import Video from '../models/Video.js';
import Playlist from '../models/Playlist.js';
import Artist from '../models/Artist.js';
import ApiError from '../controllers/ErrorController.js';
import storage from '../config/storage.js';
import uploadVideo from "../utils/uploadVideo.js";

class VideoService {
    async create({name, videoHQ, videoLQ, playlist, artist}) {

        if(!videoHQ && !videoLQ) {
            throw ApiError.BadRequest('Видео не загружены');
        }
        if(videoHQ?.mimetype.indexOf('video') === -1 || videoLQ?.mimetype.indexOf('video') === -1) {
            throw ApiError.BadRequest('К загрузке принимаются только видео.');
        }
        const getArtist = await Artist.findById(artist);
        if(!getArtist) {
            throw ApiError.BadRequest('Такого исполнителя не существует'); 
        }
        if(playlist) {
            const getPlaylist = await Playlist.findById(playlist);
            if(!getPlaylist) {
                throw ApiError.BadRequest('Такого плейлиста не существует'); 
            }
        }

        const videoHQLink = await uploadVideo(videoHQ);
        const videoLQLink = await uploadVideo(videoLQ);

        const video = await Video.create({name, videoHQ: videoHQLink.Location, videoLQ: videoLQLink.Location, playlist, artist, date: new Date()});

        return {video};
    }
    
    async getAll({page, search}) {
        const limit = page ? 10 : 0;

        const videos = await Video.find({name: {$regex: search || '', $options: 'i'}}).populate([{ path: 'artist', select: 'name' }, { path: 'playlist', select: 'name' }]).skip(page * limit).limit(limit).sort({_id: -1});
        const count = await Video.countDocuments({name: {$regex: search || '', $options: 'i'}});
        
        return {videos, count: Math.ceil(count/limit)};
    }

    async getOne() {
        const video = await Video.aggregate([
            { $sample: { size: 1 } },
            {
                $lookup:
                {
                    from: 'artists',
                    localField: 'artist',
                    foreignField: '_id',
                    as : "artist"
                },
            },
            {
                $lookup:
                {
                    from: 'playlists',
                    localField: 'playlist',
                    foreignField: '_id',
                    as : "playlist"
                },
            },
        ]);
        if(!video) {
            throw ApiError.BadRequest('Видео не существует'); 
        }

        const oneVideo = video[0];

        return {video: oneVideo};
    }
    async edit({id, name, videoHQ, videoLQ, playlist, artist}) {
        
        if(artist) {
            const getArtist = await Artist.findById(artist);
            if(!getArtist) {
                throw ApiError.BadRequest('Такого исполнителя не существует'); 
            }
        }

        if(playlist) {
            const getPlaylist = await Playlist.findById(playlist);
            if(!getPlaylist) {
                throw ApiError.BadRequest('Такого плейлиста не существует'); 
            }
        }
        
        const video = await Video.findByIdAndUpdate(id, {name, playlist, artist}, {returnOriginal: false});
        if(!video) {
            throw ApiError.BadRequest('Видео не существует'); 
        }
        
        return {video};
    }

    async delete({id}) {
        const video = await Video.findByIdAndDelete(id).select(['login']);
        if(!video) {
            throw ApiError.BadRequest('Видео не существует'); 
        }

        return {video};
    }
}

export default new VideoService();