<?php

declare(strict_types=1);

namespace Zhineng\Snowflake\Tests;

use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\TestCase;
use Zhineng\Snowflake\Timestamp;

#[CoversClass(Timestamp::class)]
final class TimestampTest extends TestCase
{
    public function testTimestampCanBeInitialized(): void
    {
        $field = new Timestamp('timestamp', 41);
        $this->assertSame('timestamp', $field->name);
        $this->assertSame(41, $field->bits);
    }

    public function testTimestampHasDefaultParameterValues(): void
    {
        $field = new Timestamp;
        $this->assertSame('timestamp', $field->name);
        $this->assertSame(41, $field->bits);
    }

    public function testTimestampHasMakeFactoryMethod(): void
    {
        $field = Timestamp::make('timestamp', 41);
        $this->assertSame('timestamp', $field->name);
        $this->assertSame(41, $field->bits);
    }

    public function testTimestampHasDynamicValue(): void
    {
        $field = new Timestamp;
        $value1 = $field->value();
        usleep(1000); // Sleep for 1 millisecond
        $value2 = $field->value();
        $this->assertGreaterThan($value1, $value2);
    }

    public function testEpochCanBeCustomized(): void
    {
        $epoch = new \DateTime('2026-01-01 00:00:00');
        $field = new Timestamp('timestamp', 41, $epoch);
        $now = (int) floor(microtime(as_float: true) * 1000);
        $this->assertSame($now - $epoch->getTimestamp() * 1000, $field->value());
    }

    public function testEpochCanBeSetAsInteger(): void
    {
        $epoch = new \DateTime('2026-01-01 00:00:00');
        $timestampInMillis = $epoch->getTimestamp() * 1000;
        $field = new Timestamp('timestamp', 41, $timestampInMillis);
        $now = (int) floor(microtime(as_float: true) * 1000);
        $this->assertSame($now - $timestampInMillis, $field->value());
    }

    public function testEpochMustBeNonNegative(): void
    {
        $this->expectException(\InvalidArgumentException::class);
        $this->expectExceptionMessage('Epoch must be non-negative.');
        new Timestamp('timestamp', 41, -1);
    }
}