import {getClient} from "../utils/database.js";


export async function getRecommendations(req, res) {

    const token = req.headers.authorization?.split(' ')[1];

    if (!token) {

        // GET MOST USED TOKEN
        let client = await getClient();
        let queryMostUsedToken = `SELECT id, name FROM tags ORDER BY usage_count DESC LIMIT 3;`;
        let result = await client.query(queryMostUsedToken);

        const recommendations = result.rows;
        res.status(200).json(recommendations);

    } else {

        // Recuperer les 20 derniere vu de l'historique
        let client = await getClient();
        let queryLastVideos = `SELECT video_id FROM history WHERE user_id = $1 ORDER BY viewed_at DESC LIMIT 20;`;
        // TODO: Implement retrieval of recommendations based on user history and interactions

        // Recuperer les likes de l'utilisateur sur les 20 derniere videos recuperees

        // Recuperer les commentaires de l'utilisateur sur les 20 derniere videos recuperees

        // Recuperer les 3 tags avec lesquels l'utilisateur a le plus interagi

        // Recuperer 10 videos avec les 3 tags ayant le plus d'interaction avec l'utilisateur

        res.status(200).json({
            message: "Recommendations based on user history and interactions are not yet implemented."
        });
    }

}

export async function getTrendingVideos(req, res) {
    try {
        // GET 10 VIDEOS WITH THE MOST LIKES AND COMMENTS
        let client = await getClient();
        let queryTrendingVideos = `
        SELECT v.id, v.title, v.description, v.release_date, v.thumbnail, 
               COUNT(DISTINCT l.id) AS like_count, COUNT(DISTINCT c.id) AS comment_count
        FROM videos v
        LEFT JOIN likes l ON v.id = l.video
        LEFT JOIN comments c ON v.id = c.video
        GROUP BY v.id
        ORDER BY like_count DESC, comment_count DESC
        LIMIT 10;
    `;
        let result = await client.query(queryTrendingVideos);
        const trendingVideos = result.rows;

        for (let video of trendingVideos) {
            // Get the number of views for each video
            let viewsQuery = `SELECT COUNT(*) AS view_count FROM history WHERE video = $1;`;
            let viewsResult = await client.query(viewsQuery, [video.id]);
            video.views = viewsResult.rows[0].view_count;

            // Get the creator of each video
            let creatorQuery = `SELECT c.id, c.name FROM channels c JOIN videos v ON c.id = v.channel WHERE v.id = $1;`;
            let creatorResult = await client.query(creatorQuery, [video.id]);
            if (creatorResult.rows.length > 0) {
                video.creator = creatorResult.rows[0];
            } else {
                video.creator = {id: null, name: "Unknown"};
            }

            // GET THE PROFILE PICTURE OF THE CREATOR
            let profilePictureQuery = `SELECT u.picture FROM users u JOIN channels c ON u.id = c.owner WHERE c.id = $1;`;
            let profilePictureResult = await client.query(profilePictureQuery, [video.creator.id]);
            if (profilePictureResult.rows.length > 0) {
                video.creator.profilePicture = profilePictureResult.rows[0].picture;
            } else {
                video.creator.profilePicture = null; // Default or placeholder image can be set here
            }

        }

        res.status(200).json(trendingVideos);
    } catch (error) {
        console.error("Error fetching trending videos:", error);
        res.status(500).json({error: "Internal server error while fetching trending videos."});
    }
}