import { NextRequest, NextResponse } from 'next/server';
import { getDatabase } from '@/db';

/**
 * GET /api/clusters/[id]/photos
 * Get all photos from cluster libraries with pagination
 */
export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ id: string }> }
) {
  try {
    const { id } = await params;
    const { searchParams } = new URL(request.url);
    const db = getDatabase();
    const clusterId = parseInt(id);
    
    const limit = parseInt(searchParams.get('limit') || '50');
    const offset = parseInt(searchParams.get('offset') || '0');
    const search = searchParams.get('search');
    
    if (isNaN(clusterId)) {
      return NextResponse.json({ error: 'Invalid cluster ID' }, { status: 400 });
    }
    
    // Check cluster exists
    const cluster = db.prepare('SELECT * FROM clusters WHERE id = ?').get(clusterId);
    if (!cluster) {
      return NextResponse.json({ error: 'Cluster not found' }, { status: 404 });
    }
    
    let query = `
      SELECT m.*, l.path as library_path
      FROM media m
      INNER JOIN libraries l ON m.library_id = l.id
      INNER JOIN library_cluster_mapping lcm ON l.id = lcm.library_id
      WHERE lcm.cluster_id = ? AND m.type = 'photo'
    `;
    
    const params: any[] = [clusterId];
    
    if (search) {
      query += ' AND (m.title LIKE ? OR m.path LIKE ?)';
      params.push(`%${search}%`, `%${search}%`);
    }
    
    query += ' ORDER BY m.created_at DESC LIMIT ? OFFSET ?';
    params.push(limit, offset);
    
    const photos = db.prepare(query).all(...params);
    
    // Get total count
    let countQuery = `
      SELECT COUNT(*) as count
      FROM media m
      INNER JOIN libraries l ON m.library_id = l.id
      INNER JOIN library_cluster_mapping lcm ON l.id = lcm.library_id
      WHERE lcm.cluster_id = ? AND m.type = 'photo'
    `;
    
    const countParams: any[] = [clusterId];
    
    if (search) {
      countQuery += ' AND (m.title LIKE ? OR m.path LIKE ?)';
      countParams.push(`%${search}%`, `%${search}%`);
    }
    
    const { count } = db.prepare(countQuery).get(...countParams) as { count: number };
    
    return NextResponse.json({
      photos,
      total: count,
      limit,
      offset,
      hasMore: offset + photos.length < count
    });
  } catch (error: any) {
    console.error('Error fetching cluster photos:', error);
    return NextResponse.json(
      { error: error.message },
      { status: 500 }
    );
  }
}