import { Interfaces as Notifications } from '@dbus-types/notifications'
import dayjs from "dayjs";
import { DBusInterface, MessageBus, sessionBus, Connection, ConnectOpts } from 'dbus-ts';
import EventEmitter from "events";
import { PlayObject, PlayObjectLifecycleless } from "../../core/Atomic.js";
import { FormatPlayObjectOptions, InternalConfig } from "../common/infrastructure/Atomic.js";
import {
    MPRIS_IFACE,
    MPRIS_PATH,
    MPRISMetadata,
    MPRISSourceConfig,
    PLAYBACK_STATUS_STOPPED,
    PlaybackStatus,
    PlayerInfo,
} from "../common/infrastructure/config/source/mpris.js";
import { removeDuplicates } from "../utils.js";
import { findCauseByMessage } from "../utils/ErrorUtils.js";
import { RecentlyPlayedOptions } from "./AbstractSource.js";
import MemorySource from "./MemorySource.js";
import { Readable, Writable } from 'stream';
import net from 'net';
import pEvent from 'p-event';
import { baseFormatPlayObj } from '../utils/PlayTransformUtils.js';
import { artistNamesToCredits } from '../../core/StringUtils.js';


export class MPRISSource extends MemorySource {

    declare config: MPRISSourceConfig;

    whitelist: string[] = [];
    blacklist: string[] = [];

    multiPlatform: boolean = true;

    constructor(name: any, config: MPRISSourceConfig, internal: InternalConfig, emitter: EventEmitter) {
        super('mpris', name, config, internal, emitter);
        this.canPoll = true;

        const {data: {whitelist = [], blacklist = []} = {}} = config;
        if(!Array.isArray(whitelist)) {
            this.whitelist = whitelist.split(',')
        } else {
            this.whitelist = whitelist;
        }
        if(!Array.isArray(blacklist)) {
            this.blacklist = blacklist.split(',');
        } else {
            this.blacklist = blacklist;
        }
    }

    static formatPlayObj(obj: PlayerInfo, options: FormatPlayObjectOptions = {}): PlayObject {
        const {newFromSource = false} = options;
        const {
            name,
            position,
            metadata: {
                length,
                album,
                artist = [],
                albumArtist = [],
                title,
                trackid,
                url,
            } = {}
        } = obj;

        let actualAlbumArtists: string[] = [];
        if(albumArtist.filter(x => !artist.includes(x)).length > 0) {
            // only include album artists if they are not the EXACT same as the track artists
            // ...if they aren't the exact same then include all artists, even if they are duplicates of track artists
            actualAlbumArtists = albumArtist;
        }

        const play: PlayObjectLifecycleless = {
            data: {
                track: title,
                album,
                artists: artistNamesToCredits(artist),
                albumArtists:artistNamesToCredits(actualAlbumArtists),
                duration: length,
                playDate: dayjs()
            },
            meta: {
                source: 'mpris',
                trackId: trackid,
                newFromSource,
                url: {
                    web: url
                },
                trackProgressPosition: position,
                deviceId: name,
            }
        }
        return baseFormatPlayObj(obj, play);
    }

    protected async doCheckConnection(): Promise<true | string | undefined> {
        // test if we can get DBus
        try {
            await this.getDBus();
            return true;
        } catch (e) {
            throw new Error('Could not get DBus interface from operating system', {cause: e});
        }
    }

    protected getDBus = async () => {
        const conn = new Connection(createStream({}));
        try {
            const res = await Promise.race([
                pEvent(conn, 'error'),
                conn.init()
            ])
            if(res instanceof Error) {
                throw res;
            }
        } catch (e) {
            throw new Error('Failed to connected to session bus', {cause: e});
        }

        try {
            const promise = sessionBus<Notifications>();
            const busNew = await sessionBus<Notifications>();
            return await busNew.getInterface('org.freedesktop.DBus', '/org/freedesktop/DBus', 'org.freedesktop.DBus');
        } catch (e) {
            throw new Error('Failed to get DBus interface', {cause: e});
        } 
    }

    protected listNew = async () => {
        const iface = await this.getDBus();
        const names = (await iface.ListNames())[0];
        return names.filter((n) => n.includes('org.mpris.MediaPlayer2'))
    }

    getPlayersInfo = async (activeOnly = true): Promise<PlayerInfo[]> => {

        const busNew = await sessionBus<Notifications>();

        const playerInfos: PlayerInfo[] = [];

        const newList = await this.listNew();

        for (const playerName of newList) {
            const plainPlayerName = playerName.replace('org.mpris.MediaPlayer2.', '');
            try {
                const props = await busNew.getInterface(playerName, MPRIS_PATH, MPRIS_IFACE);
                // may not always have position available! can fallback to undefined for this
                let pos: number | undefined;
                try {
                    pos = await this.getPlayerPosition(props);
                } catch (e) {
                    // only log if the error is not related to position not being supported since this is a potentially expected result
                    if(!findCauseByMessage(e, 'Position is not supported')) {
                        this.logger.warn(new Error(`Could not get Position info for player ${plainPlayerName}`, {cause: e}));
                    }
                }
                const status = await this.getPlayerStatus(props);
                if (status === PLAYBACK_STATUS_STOPPED && activeOnly) {
                    continue;
                }
                const metadata = await this.getPlayerMetadata(props);
                playerInfos.push({
                    name: plainPlayerName,
                    status,
                    position: pos,
                    metadata
                });
            } catch (e) {
                this.logger.warn(new Error(`Could not parse D-bus info for player ${plainPlayerName}`, {cause: convertDBusExceptionToError(e)}));
            }

        }

        return playerInfos;
    }

    protected getPlayerPosition = async (props: DBusInterface): Promise<number> => {
        try {
            const pos = await props['Position'];
            // microseconds
            return dayjs.duration({milliseconds: Number(pos / 1000)}).asSeconds();
        } catch(e) {
            throw new Error('Could not get player Position', {cause: convertDBusExceptionToError(e)});
        }
    }

    protected getPlayerStatus = async (props: DBusInterface): Promise<PlaybackStatus> => {
        try {
            const status = await props['PlaybackStatus'];
            return status as PlaybackStatus;
        } catch (e) {
            throw new Error('Could not get player PlaybackStatus', {cause: convertDBusExceptionToError(e)})
        }
    }

    protected getPlayerMetadata = async (props: DBusInterface): Promise<MPRISMetadata> => {
        try {
            const metadata = await props['Metadata'];
            return this.metadataToPlain(metadata);
        } catch(e) {
            throw new Error('Could not get player Metadata', {cause: convertDBusExceptionToError(e)});
        }
    }

    metadataToPlain = (metadataVariant): MPRISMetadata => {
        const metadataPlain = {};
        for (const k of Object.keys(metadataVariant)) {
            const value = metadataVariant[k];
            if (value === undefined || value === null) {
                //logging.warn(`ignoring a null metadata value for key ${k}`);
                continue;
            }
            const plainKey = k.replace(/mpris:|xesam:/, '');
            if(plainKey === 'length' && typeof value === 'number') {
                // microseconds to seconds
                metadataPlain[plainKey] = value / 1000000
            } else {
                metadataPlain[plainKey] = value;
            }
        }
        return metadataPlain;
    }

    getRecentlyPlayed = async (options: RecentlyPlayedOptions = {}) => {
        const infos = await this.getPlayersInfo();
        const plays: PlayObject[] = [];
        for(const info of infos) {
            const lowerName = info.name.toLocaleLowerCase();
            if(this.whitelist.length > 0) {
                if(!this.whitelist.some(x => lowerName.includes(x.toLocaleLowerCase()))) {
                    this.logger.debug(`No name in whitelist was found in Player Name '${info.name}', skipping player`);
                    continue;
                }
            } else if(this.blacklist.length > 0) {
                if(this.whitelist.some(x => lowerName.includes(x.toLocaleLowerCase()))) {
                    this.logger.debug(`A name in blacklist was found in Player Name '${info.name}', skipping player`);
                    continue;
                }
            }
            plays.push(MPRISSource.formatPlayObj(info));
        }
        const deduped = removeDuplicates(plays);
        if(options.display === true) {
            return deduped;
        }
        return await this.processRecentPlays(deduped);
    }
}

const convertDBusExceptionToError = (e: any): Error => {
    let err: Error;
    if(e instanceof Error) {
        err = e;
    } else if(Array.isArray(e)) {
        err = new Error(e.map(x => x.toString()).join(' | '));
    } else {
        err = new Error(e.toString());
    }
    return err;
}

// unfortunately had to recreate this function from dbus-ts/Connection
// in order to be able to create the Connection class without immediate init
// so we can catch errors
const createStream = (opts: ConnectOpts): Readable&Writable => {
    if (typeof opts !== 'object') {
        opts = {};
    }
    if ("stream" in opts) {
        return opts.stream;
    }
    if ("socket" in opts) {
        return net.createConnection(opts.socket);
    }
    if ("port" in opts) {
        return net.createConnection(opts.port, opts.host);
    }

    const busAddress = opts.busAddress || process.env.DBUS_SESSION_BUS_ADDRESS;
    if (!busAddress) throw new Error('unknown bus address');

    const addresses = busAddress.split(';');
    for (let i = 0; i < addresses.length; ++i) {
        const address = addresses[i];
        const familyParams = address.split(':');
        const family = familyParams[0];
        const params: any = {};
        familyParams[1].split(',').map(function(p) {
            const keyVal = p.split('=');
            params[keyVal[0]] = keyVal[1];
        });

        try {
            switch (family.toLowerCase()) {
                case 'tcp':
                    return net.createConnection(params.port, (params.host || 'localhost'));
                case 'unix':
                    if (params.socket) return net.createConnection(params.socket);
                    if (params.path) return net.createConnection(params.path);
                    throw new Error(
                        "not enough parameters for 'unix' connection - you need to specify 'socket' or 'path' parameter"
                    );
                default:
                    throw new Error('unknown address type:' + family);
            }
        } catch (e) {
            if (i < addresses.length - 1) {
                console.warn(e.message);
            } else {
                throw e;
            }
        }
    }
}