<?php

declare(strict_types=1);

namespace Scape\Tests;

use PHPUnit\Framework\TestCase;
use Scape\Engine;

class CacheTest extends TestCase
{
    private string $templatesDir;
    private string $cacheDir;

    protected function setUp(): void
    {
        $this->templatesDir = __DIR__ . '/fixtures';
        $this->cacheDir = __DIR__ . '/../.scape/cache_test';
        
        if (!is_dir($this->cacheDir)) {
            mkdir($this->cacheDir, 0777, true);
        }
    }

    protected function tearDown(): void
    {
        $this->rmdirRecursive($this->cacheDir);
    }

    private function rmdirRecursive(string $dir): void
    {
        if (!is_dir($dir)) return;
        $files = array_diff(scandir($dir), ['.', '..']);
        foreach ($files as $file) {
            $path = $dir . '/' . $file;
            is_dir($path) ? $this->rmdirRecursive($path) : unlink($path);
        }
        rmdir($dir);
    }

    public function testCreatesCacheFile(): void
    {
        $engine = new Engine([
            'templates_dir' => $this->templatesDir,
            'cache_dir' => $this->cacheDir,
            'mode' => 'production'
        ]);

        $templatePath = $this->templatesDir . '/tests/simple.scape.php';
        $cacheKey = md5($templatePath);
        $cacheFile = $this->cacheDir . '/' . $cacheKey . '.ast';

        $this->assertFileDoesNotExist($cacheFile);
        $engine->render('tests.simple', ['name' => 'Funky', 'items' => []]);
        $this->assertFileExists($cacheFile);
    }

    public function testUsesCacheInProduction(): void
    {
        $engine = new Engine([
            'templates_dir' => $this->templatesDir,
            'cache_dir' => $this->cacheDir,
            'mode' => 'production'
        ]);

        $engine->render('tests.simple', ['name' => 'First', 'items' => []]);
        
        // Modify template file but production should still use old cache
        $templatePath = $this->templatesDir . '/tests/simple.scape.php';
        $originalContent = file_get_contents($templatePath);
        file_put_contents($templatePath, 'Modified Content');
        
        $output = $engine->render('tests.simple', ['name' => 'Second', 'items' => []]);
        $this->assertStringContainsString('Hello Second!', $output); // simple.scape.php has "Hello {{ name }}!"
        
        // Restore
        file_put_contents($templatePath, $originalContent);
    }

    public function testInvalidatesCacheInDebug(): void
    {
        $engine = new Engine([
            'templates_dir' => $this->templatesDir,
            'cache_dir' => $this->cacheDir,
            'mode' => 'debug'
        ]);

        $templatePath = $this->templatesDir . '/tests/cache_debug.scape.php';
        file_put_contents($templatePath, 'Original');
        
        $engine->render('tests.cache_debug');
        
        // Sleep to ensure mtime difference
        sleep(1);
        file_put_contents($templatePath, 'Modified');
        
        $output = $engine->render('tests.cache_debug');
        $this->assertEquals('Modified', $output);
        
        unlink($templatePath);
    }
}