<?php

declare(strict_types=1);

namespace App\Tests\Service;

use App\Entity\Groups\Accommodation;
use App\Entity\Groups\AccommodationBooking;
use App\Repository\Groups\AccommodationPriceRepository;
use App\Service\AccommodationBookingBreakdownCalculator;
use App\Service\GroupsPriceCalculator;
use App\Service\PriceTimelineBuilder;
use PHPUnit\Framework\TestCase;

class AccommodationBookingBreakdownCalculatorTest extends TestCase
{
    public function testComputeReturnsStoredSnapshotWithoutLoadingCurrentPrices(): void
    {
        $snapshot = ['total' => 12345, 'currency' => 'EUR'];
        $booking = new AccommodationBooking();
        $booking->setPriceSnapshot($snapshot, 12345, 'EUR', 1);

        $priceRepository = $this->createMock(AccommodationPriceRepository::class);
        $priceRepository->expects(self::never())->method('findByHotelCodeAndDateRange');

        $breakdown = $this->createCalculator($priceRepository)->compute($booking);

        self::assertSame(12345, $breakdown['total']);
        self::assertSame('EUR', $breakdown['currency']);
    }

    public function testComputeEnrichesTheStoredSnapshotWithDiscountRowsAndTotal(): void
    {
        $booking = new AccommodationBooking();
        $booking->setPriceSnapshot($this->breakdown(), 12345, 'CHF', 1);
        $booking->setAccommodationDiscount(10);

        $breakdown = $this->createCalculator()->compute($booking);

        self::assertSame([['label' => 'Unterkunft', 'percent' => 10, 'amount' => 1000]], $breakdown['discounts']);
        self::assertSame(12345 - 1000, $breakdown['discountedTotal']);
    }

    public function testWithDiscountsListsOneRowPerConfiguredDiscount(): void
    {
        $booking = new AccommodationBooking();
        $booking->setAccommodationDiscount(10);
        $booking->setBoardServiceDiscount(20);
        $booking->setAdditionalServicesDiscount(50);

        $breakdown = $this->createCalculator()->withDiscounts($booking, $this->breakdown());

        // accommodation: (8000+2000)*10% = 1000, board: 1000*20% = 200, services: 500*50% = 250
        self::assertSame([
            ['label' => 'Unterkunft', 'percent' => 10, 'amount' => 1000],
            ['label' => 'Verpflegung', 'percent' => 20, 'amount' => 200],
            ['label' => 'Zusatzleistungen', 'percent' => 50, 'amount' => 250],
        ], $breakdown['discounts']);
        self::assertSame(12345 - 1000 - 200 - 250, $breakdown['discountedTotal']);
    }

    public function testWithDiscountsRoundsToWholeCents(): void
    {
        $booking = new AccommodationBooking();
        $booking->setBoardServiceDiscount(15);

        // 333 * 15% = 49.95 — the amount has to land on whole cents, and the discounted total
        // has to be reduced by the very number that is shown on the row.
        $breakdown = $this->createCalculator()->withDiscounts($booking, ['total' => 12345, 'boardPrice' => 333]);

        self::assertSame(50, $breakdown['discounts'][0]['amount']);
        self::assertSame(12345 - 50, $breakdown['discountedTotal']);
    }

    public function testWithDiscountsSkipsDiscountsThatAmountToNothing(): void
    {
        $booking = new AccommodationBooking();
        $booking->setAccommodationDiscount(0);
        // A discount on a bucket this booking has no price in.
        $booking->setAdditionalServicesDiscount(20);

        $breakdown = $this->createCalculator()->withDiscounts($booking, [
            'total' => 12345,
            'basePrice' => 8000,
            'servicesPrice' => 0,
        ]);

        self::assertSame([], $breakdown['discounts']);
        self::assertSame(12345, $breakdown['discountedTotal']);
    }

    public function testWithoutDiscountsTheDiscountedTotalIsTheTotal(): void
    {
        $breakdown = $this->createCalculator()->withDiscounts(new AccommodationBooking(), $this->breakdown());

        self::assertSame([], $breakdown['discounts']);
        self::assertSame(12345, $breakdown['discountedTotal']);
    }

    /**
     * The derived keys must never reach the database: refreshPriceSnapshot() freezes exactly
     * what computeCurrent() returns.
     */
    public function testComputeCurrentReturnsTheRawBreakdown(): void
    {
        $booking = new AccommodationBooking();
        $booking->setAccommodationDiscount(10);
        $booking->setAccommodation((new Accommodation())->setCalendarCode('HOTEL')->setCurrency('CHF'));
        $booking->setDateFrom(new \DateTimeImmutable('2026-08-01'));
        $booking->setDateTo(new \DateTimeImmutable('2026-08-03'));

        $breakdown = $this->createCalculator()->computeCurrent($booking);

        self::assertArrayNotHasKey('discounts', $breakdown);
        self::assertArrayNotHasKey('discountedTotal', $breakdown);
    }

    /**
     * @return array<string, mixed>
     */
    private function breakdown(): array
    {
        return [
            'total' => 12345,
            'currency' => 'CHF',
            'basePrice' => 8000,
            'additionalPersonsPrice' => 2000,
            'boardPrice' => 1000,
            'servicesPrice' => 500,
        ];
    }

    private function createCalculator(?AccommodationPriceRepository $priceRepository = null): AccommodationBookingBreakdownCalculator
    {
        return new AccommodationBookingBreakdownCalculator(
            new GroupsPriceCalculator(new PriceTimelineBuilder(), [
                'runningCostsEur' => 0,
                'runningCostsChf' => 0,
                'undersubscription30Eur' => 0,
                'undersubscription30Chf' => 0,
                'undersubscription40Eur' => 0,
                'undersubscription40Chf' => 0,
            ]),
            $priceRepository ?? $this->createStub(AccommodationPriceRepository::class),
        );
    }
}