<?php

defined('BASEPATH') or exit('No direct script access allowed');

/**
 * Modular Extensions - HMVC
 *
 * Adapted from the CodeIgniter Core Classes
 * @link	http://codeigniter.com
 *
 * Description:
 * This library extends the CodeIgniter CI_Loader class
 * and adds features allowing use of modules and the HMVC design pattern.
 *
 * Install this file as application/third_party/MX/Loader.php
 *
 * @copyright	Copyright (c) 2015 Wiredesignz
 * @version 	5.5
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * */
class MX_Loader extends CI_Loader
{
    protected $_module;
    public $_ci_plugins = [];
    public $_ci_cached_vars = [];

    /** Initialize the loader variables * */
    public function initialize($controller = null)
    {
        /* set the module name */
        $this->_module = CI::$APP->router->fetch_module();

        if ($controller instanceof MX_Controller) {
            /* reference to the module controller */
            $this->controller = $controller;

            /* references to ci loader variables */
            foreach (get_class_vars('CI_Loader') as $var => $val) {
                if ($var != '_ci_ob_level') {
                    $this->$var = &CI::$APP->load->$var;
                }
            }
        } else {
            parent::initialize();

            /* autoload module items */
            $this->_autoloader([]);
        }

        /* add this module path to the loader variables */
        $this->_add_module_paths($this->_module);
    }

    /** Add a module path loader variables * */
    public function _add_module_paths($module = '')
    {
        if (empty($module)) {
            return;
        }

        foreach (Modules::$locations as $location => $offset) {
            /* only add a module path if it exists */
            if (is_dir($module_path = $location . $module . '/') && !in_array($module_path, $this->_ci_model_paths)) {
                array_unshift($this->_ci_model_paths, $module_path);
            }
        }
    }

    /** Load a module config file * */
    public function config($file, $use_sections = false, $fail_gracefully = false)
    {
        return CI::$APP->config->load($file, $use_sections, $fail_gracefully, $this->_module);
    }

    /** Load the database drivers * */
    public function database($params = '', $return = false, $query_builder = null)
    {
        if (
            $return === false &&
            $query_builder === null &&
            isset(CI::$APP->db) &&
            is_object(CI::$APP->db) &&
            !empty(CI::$APP->db->conn_id)
        ) {
            return false;
        }

        require_once BASEPATH . 'database/DB' . EXT;

        if ($return === true) {
            return DB($params, $query_builder);
        }

        CI::$APP->db = DB($params, $query_builder);

        return $this;
    }

    /** Load a module helper * */
    public function helper($helper = [])
    {
        if (is_array($helper)) {
            return $this->helpers($helper);
        }

        if (isset($this->_ci_helpers[$helper])) {
            return;
        }

        [$path, $_helper] = Modules::find($helper . '_helper', $this->_module, 'helpers/');

        if ($path === false) {
            return parent::helper($helper);
        }

        Modules::load_file($_helper, $path);
        $this->_ci_helpers[$_helper] = true;
        return $this;
    }

    /** Load an array of helpers * */
    public function helpers($helpers = [])
    {
        foreach ($helpers as $_helper) {
            $this->helper($_helper);
        }
        return $this;
    }

    /** Load a module language file * */
    public function language($langfile, $idiom = '', $return = false, $add_suffix = true, $alt_path = '')
    {
        CI::$APP->lang->load($langfile, $idiom, $return, $add_suffix, $alt_path, $this->_module);
        return $this;
    }

    public function languages($languages)
    {
        foreach ($languages as $_language) {
            $this->language($_language);
        }
        return $this;
    }

    /** Load a module library * */
    public function library($library, $params = null, $object_name = null)
    {
        if (is_array($library)) {
            return $this->libraries($library);
        }

        $class = strtolower(basename($library));

        if (isset($this->_ci_classes[$class]) && ($_alias = $this->_ci_classes[$class])) {
            return $this;
        }

        ($_alias = strtolower($object_name)) or ($_alias = $class);

        [$path, $_library] = Modules::find($library, $this->_module, 'libraries/');

        /* load library config file as params */
        if ($params == null) {
            [$path2, $file] = Modules::find($_alias, $this->_module, 'config/');
            $path2 && ($params = Modules::load_file($file, $path2, 'config'));
        }

        if ($path === false) {
            $this->_ci_load_library($library, $params, $object_name);
        } else {
            Modules::load_file($_library, $path);

            $library = ucfirst($_library);
            CI::$APP->$_alias = new $library($params);

            $this->_ci_classes[$class] = $_alias;
        }
        return $this;
    }

    /** Load an array of libraries * */
    public function libraries($libraries)
    {
        foreach ($libraries as $library => $alias) {
            is_int($library) ? $this->library($alias) : $this->library($library, null, $alias);
        }
        return $this;
    }

    /** Load a module model * */
    public function model($model, $object_name = null, $connect = false)
    {
        if (is_array($model)) {
            return $this->models($model);
        }

        ($_alias = $object_name) or ($_alias = basename($model));

        if (in_array($_alias, $this->_ci_models, true)) {
            return $this;
        }

        /* check module */
        [$path, $_model] = Modules::find(strtolower($model), $this->_module, 'models/');

        if ($path == false) {
            /* check application & packages */
            parent::model($model, $object_name, $connect);
        } else {
            class_exists('CI_Model', false) or load_class('Model', 'core');

            if ($connect !== false && !class_exists('CI_DB', false)) {
                if ($connect === true) {
                    $connect = '';
                }
                $this->database($connect, false, true);
            }

            Modules::load_file($_model, $path);

            $model = ucfirst($_model);
            CI::$APP->$_alias = new $model();

            $this->_ci_models[] = $_alias;
        }
        return $this;
    }

    /** Load an array of models * */
    public function models($models)
    {
        foreach ($models as $model => $alias) {
            is_int($model) ? $this->model($alias) : $this->model($model, $alias);
        }
        return $this;
    }

    /** Load a module controller * */
    public function module($module, $params = null)
    {
        if (is_array($module)) {
            return $this->modules($module);
        }

        $_alias = strtolower(basename($module));
        CI::$APP->$_alias = Modules::load([$module => $params]);
        return $this;
    }

    /** Load an array of controllers * */
    public function modules($modules)
    {
        foreach ($modules as $_module) {
            $this->module($_module);
        }
        return $this;
    }

    /** Load a module plugin * */
    public function plugin($plugin)
    {
        if (is_array($plugin)) {
            return $this->plugins($plugin);
        }

        if (isset($this->_ci_plugins[$plugin])) {
            return $this;
        }

        [$path, $_plugin] = Modules::find($plugin . '_pi', $this->_module, 'plugins/');

        if ($path === false && !is_file($_plugin = APPPATH . 'plugins/' . $_plugin . EXT)) {
            show_error("Unable to locate the plugin file: {$_plugin}");
        }

        Modules::load_file($_plugin, $path);
        $this->_ci_plugins[$plugin] = true;
        return $this;
    }

    /** Load an array of plugins * */
    public function plugins($plugins)
    {
        foreach ($plugins as $_plugin) {
            $this->plugin($_plugin);
        }
        return $this;
    }

    /** Load a module view * */
    public function view($view, $vars = [], $return = false)
    {
        [$path, $_view] = Modules::find($view, $this->_module, 'views/');

        if ($path != false) {
            $this->_ci_view_paths = [$path => true] + $this->_ci_view_paths;
            $view = $_view;
        }

        return $this->_ci_load([
            '_ci_view' => $view,
            '_ci_vars' => method_exists($this, '_ci_object_to_array')
                ? $this->_ci_object_to_array($vars)
                : $this->_ci_prepare_view_vars($vars),
            '_ci_return' => $return,
        ]);
    }

    protected function &_ci_get_component($component)
    {
        return CI::$APP->$component;
    }

    public function __get($class)
    {
        return isset($this->controller) ? $this->controller->$class : CI::$APP->$class;
    }

    public function _ci_load($_ci_data)
    {
        extract($_ci_data);

        if (isset($_ci_view)) {
            $_ci_path = '';

            /* add file extension if not provided */
            $_ci_file = pathinfo($_ci_view, PATHINFO_EXTENSION) ? $_ci_view : $_ci_view . EXT;

            foreach ($this->_ci_view_paths as $path => $cascade) {
                if (file_exists($view = $path . $_ci_file)) {
                    $_ci_path = $view;
                    break;
                }
                if (!$cascade) {
                    break;
                }
            }
        } elseif (isset($_ci_path)) {
            $_ci_file = basename($_ci_path);
            if (!file_exists($_ci_path)) {
                $_ci_path = '';
            }
        }

        if (empty($_ci_path)) {
            show_error('Unable to load the requested file: ' . $_ci_file);
        }

        if (isset($_ci_vars)) {
            $this->_ci_cached_vars = array_merge($this->_ci_cached_vars, (array) $_ci_vars);
        }

        extract($this->_ci_cached_vars);

        ob_start();

        if ((bool) @ini_get('short_open_tag') === false && CI::$APP->config->item('rewrite_short_tags') == true) {
            echo eval(
                '?>' .
                    preg_replace('/;*\s*\?>/', '; ?>', str_replace('<?=', '<?php echo ', file_get_contents($_ci_path)))
            );
        } else {
            include $_ci_path;
        }

        log_message('debug', 'File loaded: ' . $_ci_path);

        if ($_ci_return == true) {
            return ob_get_clean();
        }

        if (ob_get_level() > $this->_ci_ob_level + 1) {
            ob_end_flush();
        } else {
            CI::$APP->output->append_output(ob_get_clean());
        }
    }

    /** Autoload module items * */
    public function _autoloader($autoload)
    {
        $path = false;

        if ($this->_module) {
            [$path, $file] = Modules::find('constants', $this->_module, 'config/');

            /* module constants file */
            if ($path != false) {
                include_once $path . $file . EXT;
            }

            [$path, $file] = Modules::find('autoload', $this->_module, 'config/');

            /* module autoload file */
            if ($path != false) {
                $autoload = array_merge(Modules::load_file($file, $path, 'autoload'), $autoload);
            }
        }

        /* nothing to do */
        if (count($autoload) == 0) {
            return;
        }

        /* autoload package paths */
        if (isset($autoload['packages'])) {
            foreach ($autoload['packages'] as $package_path) {
                $this->add_package_path($package_path);
            }
        }

        /* autoload config */
        if (isset($autoload['config'])) {
            foreach ($autoload['config'] as $config) {
                $this->config($config);
            }
        }

        /* autoload helpers, plugins, languages */
        foreach (['helper', 'plugin', 'language'] as $type) {
            if (isset($autoload[$type])) {
                foreach ($autoload[$type] as $item) {
                    $this->$type($item);
                }
            }
        }

        // Autoload drivers
        if (isset($autoload['drivers'])) {
            foreach ($autoload['drivers'] as $item => $alias) {
                is_int($item) ? $this->driver($alias) : $this->driver($item, $alias);
            }
        }

        /* autoload database & libraries */
        if (isset($autoload['libraries'])) {
            if (in_array('database', $autoload['libraries'])) {
                /* autoload database */
                if (!($db = CI::$APP->config->item('database'))) {
                    $this->database();
                    $autoload['libraries'] = array_diff($autoload['libraries'], ['database']);
                }
            }

            /* autoload libraries */
            foreach ($autoload['libraries'] as $library => $alias) {
                is_int($library) ? $this->library($alias) : $this->library($library, null, $alias);
            }
        }

        /* autoload models */
        if (isset($autoload['model'])) {
            foreach ($autoload['model'] as $model => $alias) {
                is_int($model) ? $this->model($alias) : $this->model($model, $alias);
            }
        }

        /* autoload module controllers */
        if (isset($autoload['modules'])) {
            foreach ($autoload['modules'] as $controller) {
                $controller != $this->_module && $this->module($controller);
            }
        }
    }
}

/** load the CI class for Modular Separation * */
class_exists('CI', false) or (require dirname(__FILE__) . '/Ci.php');
