import MWSEEventTarget from './EventTarget.js';
import { PeerInfo }    from './PeerInfo.js';
import WebRTC          from './WebRTC.js';

export default class Peer extends MWSEEventTarget {
    constructor(mwse) {
        super();
        this.mwse           = mwse;
        this.options        = {};
        this.socketId       = undefined;
        this.selfSocket     = false;
        this.active         = false;
        this.peerConnection = false;
        this.primaryChannel = 'datachannel';

        this.info = new PeerInfo(this);
        this.rtc  = this._createRTC();

        // Route incoming packs: RTC signaling goes to the RTC engine,
        // everything else surfaces as a 'message' event.
        this.on('pack', data => {
            if (data.type === ':rtcpack:') {
                this.rtc.emit('input', data.payload);
            } else {
                this.emit('message', data);
            }
        });
    }

    _createRTC(rtcConfig, rtcServers) {
        const rtc  = new WebRTC(rtcConfig, rtcServers);
        rtc.peer   = this;

        rtc.on('connected',    () => { this.peerConnection = true; });
        rtc.on('disconnected', () => { this.peerConnection = false; });

        // RTC output → relay opaque `:rtcpack:` to the paired peer via server.
        rtc.on('output', payload => {
            this.send({ type: ':rtcpack:', payload });
        });

        // RTC data-channel message → surface as peer 'pack' event.
        rtc.on('message', payload => {
            this.emit('pack', payload);
        });

        this.rtc = rtc;
        return rtc;
    }

    // createRTC allows callers to (re)create the RTC object with custom config.
    createRTC(rtcConfig, rtcServers) {
        return this._createRTC(rtcConfig, rtcServers);
    }

    setPeerOptions(options) {
        if (typeof options === 'string') {
            this.setSocketId(options);
        } else {
            this.options = options;
        }
    }

    setSocketId(uuid) {
        this.socketId = uuid;
    }

    async metadata() {
        if (this.socketId === 'me') {
            const result = await this.mwse.EventPooling.request({ type: 'my/socketid' });
            this.selfSocket = true;
            this.active     = this.active || true;
            this.socketId   = result;
            this.emit('scope');
            this.activeScope = true;
            return result;
        }
    }

    async request(pack) {
        if (this.active) {
            return this.mwse.request(this.socketId, pack);
        }
    }

    equalTo(peer) {
        return this.socketId === peer.socketId;
    }

    async isReachable() {
        return this.mwse.EventPooling.request({ type: 'is/reachable', to: this.socketId });
    }

    async enablePairAuth() {
        await this.mwse.EventPooling.request({ type: 'auth/pair-system', value: 'everybody' });
    }

    async disablePairAuth() {
        await this.mwse.EventPooling.request({ type: 'auth/pair-system', value: 'disable' });
    }

    async enablePairInfo() {
        await this.mwse.EventPooling.request({ type: 'connection/pairinfo', value: true });
    }

    async disablePairInfo() {
        await this.mwse.EventPooling.request({ type: 'connection/pairinfo', value: false });
    }

    async requestPair() {
        const { message, status } = await this.mwse.EventPooling.request({
            type: 'request/pair',
            to:   this.socketId
        });
        if (message === 'ALREADY-PAIRED' || message === 'ALREADY-REQUESTED') {
            console.warn('MWSE: already paired or pair requested');
        }
        if (status === 'fail') {
            console.error('MWSE: requestPair failed', status, message);
            return false;
        }
        return true;
    }

    async endPair() {
        await this.mwse.EventPooling.request({ type: 'end/pair', to: this.socketId });
        this.mwse.pairs.delete(this.socketId);
        this.rtc?.destroy();   // WebRTC bağlantısını kapat, akışları durdur
        this.forget();
    }

    async acceptPair() {
        const { message, status } = await this.mwse.EventPooling.request({
            type: 'accept/pair',
            to:   this.socketId
        });
        if (status === 'fail') {
            console.error('MWSE: acceptPair failed', status, message);
            return false;
        }
        // Kabul eden tarafta da pairs haritasını güncelle.
        this.mwse.pairs.set(this.socketId, this);
        return true;
    }

    async rejectPair() {
        const { message, status } = await this.mwse.EventPooling.request({
            type: 'reject/pair',
            to:   this.socketId
        });
        if (status === 'fail') {
            console.error('MWSE: rejectPair failed', status, message);
            return false;
        }
        this.mwse.pairs.delete(this.socketId);
        return true;
    }

    async getPairedList() {
        const { value } = await this.mwse.EventPooling.request({
            type: 'pair/list',
            to:   this.socketId
        });
        return value;
    }

    async send(pack) {
        const serverOpen = this.mwse.server.connected;

        // WebRTC signaling (:rtcpack:) MUST always travel via the WebSocket relay —
        // never over the DataChannel. This is true even after the p2p connection is
        // established (renegotiation, new-stream ICE candidates, etc.). The DataChannel
        // does not exist yet when the first offer/answer exchange happens, and may not
        // be the right path for out-of-band signaling later either.
        const forceWS = pack.type === ':rtcpack:';

        const p2pOpen = !forceWS && this.peerConnection && this.rtc?.active;

        const channel = (p2pOpen && serverOpen)
            ? (this.primaryChannel === 'websocket' ? 'websocket' : 'datachannel')
            : 'websocket';

        if (channel === 'websocket') {
            if (!serverOpen) return;
            if (!this.mwse.writable && !forceWS) {
                console.warn('MWSE: socket is not writable');
                return;
            }
            // WOM — no waiter registered; the engine returns nil for pack/to (#33).
            this.mwse.EventPooling.only({ type: 'pack/to', pack, to: this.socketId });
        } else {
            this.rtc?.sendMessage(pack);
        }
    }

    forget() {
        this.mwse.peers.delete(this.socketId);
        this.mwse.pairs.delete(this.socketId);
    }
}