import express from 'express';
import db from '../database.js';
import { authenticateToken } from '../middleware/auth.js';
import axios from 'axios';
import * as cheerio from 'cheerio';
import fs from 'fs';
import path from 'path';
import { v4 as uuidv4 } from 'uuid';
import { generateThumbnail } from '../services/thumbnailGenerator.js';

const router = express.Router();

// Import from URL (Thingiverse, Printables, MakerWorld)
router.post('/url', authenticateToken, async (req, res) => {
  const { url } = req.body;

  if (!url) {
    return res.status(400).json({ error: 'URL is required' });
  }

  try {
    let modelData;

    if (url.includes('thingiverse.com')) {
      modelData = await scrapeThingiverse(url);
    } else if (url.includes('printables.com')) {
      modelData = await scrapePrintables(url);
    } else if (url.includes('makerworld.com')) {
      modelData = await scrapeMakerWorld(url);
    } else {
      return res.status(400).json({ error: 'Unsupported URL. Only Thingiverse, Printables, and MakerWorld are supported.' });
    }

    if (!modelData) {
      return res.status(500).json({ error: 'Failed to extract model data from URL' });
    }

    // Download the model file if available
    let filePath = null;
    let fileName = null;
    let fileType = null;
    let fileSize = null;
    let thumbnailPath = null;

    if (modelData.downloadUrl) {
      const uploadDir = process.env.UPLOAD_DIR || './uploads';
      const filesDir = path.join(uploadDir, 'files');
      if (!fs.existsSync(filesDir)) {
        fs.mkdirSync(filesDir, { recursive: true });
      }

      try {
        const response = await axios.get(modelData.downloadUrl, {
          responseType: 'arraybuffer',
          headers: {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
          },
          maxRedirects: 5
        });

        fileType = path.extname(modelData.fileName || '.stl').toLowerCase();
        fileName = `${uuidv4()}${fileType}`;
        filePath = path.join(filesDir, fileName);

        fs.writeFileSync(filePath, response.data);
        fileSize = fs.statSync(filePath).size;

        // Generate thumbnail
        if (['.stl', '.3mf', '.obj'].includes(fileType)) {
          try {
            thumbnailPath = await generateThumbnail(filePath, fileType);
          } catch (error) {
            console.error('Error generating thumbnail:', error);
          }
        }
      } catch (error) {
        console.error('Error downloading file:', error);
        // Continue without file
      }
    }

    // Insert into database
    db.run(
      `INSERT INTO models (name, description, file_path, file_name, file_size, file_type, preview_image, creator, source_url, user_id)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      [
        modelData.name,
        modelData.description,
        filePath,
        fileName || modelData.fileName,
        fileSize,
        fileType,
        thumbnailPath,
        modelData.creator,
        url,
        req.user.id
      ],
      function(err) {
        if (err) {
          // Clean up files if database insert fails
          if (filePath && fs.existsSync(filePath)) {
            fs.unlinkSync(filePath);
          }
          if (thumbnailPath && fs.existsSync(thumbnailPath)) {
            fs.unlinkSync(thumbnailPath);
          }
          return res.status(500).json({ error: err.message });
        }

        res.json({
          message: 'Model imported successfully',
          modelId: this.lastID,
          hasFile: !!filePath
        });
      }
    );
  } catch (error) {
    console.error('Import error:', error);
    res.status(500).json({ error: 'Failed to import model: ' + error.message });
  }
});

// Scrape Thingiverse
async function scrapeThingiverse(url) {
  try {
    const response = await axios.get(url, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
      }
    });

    const $ = cheerio.load(response.data);

    const name = $('h1[itemprop="name"]').text().trim() || $('h1.thing-name').text().trim();
    const description = $('div[itemprop="description"]').text().trim() || $('div.thing-description').text().trim();
    const creator = $('a[itemprop="author"] span[itemprop="name"]').text().trim() || $('a.creator-name').text().trim();

    // Note: Actual file download from Thingiverse requires authentication
    // This is a placeholder - in practice, users would need to download manually
    const downloadUrl = null;
    const fileName = null;

    return {
      name: name || 'Imported from Thingiverse',
      description: description || 'No description available',
      creator: creator || 'Unknown',
      downloadUrl,
      fileName
    };
  } catch (error) {
    console.error('Thingiverse scrape error:', error);
    return null;
  }
}

// Scrape Printables
async function scrapePrintables(url) {
  try {
    const response = await axios.get(url, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
      }
    });

    const $ = cheerio.load(response.data);

    const name = $('h1.main-title').text().trim() || $('h1').first().text().trim();
    const description = $('div.description').text().trim();
    const creator = $('a.user-link').first().text().trim();

    // Note: Actual file download requires authentication
    const downloadUrl = null;
    const fileName = null;

    return {
      name: name || 'Imported from Printables',
      description: description || 'No description available',
      creator: creator || 'Unknown',
      downloadUrl,
      fileName
    };
  } catch (error) {
    console.error('Printables scrape error:', error);
    return null;
  }
}

// Scrape MakerWorld
async function scrapeMakerWorld(url) {
  try {
    const response = await axios.get(url, {
      headers: {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36'
      }
    });

    const $ = cheerio.load(response.data);

    // MakerWorld uses React, so scraping is limited
    // Try to extract from meta tags
    const name = $('meta[property="og:title"]').attr('content') || $('title').text();
    const description = $('meta[property="og:description"]').attr('content');
    const creator = 'MakerWorld User';

    const downloadUrl = null;
    const fileName = null;

    return {
      name: name || 'Imported from MakerWorld',
      description: description || 'No description available',
      creator,
      downloadUrl,
      fileName
    };
  } catch (error) {
    console.error('MakerWorld scrape error:', error);
    return null;
  }
}

export default router;