import { v4 as uuidv4 } from 'uuid';
import { ParsedPlaylist } from '../src/typings';
import { Channel } from './channel.interface';
import { GLOBAL_FAVORITES_PLAYLIST_ID } from './constants';
import { Playlist } from './playlist.interface';

/**
 * Aggregates favorite channels as objects from all available playlists
 * @param playlists all available playlists
 * @returns an array with favorite channels from all playlists
 */
export function aggregateFavoriteChannels(playlists: Playlist[]): Channel[] {
    const favorites = [];
    playlists.forEach((playlist) => {
        if (playlist.favorites?.length > 0) {
            playlist.playlist.items.forEach((channel) => {
                if (
                    playlist.favorites.includes(channel.id) ||
                    playlist.favorites.includes(channel.url)
                ) {
                    favorites.push(channel);
                }
            });
        }
    });
    return favorites;
}

/**
 * Creates a simplified playlist object which is used for global favorites
 * @param channels channels list
 * @returns simplified playlist object
 */
export function createFavoritesPlaylist(
    channels: Channel[]
): Partial<Playlist> {
    return {
        _id: GLOBAL_FAVORITES_PLAYLIST_ID,
        count: channels.length,
        playlist: {
            items: channels,
        },
        filename: 'Global favorites',
    };
}

/**
 * Returns last segment (part after last slash "/") of the given URL
 * @param value URL as string
 */
export const getFilenameFromUrl = (value: string): string => {
    if (value && value.length > 1) {
        return value.substring(value.lastIndexOf('/') + 1);
    }
    return 'Untitled playlist';
};

/**
 * Creates a playlist object
 * @param name name of the playlist
 * @param playlist playlist to save
 * @param urlOrPath absolute fs path or url of the playlist
 * @param uploadType upload type - by file or via an url
 */
export const createPlaylistObject = (
    name: string,
    playlist: ParsedPlaylist,
    urlOrPath?: string,
    uploadType?: 'URL' | 'FILE' | 'TEXT'
): Playlist => {
    return {
        _id: uuidv4(),
        filename: name,
        title: name,
        count: playlist.items.length,
        playlist: {
            ...playlist,
            items: playlist.items.map((item) => ({
                id: uuidv4(),
                ...item,
            })),
        },
        importDate: new Date().toISOString(),
        lastUsage: new Date().toISOString(),
        favorites: [],
        autoRefresh: false,
        ...(uploadType === 'URL' ? { url: urlOrPath } : {}),
        ...(uploadType === 'FILE' ? { filePath: urlOrPath } : {}),
    };
};