import express from "express";
import path from "path";
import { fileURLToPath } from "url";
import dotenv from "dotenv";
import cookieParser from "cookie-parser";
import fs from "fs"; // 使用 ESM 语法导入 fs 模块
import {
  createRepo,
  uploadFiles,
  whoAmI,
  spaceInfo,
  fileExists,
} from "@huggingface/hub";
import { InferenceClient } from "@huggingface/inference";
import bodyParser from "body-parser";

import checkUser from "./middlewares/checkUser.js";
import { 
  PROVIDERS, 
  DEFAULT_SYSTEM_PROMPT, 
  convertToOpenAIFormat,
  convertToHFFormat 
} from "./utils/providers.js";
import { COLORS } from "./utils/colors.js";

// Load environment variables from .env file
dotenv.config();

// 设置环境变量如果不存在
process.env.APP_PORT = 7860;

// 打印环境变量（排除敏感信息）
console.log('===== 环境变量 =====');
console.log('NODE_ENV:', process.env.NODE_ENV);
console.log('APP_PORT:', process.env.APP_PORT);
console.log('DEFAULT_MODEL_ID:', process.env.DEFAULT_MODEL_ID);
console.log('REDIRECT_URI:', process.env.REDIRECT_URI);
console.log('OPENAI_COMPATIBLE_ENDPOINT:', process.env.OPENAI_COMPATIBLE_ENDPOINT ? '已设置' : '未设置');
console.log('OPENAI_COMPATIBLE_MODEL_ID:', process.env.OPENAI_COMPATIBLE_MODEL_ID);
console.log('===================');

const app = express();

const ipAddresses = new Map();

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

// Hugging Face Spaces 使用 7860 端口
const PORT = 7860;
const REDIRECT_URI =
  process.env.REDIRECT_URI || `http://localhost:${PORT}/auth/login`;
const MODEL_ID = process.env.DEFAULT_MODEL_ID || "deepseek-ai/DeepSeek-V3-0324";
const MAX_REQUESTS_PER_IP = 4;

app.use((req, res, next) => {
  console.log(`收到请求: ${req.method} ${req.url}`);
  next();
});

app.use(cookieParser());
app.use(express.static(path.join(__dirname, "dist"), {
  index: false,
  setHeaders: (res, filePath) => {
    console.log(`提供静态文件: ${filePath}`);
    
    // 移除可能导致问题的安全头部
    res.removeHeader('Feature-Policy');
    res.removeHeader('Permissions-Policy');
    
    // 设置适当的内容安全策略
    res.setHeader('Content-Security-Policy', "default-src 'self' https: data: 'unsafe-inline' 'unsafe-eval';");
  }
}));
app.use(bodyParser.json());

const getPTag = (repoId) => {
  return `<p style="border-radius: 8px; text-align: center; font-size: 12px; color: #fff; margin-top: 16px;position: fixed; left: 8px; bottom: 8px; z-index: 10; background: rgba(0, 0, 0, 0.8); padding: 4px 8px;">Made with <img src="https://enzostvs-deepsite.hf.space/logo.svg" alt="DeepSite Logo" style="width: 16px; height: 16px; vertical-align: middle;display:inline-block;margin-right:3px;filter:brightness(0) invert(1);"><a href="https://enzostvs-deepsite.hf.space" style="color: #fff;text-decoration: underline;" target="_blank" >DeepSite</a> - <a href="https://enzostvs-deepsite.hf.space?remix=${repoId}" style="color: #fff;text-decoration: underline;" target="_blank" >🧬 Remix</a></p>`;
};

app.get("/api/login", (_req, res) => {
  res.redirect(
    302,
    `https://huggingface.co/oauth/authorize?client_id=${process.env.OAUTH_CLIENT_ID}&redirect_uri=${REDIRECT_URI}&response_type=code&scope=openid%20profile%20write-repos%20manage-repos%20inference-api&prompt=consent&state=1234567890`
  );
});
app.get("/auth/login", async (req, res) => {
  const { code } = req.query;

  if (!code) {
    return res.redirect(302, "/");
  }
  const Authorization = `Basic ${Buffer.from(
    `${process.env.OAUTH_CLIENT_ID}:${process.env.OAUTH_CLIENT_SECRET}`
  ).toString("base64")}`;

  const request_auth = await fetch("https://huggingface.co/oauth/token", {
    method: "POST",
    headers: {
      "Content-Type": "application/x-www-form-urlencoded",
      Authorization,
    },
    body: new URLSearchParams({
      grant_type: "authorization_code",
      code: code,
      redirect_uri: REDIRECT_URI,
    }),
  });

  const response = await request_auth.json();

  if (!response.access_token) {
    return res.redirect(302, "/");
  }

  res.cookie("hf_token", response.access_token, {
    httpOnly: false,
    secure: true,
    sameSite: "none",
    maxAge: 30 * 24 * 60 * 60 * 1000,
  });

  return res.redirect(302, "/");
});
app.get("/auth/logout", (req, res) => {
  res.clearCookie("hf_token", {
    httpOnly: false,
    secure: true,
    sameSite: "none",
  });
  return res.redirect(302, "/");
});

app.get("/api/@me", checkUser, async (req, res) => {
  const { hf_token } = req.cookies;
  try {
    const request_user = await fetch("https://huggingface.co/oauth/userinfo", {
      headers: {
        Authorization: `Bearer ${hf_token}`,
      },
    });

    const user = await request_user.json();
    res.send(user);
  } catch (err) {
    res.clearCookie("hf_token", {
      httpOnly: false,
      secure: true,
      sameSite: "none",
    });
    res.status(401).send({
      ok: false,
      message: err.message,
    });
  }
});

app.post("/api/deploy", checkUser, async (req, res) => {
  const { html, title, path } = req.body;
  if (!html || !title) {
    return res.status(400).send({
      ok: false,
      message: "Missing required fields",
    });
  }

  const { hf_token } = req.cookies;
  try {
    const repo = {
      type: "space",
      name: path ?? "",
    };

    let readme;
    let newHtml = html;

    if (!path || path === "") {
      const { name: username } = await whoAmI({ accessToken: hf_token });
      const newTitle = title
        .toLowerCase()
        .replace(/[^a-z0-9]+/g, "-")
        .split("-")
        .filter(Boolean)
        .join("-")
        .slice(0, 96);

      const repoId = `${username}/${newTitle}`;
      repo.name = repoId;

      await createRepo({
        repo,
        accessToken: hf_token,
      });
      const colorFrom = COLORS[Math.floor(Math.random() * COLORS.length)];
      const colorTo = COLORS[Math.floor(Math.random() * COLORS.length)];
      readme = `---
title: ${newTitle}
emoji: 🐳
colorFrom: ${colorFrom}
colorTo: ${colorTo}
sdk: static
pinned: false
tags:
  - deepsite
---

Check out the configuration reference at https://huggingface.co/docs/hub/spaces-config-reference`;
    }

    newHtml = html.replace(/<\/body>/, `${getPTag(repo.name)}</body>`);
    const file = new Blob([newHtml], { type: "text/html" });
    file.name = "index.html"; // Add name property to the Blob

    const files = [file];
    if (readme) {
      const readmeFile = new Blob([readme], { type: "text/markdown" });
      readmeFile.name = "README.md"; // Add name property to the Blob
      files.push(readmeFile);
    }
    await uploadFiles({
      repo,
      files,
      accessToken: hf_token,
    });
    return res.status(200).send({ ok: true, path: repo.name });
  } catch (err) {
    return res.status(500).send({
      ok: false,
      message: err.message,
    });
  }
});

// 添加OpenAI兼容的流式响应处理函数
const handleOpenAIStream = async (response, res) => {
  const reader = response.body.getReader();
  const decoder = new TextDecoder();
  let completeResponse = "";

  try {
    while (true) {
      const { done, value } = await reader.read();
      if (done) break;

      const chunk = decoder.decode(value);
      const lines = chunk.split('\n');
      
      for (const line of lines) {
        if (line.trim() === '') continue;
        if (line.trim() === 'data: [DONE]') break;
        
        if (line.startsWith('data: ')) {
          try {
            const data = JSON.parse(line.slice(6));
            const content = data.choices[0]?.delta?.content;
            if (content) {
              res.write(content);
              completeResponse += content;
              
              if (completeResponse.includes("</html>")) {
                return;
              }
            }
          } catch (e) {
            console.error('Error parsing SSE message:', e);
          }
        }
      }
    }
  } catch (error) {
    console.error('Stream reading error:', error);
    throw error;
  }
};

app.post("/api/ask-ai", async (req, res) => {
  const { prompt, html, previousPrompt, provider, customConfig } = req.body;
  if (!prompt) {
    return res.status(400).send({
      ok: false,
      message: "Missing required fields",
    });
  }

  const { hf_token } = req.cookies;
  let token = hf_token;
  const ip =
    req.headers["x-forwarded-for"]?.split(",")[0].trim() ||
    req.headers["x-real-ip"] ||
    req.socket.remoteAddress ||
    req.ip ||
    "0.0.0.0";

  if (!hf_token) {
    ipAddresses.set(ip, (ipAddresses.get(ip) || 0) + 1);
    if (ipAddresses.get(ip) > MAX_REQUESTS_PER_IP) {
      return res.status(429).send({
        ok: false,
        openLogin: true,
        message: "Log In to continue using the service",
      });
    }

    token = process.env.DEFAULT_HF_TOKEN;
  }

  // Set up response headers for streaming
  res.setHeader("Content-Type", "text/plain");
  res.setHeader("Cache-Control", "no-cache");
  res.setHeader("Connection", "keep-alive");

  let client;
  let selectedProvider;

  try {
    if (provider === "custom" && customConfig) {
      selectedProvider = {
        ...PROVIDERS.custom,
        ...customConfig,
      };

      const messages = [
        {
          role: "system",
          content: selectedProvider.systemPrompt || DEFAULT_SYSTEM_PROMPT,
        },
        ...(previousPrompt
          ? [
              {
                role: "user",
                content: previousPrompt,
              },
            ]
          : []),
        ...(html
          ? [
              {
                role: "assistant",
                content: `The current code is: ${html}.`,
              },
            ]
          : []),
        {
          role: "user",
          content: prompt,
        },
      ];

      if (selectedProvider.apiType === 'openai') {
        // 使用OpenAI兼容的API格式
        const response = await fetch(`${selectedProvider.endpoint}/v1/chat/completions`, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${selectedProvider.apiKey}`,
          },
          body: JSON.stringify(convertToOpenAIFormat(messages)),
        });

        if (!response.ok) {
          throw new Error(`API request failed with status ${response.status}`);
        }

        await handleOpenAIStream(response, res);
      } else {
        // 使用HuggingFace格式
        client = new InferenceClient({
          endpoint: selectedProvider.endpoint,
          token: selectedProvider.apiKey || token,
        });

        const chatCompletion = client.chatCompletionStream(convertToHFFormat(messages));
        let completeResponse = "";

        while (true) {
          const { done, value } = await chatCompletion.next();
          if (done) break;

          const chunk = value.choices[0]?.delta?.content;
          if (chunk) {
            res.write(chunk);
            completeResponse += chunk;

            if (completeResponse.includes("</html>")) {
              break;
            }
          }
        }
      }
    } else {
      // 使用默认配置
      client = new InferenceClient(token);
      selectedProvider = provider === "auto" 
        ? PROVIDERS.novita 
        : PROVIDERS[provider] ?? PROVIDERS.novita;

      let TOKENS_USED = prompt?.length;
      if (previousPrompt) TOKENS_USED += previousPrompt.length;
      if (html) TOKENS_USED += html.length;

      if (provider !== "auto" && TOKENS_USED >= selectedProvider.max_tokens) {
        return res.status(400).send({
          ok: false,
          openSelectProvider: true,
          message: `Context is too long. ${selectedProvider.name} allow ${selectedProvider.max_tokens} max tokens.`,
        });
      }

      const chatCompletion = client.chatCompletionStream({
        model: selectedProvider.model_id || MODEL_ID,
        provider: selectedProvider.id,
        messages: [
          {
            role: "system",
            content: selectedProvider.systemPrompt || DEFAULT_SYSTEM_PROMPT,
          },
          ...(previousPrompt
            ? [
                {
                  role: "user",
                  content: previousPrompt,
                },
              ]
            : []),
          ...(html
            ? [
                {
                  role: "assistant",
                  content: `The current code is: ${html}.`,
                },
              ]
            : []),
          {
            role: "user",
            content: prompt,
          },
        ],
        ...(selectedProvider.id !== "sambanova" && selectedProvider.max_tokens
          ? {
              max_tokens: selectedProvider.max_tokens,
            }
          : {}),
      });

      let completeResponse = "";
      while (true) {
        const { done, value } = await chatCompletion.next();
        if (done) {
          break;
        }
        const chunk = value.choices[0]?.delta?.content;
        if (chunk) {
          if (provider !== "sambanova") {
            res.write(chunk);
            completeResponse += chunk;

            if (completeResponse.includes("</html>")) {
              break;
            }
          } else {
            let newChunk = chunk;
            if (chunk.includes("</html>")) {
              newChunk = newChunk.replace(/<\/html>[\s\S]*/, "</html>");
            }
            completeResponse += newChunk;
            res.write(newChunk);
            if (newChunk.includes("</html>")) {
              break;
            }
          }
        }
      }
    }

    res.end();
  } catch (error) {
    if (!res.headersSent) {
      res.status(500).send({
        ok: false,
        message: error.message || "An error occurred while processing your request.",
      });
    } else {
      res.end();
    }
  }
});

app.post("/api/custom-model", checkUser, async (req, res) => {
  const { 
    endpoint, 
    apiKey, 
    model_id, 
    max_tokens, 
    name, 
    systemPrompt,
    apiType = 'hf' // 默认使用HuggingFace格式
  } = req.body;
  
  if (!endpoint || !model_id) {
    return res.status(400).send({
      ok: false,
      message: "Missing required fields: endpoint and model_id",
    });
  }

  try {
    // 验证端点可用性
    if (apiType === 'openai') {
      // 验证OpenAI兼容的API端点
      const response = await fetch(`${endpoint}/v1/chat/completions`, {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${apiKey}`,
        },
        body: JSON.stringify({
          model: model_id,
          messages: [{ role: "system", content: "Hello" }],
          max_tokens: 1,
        }),
      });

      if (!response.ok) {
        throw new Error(`API endpoint validation failed: ${response.statusText}`);
      }
    } else {
      // 验证HuggingFace格式的端点
      const client = new InferenceClient({
        endpoint,
        token: apiKey,
      });
      await client.ping();
    }

    // 更新自定义提供商配置
    PROVIDERS.custom = {
      ...PROVIDERS.custom,
      endpoint,
      model_id,
      apiKey,
      apiType,
      max_tokens: max_tokens || 0,
      name: name || "自定义模型",
      systemPrompt: systemPrompt || DEFAULT_SYSTEM_PROMPT,
    };

    res.status(200).send({
      ok: true,
      message: "Custom model configured successfully",
      provider: PROVIDERS.custom,
    });
  } catch (error) {
    res.status(500).send({
      ok: false,
      message: error.message || "Failed to configure custom model",
    });
  }
});

app.get("/api/remix/:username/:repo", async (req, res) => {
  const { username, repo } = req.params;
  const { hf_token } = req.cookies;

  const token = hf_token || process.env.DEFAULT_HF_TOKEN;

  const repoId = `${username}/${repo}`;
  const space = await spaceInfo({
    name: repoId,
  });

  console.log(space);

  if (!space || space.sdk !== "static" || space.private) {
    return res.status(404).send({
      ok: false,
      message: "Space not found",
    });
  }

  const url = `https://huggingface.co/spaces/${repoId}/raw/main/index.html`;
  const response = await fetch(url);
  if (!response.ok) {
    return res.status(404).send({
      ok: false,
      message: "Space not found",
    });
  }
  let html = await response.text();
  // remove the last p tag including this url https://enzostvs-deepsite.hf.space
  html = html.replace(getPTag(repoId), "");

  res.status(200).send({
    ok: true,
    html,
  });
});

// 添加根路由的专门处理
app.get("/", (req, res) => {
  console.log("接收到根路径请求");
  console.log("请求头:", req.headers);
  
  // 直接提供简单的页面而不是依赖构建的应用
  res.send(`
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DeepSite - AI驱动的前端助手</title>
  <style>
    html, body {
      height: 100%;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }
    body {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      background: #f0f2f5;
      color: #333;
      text-align: center;
      padding: 20px;
    }
    .container {
      background: white;
      border-radius: 10px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
      padding: 40px;
      max-width: 700px;
      width: 100%;
    }
    h1 {
      margin-top: 0;
      color: #0066cc;
      font-size: 32px;
    }
    p {
      line-height: 1.6;
      font-size: 16px;
    }
    .features {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 20px;
      margin: 30px 0;
    }
    .feature {
      background: #f8f9fa;
      border-radius: 8px;
      padding: 15px;
      width: 180px;
    }
    .feature h3 {
      margin-top: 0;
      color: #0066cc;
    }
    .buttons {
      display: flex;
      gap: 15px;
      justify-content: center;
      margin-top: 30px;
    }
    .button {
      display: inline-block;
      background-color: #0066cc;
      color: white;
      padding: 12px 24px;
      border-radius: 6px;
      text-decoration: none;
      font-weight: bold;
      transition: background-color 0.3s;
    }
    .button:hover {
      background-color: #0052a3;
    }
    .button.secondary {
      background-color: #f0f2f5;
      color: #333;
    }
    .button.secondary:hover {
      background-color: #e0e2e5;
    }
    .footer {
      margin-top: 40px;
      font-size: 14px;
      color: #666;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>DeepSite</h1>
    <p>一个强大的 AI 驱动的前端开发助手，帮助你快速创建和优化网页。现在支持自定义模型和 OpenAI 兼容 API。</p>
    
    <div class="features">
      <div class="feature">
        <h3>🎨 智能UI生成</h3>
        <p>快速生成美观的用户界面</p>
      </div>
      <div class="feature">
        <h3>🔧 代码优化</h3>
        <p>智能优化和改进代码</p>
      </div>
      <div class="feature">
        <h3>🚀 实时预览</h3>
        <p>即时查看设计效果</p>
      </div>
      <div class="feature">
        <h3>🔄 自定义模型</h3>
        <p>支持接入自定义AI模型</p>
      </div>
    </div>
    
    <div class="buttons">
      <a href="/api/login" class="button">登录使用</a>
      <a href="https://github.com/luoluoluo22/deepsite-space" class="button secondary">查看源码</a>
    </div>
    
    <div class="footer">
      <p>当前服务器时间: ${new Date().toLocaleString('zh-CN')}</p>
      <p>服务器状态: 正常运行中</p>
      <p>系统版本: DeepSite 1.0.0</p>
    </div>
  </div>
</body>
</html>
  `);
});

// 将 /debug 路由放到开头部分（在其他路由之前）
// 添加调试路由
app.get("/debug", (req, res) => {
  console.log("处理 /debug 请求");
  const info = {
    env: process.env.NODE_ENV,
    port: PORT,
    time: new Date().toISOString(),
    static_dir: path.join(__dirname, "dist"),
    files: fs.readdirSync(path.join(__dirname, "dist")),
    headers: req.headers,
    cookies: req.cookies
  };
  
  // 禁用缓存
  res.setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, proxy-revalidate');
  res.setHeader('Pragma', 'no-cache');
  res.setHeader('Expires', '0');
  res.setHeader('Surrogate-Control', 'no-store');
  
  // 设置内容类型为 JSON
  res.setHeader('Content-Type', 'application/json');
  res.send(JSON.stringify(info, null, 2));
});

// 修改通配符路由，排除 /debug 路径
app.get("*", (req, res) => {
  // 跳过 /debug 请求
  if (req.url === '/debug') {
    return;
  }
  
  console.log(`通配符路由请求: ${req.url}`);
  const indexPath = path.join(__dirname, "dist", "index.html");
  
  if (fs.existsSync(indexPath)) {
    console.log(`通配符路由提供 index.html: ${indexPath}`);
    res.sendFile(indexPath);
  } else {
    console.error(`通配符路由错误: index.html 文件不存在: ${indexPath}`);
    res.status(404).send("找不到页面文件");
  }
});

// 在 app.listen 之前添加
// 确保 dist 目录和 index.html 存在
const distDir = path.join(__dirname, "dist");
const indexPath = path.join(distDir, "index.html");

if (!fs.existsSync(distDir)) {
  console.log("创建 dist 目录");
  fs.mkdirSync(distDir, { recursive: true });
}

// 修改 createBasicHtml 函数，创建一个更基础的 HTML 页面
const createBasicHtml = () => {
  return `
<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>DeepSite</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      height: 100vh;
      margin: 0;
      padding: 20px;
      text-align: center;
      background-color: #f5f5f5;
    }
    .container {
      max-width: 800px;
      padding: 30px;
      background-color: white;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
      border-radius: 8px;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>欢迎使用 DeepSite</h1>
    <p>一个强大的 AI 驱动的前端开发助手</p>
    <p>正在加载中...</p>
    <p><a href="/" id="refresh">刷新页面</a></p>
    <div id="debug"></div>
    <script>
      // 简单的调试脚本
      document.getElementById('debug').innerHTML = '浏览器信息: ' + navigator.userAgent;
      
      // 5秒后自动刷新
      setTimeout(() => {
        window.location.reload();
      }, 5000);
    </script>
  </div>
</body>
</html>
  `;
};

// 在检查 index.html 不存在时使用新的函数
if (!fs.existsSync(indexPath)) {
  console.log("创建基本的 index.html 文件");
  fs.writeFileSync(indexPath, createBasicHtml());
}

app.listen(PORT, () => {
  console.log(`===== 应用启动信息 =====`);
  console.log(`启动时间: ${new Date().toISOString()}`);
  console.log(`运行环境: ${process.env.NODE_ENV || 'development'}`);
  console.log(`服务器启动在端口: ${PORT}`);
  console.log(`默认模型: ${MODEL_ID}`);
  console.log(`静态文件目录: ${path.join(__dirname, "dist")}`);
  
  // 检查静态文件是否存在
  const indexPath = path.join(__dirname, "dist", "index.html");
  if (fs.existsSync(indexPath)) {
    console.log(`index.html 文件存在: ${indexPath}`);
  } else {
    console.error(`错误: index.html 文件不存在: ${indexPath}`);
    console.log(`目录内容: ${fs.readdirSync(path.join(__dirname, "dist")).join(', ') || '空目录'}`);
  }
  
  console.log(`=======================`);
});