//! Acceptance-criteria MCP tools (todos, record_tests, ensure_acceptance, check/edit/add/remove).

#![allow(unused_imports, dead_code)]
#[allow(unused_imports)]
use crate::agents::{
    close_bug_to_archive, feature_branch_has_unmerged_changes, move_story_to_done,
};
use crate::http::context::AppContext;
use crate::http::workflow::{
    add_criterion_to_file, check_criterion_in_file, create_bug_file, create_refactor_file,
    create_spike_file, create_story_file, edit_criterion_in_file, list_bug_files,
    list_refactor_files, load_pipeline_state, load_upcoming_stories, remove_criterion_from_file,
    update_story_in_file, validate_story_dirs,
};
use crate::io::story_metadata::{
    check_archived_deps, check_archived_deps_from_list, parse_front_matter, parse_unchecked_todos,
};
use crate::service::story::parse_test_cases;
use crate::slog_warn;
#[allow(unused_imports)]
use crate::workflow::{TestCaseResult, TestStatus, evaluate_acceptance_with_coverage};
use serde_json::{Value, json};
use std::collections::HashMap;
use std::fs;

pub(crate) fn tool_get_story_todos(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 root = ctx.state.get_project_root()?;

    // Read from DB content store, falling back to filesystem.
    let contents = crate::http::workflow::read_story_content(&root, story_id)
        .map_err(|_| format!("Story file not found: {story_id}.md"))?;

    let story_name = parse_front_matter(&contents).ok().and_then(|m| m.name);
    let todos = parse_unchecked_todos(&contents);

    serde_json::to_string_pretty(&json!({
        "story_id": story_id,
        "story_name": story_name,
        "todos": todos,
    }))
    .map_err(|e| format!("Serialization error: {e}"))
}

pub(crate) fn tool_record_tests(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 unit = parse_test_cases(args.get("unit"))?;
    let integration = parse_test_cases(args.get("integration"))?;

    let mut workflow = ctx
        .workflow
        .lock()
        .map_err(|e| format!("Lock error: {e}"))?;

    workflow.record_test_results_validated(story_id.to_string(), unit, integration)?;

    // Persist to story file (best-effort — file write errors are warnings, not failures).
    if let Ok(project_root) = ctx.state.get_project_root()
        && let Some(results) = workflow.results.get(story_id)
        && let Err(e) = crate::http::workflow::write_test_results_to_story_file(
            &project_root,
            story_id,
            results,
        )
    {
        slog_warn!("[record_tests] Could not persist results to story file: {e}");
    }

    Ok("Test results recorded.".to_string())
}

pub(crate) fn tool_ensure_acceptance(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 workflow = ctx
        .workflow
        .lock()
        .map_err(|e| format!("Lock error: {e}"))?;

    // Use in-memory results if present; otherwise fall back to file-persisted results.
    let file_results;
    let results = if let Some(r) = workflow.results.get(story_id) {
        r
    } else {
        let project_root = ctx.state.get_project_root().ok();
        file_results = project_root.as_deref().and_then(|root| {
            crate::http::workflow::read_test_results_from_story_file(root, story_id)
        });
        file_results.as_ref().map_or_else(
            || {
                // No results anywhere — use empty default for the acceptance check
                // (it will fail with "No test results recorded")
                static EMPTY: std::sync::OnceLock<crate::workflow::StoryTestResults> =
                    std::sync::OnceLock::new();
                EMPTY.get_or_init(Default::default)
            },
            |r| r,
        )
    };

    let coverage = workflow.coverage.get(story_id);
    let decision = evaluate_acceptance_with_coverage(results, coverage);

    if decision.can_accept {
        Ok("Story can be accepted. All gates pass.".to_string())
    } else {
        let mut parts = decision.reasons;
        if let Some(w) = decision.warning {
            parts.push(w);
        }
        Err(format!("Acceptance blocked: {}", parts.join("; ")))
    }
}

pub(crate) fn tool_check_criterion(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 criterion_index = args
        .get("criterion_index")
        .and_then(|v| v.as_u64())
        .ok_or("Missing required argument: criterion_index")? as usize;

    let root = ctx.state.get_project_root()?;
    check_criterion_in_file(&root, story_id, criterion_index)?;

    Ok(format!(
        "Criterion {criterion_index} checked for story '{story_id}'. Committed to master."
    ))
}

pub(crate) fn tool_edit_criterion(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 criterion_index = args
        .get("criterion_index")
        .and_then(|v| v.as_u64())
        .ok_or("Missing required argument: criterion_index")? as usize;
    let new_text = args
        .get("new_text")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: new_text")?;

    let root = ctx.state.get_project_root()?;
    edit_criterion_in_file(&root, story_id, criterion_index, new_text)?;

    Ok(format!(
        "Criterion {criterion_index} updated for story '{story_id}'."
    ))
}

pub(crate) fn tool_add_criterion(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 criterion = args
        .get("criterion")
        .and_then(|v| v.as_str())
        .ok_or("Missing required argument: criterion")?;

    let root = ctx.state.get_project_root()?;
    add_criterion_to_file(&root, story_id, criterion)?;

    Ok(format!(
        "Added criterion to story '{story_id}': - [ ] {criterion}"
    ))
}

pub(crate) fn tool_remove_criterion(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 criterion_index = args
        .get("criterion_index")
        .and_then(|v| v.as_u64())
        .ok_or("Missing required argument: criterion_index")? as usize;

    let root = ctx.state.get_project_root()?;
    remove_criterion_from_file(&root, story_id, criterion_index)?;

    Ok(format!(
        "Removed criterion {criterion_index} from story '{story_id}'."
    ))
}

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

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

    #[test]
    fn parse_test_cases_empty() {
        let result = parse_test_cases(None).unwrap();
        assert!(result.is_empty());
    }

    #[test]
    fn parse_test_cases_valid() {
        let input = json!([
            {"name": "test1", "status": "pass"},
            {"name": "test2", "status": "fail", "details": "assertion failed"}
        ]);
        let result = parse_test_cases(Some(&input)).unwrap();
        assert_eq!(result.len(), 2);
        assert_eq!(result[0].status, TestStatus::Pass);
        assert_eq!(result[1].status, TestStatus::Fail);
        assert_eq!(result[1].details, Some("assertion failed".to_string()));
    }

    #[test]
    fn parse_test_cases_invalid_status() {
        let input = json!([{"name": "t", "status": "maybe"}]);
        assert!(parse_test_cases(Some(&input)).is_err());
    }

    #[test]
    fn parse_test_cases_null_value_returns_empty() {
        let null_val = json!(null);
        let result = parse_test_cases(Some(&null_val)).unwrap();
        assert!(result.is_empty());
    }

    #[test]
    fn parse_test_cases_non_array_returns_error() {
        let obj = json!({"invalid": "input"});
        let result = parse_test_cases(Some(&obj));
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("Expected array"));
    }

    #[test]
    fn parse_test_cases_missing_name_returns_error() {
        let input = json!([{"status": "pass"}]);
        let result = parse_test_cases(Some(&input));
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("name"));
    }

    #[test]
    fn parse_test_cases_missing_status_returns_error() {
        let input = json!([{"name": "test1"}]);
        let result = parse_test_cases(Some(&input));
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("status"));
    }

    #[test]
    fn tool_get_story_todos_missing_file() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_get_story_todos(&json!({"story_id": "99_nonexistent"}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("not found"));
    }

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

        crate::db::ensure_content_store();
        crate::db::write_item_with_content(
            "9901_test",
            "2_current",
            "---\nname: Test\n---\n## AC\n- [ ] First\n- [x] Done\n- [ ] Second\n",
        );

        let ctx = test_ctx(tmp.path());
        let result = tool_get_story_todos(&json!({"story_id": "9901_test"}), &ctx).unwrap();
        let parsed: Value = serde_json::from_str(&result).unwrap();
        assert_eq!(parsed["todos"].as_array().unwrap().len(), 2);
        assert_eq!(parsed["story_name"], "Test");
    }

    #[test]
    fn tool_record_tests_and_ensure_acceptance() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());

        // Record passing tests
        let result = tool_record_tests(
            &json!({
                "story_id": "1_test",
                "unit": [{"name": "u1", "status": "pass"}],
                "integration": [{"name": "i1", "status": "pass"}]
            }),
            &ctx,
        )
        .unwrap();
        assert!(result.contains("recorded"));

        // Should be acceptable
        let result = tool_ensure_acceptance(&json!({"story_id": "1_test"}), &ctx).unwrap();
        assert!(result.contains("All gates pass"));
    }

    #[test]
    fn tool_ensure_acceptance_blocks_on_failures() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());

        tool_record_tests(
            &json!({
                "story_id": "1_test",
                "unit": [{"name": "u1", "status": "fail"}],
                "integration": []
            }),
            &ctx,
        )
        .unwrap();

        let result = tool_ensure_acceptance(&json!({"story_id": "1_test"}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("blocked"));
    }

    #[test]
    fn tool_record_tests_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_record_tests(&json!({"unit": [], "integration": []}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[test]
    fn tool_record_tests_invalid_unit_type_returns_error() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_record_tests(
            &json!({
                "story_id": "1_test",
                "unit": "not_an_array",
                "integration": []
            }),
            &ctx,
        );
        assert!(result.is_err());
    }

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

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

        crate::db::ensure_content_store();
        crate::db::write_item_with_content(
            "9906_story_persist",
            "2_current",
            "---\nname: Persist\n---\n# Story\n",
        );

        let ctx = test_ctx(tmp.path());
        tool_record_tests(
            &json!({
                "story_id": "9906_story_persist",
                "unit": [{"name": "u1", "status": "pass"}],
                "integration": []
            }),
            &ctx,
        )
        .unwrap();

        let contents = crate::db::read_content("9906_story_persist")
            .expect("story content should exist in CRDT");
        assert!(
            contents.contains("## Test Results"),
            "content should have Test Results section"
        );
        assert!(
            contents.contains("huskies-test-results:"),
            "content should have JSON marker"
        );
        assert!(contents.contains("u1"), "content should contain test name");
    }

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

        // Write story content to CRDT with a pre-populated Test Results section
        let story_content = "---\nname: Persist\n---\n# Story\n\n## Test Results\n\n<!-- huskies-test-results: {\"unit\":[{\"name\":\"u1\",\"status\":\"pass\",\"details\":null}],\"integration\":[{\"name\":\"i1\",\"status\":\"pass\",\"details\":null}]} -->\n";
        crate::db::ensure_content_store();
        crate::db::write_item_with_content("9905_story_file_only", "2_current", story_content);

        let ctx = test_ctx(tmp.path());

        // ensure_acceptance should read from content store and succeed
        let result = tool_ensure_acceptance(&json!({"story_id": "9905_story_file_only"}), &ctx);
        assert!(
            result.is_ok(),
            "should accept based on content store data, got: {:?}",
            result
        );
        assert!(result.unwrap().contains("All gates pass"));
    }

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

        let story_content = "---\nname: Fail\n---\n# Story\n\n## Test Results\n\n<!-- huskies-test-results: {\"unit\":[{\"name\":\"u1\",\"status\":\"fail\",\"details\":\"error\"}],\"integration\":[]} -->\n";
        fs::write(current.join("3_story_fail.md"), story_content).unwrap();

        let ctx = test_ctx(tmp.path());
        let result = tool_ensure_acceptance(&json!({"story_id": "3_story_fail"}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("blocked"));
    }

    #[test]
    fn tool_check_criterion_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_check_criterion(&json!({"criterion_index": 0}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[test]
    fn tool_check_criterion_missing_criterion_index() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_check_criterion(&json!({"story_id": "1_test"}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("criterion_index"));
    }

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

        crate::db::ensure_content_store();
        crate::db::write_item_with_content(
            "9904_test",
            "2_current",
            "---\nname: Test\n---\n## AC\n- [ ] First criterion\n- [x] Already done\n",
        );

        let ctx = test_ctx(tmp.path());
        let result = tool_check_criterion(
            &json!({"story_id": "9904_test", "criterion_index": 0}),
            &ctx,
        );
        assert!(result.is_ok(), "Expected ok: {result:?}");
        assert!(result.unwrap().contains("Criterion 0 checked"));
    }

    #[test]
    fn tool_remove_criterion_missing_story_id() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_remove_criterion(&json!({"criterion_index": 0}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("story_id"));
    }

    #[test]
    fn tool_remove_criterion_missing_criterion_index() {
        let tmp = tempfile::tempdir().unwrap();
        let ctx = test_ctx(tmp.path());
        let result = tool_remove_criterion(&json!({"story_id": "1_test"}), &ctx);
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("criterion_index"));
    }

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

        crate::db::ensure_content_store();
        crate::db::write_item_with_content(
            "9905_test",
            "2_current",
            "---\nname: Test\n---\n## Acceptance Criteria\n- [ ] Keep me\n- [ ] Remove me\n",
        );

        let ctx = test_ctx(tmp.path());
        let result = tool_remove_criterion(
            &json!({"story_id": "9905_test", "criterion_index": 1}),
            &ctx,
        );
        assert!(result.is_ok(), "Expected ok: {result:?}");
        assert!(result.unwrap().contains("Removed criterion 1"));
    }

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

        crate::db::ensure_content_store();
        crate::db::write_item_with_content(
            "9906_test",
            "2_current",
            "---\nname: Test\n---\n## Acceptance Criteria\n- [ ] Only one\n",
        );

        let ctx = test_ctx(tmp.path());
        let result = tool_remove_criterion(
            &json!({"story_id": "9906_test", "criterion_index": 5}),
            &ctx,
        );
        assert!(result.is_err());
        assert!(result.unwrap_err().contains("out of range"));
    }
}