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<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license  https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Model;

trait Resource {

    /**
     * @inheritDocs
     * @param array|NULL    $args               Values array with variables to pass into resource `__construct()` method.
     * @param string        $resourceClassPath  Automatically initialized with string replaced with `%SELF%` by `get_called_class()`.
     * @return \MvcCore\Model
     */
    public static function GetResource ($args = [], $resourceClassPath = '%SELF%s\Resource') {
        static $__resources = [];
        
        $staticClassPath = get_called_class();
        $cacheKey = implode('|', [$staticClassPath, serialize($args)]);
        
        if (isset($__resources[$cacheKey])) 
            return $__resources[$cacheKey];

        $resource = NULL;
        $namespaceSeparator = strpos($staticClassPath, '\\') === FALSE ? '_' : '\\';
        $staticClassPathExpl = explode($namespaceSeparator, $staticClassPath);
        $resourceClassPathExpl = explode($namespaceSeparator, $resourceClassPath);
        $resourceClassPathArr = [];
        foreach ($resourceClassPathExpl as $key => $resourceClassPathItem) {
            $selfMatched = mb_strpos($resourceClassPathItem, '%SELF%') !== FALSE;
            if ($selfMatched) {
                $resourceClassPathItem = str_replace('%SELF%', $staticClassPath, $resourceClassPathItem);
                $resourceClassPathItemExpl = explode($namespaceSeparator, $resourceClassPathItem);
                $resourceClassPathArr = array_merge($resourceClassPathArr, $resourceClassPathItemExpl);
            } else if ($resourceClassPathItem === '.') {
                if ($key === 0) {
                    unset($staticClassPathExpl[count($staticClassPathExpl) - 1]);
                    $resourceClassPathArr = array_merge([], $staticClassPathExpl);
                }
                continue;
            } else if ($resourceClassPathItem === '..') {
                if ($key === 0) {
                    unset($staticClassPathExpl[count($staticClassPathExpl) - 1]);
                    $resourceClassPathArr = array_merge([], $staticClassPathExpl);
                }
                unset($resourceClassPathArr[count($resourceClassPathArr) - 1]);
            } else {
                $resourceClassPathArr[] = $resourceClassPathItem;
            }
        }
        $resourceClassName = implode($namespaceSeparator, $resourceClassPathArr);

        // Do not create resource instance if resource class doesn't exist:
        if (class_exists($resourceClassName)) {
            $reflectionClass = new \ReflectionClass($resourceClassName);
            $resource = $reflectionClass->newInstanceArgs($args);
        } else {
            throw new \InvalidArgumentException("Class `{$resourceClassName}` doesn't exist.");
        }

        $__resources[$cacheKey] = $resource;

        return $resource;
    }
}