import { NextRequest, NextResponse } from 'next/server';
import { purchaseDb } from '@/lib/db';
import { Purchase } from '@/lib/types';

// GET - Get all purchases
export async function GET(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const albumId = searchParams.get('albumId');

    let purchases;
    if (albumId) {
      purchases = purchaseDb.getByAlbumId(albumId);
    } else {
      purchases = purchaseDb.getAll();
    }

    return NextResponse.json(purchases, { status: 200 });
  } catch (error) {
    console.error('Error fetching purchases:', error);
    return NextResponse.json(
      { error: 'Failed to fetch purchases' },
      { status: 500 }
    );
  }
}

// POST - Create new purchase
export async function POST(request: NextRequest) {
  try {
    const purchaseData: Omit<Purchase, 'id'> = await request.json();

    // Validate required fields
    if (!purchaseData.albumId || !purchaseData.transactionId) {
      return NextResponse.json(
        { error: 'Missing required fields' },
        { status: 400 }
      );
    }

    // Check if transaction ID already exists
    const existing = purchaseDb.getByTransactionId(purchaseData.transactionId);
    if (existing) {
      return NextResponse.json(
        { error: 'Transaction ID already exists' },
        { status: 409 }
      );
    }

    // Ensure purchaseDate is set
    const purchase: Omit<Purchase, 'id'> = {
      ...purchaseData,
      purchaseDate: purchaseData.purchaseDate || new Date(),
    };

    const created = purchaseDb.create(purchase);
    return NextResponse.json(created, { status: 201 });
  } catch (error) {
    console.error('Error creating purchase:', error);
    return NextResponse.json(
      { error: 'Failed to create purchase' },
      { status: 500 }
    );
  }
}

// DELETE - Delete purchase
export async function DELETE(request: NextRequest) {
  try {
    const { searchParams } = new URL(request.url);
    const id = searchParams.get('id');

    if (!id) {
      return NextResponse.json(
        { error: 'Purchase ID is required' },
        { status: 400 }
      );
    }

    purchaseDb.delete(parseInt(id));
    return NextResponse.json({ message: 'Purchase deleted successfully' }, { status: 200 });
  } catch (error) {
    console.error('Error deleting purchase:', error);
    return NextResponse.json(
      { error: 'Failed to delete purchase' },
      { status: 500 }
    );
  }
}