const express = require('express');
const { Pool } = require('pg');
const cors = require('cors');
const bcrypt = require('bcryptjs');
const jwt = require('jsonwebtoken');
require('dotenv').config();

const app = express();
const PORT = process.env.PORT || 80;

// PostgreSQL connection
const pool = new Pool({
  connectionString: process.env.DATABASE_URL,
  ssl: process.env.DATABASE_URL?.includes('amazonaws.com') ? { rejectUnauthorized: false } : false
});

// Middleware
app.use(cors({
  origin: true, // Allow all origins in development
  credentials: true,
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization'],
  exposedHeaders: ['Content-Length', 'Content-Type'],
  maxAge: 86400
}));
app.use(express.json());

// Handle preflight requests
app.options('*', cors());

// Health check route
app.get('/', (req, res) => {
  res.json({ status: 'ok', service: 'Filamenteka API' });
});

// JWT middleware
const authenticateToken = (req, res, next) => {
  const authHeader = req.headers['authorization'];
  const token = authHeader && authHeader.split(' ')[1];
  
  if (!token) {
    return res.status(401).json({ error: 'Unauthorized' });
  }
  
  jwt.verify(token, process.env.JWT_SECRET || 'your-secret-key', (err, user) => {
    if (err) {
      console.error('JWT verification error:', err);
      return res.status(403).json({ error: 'Invalid token' });
    }
    req.user = user;
    next();
  });
};

// Auth endpoints
app.post('/api/login', async (req, res) => {
  const { username, password } = req.body;
  
  // For now, simple hardcoded admin check
  if (username === 'admin' && password === process.env.ADMIN_PASSWORD) {
    const token = jwt.sign({ username }, process.env.JWT_SECRET || 'your-secret-key', { expiresIn: '24h' });
    res.json({ token });
  } else {
    res.status(401).json({ error: 'Invalid credentials' });
  }
});

// Colors endpoints
app.get('/api/colors', async (req, res) => {
  try {
    const result = await pool.query('SELECT * FROM colors ORDER BY name');
    res.json(result.rows);
  } catch (error) {
    console.error('Error fetching colors:', error);
    res.status(500).json({ error: 'Failed to fetch colors' });
  }
});

app.post('/api/colors', authenticateToken, async (req, res) => {
  const { name, hex, cena_refill, cena_spulna } = req.body;
  
  try {
    const result = await pool.query(
      'INSERT INTO colors (name, hex, cena_refill, cena_spulna) VALUES ($1, $2, $3, $4) RETURNING *',
      [name, hex, cena_refill || 3499, cena_spulna || 3999]
    );
    res.json(result.rows[0]);
  } catch (error) {
    console.error('Error creating color:', error);
    res.status(500).json({ error: 'Failed to create color' });
  }
});

app.put('/api/colors/:id', authenticateToken, async (req, res) => {
  const { id } = req.params;
  const { name, hex, cena_refill, cena_spulna } = req.body;
  
  try {
    const result = await pool.query(
      'UPDATE colors SET name = $1, hex = $2, cena_refill = $3, cena_spulna = $4, updated_at = CURRENT_TIMESTAMP WHERE id = $5 RETURNING *',
      [name, hex, cena_refill || 3499, cena_spulna || 3999, id]
    );
    res.json(result.rows[0]);
  } catch (error) {
    console.error('Error updating color:', error);
    res.status(500).json({ error: 'Failed to update color' });
  }
});

app.delete('/api/colors/:id', authenticateToken, async (req, res) => {
  const { id } = req.params;
  
  try {
    await pool.query('DELETE FROM colors WHERE id = $1', [id]);
    res.json({ success: true });
  } catch (error) {
    console.error('Error deleting color:', error);
    res.status(500).json({ error: 'Failed to delete color' });
  }
});

// Filaments endpoints (PUBLIC - no auth required)
app.get('/api/filaments', async (req, res) => {
  try {
    const result = await pool.query('SELECT * FROM filaments ORDER BY created_at DESC');
    res.json(result.rows);
  } catch (error) {
    console.error('Error fetching filaments:', error);
    res.status(500).json({ error: 'Failed to fetch filaments' });
  }
});

app.post('/api/filaments', authenticateToken, async (req, res) => {
  const { tip, finish, boja, boja_hex, refill, spulna, cena } = req.body;
  
  try {
    // Ensure refill and spulna are numbers
    const refillNum = parseInt(refill) || 0;
    const spulnaNum = parseInt(spulna) || 0;
    const kolicina = refillNum + spulnaNum;
    
    const result = await pool.query(
      `INSERT INTO filaments (tip, finish, boja, boja_hex, refill, spulna, kolicina, cena) 
       VALUES ($1, $2, $3, $4, $5, $6, $7, $8) RETURNING *`,
      [tip, finish, boja, boja_hex, refillNum, spulnaNum, kolicina, cena]
    );
    res.json(result.rows[0]);
  } catch (error) {
    console.error('Error creating filament:', error);
    res.status(500).json({ error: 'Failed to create filament' });
  }
});

app.put('/api/filaments/:id', authenticateToken, async (req, res) => {
  const { id } = req.params;
  const { tip, finish, boja, boja_hex, refill, spulna, cena, sale_percentage, sale_active, sale_start_date, sale_end_date } = req.body;
  
  try {
    // Ensure refill and spulna are numbers
    const refillNum = parseInt(refill) || 0;
    const spulnaNum = parseInt(spulna) || 0;
    const kolicina = refillNum + spulnaNum;
    
    const result = await pool.query(
      `UPDATE filaments 
       SET tip = $1, finish = $2, boja = $3, boja_hex = $4, 
           refill = $5, spulna = $6, kolicina = $7, cena = $8,
           sale_percentage = $9, sale_active = $10, 
           sale_start_date = $11, sale_end_date = $12,
           updated_at = CURRENT_TIMESTAMP
       WHERE id = $13 RETURNING *`,
      [tip, finish, boja, boja_hex, refillNum, spulnaNum, kolicina, cena, 
       sale_percentage || 0, sale_active || false, sale_start_date, sale_end_date, id]
    );
    res.json(result.rows[0]);
  } catch (error) {
    console.error('Error updating filament:', error);
    res.status(500).json({ error: 'Failed to update filament' });
  }
});

app.delete('/api/filaments/:id', authenticateToken, async (req, res) => {
  const { id } = req.params;
  
  try {
    await pool.query('DELETE FROM filaments WHERE id = $1', [id]);
    res.json({ success: true });
  } catch (error) {
    console.error('Error deleting filament:', error);
    res.status(500).json({ error: 'Failed to delete filament' });
  }
});

// Bulk sale update endpoint
app.post('/api/filaments/sale/bulk', authenticateToken, async (req, res) => {
  const { filamentIds, salePercentage, saleStartDate, saleEndDate, enableSale } = req.body;
  
  try {
    let query;
    let params;
    
    if (filamentIds && filamentIds.length > 0) {
      // Update specific filaments
      query = `
        UPDATE filaments 
        SET sale_percentage = $1, 
            sale_active = $2,
            sale_start_date = $3,
            sale_end_date = $4,
            updated_at = CURRENT_TIMESTAMP
        WHERE id = ANY($5) 
        RETURNING *`;
      params = [salePercentage || 0, enableSale || false, saleStartDate, saleEndDate, filamentIds];
    } else {
      // Update all filaments
      query = `
        UPDATE filaments 
        SET sale_percentage = $1, 
            sale_active = $2,
            sale_start_date = $3,
            sale_end_date = $4,
            updated_at = CURRENT_TIMESTAMP
        RETURNING *`;
      params = [salePercentage || 0, enableSale || false, saleStartDate, saleEndDate];
    }
    
    const result = await pool.query(query, params);
    res.json({ 
      success: true, 
      updatedCount: result.rowCount,
      updatedFilaments: result.rows 
    });
  } catch (error) {
    console.error('Error updating sale:', error);
    res.status(500).json({ error: 'Failed to update sale' });
  }
});

// Color request endpoints

// Get all color requests (admin only)
app.get('/api/color-requests', authenticateToken, async (req, res) => {
  try {
    const result = await pool.query(
      'SELECT * FROM color_requests ORDER BY created_at DESC'
    );
    res.json(result.rows);
  } catch (error) {
    console.error('Error fetching color requests:', error);
    res.status(500).json({ error: 'Failed to fetch color requests' });
  }
});

// Submit a new color request (public)
app.post('/api/color-requests', async (req, res) => {
  try {
    const { 
      color_name, 
      material_type, 
      finish_type, 
      user_email, 
      user_name, 
      description,
      reference_url 
    } = req.body;

    // Check if similar request already exists
    const existingRequest = await pool.query(
      `SELECT id, request_count FROM color_requests 
       WHERE LOWER(color_name) = LOWER($1) 
       AND material_type = $2 
       AND (finish_type = $3 OR (finish_type IS NULL AND $3 IS NULL))
       AND status = 'pending'`,
      [color_name, material_type, finish_type]
    );

    if (existingRequest.rows.length > 0) {
      // Increment request count for existing request
      const result = await pool.query(
        `UPDATE color_requests 
         SET request_count = request_count + 1,
             updated_at = CURRENT_TIMESTAMP
         WHERE id = $1
         RETURNING *`,
        [existingRequest.rows[0].id]
      );
      res.json({ 
        message: 'Your request has been added to an existing request for this color',
        request: result.rows[0] 
      });
    } else {
      // Create new request
      const result = await pool.query(
        `INSERT INTO color_requests 
         (color_name, material_type, finish_type, user_email, user_name, description, reference_url)
         VALUES ($1, $2, $3, $4, $5, $6, $7)
         RETURNING *`,
        [color_name, material_type, finish_type, user_email, user_name, description, reference_url]
      );
      res.json({ 
        message: 'Color request submitted successfully',
        request: result.rows[0] 
      });
    }
  } catch (error) {
    console.error('Error creating color request:', error);
    res.status(500).json({ error: 'Failed to submit color request' });
  }
});

// Update color request status (admin only)
app.put('/api/color-requests/:id', authenticateToken, async (req, res) => {
  try {
    const { id } = req.params;
    const { status, admin_notes } = req.body;
    
    const result = await pool.query(
      `UPDATE color_requests 
       SET status = $1, 
           admin_notes = $2,
           processed_at = CURRENT_TIMESTAMP,
           processed_by = $3,
           updated_at = CURRENT_TIMESTAMP
       WHERE id = $4
       RETURNING *`,
      [status, admin_notes, req.user.username, id]
    );
    
    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'Color request not found' });
    }
    
    res.json(result.rows[0]);
  } catch (error) {
    console.error('Error updating color request:', error);
    res.status(500).json({ error: 'Failed to update color request' });
  }
});

// Delete color request (admin only)
app.delete('/api/color-requests/:id', authenticateToken, async (req, res) => {
  try {
    const { id } = req.params;
    
    const result = await pool.query(
      'DELETE FROM color_requests WHERE id = $1 RETURNING *',
      [id]
    );
    
    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'Color request not found' });
    }
    
    res.json({ message: 'Color request deleted successfully' });
  } catch (error) {
    console.error('Error deleting color request:', error);
    res.status(500).json({ error: 'Failed to delete color request' });
  }
});

app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});