<?php

declare(strict_types=1);

namespace Monitor\Api\Tests\Metrics;

use Monitor\Api\Metrics\HookCounter;
use PHPUnit\Framework\TestCase;

final class HookCounterTest extends TestCase
{
    private string $path;

    protected function setUp(): void
    {
        $this->path = sys_get_temp_dir() . '/monitor-hook-counter-' . uniqid() . '/hooks-count';
    }

    protected function tearDown(): void
    {
        if (file_exists($this->path)) {
            unlink($this->path);
        }
        if (is_dir(dirname($this->path))) {
            rmdir(dirname($this->path));
        }
    }

    public function testCountIsZeroWithoutAnyIncrement(): void
    {
        self::assertSame(0, (new HookCounter($this->path))->count());
    }

    public function testIncrementReturnsTheNewCountAndPersistsIt(): void
    {
        $counter = new HookCounter($this->path);

        self::assertSame(1, $counter->increment());
        self::assertSame(2, $counter->increment());
        self::assertSame(3, $counter->increment());
        self::assertSame(3, $counter->count());
    }

    /** Ein zweites Objekt auf demselben Pfad muss den bereits geschriebenen Stand sehen. */
    public function testCountIsSharedAcrossInstancesOnTheSamePath(): void
    {
        (new HookCounter($this->path))->increment();
        (new HookCounter($this->path))->increment();

        self::assertSame(2, (new HookCounter($this->path))->count());
    }

    public function testIncrementCreatesMissingDirectory(): void
    {
        (new HookCounter($this->path))->increment();

        self::assertFileExists($this->path);
    }

    public function testFingerprintReflectsTheCurrentCount(): void
    {
        $counter = new HookCounter($this->path);

        self::assertSame('0', $counter->fingerprint());
        $counter->increment();
        self::assertSame('1', $counter->fingerprint());
    }

    public function testCountResetsOnANewDay(): void
    {
        $day = '2026-10-01';
        $counter = new HookCounter($this->path, static function () use (&$day): string {
            return $day;
        });

        $counter->increment();
        $counter->increment();
        self::assertSame(2, $counter->count());

        $day = '2026-10-02';
        self::assertSame(0, $counter->count());
        self::assertSame(1, $counter->increment());
    }

    public function testLegacyFileContentCountsAsZero(): void
    {
        mkdir(dirname($this->path), 0o775, true);
        file_put_contents($this->path, '12');

        self::assertSame(0, (new HookCounter($this->path))->count());
    }
}