use crate::config::ProjectConfig;
use std::path::{Path, PathBuf};

use super::AgentPool;

impl AgentPool {
    /// Create a worktree for the given story using the server port (writes .mcp.json).
    pub async fn create_worktree(
        &self,
        project_root: &Path,
        story_id: &str,
    ) -> Result<crate::worktree::WorktreeInfo, String> {
        let config = ProjectConfig::load(project_root)?;
        crate::worktree::create_worktree(project_root, story_id, &config, self.port).await
    }

    /// Get project root helper.
    pub fn get_project_root(&self, state: &crate::state::SessionState) -> Result<PathBuf, String> {
        state.get_project_root()
    }
}

/// Return the active pipeline stage directory name for `story_id`, or `None` if the
/// story is not in any active stage (`2_current/`, `3_qa/`, `4_merge/`).
pub(super) fn find_active_story_stage(project_root: &Path, story_id: &str) -> Option<&'static str> {
    const STAGES: [&str; 3] = ["2_current", "3_qa", "4_merge"];

    // Try CRDT first — primary source of truth.
    if let Some(item) = crate::crdt_state::read_item(story_id) {
        for stage in &STAGES {
            if item.stage == *stage {
                return Some(stage);
            }
        }
    }

    // Also check filesystem (backwards compat / tests).
    for stage in &STAGES {
        let path = project_root
            .join(".huskies")
            .join("work")
            .join(stage)
            .join(format!("{story_id}.md"));
        if path.exists() {
            return Some(stage);
        }
    }
    None
}

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

    #[test]
    fn find_active_story_stage_detects_current() {
        use std::fs;
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path();
        let current = root.join(".huskies/work/2_current");
        fs::create_dir_all(&current).unwrap();
        fs::write(current.join("10_story_test.md"), "test").unwrap();

        assert_eq!(
            find_active_story_stage(root, "10_story_test"),
            Some("2_current")
        );
    }

    #[test]
    fn find_active_story_stage_detects_qa() {
        use std::fs;
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path();
        let qa = root.join(".huskies/work/3_qa");
        fs::create_dir_all(&qa).unwrap();
        fs::write(qa.join("11_story_test.md"), "test").unwrap();

        assert_eq!(find_active_story_stage(root, "11_story_test"), Some("3_qa"));
    }

    #[test]
    fn find_active_story_stage_detects_merge() {
        use std::fs;
        let tmp = tempfile::tempdir().unwrap();
        let root = tmp.path();
        let merge = root.join(".huskies/work/4_merge");
        fs::create_dir_all(&merge).unwrap();
        fs::write(merge.join("12_story_test.md"), "test").unwrap();

        assert_eq!(
            find_active_story_stage(root, "12_story_test"),
            Some("4_merge")
        );
    }

    #[test]
    fn find_active_story_stage_returns_none_for_unknown_story() {
        let tmp = tempfile::tempdir().unwrap();
        assert_eq!(find_active_story_stage(tmp.path(), "99_nonexistent"), None);
    }
}