<?php

namespace App\Http\Controllers;

use App\Models\Booking;
use App\Models\Invoice;
use App\Models\RoomAvailability;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class InvoiceController extends Controller
{
    
    public function generate(Request $request, $bookingId)
    {
        $booking = Booking::findOrFail($bookingId);

        if ($booking->status === 'cancelled') {
            return response()->json(['error' => 'Cannot generate invoice for cancelled booking'], 400);
        }

        $totalAmount = 0;
        $currentDate = new \DateTime($booking->check_in);
        $endDate = new \DateTime($booking->check_out);

        while ($currentDate < $endDate) {
            $date = $currentDate->format('Y-m-d');

            $availability = RoomAvailability::where('room_type_id', $booking->room_type_id)
                ->where('date', $date)
                ->first();

            $price = $availability && $availability->price_override !== null
                ? $availability->price_override
                : $booking->roomType->base_price;

            $totalAmount += $price;

            $currentDate->modify('+1 day');
        }

        DB::beginTransaction();

        try {
            $invoice = Invoice::create([
                'booking_id' => $booking->id,
                'total_amount' => $totalAmount,
                'status' => 'pending',
            ]);

           
            $pdfPath = $this->generatePdf($invoice);

            if ($pdfPath) {
                $invoice->update(['pdf_path' => $pdfPath]);
            }

            DB::commit();

            return response()->json($invoice, 201);
        } catch (\Exception $e) {
            DB::rollback();
            throw $e;
        }
    }

    
    private function generatePdf($invoice)
    {

        $pdf = \PDF::loadView('invoices.show', compact('invoice'));

        $fileName = "invoice_{$invoice->id}.pdf";
        $path = "invoices/{$fileName}";

        Storage::put($path, $pdf->output());

        return $path;
    }
}