<?php
/**
 * Configuration management
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade this module to newer
 * versions in the future. If you wish to customize this module for your
 * needs please refer to http://doc.prestashop.com/display/PS15/Overriding+default+behaviors
 * #Overridingdefaultbehaviors-Overridingamodule%27sbehavior for more information.
 *
 * @author    Samdha <contact@samdha.net>
 * @copyright Samdha
 * @license   commercial license see license.txt
 * @category  Prestashop
 * @category  Module
 */
namespace Samdha\Module;

class Configuration
{
    private $prefix;
    private $module;
    private $datas = array();
    private $initialised = false;
    const COMA_REPLACE = '%C0MA%';

    public function __construct($module)
    {
        $this->module = $module;
        $this->prefix = $module->short_name;
    }

    public function __get($key)
    {
        if (!$this->initialised) {
            $this->init();
        }
        if (array_key_exists($key, $this->datas)) {
            return $this->datas[$key];
        }
    }

    public function __set($key, $value)
    {
        if (!$this->initialised) {
            $this->init();
        }
        if (array_key_exists($key, $this->datas) && ($this->datas[$key] != $value)) {
            $this->datas[$key] = $value;
            $this->saveKey($key);
        }
    }

    public function __isset($key)
    {
        if (!$this->initialised) {
            $this->init();
        }
        return (array_key_exists($key, $this->datas));
    }

    /**
     * get configuration datas as array
     * @return array
     **/
    public function getAsArray()
    {
        if (!$this->initialised) {
            $this->init();
        }
        return $this->datas;
    }

    private function isGlobalConfig()
    {
        static $result;
        if (!isset($result)) {
            $result = $this->module->config_global && version_compare(_PS_VERSION_, '1.5.0.0', '>=');
        }
        return $result;
    }

    /**
     * get module config
     * and put it in $this->datas
     **/
    public function init()
    {
        // get real config
        $this->datas = $this->module->getDefaultConfig();
        if (method_exists('Configuration', 'hasKey')) {
            $config_global = $this->isGlobalConfig();
            if ($config_global) {
                $id_shop = null;
                $id_shop_group = null;
            } else {
                $id_shop = \Shop::getContextShopID(true);
                $id_shop_group = \Shop::getContextShopGroupID(true);
            }

            foreach (array_keys($this->datas) as $key) {
                $full_key = $this->prefix.$key;
                if (\Configuration::hasKey($full_key, null, $id_shop_group, $id_shop)) {
                    if ($config_global) {
                        $this->datas[$key] = \Configuration::getGlobalValue($full_key);
                    } else {
                        $this->datas[$key] = \Configuration::get($full_key);
                    }
                }
            }
        } else {
            $keys = array();
            foreach (array_keys($this->datas) as $key) {
                $keys[] = $this->prefix.$key;
            }
            $datas = \Configuration::getMultiple($keys);
            $prefix_length = \Tools::strlen($this->prefix);
            foreach ($datas as $key => $value) {
                $this->datas[\Tools::substr($key, $prefix_length)] = $value;
            }
        }

        // restore array values
        foreach ($this->module->config_arrays_keys as $key) {
            if (!isset($this->datas[$key])
                || is_null($this->datas[$key])
                || ($this->datas[$key] === '')
            ) {
                $this->datas[$key] = array();
            } elseif (!is_array($this->datas[$key])) {
                $this->datas[$key] = explode(',', $this->datas[$key]);
                foreach ($this->datas[$key] as $id => $value) {
                    $this->datas[$key][$id] = str_replace(self::COMA_REPLACE, ',', $value);
                }
            }
        }
        $this->initialised = true;
    }

    /**
     * get configurations from an array
     * @param array $datas
     **/
    public function update($datas)
    {
        if (is_array($datas)) {
            if (!$this->initialised) {
                $this->init();
            }
            foreach ($datas as $key => $value) {
                if (array_key_exists($key, $this->datas)) {
                    $this->datas[$key] = $value;
                }
            }
            $this->save();
        }
    }

    /**
     * Save configuration to database
     **/
    public function save()
    {
        $keys = array_keys($this->datas);
        foreach ($keys as $key) {
            $this->saveKey($key);
        }
        $this->module->postsaveConfig();
    }

    public function saveKey($key)
    {
        if (array_key_exists($key, $this->datas)) {
            $value = $this->datas[$key];
            if (in_array($key, $this->module->config_arrays_keys)) {
                $value = str_replace(',', self::COMA_REPLACE, $value);
                $value = implode(',', $value);
            }
            $full_key = $this->prefix.$key;
            if ($this->isGlobalConfig()) {
                \Configuration::updateGlobalValue($full_key, $value.'1', true);
                \Configuration::updateGlobalValue($full_key, $value, true);
            } else {
                // there is a bug when adding (not update) html
                // configuration. So we update twice
                \Configuration::updateValue($full_key, $value.'1', true);
                \Configuration::updateValue($full_key, $value, true);
            }
        }
    }

    /**
     * remove module config from database
     **/
    public function delete()
    {
        $this->init();
        foreach (array_keys($this->datas) as $key) {
            \Configuration::deleteByName($this->prefix.$key);
        }
        $this->initialised = false;
        return true;
    }
}