const express = require('express');
const axios = require('axios');
const router = express.Router();

const HF_API_BASE = 'https://huggingface.co/api';

/**
 * 验证 Authorization 请求头中的 Bearer Token
 * 支持两种方式传递 token（兼容创空间 Header 限制）：
 * 1. Authorization: Bearer <token>
 * 2. Query: ?access_token=<token>
 */
const validateAuthHeader = (req, res, next) => {
  const authHeader = req.headers.authorization;
  let token = '';

  if (authHeader && authHeader.startsWith('Bearer ')) {
    token = authHeader.substring(7);
  } else if (req.query.access_token) {
    token = req.query.access_token;
  }

  if (!token) {
    return res.status(401).json({
      error: '缺少 access_token，可通过 Authorization 头或 ?access_token= 参数传递'
    });
  }

  req.accessToken = token;
  next();
};

// 1. 获取当前登录用户信息
router.get('/whoami', validateAuthHeader, async (req, res) => {
  try {
    const response = await axios.get(`${HF_API_BASE}/whoami-v2`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    res.json({
      status: response.status,
      data: response.data
    });
  } catch (error) {
    console.error('Error fetching whoami:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch user info',
      details: error.response?.data || error.message
    });
  }
});

// 2. 获取指定用户的模型列表
router.get('/models/:owner', validateAuthHeader, async (req, res) => {
  try {
    const { owner } = req.params;
    const pageSize = req.query.page_size || 50;
    const response = await axios.get(`${HF_API_BASE}/models?author=${owner}&limit=${pageSize}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    const models = Array.isArray(response.data) ? response.data : [];
    const processedModels = models.map(model => ({
      id: model.id,
      name: model.id,
      private: model.private || false,
      gated: model.gated || false,
      ...model
    }));

    res.json({
      total: processedModels.length,
      page_size: pageSize,
      data: processedModels
    });
  } catch (error) {
    console.error('Error fetching models:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch models',
      details: error.response?.data || error.message
    });
  }
});

// 3. 获取指定用户的数据集列表
router.get('/datasets/:owner', validateAuthHeader, async (req, res) => {
  try {
    const { owner } = req.params;
    const pageSize = req.query.page_size || 50;
    const response = await axios.get(`${HF_API_BASE}/datasets?author=${owner}&limit=${pageSize}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    const datasets = Array.isArray(response.data) ? response.data : [];
    const processedDatasets = datasets.map(dataset => ({
      id: dataset.id,
      name: dataset.id,
      private: dataset.private || false,
      gated: dataset.gated || false,
      ...dataset
    }));

    res.json({
      total: processedDatasets.length,
      page_size: pageSize,
      data: processedDatasets
    });
  } catch (error) {
    console.error('Error fetching datasets:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch datasets',
      details: error.response?.data || error.message
    });
  }
});

// 4. 获取指定用户的 Spaces 列表
router.get('/spaces/:owner', validateAuthHeader, async (req, res) => {
  try {
    const { owner } = req.params;
    const pageSize = req.query.page_size || 50;
    const response = await axios.get(`${HF_API_BASE}/spaces?author=${owner}&limit=${pageSize}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    const spaces = Array.isArray(response.data) ? response.data : [];
    const processedSpaces = spaces.map(space => ({
      id: space.id,
      name: space.id,
      sdk: space.sdk,
      ...space
    }));

    res.json({
      total: processedSpaces.length,
      page_size: pageSize,
      data: processedSpaces
    });
  } catch (error) {
    console.error('Error fetching spaces:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch spaces',
      details: error.response?.data || error.message
    });
  }
});

// 5. 获取特定模型详情
router.get('/models/:owner/:repo_name', validateAuthHeader, async (req, res) => {
  try {
    const { owner, repo_name } = req.params;
    const response = await axios.get(`${HF_API_BASE}/models/${owner}/${repo_name}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    res.json({
      status: response.status,
      data: response.data
    });
  } catch (error) {
    console.error('Error fetching model details:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch model details',
      details: error.response?.data || error.message
    });
  }
});

// 6. 获取特定数据集详情
router.get('/datasets/:owner/:repo_name', validateAuthHeader, async (req, res) => {
  try {
    const { owner, repo_name } = req.params;
    const response = await axios.get(`${HF_API_BASE}/datasets/${owner}/${repo_name}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    res.json({
      status: response.status,
      data: response.data
    });
  } catch (error) {
    console.error('Error fetching dataset details:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch dataset details',
      details: error.response?.data || error.message
    });
  }
});

// 7. 获取特定 Space 详情
router.get('/spaces/:owner/:repo_name', validateAuthHeader, async (req, res) => {
  try {
    const { owner, repo_name } = req.params;
    const response = await axios.get(`${HF_API_BASE}/spaces/${owner}/${repo_name}`, {
      headers: {
        'Authorization': `Bearer ${req.accessToken}`,
        'Content-Type': 'application/json'
      }
    });

    res.json({
      status: response.status,
      data: response.data
    });
  } catch (error) {
    console.error('Error fetching space details:', error.response?.data || error.message);
    res.status(error.response?.status || 500).json({
      error: 'Failed to fetch space details',
      details: error.response?.data || error.message
    });
  }
});

module.exports = router;