<?php

declare(strict_types=1);

namespace App\Tests\Booking;

use App\Booking\AlreadyHoldingResourceException;
use App\Booking\BookingManager;
use App\Booking\RecurrenceRule;
use App\Booking\ResourceAlreadyBookedException;
use App\Booking\TimeRange;
use App\Entity\Booking;
use App\Entity\BookingSeries;
use App\Entity\Resource;
use App\Entity\ResourceType;
use App\Entity\User;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;

/**
 * The double-booking guard now lives here rather than in a unique index, so this is where it is
 * tested. BookingManager opens its own transactions (it locks the resource row FOR UPDATE), so
 * these tests cannot wrap themselves in one -- a rollback would fight the manager's commits.
 * They clean up explicitly instead.
 */
class BookingManagerTest extends KernelTestCase
{
    private EntityManagerInterface $em;
    private BookingManager $manager;

    protected function setUp(): void
    {
        self::bootKernel();
        $this->em = self::getContainer()->get(EntityManagerInterface::class);
        $this->manager = self::getContainer()->get(BookingManager::class);
        $this->wipe();
    }

    protected function tearDown(): void
    {
        $this->wipe();
        parent::tearDown();
    }

    public function testAFreeResourceIsBooked(): void
    {
        $booking = $this->manager->book($this->user('a@ep-reisen.de'), $this->resource('D1'), $this->date(), TimeRange::fromMinutes(540, 780));

        self::assertNotNull($booking->getId());
        self::assertSame('09:00–13:00', (string) $booking->getTimeRange());
    }

    public function testAnOverlappingSpanOnTheSameResourceIsRefused(): void
    {
        $desk = $this->resource('D1');
        $this->manager->book($this->user('a@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(540, 780));

        $this->expectException(ResourceAlreadyBookedException::class);
        $this->manager->book($this->user('b@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(660, 900));
    }

    public function testATouchingSpanOnTheSameResourceIsAllowed(): void
    {
        $desk = $this->resource('D1');
        $this->manager->book($this->user('a@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(540, 780));

        $second = $this->manager->book($this->user('b@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(780, 1020));

        self::assertNotNull($second->getId());
    }

    public function testOnePersonMayNotHoldTwoDesksAtOnce(): void
    {
        $user = $this->user('a@ep-reisen.de');
        $this->manager->book($user, $this->resource('D1'), $this->date(), TimeRange::fromMinutes(540, 780));

        $this->expectException(AlreadyHoldingResourceException::class);
        $this->manager->book($user, $this->resource('D2'), $this->date(), TimeRange::fromMinutes(600, 720));
    }

    public function testOnePersonMayHoldTwoDesksAtDifferentTimes(): void
    {
        $user = $this->user('a@ep-reisen.de');
        $this->manager->book($user, $this->resource('D1'), $this->date(), TimeRange::fromMinutes(540, 780));

        $afternoon = $this->manager->book($user, $this->resource('D2'), $this->date(), TimeRange::fromMinutes(780, 1020));

        self::assertNotNull($afternoon->getId());
    }

    public function testADeskAndAParkingSpotAtTheSameTimeAreBothAllowed(): void
    {
        $user = $this->user('a@ep-reisen.de');
        $time = TimeRange::fromMinutes(540, 780);
        $this->manager->book($user, $this->resource('D1'), $this->date(), $time);

        $parking = $this->manager->book($user, $this->resource('P1', ResourceType::PARKING), $this->date(), $time);

        self::assertNotNull($parking->getId());
    }

    public function testASeriesMaterialisesOneBookingPerOccurrence(): void
    {
        // 2026-10-05 is a Monday.
        $series = new BookingSeries(
            $this->user('a@ep-reisen.de'),
            $this->resource('D1'),
            RecurrenceRule::WEEKLY,
            new \DateTimeImmutable('2026-10-05'),
            new \DateTimeImmutable('2026-10-30'),
            TimeRange::fromMinutes(540, 720),
            [1, 4],
        );

        $result = $this->manager->bookSeries($series);

        self::assertSame(8, $result->createdCount());
        self::assertSame(0, $result->skippedCount());
        foreach ($result->created as $booking) {
            self::assertContains((int) $booking->getDate()->format('N'), [1, 4]);
            self::assertSame($series, $booking->getSeries());
        }
    }

    public function testADailySeriesCoversEveryDay(): void
    {
        $result = $this->manager->bookSeries(new BookingSeries(
            $this->user('a@ep-reisen.de'),
            $this->resource('D1'),
            RecurrenceRule::DAILY,
            new \DateTimeImmutable('2026-10-05'),
            new \DateTimeImmutable('2026-10-11'),
            TimeRange::fromMinutes(540, 720),
        ));

        self::assertSame(7, $result->createdCount());
    }

    /**
     * The point of materialising: a taken day is reported rather than failing the whole series.
     */
    public function testASeriesSkipsDaysThatAreAlreadyTaken(): void
    {
        $desk = $this->resource('D1');
        $this->manager->book($this->user('b@ep-reisen.de'), $desk, new \DateTimeImmutable('2026-10-08'), TimeRange::fromMinutes(600, 660));

        $result = $this->manager->bookSeries(new BookingSeries(
            $this->user('a@ep-reisen.de'),
            $desk,
            RecurrenceRule::WEEKLY,
            new \DateTimeImmutable('2026-10-05'),
            new \DateTimeImmutable('2026-10-30'),
            TimeRange::fromMinutes(540, 720),
            [1, 4],
        ));

        self::assertSame(7, $result->createdCount());
        self::assertSame(['8.10.'], $result->skippedDates());
        self::assertFalse($result->isCompletelyBlocked());
    }

    public function testASeriesThatCollidesEverywhereReportsItself(): void
    {
        $desk = $this->resource('D1');
        $this->manager->book($this->user('b@ep-reisen.de'), $desk, new \DateTimeImmutable('2026-10-05'));

        $result = $this->manager->bookSeries(new BookingSeries(
            $this->user('a@ep-reisen.de'),
            $desk,
            RecurrenceRule::WEEKLY,
            new \DateTimeImmutable('2026-10-05'),
            new \DateTimeImmutable('2026-10-09'),
            TimeRange::fromMinutes(540, 720),
            [1],
        ));

        self::assertTrue($result->isCompletelyBlocked());
        self::assertSame(0, $result->createdCount());
    }

    public function testReschedulingAnOccurrenceMarksItAsAnOverride(): void
    {
        $series = $this->weeklySeries();
        $occurrence = $this->manager->bookSeries($series)->created[0];

        $this->manager->reschedule($occurrence, TimeRange::fromMinutes(840, 960));

        self::assertTrue($occurrence->isOverridden());
        self::assertSame('14:00–16:00', (string) $occurrence->getTimeRange());
    }

    public function testReschedulingBackOntoTheSeriesTimesClearsTheOverride(): void
    {
        $series = $this->weeklySeries();
        $occurrence = $this->manager->bookSeries($series)->created[0];

        $this->manager->reschedule($occurrence, TimeRange::fromMinutes(840, 960));
        $this->manager->reschedule($occurrence, $series->getTimeRange());

        self::assertFalse($occurrence->isOverridden());
    }

    public function testReschedulingIntoSomebodyElsesSpanIsRefused(): void
    {
        $desk = $this->resource('D1');
        $mine = $this->manager->book($this->user('a@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(540, 780));
        $this->manager->book($this->user('b@ep-reisen.de'), $desk, $this->date(), TimeRange::fromMinutes(780, 1020));

        $this->expectException(ResourceAlreadyBookedException::class);
        $this->manager->reschedule($mine, TimeRange::fromMinutes(540, 900));
    }

    /**
     * Rescheduling must not trip over the booking it is moving -- that would make every edit
     * that keeps any part of its own span impossible.
     */
    public function testAnOccurrenceCanBeShrunkWithoutCollidingWithItself(): void
    {
        $booking = $this->manager->book($this->user('a@ep-reisen.de'), $this->resource('D1'), $this->date(), TimeRange::fromMinutes(540, 780));

        $this->manager->reschedule($booking, TimeRange::fromMinutes(600, 720));

        self::assertSame('10:00–12:00', (string) $booking->getTimeRange());
    }

    public function testEndingASeriesRemovesItsRemainingOccurrences(): void
    {
        $series = $this->weeklySeries();
        $this->manager->bookSeries($series);

        $id = $series->getId();

        $removed = $this->manager->endSeries($series, new \DateTimeImmutable('2026-10-05'));

        self::assertSame(8, $removed);
        self::assertSame([], $this->em->getRepository(Booking::class)->findBy(['series' => $id]));
        // Nothing of the series is left, so the series row goes too -- note $series has no id
        // any more at this point, which is why the lookup goes through the captured one.
        self::assertNull($this->em->getRepository(BookingSeries::class)->find($id));
    }

    public function testEndingASeriesPartWayThroughKeepsThePastAndShortensIt(): void
    {
        $series = $this->weeklySeries();
        $this->manager->bookSeries($series);

        $removed = $this->manager->endSeries($series, new \DateTimeImmutable('2026-10-15'));

        self::assertSame(5, $removed);
        self::assertCount(3, $this->em->getRepository(Booking::class)->findBy(['series' => $series]));
        self::assertSame('2026-10-14', $series->getEndDate()->format('Y-m-d'));
    }

    private function weeklySeries(): BookingSeries
    {
        return new BookingSeries(
            $this->user('a@ep-reisen.de'),
            $this->resource('D1'),
            RecurrenceRule::WEEKLY,
            new \DateTimeImmutable('2026-10-05'),
            new \DateTimeImmutable('2026-10-30'),
            TimeRange::fromMinutes(540, 720),
            [1, 4],
        );
    }

    private function date(): \DateTimeImmutable
    {
        return new \DateTimeImmutable('2026-10-01');
    }

    private function user(string $email): User
    {
        $user = new User($email, 'Test');
        $user->setRoles(['ROLE_EMPLOYEE']);
        $this->em->persist($user);
        $this->em->flush();

        return $user;
    }

    private function resource(string $label, ResourceType $type = ResourceType::DESK): Resource
    {
        $resource = new Resource($type, $label, strtolower($label));
        $this->em->persist($resource);
        $this->em->flush();

        return $resource;
    }

    private function wipe(): void
    {
        $connection = $this->em->getConnection();
        $connection->executeStatement('DELETE FROM booking');
        $connection->executeStatement('DELETE FROM booking_series');
        $connection->executeStatement('DELETE FROM resource');
        $connection->executeStatement('DELETE FROM `user`');
        $this->em->clear();
    }
}