// Firebase 設定は firebase-config.js で初期化済みとする
// グローバル: firebase, database

// 状態定数
const JoinState = { WAIT: 'wait', CONSENT: 'consent', REFUSAL: 'refusal' };
const P2pState = { UNKNOWN: 'unknown', SUCCESSFUL: 'successful', FAILED: 'failed' };

new Vue({
    el: '#app',
    vuetify: new Vuetify(),
    data: {
        teacherEmail: '',
        className: '授業クラス',
        // クライアントリスト
        clients: [],
        // 表示モード
        dispMode: 'status', // 'status' or 'desktop'
        // ロックダイアログ
        showLockDlg: false,
        lockType: 'image',
        lockImage: 'image1',
        lockText: '',
        lockFColor: '#ffffff',
        lockBColor: '#000000',
        timeLimited: false,
        lockLimitedTipe: 'rdoLockTime',
        lockTime: '00:05:00',
        lockMoment: '24:59:59',
        // WebRTC関連
        localStream: null,        // 画面共有用ストリーム
        peerConnections: new Map(), // mailAddress -> RTCPeerConnection
        // Firebase参照
        dbRef: null,
        // ルーム情報
        roomRef: null,
        // 自身のシグナリングノードキー
        mySigKey: null,
        // 授業中フラグ
        classActive: false,
        // その他
        selectedCount: 0,
        canShare: false
    },
    computed: {
        statusClass() {
            return (client) => {
                if (!client.power) return 'status-offline';
                if (client.joinState === 'consent') return 'status-online';
                if (client.joinState === 'wait') return 'status-wait';
                return 'status-offline';
            };
        },
        statusText() {
            return (client) => {
                if (!client.power) return 'オフライン';
                if (client.joinState === 'consent') return '参加中';
                if (client.joinState === 'wait') return '待機中';
                if (client.joinState === 'refusal') return '拒否';
                return '不明';
            };
        }
    },
    watch: {
        dispMode(val) {
            // モード切替時に各クライアントの画面取得要求を調整
            this.clients.forEach(c => {
                if (c.p2p === 'successful' && c.power && c.joinState === 'consent') {
                    if (val === 'desktop') {
                        this.requestCapStream(c.mailAddress, true);
                    } else {
                        this.requestCapStream(c.mailAddress, false);
                    }
                }
            });
        }
    },
    methods: {
        // ========== 初期化・接続 ==========
        async initializeSystem() {
            if (!this.teacherEmail || !this.className) {
                alert('教師メールアドレスとクラス名を入力してください');
                return;
            }
            // Firebaseパスを生成
            const domain = this.teacherEmail.split('@')[1];
            const safeDomain = domain.replace(/\./g, '_');
            const roomPath = `classes/${safeDomain}/${this.className}`;
            this.dbRef = firebase.database().ref();
            this.roomRef = this.dbRef.child(roomPath);
            
            // シグナリングノードを自身用に作成
            const myNode = this.roomRef.child('controller').push();
            this.mySigKey = myNode.key;
            await myNode.set({
                email: this.teacherEmail,
                type: 'controller',
                timestamp: Date.now()
            });
            
            // 生徒リストの監視
            this.roomRef.child('students').on('child_added', (snap) => {
                const student = snap.val();
                this.addClient(student.mail, student.dispName, student.key);
            });
            this.roomRef.child('students').on('child_removed', (snap) => {
                const mail = snap.val().mail;
                this.removeClient(mail);
            });
            
            // シグナリングメッセージの受信
            this.roomRef.child('signaling').on('child_added', (snap) => {
                const msg = snap.val();
                if (msg.to === this.teacherEmail) {
                    this.handleSignalingMessage(msg);
                    snap.ref.remove(); // 処理後削除
                }
            });
            
            // 定期的な状態更新要求
            setInterval(() => {
                this.requestAllStatus();
            }, 10000);
            
            alert('初期化完了。生徒が接続するのを待っています。');
            // 既存の生徒がいる場合のために、既存ノードも読み込む
            const snapshot = await this.roomRef.child('students').once('value');
            const students = snapshot.val() || {};
            Object.values(students).forEach(s => {
                if (!this.clients.find(c => c.mailAddress === s.mail))
                    this.addClient(s.mail, s.dispName, s.key);
            });
        },
        
        addClient(mail, dispName, key) {
            if (this.clients.find(c => c.mailAddress === mail)) return;
            const client = {
                mailAddress: mail,
                dispName: dispName,
                key: key,
                selected: true,
                power: false,
                joinState: JoinState.WAIT,
                p2p: P2pState.UNKNOWN,
                activeTab: { title: '', favicon: '' },
                battery: { level: 0, charging: false },
                mouseLock: false,
                urlLimit: false,
                pVer: '',
                cVer: ''
            };
            this.clients.push(client);
            this.updateSelectedCount();
            // WebRTC接続を試みる（生徒が参加状態になったら）
            this.setupPeerConnection(mail);
        },
        
        removeClient(mail) {
            const idx = this.clients.findIndex(c => c.mailAddress === mail);
            if (idx !== -1) {
                this.closePeerConnection(mail);
                this.clients.splice(idx, 1);
                this.updateSelectedCount();
            }
        },
        
        updateSelectedCount() {
            this.selectedCount = this.clients.filter(c => c.selected).length;
        },
        
        toggleSelect(client) {
            client.selected = !client.selected;
            this.updateSelectedCount();
        },
        allSelect() {
            this.clients.forEach(c => c.selected = true);
            this.updateSelectedCount();
        },
        allUnselect() {
            this.clients.forEach(c => c.selected = false);
            this.updateSelectedCount();
        },
        
        // ========== WebRTC ==========
        async setupPeerConnection(mail) {
            const config = { iceServers: [{ urls: 'stun:stun.l.google.com:19302' }] };
            const pc = new RTCPeerConnection(config);
            this.peerConnections.set(mail, pc);
            
            // ローカルストリームがあれば追加（画面共有時）
            if (this.localStream) {
                this.localStream.getTracks().forEach(track => {
                    pc.addTrack(track, this.localStream);
                });
            }
            
            pc.ontrack = (event) => {
                const stream = event.streams[0];
                const videoEl = document.getElementById(`video_${mail}`);
                if (videoEl) videoEl.srcObject = stream;
                // クライアントのcapResをtrueに
                const client = this.clients.find(c => c.mailAddress === mail);
                if (client) client.capRes = true;
            };
            
            pc.onicecandidate = (event) => {
                if (event.candidate) {
                    this.sendSignalingMessage(mail, {
                        type: 'candidate',
                        candidate: event.candidate
                    });
                }
            };
            
            pc.onconnectionstatechange = () => {
                const client = this.clients.find(c => c.mailAddress === mail);
                if (pc.connectionState === 'connected') {
                    if (client) client.p2p = P2pState.SUCCESSFUL;
                } else if (pc.connectionState === 'failed' || pc.connectionState === 'disconnected') {
                    if (client) client.p2p = P2pState.FAILED;
                    this.closePeerConnection(mail);
                    setTimeout(() => this.setupPeerConnection(mail), 5000);
                }
            };
            
            // データチャネル（コマンド送信用）
            const dc = pc.createDataChannel('command');
            dc.onopen = () => console.log('DataChannel open', mail);
            dc.onmessage = (ev) => this.handleCommandResponse(mail, ev.data);
            
            // Offerを作成して送信（controllerからoffer）
            const offer = await pc.createOffer();
            await pc.setLocalDescription(offer);
            this.sendSignalingMessage(mail, {
                type: 'offer',
                sdp: offer.sdp
            });
        },
        
        closePeerConnection(mail) {
            const pc = this.peerConnections.get(mail);
            if (pc) {
                pc.close();
                this.peerConnections.delete(mail);
            }
            const videoEl = document.getElementById(`video_${mail}`);
            if (videoEl) videoEl.srcObject = null;
        },
        
        sendSignalingMessage(toMail, message) {
            const msg = {
                from: this.teacherEmail,
                to: toMail,
                type: message.type,
                data: message
            };
            this.roomRef.child('signaling').push(msg);
        },
        
        async handleSignalingMessage(msg) {
            const { from, data } = msg;
            const pc = this.peerConnections.get(from);
            if (!pc) return;
            
            if (data.type === 'offer') {
                await pc.setRemoteDescription(new RTCSessionDescription({ type: 'offer', sdp: data.sdp }));
                const answer = await pc.createAnswer();
                await pc.setLocalDescription(answer);
                this.sendSignalingMessage(from, { type: 'answer', sdp: answer.sdp });
            } else if (data.type === 'answer') {
                await pc.setRemoteDescription(new RTCSessionDescription({ type: 'answer', sdp: data.sdp }));
            } else if (data.type === 'candidate') {
                await pc.addIceCandidate(new RTCIceCandidate(data.candidate));
            }
        },
        
        // ========== 画面共有 ==========
        async startDesktopShare() {
            try {
                const stream = await navigator.mediaDevices.getDisplayMedia({ video: true, audio: false });
                this.localStream = stream;
                // 全選択中のクライアントに対してトラックを置き換え
                for (const client of this.clients.filter(c => c.selected)) {
                    const pc = this.peerConnections.get(client.mailAddress);
                    if (pc && pc.connectionState === 'connected') {
                        const senders = pc.getSenders();
                        const videoSender = senders.find(s => s.track && s.track.kind === 'video');
                        if (videoSender) {
                            await videoSender.replaceTrack(stream.getVideoTracks()[0]);
                        } else {
                            stream.getTracks().forEach(track => pc.addTrack(track, stream));
                        }
                    }
                }
                this.canShare = true;
                // 画面提示開始コマンド送信
                this.sendCommandToSelected('start_desktop_share', { enabled: true });
            } catch (err) {
                console.error('画面共有開始エラー:', err);
                alert('画面共有の開始に失敗しました: ' + err.message);
            }
        },
        
        stopDesktopShare() {
            if (this.localStream) {
                this.localStream.getTracks().forEach(t => t.stop());
                this.localStream = null;
            }
            this.sendCommandToSelected('stop_desktop_share', { enabled: false });
            this.canShare = false;
        },
        
        requestCapStream(mail, enable) {
            // 解像度やフレームレートの要求
            const constraint = enable ? { rate: 0.5, width: 320 } : { rate: 0, width: 0 };
            this.sendCommand(mail, 'set_cap', constraint);
        },
        
        // ========== コマンド送信 (DataChannel経由) ==========
        sendCommand(mail, cmd, params) {
            const pc = this.peerConnections.get(mail);
            if (!pc) return;
            const dc = this.getDataChannel(pc);
            if (dc && dc.readyState === 'open') {
                dc.send(JSON.stringify({ cmd, params }));
            } else {
                // フォールバック: Firebaseシグナリングで送信（簡易）
                this.sendSignalingMessage(mail, { type: 'command', cmd, params });
            }
        },
        
        sendCommandToSelected(cmd, params) {
            this.clients.filter(c => c.selected).forEach(c => {
                this.sendCommand(c.mailAddress, cmd, params);
            });
        },
        
        getDataChannel(pc) {
            // 簡易実装: 最初のデータチャネルを返す
            const channels = pc.getDataChannels?.() || [];
            if (channels.length) return channels[0];
            return null;
        },
        
        handleCommandResponse(mail, data) {
            try {
                const msg = JSON.parse(data);
                if (msg.cmd === 'status') {
                    this.updateClientStatus(mail, msg.params);
                } else if (msg.cmd === 'lock_ack') {
                    console.log('ロック適用確認', mail);
                }
            } catch(e) {}
        },
        
        updateClientStatus(mail, status) {
            const client = this.clients.find(c => c.mailAddress === mail);
            if (!client) return;
            client.power = status.power === true;
            client.joinState = status.joinState || JoinState.WAIT;
            client.activeTab = status.activeTab || { title: '', favicon: '' };
            client.battery = status.battery || { level: 0, charging: false };
            client.pVer = status.pVer || '';
            client.cVer = status.cVer || '';
            if (status.p2p) client.p2p = status.p2p;
        },
        
        async requestAllStatus() {
            this.sendCommandToSelected('get_status', {});
        },
        
        // ========== ロック機能 ==========
        openLockDialog() {
            this.showLockDlg = true;
        },
        
        executeLock() {
            const lockParams = {
                type: this.lockType,
                image: this.lockType === 'image' ? this.lockImage : null,
                text: this.lockText,
                font_color: this.lockFColor,
                bg_color: this.lockBColor,
                timeLimited: this.timeLimited,
                limitTime: this.timeLimited ? (this.lockLimitedTipe === 'rdoLockTime' ? this.lockTime : this.lockMoment) : null
            };
            this.sendCommandToSelected('lock', lockParams);
            this.showLockDlg = false;
        },
        
        unlock() {
            this.sendCommandToSelected('unlock', {});
        },
        
        // ========== デバイス情報取得 ==========
        fetchDeviceInfo() {
            this.sendCommandToSelected('get_device_info', {});
        },
        
        refreshStatus() {
            this.requestAllStatus();
        }
    }
});