{% extends "base.html" %}
{% block title %}Mobile Camera Feed{% endblock %}
{% block head %}
<style>
    body, html { margin: 0; padding: 0; width: 100%; height: 100%; overflow: hidden; background-color: #000; }
    #video-container { position: relative; width: 100%; height: 100%; }
    #mobileCamFeed { width: 100%; height: 100%; object-fit: cover; }
    
    #controls {
        position: absolute;
        bottom: 20px;
        left: 0;
        width: 100%;
        padding: 10px;
        background: rgba(0, 0, 0, 0.5);
        display: flex;
        flex-direction: column;
        gap: 10px;
        z-index: 100;
    }
    
    #debugLog {
        position: absolute;
        top: 10px;
        left: 10px;
        right: 10px;
        max-height: 100px;
        overflow-y: auto;
        background: rgba(0,0,0,0.7);
        color: #0f0;
        font-family: monospace;
        font-size: 10px;
        padding: 5px;
        pointer-events: none;
        z-index: 90;
    }
</style>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.7.2/socket.io.min.js"></script>
{% endblock %}
{% block content %}
<div id="video-container">
    <div id="debugLog"></div>
    <video id="mobileCamFeed" autoplay playsinline muted></video>
    <div id="controls">
        <select id="cameraSelect" class="form-select form-select-sm bg-dark text-white border-secondary"></select>
        <div class="d-flex gap-2">
            <button id="startBtn" class="btn btn-primary btn-sm w-50">Restart</button>
            <button id="stopBtn" class="btn btn-danger btn-sm w-50">Stop</button>
        </div>
        <button id="captureBtn" class="btn btn-success btn-sm w-100 mt-2"><i class="bi bi-camera me-2"></i>Capture</button>
    </div>
</div>
{% endblock %}
{% block scripts %}
<script>
    function log(msg) {
        const logEl = document.getElementById('debugLog');
        logEl.innerHTML += `<div>${msg}</div>`;
        logEl.scrollTop = logEl.scrollHeight;
        console.log(msg);
    }

    if (!window.isSecureContext) {
        log("WARNING: Not in a Secure Context. Camera access may be blocked.");
    }

    const socket = io();
    const video = document.getElementById('mobileCamFeed');
    const cameraSelect = document.getElementById('cameraSelect');
    let localStream;
    let peerConnection;
    const room = 'stream_room';
    
    const config = {
        iceServers: [
            { urls: 'stun:stun.l.google.com:19302' }
        ]
    };

    async function stopCamera() {
        if (localStream) {
            localStream.getTracks().forEach(track => {
                track.stop();
            });
            localStream = null;
            video.srcObject = null;
            log("Camera stopped.");
        }
    }

    async function getCameras() {
        try {
            // Request permission first to get labels
            await navigator.mediaDevices.getUserMedia({ video: true });
            const devices = await navigator.mediaDevices.enumerateDevices();
            const videoDevices = devices.filter(device => device.kind === 'videoinput');
            
            cameraSelect.innerHTML = '';
            videoDevices.forEach(device => {
                const option = document.createElement('option');
                option.value = device.deviceId;
                option.text = device.label || `Camera ${cameraSelect.length + 1}`;
                cameraSelect.appendChild(option);
            });
            
            log(`Found ${videoDevices.length} cameras`);
            
            // Try to select back camera by default
            for (let i = 0; i < cameraSelect.options.length; i++) {
                const label = cameraSelect.options[i].text.toLowerCase();
                if (label.includes('back') || label.includes('rear') || label.includes('environment')) {
                    cameraSelect.selectedIndex = i;
                    break;
                }
            }
            
            startCamera();
        } catch (err) {
            log("Error getting cameras: " + err.name + ": " + err.message);
        }
    }

    async function startCamera() {
        await stopCamera(); // Ensure previous stream is stopped

        const deviceId = cameraSelect.value;
        const constraints = {
            video: {
                deviceId: deviceId ? { exact: deviceId } : undefined,
                facingMode: deviceId ? undefined : 'environment'
            },
            audio: false
        };

        try {
            log(`Starting camera...`);
            localStream = await navigator.mediaDevices.getUserMedia(constraints);
            video.srcObject = localStream;
            socket.emit('join', { room: room });
            log("Camera started");
        } catch (err) {
            log("Start failed: " + err.name + ": " + err.message);
            // No fallback: if specific constraints fail, that's it as requested by user
        }
    }

    document.getElementById('startBtn').addEventListener('click', startCamera);
    document.getElementById('stopBtn').addEventListener('click', stopCamera);
    cameraSelect.addEventListener('change', startCamera);

    // Capture Button Logic
    document.getElementById('captureBtn').addEventListener('click', async () => {
        // Emit a capture event to the server/room
        // The desktop receiver will listen for this event and handle the actual capture/upload
        log("Sending remote capture request...");
        socket.emit('remote_capture', { room: room });
    });

    // Initialize
    getCameras();

    socket.on('user_joined', async () => {
        log("Receiver joined. Creating PeerConnection...");
        createPeerConnection();
        
        if (localStream) {
            localStream.getTracks().forEach(track => {
                peerConnection.addTrack(track, localStream);
            });
        } else {
            log("No local stream to add!");
        }

        try {
            const offer = await peerConnection.createOffer();
            await peerConnection.setLocalDescription(offer);
            socket.emit('offer', { offer: offer, room: room });
            log("Offer sent");
        } catch (e) {
            log("Error creating offer: " + e);
        }
    });

    socket.on('answer', async (answer) => {
        if (!peerConnection) return;
        log("Received answer");
        try {
            await peerConnection.setRemoteDescription(new RTCSessionDescription(answer));
        } catch (e) {
            log("Error setting remote description: " + e);
        }
    });

    socket.on('candidate', async (candidate) => {
        if (!peerConnection) return;
        try {
            await peerConnection.addIceCandidate(new RTCIceCandidate(candidate));
            // log("Added ICE candidate"); // Too verbose
        } catch (e) {
            log("Error adding ICE: " + e);
        }
    });

    function createPeerConnection() {
        if (peerConnection) peerConnection.close();
        
        peerConnection = new RTCPeerConnection(config);

        peerConnection.onicecandidate = (event) => {
            if (event.candidate) {
                socket.emit('candidate', { candidate: event.candidate, room: room });
            }
        };
        
        peerConnection.onconnectionstatechange = () => {
            log("Connection state: " + peerConnection.connectionState);
        };
    }
</script>
{% endblock %}