import { NextRequest, NextResponse } from 'next/server';
import { writeFile, mkdir } from 'fs/promises';
import path from 'path';

export async function POST(request: NextRequest) {
  try {
    const data = await request.formData();
    const file: File | null = data.get('file') as unknown as File;

    if (!file) {
      return NextResponse.json({ success: false, error: 'No file received' }, { status: 400 });
    }

    // Validate file type
    const allowedTypes = ['image/jpeg', 'image/jpg', 'image/png', 'image/webp'];
    if (!allowedTypes.includes(file.type)) {
      return NextResponse.json({ success: false, error: 'Invalid file type. Only JPEG, PNG, and WebP are allowed.' }, { status: 400 });
    }

    // Validate file size (5MB max)
    const maxSize = 5 * 1024 * 1024; // 5MB
    if (file.size > maxSize) {
      return NextResponse.json({ success: false, error: 'File too large. Maximum size is 5MB.' }, { status: 400 });
    }

    // Generate unique filename
    const timestamp = Date.now();
    const random = Math.random().toString(36).substring(2, 15);
    const extension = path.extname(file.name);
    const filename = `${timestamp}-${random}${extension}`;

    // Create uploads directory if it doesn't exist
    const uploadsDir = path.join(process.cwd(), 'public', 'uploads', 'products');
    await mkdir(uploadsDir, { recursive: true });

    // Convert file to buffer and save
    const bytes = await file.arrayBuffer();
    const buffer = Buffer.from(bytes);
    const filepath = path.join(uploadsDir, filename);
    await writeFile(filepath, buffer);

    // Return the public URL
    const url = `/uploads/products/${filename}`;

    return NextResponse.json({
      success: true,
      data: {
        url,
        filename,
        originalName: file.name,
        size: file.size,
        type: file.type
      }
    });

  } catch (error) {
    console.error('Error uploading file:', error);
    return NextResponse.json(
      { success: false, error: 'Failed to upload file' },
      { status: 500 }
    );
  }
}