/**
 * OpusBike App — Main UI Logic
 * Auto-detects role: Bridge (BLE + upload), Viewer (WS only), Demo
 */

const app = (() => {
    let mode = 'idle'; // idle | ble | demo | relay
    let rideStartTime = null;
    let rideTimer = null;
    let demoTimer = null;
    let demoTick = 0;
    const DEMO_MODES = ['ECO', 'TOUR', 'eMTB', 'TURBO', 'TOUR', 'ECO'];

    // Structured speed profile (60s cycle): [time_pct, target_speed]
    const SPEED_PROFILE = [
        [0, 0], [0.05, 15], [0.2, 28], [0.35, 22],
        [0.5, 30], [0.7, 25], [0.85, 18], [0.95, 5], [1, 0]
    ];

    /**
     * Detect iOS (iPhone/iPad/iPod)
     */
    function isIOS() {
        return /iPhone|iPad|iPod/.test(navigator.userAgent) ||
            (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1);
    }

    /**
     * Detect app mode based on Web Bluetooth availability
     * - Bridge mode: navigator.bluetooth exists (Bluefy on iOS, Chrome on desktop/Android)
     * - Viewer mode: no bluetooth API (Safari, Firefox, etc.)
     */
    function detectMode() {
        return BLEService.isAvailable() ? 'bridge' : 'viewer';
    }

    /**
     * Initialize the app
     */
    function init() {
        const detectedMode = detectMode();
        const modeLabel = document.getElementById('mode-label');

        if (detectedMode === 'viewer') {
            // No BLE — hide connect button, show viewer UI
            document.getElementById('btn-connect').classList.add('hidden');
            document.getElementById('ble-unsupported').classList.remove('hidden');

            // On iOS without Bluefy, show hint
            if (isIOS()) {
                document.getElementById('ios-bluefy-hint').classList.remove('hidden');
            }

            if (modeLabel) modeLabel.textContent = 'Viewer (live)';

            // Auto-connect to WebSocket relay as viewer
            startRelayViewer();
        } else {
            // BLE available — bridge mode
            if (modeLabel) modeLabel.textContent = 'BLE Bridge (uploading)';
        }

        // Set up BLE callbacks
        BLEService.onData((data) => {
            updateDashboard(data);
            // Forward to WebSocket relay for other devices
            WSRelay.sendTelemetry(data);
        });

        BLEService.onStatus(handleBleStatus);
    }

    /**
     * Interpolate speed from the structured profile
     */
    function getProfileSpeed(pct) {
        for (let i = 1; i < SPEED_PROFILE.length; i++) {
            if (pct <= SPEED_PROFILE[i][0]) {
                const [t0, s0] = SPEED_PROFILE[i - 1];
                const [t1, s1] = SPEED_PROFILE[i];
                const ratio = (pct - t0) / (t1 - t0);
                const eased = ratio * ratio * (3 - 2 * ratio);
                return s0 + (s1 - s0) * eased;
            }
        }
        return 0;
    }

    /**
     * Connect to bike via BLE (bridge mode — phone connects to bike)
     */
    async function connect() {
        try {
            const name = await BLEService.connect();
            mode = 'ble';
            rideStartTime = Date.now();
            startRideTimer();
            showRideView('connected', `BLE Bridge: ${name}`);
            setDemoBadge(false);

            // Also connect to WS relay as source to upload data to VPS
            WSRelay.connect(true);
        } catch (error) {
            alert(error.message);
        }
    }

    /**
     * Disconnect
     */
    function disconnect() {
        if (mode === 'ble') {
            BLEService.disconnect();
        }
        if (mode === 'demo') {
            stopDemo();
        }
        WSRelay.disconnect();
        stopRideTimer();
        mode = 'idle';
        setDemoBadge(false);
        showConnectView();
    }

    /**
     * Start Demo Mode — structured simulation per spec
     */
    function startDemo() {
        mode = 'demo';
        rideStartTime = Date.now();
        demoTick = 0;
        startRideTimer();
        showRideView('demo', 'Demo Mode');
        setDemoBadge(true);

        // Connect to WS relay as source (so other devices see the demo too)
        WSRelay.connect(true);

        let totalKm = 1847.2;
        const CYCLE_TICKS = 120; // 60 seconds at 500ms interval

        demoTimer = setInterval(() => {
            demoTick++;
            const cyclePct = (demoTick % CYCLE_TICKS) / CYCLE_TICKS;

            const targetSpeed = getProfileSpeed(cyclePct);
            const speed = Math.max(0, targetSpeed + (Math.random() - 0.5) * 2);

            const baseTorque = speed > 0.5 ? (speed * 1.8) + 5 : 0;
            const torque = Math.round(Math.max(0, baseTorque + (Math.random() - 0.5) * 8));

            totalKm += speed / 3600 * 0.5;

            // Cycle through modes every 15 seconds (30 ticks)
            const modeIndex = Math.floor(demoTick / 30) % DEMO_MODES.length;

            const data = {
                speed: Math.round(speed * 10) / 10,
                torque: torque,
                totalKm: Math.round(totalKm * 10) / 10,
                mode: DEMO_MODES[modeIndex]
            };

            updateDashboard(data);
            WSRelay.sendTelemetry(data);
        }, 500);
    }

    /**
     * Stop Demo Mode
     */
    function stopDemo() {
        clearInterval(demoTimer);
        demoTimer = null;
        demoTick = 0;
    }

    /**
     * Show/hide DEMO badge
     */
    function setDemoBadge(visible) {
        const badge = document.getElementById('demo-badge');
        if (badge) {
            badge.classList.toggle('visible', visible);
        }
    }

    /**
     * Start relay viewer mode (for devices without BLE)
     */
    function startRelayViewer() {
        WSRelay.onData((data) => {
            if (mode !== 'relay') {
                mode = 'relay';
                rideStartTime = Date.now();
                startRideTimer();
                showRideView('relay', 'Viewer (live)');
                setDemoBadge(false);
            }
            updateDashboard(data);
        });

        WSRelay.onStatus((status) => {
            const wsText = document.getElementById('ws-status-text');
            if (wsText) {
                switch (status) {
                    case 'connected':
                        wsText.textContent = 'Connected to relay — waiting for bike data...';
                        break;
                    case 'source_connected':
                        wsText.textContent = 'Bike bridge connected — receiving live data!';
                        break;
                    case 'source_disconnected':
                        wsText.textContent = 'Bike bridge disconnected';
                        break;
                    case 'disconnected':
                        wsText.textContent = 'Relay disconnected — reconnecting...';
                        break;
                }
            }
        });

        WSRelay.connect(false);
    }

    /**
     * Update dashboard with telemetry data
     */
    function updateDashboard(data) {
        document.getElementById('val-speed').textContent = (data.speed || 0).toFixed(1);
        document.getElementById('val-torque').textContent = Math.round(data.torque || 0);
        document.getElementById('val-totalkm').textContent = (data.totalKm || 0).toFixed(1);

        const modeStr = data.mode || 'OFF';
        document.getElementById('val-mode').textContent = modeStr;

        // Update mode indicator dots
        document.querySelectorAll('.mode-dot').forEach(dot => {
            const isActive = dot.dataset.mode === modeStr ||
                (dot.dataset.mode === 'EMTB' && modeStr === 'eMTB');
            dot.classList.toggle('active', isActive);
        });
    }

    /**
     * Start ride timer
     */
    function startRideTimer() {
        stopRideTimer();
        rideTimer = setInterval(() => {
            if (!rideStartTime) return;
            const elapsed = Math.floor((Date.now() - rideStartTime) / 1000);
            const h = String(Math.floor(elapsed / 3600)).padStart(2, '0');
            const m = String(Math.floor((elapsed % 3600) / 60)).padStart(2, '0');
            const s = String(elapsed % 60).padStart(2, '0');
            document.getElementById('val-time').textContent = `${h}:${m}:${s}`;
        }, 1000);
    }

    /**
     * Stop ride timer
     */
    function stopRideTimer() {
        clearInterval(rideTimer);
        rideTimer = null;
    }

    /**
     * Show the ride/dashboard view
     */
    function showRideView(statusClass, statusText) {
        document.getElementById('connect-view').classList.remove('active');
        document.getElementById('ride-view').classList.add('active');
        document.getElementById('tab-bar').classList.remove('hidden');

        const badge = document.getElementById('dash-connection-status');
        badge.className = 'status-badge ' + statusClass;
        document.getElementById('dash-status-text').textContent = statusText;
    }

    /**
     * Show the connect view
     */
    function showConnectView() {
        document.getElementById('ride-view').classList.remove('active');
        document.getElementById('connect-view').classList.add('active');
        document.getElementById('tab-bar').classList.add('hidden');

        const badge = document.getElementById('connection-status');
        badge.className = 'status-badge disconnected';
        document.getElementById('status-text').textContent = 'Disconnected';
    }

    /**
     * Handle BLE status changes
     */
    function handleBleStatus(status) {
        const badge = document.getElementById('connection-status');
        const text = document.getElementById('status-text');

        switch (status) {
            case 'scanning':
                badge.className = 'status-badge demo';
                text.textContent = 'Scanning...';
                break;
            case 'connecting':
                badge.className = 'status-badge demo';
                text.textContent = 'Connecting...';
                break;
            case 'discovering':
                badge.className = 'status-badge demo';
                text.textContent = 'Discovering services...';
                break;
            case 'connected':
                badge.className = 'status-badge connected';
                text.textContent = 'Connected';
                break;
            case 'disconnected':
                if (mode === 'ble') {
                    mode = 'idle';
                    stopRideTimer();
                    setDemoBadge(false);
                    showConnectView();
                }
                break;
        }
    }

    /**
     * Switch between tab views
     */
    function switchTab(viewId) {
        document.querySelectorAll('.view').forEach(v => v.classList.remove('active'));
        document.getElementById(viewId).classList.add('active');
        document.querySelectorAll('.tab').forEach(t => {
            t.classList.toggle('active', t.dataset.view === viewId);
        });
    }

    // Initialize on DOM ready
    document.addEventListener('DOMContentLoaded', init);

    return {
        connect,
        disconnect,
        startDemo,
        switchTab
    };
})();