<?php

declare(strict_types=1);

namespace Weerscherm\Tests;

use PHPUnit\Framework\TestCase;
use Weerscherm\HourlyForecastMapper;

final class HourlyForecastMapperTest extends TestCase
{
    private \DateTimeZone $tz;

    protected function setUp(): void
    {
        $this->tz = new \DateTimeZone('Europe/Berlin');
    }

    /** @return array<string, mixed> */
    private function hourly(): array
    {
        return json_decode((string) file_get_contents(__DIR__ . '/fixtures/forecast.json'), true)['hourly'];
    }

    public function testGroupsByDateAndSamplesEveryOtherHour(): void
    {
        $byDate = HourlyForecastMapper::mapByDate($this->hourly(), $this->tz);

        self::assertSame(['2026-09-11', '2026-09-12', '2026-09-13', '2026-09-14', '2026-09-15', '2026-09-16'], array_keys($byDate));
        self::assertCount(12, $byDate['2026-09-11']);

        $hours = array_map(
            fn(array $p) => (int) (new \DateTimeImmutable($p['at']))->format('H'),
            $byDate['2026-09-11'],
        );
        self::assertSame([0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22], $hours);
    }

    public function testPointShapeAndValues(): void
    {
        $byDate = HourlyForecastMapper::mapByDate($this->hourly(), $this->tz);
        $noon = $byDate['2026-09-11'][6]; // index 6 = 12:00 (0,2,4,6,8,10,12,...)

        self::assertSame(['at', 'temp', 'precip_mm', 'wind_kmh', 'wind_dir'], array_keys($noon));
        self::assertSame('2026-09-11T12:00:00+02:00', $noon['at']);
        self::assertIsFloat($noon['temp']);
        self::assertIsFloat($noon['precip_mm']);
        self::assertIsFloat($noon['wind_kmh']);
        self::assertIsInt($noon['wind_dir']);
    }

    public function testRainOnlyOnTheHoursThatHaveIt(): void
    {
        $byDate = HourlyForecastMapper::mapByDate($this->hourly(), $this->tz);
        // 2026-09-14 heeft 8,2 mm in de dagfixture, verdeeld over 14-16u; de bemonsterde uren zijn 0,2,4,..22.
        $rainy = array_filter($byDate['2026-09-14'], fn(array $p) => $p['precip_mm'] > 0);

        self::assertNotEmpty($rainy);
        foreach ($rainy as $p) {
            self::assertGreaterThanOrEqual(14, (int) (new \DateTimeImmutable($p['at']))->format('H'));
        }
    }

    public function testDaylightSavingDayWithTwentyFiveHoursSamplesWithoutError(): void
    {
        $hourly = json_decode((string) file_get_contents(__DIR__ . '/fixtures/hourly-dst.json'), true);

        $byDate = HourlyForecastMapper::mapByDate($hourly, $this->tz);

        self::assertCount(13, $byDate['2026-10-25'], '25 punten, om de 2: index 0,2,...,24 = 13 stuks');
    }

    public function testNullValuesStayNull(): void
    {
        $hourly = $this->hourly();
        $hourly['temperature_2m'][0] = null;
        $hourly['wind_direction_10m'][0] = 'kapot';

        $byDate = HourlyForecastMapper::mapByDate($hourly, $this->tz);

        self::assertNull($byDate['2026-09-11'][0]['temp']);
        self::assertNull($byDate['2026-09-11'][0]['wind_dir']);
    }

    public function testMalformedTimestampsAreSkipped(): void
    {
        $byDate = HourlyForecastMapper::mapByDate([
            'time' => ['niet-een-datum', '2026-09-11T05:00'],
            'temperature_2m' => [1.0, 2.0],
            'precipitation' => [0.0, 0.0],
            'wind_speed_10m' => [1.0, 1.0],
            'wind_direction_10m' => [1, 1],
        ], $this->tz);

        self::assertSame(['2026-09-11'], array_keys($byDate));
        self::assertCount(1, $byDate['2026-09-11']);
    }

    public function testMissingTimeArrayGivesEmptyResult(): void
    {
        self::assertSame([], HourlyForecastMapper::mapByDate([], $this->tz));
    }
}