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console.log("--> SERVER STARTING...");
import express from 'express';
// --- DYNAMIC IMPORT ---
let SystemMessage, HumanMessage, AIMessage, LlamaCppLLM;
try {
    const module = await import('./src/index.js');
    SystemMessage = module.SystemMessage;
    HumanMessage = module.HumanMessage;
    AIMessage = module.AIMessage;
    LlamaCppLLM = module.LlamaCppLLM;
    console.log("--> Modules loaded successfully");
} catch (e) {
    console.error("--> FATAL IMPORT ERROR:", e);
}

import bodyParser from 'body-parser';
import fs from 'fs';
import path from 'path';

// --- CONFIGURATION ---
const PORT = 7860;
const MODEL_PATH = './models/Qwen3-1.7B-Q8_0.gguf';
const MODEL_NAME = "dahanhstd-1.0"; // Tên model tùy chỉnh

// --- LOAD PROMPTS ---
const PROMPTS = {
    "default": "You are a helpful AI assistant. Answer concisely.",
    "talk2people": fs.existsSync('MasterPrompt_Talk2People.txt') 
        ? fs.readFileSync('MasterPrompt_Talk2People.txt', 'utf-8') 
        : "You are a creative Video Director specializing in realistic Vietnamese scenes.",
    "coder": "You are an expert programmer."
};

// --- HTML TEMPLATE (GIAO DIỆN CHAT) ---
const HTML_PAGE = `
<!DOCTYPE html>
<html lang="vi">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Dạ Hành AI Studio</title>
    <style>
        :root { --primary:#00ff88; --bg:#121212; --chat-bg:#1e1e1e; --user-bg:#2a2a2a; --ai-bg:#0a3a2a; }
        body { font-family:'Segoe UI',sans-serif; background:var(--bg); color:white; margin:0; display:flex; height:100vh; overflow:hidden; }
        .sidebar { width:260px; background:#000; padding:20px; border-right:1px solid #333; display:flex; flex-direction:column; }
        .main { flex:1; display:flex; flex-direction:column; padding:20px; position:relative; }
        h1 { font-size:1.2rem; color:var(--primary); margin-bottom:20px; text-transform:uppercase; letter-spacing:1px; }
        select { width:100%; padding:12px; background:#333; color:white; border:1px solid #555; border-radius:8px; margin-bottom:20px; outline:none; }
        #chat-box { flex:1; overflow-y:auto; background:var(--chat-bg); border-radius:12px; padding:20px; margin-bottom:20px; display:flex; flex-direction:column; gap:15px; scroll-behavior:smooth; }
        .message { max-width:80%; padding:12px 18px; border-radius:18px; line-height:1.5; font-size:0.95rem; animation:fadeIn 0.3s ease; }
        .message.ai { align-self:flex-start; background:var(--ai-bg); border-bottom-left-radius:4px; }
        .message.user { align-self:flex-end; background:var(--user-bg); border-bottom-right-radius:4px; color:#ddd; }
        .input-area { display:flex; gap:10px; }
        input { flex:1; padding:15px 20px; border-radius:30px; border:1px solid #444; background:#222; color:white; outline:none; font-size:1rem; }
        input:focus { border-color:var(--primary); }
        button { padding:10px 30px; border-radius:30px; border:none; background:var(--primary); color:black; font-weight:bold; cursor:pointer; transition:0.2s; }
        button:hover { transform:scale(1.05); box-shadow:0 0 10px var(--primary); }
        .status { margin-top:auto; font-size:0.8rem; color:#666; border-top:1px solid #333; padding-top:15px; }
        @keyframes fadeIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }
        /* Scrollbar */
        ::-webkit-scrollbar { width:8px; }
        ::-webkit-scrollbar-track { background:#1e1e1e; }
        ::-webkit-scrollbar-thumb { background:#444; border-radius:4px; }
    </style>
</head>
<body>
<div class="sidebar">
    <h1>DẠ HÀNH STUDIO</h1>
    <label style="font-size:0.9rem; color:#aaa; margin-bottom:5px">Chọn Role:</label>
    <select id="role-select">
        <option value="talk2people">🎬 Đạo diễn (Talk2People)</option>
        <option value="coder">💻 Coder Expert</option>
        <option value="default">🤖 Trợ lý ảo</option>
    </select>
    <div class="status">
        Model: <b>${MODEL_NAME}</b><br>
        Privacy: <b>Local Safe</b><br>
        Status: <span id="status-text" style="color:yellow">Connecting...</span>
    </div>
</div>
<div class="main">
    <div id="chat-box"></div>
    <div class="input-area">
        <input type="text" id="user-input" placeholder="Nhập tin nhắn..." autocomplete="off">
        <button onclick="sendMessage()">GỬI</button>
    </div>
</div>
<script>
    const chatBox = document.getElementById('chat-box');
    const userInput = document.getElementById('user-input');
    const roleSelect = document.getElementById('role-select');
    const statusText = document.getElementById('status-text');
    let chatHistory = [];

    function addMessage(role, text) {
        const div = document.createElement('div');
        div.className = 'message ' + role;
        div.innerText = text;
        chatBox.appendChild(div);
        chatBox.scrollTop = chatBox.scrollHeight;
    }

    async function checkHealth() {
        try {
            const res = await fetch('/info');
            const data = await res.json();
            statusText.innerText = "Online";
            statusText.style.color = "#00ff88";
            addMessage('ai', "Xin chào đây là hệ thống bot AI hoạt động riêng tư được đào tạo bởi Dạ Hành Studio, Không phụ thuộc vào Google");
        } catch (e) {
            statusText.innerText = "Offline";
            statusText.style.color = "red";
        }
    }

    async function sendMessage() {
        const text = userInput.value.trim();
        if (!text) return;

        addMessage('user', text);
        userInput.value = '';
        chatHistory.push({ role: 'user', content: text });

        // Loading effect
        const loadingId = 'loading-' + Date.now();
        const loadingDiv = document.createElement('div');
        loadingDiv.className = 'message ai';
        loadingDiv.id = loadingId;
        loadingDiv.innerText = 'Đang suy nghĩ...';
        chatBox.appendChild(loadingDiv);
        chatBox.scrollTop = chatBox.scrollHeight;

        try {
            const response = await fetch('/chat', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({
                    message: text,
                    history: chatHistory.slice(-10),
                    role: roleSelect.value
                })
            });
            const data = await response.json();
            
            document.getElementById(loadingId).remove();
            
            if(data.error) {
                addMessage('ai', 'Lỗi: ' + data.error);
            } else {
                addMessage('ai', data.reply);
                chatHistory.push({ role: 'ai', content: data.reply });
            }
        } catch (error) {
            document.getElementById(loadingId).remove();
            addMessage('ai', 'Lỗi kết nối: ' + error.message);
        }
    }

    userInput.addEventListener('keypress', (e) => { if (e.key === 'Enter') sendMessage(); });
    roleSelect.addEventListener('change', () => { 
        chatHistory = []; 
        chatBox.innerHTML = ''; 
        addMessage('ai', "Đã chuyển sang chế độ: " + roleSelect.options[roleSelect.selectedIndex].text);
    });

    checkHealth();
</script>
</body>
</html>
`;

// --- AI ENGINE ---
let llm = null;

async function initModel() {
    if (!LlamaCppLLM) return;
    try {
        console.log('--> Loading model...');
        if (!fs.existsSync(MODEL_PATH)) {
            console.error(`--> Model not found at ${MODEL_PATH}`);
            // Fallback: check if we are in /app
            return;
        }
        llm = new LlamaCppLLM({
            modelPath: MODEL_PATH,
            temperature: 0.7, 
            maxTokens: 1024
        });
        await llm.invoke("Hello");
        console.log('--> Model loaded successfully.');
    } catch (err) {
        console.error('--> FATAL MODEL ERROR:', err.message);
    }
}

// --- SERVER SETUP ---
const app = express();
app.use(bodyParser.json());

// 1. API: CHAT (Public API for other apps)
app.post('/chat', async (req, res) => {
    // API Response Format
    const apiResponse = {
        model: MODEL_NAME,
        created: Date.now(),
        reply: "",
        error: null
    };

    if (!llm) {
        apiResponse.error = "System initializing or Model missing";
        return res.status(503).json(apiResponse);
    }

    try {
        const { message, history = [], role = 'default' } = req.body;
        const systemInstruction = PROMPTS[role] || PROMPTS['default'];
        
        const messages = [new SystemMessage(systemInstruction)];
        history.forEach(msg => {
            if (msg.role === 'user') messages.push(new HumanMessage(msg.content));
            if (msg.role === 'ai') messages.push(new AIMessage(msg.content));
        });
        messages.push(new HumanMessage(message));

        const response = await llm.invoke(messages);
        
        apiResponse.reply = response.content;
        res.json(apiResponse);

    } catch (error) {
        apiResponse.error = error.message;
        res.status(500).json(apiResponse);
    }
});

// 2. API: INFO
app.get('/info', (req, res) => {
    res.json({ 
        model: MODEL_NAME, 
        status: llm ? "ready" : "loading",
        roles: Object.keys(PROMPTS) 
    });
});

// 3. UI: HOME PAGE (Direct HTML Render)
app.get('/', (req, res) => {
    res.send(HTML_PAGE);
});

app.listen(PORT, '0.0.0.0', () => {
    console.log(`--> Server listening on ${PORT}`);
    initModel();
});