<?php
    require_once( 'Config.php' );
    require_once( 'Controllers.php' );
    require_once( 'Database.php' );
    require_once( 'Linker.php' );

    class Zyphr{
        private $oDb = null;
        private $oLastController = null;
        static $oApp = null;

        static $szControllerName = '';
        static $szMethodName ='';

        public static function Load(){
            if( Zyphr::$oApp == null ){
                Zyphr::$oApp = new Zyphr();
            }

            Zyphr::$oApp->StartApplication();
        }

        private function GenException( $szException ){
            throw new Excepton( $szException );
        }

        private function ControllerClassName( $szController ){
            return ucfirst( strtolower( $szController ) )."Controller";
        }

        private function LoadController( $szController, $szMethod, $pParams ){
            $szClassName = $this->ControllerClassName( $szController );

            $this->oLastController = new $szClassName;

            /******
            Checar número de parâmetros
            ****/

            Zyphr::$szControllerName = $szController;
            Zyphr::$szMethodName = $szMethod;

            call_user_func( array( $this->oLastController, $szMethod ), $pParams );
        }

        private function ControllerExists( $szController ){
            if( !class_exists( $this->ControllerClassName( $szController ) ) ){
                return false;
            }

            return true;
        }

        private function ControllerActionExists( $szController, $szAction ){
            try{
                $pReflection = new ReflectionMethod( $this->ControllerClassName( $szController ), $szAction );

                return true;
            }catch( Exception $e ){
                return false;
            }
        }

        private function ParseArgs(){
            $config = $GLOBALS['config'];

            $szReference = isset( $_GET['Reference'] ) ? $_GET['Reference'] : '';
            $pActions = explode( '/', $szReference );

            if( in_array( '', $pActions ) ){
                unset( $pActions[array_search( '', $pActions )] );
            }

            $nParamsLen = sizeof( $pActions );

            if( $nParamsLen == 0 ){
                $szController = $config['default_controller'];
                $szMethod = $config['default_method'];
                $pParams = array();

                if( !$this->ControllerExists( $szController ) ){
                    throw new Exception( "Não foi possível encontrar a classe responsável pelo controller <b>{$szController}</b>.");
                }

                if( !$this->ControllerActionExists( $szController, $szMethod ) ){
                    throw new Exception( "Não foi possível encontrar a action <b>{$szMethod}</b> no controller <b>{$szController}</b>." );
                }
            }elseif( $nParamsLen == 1 ){
                $szController = $pActions[0];

                if( !$this->ControllerExists( $szController ) ){
                    $szMethod = $szController;
                    $szController = $config['default_controller'];

                    if( !$this->ControllerActionExists( $szController, $szMethod ) ){
                        throw new Exception( "Não foi possível encontrar o controlador <b>{$szMethod}</b>.");
                    }
                }else{
                    $szMethod = $config['default_method'];

                    if( !$this->ControllerActionExists( $szController, $config['default_method'] ) ){
                        throw new Exception( "Não foi possível encontrar a ação <b>{$szMethod}</b> no controlador <b>{$szController}</b>.");
                    }
                }

                $pParams = array();
            }elseif( $nParamsLen == 2 ){
                $szController = $pActions[0];
                $szMethod = $pActions[1];
                $pParams = array();

            }elseif( $nParamsLen > 2 ){
                $szController = $pActions[0];
                $szMethod = $pActions[1];
                $pParams = array_slice( $pActions, 2 );

            }

            $this->LoadController( $szController, $szMethod, $pParams );
        }

        private function LoadControllers(){
            if( $pDir = opendir( 'Application/Controller' ) ){
                while( ( $pFile = readdir( $pDir ) ) !== false ){
                    if( $pFile != "." && $pFile != ".." ){
                        require_once( "Application/Controller/{$pFile}" );
                    }
                }
            }
        }

        private function StartApplication(){
            try{
                if( $this->oDb == null ){
                    $this->oDb = new Database();
                }

                $this->oDb->Open();

                $this->LoadControllers();
                $this->ParseArgs();
            }catch( Exception $e ){
                $this->LoadController( 'error', 'index', $e->getMessage() );
            }
        }
    }
?>