<?php

use PHPUnit\Framework\TestCase;

/**
 * RateLimitExtendedTest — Integration tests for RateLimit using a temp directory.
 */
class RateLimitExtendedTest extends TestCase
{
    private string $tmpDir;

    protected function setUp(): void
    {
        $this->tmpDir = sys_get_temp_dir() . '/xamxam_ratelimit_test_' . uniqid();
        mkdir($this->tmpDir, 0755, true);
    }

    protected function tearDown(): void
    {
        $files = glob($this->tmpDir . '/*.json');
        foreach ($files as $file) {
            unlink($file);
        }
        rmdir($this->tmpDir);
    }

    private function newRateLimit(int $max = 5, int $window = 60): RateLimit
    {
        return new RateLimit($max, $window, $this->tmpDir);
    }

    // ── checkKey: per-key limits, not global ──────────────────────────────────

    public function testCheckKeyCountsPerKey(): void
    {
        $rl = $this->newRateLimit(2, 60);

        $this->assertTrue($rl->checkKey('key-a'));
        $this->assertTrue($rl->checkKey('key-b'));
        $this->assertTrue($rl->checkKey('key-a'));  // second hit for key-a, still allowed

        // key-a is now at limit (2)
        $this->assertFalse($rl->checkKey('key-a'));

        // key-b still has room
        $this->assertTrue($rl->checkKey('key-b'));
        $this->assertFalse($rl->checkKey('key-b'));
    }

    public function testCheckKeyDoesNotAffectDefaultCheck(): void
    {
        $rl = $this->newRateLimit(3, 60);

        $rl->checkKey('separate-key');
        $rl->checkKey('separate-key');
        $rl->checkKey('separate-key');
        $rl->checkKey('separate-key'); // exhausted for this key

        // Default check (uses REMOTE_ADDR) should be unaffected by key-based tracking
        $ipKey = md5($_SERVER['REMOTE_ADDR'] ?? 'unknown');
        $ipFile = $this->tmpDir . '/' . $ipKey . '.json';
        $this->assertFileDoesNotExist($ipFile);
    }

    // ── getRemaining: tied to client IP (REMOTE_ADDR) ─────────────────────────

    public function testGetRemainingStartsAtMax(): void
    {
        $rl = $this->newRateLimit(5, 60);

        $remaining = $rl->getRemaining();
        $this->assertSame(5, $remaining);
    }

    public function testCheckDecrementsRemainingForSameIp(): void
    {
        $rl = $this->newRateLimit(5, 60);

        // check() uses IP-based identifier. We need to use check() directly,
        // not checkKey(), for getRemaining() to reflect usage.
        $rl->check(); // hit 1
        $this->assertSame(4, $rl->getRemaining());

        $rl->check(); // hit 2
        $this->assertSame(3, $rl->getRemaining());
    }

    public function testCheckAndCheckKeyAreIndependent(): void
    {
        $rl = $this->newRateLimit(5, 60);

        // checkKey hits don't affect IP-based remaining
        $rl->checkKey('some-key');
        $rl->checkKey('some-key');

        $this->assertSame(5, $rl->getRemaining());
    }

    // ── Consistent client identifier ─────────────────────────────────────────

    public function testMultipleChecksFromSameClient(): void
    {
        $rl = $this->newRateLimit(1, 60);

        // First check passes, second from same IP fails
        $this->assertTrue($rl->check());
        $this->assertFalse($rl->check());
    }

    public function testGetRemainingReturnsZeroAfterExhaustion(): void
    {
        $rl = $this->newRateLimit(1, 60);

        $rl->check();
        $this->assertSame(0, $rl->getRemaining());
    }

    // ── reset time ────────────────────────────────────────────────────────────

    public function testGetResetTimeReturnsZeroWhenNoData(): void
    {
        $rl = $this->newRateLimit(5, 60);
        $this->assertSame(0, $rl->getResetTime());
    }

    public function testGetResetTimePositiveAfterHits(): void
    {
        $rl = $this->newRateLimit(5, 60);
        $rl->check(); // use IP-based check so file is written

        $reset = $rl->getResetTime();
        $this->assertGreaterThan(0, $reset);
        $this->assertLessThanOrEqual(60, $reset);
    }

    // ── cleanup ───────────────────────────────────────────────────────────────

    public function testCleanupRemovesOldFiles(): void
    {
        $rl = $this->newRateLimit(5, 60);
        $rl->checkKey('cleanup-test');

        // Touch the cache file to make it old
        $files = glob($this->tmpDir . '/*.json');
        $this->assertNotEmpty($files);
        foreach ($files as $file) {
            touch($file, time() - 90000); // 25 hours ago
        }

        $rl->cleanup();

        // The old file should now be gone
        $filesAfter = glob($this->tmpDir . '/*.json');
        $this->assertEmpty($filesAfter);
    }
}