class invidious_embed {
    static widgetid = 0;

    static eventname_table = {
        onPlaybackRateChange: 'ratechange',
        onStateChange: 'statechange',
        onError: 'error',
        onReady: 'ready'
    };

    static available_event_name = [
        'ready',
        'ended',
        'error',
        'ratechange',
        'volumechange',
        'waiting',
        'timeupdate',
        'loadedmetadata',
        'play',
        'seeking',
        'seeked',
        'playerresize',
        'pause'
    ];

    static api_promise = false;
    static invidious_instance = '';
    static api_instance_list = [];
    static instance_status_list = {};
    static videodata_cahce = {};

    addEventListener(eventname, func) {
        if (typeof func === 'function') {
            if (eventname in invidious_embed.eventname_table) {
                this.eventobject[invidious_embed.eventname_table[eventname]].push(func);
            } else if (invidious_embed.available_event_name.includes(eventname)) {
                this.eventobject[eventname].push(func);
            } else {
                console.warn('addEventListener cannot find such eventname : ' + eventname);
            }
        } else {
            console.warn("addEventListner secound args must be function");
        }
    }

    removeEventListener(eventname, func) {
        if (typeof func === 'function') {
            let internal_eventname;
            if (eventname in invidious_embed.eventname_table) {
                internal_eventname = invidious_embed.eventname_table[eventname];
            } else if (invidious_embed.available_event_name.includes(eventname)) {
                internal_eventname = eventname;
            } else {
                console.warn('removeEventListner cannot find such eventname : ' + eventname);
                return;
            }

            this.eventobject[internal_eventname] = this.eventobject[internal_eventname].filter(listed_function => {
                const allowFunctionDetected = listed_function.toString()[0] === '(';
                if (allowFunctionDetected) {
                    listed_function.toString() !== func.toString();
                } else {
                    listed_function !== func;
                }
            });
        } else {
            console.warn("removeEventListener secound args must be function");
        }
    }

    async instance_access_check(instance_origin) {
        let return_status;
        const status_cahce_exist = instance_origin in invidious_embed.instance_status_list;
        if (!status_cahce_exist) {
            try {
                const instance_stats = await fetch(instance_origin + '/api/v1/stats');
                if (instance_stats.ok) {
                    const instance_stats_json = await instance_stats.json();
                    return_status = (instance_stats_json.software.name === 'invidious');
                } else {
                    return_status = false;
                }
            } catch {
                return_status = false;
            }
            invidious_embed.instance_status_list[instance_origin] = return_status;
            return return_status;
        } else {
            return invidious_embed.instance_status_list[instance_origin];
        }
    }

    async get_instance_list() {
        invidious_embed.api_instance_list = [];
        const instance_list_api = await (await fetch('https://api.invidious.io/instances.json?pretty=1&sort_by=type,users')).json();
        instance_list_api.forEach(instance_data => {
            const http_check = instance_data[1]['type'] === 'https';
            let status_check_api_data;
            if (instance_data[1]['monitor'] !== null) {
                status_check_api_data = instance_data[1]['monitor']['statusClass'] === 'success';
            }
            const api_available = instance_data[1]['api'] && instance_data[1]['cors'];
            if (http_check && status_check_api_data && api_available) {
                invidious_embed.api_instance_list.push(instance_data[1]['uri']);
            }
        });
    }

    async auto_instance_select() {
        if (await this.instance_access_check(invidious_embed.invidious_instance)) {
            return;
        } else {
            if (invidious_embed.api_instance_list.length === 0) {
                await this.get_instance_list();
            }
            for (let x = 0; x < invidious_embed.api_instance_list.length; x++) {
                if (await this.instance_access_check(invidious_embed.api_instance_list[x])) {
                    invidious_embed.invidious_instance = invidious_embed.api_instance_list[x];
                    break;
                }
            }
        }
    }

    async videodata_api(videoid) {
        const not_in_videodata_cahce = !(videoid in invidious_embed.videodata_cahce);
        if (not_in_videodata_cahce) {
            const video_api_response = await fetch(invidious_embed.invidious_instance + "/api/v1/videos/" + videoid);
            if (video_api_response.ok) {
                invidious_embed.videodata_cahce[videoid] = Object.assign({}, { status: true }, await video_api_response.json());
            } else {
                invidious_embed.videodata_cahce[videoid] = { status: false };
            }
        }
        return invidious_embed.videodata_cahce[videoid];
    }

    async videoid_accessable_check(videoid) {
        return (await this.videodata_api(videoid)).status;
    }

    async getPlaylistVideoids(playlistid) {
        const playlist_api_response = await fetch(invidious_embed.invidious_instance + "/api/v1/playlists/" + playlistid);
        if (playlist_api_response.ok) {
            const playlist_api_json = await playlist_api_response.json();
            let tmp_videoid_list = [];
            playlist_api_json.videos.forEach(videodata => tmp_videoid_list.push(videodata.videoId));
            return tmp_videoid_list;
        } else {
            return [];
        }
    }

    async Player(element, options) {
        this.player_status = -1;
        this.error_code = 0;
        this.volume = 100;
        this.loop = false;
        this.playlistVideoIds = [];

        this.eventobject = {
            ready: [],
            ended: [],
            error: [],
            ratechange: [],
            volumechange: [],
            waiting: [],
            timeupdate: [],
            loadedmetadata: [],
            play: [],
            seeking: [],
            seeked: [],
            playerresize: [],
            pause: [],
            statechange: []
        };

        let replace_elemnt;
        this.isPlaylistVideoList = false;
        if (element === undefined || element === null) {
            throw 'Please, pass element id or HTMLElement as first argument';
        } else if (typeof element === 'string') {
            replace_elemnt = document.getElementById(element);
        } else {
            replace_elemnt = element;
        }

        let iframe_src = '';
        if (options.host !== undefined && options.host !== "") {
            iframe_src = new URL(options.host).origin;
        } else if (invidious_embed.invidious_instance !== '') {
            iframe_src = invidious_embed.invidious_instance;
        }

        if (!await this.instance_access_check(iframe_src)) {
            await this.auto_instance_select();
            iframe_src = invidious_embed.invidious_instance;
        }

        invidious_embed.invidious_instance = iframe_src;
        this.target_origin = iframe_src;
        iframe_src += '/embed/';

        if (typeof options.videoId === 'string' && options.videoId.length === 11) {
            iframe_src += options.videoId;
            this.videoId = options.videoId;
            if (!await this.videoid_accessable_check(options.videoId)) {
                this.error_code = 100;
                this.event_executor('error');
                return;
            }
        } else {
            this.error_code = 2;
            this.event_executor('error');
            return;
        }

        let search_params = new URLSearchParams('');
        search_params.append('widgetid', invidious_embed.widgetid);
        this.widgetid = invidious_embed.widgetid;
        invidious_embed.widgetid++;
        search_params.append('origin', location.origin);
        search_params.append('enablejsapi', '1');

        let no_start_parameter = true;
        if (typeof options.playerVars === 'object') {
            this.option_playerVars = options.playerVars;
            Object.keys(options.playerVars).forEach(key => {
                if (typeof key === 'string') {
                    let keyValue = options.playerVars[key];
                    switch (typeof keyValue) {
                        case 'number':
                            keyValue = keyValue.toString();
                            break;
                        case 'string':
                            break;
                        default:
                            console.warn('player vars key value must be string or number');
                    }
                    search_params.append(key, keyValue);
                } else {
                    console.warn('player vars key must be string');
                }
            });

            if (options.playerVars.start !== undefined) {
                no_start_parameter = false;
            }

            if (options.playerVars.autoplay === undefined) {
                search_params.append('autoplay', '0');
            }

        } else {
            search_params.append('autoplay', '0');
        }

        if (no_start_parameter) {
            search_params.append('start', '0');
        }

        iframe_src += "?" + search_params.toString();

        if (typeof options.events === 'object') {
            Object.keys(options.events).forEach(key => {
                if (typeof options.events[key] === 'function') {
                    this.addEventListener(key, options.events[key]);
                } else {
                    console.warn('event function must be function');
                }
            });
        }

        this.player_iframe = document.createElement("iframe");
        this.loaded = false;
        this.addEventListener('loadedmetadata', () => { this.event_executor('ready'); this.loaded = true; });
        this.addEventListener('loadedmetadata', () => { this.setVolume(this.volume); });
        this.addEventListener('ended', () => { if (this.isPlaylistVideoList) { this.nextVideo() } })
        this.player_iframe.src = iframe_src;

        if (typeof options.width === 'number') {
            this.player_iframe.width = options.width;
        } else {
            this.player_iframe.width = 640;
            this.player_iframe.style.maxWidth = '100%';
        }

        if (typeof options.height === 'number') {
            this.player_iframe.height = options.height;
        } else {
            this.player_iframe.height = this.player_iframe.width * (9 / 16);
        }

        this.player_iframe.style.border = "none";
        replace_elemnt.replaceWith(this.player_iframe);
        this.eventdata = {};
        return this;
    }

    postMessage(data) {
        const additionalInfo = { 
            'origin': location.origin, 
            'widgetid': this.widgetid.toString(), 
            'target': 'invidious_control' 
        };
        data = Object.assign(additionalInfo, data);
        this.player_iframe.contentWindow.postMessage(data, this.target_origin);
    }

    event_executor(eventname) {
        const execute_functions = this.eventobject[eventname];
        let return_data = { 
            type: eventname, 
            data: null, 
            target: this 
        };
        switch (eventname) {
            case 'statechange':
                return_data.data = this.getPlayerState();
                break;
            case 'error':
                return_data.data = this.error_code;
        }
        execute_functions.forEach(func => {
            try {
                func(return_data);
            } catch (e) {
                console.error(e);
            }
        });
    }

    receiveMessage(message) {
        const onControlAndHasWidgetId = message.data.from === 'invidious_control' && message.data.widgetid === this.widgetid.toString();
        if (onControlAndHasWidgetId) {
            switch (message.data.message_kind) {
                case 'info_return':
                    const promise_array = this.message_wait[message.data.command];
                    promise_array.forEach(element => {
                        if (message.data.command === 'getvolume') {
                            element(message.data.value * 100);
                        } else {
                            element(message.data.value);
                        }
                    });
                    this.message_wait[message.data.command] = [];
                    break;
                case 'event':
                    if (typeof message.data.eventname === 'string') {
                        this.event_executor(message.data.eventname);
                        const previous_status = this.player_status;
                        switch (message.data.eventname) {
                            case 'ended':
                                this.player_status = 0;
                                break;
                            case 'play':
                                this.player_status = 1;
                                break;
                            case 'timeupdate':
                                this.player_status = 1;
                                this.eventdata = Object.assign({}, this.eventdata, message.data.value);
                                break;
                            case 'pause':
                                this.player_status = 2;
                                break;
                            case 'waiting':
                                this.player_status = 3;
                                break;
                            case 'loadedmetadata':
                                this.eventdata = Object.assign({}, this.eventdata, message.data.value);
                                break;
                        }
                        if (previous_status !== this.player_status) {
                            this.event_executor('statechange');
                        }
                    }
            }
        }
    }

    promise_send_event(event_name) {
        if (invidious_embed.api_promise) {
            const promise_object = new Promise((resolve, reject) => this.message_wait[event_name].push(resolve) );
            this.postMessage({
                eventname: event_name 
            });
            return promise_object;
        } else {
            return this.eventdata[event_name];
        }
    }

    getPlayerState() {
        return this.player_status;
    }

    playVideo() {
        this.postMessage({ eventname: 'play' });
    }

    pauseVideo() {
        this.postMessage({ eventname: 'pause' });
    }

    getVolume() {
        return this.promise_send_event('getvolume');
    }

    setVolume(volume) {
        if (typeof volume === 'number') {
            this.volume = volume;
            if (volume !== NaN && volume >= 0 && volume <= 100) {
                this.postMessage({ eventname: 'setvolume', value: volume / 100 });
            }
        } else {
            console.warn("setVolume first argument must be number");
        }
    }

    getIframe() {
        return this.player_iframe;
    }

    destroy() {
        this.player_iframe.remove();
    }

    mute() {
        this.postMessage({ eventname: 'setmutestatus', value: true });
    }

    unMute() {
        this.postMessage({ eventname: 'setmutestatus', value: false });
    }

    isMuted() {
        return this.promise_send_event('getmutestatus');
    }

    seekTo(seconds, allowSeekAhead) {//seconds must be a number and allowSeekAhead is ignore
        if (typeof seconds === 'number') {
            if (seconds !== NaN && seconds !== undefined) {
                this.postMessage({ eventname: 'seek', value: seconds });
            }
        } else {
            console.warn('seekTo first argument type must be number')
        }
    }

    setSize(width, height) {//width and height must be Number
        if (typeof width === 'number' && typeof height === 'number') {
            this.player_iframe.width = width;
            this.player_iframe.height = height;
        } else {
            console.warn('setSize first and secound argument type must be number');
        }
    }

    getPlaybackRate() {
        return this.promise_send_event('getplaybackrate');
    }

    setPlaybackRate(suggestedRate) {//suggestedRate must be number.this player allow not available playback rate such as 1.4
        if (typeof suggestedRate === 'number') {
            if (suggestedRate !== NaN) {
                this.postMessage({ eventname: 'setplaybackrate', value: suggestedRate });
            } else {
                console.warn('setPlaybackRate first argument NaN is no valid');
            }
        } else {
            console.warn('setPlaybackRate first argument type must be number');
        }
    }

    getAvailablePlaybackRates() {
        return this.promise_send_event('getavailableplaybackrates');
    }

    async playOtherVideoById(option, autoplay, startSeconds_arg, additional_argument) {//internal fuction
        let videoId = '';
        let startSeconds = 0;
        let endSeconds = -1;
        let mediaContetUrl = '';

        if (typeof option === 'string') {
            if (option.length === 11) {
                videoId = option;
            } else {
                mediaContetUrl = option;
            }

            if (typeof startSeconds_arg === 'number') {
                startSeconds = startSeconds_arg;
            }
        } else if (typeof option === 'object') {
            if (typeof option.videoId === 'string') {

                if (option.videoId.length == 11) {
                    videoId = option.videoId;
                } else {
                    this.error_code = 2;
                    this.event_executor('error');
                    return;
                }
            } else if (typeof option.mediaContentUrl === 'string') {
                mediaContetUrl = option.mediaContentUrl;
            } else {
                this.error_code = 2;
                this.event_executor('error');
                return;
            }

            if (typeof option.startSeconds === 'number' && option.startSeconds >= 0) {
                startSeconds = option.startSeconds;
            }

            if (typeof option.endSeconds === 'number' && option.endSeconds >= 0) {
                endSeconds = option.endSeconds;
            }
        }
        if (mediaContetUrl.length > 0) {
            const match_result = mediaContetUrl.match(/\/([A-Za-z0-9]{11})/);
            if (match_result !== null && match_result.length === 2) {
                videoId = match_result[1];
            } else {
                this.error_code = 2;
                this.event_executor('error');
                return;
            }
        }

        let iframe_sorce = this.target_origin.slice();
        iframe_sorce += "/embed/" + videoId;
        this.videoId = videoId;

        if (!await this.videoid_accessable_check(videoId)) {
            this.error_code = 100;
            this.event_executor('error');
            return;
        }

        let search_params = new URLSearchParams('');
        search_params.append('origin', location.origin);
        search_params.append('enablejsapi', '1');
        search_params.append('widgetid', invidious_embed.widgetid);
        this.widgetid = invidious_embed.widgetid;
        invidious_embed.widgetid++;
        search_params.append('autoplay', Number(autoplay));

        if (this.option_playerVars !== undefined) {
            const ignore_keys = ['autoplay', 'start', 'end', 'index', 'list'];
            Object.keys(this.option_playerVars).forEach(key => {
                if (!ignore_keys.includes(key)) {
                    search_params.append(key, this.option_playerVars[key]);
                }
            })
        }

        if (typeof additional_argument === 'object') {
            const ignore_keys = ['autoplay', 'start', 'end'];
            Object.keys(additional_argument).forEach(key => {
                if (!ignore_keys.includes(key)) {
                    search_params.append(key, additional_argument[key]);
                }
            })
        }

        search_params.append('start', startSeconds);
        if (endSeconds !== -1 && endSeconds >= 0) {
            if (endSeconds > startSeconds) {
                search_params.append('end', endSeconds);
            } else {
                throw 'Invalid end seconds because end seconds before start seconds';
            }
        }

        iframe_sorce += "?" + search_params.toString();
        this.player_iframe.src = iframe_sorce;

        if (autoplay) {
            this.player_status = 5;
        }
        this.eventdata = {};
    }

    loadVideoById(option, startSeconds) {
        this.isPlaylistVideoList = false;
        this.playOtherVideoById(option, true, startSeconds, {});
    }

    cueVideoById(option, startSeconds) {
        this.isPlaylistVideoList = false;
        this.playOtherVideoById(option, false, startSeconds, {});
    }

    cueVideoByUrl(option, startSeconds) {
        this.isPlaylistVideoList = false;
        this.playOtherVideoById(option, false, startSeconds, {});
    }

    loadVideoByUrl(option, startSeconds) {
        this.isPlaylistVideoList = false;
        this.playOtherVideoById(option, true, startSeconds, {});
    }

    async playPlaylist(playlistData, autoplay, index, startSeconds) {
        let playlistId;
        if (typeof playlistData === 'string') {
            this.playlistVideoIds = [playlistData];
            this.isPlaylistVideoList = true;
        } else if (typeof playlistData === 'object') {
            if (Array.isArray(playlistData)) {
                this.playlistVideoIds = playlistData;
                this.isPlaylistVideoList = true;
            } else {
                index = playlistData['index'];
                let listType = 'playlist';
                if (typeof playlistData['listType'] === 'string') {
                    listType = playlistData['listType'];
                }

                switch (listType) {
                    case 'playlist':
                        if (typeof playlistData['list'] === 'string') {
                            this.playlistVideoIds = await this.getPlaylistVideoids(playlistData['list']);
                            playlistId = playlistData['list'];
                        } else {
                            console.error('playlist data list must be string');
                            return;
                        }
                        break;
                    case 'user_uploads':
                        console.warn('sorry user_uploads not support');
                        return;
                    default:
                        console.error('listType : ' + listType + ' is unknown');
                        return;
                }
            }

            if (typeof playlistData.startSeconds === 'number') {
                startSeconds = playlistData.startSeconds;
            }
        } else {
            console.error('playlist function first argument must be string or array of string');
            return;
        }

        if (this.playlistVideoIds.length === 0) {
            console.error('playlist length 0 is invalid');
            return;
        }
        let parameter = { index: 0 };
        if (typeof index === 'undefined') {
            index = 0;
        } else if (typeof index === 'number') {
            parameter.index = index;
        } else {
            console.error('index must be number of undefined');
        }

        if (typeof playlistId === 'string') {
            parameter['list'] = playlistId;
            this.playlistId = playlistId;
        }
        this.sub_index = parameter.index;

        if (index >= this.playlistVideoIds.length) {
            index = 0;
            parameter.index = 0;
        }
        this.playOtherVideoById(this.playlistVideoIds[index], autoplay, startSeconds, parameter);
    }

    cuePlaylist(data, index, startSeconds) {
        this.playPlaylist(data, false, index, startSeconds);
    }

    loadPlaylist(data, index, startSeconds) {
        this.playPlaylist(data, true, index, startSeconds);
    }

    playVideoAt(index) {
        if (typeof index === 'number') {
            let parameter = { index: index };
            if (this.playlistId !== undefined) {
                parameter['list'] = this.playlistId;
            }
            this.playOtherVideoById(this.playlistVideoIds[index], true, 0, parameter);
        } else {
            console.error('playVideoAt first argument must be number');
        }
    }

    async nextVideo() {
        let now_index = this.promise_send_event('getplaylistindex');
        if (now_index === null) {
            now_index = this.sub_index;
        }

        if (now_index === this.playlistVideoIds.length - 1) {
            if (this.loop) {
                now_index = 0;
            } else {
                console.log('end of playlist');
                return;
            }
        } else {
            now_index++;
        }
        this.sub_index = now_index;
        let parameter = { index: now_index };
        if (this.playlistId !== undefined) {
            parameter['list'] = this.playlistId;
        }
        this.playOtherVideoById(this.playlistVideoIds[now_index], true, 0, parameter);
    }

    async previousVideo() {
        let now_index = this.promise_send_event('getplaylistindex');
        if (now_index === null) {
            now_index = this.sub_index;
        }
        if (now_index === 0) {
            if (this.loop) {
                now_index = this.playlistVideoIds.length - 1;
            } else {
                console.log('back to start of playlist');
                return;
            }
        } else {
            now_index--;
        }
        this.sub_index = now_index;
        let parameter = { index: now_index };
        if (this.playlistId !== undefined) {
            parameter['list'] = this.playlistId;
        }
        this.playOtherVideoById(this.playlistVideoIds[now_index], true, 0, parameter);
    }

    getDuration() {
        return this.promise_send_event('getduration');
    }

    getVideoUrl() {
        return this.target_origin + "/watch?v=" + this.videoId;
    }

    getTitle() {
        return this.promise_send_event('gettitle');
    }

    getVideoEmbedCode() {
        const embed_url = encodeURI(`${this.target_origin}/embed/${this.videoId}`);
        const html_escape = (html) => {
            const html_escaped = html.replace(/[&'`"<>]/g, match => {
                return {
                    '&': '&amp;',
                    "'": '&#x27;',
                    '`': '&#x60;',
                    '"': '&quot;',
                    '<': '&lt;',
                    '>': '&gt;',
                }[match]
            });
            return html_escaped;
        }
        const iframe_constractor = (raw_title) => {
            const html_escaped_title = html_escape(raw_title);
            return `<iframe width="560" height="315" src="${embed_url}" title="${html_escaped_title}" frameborder="0" allow="autoplay;encrypted-media;picture-in-picture;web-share" allowfullscreen></iframe>`;
        }
        if (invidious_embed.api_promise) {
            return new Promise(async (resolve, reject) => {
                resolve(iframe_constractor(await this.getTitle()));
            })
        }
        else {
            return iframe_constractor(this.getTitle());
        }
    }

    getCurrentTime() {
        return this.promise_send_event('getcurrenttime');
    }

    async getVideoData() {
        const videoData = await this.videodata_api(this.videoId);
        return { 
            video_id: this.videoId, 
            title: await this.promise_send_event('gettitle'), 
            list: await this.promise_send_event('getplaylistid'), 
            isListed: videoData.isListed, 
            isLive: videoData.liveNow, 
            isPremiere: videoData.premium 
        };
    }

    getPlaylistIndex() {
        return this.promise_send_event('getplaylistindex');
    }

    getPlaylist() {
        return this.playlistVideoIds !== undefined ? this.playlistVideoIds : [];
    }

    setLoop(loopStatus) {
        if (typeof loopStatus === 'boolean') {
            this.loop = loopStatus;
        } else {
            console.error('setLoop first argument must be bool');
        }
    }

    constructor(element, options) {
        this.Player(element, options);
        window.addEventListener('message', (ms) => { this.receiveMessage(ms) });
        this.message_wait = {
            getvolume: [],
            getmutestatus: [],
            getduration: [],
            getcurrenttime: [],
            getplaybackrate: [],
            getavailableplaybackrates: [],
            gettitle: []
        };
    }
}

function invidious_ready(func) {
    if (typeof func === 'function') {
        func();
    }
    else {
        console.warn('invidious.ready first argument must be function');
    }
}

invidious_embed.invidious_instance = new URL(document.currentScript.src).origin;

const invidious = {
    Player: invidious_embed,
    PlayerState: {
        ENDED: 0,
        PLAYING: 1,
        PAUSED: 2,
        BUFFERING: 3,
        CUED: 5
    },
    ready: invidious_ready
};

if (typeof onInvidiousIframeAPIReady === 'function') {
    try {
        onInvidiousIframeAPIReady();
    } catch (e) {
        console.error(e);
    }
}