//! Tracking API endpoints for project change logs and TODOs
//!
//! Integrates vapora-tracking system with the main backend API,
//! providing unified access to project tracking data.

use axum::{extract::Query, http::StatusCode, routing::get, Json, Router};
use serde::{Deserialize, Serialize};
use serde_json::json;
use tracing::info;

/// Query parameters for filtering tracking entries
#[derive(Debug, Deserialize, Serialize)]
pub struct TrackingFilter {
    /// Filter by project path
    pub project: Option<String>,
    /// Filter by source type
    pub source: Option<String>,
    /// Limit number of results
    pub limit: Option<usize>,
}

/// Initialize tracking routes for the API
///
/// # Arguments
///
/// * `db` - Shared TrackingDb instance
///
/// # Returns
///
/// Router configured with tracking endpoints
#[allow(dead_code)]
pub fn setup_tracking_routes() -> Router {
    Router::new()
        .route("/tracking/entries", get(list_tracking_entries))
        .route("/tracking/summary", get(get_tracking_summary))
        .route("/tracking/health", get(tracking_health))
}

/// List all tracking entries with optional filtering
///
/// # Query Parameters
///
/// * `project` - Filter by project path
/// * `source` - Filter by source type
/// * `limit` - Limit results (default: 100)
///
/// # Examples
///
/// `GET /api/v1/tracking/entries?project=/myproject&limit=50`
pub async fn list_tracking_entries(
    Query(filter): Query<TrackingFilter>,
) -> Result<Json<serde_json::Value>, StatusCode> {
    info!("Getting tracking entries with filter: {:?}", filter);

    // TODO: Implement actual query using filter parameters
    // For now, return placeholder response
    let response = json!({
        "items": [],
        "count": 0,
        "filter": filter
    });

    Ok(Json(response))
}

/// Get tracking summary statistics
///
/// # Examples
///
/// `GET /api/v1/tracking/summary`
pub async fn get_tracking_summary() -> Result<Json<serde_json::Value>, StatusCode> {
    info!("Getting tracking summary");

    let summary = json!({
        "total_entries": 0,
        "change_count": 0,
        "todo_count": 0,
        "todos_by_status": {
            "pending": 0,
            "in_progress": 0,
            "completed": 0,
            "blocked": 0
        },
        "last_sync": chrono::Utc::now().to_rfc3339()
    });

    Ok(Json(summary))
}

/// Health check for tracking service
///
/// # Examples
///
/// `GET /api/v1/tracking/health`
pub async fn tracking_health() -> Result<Json<serde_json::Value>, StatusCode> {
    info!("Tracking service health check");

    let response = json!({
        "status": "ok",
        "service": "vapora-tracking",
        "timestamp": chrono::Utc::now().to_rfc3339()
    });

    Ok(Json(response))
}

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

    #[test]
    fn test_tracking_filter_deserialization() {
        let json = r#"{"project": "/test", "limit": 50}"#;
        let filter: TrackingFilter = serde_json::from_str(json).unwrap();
        assert_eq!(filter.project, Some("/test".to_string()));
        assert_eq!(filter.limit, Some(50));
    }
}
