//! MCP agent tools — start, stop, wait, list, and inspect agents via MCP.
use crate::agents::PipelineStage;
use crate::config::ProjectConfig;
use crate::http::context::AppContext;
use crate::http::settings::get_editor_command_from_store;
use crate::slog_warn;
use crate::worktree;
use serde_json::{json, Value};

pub(super) async fn tool_start_agent(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;
    let agent_name = args.get("agent_name").and_then(|v| v.as_str());

    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    let info = ctx
        .agents
        .start_agent(&project_root, story_id, agent_name, None, None)
        .await?;

    // Snapshot coverage baseline from the most recent coverage report (best-effort).
    if let Some(pct) = read_coverage_percent_from_json(&project_root)
        && let Err(e) = crate::http::workflow::write_coverage_baseline_to_story_file(
            &project_root,
            story_id,
            pct,
        )
    {
        slog_warn!("[start_agent] Could not write coverage baseline to story file: {e}");
    }

    serde_json::to_string_pretty(&json!({
        "story_id": info.story_id,
        "agent_name": info.agent_name,
        "status": info.status.to_string(),
        "session_id": info.session_id,
        "worktree_path": info.worktree_path,
    }))
    .map_err(|e| format!("Serialization error: {e}"))
}

/// Try to read the overall line coverage percentage from the llvm-cov JSON report.
///
/// Expects the file at `{project_root}/.huskies/coverage/server.json`.
/// Returns `None` if the file is absent, unreadable, or cannot be parsed.
pub(super) fn read_coverage_percent_from_json(project_root: &std::path::Path) -> Option<f64> {
    let path = project_root
        .join(".huskies")
        .join("coverage")
        .join("server.json");
    let contents = std::fs::read_to_string(&path).ok()?;
    let json: Value = serde_json::from_str(&contents).ok()?;
    // cargo llvm-cov --json format: data[0].totals.lines.percent
    json.pointer("/data/0/totals/lines/percent")
        .and_then(|v| v.as_f64())
}

pub(super) async fn tool_stop_agent(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;
    let agent_name = args
        .get("agent_name")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: agent_name")?;

    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    ctx.agents
        .stop_agent(&project_root, story_id, agent_name)
        .await?;

    Ok(format!("Agent '{agent_name}' for story '{story_id}' stopped."))
}

pub(super) fn tool_list_agents(ctx: &AppContext) -> Result<String, String> {
    let project_root = ctx.agents.get_project_root(&ctx.state).ok();
    let agents = ctx.agents.list_agents()?;
    serde_json::to_string_pretty(&json!(agents
        .iter()
        .filter(|a| {
            project_root
                .as_deref()
                .map(|root| !crate::http::agents::story_is_archived(root, &a.story_id))
                .unwrap_or(true)
        })
        .map(|a| json!({
            "story_id": a.story_id,
            "agent_name": a.agent_name,
            "status": a.status.to_string(),
            "session_id": a.session_id,
            "worktree_path": a.worktree_path,
        }))
        .collect::<Vec<_>>()))
    .map_err(|e| format!("Serialization error: {e}"))
}

/// Read agent session logs from disk and return a human-readable timeline.
///
/// Stitches all session log files for the story together in chronological
/// order. If `agent_name` is omitted, logs from every agent are included.
/// Supports `lines` (tail the last N lines) and `filter` (substring match).
/// If a named agent is currently running, its buffered in-memory events are
/// appended as "live" output so the caller sees everything in one call.
pub(super) async fn tool_get_agent_output(
    args: &Value,
    ctx: &AppContext,
) -> Result<String, String> {
    use crate::agent_log;

    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;
    let agent_name_filter = args.get("agent_name").and_then(|v| v.as_str());
    let tail = args
        .get("lines")
        .and_then(|v| v.as_u64())
        .map(|n| n as usize);
    let filter = args.get("filter").and_then(|v| v.as_str());

    let project_root = ctx.agents.get_project_root(&ctx.state)?;

    // Collect all matching log files, oldest first.
    let log_files =
        agent_log::list_story_log_files(&project_root, story_id, agent_name_filter);

    let mut all_lines: Vec<String> = Vec::new();

    for path in &log_files {
        let file_name = path
            .file_name()
            .and_then(|n| n.to_str())
            .unwrap_or("?");
        all_lines.push(format!("=== {} ===", file_name.trim_end_matches(".log")));
        match agent_log::read_log_as_readable_lines(path) {
            Ok(lines) => all_lines.extend(lines),
            Err(e) => all_lines.push(format!("[ERROR reading log: {e}]")),
        }
        all_lines.push(String::new()); // blank line between sessions
    }

    // Append buffered live events when a specific agent is requested.
    if let Some(agent_name) = agent_name_filter
        && let Ok(live_events) = ctx.agents.drain_events(story_id, agent_name)
        && !live_events.is_empty()
    {
        all_lines.push(format!("=== {agent_name} (live) ==="));
        let now = chrono::Utc::now().to_rfc3339();
        for event in &live_events {
            if let Ok(event_value) = serde_json::to_value(event)
                && let Some(line) =
                    agent_log::format_log_entry_as_text(&now, &event_value)
            {
                all_lines.push(line);
            }
        }
        all_lines.push(String::new());
    }

    if log_files.is_empty() {
        let agent_hint = agent_name_filter
            .map(|n| format!(" agent '{n}'"))
            .unwrap_or_default();
        return Ok(format!(
            "No log files found for story '{story_id}'{agent_hint}."
        ));
    }

    // Apply substring filter (always keep section headers).
    let filtered: Vec<String> = if let Some(f) = filter {
        all_lines
            .into_iter()
            .filter(|l| l.starts_with("===") || l.contains(f))
            .collect()
    } else {
        all_lines
    };

    // Apply tail (last N lines).
    let output = if let Some(n) = tail {
        let start = filtered.len().saturating_sub(n);
        filtered[start..].join("\n")
    } else {
        filtered.join("\n")
    };

    Ok(output)
}

pub(super) fn tool_get_agent_config(ctx: &AppContext) -> Result<String, String> {
    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    let config = ProjectConfig::load(&project_root)?;

    // Collect available (idle) agent names across all stages so the caller can
    // see at a glance which agents are free to start (story 190).
    let mut available_names: std::collections::HashSet<String> =
        std::collections::HashSet::new();
    for stage in &[
        PipelineStage::Coder,
        PipelineStage::Qa,
        PipelineStage::Mergemaster,
        PipelineStage::Other,
    ] {
        if let Ok(names) = ctx.agents.available_agents_for_stage(&config, stage) {
            available_names.extend(names);
        }
    }

    serde_json::to_string_pretty(&json!(config
        .agent
        .iter()
        .map(|a| json!({
            "name": a.name,
            "role": a.role,
            "model": a.model,
            "allowed_tools": a.allowed_tools,
            "max_turns": a.max_turns,
            "max_budget_usd": a.max_budget_usd,
            "available": available_names.contains(&a.name),
        }))
        .collect::<Vec<_>>()))
    .map_err(|e| format!("Serialization error: {e}"))
}

pub(super) async fn tool_wait_for_agent(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;
    let agent_name = args
        .get("agent_name")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: agent_name")?;
    let timeout_ms = args
        .get("timeout_ms")
        .and_then(|v| v.as_u64())
        .unwrap_or(300_000); // default: 5 minutes

    let info = ctx
        .agents
        .wait_for_agent(story_id, agent_name, timeout_ms)
        .await?;

    let commits = match (&info.worktree_path, &info.base_branch) {
        (Some(wt_path), Some(base)) => get_worktree_commits(wt_path, base).await,
        _ => None,
    };

    let completion = info.completion.as_ref().map(|r| json!({
        "summary": r.summary,
        "gates_passed": r.gates_passed,
        "gate_output": r.gate_output,
    }));

    serde_json::to_string_pretty(&json!({
        "story_id": info.story_id,
        "agent_name": info.agent_name,
        "status": info.status.to_string(),
        "session_id": info.session_id,
        "worktree_path": info.worktree_path,
        "base_branch": info.base_branch,
        "commits": commits,
        "completion": completion,
    }))
    .map_err(|e| format!("Serialization error: {e}"))
}

pub(super) async fn tool_create_worktree(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;

    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    let info = ctx.agents.create_worktree(&project_root, story_id).await?;

    serde_json::to_string_pretty(&json!({
        "story_id": story_id,
        "worktree_path": info.path.to_string_lossy(),
        "branch": info.branch,
        "base_branch": info.base_branch,
    }))
    .map_err(|e| format!("Serialization error: {e}"))
}

pub(super) fn tool_list_worktrees(ctx: &AppContext) -> Result<String, String> {
    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    let entries = worktree::list_worktrees(&project_root)?;

    serde_json::to_string_pretty(&json!(entries
        .iter()
        .map(|e| json!({
            "story_id": e.story_id,
            "path": e.path.to_string_lossy(),
        }))
        .collect::<Vec<_>>()))
    .map_err(|e| format!("Serialization error: {e}"))
}

pub(super) async fn tool_remove_worktree(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let story_id = args
        .get("story_id")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: story_id")?;

    let project_root = ctx.agents.get_project_root(&ctx.state)?;
    let config = ProjectConfig::load(&project_root)?;
    worktree::remove_worktree_by_story_id(&project_root, story_id, &config).await?;

    Ok(format!("Worktree for story '{story_id}' removed."))
}

pub(super) fn tool_get_editor_command(args: &Value, ctx: &AppContext) -> Result<String, String> {
    let worktree_path = args
        .get("worktree_path")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: worktree_path")?;

    let editor = get_editor_command_from_store(ctx)
        .ok_or_else(|| "No editor configured. Set one via PUT /api/settings/editor.".to_string())?;

    Ok(format!("{editor} {worktree_path}"))
}

/// Run `git log <base>..HEAD --oneline` in the worktree and return the commit
/// summaries, or `None` if git is unavailable or there are no new commits.
pub(super) async fn get_worktree_commits(worktree_path: &str, base_branch: &str) -> Option<Vec<String>> {
    let wt = worktree_path.to_string();
    let base = base_branch.to_string();
    tokio::task::spawn_blocking(move || {
        let output = std::process::Command::new("git")
            .args(["log", &format!("{base}..HEAD"), "--oneline"])
            .current_dir(&wt)
            .output()
            .ok()?;

        if output.status.success() {
            let lines: Vec<String> = String::from_utf8(output.stdout)
                .ok()?
                .lines()
                .filter(|l| !l.is_empty())
                .map(|l| l.to_string())
                .collect();
            Some(lines)
        } else {
            None
        }
    })
    .await
    .ok()
    .flatten()
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::http::test_helpers::test_ctx;
    use crate::store::StoreOps;

    #[test]
    fn tool_list_agents_empty() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_list_agents(&ctx).unwrap();
        let parsed: Vec<Value> = serde_json::from_str(&result).unwrap();
        assert!(parsed.is_empty());
    }

    #[test]
    fn tool_get_agent_config_no_project_toml_returns_default_agent() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        // No project.toml → default config with one fallback agent
        let result = tool_get_agent_config(&ctx).unwrap();
        let parsed: Vec<Value> = serde_json::from_str(&result).unwrap();
        // Default config contains one agent entry with default values
        assert_eq!(parsed.len(), 1, "default config should have one fallback agent");
        assert!(parsed[0].get("name").is_some());
        assert!(parsed[0].get("role").is_some());
    }

    #[tokio::test]
    async fn tool_get_agent_output_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_get_agent_output(&json!({}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[tokio::test]
    async fn tool_get_agent_output_no_logs_returns_not_found_message() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        // No agent registered, no log file → returns "no log files found" message
        let result = tool_get_agent_output(
            &json!({"story_id": "99_nope", "agent_name": "bot"}),
            &ctx,
        )
        .await
        .unwrap();
        assert!(
            result.contains("No log files found"),
            "expected 'No log files found' message: {result}"
        );
    }

    #[tokio::test]
    async fn tool_get_agent_output_agent_name_is_optional() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        // No agent_name provided — should succeed (no error)
        let result = tool_get_agent_output(
            &json!({"story_id": "99_nope"}),
            &ctx,
        )
        .await
        .unwrap();
        assert!(result.contains("No log files found"));
    }

    #[tokio::test]
    async fn tool_get_agent_output_reads_from_disk() {
        use crate::agent_log::AgentLogWriter;
        use crate::agents::AgentEvent;
        use crate::store::StoreOps;

        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        // Point the store at the tmp root so the tool can find log files.
        ctx.store
            .set("project_root", json!(tmp.path().to_string_lossy().as_ref()));

        // Write a log file
        let mut writer = AgentLogWriter::new(
            tmp.path(),
            "42_story_foo",
            "coder-1",
            "sess-test",
        )
        .unwrap();
        writer
            .write_event(&AgentEvent::Output {
                story_id: "42_story_foo".to_string(),
                agent_name: "coder-1".to_string(),
                text: "My readable output line".to_string(),
            })
            .unwrap();
        writer
            .write_event(&AgentEvent::Done {
                story_id: "42_story_foo".to_string(),
                agent_name: "coder-1".to_string(),
                session_id: Some("sess-test".to_string()),
            })
            .unwrap();
        drop(writer);

        let result = tool_get_agent_output(
            &json!({"story_id": "42_story_foo", "agent_name": "coder-1"}),
            &ctx,
        )
        .await
        .unwrap();

        assert!(
            result.contains("My readable output line"),
            "expected output text in result: {result}"
        );
        assert!(result.contains("DONE"), "expected DONE marker: {result}");
    }

    #[tokio::test]
    async fn tool_get_agent_output_tail_limits_lines() {
        use crate::agent_log::AgentLogWriter;
        use crate::agents::AgentEvent;
        use crate::store::StoreOps;

        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        ctx.store
            .set("project_root", json!(tmp.path().to_string_lossy().as_ref()));

        let mut writer = AgentLogWriter::new(
            tmp.path(),
            "42_story_bar",
            "coder-1",
            "sess-tail",
        )
        .unwrap();
        for i in 0..10 {
            writer
                .write_event(&AgentEvent::Output {
                    story_id: "42_story_bar".to_string(),
                    agent_name: "coder-1".to_string(),
                    text: format!("line {i}"),
                })
                .unwrap();
        }
        drop(writer);

        let result = tool_get_agent_output(
            &json!({"story_id": "42_story_bar", "agent_name": "coder-1", "lines": 3}),
            &ctx,
        )
        .await
        .unwrap();

        // Should contain "line 7", "line 8", "line 9" but NOT "line 0"
        assert!(result.contains("line 9"), "should contain last line: {result}");
        assert!(!result.contains("line 0"), "should not contain early lines: {result}");
    }

    #[tokio::test]
    async fn tool_get_agent_output_filter_narrows_results() {
        use crate::agent_log::AgentLogWriter;
        use crate::agents::AgentEvent;
        use crate::store::StoreOps;

        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        ctx.store
            .set("project_root", json!(tmp.path().to_string_lossy().as_ref()));

        let mut writer = AgentLogWriter::new(
            tmp.path(),
            "42_story_baz",
            "coder-1",
            "sess-filter",
        )
        .unwrap();
        writer
            .write_event(&AgentEvent::Output {
                story_id: "42_story_baz".to_string(),
                agent_name: "coder-1".to_string(),
                text: "needle line here".to_string(),
            })
            .unwrap();
        writer
            .write_event(&AgentEvent::Output {
                story_id: "42_story_baz".to_string(),
                agent_name: "coder-1".to_string(),
                text: "haystack only".to_string(),
            })
            .unwrap();
        drop(writer);

        let result = tool_get_agent_output(
            &json!({"story_id": "42_story_baz", "agent_name": "coder-1", "filter": "needle"}),
            &ctx,
        )
        .await
        .unwrap();

        assert!(result.contains("needle"), "filter should keep matching lines: {result}");
        assert!(!result.contains("haystack"), "filter should remove non-matching lines: {result}");
    }

    #[tokio::test]
    async fn tool_stop_agent_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_stop_agent(&json!({"agent_name": "bot"}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[tokio::test]
    async fn tool_stop_agent_missing_agent_name() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_stop_agent(&json!({"story_id": "1_test"}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("agent_name"));
    }

    #[tokio::test]
    async fn tool_start_agent_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_start_agent(&json!({}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[tokio::test]
    async fn tool_start_agent_no_agent_name_no_coder_returns_clear_error() {
        // Config has only a supervisor — start_agent without agent_name should
        // refuse rather than silently assigning supervisor.
        let tmp = tempfile::tempdir().unwrap();
        let sk = tmp.path().join(".huskies");
        std::fs::create_dir_all(&sk).unwrap();
        std::fs::write(
            sk.join("project.toml"),
            r#"
[[agent]]
name = "supervisor"
stage = "other"
"#,
        )
        .unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_start_agent(&json!({"story_id": "42_my_story"}), &ctx).await;
        assert!(result.is_err());
        let err = result.unwrap_err();
        assert!(
            err.contains("coder"),
            "error should mention 'coder', got: {err}"
        );
    }

    #[tokio::test]
    async fn tool_start_agent_no_agent_name_picks_coder_not_supervisor() {
        // Config has supervisor first, then coder-1. Without agent_name the
        // coder should be selected, not supervisor. The call will fail due to
        // missing git repo / worktree, but the error must NOT be about
        // "No coder agent configured".
        let tmp = tempfile::tempdir().unwrap();
        let sk = tmp.path().join(".huskies");
        std::fs::create_dir_all(&sk).unwrap();
        std::fs::write(
            sk.join("project.toml"),
            r#"
[[agent]]
name = "supervisor"
stage = "other"

[[agent]]
name = "coder-1"
stage = "coder"
"#,
        )
        .unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_start_agent(&json!({"story_id": "42_my_story"}), &ctx).await;
        // May succeed or fail for infrastructure reasons (no git repo), but
        // must NOT fail with "No coder agent configured".
        if let Err(err) = result {
            assert!(
                !err.contains("No coder agent configured"),
                "should not fail on agent selection, got: {err}"
            );
            // Should also not complain about supervisor being absent.
            assert!(
                !err.contains("supervisor"),
                "should not select supervisor, got: {err}"
            );
        }
    }

    #[tokio::test]
    async fn tool_create_worktree_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_create_worktree(&json!({}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[tokio::test]
    async fn tool_remove_worktree_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_remove_worktree(&json!({}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[test]
    fn tool_list_worktrees_empty_dir() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_list_worktrees(&ctx).unwrap();
        let parsed: Vec<Value> = serde_json::from_str(&result).unwrap();
        assert!(parsed.is_empty());
    }

    // ── Editor command tool tests ─────────────────────────────────

    #[test]
    fn tool_get_editor_command_missing_worktree_path() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_get_editor_command(&json!({}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("worktree_path"));
    }

    #[test]
    fn tool_get_editor_command_no_editor_configured() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_get_editor_command(
            &json!({"worktree_path": "/some/path"}),
            &ctx,
        );
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("No editor configured"));
    }

    #[test]
    fn tool_get_editor_command_formats_correctly() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        ctx.store.set("editor_command", json!("zed"));

        let result = tool_get_editor_command(
            &json!({"worktree_path": "/home/user/worktrees/37_my_story"}),
            &ctx,
        )
        .unwrap();
        assert_eq!(result, "zed /home/user/worktrees/37_my_story");
    }

    #[test]
    fn tool_get_editor_command_works_with_vscode() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        ctx.store.set("editor_command", json!("code"));

        let result = tool_get_editor_command(
            &json!({"worktree_path": "/path/to/worktree"}),
            &ctx,
        )
        .unwrap();
        assert_eq!(result, "code /path/to/worktree");
    }

    #[test]
    fn get_editor_command_in_tools_list() {
        use super::super::{handle_tools_list};
        let resp = handle_tools_list(Some(json!(1)));
        let tools = resp.result.unwrap()["tools"].as_array().unwrap().clone();
        let tool = tools.iter().find(|t| t["name"] == "get_editor_command");
        assert!(tool.is_some(), "get_editor_command missing from tools list");
        let t = tool.unwrap();
        assert!(t["description"].is_string());
        let required = t["inputSchema"]["required"].as_array().unwrap();
        let req_names: Vec<&str> = required.iter().map(|v| v.as_str().unwrap()).collect();
        assert!(req_names.contains(&"worktree_path"));
    }

    #[tokio::test]
    async fn wait_for_agent_tool_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_wait_for_agent(&json!({"agent_name": "bot"}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[tokio::test]
    async fn wait_for_agent_tool_missing_agent_name() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_wait_for_agent(&json!({"story_id": "1_test"}), &ctx).await;
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("agent_name"));
    }

    #[tokio::test]
    async fn wait_for_agent_tool_nonexistent_agent_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result =
            tool_wait_for_agent(&json!({"story_id": "99_nope", "agent_name": "bot", "timeout_ms": 50}), &ctx)
                .await;
        // No agent registered — should error
        assert!(result.is_err());
    }

    #[tokio::test]
    async fn wait_for_agent_tool_returns_completed_agent() {
        use crate::agents::AgentStatus;
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        ctx.agents
            .inject_test_agent("41_story", "worker", AgentStatus::Completed);

        let result = tool_wait_for_agent(
            &json!({"story_id": "41_story", "agent_name": "worker"}),
            &ctx,
        )
        .await
        .unwrap();
        let parsed: Value = serde_json::from_str(&result).unwrap();
        assert_eq!(parsed["status"], "completed");
        assert_eq!(parsed["story_id"], "41_story");
        assert_eq!(parsed["agent_name"], "worker");
        // commits key present (may be null since no real worktree)
        assert!(parsed.get("commits").is_some());
        // completion key present (null for agents that didn't call report_completion)
        assert!(parsed.get("completion").is_some());
    }

    #[test]
    fn wait_for_agent_tool_in_list() {
        use super::super::{handle_tools_list};
        let resp = handle_tools_list(Some(json!(1)));
        let tools = resp.result.unwrap()["tools"].as_array().unwrap().clone();
        let wait_tool = tools.iter().find(|t| t["name"] == "wait_for_agent");
        assert!(wait_tool.is_some(), "wait_for_agent missing from tools list");
        let t = wait_tool.unwrap();
        assert!(t["description"].as_str().unwrap().contains("block") || t["description"].as_str().unwrap().contains("Block"));
        let required = t["inputSchema"]["required"].as_array().unwrap();
        let req_names: Vec<&str> = required.iter().map(|v| v.as_str().unwrap()).collect();
        assert!(req_names.contains(&"story_id"));
        assert!(req_names.contains(&"agent_name"));
    }

    #[test]
    fn read_coverage_percent_from_json_parses_llvm_cov_format() {
        use std::fs;
        let tmp = tempfile::tempdir().unwrap();
        let cov_dir = tmp.path().join(".huskies/coverage");
        fs::create_dir_all(&cov_dir).unwrap();
        let json_content = r#"{"data":[{"totals":{"lines":{"count":100,"covered":78,"percent":78.0}}}]}"#;
        fs::write(cov_dir.join("server.json"), json_content).unwrap();

        let pct = read_coverage_percent_from_json(tmp.path());
        assert_eq!(pct, Some(78.0));
    }

    #[test]
    fn read_coverage_percent_from_json_returns_none_when_absent() {
        let tmp = tempfile::tempdir().unwrap();
        let pct = read_coverage_percent_from_json(tmp.path());
        assert!(pct.is_none());
    }
}