<?php

namespace Tests\Unit\Ingest;

use App\Enums\DueMode;
use App\Ingest\DueAtParser;
use InvalidArgumentException;
use Tests\TestCase; // Laravel TestCase: Eloquent date-casts need the connection grammar even in memory

class DueAtParserTest extends TestCase
{
    public function test_date_only_is_whole_day_local(): void
    {
        $p = DueAtParser::parse('2026-08-14');
        $this->assertSame(DueMode::Local, $p->mode);
        $this->assertSame('2026-08-14', $p->date);
        $this->assertSame('24:00:00', $p->time);
        $this->assertNull($p->instant);
        $this->assertSame('2026-08-14', $p->dayFor('Asia/Shanghai'));
    }

    public function test_datetime_without_offset_is_local(): void
    {
        $p = DueAtParser::parse('2026-09-10T14:00');
        $this->assertSame(DueMode::Local, $p->mode);
        $this->assertSame('2026-09-10', $p->date);
        $this->assertSame('14:00:00', $p->time);

        $this->assertSame('14:05:30', DueAtParser::parse('2026-09-10T14:05:30')->time);
    }

    public function test_datetime_with_offset_is_fixed(): void
    {
        $p = DueAtParser::parse('2026-09-10T08:15+02:00');
        $this->assertSame(DueMode::Fixed, $p->mode);
        $this->assertNull($p->date);
        $this->assertSame('2026-09-10T06:15:00+00:00', $p->instant->utc()->toIso8601String());
        $this->assertSame('2026-09-10', $p->dayFor('America/Montevideo'));
        $this->assertSame('2026-09-10', $p->dayFor('Asia/Shanghai'));

        $this->assertSame(DueMode::Fixed, DueAtParser::parse('2026-09-10T06:15:00Z')->mode);
    }

    public function test_garbage_is_rejected(): void
    {
        foreach (['', 'tomorrow', '2026-13-01', '14:00', '2026-09-10 14:00', '2026-09-10T25:00', '2026-02-30T08:15:00+02:00', '2026-09-10T25:00Z'] as $bad) {
            try {
                DueAtParser::parse($bad);
                $this->fail("accepted: $bad");
            } catch (InvalidArgumentException) {
                $this->addToAssertionCount(1);
            }
        }
    }
}