// 拡大表示画面: 教師からの映像/画像を受信して表示
new Vue({
    el: '#app',
    data: {
        showToolbar: true,
        targetName: '拡大表示',
        teacherEmail: '',
        myMail: '',
        roomPath: '',
        roomRef: null,
        pc: null,
        timeoutHide: null
    },
    mounted() {
        // URLパラメータから教師メール、生徒メール、クラス名を取得
        const urlParams = new URLSearchParams(window.location.search);
        this.teacherEmail = urlParams.get('teacher') || '';
        this.myMail = urlParams.get('student') || '';
        const className = urlParams.get('class') || '';
        if (!this.teacherEmail || !this.myMail || !className) {
            alert('不正な起動です。コントローラから開いてください。');
            window.close();
        }
        const domain = this.teacherEmail.split('@')[1];
        const safeDomain = domain.replace(/\./g, '_');
        this.roomPath = `classes/${safeDomain}/${className}`;
        this.roomRef = firebase.database().ref(this.roomPath);
        
        this.setupWebRTC();
        this.setupSignaling();
        
        // ツールバー自動非表示
        setTimeout(() => this.hideToolbarDelayed(), 3000);
    },
    methods: {
        async setupWebRTC() {
            const config = { iceServers: [{ urls: 'stun:stun.l.google.com:19302' }] };
            this.pc = new RTCPeerConnection(config);
            
            this.pc.ontrack = (event) => {
                const videoEl = document.getElementById('remoteVideo');
                videoEl.srcObject = event.streams[0];
                videoEl.style.display = 'block';
                document.getElementById('remoteImage').style.display = 'none';
            };
            
            this.pc.onicecandidate = (event) => {
                if (event.candidate) {
                    this.sendSignal({ type: 'candidate', candidate: event.candidate });
                }
            };
            
            // データチャネル受信
            this.pc.ondatachannel = (event) => {
                const dc = event.channel;
                dc.onmessage = (ev) => {
                    const msg = JSON.parse(ev.data);
                    if (msg.cmd === 'lock') {
                        this.applyLock(msg.params);
                    } else if (msg.cmd === 'unlock') {
                        this.releaseLock();
                    }
                };
            };
            
            // Offerを受信するために、受信側はダミーのオファーを送る？ 
            // 簡易実装: コントローラからのOfferを待つので、先にデータチャネルを作成しておく
            const dc = this.pc.createDataChannel('command');
            dc.onopen = () => console.log('DataChannel open');
            dc.onmessage = (ev) => {
                const msg = JSON.parse(ev.data);
                if (msg.cmd === 'lock') this.applyLock(msg.params);
                else if (msg.cmd === 'unlock') this.releaseLock();
            };
            
            const offer = await this.pc.createOffer();
            await this.pc.setLocalDescription(offer);
            this.sendSignal({ type: 'offer', sdp: offer.sdp });
        },
        
        sendSignal(data) {
            const signalRef = this.roomRef.child('signaling');
            signalRef.push({
                from: this.myMail,
                to: this.teacherEmail,
                type: data.type,
                data: data
            });
        },
        
        setupSignaling() {
            this.roomRef.child('signaling').on('child_added', async (snap) => {
                const msg = snap.val();
                if (msg.to === this.myMail && msg.from === this.teacherEmail) {
                    const { type, data } = msg;
                    if (type === 'offer') {
                        await this.pc.setRemoteDescription(new RTCSessionDescription({ type: 'offer', sdp: data.sdp }));
                        const answer = await this.pc.createAnswer();
                        await this.pc.setLocalDescription(answer);
                        this.sendSignal({ type: 'answer', sdp: answer.sdp });
                    } else if (type === 'answer') {
                        await this.pc.setRemoteDescription(new RTCSessionDescription({ type: 'answer', sdp: data.sdp }));
                    } else if (type === 'candidate') {
                        await this.pc.addIceCandidate(new RTCIceCandidate(data.candidate));
                    } else if (type === 'command') {
                        // コマンド直接受信 (fallback)
                        if (data.cmd === 'lock') this.applyLock(data.params);
                        else if (data.cmd === 'unlock') this.releaseLock();
                    }
                    snap.ref.remove();
                }
            });
        },
        
        applyLock(params) {
            // 実際のロック画面表示（簡易）
            if (params.type === 'text') {
                document.body.style.backgroundColor = params.bg_color;
                document.body.style.color = params.font_color;
                document.body.innerHTML = `<div style="display:flex; justify-content:center; align-items:center; height:100vh; font-size:2rem;">${params.text}</div>`;
            } else {
                // 画像表示
                const imgUrl = `./assets/lock_${params.image}.png`; // 実際の画像パス
                document.body.innerHTML = `<img src="${imgUrl}" style="width:100%; height:100%; object-fit:cover;">`;
            }
            document.body.style.overflow = 'hidden';
        },
        
        releaseLock() {
            // ロック解除 → 再読み込みなど
            location.reload();
        },
        
        hideToolbarDelayed() {
            if (this.timeoutHide) clearTimeout(this.timeoutHide);
            this.timeoutHide = setTimeout(() => { this.showToolbar = false; }, 3000);
        },
        
        closeWindow() {
            window.close();
        }
    }
});