<?php

namespace Goodquestiondev;

use Illuminate\Support\Str;
use Goodquestiondev\Resource;
use Goodquestiondev\Controllers\Controller;
use Symfony\Component\HttpFoundation\Request;

class Route
{
    /**
    * The Application routers
    *
    * @var array
    */
    public $resources = [];

    /**
     * The Application instance.
     *
     * @var self
     */
    private static $instance = null;

    /**
     * The default actions for a resourceful controller.
     *
     * @var array
     */
    public $resourceDefaults = ['index', 'create', 'store', 'show', 'edit', 'update', 'destroy'];

    /**
     * The verbs used in the resource URIs.
     *
     * @var array
     */
    public static $verbs = [
        'create',
        'edit',
    ];

    /**
     * The possible resource keys
     *
     * @var array
     */
    public $resourceKeys = [];

    /**
     * The resource strings
     *
     * @var array
     */
    public $resourceStrings = [];

    /**
     * Create a new simple resource instance following singleton pattern
     *
     * @return self
     */

    public static function getInstance()
    {
        if (self::$instance == null) {
            self::$instance = new self();
        }
    
        return self::$instance;
    }

    /**
     * Register resource
     *
     * @param string $uri The uri string
     *
     * @return void
     */
    public static function resource(string $uri)
    {
        $route = self::getInstance();
        $resourceKeys = array_merge(explode(".", $uri), $route->resourceKeys);
        $route->resourceKeys = array_unique($resourceKeys);
        $route->resourceStrings[] = $uri;
        $route->resources[$uri] = new Resource($uri);
    }

    /**
     * Redirects the user to the correct controller and method based on the path
     *
     * @param Request $request The request data content
     *
     * @return Resource
     */
    public static function getResource($request)
    {
        $route = self::getInstance();
        $uriInfo = $route->getUriInfo($request->getPathInfo());
        foreach ($route->resources as $resource) {
            if (in_array($uriInfo['uri'], $resource->uriList)) {
                $route->callController($resource, $request, $uriInfo);
            }
        };
    }


    /**
     * Get URI and their params
     * E.q for path /users/bob/posts/999
     * E.q: ['uri' => 'users/{key}posts/{key}', 'params' ['users' => 'bob', 'posts' => 999]]
     *
     * @param string $path The request path
     *
     * @return arrray
     */
    public function getUriInfo($path)
    {
        $path = Str::of($path)->ltrim('/')->rtrim('/');
        $parts = explode("/", $path);
        $params = [];
        $uri = '';

        foreach ($parts as $index => $part) {
            $isResourceString = in_array($part, $this->resourceKeys);
            if ($index === 0 && ! $isResourceString) {
                throw new \Exception('Bad Url');
            }

            $isResourceVerb = in_array($part, self::$verbs);

            if ($isResourceVerb) {
                $uri .= $part;
                break;
            }

            if ($isResourceString) {
                $params[$part] = '';
                $uri .= "$part/";
            } else {
                $params[array_key_last($params)] = $part;
                $singular = Str::singular(array_key_last($params));
                $uri .= "{{$singular}}/";
            }
        }

        foreach ($params as $key => $value) {
            unset($params[$key]);
            $params[Str::singular($key)] = $value;
        }
        return [
            'uri' => (string) Str::of($uri)->rtrim('/'),
            'params' => $params
        ];
    }

    /**
     * Find controller and instantiate it
     *
     * @param Resource $resource The Resource verb
     * @param Request $request The request
     * @param array $uriInfo The url info
     *
     * @return void
     */
    public function callController(Resource $resource, Request $request, array $uriInfo)
    {
        $app = Application::getInstance();
        try {
            $controllerClassName = $app->controllerUris[$resource->uri];
            $controllerName = "Goodquestiondev\\Controllers\\{$controllerClassName}";
            $controller = new $controllerName;
        } catch (\Exception $e) {
            throw new \Exception('Error getting Controller');
        }
        $this->callAction($controller, $resource, $request, $uriInfo);
    }

    /**
     * Call the Controller method
     *
     * @param Controller $controller The controller
     * @param Resource $resource The Resource verb
     * @param Request $request The request
     *
     * @return void
     */
    public function callAction(Controller $controller, Resource $resource, Request $request, array $uriInfo)
    {
        $path = $request->getPathInfo();
        switch ($request->getMethod()) {
            case 'GET':
                if (Str::contains($path, 'create')) {
                    $controller->create();
                    break;
                }
                if (Str::contains($path, 'edit')) {
                    $controller->edit($uriInfo['params']);
                    break;
                }
                if (Str::contains($uriInfo['uri'], '{')) {
                    $controller->show($uriInfo['params']);
                    break;
                }
                $controller->index();

                break;
            case 'POST':
                $controller->store($request);
                break;
            case 'PUT':
            case 'PATCH':
                $controller->update($request, $uriInfo['params']);
                break;
            case 'DELETE':
                $controller->destroy($uriInfo['params']);
                break;
            default:
                $controller->error($request);
        }
    }
}