<?php

declare(strict_types=1);

namespace App\Tests\Service;

use App\BusProNet\Constants;
use App\BusProNet\Model\Room;
use App\BusProNet\Model\Travel;
use App\BusProNet\Service\BookingStatusRuleRegistry;
use App\BusProNet\XmlLoader\AgencyLoader;
use App\Form\Model\BookingDto;
use App\Form\Model\RoomSelectionDto;
use App\Service\BookingConfigurator;
use App\Service\BookingSessionManager;
use App\Service\ParticipantEligibilityChecker;
use App\Service\TravelDataProvider;
use PHPUnit\Framework\TestCase;

class BookingConfiguratorRoomReconciliationTest extends TestCase
{
    public function testKeepsQuantitiesOfRoomsThatAreStillBookable(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 4, minPax: 2),
            $this->createRoom(1409, 'Einzelzimmer', available: 2, minPax: 1),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 2),
            1409 => $this->createRoomSelection(1409, quantity: 0),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertSame([], $adjustments);
        $this->assertSame([1408, 1409], array_keys($bookingDto->roomSelections));
        $this->assertSame(2, $bookingDto->roomSelections[1408]->quantity);
        $this->assertSame(0, $bookingDto->roomSelections[1409]->quantity);
        $this->assertSame(2, $bookingDto->roomSelections[1408]->capacity);
        $this->assertSame(4, $bookingDto->roomSelections[1408]->maxQuantity);
    }

    public function testReportsAndRemovesASelectedRoomThatIsNoLongerBookable(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 0, minPax: 2),
            $this->createRoom(1409, 'Einzelzimmer', available: 2, minPax: 1),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 2),
            1409 => $this->createRoomSelection(1409, quantity: 0),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertCount(1, $adjustments);
        $this->assertSame(1408, $adjustments[0]->roomId);
        $this->assertSame(2, $adjustments[0]->requestedQuantity);
        $this->assertSame(0, $adjustments[0]->bookableQuantity);
        $this->assertTrue($adjustments[0]->isDropped());
        $this->assertSame([1409], array_keys($bookingDto->roomSelections));
    }

    public function testCapsAQuantityThatExceedsTheRemainingContingent(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 1, minPax: 2),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 3),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertCount(1, $adjustments);
        $this->assertSame(1408, $adjustments[0]->roomId);
        $this->assertSame('Aus der Session', $adjustments[0]->label);
        $this->assertSame(3, $adjustments[0]->requestedQuantity);
        $this->assertSame(1, $adjustments[0]->bookableQuantity);
        $this->assertFalse($adjustments[0]->isDropped());
        $this->assertSame(1, $bookingDto->roomSelections[1408]->quantity, 'The selection carries the capped quantity');
        $this->assertSame(1, $bookingDto->roomSelections[1408]->maxQuantity);
    }

    public function testLeavesAQuantityThatStillFitsTheReducedContingent(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 2, minPax: 2),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 2),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertSame([], $adjustments);
        $this->assertSame(2, $bookingDto->roomSelections[1408]->quantity);
    }

    public function testRemovesAnUnselectedRoomThatIsNoLongerBookableWithoutReportingIt(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 4, minPax: 2),
            $this->createRoom(1409, 'Einzelzimmer', available: 0, minPax: 1),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 1),
            1409 => $this->createRoomSelection(1409, quantity: 0),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertSame([], $adjustments);
        $this->assertSame([1408], array_keys($bookingDto->roomSelections));
    }

    public function testAddsARoomThatBecameBookableAgain(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 4, minPax: 2),
            $this->createRoom(1409, 'Einzelzimmer', available: 2, minPax: 1),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 1),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertSame([], $adjustments);
        $this->assertSame([1408, 1409], array_keys($bookingDto->roomSelections));
        $this->assertSame(0, $bookingDto->roomSelections[1409]->quantity);
        $this->assertSame('Einzelzimmer', $bookingDto->roomSelections[1409]->label);
    }

    public function testEmptiesTheSelectionsWhenTheTravelSoldOutCompletely(): void
    {
        $travel = $this->createTravel([
            $this->createRoom(1408, 'Doppelzimmer', available: 0, minPax: 2),
        ]);

        $bookingDto = new BookingDto($travel, 1);
        $bookingDto->roomSelections = [
            1408 => $this->createRoomSelection(1408, quantity: 2),
        ];

        $adjustments = $this->bookingService()->reconcileRoomSelections($bookingDto);

        $this->assertCount(1, $adjustments);
        $this->assertTrue($adjustments[0]->isDropped());
        $this->assertSame([], $bookingDto->roomSelections);
    }

    private function bookingService(): BookingConfigurator
    {
        return new BookingConfigurator(
            $this->createStub(BookingSessionManager::class),
            $this->createStub(TravelDataProvider::class),
            $this->createStub(ParticipantEligibilityChecker::class),
            $this->createStub(BookingStatusRuleRegistry::class),
            $this->createStub(AgencyLoader::class),
            'F'
        );
    }

    /**
     * @param array<int, Room> $rooms
     */
    private function createTravel(array $rooms): Travel
    {
        $travel = new Travel();
        $travel->id = 4711;
        $travel->code = 'TRV-4711';
        $travel->rooms = $rooms;

        return $travel;
    }

    private function createRoom(int $id, string $label, int $available, int $minPax): Room
    {
        $room = new Room();
        $room->id = $id;
        $room->label = $label;
        $room->available = $available;
        $room->minPax = $minPax;
        $room->status = Constants::STATUS_AVAILABLE;
        $room->price = 199.0;

        return $room;
    }

    private function createRoomSelection(int $id, int $quantity): RoomSelectionDto
    {
        $selection = new RoomSelectionDto();
        $selection->id = $id;
        $selection->label = 'Aus der Session';
        $selection->quantity = $quantity;
        $selection->capacity = 2;
        $selection->maxQuantity = 9;

        return $selection;
    }
}