document.addEventListener('DOMContentLoaded', async () => {
    let currentUser = null;
    let supabase;
    let ws;
    let pingInterval;
    
    // --- 0. INIT ---
    try {
        const config = await (await fetch('/api/config')).json();
        supabase = window.supabase.createClient(config.supabase_url, config.supabase_key);
    } catch(e) { console.error("Config failed", e); }

    // --- 1. LOGIN ---
    document.getElementById('login-form').addEventListener('submit', async (e) => {
        e.preventDefault();
        const u = document.getElementById('login-user').value.trim();
        const p = document.getElementById('login-pass').value.trim();
        
        const { data: user } = await supabase.from('users').select('*').eq('username', u).single();
        
        if (user && dcodeIO.bcrypt.compareSync(p, user.password_hash)) {
            currentUser = user;
            document.getElementById('login-modal').classList.remove('open');
            document.getElementById('app-interface').classList.remove('hidden');
            document.getElementById('current-username').textContent = user.username;
            
            // Инициализация чекбокса настроек
            document.getElementById('setting-discovery').checked = user.is_looking_for_friends || false;
            
            initApp();
        } else {
            const err = document.getElementById('login-error');
            err.textContent = "INVALID ACCESS"; err.classList.remove('hidden');
        }
    });

    // --- 2. TABS LOGIC ---
    const navBtns = document.querySelectorAll('.nav-btn[data-tab]');
    const viewChats = document.getElementById('view-chats');
    const viewDiscovery = document.getElementById('view-discovery');
    const sidebarTitle = document.getElementById('sidebar-title');

    navBtns.forEach(btn => {
        btn.addEventListener('click', () => {
            // Remove active class
            navBtns.forEach(b => b.classList.remove('active'));
            btn.classList.add('active');
            
            const tab = btn.dataset.tab;
            if (tab === 'chats') {
                viewChats.classList.remove('hidden');
                viewDiscovery.classList.add('hidden');
                sidebarTitle.textContent = "CHANNELS";
            } else if (tab === 'discovery') {
                viewChats.classList.add('hidden');
                viewDiscovery.classList.remove('hidden');
                sidebarTitle.textContent = "FIND FRIENDS";
                loadDiscoveryUsers();
            }
        });
    });

    // --- 3. DISCOVERY & SETTINGS ---
    const settingsModal = document.getElementById('settings-modal');
    document.getElementById('open-settings').addEventListener('click', () => settingsModal.classList.add('open'));
    
    document.getElementById('save-settings').addEventListener('click', async () => {
        const isLooking = document.getElementById('setting-discovery').checked;
        
        // Update DB
        await supabase.from('users').update({ is_looking_for_friends: isLooking }).eq('id', currentUser.id);
        currentUser.is_looking_for_friends = isLooking; // local update
        
        settingsModal.classList.remove('open');
        if(isLooking) alert("You are now visible in Discovery!");
    });

    async function loadDiscoveryUsers() {
        const list = document.getElementById('discovery-list');
        list.innerHTML = '<div class="text-white/30 text-xs italic">Scanning sector...</div>';
        
        const { data: users } = await supabase
            .from('users')
            .select('*')
            .eq('is_looking_for_friends', true)
            .neq('username', currentUser.username); // Exclude self
            
        list.innerHTML = '';
        if (!users || users.length === 0) {
            list.innerHTML = '<div class="text-white/30 text-xs p-2">No signals found.</div>';
            return;
        }

        users.forEach(u => {
            const div = document.createElement('div');
            div.className = 'flex items-center justify-between p-2 bg-white/5 rounded hover:bg-white/10 transition cursor-pointer';
            div.innerHTML = `
                <div class="flex items-center gap-2">
                    <div class="w-6 h-6 rounded-full bg-gray-500"></div>
                    <span class="text-sm font-bold">${u.username}</span>
                </div>
                <button class="text-[10px] border border-cyan-400 text-cyan-400 px-2 py-1 rounded hover:bg-cyan-400 hover:text-black">
                    CONNECT
                </button>
            `;
            // Logic for "Connect" -> Create DM channel would go here
            list.appendChild(div);
        });
    }

    // --- 4. ADMIN & CHAT ---
    // (Admin Logic code from previous answer remains similar but linked to new modals)
    document.getElementById('admin-trigger').addEventListener('click', () => {
        document.getElementById('admin-modal').classList.add('open');
    });
    
    document.getElementById('admin-code').addEventListener('input', (e) => {
        if(e.target.value.length >= 4) {
             document.getElementById('admin-create-form').classList.remove('hidden');
        }
    });

    document.getElementById('admin-create-form').addEventListener('submit', async (e) => {
        e.preventDefault();
        const code = document.getElementById('admin-code').value;
        const newU = document.getElementById('new-user').value;
        const newP = document.getElementById('new-pass').value;
        
        try {
            const res = await fetch('/api/admin/create_user', {
                method: 'POST', headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({admin_code: code, new_username: newU, new_password: newP})
            });
            if(!res.ok) throw new Error("DENIED");
            const data = await res.json();
            
            await supabase.from('users').insert({
                username: data.username,
                password_hash: data.password_hash,
                badge: "BETA"
            });
            alert("CREATED");
            document.getElementById('admin-modal').classList.remove('open');
        } catch(e) { alert("ACCESS DENIED"); }
    });

    // --- 5. APP INIT & WEBSOCKET FIX ---
    function initApp() {
        const msgContainer = document.getElementById('messages-container');
        
        // Load Chat History
        supabase.from('messages').select('*').eq('channel_id', 'general').order('created_at')
            .then(({data}) => { if(data) data.forEach(renderMessage); });

        // Realtime Subscription
        supabase.channel('public:messages')
            .on('postgres_changes', { event: 'INSERT', schema: 'public', table: 'messages' }, payload => {
                if(payload.new.channel_id === 'general') renderMessage(payload.new);
            })
            .subscribe();

        // WebSocket for Voice/Signaling
        connectWebSocket();
    }

    function connectWebSocket() {
        // Secure WebSocket handling for HF Spaces
        const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
        // Remove trailing slash if present
        const host = window.location.host;
        const wsUrl = `${protocol}//${host}/ws/signal`;
        
        console.log("Attempting WS connect to:", wsUrl);
        
        ws = new WebSocket(wsUrl);
        ws.onopen = () => console.log("Signal Line Established");
        ws.onerror = (e) => console.log("Signal Error (Ignore if not using Voice)", e);
    }

    const chatForm = document.getElementById('chat-form');
    chatForm.addEventListener('submit', async (e) => {
        e.preventDefault();
        const inp = document.getElementById('msg-input');
        const text = inp.value.trim();
        if(!text) return;
        inp.value = '';

        const moodRes = await fetch('/api/analyze_mood', {
            method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({text})
        });
        const mood = await moodRes.json();

        await supabase.from('messages').insert({
            content: text, user_id: currentUser.id, username: currentUser.username,
            mood_color: mood.mood_color, channel_id: 'general'
        });
    });

    function renderMessage(msg) {
        const div = document.createElement('div');
        const isOwn = msg.username === currentUser.username;
        div.className = `flex gap-2 mb-4 ${isOwn ? 'flex-row-reverse' : ''} px-4`;
        div.innerHTML = `
            <div class="bg-white/5 border border-white/5 p-3 rounded-xl max-w-[80%] text-sm" 
                 style="border-left: 3px solid ${msg.mood_color}">
                <div class="text-[10px] text-white/40 mb-1">${msg.username}</div>
                ${msg.content}
            </div>
        `;
        const c = document.getElementById('messages-container');
        c.appendChild(div);
        c.scrollTop = c.scrollHeight;
    }
});