<?php

declare(strict_types=1);

namespace AutoStore\Tests\Unit;

use AutoStore\Application\Commands\HandleExpiredItems;
use AutoStore\Application\Interfaces\IItemRepository;
use AutoStore\Application\Interfaces\IOrderService;
use AutoStore\Application\Interfaces\ITimeProvider;
use AutoStore\Application\Exceptions\ApplicationException;
use AutoStore\Domain\Entities\Item;
use AutoStore\Domain\Exceptions\DomainException;
use AutoStore\Domain\Specifications\ItemExpirationSpec;
use AutoStore\Domain\Specifications\Specification;
use DateTimeImmutable;
use PHPUnit\Framework\TestCase;
use Psr\Log\LoggerInterface;

class HandleExpiredItemsTest extends TestCase
{
    private const MOCKED_NOW = '2023-01-01 12:00:00';
    private const EXPIRED_DATE = '2022-12-31 12:00:00';
    private const NOT_EXPIRED_DATE = '2023-01-02 12:00:00';
    private const ITEM_ID_1 = 'expired-item-id-1';
    private const ITEM_ID_2 = 'expired-item-id-2';
    private const ITEM_NAME_1 = 'Expired Item 1';
    private const ITEM_NAME_2 = 'Expired Item 2';
    private const ORDER_URL_1 = 'http://example.com/order1';
    private const ORDER_URL_2 = 'http://example.com/order2';
    private const USER_ID_1 = 'test-user-id-1';
    private const USER_ID_2 = 'test-user-id-2';

    private HandleExpiredItems $handleExpiredItems;
    private IItemRepository&\PHPUnit\Framework\MockObject\MockObject $itemRepository;
    private IOrderService&\PHPUnit\Framework\MockObject\MockObject $orderService;
    private ITimeProvider&\PHPUnit\Framework\MockObject\MockObject $timeProvider;
    private ItemExpirationSpec&\PHPUnit\Framework\MockObject\MockObject $expirationSpec;
    private LoggerInterface&\PHPUnit\Framework\MockObject\MockObject $logger;
    private DateTimeImmutable $fixedCurrentTime;

    protected function setUp(): void
    {
        $this->itemRepository = $this->createMock(IItemRepository::class);
        $this->orderService = $this->createMock(IOrderService::class);
        $this->timeProvider = $this->createMock(ITimeProvider::class);
        $this->expirationSpec = $this->createMock(ItemExpirationSpec::class);
        $this->logger = $this->createMock(LoggerInterface::class);

        $this->fixedCurrentTime = new DateTimeImmutable(self::MOCKED_NOW);
        $this->timeProvider->method('now')->willReturn($this->fixedCurrentTime);

        $this->handleExpiredItems = new HandleExpiredItems(
            $this->itemRepository,
            $this->orderService,
            $this->timeProvider,
            $this->expirationSpec,
            $this->logger
        );
    }

    private function createExpiredItem1(): Item
    {
        return new Item(
            self::ITEM_ID_1,
            self::ITEM_NAME_1,
            new DateTimeImmutable(self::EXPIRED_DATE),
            self::ORDER_URL_1,
            self::USER_ID_1
        );
    }

    private function createExpiredItem2(): Item
    {
        return new Item(
            self::ITEM_ID_2,
            self::ITEM_NAME_2,
            new DateTimeImmutable(self::EXPIRED_DATE),
            self::ORDER_URL_2,
            self::USER_ID_2
        );
    }

    public function testWhenNoExpiredItemsExistThenNoOrdersPlaced(): void
    {
        // Given
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn(new Specification([]));

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn([]);

        $this->orderService->expects($this->never())->method('orderItem');
        $this->itemRepository->expects($this->never())->method('delete');
        $this->logger->expects($this->never())->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenExpiredItemsExistThenOrdersPlacedAndItemsDeleted(): void
    {
        // Given
        $expiredItem1 = $this->createExpiredItem1();
        $expiredItem2 = $this->createExpiredItem2();
        $expiredItems = [$expiredItem1, $expiredItem2];

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn($expiredItems);
        $this->orderService->expects($this->exactly(2))
            ->method('orderItem');

        $this->itemRepository->expects($this->exactly(2))
            ->method('delete');

        $this->logger->expects($this->never())->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenOrderServiceFailsForOneItemThenErrorLoggedAndOtherItemProcessed(): void
    {
        // Given
        $expiredItem1 = $this->createExpiredItem1();
        $expiredItem2 = $this->createExpiredItem2();
        $expiredItems = [$expiredItem1, $expiredItem2];

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn($expiredItems);
        $callCount = 0;
        $this->orderService->expects($this->exactly(2))
            ->method('orderItem')
            ->willReturnCallback(function () use (&$callCount) {
                $callCount++;
                if ($callCount === 1) {
                    throw new \RuntimeException('Order service failed');
                }
                return null;
            });

        $this->itemRepository->expects($this->once())
            ->method('delete')
            ->with(self::ITEM_ID_2);

        $this->logger->expects($this->once())
            ->method('error')
            ->with('Failed to place order for expired item ' . self::ITEM_ID_1 . ': Order service failed');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenRepositoryFindThrowsDomainExceptionThenApplicationExceptionThrown(): void
    {
        // Given
        $domainException = new DomainException('Repository error');

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willThrowException($domainException);

        $this->orderService->expects($this->never())->method('orderItem');
        $this->itemRepository->expects($this->never())->method('delete');

        // When & Then
        $this->expectException(ApplicationException::class);
        $this->expectExceptionMessage('Failed to handle expired items: Repository error');

        $this->handleExpiredItems->execute();
    }

    public function testWhenRepositoryDeleteThrowsExceptionThenErrorLogged(): void
    {
        // Given
        $expiredItem = $this->createExpiredItem1();
        $expiredItems = [$expiredItem];

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn($expiredItems);

        $this->orderService->expects($this->once())
            ->method('orderItem')
            ->with($expiredItem);

        $this->itemRepository->expects($this->once())
            ->method('delete')
            ->with(self::ITEM_ID_1)
            ->willThrowException(new \RuntimeException('Delete failed'));

        $this->logger->expects($this->once())
            ->method('error')
            ->with($this->stringContains('Failed to place order for expired item'));

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenTimeProviderThrowsDomainExceptionThenApplicationExceptionThrown(): void
    {
        // Given
        $domainException = new DomainException('Time provider error');

        $this->timeProvider->method('now')
            ->willThrowException($domainException);

        $this->expirationSpec->expects($this->never())->method('getSpec');
        $this->itemRepository->expects($this->never())->method('findWhere');
        $this->orderService->expects($this->never())->method('orderItem');
        $this->itemRepository->expects($this->never())->method('delete');

        // When & Then
        $this->expectException(ApplicationException::class);
        $this->expectExceptionMessage('Failed to handle expired items: Time provider error');

        $this->handleExpiredItems->execute();
    }

    public function testWhenNoItemsFoundThenNoProcessingOccurs(): void
    {
        // Given
        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn([]);

        $this->orderService->expects($this->never())->method('orderItem');
        $this->itemRepository->expects($this->never())->method('delete');
        $this->logger->expects($this->never())->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenExpiredItemsFoundThenTheyAreProcessed(): void
    {
        // Given
        $expiredItem1 = $this->createExpiredItem1();
        $expiredItem2 = $this->createExpiredItem2();
        $expiredItems = [$expiredItem1, $expiredItem2];

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn($expiredItems);

        $this->orderService->expects($this->exactly(2))
            ->method('orderItem');

        $this->itemRepository->expects($this->exactly(2))
            ->method('delete');

        $this->logger->expects($this->never())->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenAllOrderServicesFailThenAllErrorsLogged(): void
    {
        // Given
        $expiredItem1 = $this->createExpiredItem1();
        $expiredItem2 = $this->createExpiredItem2();
        $expiredItems = [$expiredItem1, $expiredItem2];

        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn($expiredItems);

        $this->orderService->expects($this->exactly(2))
            ->method('orderItem')
            ->willThrowException(new \RuntimeException('Order service failed'));

        $this->itemRepository->expects($this->never())->method('delete');

        $this->logger->expects($this->exactly(2))
            ->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }

    public function testWhenRepositoryFindReturnsEmptyArrayThenNoProcessingOccurs(): void
    {
        // Given
        $spec = new Specification([
            'expirationDate', '<=', '2023-01-01 12:00:00'
        ]);
        $this->expirationSpec->expects($this->once())
            ->method('getSpec')
            ->willReturn($spec);

        $this->itemRepository->expects($this->once())
            ->method('findWhere')
            ->willReturn([]);

        $this->orderService->expects($this->never())->method('orderItem');
        $this->itemRepository->expects($this->never())->method('delete');
        $this->logger->expects($this->never())->method('error');

        // When & Then
        $this->handleExpiredItems->execute();
    }
}