<?php

namespace Lean;

use Composer\EventDispatcher\Event;
use Kash\CacheInvalidator;

class Composer
{
    public static function postInstall(Event $event) : void
    {
        $event->getIO()->write("post-install script executing ...");

        if ( $event->getIO()->askConfirmation("Do you want to install Lean's Project Skeleton ? ( 'yes' or 'no' (default) ): ", false) ) {
            $ns = trim(static::getNamespaceFromAutoload($event), '\\');

            $replace = [
                '%NAMESPACE%' => $ns,
                '%ESCAPED_NAMESPACE%' => addslashes($ns),
                '%APPKEY%' => strtolower(str_replace('\\', '.', $ns)),
                '%RAND64%' => substr(base64_encode(random_bytes(100)), 0, 64),
            ];

            $dir = static::createPath();

            if ( is_writable($dir) ) {
                $source = static::createPath('vendor', 'mcnd', 'lean', 'skeleton');
                $dest = static::createPath('skeleton');

                `cp -a $source $dest`;

                $iterator = new \RecursiveDirectoryIterator($dest);
                $iterator->setFlags(\RecursiveDirectoryIterator::SKIP_DOTS);

                foreach (new \RecursiveIteratorIterator($iterator) as $file) {
                    if ( in_array($file->getExtension(), [ 'php', 'phtml', 'env' ]) ) {
                        $content = str_replace(array_keys($replace), array_values($replace), file_get_contents($file->getPathname()));

                        file_put_contents($file->getPathname(), $content);
                    }
                }

                foreach(scandir(static::createPath('skeleton')) as $item) {
                    if ( in_array($item, [ '.', '..' ]) ) continue;

                    rename(static::createPath('skeleton', $item), static::createPath($item));
                }

                rmdir($dest);

                $event->getIO()->write("Installation completed.");

                static::postUpdate($event);
            }
            else {
                $event->getIO()->writeError(sprintf("The user you are running this script with doesn't seem to have a writable permission on directory %s", static::createPath()));
            }
        }
    }

    public static function postUpdate(Event $event) : void
    {
        $event->getIO()->write("post-update script executing ...");

        $path = static::createPath('var/cache/version.cache');

        if ( is_writeable(dirname($path)) ) {
            $event->getIO()->write("regenerating cache file version to invalidate cache for path '$path'");

            new CacheInvalidator($path, true);
        }

        if ( file_exists($container = static::createPath('var/cache/di/CompiledContainer.php')) ) {
            unlink($container);
        }

        if (function_exists("apcu_clear_cache")) {
            apcu_clear_cache();
        }
    }

    public static function readComposerLock() : false|array
    {
        static $content = null;

        $path = static::createPath('composer.lock');

        if (! file_exists($path) ) {
            throw new \UnexpectedValueException("Composer file 'composer.lock' could not be found within your project's root folder.");
        }

        return $content ??= file_exists($path) ? json_decode(file_get_contents($path), true) : false;
    }

    public static function readComposerJson() : false|array
    {
        static $content = null;

        $path = static::createPath('composer.json');

        if (! file_exists($path) ) {
            throw new \UnexpectedValueException("Composer file 'composer.json' could not be found within your project's root folder.");
        }

        return $content ??= file_exists($path) ? json_decode(file_get_contents($path), true) : false;
    }

    protected static function getNamespaceFromAutoload(Event $event) : ? string
    {
        if ( false !== $composerJson = static::readComposerJson() ) {
            if ( $psr4 = $composerJson['autoload']['psr-4'] ?? false ) {
                foreach($psr4 as $ns => $directory) {
                    if ($directory === 'src/') {
                        return $ns;
                    }
                }
            }
            else {
                $event->getIO()->writeError("Your composer file do not seem to contains a valid psr-4 project of it's autoload array.");
            }
        }
        else {
            $event->getIO()->writeError("Composer.json file not found. Have this script been launch from the Composer CLI at the root of your project ?");
        }

        $event->getIO()->writeError("Your composer file do not seem to contains a valid psr-4 project pointing to the src folder.");

        return null;
    }

    protected static function createPath(... $path) : string
    {
        return implode(DIRECTORY_SEPARATOR, array_merge([ $_SERVER['PWD'] ?? getenv('PROJECT_PATH') ], $path));
    }
}