const express = require('express');
const router = express.Router();
const Portfolio = require('../models/Portfolio');

// Get all portfolio items
router.get('/', async (req, res) => {
  try {
    const page = parseInt(req.query.page) || 1;
    const limit = parseInt(req.query.limit) || 12;
    const skip = (page - 1) * limit;
    const category = req.query.category;
    const search = req.query.search;
    const featured = req.query.featured;

    // Build query
    let query = { isPublished: true };
    
    if (category && category !== 'all') {
      query.category = category;
    }
    
    if (featured === 'true') {
      query.featured = true;
    }
    
    if (search) {
      query.$text = { $search: search };
    }

    // Get portfolio items
    const [portfolio, total] = await Promise.all([
      Portfolio.find(query)
        .sort({ featured: -1, publishedAt: -1 })
        .skip(skip)
        .limit(limit)
        .select('title shortDescription category technologies images status publishedAt viewCount'),
      Portfolio.countDocuments(query)
    ]);

    const totalPages = Math.ceil(total / limit);

    res.json({
      success: true,
      portfolio,
      pagination: {
        current: page,
        total: totalPages,
        limit,
        totalItems: total,
        hasNext: page < totalPages,
        hasPrev: page > 1
      }
    });
  } catch (error) {
    console.error('Portfolio API error:', error);
    res.status(500).json({
      success: false,
      message: 'Error fetching portfolio'
    });
  }
});

// Get single portfolio item
router.get('/:id', async (req, res) => {
  try {
    const portfolio = await Portfolio.findById(req.params.id);
    
    if (!portfolio || !portfolio.isPublished) {
      return res.status(404).json({
        success: false,
        message: 'Portfolio item not found'
      });
    }

    // Increment view count
    portfolio.viewCount += 1;
    await portfolio.save();

    // Get related projects
    const relatedProjects = await Portfolio.find({
      _id: { $ne: portfolio._id },
      category: portfolio.category,
      isPublished: true
    })
    .select('title shortDescription images')
    .limit(4);

    res.json({
      success: true,
      portfolio,
      relatedProjects
    });
  } catch (error) {
    console.error('Portfolio detail API error:', error);
    res.status(500).json({
      success: false,
      message: 'Error fetching portfolio item'
    });
  }
});

// Get portfolio categories
router.get('/meta/categories', async (req, res) => {
  try {
    const categories = await Portfolio.distinct('category', { isPublished: true });
    
    // Get count for each category
    const categoriesWithCount = await Promise.all(
      categories.map(async (category) => {
        const count = await Portfolio.countDocuments({ 
          category, 
          isPublished: true 
        });
        return { category, count };
      })
    );

    res.json({
      success: true,
      categories: categoriesWithCount
    });
  } catch (error) {
    console.error('Portfolio categories API error:', error);
    res.status(500).json({
      success: false,
      message: 'Error fetching categories'
    });
  }
});

// Like portfolio item
router.post('/:id/like', async (req, res) => {
  try {
    const portfolio = await Portfolio.findById(req.params.id);
    
    if (!portfolio || !portfolio.isPublished) {
      return res.status(404).json({
        success: false,
        message: 'Portfolio item not found'
      });
    }

    portfolio.likes += 1;
    await portfolio.save();

    res.json({
      success: true,
      likes: portfolio.likes
    });
  } catch (error) {
    console.error('Portfolio like API error:', error);
    res.status(500).json({
      success: false,
      message: 'Error liking portfolio item'
    });
  }
});

// Search portfolio
router.get('/search/:term', async (req, res) => {
  try {
    const searchTerm = req.params.term;
    const limit = parseInt(req.query.limit) || 10;

    const portfolio = await Portfolio.find({
      $and: [
        { isPublished: true },
        {
          $or: [
            { title: { $regex: searchTerm, $options: 'i' } },
            { description: { $regex: searchTerm, $options: 'i' } },
            { technologies: { $in: [new RegExp(searchTerm, 'i')] } }
          ]
        }
      ]
    })
    .select('title shortDescription category images')
    .sort({ featured: -1, publishedAt: -1 })
    .limit(limit);

    res.json({
      success: true,
      portfolio,
      searchTerm,
      count: portfolio.length
    });
  } catch (error) {
    console.error('Portfolio search API error:', error);
    res.status(500).json({
      success: false,
      message: 'Error searching portfolio'
    });
  }
});

module.exports = router;