/**
 * Sync routes for Formex crawler
 */
import { sync, getSyncLogs, getMaterials } from '../services/formexCrawler.js';
import { getSchedulerStatus } from '../services/scheduler.js';
import pool, { run } from '../db/index.js';

/**
 * POST /api/sync/formex
 * Trigger a manual Formex sync (non-streaming)
 */
export async function triggerFormexSync(req, res) {
  try {
    // Run sync (this may take a while)
    const result = await sync();
    
    if (result.success) {
      res.json({
        success: true,
        message: `Synchronisation terminée: ${result.itemsCount} produits`,
        itemsCount: result.itemsCount,
        duration: result.duration
      });
    } else {
      res.status(500).json({
        success: false,
        error: result.error,
        itemsCount: result.itemsCount
      });
    }
  } catch (err) {
    res.status(500).json({
      success: false,
      error: err.message
    });
  }
}

/**
 * GET /api/sync/formex/stream
 * SSE endpoint for real-time sync progress
 */
export async function streamFormexSync(req, res) {
  // Set SSE headers
  res.setHeader('Content-Type', 'text/event-stream');
  res.setHeader('Cache-Control', 'no-cache');
  res.setHeader('Connection', 'keep-alive');
  res.setHeader('X-Accel-Buffering', 'no'); // Disable nginx buffering
  res.flushHeaders();

  // Emitter function that sends SSE events
  const emit = (data) => {
    res.write(`data: ${JSON.stringify(data)}\n\n`);
  };

  // Handle client disconnect
  req.on('close', () => {
    // Client disconnected, cleanup if needed
  });

  try {
    // Run sync with emitter
    await sync(emit);
  } catch (err) {
    emit({ type: 'error', error: err.message });
  }

  // Close connection
  res.end();
}

/**
 * GET /api/sync/logs
 * Get sync history
 */
export async function getLogs(req, res) {
  try {
    const limit = parseInt(req.query.limit || '20', 10);
    const logs = await getSyncLogs(limit);
    res.json(logs);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * GET /api/sync/status
 * Get scheduler status
 */
export function getStatus(req, res) {
  const status = getSchedulerStatus();
  res.json(status);
}

/**
 * GET /api/formex/materials
 * Get Formex materials with filtering and pagination
 */
export async function getFormexMaterials(req, res) {
  try {
    const { search, collection, category, active, page = '1', limit = '25' } = req.query;
    const pageNum = Math.max(1, parseInt(page, 10));
    const limitNum = Math.min(100, Math.max(1, parseInt(limit, 10)));
    const offset = (pageNum - 1) * limitNum;

    // Build query with optional filters
    let whereClauses = [];
    let params = [];

    if (search) {
      whereClauses.push('(name LIKE ? OR formex_code LIKE ?)');
      params.push(`%${search}%`, `%${search}%`);
    }

    if (collection) {
      whereClauses.push('collection = ?');
      params.push(collection);
    }
    
    if (category) {
      whereClauses.push('category = ?');
      params.push(category);
    }
    
    // For configurator: only active materials
    if (active === '1' || active === 'true') {
      whereClauses.push('active = 1');
    }

    const whereSQL = whereClauses.length > 0 ? `WHERE ${whereClauses.join(' AND ')}` : '';

    // Get total count
    const countResult = await pool.query(
      `SELECT COUNT(*) as total FROM formex_materials ${whereSQL}`,
      params
    );
    const total = countResult.rows[0]?.total || 0;

    // Get paginated results
    const { rows } = await pool.query(
      `SELECT * FROM formex_materials ${whereSQL} ORDER BY collection, name LIMIT ? OFFSET ?`,
      [...params, limitNum, offset]
    );

    res.json({
      materials: rows,
      pagination: {
        page: pageNum,
        limit: limitNum,
        total,
        totalPages: Math.ceil(total / limitNum)
      }
    });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * GET /api/formex/materials/:id
 * Get a single material by ID with dimensions and variants
 */
export async function getFormexMaterial(req, res) {
  try {
    const { id } = req.params;
    
    // Get main material
    const { rows } = await pool.query(
      'SELECT * FROM formex_materials WHERE id = ?',
      [id]
    );

    if (rows.length === 0) {
      return res.status(404).json({ error: 'Matériau non trouvé' });
    }

    const material = rows[0];
    
    // Get dimension variants
    const dimensions = await pool.query(
      'SELECT id, width_mm, height_mm, thickness_mm, is_default FROM formex_dimensions WHERE material_id = ? ORDER BY is_default DESC, width_mm',
      [id]
    );
    material.dimensions = dimensions.rows;
    
    // Get color/decor variants
    const variants = await pool.query(
      'SELECT id, variant_code, variant_name, variant_url, image_url FROM formex_variants WHERE material_id = ? ORDER BY variant_name',
      [id]
    );
    material.variants = variants.rows;

    res.json(material);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * POST /api/formex/materials
 * Create a new material
 */
export async function createFormexMaterial(req, res) {
  try {
    const { formex_code, name, collection, category, width_mm, height_mm, thickness_mm, image_url, formex_url, price_chf, active } = req.body;

    // Validation
    if (!formex_code || !name || !collection) {
      return res.status(400).json({ error: 'formex_code, name et collection sont requis' });
    }

    // Check for duplicate code
    const existing = await pool.query(
      'SELECT id FROM formex_materials WHERE formex_code = ?',
      [formex_code]
    );
    if (existing.rows.length > 0) {
      return res.status(409).json({ error: 'Un matériau avec ce code existe déjà' });
    }

    await run(
      `INSERT INTO formex_materials (formex_code, name, collection, category, width_mm, height_mm, thickness_mm, image_url, formex_url, price_chf, active)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
      [formex_code, name, collection, category || null, width_mm || null, height_mm || null, thickness_mm || null, 
       image_url || null, formex_url || null, price_chf || null, active !== undefined ? (active ? 1 : 0) : 1]
    );

    // Get the created material
    const { rows } = await pool.query(
      'SELECT * FROM formex_materials WHERE formex_code = ?',
      [formex_code]
    );

    res.status(201).json(rows[0]);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * PUT /api/formex/materials/:id
 * Update a material
 */
export async function updateFormexMaterial(req, res) {
  try {
    const { id } = req.params;
    const { formex_code, name, collection, category, width_mm, height_mm, thickness_mm, image_url, formex_url, price_chf, active } = req.body;

    // Check if material exists
    const existing = await pool.query(
      'SELECT * FROM formex_materials WHERE id = ?',
      [id]
    );
    if (existing.rows.length === 0) {
      return res.status(404).json({ error: 'Matériau non trouvé' });
    }

    // Validation
    if (!formex_code || !name || !collection) {
      return res.status(400).json({ error: 'formex_code, name et collection sont requis' });
    }

    // Check for duplicate code (if changed)
    if (formex_code !== existing.rows[0].formex_code) {
      const duplicate = await pool.query(
        'SELECT id FROM formex_materials WHERE formex_code = ? AND id != ?',
        [formex_code, id]
      );
      if (duplicate.rows.length > 0) {
        return res.status(409).json({ error: 'Un matériau avec ce code existe déjà' });
      }
    }

    await run(
      `UPDATE formex_materials 
       SET formex_code = ?, name = ?, collection = ?, category = ?, width_mm = ?, height_mm = ?, thickness_mm = ?, 
           image_url = ?, formex_url = ?, price_chf = ?, active = ?
       WHERE id = ?`,
      [formex_code, name, collection, category || null, width_mm || null, height_mm || null, thickness_mm || null, 
       image_url || null, formex_url || null, price_chf || null, active !== undefined ? (active ? 1 : 0) : 1, id]
    );

    // Get the updated material
    const { rows } = await pool.query(
      'SELECT * FROM formex_materials WHERE id = ?',
      [id]
    );

    res.json(rows[0]);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * DELETE /api/formex/materials/:id
 * Delete a material
 */
export async function deleteFormexMaterial(req, res) {
  try {
    const { id } = req.params;

    // Check if material exists
    const existing = await pool.query(
      'SELECT * FROM formex_materials WHERE id = ?',
      [id]
    );
    if (existing.rows.length === 0) {
      return res.status(404).json({ error: 'Matériau non trouvé' });
    }

    await run('DELETE FROM formex_materials WHERE id = ?', [id]);

    res.json({ success: true, message: 'Matériau supprimé' });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * GET /api/formex/collections
 * Get distinct collection names for filter dropdown
 */
export async function getFormexCollections(req, res) {
  try {
    const { rows } = await pool.query(
      'SELECT DISTINCT collection FROM formex_materials ORDER BY collection'
    );
    res.json(rows.map(r => r.collection));
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}

/**
 * GET /api/formex/categories
 * Get distinct category names for filter dropdown
 */
export async function getFormexCategories(req, res) {
  try {
    const { rows } = await pool.query(
      'SELECT DISTINCT category FROM formex_materials WHERE category IS NOT NULL ORDER BY category'
    );
    res.json(rows.map(r => r.category));
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
}