3RESIT/backend/app/controllers/search.controller.js

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

export async function search(req, res) {
    try {
        
        const query = req.query.q;
        const type = req.query.type || 'all';
        const offset = parseInt(req.query.offset) || 0;
        const limit = parseInt(req.query.limit) || 20;
        const client = await getClient();


        if (!query) {
            return res.status(400).json({ message: "Query parameter 'q' is required" });
        }

        if (type === 'videos') {
            let videoResults = [];

            const videoNameQuery = `
                SELECT
                    v.id, v.title, v.thumbnail, v.description as video_description, v.channel, v.visibility, v.file, v.slug, v.format, v.release_date,
                    c.id as channel_id, c.owner, c.description as channel_description, c.name,
                    u.picture as profilePicture,
                    COUNT(h.id) as views
                FROM videos as v
                         JOIN public.channels c on v.channel = c.id
                         JOIN public.users u on c.owner = u.id
                         LEFT JOIN public.history h on h.video = v.id
                WHERE v.title ILIKE $1 AND v.visibility = 'public'
                GROUP BY v.id, v.title, v.thumbnail, v.description, v.channel, v.visibility, v.file, v.slug, v.format, v.release_date,
                         c.id, c.owner, c.description, c.name, u.picture
                OFFSET $2
                LIMIT $3;
            `;

            const videoNameResult = await client.query(videoNameQuery, [`%${query}%`, offset, limit]);
            const videoNames = videoNameResult.rows;

            for (const video of videoNames) {
                video.creator = {
                    name: video.name,
                    profilePicture: video.profilepicture,
                    description: video.channel_description
                };
                delete video.name;
                delete video.profilepicture;
                delete video.channel_description;

                video.type = "video";
                videoResults.push(video);
            }

            client.release()

            return res.status(200).json(videoResults);

        } else if (type === 'channel') {
            let channelResults = [];

            const channelNameQuery = `
                SELECT c.id as channel_id, c.name, c.description as channel_description, c.owner, u.picture as profilePicture, COUNT(s.id) as subscribers
                FROM public.channels c
                    JOIN public.users u on c.owner = u.id
                    LEFT JOIN public.subscriptions s ON s.channel = c.id
                WHERE c.name ILIKE $1
                group by c.name, c.id, c.description, c.owner, u.picture
                OFFSET $2
                LIMIT $3;
            `;

            const channelNameResult = await client.query(channelNameQuery, [`%${query}%`, offset, limit]);
            const channelNames = channelNameResult.rows;

            for (const channel of channelNames) {
                channel.type = "channel";
                channel.profilePicture = channel.profilepicture;
                delete channel.profilepicture;
                channelResults.push(channel);
            }

            client.release()

            return res.status(200).json(channelResults);

        } else {
            return res.status(400).json({ message: "Invalid type parameter. Use 'videos' or 'channel'." });
        }


    } catch (error) {
        console.error("Error in search controller:", error);
        res.status(500).json({ message: "Internal server error" });
    }
}