<?php namespace Notes\Route;

use Kash\HandleCacheTrait;
use Notes\ObjectReflection,
    Notes\ObjectResolver;

use Psr\SimpleCache\CacheInterface;
use RuntimeException, DirectoryIterator, Generator, Closure;

class RouteFetcher {
    use HandleCacheTrait;

    public array $list = [];

    protected bool $debug;

    protected array $folderList;

    protected Closure $callback;

    public array $defaultMethods = [ 'GET', 'POST' ];

    protected array $attributes;

    public function __construct(?Closure $callback = null, ? array $folderList = null, ? array $attributes = null, ? CacheInterface $cache = null)
    {
        $this->cache = $cache;

        if ($callback !== null) {
            $this->callback = $callback;
        }

        if ($folderList !== null) {
            $this->folderList = $folderList;
        }

        if ($attributes !== null) {
            $this->attributes = $attributes;
        }
        else {
            $this->attributes = [
                'object' => [ Attribute\Object\Route::class ],
                'method' => [ Attribute\Method\Route::class ],
            ];
        }
    }

    public function addFolder($folder) : void
    {
        $this->folderList[] = $folder;
    }

    public function setFolderList(array $list) : void
    {
        $this->folderList = $list;
    }

    public function scan(? array $folders = null) : Generator
    {
        foreach($folders ?: $this->folderList as $namespace => $folder) {
            if ( ! file_exists($folder) ) {
                throw new RuntimeException(sprintf("Folder `%s` can not be found or scanned", $folder));
            }

            foreach (new DirectoryIterator($folder) as $fileinfo) {
                if ( ! $fileinfo->isDot() ) {
                    if ( $fileinfo->isDir() ) {
                        foreach($this->scan([ "{$namespace}\\" . $fileinfo->getBasename() => $fileinfo->getPathname() ]) as $ns2 => $fi2) {
                            yield $ns2 => $fi2;
                        }
                    }
                    else {
                        yield $namespace => $fileinfo;
                    }
                }
            }
        }
    }

    public function compile(null|array $attributes = null) : array
    {
        $attributes ??= $this->attributes;

        return $this->handleCaching(substr(md5(serialize($attributes)), 0, 7), function() use ($attributes) : array {
            $list = [];

            foreach($this->scan() as $namespace => $file) {
                if (  $file->getExtension() !== "php" ) {
                    continue;
                }

                $base = null;
                $class = $this->generateClassname($file->getBasename(".php"), $namespace);
                $methods = null;

                $objectResolver = new ObjectResolver($class, $this->cache);

                if ( isset($attributes['object']) ) {

                    $objects = $objectResolver->reflectedClass->getClassAttributeListFromClassname($attributes['object'], true, false);

                    foreach($objects as $object) {
                        if ($object->method ?? false ) {
                            $methods ??= (array) $object->method;
                        }

                        $base ??= $object->base ?? null;
                    }
                }

                if ( isset($attributes['method']) ) {
                    $routeList = $objectResolver->reflectedClass->getMethodAttributeListFromClassname( $attributes['method'], false, false );

                    foreach($routeList as $func => $routes) {
                        if (is_array($routes)) {

                            foreach ($routes as $route) {
                                if ($route instanceof \Notes\Route\Attribute\Method\Route) {
                                    $route->base = $route->base ?: $base;
                                }
                                $route->class = $class;
                                $route->classMethod = $func;

                                if (false === ($route->methods ?? false)) {
                                    $route->methods = $methods ?? $this->defaultMethods;
                                }

                                if (false !== ($this->callback ?? false)) {
                                    call_user_func_array($this->callback, [$route]);
                                }

                                $list[] = $route;
                            }
                        }
                    }
                }
            }

            return $list;
        });
    }

    protected function generateClassname($file, $namespace)
    {
        return "\\$namespace\\$file";
    }
}