// MacroPad PWA Application (Execute-only)

class MacroPadApp {
    constructor() {
        this.macros = {};
        this.tabs = [];
        this.currentTab = 'All';
        this.ws = null;
        this.wakeLock = null;

        // Relay mode detection
        this.relayMode = this.detectRelayMode();
        this.sessionId = null;
        this.password = null;
        this.desktopConnected = true;
        this.wsAuthenticated = false;

        if (this.relayMode) {
            this.initRelayMode();
        }

        this.init();
    }

    detectRelayMode() {
        // Check if URL matches relay pattern: /sessionId/app or /sessionId
        const pathMatch = window.location.pathname.match(/^\/([a-zA-Z0-9]{4,12})(\/app)?$/);
        return pathMatch !== null;
    }

    initRelayMode() {
        // Extract session ID from URL
        const pathMatch = window.location.pathname.match(/^\/([a-zA-Z0-9]{4,12})/);
        if (pathMatch) {
            this.sessionId = pathMatch[1];
        }

        // Get password from URL query param or sessionStorage
        const urlParams = new URLSearchParams(window.location.search);
        this.password = urlParams.get('auth') || sessionStorage.getItem(`macropad_${this.sessionId}`);

        if (this.password) {
            // Store password for future use
            sessionStorage.setItem(`macropad_${this.sessionId}`, this.password);
            // Clear from URL for security
            if (urlParams.has('auth')) {
                window.history.replaceState({}, '', window.location.pathname);
            }
        }

        console.log('Relay mode enabled, session:', this.sessionId);
    }

    getApiUrl(path) {
        if (this.relayMode && this.sessionId) {
            return `/${this.sessionId}${path}`;
        }
        return path;
    }

    getApiHeaders() {
        const headers = { 'Content-Type': 'application/json' };
        if (this.relayMode && this.password) {
            headers['X-MacroPad-Password'] = this.password;
        }
        return headers;
    }

    async init() {
        await this.loadTabs();
        await this.loadMacros();
        this.setupWebSocket();
        this.setupEventListeners();
        this.setupWakeLock();
        this.checkInstallPrompt();
    }

    // API Methods
    async loadTabs() {
        try {
            const response = await fetch(this.getApiUrl('/api/tabs'), {
                headers: this.getApiHeaders()
            });
            if (!response.ok) {
                if (response.status === 401) {
                    this.handleAuthError();
                    return;
                }
                throw new Error('Failed to load tabs');
            }
            const data = await response.json();
            this.tabs = data.tabs || [];
            this.renderTabs();
        } catch (error) {
            console.error('Error loading tabs:', error);
            this.showToast('Error loading tabs', 'error');
        }
    }

    async loadMacros() {
        try {
            const path = this.currentTab === 'All'
                ? '/api/macros'
                : `/api/macros/${encodeURIComponent(this.currentTab)}`;
            const response = await fetch(this.getApiUrl(path), {
                headers: this.getApiHeaders()
            });
            if (!response.ok) {
                if (response.status === 401) {
                    this.handleAuthError();
                    return;
                }
                if (response.status === 503) {
                    this.handleDesktopDisconnected();
                    return;
                }
                throw new Error('Failed to load macros');
            }
            const data = await response.json();
            this.macros = data.macros || {};
            this.renderMacros();
        } catch (error) {
            console.error('Error loading macros:', error);
            this.showToast('Error loading macros', 'error');
        }
    }

    async executeMacro(macroId) {
        try {
            const card = document.querySelector(`[data-macro-id="${macroId}"]`);
            if (card) card.classList.add('executing');

            const response = await fetch(this.getApiUrl('/api/execute'), {
                method: 'POST',
                headers: this.getApiHeaders(),
                body: JSON.stringify({ macro_id: macroId })
            });

            if (!response.ok) {
                if (response.status === 503) {
                    this.handleDesktopDisconnected();
                }
                throw new Error('Execution failed');
            }

            setTimeout(() => {
                if (card) card.classList.remove('executing');
            }, 300);
        } catch (error) {
            console.error('Error executing macro:', error);
            this.showToast('Error executing macro', 'error');
        }
    }

    handleAuthError() {
        this.showToast('Authentication failed', 'error');
        if (this.relayMode) {
            // Clear stored password and redirect to login
            sessionStorage.removeItem(`macropad_${this.sessionId}`);
            window.location.href = `/${this.sessionId}`;
        }
    }

    handleDesktopDisconnected() {
        this.desktopConnected = false;
        this.updateConnectionStatus(false, 'Desktop offline');
        this.showToast('Desktop app is not connected', 'error');
    }

    // WebSocket
    setupWebSocket() {
        const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
        let wsUrl;

        if (this.relayMode && this.sessionId) {
            wsUrl = `${protocol}//${window.location.host}/${this.sessionId}/ws`;
        } else {
            wsUrl = `${protocol}//${window.location.host}/ws`;
        }

        try {
            this.ws = new WebSocket(wsUrl);

            this.ws.onopen = () => {
                if (!this.relayMode) {
                    this.updateConnectionStatus(true);
                }
                // In relay mode, wait for auth before showing connected
            };

            this.ws.onclose = () => {
                this.wsAuthenticated = false;
                this.updateConnectionStatus(false);
                setTimeout(() => this.setupWebSocket(), 3000);
            };

            this.ws.onmessage = (event) => {
                const data = JSON.parse(event.data);
                this.handleWebSocketMessage(data);
            };

            this.ws.onerror = () => {
                this.updateConnectionStatus(false);
            };
        } catch (error) {
            console.error('WebSocket error:', error);
        }
    }

    handleWebSocketMessage(data) {
        switch (data.type) {
            // Relay-specific messages
            case 'auth_required':
                // Send authentication
                if (this.password) {
                    this.ws.send(JSON.stringify({
                        type: 'auth',
                        password: this.password
                    }));
                }
                break;

            case 'auth_response':
                if (data.success) {
                    this.wsAuthenticated = true;
                    this.updateConnectionStatus(this.desktopConnected);
                } else {
                    this.handleAuthError();
                }
                break;

            case 'desktop_status':
                this.desktopConnected = data.status === 'connected';
                this.updateConnectionStatus(this.desktopConnected);
                if (!this.desktopConnected) {
                    this.showToast('Desktop disconnected', 'error');
                } else {
                    this.showToast('Desktop connected', 'success');
                    this.loadTabs();
                    this.loadMacros();
                }
                break;

            // Standard MacroPad messages
            case 'macro_created':
            case 'macro_updated':
            case 'macro_deleted':
                this.loadTabs();
                this.loadMacros();
                break;

            case 'executed':
                const card = document.querySelector(`[data-macro-id="${data.macro_id}"]`);
                if (card) {
                    card.classList.add('executing');
                    setTimeout(() => card.classList.remove('executing'), 300);
                }
                break;

            case 'pong':
                // Keep-alive response
                break;
        }
    }

    updateConnectionStatus(connected, customText = null) {
        const dot = document.querySelector('.status-dot');
        const text = document.querySelector('.connection-status span');
        if (dot) {
            dot.classList.toggle('connected', connected);
        }
        if (text) {
            if (customText) {
                text.textContent = customText;
            } else if (this.relayMode) {
                text.textContent = connected ? 'Connected (Relay)' : 'Disconnected';
            } else {
                text.textContent = connected ? 'Connected' : 'Disconnected';
            }
        }
    }

    // Rendering
    renderTabs() {
        const container = document.getElementById('tabs-container');
        if (!container) return;

        container.innerHTML = this.tabs.map(tab => `
            <button class="tab ${tab === this.currentTab ? 'active' : ''}"
                    data-tab="${tab}">${tab}</button>
        `).join('');
    }

    renderMacros() {
        const container = document.getElementById('macro-grid');
        if (!container) return;

        const macroEntries = Object.entries(this.macros);

        if (macroEntries.length === 0) {
            container.innerHTML = `
                <div class="empty-state">
                    <p>No macros found</p>
                    <p class="hint">Create macros in the desktop app</p>
                </div>
            `;
            return;
        }

        container.innerHTML = macroEntries.map(([id, macro]) => {
            const imageSrc = macro.image_path
                ? `/api/image/${macro.image_path}`
                : null;
            const firstChar = macro.name.charAt(0).toUpperCase();

            return `
                <div class="macro-card" data-macro-id="${id}" onclick="app.executeMacro('${id}')">
                    ${imageSrc
                        ? `<img src="${imageSrc}" alt="${macro.name}" class="macro-image" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">`
                        : ''
                    }
                    <div class="macro-image-placeholder" ${imageSrc ? 'style="display:none"' : ''}>
                        ${firstChar}
                    </div>
                    <span class="macro-name">${macro.name}</span>
                </div>
            `;
        }).join('');
    }

    // Event Listeners
    setupEventListeners() {
        // Tab clicks
        document.getElementById('tabs-container')?.addEventListener('click', (e) => {
            if (e.target.classList.contains('tab')) {
                this.currentTab = e.target.dataset.tab;
                this.renderTabs();
                this.loadMacros();
            }
        });
    }

    // Toast notifications
    showToast(message, type = 'info') {
        const container = document.getElementById('toast-container');
        if (!container) return;

        const toast = document.createElement('div');
        toast.className = `toast ${type}`;
        toast.textContent = message;
        container.appendChild(toast);

        setTimeout(() => {
            toast.remove();
        }, 3000);
    }

    // PWA Install Prompt
    checkInstallPrompt() {
        let deferredPrompt;

        window.addEventListener('beforeinstallprompt', (e) => {
            e.preventDefault();
            deferredPrompt = e;
            this.showInstallBanner(deferredPrompt);
        });
    }

    showInstallBanner(deferredPrompt) {
        const banner = document.createElement('div');
        banner.className = 'install-banner';
        banner.innerHTML = `
            <span>Install MacroPad for quick access</span>
            <div>
                <button onclick="app.installPWA()">Install</button>
                <button class="dismiss" onclick="this.parentElement.parentElement.remove()">X</button>
            </div>
        `;
        document.body.insertBefore(banner, document.body.firstChild);
        this.deferredPrompt = deferredPrompt;
    }

    async installPWA() {
        if (!this.deferredPrompt) return;

        this.deferredPrompt.prompt();
        const { outcome } = await this.deferredPrompt.userChoice;

        if (outcome === 'accepted') {
            document.querySelector('.install-banner')?.remove();
        }

        this.deferredPrompt = null;
    }

    // Refresh
    refresh() {
        this.loadTabs();
        this.loadMacros();
    }

    // Fullscreen
    toggleFullscreen() {
        if (!document.fullscreenElement) {
            document.documentElement.requestFullscreen().catch(err => {
                console.log('Fullscreen error:', err);
            });
        } else {
            document.exitFullscreen();
        }
    }

    // Wake Lock - prevents screen from sleeping
    async setupWakeLock() {
        const status = document.getElementById('wake-lock-status');

        if (!('wakeLock' in navigator)) {
            console.log('Wake Lock API not supported');
            // Don't remove the icon - show it as unsupported instead
            if (status) {
                status.classList.add('unsupported');
                status.title = 'Wake lock not available (requires HTTPS)';
            }
            return;
        }

        // Make the icon clickable to toggle wake lock
        if (status) {
            status.style.cursor = 'pointer';
            status.addEventListener('click', () => this.toggleWakeLock());
        }

        // Request wake lock automatically
        await this.requestWakeLock();

        // Re-acquire wake lock when page becomes visible again
        document.addEventListener('visibilitychange', async () => {
            if (document.visibilityState === 'visible' && this.wakeLockEnabled) {
                await this.requestWakeLock();
            }
        });
    }

    async toggleWakeLock() {
        if (this.wakeLock) {
            // Release wake lock
            await this.wakeLock.release();
            this.wakeLock = null;
            this.wakeLockEnabled = false;
            this.updateWakeLockStatus(false);
            this.showToast('Screen can now sleep', 'info');
        } else {
            // Request wake lock
            this.wakeLockEnabled = true;
            await this.requestWakeLock();
            if (this.wakeLock) {
                this.showToast('Screen will stay awake', 'success');
            }
        }
    }

    async requestWakeLock() {
        try {
            this.wakeLock = await navigator.wakeLock.request('screen');
            this.wakeLockEnabled = true;
            this.updateWakeLockStatus(true);

            this.wakeLock.addEventListener('release', () => {
                this.updateWakeLockStatus(false);
            });
        } catch (err) {
            console.log('Wake Lock error:', err);
            this.updateWakeLockStatus(false);
            // Show error only if user explicitly tried to enable
            const status = document.getElementById('wake-lock-status');
            if (status && !status.classList.contains('unsupported')) {
                status.title = 'Wake lock failed: ' + err.message;
            }
        }
    }

    updateWakeLockStatus(active) {
        const status = document.getElementById('wake-lock-status');
        if (status) {
            status.classList.toggle('active', active);
            if (!status.classList.contains('unsupported')) {
                status.title = active ? 'Screen will stay on (click to toggle)' : 'Screen may sleep (click to enable)';
            }
        }
    }
}

// Initialize app
let app;
document.addEventListener('DOMContentLoaded', () => {
    app = new MacroPadApp();
});

// Register service worker
if ('serviceWorker' in navigator) {
    window.addEventListener('load', () => {
        navigator.serviceWorker.register('/service-worker.js')
            .then((registration) => {
                console.log('SW registered:', registration.scope);
            })
            .catch((error) => {
                console.log('SW registration failed:', error);
            });
    });
}