<?php

declare(strict_types=1);

namespace App\Tests\Controller\Api;

use App\Controller\Api\ExportController;
use App\Model\TravelExport;
use App\Model\TravelExportQuery;
use App\Service\TravelExportBuilder;
use PHPUnit\Framework\TestCase;
use Symfony\Component\DependencyInjection\Container;
use Symfony\Component\HttpFoundation\Response;

class ExportControllerTest extends TestCase
{
    public function testPaginatesAndReportsWholeExportFigures(): void
    {
        $meta = $this->call(new TravelExportQuery(1, 5))['meta'];

        self::assertSame(1, $meta['page']);
        self::assertSame(5, $meta['perPage']);
        self::assertSame(12, $meta['total'], 'total is the whole export, not this page');
        self::assertSame(3, $meta['totalPages']);
    }

    public function testCountersAreIdenticalOnEveryPage(): void
    {
        // Whole-export figures repeated per page, so a consumer can abort after page 1.
        $first = $this->call(new TravelExportQuery(1, 5))['meta'];
        $last = $this->call(new TravelExportQuery(3, 5))['meta'];

        foreach (['total', 'totalPages', 'skipped', 'pickupsWithoutMasterData', 'sourceGeneratedAt', 'generatedAt'] as $key) {
            self::assertSame($first[$key], $last[$key], $key.' must not vary by page');
        }
    }

    public function testConsecutivePagesDoNotOverlap(): void
    {
        $first = array_column($this->call(new TravelExportQuery(1, 5))['data'], 'busProId');
        $second = array_column($this->call(new TravelExportQuery(2, 5))['data'], 'busProId');

        self::assertSame([1, 2, 3, 4, 5], $first);
        self::assertSame([6, 7, 8, 9, 10], $second);
        self::assertSame([], array_intersect($first, $second));
    }

    public function testTheLastPageIsShort(): void
    {
        $data = $this->call(new TravelExportQuery(3, 5))['data'];

        self::assertCount(2, $data);
        self::assertSame([11, 12], array_column($data, 'busProId'));
    }

    public function testAPageBeyondTheEndIsEmptyRatherThanAnError(): void
    {
        $body = $this->call(new TravelExportQuery(99, 5));

        self::assertSame([], $body['data']);
        self::assertSame(12, $body['meta']['total']);
    }

    public function testDefaultsToTheFirstPageOfFiveHundred(): void
    {
        $body = $this->call();

        self::assertSame(1, $body['meta']['page']);
        self::assertSame(500, $body['meta']['perPage']);
        self::assertSame(1, $body['meta']['totalPages']);
        self::assertCount(12, $body['data']);
    }

    public function testCarriesTheBuilderCounters(): void
    {
        $meta = $this->call(null, 7, 21)['meta'];

        self::assertSame(7, $meta['skipped']);
        self::assertSame(21, $meta['pickupsWithoutMasterData']);
        self::assertSame('2026-09-29T03:20:00+02:00', $meta['generatedAt']);
        self::assertSame('2026-09-28T23:10:15+02:00', $meta['sourceGeneratedAt']);
    }

    public function testAnUnknownSourceExportIsNullRatherThanOmitted(): void
    {
        $builder = $this->createStub(TravelExportBuilder::class);
        $builder->method('build')->willReturn(new TravelExport([], 0, 0, new \DateTimeImmutable()));

        $meta = json_decode((string) $this->controller($builder)->travels(new TravelExportQuery())->getContent(), true)['meta'];

        self::assertArrayHasKey('sourceGeneratedAt', $meta);
        self::assertNull($meta['sourceGeneratedAt']);
    }

    /**
     * A builder failure must reach the consumer as a 5xx, never as the 200-with-an-error-body
     * shape TravelController::hotelAvailability() uses: the retry logic keys on the status code.
     */
    public function testABuilderFailureIsNotDowngradedToATwoHundred(): void
    {
        $builder = $this->createStub(TravelExportBuilder::class);
        $builder->method('build')->willThrowException(new \RuntimeException('cache exploded'));

        $this->expectException(\RuntimeException::class);

        $this->controller($builder)->travels(new TravelExportQuery());
    }

    /**
     * @return array<string, mixed>
     */
    private function call(?TravelExportQuery $query = null, int $skipped = 0, int $withoutMasterData = 0): array
    {
        $rows = [];
        for ($i = 1; $i <= 12; ++$i) {
            $rows[] = ['busProId' => $i, 'hotel' => ['busProId' => 1], 'pickups' => []];
        }

        $builder = $this->createStub(TravelExportBuilder::class);
        $builder->method('build')->willReturn(new TravelExport(
            $rows,
            $skipped,
            $withoutMasterData,
            new \DateTimeImmutable('2026-09-29 03:20:00', new \DateTimeZone('Europe/Berlin')),
            new \DateTimeImmutable('2026-09-28 23:10:15', new \DateTimeZone('Europe/Berlin')),
        ));

        $response = $this->controller($builder)->travels($query ?? new TravelExportQuery());

        self::assertSame(Response::HTTP_OK, $response->getStatusCode());

        return json_decode((string) $response->getContent(), true);
    }

    private function controller(TravelExportBuilder $builder): ExportController
    {
        $controller = new ExportController($builder);

        // No 'serializer' service registered, so AbstractController::json() falls back to
        // JsonResponse -- which is what this endpoint produces in production anyway.
        $controller->setContainer(new Container());

        return $controller;
    }
}