work").join("1_upcoming");
    fs::create_dir_all(&upcoming_dir)
        .map_err(|e| format!("Failed to create upcoming directory: {e}"))?;

    let filepath = upcoming_dir.join(&filename);
    if filepath.exists() {
        return Err(format!("Refactor file already exists: {filename}"));
    }

    let refactor_id = filepath
        .file_stem()
        .and_then(|s| s.to_str())
        .unwrap_or_default()
        .to_string();

    let mut content = String::new();
    content.push_str("---\n");
    content.push_str(&format!("name: \"{}\"\n", name.replace('"', "\\\"")));
    content.push_str("---\n\n");
    content.push_str(&format!("# Refactor {refactor_number}: {name}\n\n"));
    content.push_str("## Current State\n\n");
    content.push_str("- TBD\n\n");
    content.push_str("## Desired State\n\n");
    if let Some(desc) = description {
        content.push_str(desc);
        content.push('\n');
    } else {
        content.push_str("- TBD\n");
    }
    content.push('\n');
    content.push_str("## Acceptance Criteria\n\n");
    if let Some(criteria) = acceptance_criteria {
        for criterion in criteria {
            content.push_str(&format!("- [ ] {criterion}\n"));
        }
    } else {
        content.push_str("- [ ] Refactoring complete and all tests pass\n");
    }
    content.push('\n');
    content.push_str("## Out of Scope\n\n");
    content.push_str("- TBD\n");

    fs::write(&filepath, &content)
        .map_err(|e| format!("Failed to write refactor file: {e}"))?;

    // Watcher handles the git commit asynchronously.

    Ok(refactor_id)
}

/// Returns true if the item stem (filename without extension) is a bug item.
/// Bug items follow the pattern: {N}_bug_{slug}
fn is_bug_item(stem: &str) -> bool {
    // Format: {digits}_bug_{rest}
    let after_num = stem.trim_start_matches(|c: char| c.is_ascii_digit());
    after_num.starts_with("_bug_")
}

/// Extract the human-readable name from a bug file's first heading.
fn extract_bug_name(path: &Path) -> Option<String> {
    let contents = fs::read_to_string(path).ok()?;
    for line in contents.lines() {
        if let Some(rest) = line.strip_prefix("# Bug ") {
            // Format: "N: Name"
            if let Some(colon_pos) = rest.find(": ") {
                return Some(rest[colon_pos + 2..].to_string());
            }
        }
    }
    None
}

/// List all open bugs — files in `work/1_upcoming/` matching the `_bug_` naming pattern.
///
/// Returns a sorted list of `(bug_id, name)` pairs.
pub fn list_bug_files(root: &Path) -> Result<Vec<(String, String)>, String> {
    let upcoming_dir = root.join(".story_kit").join("work").join("1_upcoming");
    if !upcoming_dir.exists() {
        return Ok(Vec::new());
    }

    let mut bugs = Vec::new();
    for entry in
        fs::read_dir(&upcoming_dir).map_err(|e| format!("Failed to read upcoming directory: {e}"))?
    {
        let entry = entry.map_err(|e| format!("Failed to read entry: {e}"))?;
        let path = entry.path();

        if path.is_dir() {
            continue;
        }

        if path.extension().and_then(|ext| ext.to_str()) != Some("md") {
            continue;
        }

        let stem = path
            .file_stem()
            .and_then(|s| s.to_str())
            .ok_or_else(|| "Invalid file name.".to_string())?;

        // Only include bug items: {N}_bug_{slug}
        if !is_bug_item(stem) {
            continue;
        }

        let bug_id = stem.to_string();
        let name = extract_bug_name(&path).unwrap_or_else(|| bug_id.clone());
        bugs.push((bug_id, name));
    }

    bugs.sort_by(|a, b| a.0.cmp(&b.0));
    Ok(bugs)
}

/// Returns true if the item stem (filename without extension) is a refactor item.
/// Refactor items follow the pattern: {N}_refactor_{slug}
fn is_refactor_item(stem: &str) -> bool {
    let after_num = stem.trim_start_matches(|c: char| c.is_ascii_digit());
    after_num.starts_with("_refactor_")
}

/// List all open refactors — files in `work/1_upcoming/` matching the `_refactor_` naming pattern.
///
/// Returns a sorted list of `(refactor_id, name)` pairs.
pub fn list_refactor_files(root: &Path) -> Result<Vec<(String, String)>, String> {
    let upcoming_dir = root.join(".story_kit").join("work").join("1_upcoming");
    if !upcoming_dir.exists() {
        return Ok(Vec::new());
    }

    let mut refactors = Vec::new();
    for entry in fs::read_dir(&upcoming_dir)
        .map_err(|e| format!("Failed to read upcoming directory: {e}"))?
    {
        let entry = entry.map_err(|e| format!("Failed to read entry: {e}"))?;
        let path = entry.path();

        if path.is_dir() {
            continue;
        }

        if path.extension().and_then(|ext| ext.to_str()) != Some("md") {
            continue;
        }

        let stem = path
            .file_stem()
            .and_then(|s| s.to_str())
            .ok_or_else(|| "Invalid file name.".to_string())?;

        if !is_refactor_item(stem) {
            continue;
        }

        let refactor_id = stem.to_string();
        let name = fs::read_to_string(&path)
            .ok()
            .and_then(|contents| parse_front_matter(&contents).ok())
            .and_then(|m| m.name)
            .unwrap_or_else(|| refactor_id.clone());
        refactors.push((refactor_id, name));
    }

    refactors.sort_by(|a, b| a.0.cmp(&b.0));
    Ok(refactors)
}

/// Locate a work item file by searching all active pipeline stages.
///
/// Searches in priority order: 2_current, 1_upcoming, 3_qa, 4_merge, 5_done, 6_archived.
fn find_story_file(project_root: &Path, story_id: &str) -> Result<PathBuf, String> {
    let filename = format!("{story_id}.md");
    let sk = project_root.join(".story_kit").join("work");
    for stage in &["2_current", "1_upcoming", "3_qa", "4_merge", "5_done", "6_archived"] {
        let path = sk.join(stage).join(&filename);
        if path.exists() {
            return Ok(path);
        }
    }
    Err(format!(
        "Story '{story_id}' not found in any pipeline stage."
    ))
}

/// Check off the Nth unchecked acceptance criterion in a story file and auto-commit.
///
/// `criterion_index` is 0-based among unchecked (`- [ ]`) items.
pub fn check_criterion_in_file(
    project_root: &Path,
    story_id: &str,
    criterion_index: usize,
) -> Result<(), String> {
    let filepath = find_story_file(project_root, story_id)?;
    let contents = fs::read_to_string(&filepath)
        .map_err(|e| format!("Failed to read story file: {e}"))?;

    let mut unchecked_count: usize = 0;
    let mut found = false;
    let new_lines: Vec<String> = contents
        .lines()
        .map(|line| {
            let trimmed = line.trim();
            if let Some(rest) = trimmed.strip_prefix("- [ ] ") {
                if unchecked_count == criterion_index {
                    unchecked_count += 1;
                    found = true;
                    let indent_len = line.len() - trimmed.len();
                    let indent = &line[..indent_len];
                    return format!("{indent}- [x] {rest}");
                }
                unchecked_count += 1;
            }
            line.to_string()
        })
        .collect();

    if !found {
        return Err(format!(
            "Criterion index {criterion_index} out of range. Story '{story_id}' has \
             {unchecked_count} unchecked criteria (indices 0..{}).",
            unchecked_count.saturating_sub(1)
        ));
    }

    let mut new_str = new_lines.join("\n");
    if contents.ends_with('\n') {
        new_str.push('\n');
    }
    fs::write(&filepath, &new_str)
        .map_err(|e| format!("Failed to write story file: {e}"))?;

    // Watcher handles the git commit asynchronously.
    Ok(())
}

/// Add a new acceptance criterion to a story file.
///
/// Appends `- [ ] {criterion}` after the last existing criterion line in the
/// "## Acceptance Criteria" section, or directly after the section heading if
/// the section is empty. The filesystem watcher auto-commits the change.
pub fn add_criterion_to_file(
    project_root: &Path,
    story_id: &str,
    criterion: &str,
) -> Result<(), String> {
    let filepath = find_story_file(project_root, story_id)?;
    let contents = fs::read_to_string(&filepath)
        .map_err(|e| format!("Failed to read story file: {e}"))?;

    let lines: Vec<&str> = contents.lines().collect();
    let mut in_ac_section = false;
    let mut ac_section_start: Option<usize> = None;
    let mut last_criterion_line: Option<usize> = None;

    for (i, line) in lines.iter().enumerate() {
        let trimmed = line.trim();
        if trimmed == "## Acceptance Criteria" {
            in_ac_section = true;
            ac_section_start = Some(i);
            continue;
        }
        if in_ac_section {
            if trimmed.starts_with("## ") {
                break;
            }
            if trimmed.starts_with("- [ ] ") || trimmed.starts_with("- [x] ") {
                last_criterion_line = Some(i);
            }
        }
    }

    let insert_after = last_criterion_line
        .or(ac_section_start)
        .ok_or_else(|| {
            format!("Story '{story_id}' has no '## Acceptance Criteria' section.")
        })?;

    let mut new_lines: Vec<String> = lines.iter().map(|s| s.to_string()).collect();
    new_lines.insert(insert_after + 1, format!("- [ ] {criterion}"));

    let mut new_str = new_lines.join("\n");
    if contents.ends_with('\n') {
        new_str.push('\n');
    }
    fs::write(&filepath, &new_str)
        .map_err(|e| format!("Failed to write story file: {e}"))?;

    // Watcher handles the git commit asynchronously.
    Ok(())
}

/// Replace the content of a named `## Section` in a story file.
///
/// Finds the first occurrence of `## {section_name}` and replaces everything
/// until the next `##` heading (or end of file) with the provided text.
/// Returns an error if the section is not found.
fn replace_section_content(content: &str, section_name: &str, new_text: &str) -> Result<String, String> {
    let lines: Vec<&str> = content.lines().collect();
    let heading = format!("## {section_name}");

    let mut section_start: Option<usize> = None;
    let mut section_end: Option<usize> = None;

    for (i, line) in lines.iter().enumerate() {
        let trimmed = line.trim();
        if trimmed == heading {
            section_start = Some(i);
            continue;
        }
        if section_start.is_some() && trimmed.starts_with("## ") {
            section_end = Some(i);
            break;
        }
    }

    let section_start =
        section_start.ok_or_else(|| format!("Section '{heading}' not found in story file."))?;

    let mut new_lines: Vec<String> = Vec::new();
    // Keep everything up to and including the section heading.
    for line in lines.iter().take(section_start + 1) {
        new_lines.push(line.to_string());
    }
    // Blank line, new content, blank line.
    new_lines.push(String::new());
    new_lines.push(new_text.to_string());
    new_lines.push(String::new());
    // Resume from the next section heading (or EOF).
    let resume_from = section_end.unwrap_or(lines.len());
    for line in lines.iter().skip(resume_from) {
        new_lines.push(line.to_string());
    }

    let mut new_str = new_lines.join("\n");
    if content.ends_with('\n') {
        new_str.push('\n');
    }
    Ok(new_str)
}

/// Update the user story text and/or description in a story file.
///
/// At least one of `user_story` or `description` must be provided.
/// Replaces the content of the corresponding `##` section in place.
/// The filesystem watcher auto-commits the change.
pub fn update_story_in_file(
    project_root: &Path,
    story_id: &str,
    user_story: Option<&str>,
    description: Option<&str>,
) -> Result<(), String> {
    if user_story.is_none() && description.is_none() {
        return Err(
            "At least one of 'user_story' or 'description' must be provided.".to_string(),
        );
    }

    let filepath = find_story_file(project_root, story_id)?;
    let mut contents = fs::read_to_string(&filepath)
        .map_err(|e| format!("Failed to read story file: {e}"))?;

    if let Some(us) = user_story {
        contents = replace_section_content(&contents, "User Story", us)?;
    }
    if let Some(desc) = description {
        contents = replace_section_content(&contents, "Description", desc)?;
    }

    fs::write(&filepath, &contents)
        .map_err(|e| format!("Failed to write story file: {e}"))?;

    // Watcher handles the git commit asynchronously.
    Ok(())
}

fn slugify_name(name: &str) -> String {
    let slug: String = name
        .chars()
        .map(|c| {
            if c.is_ascii_alphanumeric() {
                c.to_ascii_lowercase()
            } else {
                '_'
            }
        })
        .collect();
    // Collapse consecutive underscores and trim edges
    let mut result = String::new();
    let mut prev_underscore = true; // start true to trim leading _
    for ch in slug.chars() {
        if ch == '_' {
            if !prev_underscore {
                result.push('_');
            }
            prev_underscore = true;
        } else {
            result.push(ch);
            prev_underscore = false;
        }
    }
    // Trim trailing underscore
    if result.ends_with('_') {
        result.pop();
    }
    result
}

/// Scan all `work/` subdirectories for the highest item number across all types (stories, bugs, spikes).
fn next_item_number(root: &std::path::Path) -> Result<u32, String> {
    let work_base = root.join(".story_kit").join("work");
    let mut max_num: u32 = 0;

    for subdir in &["1_upcoming", "2_current", "3_qa", "4_merge", "5_done", "6_archived"] {
        let dir = work_base.join(subdir);
        if !dir.exists() {
            continue;
        }
        for entry in
            fs::read_dir(&dir).map_err(|e| format!("Failed to read {subdir} directory: {e}"))?
        {
            let entry = entry.map_err(|e| format!("Failed to read entry: {e}"))?;
            let name = entry.file_name();
            let name_str = name.to_string_lossy();
            // Filename format: {N}_{type}_{slug}.md — extract leading N
            let num_str: String = name_str.chars().take_while(|c| c.is_ascii_digit()).collect();
            if let Ok(n) = num_str.parse::<u32>()
                && n > max_num
            {
                max_num = n;
            }
        }
    }

    Ok(max_num + 1)
}

// ── Test result file persistence ──────────────────────────────────

const TEST_RESULTS_MARKER: &str = "<!-- story-kit-test-results:";

/// Write (or overwrite) the `## Test Results` section in a story file.
///
/// The section contains an HTML comment with JSON for machine parsing and a
/// human-readable summary below it. If the section already exists it is
/// replaced in-place. If the story file is not found, this is a no-op.
pub fn write_test_results_to_story_file(
    project_root: &Path,
    story_id: &str,
    results: &StoryTestResults,
) -> Result<(), String> {
    let path = find_story_file(project_root, story_id)?;
    let contents =
        fs::read_to_string(&path).map_err(|e| format!("Failed to read story file: {e}"))?;

    let json = serde_json::to_string(results)
        .map_err(|e| format!("Failed to serialize test results: {e}"))?;

    let section = build_test_results_section(&json, results);
    let new_contents = replace_or_append_section(&contents, "## Test Results", &section);

    fs::write(&path, &new_contents)
        .map_err(|e| format!("Failed to write story file: {e}"))?;
    Ok(())
}

/// Read test results from the `## Test Results` section of a story file.
///
/// Returns `None` if the file is not found or contains no test results section.
pub fn read_test_results_from_story_file(
    project_root: &Path,
    story_id: &str,
) -> Option<StoryTestResults> {
    let path = find_story_file(project_root, story_id).ok()?;
    let contents = fs::read_to_string(&path).ok()?;
    parse_test_results_from_contents(&contents)
}

/// Write coverage baseline to the front matter of a story file.
///
/// If the story file is not found, this is a no-op (returns Ok).
pub fn write_coverage_baseline_to_story_file(
    project_root: &Path,
    story_id: &str,
    coverage_pct: f64,
) -> Result<(), String> {
    let path = match find_story_file(project_root, story_id) {
        Ok(p) => p,
        Err(_) => return Ok(()), // No story file — skip silently
    };
    write_coverage_baseline(&path, coverage_pct)
}

/// Build the `## Test Results` section text including JSON comment and human-readable summary.
fn build_test_results_section(json: &str, results: &StoryTestResults) -> String {
    let mut s = String::from("## Test Results\n\n");
    s.push_str(&format!("{TEST_RESULTS_MARKER} {json} -->\n\n"));

    // Unit tests
    let (unit_pass, unit_fail) = count_pass_fail(&results.unit);
    s.push_str(&format!(
        "### Unit Tests ({unit_pass} passed, {unit_fail} failed)\n\n"
    ));
    if results.unit.is_empty() {
        s.push_str("*No unit tests recorded.*\n");
    } else {
        for t in &results.unit {
            s.push_str(&format_test_line(t));
        }
    }
    s.push('\n');

    // Integration tests
    let (int_pass, int_fail) = count_pass_fail(&results.integration);
    s.push_str(&format!(
        "### Integration Tests ({int_pass} passed, {int_fail} failed)\n\n"
    ));
    if results.integration.is_empty() {
        s.push_str("*No integration tests recorded.*\n");
    } else {
        for t in &results.integration {
            s.push_str(&format_test_line(t));
        }
    }

    s
}

fn count_pass_fail(tests: &[TestCaseResult]) -> (usize, usize) {
    let pass = tests.iter().filter(|t| t.status == TestStatus::Pass).count();
    (pass, tests.len() - pass)
}

fn format_test_line(t: &TestCaseResult) -> String {
    let icon = if t.status == TestStatus::Pass { "✅" } else { "❌" };
    match &t.details {
        Some(d) if !d.is_empty() => format!("- {icon} {} — {d}\n", t.name),
        _ => format!("- {icon} {}\n", t.name),
    }
}

/// Replace the `## Test Results` section in `contents` with `new_section`,
/// or append it if not present.
fn replace_or_append_section(contents: &str, header: &str, new_section: &str) -> String {
    let lines: Vec<&str> = contents.lines().collect();
    let header_trimmed = header.trim();

    // Find the start of the existing section
    let section_start = lines.iter().position(|l| l.trim() == header_trimmed);

    if let Some(start) = section_start {
        // Find the next `##` heading after the section start (the end of this section)
        let section_end = lines[start + 1..]
            .iter()
            .position(|l| {
                let t = l.trim();
                t.starts_with("## ") && t != header_trimmed
            })
            .map(|i| start + 1 + i)
            .unwrap_or(lines.len());

        let mut result = lines[..start].join("\n");
        if !result.is_empty() {
            result.push('\n');
        }
        result.push_str(new_section);
        if section_end < lines.len() {
            result.push('\n');
            result.push_str(&lines[section_end..].join("\n"));
        }
        if contents.ends_with('\n') {
            result.push('\n');
        }
        result
    } else {
        // Append at the end
        let mut result = contents.trim_end_matches('\n').to_string();
        result.push_str("\n\n");
        result.push_str(new_section);
        if !result.ends_with('\n') {
            result.push('\n');
        }
        result
    }
}

/// Parse `StoryTestResults` from the JSON embedded in the `## Test Results` section.
fn parse_test_results_from_contents(contents: &str) -> Option<StoryTestResults> {
    for line in contents.lines() {
        let trimmed = line.trim();
        if let Some(rest) = trimmed.strip_prefix(TEST_RESULTS_MARKER) {
            // rest looks like: ` {...} -->`
            if let Some(json_end) = rest.rfind("-->") {
                let json_str = rest[..json_end].trim();
                if let Ok(results) = serde_json::from_str::<StoryTestResults>(json_str) {
                    return Some(results);
                }
            }
        }
    }
    None
}

pub fn validate_story_dirs(
    root: &std::path::Path,
) -> Result<Vec<StoryValidationResult>, String> {
    let mut results = Vec::new();

    // Directories to validate: work/2_current/ + work/1_upcoming/
    let dirs_to_validate: Vec<PathBuf> = vec![
        root.join(".story_kit").join("work").join("2_current"),
        root.join(".story_kit").join("work").join("1_upcoming"),
    ];

    for dir in &dirs_to_validate {
        let subdir = dir.file_name().map(|n| n.to_string_lossy().into_owned()).unwrap_or_default();
        if !dir.exists() {
            continue;
        }
        for entry in
            fs::read_dir(dir).map_err(|e| format!("Failed to read {subdir} directory: {e}"))?
        {
            let entry = entry.map_err(|e| format!("Failed to read entry: {e}"))?;
            let path = entry.path();
            if path.extension().and_then(|ext| ext.to_str()) != Some("md") {
                continue;
            }
            let story_id = path
                .file_stem()
                .and_then(|stem| stem.to_str())
                .unwrap_or_default()
                .to_string();
            let contents = fs::read_to_string(&path)
                .map_err(|e| format!("Failed to read {}: {e}", path.display()))?;
            match parse_front_matter(&contents) {
                Ok(meta) => {
                    let mut errors = Vec::new();
                    if meta.name.is_none() {
                        errors.push("Missing 'name' field".to_string());
                    }
                    if errors.is_empty() {
                        results.push(StoryValidationResult {
                            story_id,
                            valid: true,
                            error: None,
                        });
                    } else {
                        results.push(StoryValidationResult {
                            story_id,
                            valid: false,
                            error: Some(errors.join("; ")),
                        });
                    }
                }
                Err(e) => results.push(StoryValidationResult {
                    story_id,
                    valid: false,
                    error: Some(e.to_string()),
                }),
            }
        }
    }

    results.sort_by(|a, b| a.story_id.cmp(&b.story_id));
    Ok(results)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn load_pipeline_state_loads_all_stages() {
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path().to_path_buf();

        for (stage, id) in &[
            ("1_upcoming", "10_story_upcoming"),
            ("2_current", "20_story_current"),
            ("3_qa", "30_story_qa"),
            ("4_merge", "40_story_merge"),
            ("5_done", "50_story_done"),
        ] {
            let dir = root.join(".story_kit").join("work").join(stage);
            fs::create_dir_all(&dir).unwrap();
            fs::write(
                dir.join(format!("{id}.md")),
                format!("---\nname: {id}\n---\n"),
            )
            .unwrap();
        }

        let ctx = crate::http::context::AppContext::new_test(root);
        let state = load_pipeline_state(&ctx).unwrap();

        assert_eq!(state.upcoming.len(), 1);
        assert_eq!(state.upcoming[0].story_id, "10_story_upcoming");

        assert_eq!(state.current.len(), 1);
        assert_eq!(state.current[0].story_id, "20_story_current");

        assert_eq!(state.qa.len(), 1);
        assert_eq!(state.qa[0].story_id, "30_story_qa");

        assert_eq!(state.merge.len(), 1);
        assert_eq!(state.merge[0].story_id, "40_story_merge");

        assert_eq!(state.done.len(), 1);
        assert_eq!(state.done[0].story_id, "50_story_done");
    }

    #[test]
    fn load_upcoming_returns_empty_when_no_dir() {
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path().to_path_buf();
        // No .story_kit directory at all
        let ctx = crate::http::context::AppContext::new_test(root);
        let result = load_upcoming_stories(&ctx).unwrap();
        assert!(result.is_empty());
    }

    #[test]
    fn pipeline_state_includes_agent_for_running_story() {
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path().to_path_buf();

        let current = root.join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(
            current.join("10_story_test.md"),
            "---\nname: Test Story\n---\n# Story\n",
        )
        .unwrap();

        let ctx = crate::http::context::AppContext::new_test(root);
        ctx.agents.inject_test_agent("10_story_test", "coder-1", crate::agents::AgentStatus::Running);

        let state = load_pipeline_state(&ctx).unwrap();

        assert_eq!(state.current.len(), 1);
        let item = &state.current[0];
        assert!(item.agent.is_some(), "running agent should appear on work item");
        let agent = item.agent.as_ref().unwrap();
        assert_eq!(agent.agent_name, "coder-1");
        assert_eq!(agent.status, "running");
    }

    #[test]
    fn pipeline_state_no_agent_for_completed_story() {
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path().to_path_buf();

        let current = root.join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(
            current.join("11_story_done.md"),
            "---\nname: Done Story\n---\n# Story\n",
        )
        .unwrap();

        let ctx = crate::http::context::AppContext::new_test(root);
        ctx.agents.inject_test_agent("11_story_done", "coder-1", crate::agents::AgentStatus::Completed);

        let state = load_pipeline_state(&ctx).unwrap();

        assert_eq!(state.current.len(), 1);
        assert!(
            state.current[0].agent.is_none(),
            "completed agent should not appear on work item"
        );
    }

    #[test]
    fn pipeline_state_pending_agent_included() {
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path().to_path_buf();

        let current = root.join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(
            current.join("12_story_pending.md"),
            "---\nname: Pending Story\n---\n# Story\n",
        )
        .unwrap();

        let ctx = crate::http::context::AppContext::new_test(root);
        ctx.agents.inject_test_agent("12_story_pending", "coder-1", crate::agents::AgentStatus::Pending);

        let state = load_pipeline_state(&ctx).unwrap();

        assert_eq!(state.current.len(), 1);
        let item = &state.current[0];
        assert!(item.agent.is_some(), "pending agent should appear on work item");
        assert_eq!(item.agent.as_ref().unwrap().status, "pending");
    }

    #[test]
    fn load_upcoming_parses_metadata() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(
            upcoming.join("31_story_view_upcoming.md"),
            "---\nname: View Upcoming\n---\n# Story\n",
        )
        .unwrap();
        fs::write(
            upcoming.join("32_story_worktree.md"),
            "---\nname: Worktree Orchestration\n---\n# Story\n",
        )
        .unwrap();

        let ctx = crate::http::context::AppContext::new_test(tmp.path().to_path_buf());
        let stories = load_upcoming_stories(&ctx).unwrap();
        assert_eq!(stories.len(), 2);
        assert_eq!(stories[0].story_id, "31_story_view_upcoming");
        assert_eq!(stories[0].name.as_deref(), Some("View Upcoming"));
        assert_eq!(stories[1].story_id, "32_story_worktree");
        assert_eq!(stories[1].name.as_deref(), Some("Worktree Orchestration"));
    }

    #[test]
    fn load_upcoming_skips_non_md_files() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(upcoming.join(".gitkeep"), "").unwrap();
        fs::write(
            upcoming.join("31_story_example.md"),
            "---\nname: A Story\n---\n",
        )
        .unwrap();

        let ctx = crate::http::context::AppContext::new_test(tmp.path().to_path_buf());
        let stories = load_upcoming_stories(&ctx).unwrap();
        assert_eq!(stories.len(), 1);
        assert_eq!(stories[0].story_id, "31_story_example");
    }

    #[test]
    fn validate_story_dirs_valid_files() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&current).unwrap();
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(
            current.join("28_story_todos.md"),
            "---\nname: Show TODOs\n---\n# Story\n",
        )
        .unwrap();
        fs::write(
            upcoming.join("36_story_front_matter.md"),
            "---\nname: Enforce Front Matter\n---\n# Story\n",
        )
        .unwrap();

        let results = validate_story_dirs(tmp.path()).unwrap();
        assert_eq!(results.len(), 2);
        assert!(results.iter().all(|r| r.valid));
        assert!(results.iter().all(|r| r.error.is_none()));
    }

    #[test]
    fn validate_story_dirs_missing_front_matter() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("28_story_todos.md"), "# No front matter\n").unwrap();

        let results = validate_story_dirs(tmp.path()).unwrap();
        assert_eq!(results.len(), 1);
        assert!(!results[0].valid);
        assert_eq!(results[0].error.as_deref(), Some("Missing front matter"));
    }

    #[test]
    fn validate_story_dirs_missing_required_fields() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("28_story_todos.md"), "---\n---\n# Story\n").unwrap();

        let results = validate_story_dirs(tmp.path()).unwrap();
        assert_eq!(results.len(), 1);
        assert!(!results[0].valid);
        let err = results[0].error.as_deref().unwrap();
        assert!(err.contains("Missing 'name' field"));
    }

    #[test]
    fn validate_story_dirs_empty_when_no_dirs() {
        let tmp = tempfile::tempdir().unwrap();
        let results = validate_story_dirs(tmp.path()).unwrap();
        assert!(results.is_empty());
    }

    // --- slugify_name tests ---

    #[test]
    fn slugify_simple_name() {
        assert_eq!(
            slugify_name("Enforce Front Matter on All Story Files"),
            "enforce_front_matter_on_all_story_files"
        );
    }

    #[test]
    fn slugify_with_special_chars() {
        assert_eq!(slugify_name("Hello, World! (v2)"), "hello_world_v2");
    }

    #[test]
    fn slugify_leading_trailing_underscores() {
        assert_eq!(slugify_name("  spaces  "), "spaces");
    }

    #[test]
    fn slugify_consecutive_separators() {
        assert_eq!(slugify_name("a--b__c  d"), "a_b_c_d");
    }

    #[test]
    fn slugify_empty_after_strip() {
        assert_eq!(slugify_name("!!!"), "");
    }

    #[test]
    fn slugify_already_snake_case() {
        assert_eq!(slugify_name("my_story_name"), "my_story_name");
    }

    // --- next_item_number tests ---

    #[test]
    fn next_item_number_empty_dirs() {
        let tmp = tempfile::tempdir().unwrap();
        let base = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&base).unwrap();
        assert_eq!(next_item_number(tmp.path()).unwrap(), 1);
    }

    #[test]
    fn next_item_number_scans_all_dirs() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        let current = tmp.path().join(".story_kit/work/2_current");
        let archived = tmp.path().join(".story_kit/work/5_done");
        fs::create_dir_all(&upcoming).unwrap();
        fs::create_dir_all(&current).unwrap();
        fs::create_dir_all(&archived).unwrap();
        fs::write(upcoming.join("10_story_foo.md"), "").unwrap();
        fs::write(current.join("20_story_bar.md"), "").unwrap();
        fs::write(archived.join("15_story_baz.md"), "").unwrap();
        assert_eq!(next_item_number(tmp.path()).unwrap(), 21);
    }

    #[test]
    fn next_item_number_no_work_dirs() {
        let tmp = tempfile::tempdir().unwrap();
        // No .story_kit at all
        assert_eq!(next_item_number(tmp.path()).unwrap(), 1);
    }

    // --- create_story integration tests ---

    #[test]
    fn create_story_writes_correct_content() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(upcoming.join("36_story_existing.md"), "").unwrap();

        let number = next_item_number(tmp.path()).unwrap();
        assert_eq!(number, 37);

        let slug = slugify_name("My New Feature");
        assert_eq!(slug, "my_new_feature");

        let filename = format!("{number}_{slug}.md");
        let filepath = upcoming.join(&filename);

        let mut content = String::new();
        content.push_str("---\n");
        content.push_str("name: \"My New Feature\"\n");
        content.push_str("---\n\n");
        content.push_str(&format!("# Story {number}: My New Feature\n\n"));
        content.push_str("## User Story\n\n");
        content.push_str("As a dev, I want this feature\n\n");
        content.push_str("## Acceptance Criteria\n\n");
        content.push_str("- [ ] It works\n");
        content.push_str("- [ ] It is tested\n\n");
        content.push_str("## Out of Scope\n\n");
        content.push_str("- TBD\n");

        fs::write(&filepath, &content).unwrap();

        let written = fs::read_to_string(&filepath).unwrap();
        assert!(written.starts_with("---\nname: \"My New Feature\"\n---"));
        assert!(written.contains("# Story 37: My New Feature"));
        assert!(written.contains("- [ ] It works"));
        assert!(written.contains("- [ ] It is tested"));
        assert!(written.contains("## Out of Scope"));
    }

    #[test]
    fn create_story_with_colon_in_name_produces_valid_yaml() {
        let tmp = tempfile::tempdir().unwrap();
        let name = "Server-owned agent completion: remove report_completion dependency";
        let result = create_story_file(tmp.path(), name, None, None, false);
        assert!(result.is_ok(), "create_story_file failed: {result:?}");

        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        let story_id = result.unwrap();
        let filename = format!("{story_id}.md");
        let contents = fs::read_to_string(upcoming.join(&filename)).unwrap();

        let meta = parse_front_matter(&contents).expect("front matter should be valid YAML");
        assert_eq!(meta.name.as_deref(), Some(name));
    }

    #[test]
    fn create_story_rejects_duplicate() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();

        let filepath = upcoming.join("1_story_my_feature.md");
        fs::write(&filepath, "existing").unwrap();

        // Simulate the check
        assert!(filepath.exists());
    }

    // ── check_criterion_in_file tests ─────────────────────────────────────────

    fn setup_git_repo(root: &std::path::Path) {
        std::process::Command::new("git")
            .args(["init"])
            .current_dir(root)
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["config", "user.email", "test@test.com"])
            .current_dir(root)
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["config", "user.name", "Test"])
            .current_dir(root)
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["commit", "--allow-empty", "-m", "init"])
            .current_dir(root)
            .output()
            .unwrap();
    }

    fn story_with_criteria(n: usize) -> String {
        let mut s = "---\nname: Test Story\n---\n\n## Acceptance Criteria\n\n".to_string();
        for i in 0..n {
            s.push_str(&format!("- [ ] Criterion {i}\n"));
        }
        s
    }

    #[test]
    fn check_criterion_marks_first_unchecked() {
        let tmp = tempfile::tempdir().unwrap();
        setup_git_repo(tmp.path());
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("1_test.md");
        fs::write(&filepath, story_with_criteria(3)).unwrap();
        std::process::Command::new("git")
            .args(["add", "."])
            .current_dir(tmp.path())
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["commit", "-m", "add story"])
            .current_dir(tmp.path())
            .output()
            .unwrap();

        check_criterion_in_file(tmp.path(), "1_test", 0).unwrap();

        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(contents.contains("- [x] Criterion 0"), "first should be checked");
        assert!(contents.contains("- [ ] Criterion 1"), "second should stay unchecked");
        assert!(contents.contains("- [ ] Criterion 2"), "third should stay unchecked");
    }

    #[test]
    fn check_criterion_marks_second_unchecked() {
        let tmp = tempfile::tempdir().unwrap();
        setup_git_repo(tmp.path());
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("2_test.md");
        fs::write(&filepath, story_with_criteria(3)).unwrap();
        std::process::Command::new("git")
            .args(["add", "."])
            .current_dir(tmp.path())
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["commit", "-m", "add story"])
            .current_dir(tmp.path())
            .output()
            .unwrap();

        check_criterion_in_file(tmp.path(), "2_test", 1).unwrap();

        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(contents.contains("- [ ] Criterion 0"), "first should stay unchecked");
        assert!(contents.contains("- [x] Criterion 1"), "second should be checked");
        assert!(contents.contains("- [ ] Criterion 2"), "third should stay unchecked");
    }

    #[test]
    fn check_criterion_out_of_range_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        setup_git_repo(tmp.path());
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("3_test.md");
        fs::write(&filepath, story_with_criteria(2)).unwrap();
        std::process::Command::new("git")
            .args(["add", "."])
            .current_dir(tmp.path())
            .output()
            .unwrap();
        std::process::Command::new("git")
            .args(["commit", "-m", "add story"])
            .current_dir(tmp.path())
            .output()
            .unwrap();

        let result = check_criterion_in_file(tmp.path(), "3_test", 5);
        assert!(result.is_err(), "should fail for out-of-range index");
        assert!(result.unwrap_err().contains("out of range"));
    }

    #[test]
    fn find_story_file_searches_current_then_upcoming() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&current).unwrap();
        fs::create_dir_all(&upcoming).unwrap();

        // Only in upcoming
        fs::write(upcoming.join("6_test.md"), "").unwrap();
        let found = find_story_file(tmp.path(), "6_test").unwrap();
        assert!(found.ends_with("1_upcoming/6_test.md") || found.ends_with("1_upcoming\\6_test.md"));

        // Also in current — current should win
        fs::write(current.join("6_test.md"), "").unwrap();
        let found = find_story_file(tmp.path(), "6_test").unwrap();
        assert!(found.ends_with("2_current/6_test.md") || found.ends_with("2_current\\6_test.md"));
    }

    #[test]
    fn find_story_file_returns_error_when_not_found() {
        let tmp = tempfile::tempdir().unwrap();
        let result = find_story_file(tmp.path(), "99_missing");
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("not found"));
    }

    // ── add_criterion_to_file tests ───────────────────────────────────────────

    fn story_with_ac_section(criteria: &[&str]) -> String {
        let mut s = "---\nname: Test\n---\n\n## User Story\n\nAs a user...\n\n## Acceptance Criteria\n\n".to_string();
        for c in criteria {
            s.push_str(&format!("- [ ] {c}\n"));
        }
        s.push_str("\n## Out of Scope\n\n- N/A\n");
        s
    }

    #[test]
    fn add_criterion_appends_after_last_criterion() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("10_test.md");
        fs::write(&filepath, story_with_ac_section(&["First", "Second"])).unwrap();

        add_criterion_to_file(tmp.path(), "10_test", "Third").unwrap();

        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(contents.contains("- [ ] First\n"));
        assert!(contents.contains("- [ ] Second\n"));
        assert!(contents.contains("- [ ] Third\n"));
        // Third should come after Second
        let pos_second = contents.find("- [ ] Second").unwrap();
        let pos_third = contents.find("- [ ] Third").unwrap();
        assert!(pos_third > pos_second, "Third should appear after Second");
    }

    #[test]
    fn add_criterion_to_empty_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("11_test.md");
        let content = "---\nname: Test\n---\n\n## Acceptance Criteria\n\n## Out of Scope\n\n- N/A\n";
        fs::write(&filepath, content).unwrap();

        add_criterion_to_file(tmp.path(), "11_test", "New AC").unwrap();

        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(contents.contains("- [ ] New AC\n"), "criterion should be present");
    }

    #[test]
    fn add_criterion_missing_section_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("12_test.md");
        fs::write(&filepath, "---\nname: Test\n---\n\nNo AC section here.\n").unwrap();

        let result = add_criterion_to_file(tmp.path(), "12_test", "X");
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("Acceptance Criteria"));
    }

    // ── update_story_in_file tests ─────────────────────────────────────────────

    #[test]
    fn update_story_replaces_user_story_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("20_test.md");
        let content = "---\nname: T\n---\n\n## User Story\n\nOld text\n\n## Acceptance Criteria\n\n- [ ] AC\n";
        fs::write(&filepath, content).unwrap();

        update_story_in_file(tmp.path(), "20_test", Some("New user story text"), None).unwrap();

        let result = fs::read_to_string(&filepath).unwrap();
        assert!(result.contains("New user story text"), "new text should be present");
        assert!(!result.contains("Old text"), "old text should be replaced");
        assert!(result.contains("## Acceptance Criteria"), "other sections preserved");
    }

    #[test]
    fn update_story_replaces_description_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let filepath = current.join("21_test.md");
        let content = "---\nname: T\n---\n\n## Description\n\nOld description\n\n## Acceptance Criteria\n\n- [ ] AC\n";
        fs::write(&filepath, content).unwrap();

        update_story_in_file(tmp.path(), "21_test", None, Some("New description")).unwrap();

        let result = fs::read_to_string(&filepath).unwrap();
        assert!(result.contains("New description"), "new description present");
        assert!(!result.contains("Old description"), "old description replaced");
    }

    #[test]
    fn update_story_no_args_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("22_test.md"), "---\nname: T\n---\n").unwrap();

        let result = update_story_in_file(tmp.path(), "22_test", None, None);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("At least one"));
    }

    #[test]
    fn update_story_missing_section_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(
            current.join("23_test.md"),
            "---\nname: T\n---\n\nNo sections here.\n",
        )
        .unwrap();

        let result = update_story_in_file(tmp.path(), "23_test", Some("new text"), None);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("User Story"));
    }

    // ── Bug file helper tests ──────────────────────────────────────────────────

    #[test]
    fn next_item_number_starts_at_1_when_empty_bugs() {
        let tmp = tempfile::tempdir().unwrap();
        assert_eq!(next_item_number(tmp.path()).unwrap(), 1);
    }

    #[test]
    fn next_item_number_increments_from_existing_bugs() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(upcoming.join("1_bug_crash.md"), "").unwrap();
        fs::write(upcoming.join("3_bug_another.md"), "").unwrap();
        assert_eq!(next_item_number(tmp.path()).unwrap(), 4);
    }

    #[test]
    fn next_item_number_scans_archived_too() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        let archived = tmp.path().join(".story_kit/work/5_done");
        fs::create_dir_all(&upcoming).unwrap();
        fs::create_dir_all(&archived).unwrap();
        fs::write(archived.join("5_bug_old.md"), "").unwrap();
        assert_eq!(next_item_number(tmp.path()).unwrap(), 6);
    }

    #[test]
    fn list_bug_files_empty_when_no_bugs_dir() {
        let tmp = tempfile::tempdir().unwrap();
        let result = list_bug_files(tmp.path()).unwrap();
        assert!(result.is_empty());
    }

    #[test]
    fn list_bug_files_excludes_archive_subdir() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming_dir = tmp.path().join(".story_kit/work/1_upcoming");
        let archived_dir = tmp.path().join(".story_kit/work/5_done");
        fs::create_dir_all(&upcoming_dir).unwrap();
        fs::create_dir_all(&archived_dir).unwrap();
        fs::write(upcoming_dir.join("1_bug_open.md"), "# Bug 1: Open Bug\n").unwrap();
        fs::write(archived_dir.join("2_bug_closed.md"), "# Bug 2: Closed Bug\n").unwrap();

        let result = list_bug_files(tmp.path()).unwrap();
        assert_eq!(result.len(), 1);
        assert_eq!(result[0].0, "1_bug_open");
        assert_eq!(result[0].1, "Open Bug");
    }

    #[test]
    fn list_bug_files_sorted_by_id() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming_dir = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming_dir).unwrap();
        fs::write(upcoming_dir.join("3_bug_third.md"), "# Bug 3: Third\n").unwrap();
        fs::write(upcoming_dir.join("1_bug_first.md"), "# Bug 1: First\n").unwrap();
        fs::write(upcoming_dir.join("2_bug_second.md"), "# Bug 2: Second\n").unwrap();

        let result = list_bug_files(tmp.path()).unwrap();
        assert_eq!(result.len(), 3);
        assert_eq!(result[0].0, "1_bug_first");
        assert_eq!(result[1].0, "2_bug_second");
        assert_eq!(result[2].0, "3_bug_third");
    }

    #[test]
    fn extract_bug_name_parses_heading() {
        let tmp = tempfile::tempdir().unwrap();
        let path = tmp.path().join("bug-1-crash.md");
        fs::write(&path, "# Bug 1: Login page crashes\n\n## Description\n").unwrap();
        let name = extract_bug_name(&path).unwrap();
        assert_eq!(name, "Login page crashes");
    }

    #[test]
    fn create_bug_file_writes_correct_content() {
        let tmp = tempfile::tempdir().unwrap();
        setup_git_repo(tmp.path());

        let bug_id = create_bug_file(
            tmp.path(),
            "Login Crash",
            "The login page crashes on submit.",
            "1. Go to /login\n2. Click submit",
            "Page crashes with 500 error",
            "Login succeeds",
            Some(&["Login form submits without error".to_string()]),
        )
        .unwrap();

        assert_eq!(bug_id, "1_bug_login_crash");

        let filepath = tmp
            .path()
            .join(".story_kit/work/1_upcoming/1_bug_login_crash.md");
        assert!(filepath.exists());
        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(
            contents.starts_with("---\nname: \"Login Crash\"\n---"),
            "bug file must start with YAML front matter"
        );
        assert!(contents.contains("# Bug 1: Login Crash"));
        assert!(contents.contains("## Description"));
        assert!(contents.contains("The login page crashes on submit."));
        assert!(contents.contains("## How to Reproduce"));
        assert!(contents.contains("1. Go to /login"));
        assert!(contents.contains("## Actual Result"));
        assert!(contents.contains("Page crashes with 500 error"));
        assert!(contents.contains("## Expected Result"));
        assert!(contents.contains("Login succeeds"));
        assert!(contents.contains("## Acceptance Criteria"));
        assert!(contents.contains("- [ ] Login form submits without error"));
    }

    #[test]
    fn create_bug_file_rejects_empty_name() {
        let tmp = tempfile::tempdir().unwrap();
        let result = create_bug_file(tmp.path(), "!!!", "desc", "steps", "actual", "expected", None);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("alphanumeric"));
    }

    #[test]
    fn create_bug_file_uses_default_acceptance_criterion() {
        let tmp = tempfile::tempdir().unwrap();
        setup_git_repo(tmp.path());

        create_bug_file(
            tmp.path(),
            "Some Bug",
            "desc",
            "steps",
            "actual",
            "expected",
            None,
        )
        .unwrap();

        let filepath = tmp.path().join(".story_kit/work/1_upcoming/1_bug_some_bug.md");
        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(
            contents.starts_with("---\nname: \"Some Bug\"\n---"),
            "bug file must have YAML front matter"
        );
        assert!(contents.contains("- [ ] Bug is fixed and verified"));
    }

    // ── create_spike_file tests ────────────────────────────────────────────────

    #[test]
    fn create_spike_file_writes_correct_content() {
        let tmp = tempfile::tempdir().unwrap();

        let spike_id =
            create_spike_file(tmp.path(), "Filesystem Watcher Architecture", None).unwrap();

        assert_eq!(spike_id, "1_spike_filesystem_watcher_architecture");

        let filepath = tmp
            .path()
            .join(".story_kit/work/1_upcoming/1_spike_filesystem_watcher_architecture.md");
        assert!(filepath.exists());
        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(
            contents.starts_with("---\nname: \"Filesystem Watcher Architecture\"\n---"),
            "spike file must start with YAML front matter"
        );
        assert!(contents.contains("# Spike 1: Filesystem Watcher Architecture"));
        assert!(contents.contains("## Question"));
        assert!(contents.contains("## Hypothesis"));
        assert!(contents.contains("## Timebox"));
        assert!(contents.contains("## Investigation Plan"));
        assert!(contents.contains("## Findings"));
        assert!(contents.contains("## Recommendation"));
    }

    #[test]
    fn create_spike_file_uses_description_when_provided() {
        let tmp = tempfile::tempdir().unwrap();
        let description = "What is the best approach for watching filesystem events?";

        create_spike_file(tmp.path(), "FS Watcher Spike", Some(description)).unwrap();

        let filepath =
            tmp.path().join(".story_kit/work/1_upcoming/1_spike_fs_watcher_spike.md");
        let contents = fs::read_to_string(&filepath).unwrap();
        assert!(contents.contains(description));
    }

    #[test]
    fn create_spike_file_uses_placeholder_when_no_description() {
        let tmp = tempfile::tempdir().unwrap();
        create_spike_file(tmp.path(), "My Spike", None).unwrap();

        let filepath = tmp.path().join(".story_kit/work/1_upcoming/1_spike_my_spike.md");
        let contents = fs::read_to_string(&filepath).unwrap();
        // Should have placeholder TBD in Question section
        assert!(contents.contains("## Question\n\n- TBD\n"));
    }

    #[test]
    fn create_spike_file_rejects_empty_name() {
        let tmp = tempfile::tempdir().unwrap();
        let result = create_spike_file(tmp.path(), "!!!", None);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("alphanumeric"));
    }

    #[test]
    fn create_spike_file_with_special_chars_in_name_produces_valid_yaml() {
        let tmp = tempfile::tempdir().unwrap();
        let name = "Spike: compare \"fast\" vs slow encoders";
        let result = create_spike_file(tmp.path(), name, None);
        assert!(result.is_ok(), "create_spike_file failed: {result:?}");

        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        let spike_id = result.unwrap();
        let filename = format!("{spike_id}.md");
        let contents = fs::read_to_string(upcoming.join(&filename)).unwrap();

        let meta = parse_front_matter(&contents).expect("front matter should be valid YAML");
        assert_eq!(meta.name.as_deref(), Some(name));
    }

    #[test]
    fn create_spike_file_increments_from_existing_items() {
        let tmp = tempfile::tempdir().unwrap();
        let upcoming = tmp.path().join(".story_kit/work/1_upcoming");
        fs::create_dir_all(&upcoming).unwrap();
        fs::write(upcoming.join("5_story_existing.md"), "").unwrap();

        let spike_id = create_spike_file(tmp.path(), "My Spike", None).unwrap();
        assert!(spike_id.starts_with("6_spike_"), "expected spike number 6, got: {spike_id}");
    }

    // ── Test result file persistence ──────────────────────────────

    use crate::workflow::{StoryTestResults, TestCaseResult, TestStatus};

    fn make_results() -> StoryTestResults {
        StoryTestResults {
            unit: vec![
                TestCaseResult { name: "unit-pass".to_string(), status: TestStatus::Pass, details: None },
                TestCaseResult { name: "unit-fail".to_string(), status: TestStatus::Fail, details: Some("assertion failed".to_string()) },
            ],
            integration: vec![
                TestCaseResult { name: "int-pass".to_string(), status: TestStatus::Pass, details: None },
            ],
        }
    }

    #[test]
    fn write_and_read_test_results_roundtrip() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("1_story_test.md"), "---\nname: Test\n---\n# Story\n").unwrap();

        let results = make_results();
        write_test_results_to_story_file(tmp.path(), "1_story_test", &results).unwrap();

        let read_back = read_test_results_from_story_file(tmp.path(), "1_story_test")
            .expect("should read back results");
        assert_eq!(read_back.unit.len(), 2);
        assert_eq!(read_back.integration.len(), 1);
        assert_eq!(read_back.unit[0].name, "unit-pass");
        assert_eq!(read_back.unit[1].status, TestStatus::Fail);
        assert_eq!(read_back.unit[1].details.as_deref(), Some("assertion failed"));
    }

    #[test]
    fn write_test_results_creates_readable_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let story_path = current.join("2_story_check.md");
        fs::write(&story_path, "---\nname: Check\n---\n# Story\n\n## Acceptance Criteria\n\n- [ ] AC1\n").unwrap();

        let results = make_results();
        write_test_results_to_story_file(tmp.path(), "2_story_check", &results).unwrap();

        let contents = fs::read_to_string(&story_path).unwrap();
        assert!(contents.contains("## Test Results"));
        assert!(contents.contains("✅ unit-pass"));
        assert!(contents.contains("❌ unit-fail"));
        assert!(contents.contains("assertion failed"));
        assert!(contents.contains("story-kit-test-results:"));
        // Original content still present
        assert!(contents.contains("## Acceptance Criteria"));
    }

    #[test]
    fn write_test_results_overwrites_existing_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        let story_path = current.join("3_story_overwrite.md");
        fs::write(
            &story_path,
            "---\nname: Overwrite\n---\n# Story\n\n## Test Results\n\n<!-- story-kit-test-results: {} -->\n\n### Unit Tests (0 passed, 0 failed)\n\n*No unit tests recorded.*\n",
        )
        .unwrap();

        let results = make_results();
        write_test_results_to_story_file(tmp.path(), "3_story_overwrite", &results).unwrap();

        let contents = fs::read_to_string(&story_path).unwrap();
        assert!(contents.contains("✅ unit-pass"));
        // Should have only one ## Test Results header
        let count = contents.matches("## Test Results").count();
        assert_eq!(count, 1, "should have exactly one ## Test Results section");
    }

    #[test]
    fn read_test_results_returns_none_when_no_section() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("4_story_empty.md"), "---\nname: Empty\n---\n# Story\n").unwrap();

        let result = read_test_results_from_story_file(tmp.path(), "4_story_empty");
        assert!(result.is_none());
    }

    #[test]
    fn read_test_results_returns_none_for_unknown_story() {
        let tmp = tempfile::tempdir().unwrap();
        let result = read_test_results_from_story_file(tmp.path(), "99_story_unknown");
        assert!(result.is_none());
    }

    #[test]
    fn write_test_results_finds_story_in_any_stage() {
        let tmp = tempfile::tempdir().unwrap();
        let qa_dir = tmp.path().join(".story_kit/work/3_qa");
        fs::create_dir_all(&qa_dir).unwrap();
        fs::write(qa_dir.join("5_story_qa.md"), "---\nname: QA Story\n---\n# Story\n").unwrap();

        let results = StoryTestResults {
            unit: vec![TestCaseResult { name: "u1".to_string(), status: TestStatus::Pass, details: None }],
            integration: vec![],
        };
        write_test_results_to_story_file(tmp.path(), "5_story_qa", &results).unwrap();

        let read_back = read_test_results_from_story_file(tmp.path(), "5_story_qa").unwrap();
        assert_eq!(read_back.unit.len(), 1);
    }

    #[test]
    fn write_coverage_baseline_to_story_file_updates_front_matter() {
        let tmp = tempfile::tempdir().unwrap();
        let current = tmp.path().join(".story_kit/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("6_story_cov.md"), "---\nname: Cov Story\n---\n# Story\n").unwrap();

        write_coverage_baseline_to_story_file(tmp.path(), "6_story_cov", 75.4).unwrap();

        let contents = fs::read_to_string(current.join("6_story_cov.md")).unwrap();
        assert!(contents.contains("coverage_baseline: 75.4%"), "got: {contents}");
    }

    #[test]
    fn write_coverage_baseline_to_story_file_silent_on_missing_story() {
        let tmp = tempfile::tempdir().unwrap();
        // Story doesn't exist — should succeed silently
        let result = write_coverage_baseline_to_story_file(tmp.path(), "99_story_missing", 50.0);
        assert!(result.is_ok());
    }

    #[test]
    fn replace_or_append_section_appends_when_absent() {
        let contents = "---\nname: T\n---\n# Story\n";
        let new = replace_or_append_section(contents, "## Test Results", "## Test Results\n\nfoo\n");
        assert!(new.contains("## Test Results"));
        assert!(new.contains("foo"));
        assert!(new.contains("# Story"));
    }

    #[test]
    fn replace_or_append_section_replaces_existing() {
        let contents = "# Story\n\n## Test Results\n\nold content\n\n## Other\n\nother content\n";
        let new = replace_or_append_section(contents, "## Test Results", "## Test Results\n\nnew content\n");
        assert!(new.contains("new content"));
        assert!(!new.contains("old content"));
        assert!(new.contains("## Other"));
    }
}