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<?php

declare(strict_types=1);

namespace Laminas\Di\CodeGenerator;

use Laminas\Di\Exception\GenerateCodeException;
use SplFileObject;
use Throwable;

use function array_keys;
use function array_map;
use function assert;
use function file_get_contents;
use function implode;
use function is_string;
use function sprintf;
use function str_repeat;
use function strtr;
use function var_export;

class AutoloadGenerator
{
    use GeneratorTrait;

    private const CLASS_TEMPLATE = __DIR__ . '/../../templates/autoloader-class.template';
    private const FILE_TEMPLATE  = __DIR__ . '/../../templates/autoloader-file.template';

    public function __construct(private string $namespace)
    {
    }

    private function writeFile(string $filename, string $code): void
    {
        try {
            $file = new SplFileObject($filename, 'w');
            $file->fwrite($code);
        } catch (Throwable $e) {
            throw new GenerateCodeException(sprintf('Failed to write output file "%s"', $filename), 0, $e);
        }
    }

    private function buildFromTemplate(string $templateFile, string $outputFile, array $replacements): void
    {
        $template = file_get_contents($templateFile);

        assert(is_string($template));
        assert(is_string($this->outputDirectory));

        $this->writeFile(
            sprintf('%s/%s', $this->outputDirectory, $outputFile),
            strtr(
                $template,
                $replacements
            )
        );
    }

    /**
     * @param array<string, string> $classmap
     */
    private function generateClassmapCode(array &$classmap): string
    {
        $lines = array_map(
            static fn(string $class, string $file): string => sprintf(
                '%s => %s,',
                var_export($class, true),
                var_export($file, true)
            ),
            array_keys($classmap),
            $classmap
        );

        $indentation = sprintf("\n%s", str_repeat(' ', 8));
        return implode($indentation, $lines);
    }

    /**
     * @param array<string, string> $classmap
     */
    private function generateAutoloaderClass(array &$classmap): void
    {
        $this->buildFromTemplate(self::CLASS_TEMPLATE, 'Autoloader.php', [
            '%namespace%' => $this->namespace ? sprintf("namespace %s;\n", $this->namespace) : '',
            '%classmap%'  => $this->generateClassmapCode($classmap),
        ]);
    }

    private function generateAutoloadFile(): void
    {
        $this->buildFromTemplate(self::FILE_TEMPLATE, 'autoload.php', [
            '%namespace%' => $this->namespace ? sprintf("namespace %s;\n", $this->namespace) : '',
        ]);
    }

    /**
     * @param array<string, string> $classmap
     */
    public function generate(array &$classmap): void
    {
        $this->ensureOutputDirectory();
        $this->generateAutoloaderClass($classmap);
        $this->generateAutoloadFile();
    }
}