/* eslint-disable @typescript-eslint/no-unused-vars */
import { Injectable } from '@angular/core';
import { parse } from 'iptv-playlist-parser';
import { NgxIndexedDBService } from 'ngx-indexed-db';
import { combineLatest, map, Observable, switchMap } from 'rxjs';
import { Channel } from '../../../shared/channel.interface';
import { GLOBAL_FAVORITES_PLAYLIST_ID } from '../../../shared/constants';
import {
    Playlist,
    PlaylistUpdateState,
} from '../../../shared/playlist.interface';
import {
    aggregateFavoriteChannels,
    createFavoritesPlaylist,
    createPlaylistObject,
} from '../../../shared/playlist.utils';
import { DbStores } from '../indexed-db.config';
import { PlaylistMeta } from '../shared/playlist-meta.type';

@Injectable({
    providedIn: 'root',
})
export class PlaylistsService {
    constructor(private dbService: NgxIndexedDBService) {}

    getAllPlaylists() {
        return this.dbService.getAll<Playlist>(DbStores.Playlists).pipe(
            map((data) =>
                data.map(({ playlist, items, header, ...rest }) => ({
                    ...rest,
                }))
            ),
            map((playlists) =>
                playlists.sort((a, b) => a.position - b.position)
            )
        );
    }

    addPlaylist(playlist) {
        return this.dbService.add(DbStores.Playlists, playlist);
    }

    getPlaylistChannels(id: string) {
        let playlist$: Observable<Partial<Playlist>>;
        if (id === GLOBAL_FAVORITES_PLAYLIST_ID) {
            playlist$ = this.getPlaylistWithGlobalFavorites();
        } else {
            playlist$ = this.dbService.getByID<Playlist>(
                DbStores.Playlists,
                id
            );
        }
        return playlist$.pipe(
            map((data: Playlist) => data.playlist.items as Channel[])
        );
    }

    deletePlaylist(playlistId: string) {
        return this.dbService.delete(DbStores.Playlists, playlistId);
    }

    updatePlaylist(playlistId: string, updatedPlaylist: Playlist) {
        return this.getPlaylistById(playlistId).pipe(
            switchMap((currentPlaylist: Playlist) =>
                this.dbService.update(DbStores.Playlists, {
                    ...currentPlaylist,
                    ...updatedPlaylist,
                    count: updatedPlaylist.playlist.items.length,
                    updateDate: Date.now(),
                    updateState: PlaylistUpdateState.UPDATED,
                })
            )
        );
    }

    getPlaylistById(id: string) {
        return this.dbService.getByID<Playlist>(DbStores.Playlists, id);
    }

    updatePlaylistMeta(updatedPlaylist: PlaylistMeta) {
        return this.getPlaylistById(updatedPlaylist._id).pipe(
            switchMap((playlist) =>
                this.dbService.update(DbStores.Playlists, {
                    ...playlist,
                    title: updatedPlaylist.title,
                    autoRefresh: updatedPlaylist.autoRefresh,
                })
            )
        );
    }

    updateFavorites(id: string, favorites: string[]) {
        return this.getPlaylistById(id).pipe(
            switchMap((playlist) =>
                this.dbService.update(DbStores.Playlists, {
                    ...playlist,
                    favorites,
                })
            )
        );
    }

    updateManyPlaylists(playlists: Playlist[]) {
        return combineLatest(
            playlists.map((playlist) => {
                return this.dbService.update(DbStores.Playlists, {
                    ...playlist,
                    updateDate: Date.now(),
                    autoRefresh: true,
                });
            })
        );
    }

    getFavoriteChannels(playlistId: string) {
        return this.dbService
            .getByID<Playlist>(DbStores.Playlists, playlistId)
            .pipe(
                map((data) =>
                    data.playlist.items.filter((channel) =>
                        data.favorites.includes((channel as Channel).id)
                    )
                )
            );
    }

    updatePlaylistPositions(
        positionUpdates: {
            id: string;
            changes: { position: number };
        }[]
    ) {
        return combineLatest(
            positionUpdates.map((item, index) => {
                return this.dbService.getByID(DbStores.Playlists, item.id).pipe(
                    switchMap((playlist: Playlist) =>
                        this.dbService.update(DbStores.Playlists, {
                            ...playlist,
                            position: item.changes.position,
                        })
                    )
                );
            })
        );
    }

    handlePlaylistParsing(
        uploadType: 'FILE' | 'URL' | 'TEXT',
        playlist: string,
        title: string,
        path?: string
    ) {
        const parsedPlaylist = parse(playlist);
        return createPlaylistObject(title, parsedPlaylist, path, uploadType);
    }

    getPlaylistWithGlobalFavorites() {
        return this.dbService.getAll(DbStores.Playlists).pipe(
            map((playlists: Playlist[]) => {
                const favoriteChannels = aggregateFavoriteChannels(playlists);
                const favPlaylist = createFavoritesPlaylist(favoriteChannels);
                return favPlaylist;
            })
        );
    }

    addManyPlaylists(playlists: Playlist[]) {
        return this.dbService.bulkAdd(DbStores.Playlists, playlists as any); // TODO: update ngx-indexed-db
    }

    getPlaylistsForAutoUpdate() {
        return this.dbService.getAll(DbStores.Playlists).pipe(
            map((playlists: Playlist[]) => {
                return playlists
                    .filter((item) => item.autoRefresh)
                    .map(
                        ({ playlist, header, items, favorites, ...rest }) =>
                            rest
                    );
            })
        );
    }

    setFavorites(playlistId: string, favorites: string[]) {
        return this.getPlaylistById(playlistId).pipe(
            switchMap((playlist) =>
                this.dbService.update(DbStores.Playlists, {
                    ...playlist,
                    favorites,
                })
            )
        );
    }
}