<?php

namespace App\Tests;

use App\Ops\Environment;
use PHPUnit\Framework\TestCase;
use Symfony\Component\Dotenv\Dotenv;

final class EnvironmentTest extends TestCase
{
    private string $root;

    protected function setUp(): void
    {
        $this->root = sys_get_temp_dir().'/kant-environment-'.bin2hex(random_bytes(6));
        mkdir($this->root);
        file_put_contents($this->root.'/.env.example', "APP_ENV=prod\nDATABASE_URL=sqlite:///default.db\nMAILER_DSN=null://null\n");
    }

    protected function tearDown(): void
    {
        $files = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator($this->root, \FilesystemIterator::SKIP_DOTS), \RecursiveIteratorIterator::CHILD_FIRST);
        foreach ($files as $file) {
            $file->isDir() ? rmdir($file->getPathname()) : unlink($file->getPathname());
        }
        rmdir($this->root);
    }

    public function testNewInstallationUsesOnlyEnvAndKeepsSecretAcrossRequests(): void
    {
        Environment::prepare($this->root);
        $secret = Environment::ensureSecret($this->root);
        Environment::write($this->root, ['DATABASE_URL' => 'sqlite:///customer.db']);
        Environment::prepare($this->root);
        self::assertSame($secret, Environment::ensureSecret($this->root));
        self::assertSame('sqlite:///customer.db', $this->values()['DATABASE_URL']);
        self::assertFileDoesNotExist($this->root.'/.env.local');
    }

    public function testLegacySettingsAreConsolidatedOnceWithBothOriginalsBackedUp(): void
    {
        Environment::prepare($this->root);
        $legacy = "DATABASE_URL=sqlite:///live.db\nAPP_SECRET=existing-secret\nCUSTOM_OPTION=kept\n";
        file_put_contents($this->root.'/.env.local', $legacy);
        Environment::prepare($this->root);
        self::assertSame('sqlite:///live.db', $this->values()['DATABASE_URL']);
        self::assertSame('existing-secret', Environment::ensureSecret($this->root));
        self::assertSame('kept', $this->values()['CUSTOM_OPTION']);
        self::assertFileDoesNotExist($this->root.'/.env.local');
        $backups = glob($this->root.'/var/backups/environment-*/.env.local');
        self::assertCount(1, $backups);
        self::assertSame($legacy, file_get_contents($backups[0]));
        Environment::write($this->root, ['DATABASE_URL' => 'sqlite:///chosen.db']);
        Environment::prepare($this->root);
        self::assertSame('sqlite:///chosen.db', $this->values()['DATABASE_URL'], 'No legacy override after editing .env.');
        self::assertCount(1, glob($this->root.'/var/backups/environment-*'));
    }

    public function testSecretsAndCustomSettingsRoundTripWithoutInterpolation(): void
    {
        Environment::prepare($this->root);
        $value = 'a$NOT_AN_ENV_VALUE"b\\c';
        Environment::write($this->root, ['APP_SECRET' => $value, 'CUSTOM_OPTION' => "one\ntwo"]);
        Environment::write($this->root, ['SITE_ORIGIN' => 'https://example.org']);
        self::assertSame($value, $this->values()['APP_SECRET']);
        self::assertSame("one\ntwo", $this->values()['CUSTOM_OPTION']);
        self::assertSame('null://null', $this->values()['MAILER_DSN']);
    }

    public function testFailedMigrationPreservesBothOriginalFiles(): void
    {
        Environment::prepare($this->root);
        $before = file_get_contents($this->root.'/.env');
        $legacy = "APP_SECRET=preserved\nDATABASE_URL=sqlite:///live.db\n";
        file_put_contents($this->root.'/.env.local', $legacy);
        unlink($this->root.'/.env.lock');
        mkdir($this->root.'/.env.lock'); // An unwritable lock target, reproducible on Windows/Linux.
        try {
            Environment::prepare($this->root);
            self::fail('Migration must report failure.');
        } catch (\RuntimeException $error) {
            self::assertStringContainsString('Schreibrechte', $error->getMessage());
        }
        self::assertSame($before, file_get_contents($this->root.'/.env'));
        self::assertSame($legacy, file_get_contents($this->root.'/.env.local'));
    }

    public function testBootstrapIgnoresOtherOverlaysButHonorsExplicitServerVariables(): void
    {
        mkdir($this->root.'/config');
        mkdir($this->root.'/vendor');
        copy(dirname(__DIR__).'/config/bootstrap.php', $this->root.'/config/bootstrap.php');
        file_put_contents($this->root.'/vendor/autoload.php', '<?php require '.var_export(dirname(__DIR__).'/vendor/autoload.php', true).';');
        file_put_contents($this->root.'/.env', "APP_ENV=prod\nAPP_DEBUG=0\nAPP_SECRET=fixture-secret\nDATABASE_URL=sqlite:///chosen.db\n");
        file_put_contents($this->root.'/.env.prod', "DATABASE_URL=sqlite:///wrong.db\n");
        file_put_contents($this->root.'/.env.prod.local', "DATABASE_URL=sqlite:///also-wrong.db\n");
        file_put_contents($this->root.'/.env.local.php', '<?php return ["DATABASE_URL" => "sqlite:///cached-wrong.db"];');
        file_put_contents($this->root.'/boot.php', '<?php require __DIR__."/config/bootstrap.php"; echo $_SERVER["DATABASE_URL"];');
        foreach ([null, 'sqlite:///server.db'] as $override) {
            $environment = getenv();
            unset($environment['DATABASE_URL']);
            $environment['APP_ENV'] = 'prod';
            if (null !== $override) {
                $environment['DATABASE_URL'] = $override;
            }
            $process = proc_open([PHP_BINARY, $this->root.'/boot.php'], [1 => ['pipe', 'w'], 2 => ['pipe', 'w']], $pipes, $this->root, $environment);
            self::assertIsResource($process);
            $output = stream_get_contents($pipes[1]);
            $error = stream_get_contents($pipes[2]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            self::assertSame(0, proc_close($process), $error);
            self::assertSame($override ?? 'sqlite:///chosen.db', $output);
            self::assertFileDoesNotExist($this->root.'/.env.local');
        }
    }

    private function values(): array
    {
        return (new Dotenv())->parse((string) file_get_contents($this->root.'/.env'));
    }
}