<?php 
    /**
    * Class exposing a Limesurvey API to plugins.
    * This class is instantiated by the plugin manager,
    * plugins can obtain it by calling getAPI() on the plugin manager.
    */
    class LimesurveyApi
    {
        /**
         * Read a key from the application config, and when not set
         * return the default value
         * 
         * @param string $key          The key to search for in the application config
         * @param mixed  $defaultValue Value to return when not found, default is false
         * @return mixed
         */
        public function getConfigKey($key, $defaultValue = false)
        {
            return App()->getConfig($key, $defaultValue);
        }
        
        /**
         * Generates the real table name from plugin and tablename.
         * @param iPlugin $plugin
         * @param string $tableName
         */
        protected function getTableName(iPlugin $plugin, $tableName)
        {
            return App()->getDb()->tablePrefix . strtolower($plugin->getName()) . "_$tableName";
        }
        /**
        * Sets a flash message to be shown to the user.
        * @param html $message
        */
        public function setFlash($message, $key ='api')
        {
            // @todo Remove direct session usage.
            Yii::app()->user->setFlash($key, $message);
        }

        /**
        * Builds and executes a SQL statement for creating a new DB table.
        * @param mixed $plugin The plugin object, id or name.
        * @param string $sTableName the name of the table to be created. The name will be properly quoted and prefixed by the method.
        * @param array $aColumns the columns (name=>definition) in the new table.
        * @param string $sOptions additional SQL fragment that will be appended to the generated SQL.
        * @return integer number of rows affected by the execution.
        */        
        public function createTable($plugin, $sTableName, $aColumns, $sOptions=null)
        {
            if (null !== $sTableName = $this->getTableName($plugin, $sTableName))
            {
                return App()->getDb()->createCommand()->createTable($sTableName,$aColumns,$sOptions);
            }
            return false;
        }

        /**
         * Builds and executes a SQL statement for dropping a DB table.
         * @param mixed $plugin The plugin object, id or name.
         * @param string $sTableName the name of the table to be created. The name will be properly quoted and prefixed by the method.
         */
        public function dropTable($plugin, $sTableName)
        {
            if (null !== $sTableName = $this->getTableName($plugin, $sTableName))
            {
                return App()->getDb()->createCommand()->dropTable($sTableName);
            }
            return false;
        }

        public function createUrl($route, array $params)
        {
            return App()->createAbsoluteUrl($route, $params);
        }

        /**
         * Gets an activerecord object associated to the table.
         * @param iPlugin $plugin
         * @param string $sTableName Name of the table.
         * @param string $bPluginTable True if the table is plugin specific.
         * @return PluginDynamic
         */
        public function getTable(iPlugin $plugin, $sTableName, $bPluginTable = true)
        {
            if ($bPluginTable)
            {
                $table = $this->getTableName($plugin, $sTableName);
            }
            else
            {
                $table = $sTableName;
            }
            if (isset($table))
            {
                return PluginDynamic::model($table);
            }
        }

        /**
         * @see http://www.yiiframework.com/doc/api/1.1/CWebUser#checkAccess-detail
         * @param string $operation
         * @param array $params
         * @param boolean $allowCaching
         * @return boolean
         */
        public function checkAccess($operation, $params = array(), $allowCaching = true)
        {
            return App()->user->checkAccess($operation, $params, $allowCaching);
        }
        /**
         * Creates a new active record object instance.
         * @param iPlugin $plugin
         * @param string $sTableNamem
         * @param string $scenario
         * @param string $bPluginTable True if the table is plugin specific.
         * @return PluginDynamic
         */
        public function newModel(iPlugin $plugin, $sTableName, $scenario = 'insert', $bPluginTable = true)
        {
            if ($bPluginTable)
            {
                $table = $this->getTableName($plugin, $sTableName);
            }
            else
            {
                $table = $sTableName;
            }
            if (isset($table))
            {
                return new PluginDynamic($table, $scenario);
            }
        }

        public function removeResponse($surveyId, $responseId)
        {
            return Response::model($surveyId)->deleteByPk($responseId);
        }
        /**
        * Check if a table does exist in the database
        * @param mixed $plugin
        * @param string $sTableName Table name to check for (without dbprefix!))
        * @return boolean True or false if table exists or not
        */
        public function tableExists(iPlugin $plugin, $sTableName)
        {
            $sTableName =  $this->getTableName($plugin, $sTableName);
            return isset($sTableName) && in_array($sTableName, App()->getDb()->getSchema()->getTableNames());
        }

        /**
        * Evaluates an expression via Expression Manager
        * Uses the current context.
        * @param string $expression
        * @return string
        */
        public function EMevaluateExpression($expression)
        {
            $result = LimeExpressionManager::ProcessString($expression);
            return $result;
        }
        
        /**
         * Get the current request object
         * 
         * @return LSHttpRequest
         */
        public function getRequest()
        {
            return App()->getRequest();
        }

        /**
        * Gets a survey response from the database.
        * 
        * @param int $surveyId
        * @param int $responseId
        */
        public function getResponse($surveyId, $responseId)
        {
            $response = SurveyDynamic::model($surveyId)->findByPk($responseId);
            if (isset($response))
            {
                // Now map the response to the question codes if possible, duplicate question codes will result in the
                // old sidXgidXqid code for the second time the code is found
                $fieldmap = createFieldMap($surveyId, 'full',null, false, $response->attributes['startlanguage']);
                $output = array();
                foreach($response->attributes as $key => $value)
                {
                    $newKey = $key;
                    if (array_key_exists($key, $fieldmap)) {
                        if (array_key_exists('title', $fieldmap[$key]))
                        {
                            $code = $fieldmap[$key]['title'];
                            // Add subquestion code if needed
                            if (array_key_exists('aid', $fieldmap[$key]) && isset($fieldmap[$key]['aid']) && $fieldmap[$key]['aid']!='') {
                                $code .= '_' . $fieldmap[$key]['aid'];
                            }
                            // Only add if the code does not exist yet and is not empty
                            if (!empty($code) && !array_key_exists($code, $output)) {
                                $newKey = $code;
                            }
                        }
                    }
                    $output[$newKey] = $value;
                }

                // And return the mapped response, to further enhance we could add a method to the api that provides a
                // simple sort of fieldmap that returns qcode index array with group, question, subquestion,
                // possible answers, maybe even combined with relevance info so a plugin can handle display of the response
                return $output;
            }
        }

        public function getResponses($surveyId, $attributes = array(), $condition = '', $params = array())
        {
            return Response::model($surveyId)->findAllByAttributes($attributes, $condition, $params);
        }


        public function getToken($surveyId, $token)
        {
            return Token::model($surveyId)->findByAttributes(array('token' => $token));
        }
        /**
        * Gets a key value list using the group name as value and the group id
        * as key.
        * @param type $surveyId
        * @return type
        */
        public function getGroupList($surveyId)
        {
            $result = QuestionGroup::model()->findListByAttributes(array('sid' => $surveyId), 'group_name');
            return $result;
        }
        
        /**
        * Retrieves user details for the currently logged in user
        * Returns false if the user is not logged and returns null if the user does not exist anymore for some reason (should not really happen)
        * @return User
        */
        public function getCurrentUser(){
            if (Yii::app()->user->id)
            {
                return User::model()->findByPk(Yii::app()->user->id);
            }
            return false;
        }

        /**
         * Gets the table name for responses for the specified survey id.
         * @param int $surveyId
         * @return string
         */
        public function getResponseTable($surveyId)
        {
            return App()->getDb()->tablePrefix . 'survey_' . $surveyId;
        }

        /**
         * Gets an array of old response table names for a survey.
         * @param int $surveyId
         * @return string[]
         */
        public function getOldResponseTables($surveyId)
        {
            $tables = array();
            $base = App()->getDb()->tablePrefix . 'old_survey_' . $surveyId;
            foreach (App()->getDb()->getSchema()->getTableNames() as $table)
            {
                if (strpos($table, $base) === 0)
                $tables[] = $table;
            }
            return $tables;
        }
        /**
         * Retrieves user details for a user
         * Returns null if the user does not exist anymore for some reason (should not really happen)
         * 
         * @param int $iUserID The userid
         * @return User
         */
        public function getUser($iUserID){
            return User::model()->findByPk($iUserID);
        }
        
        /**
         * Get the user object for a given username
         * 
         * @param string $username
         * @return User|null Returns the user, or null when not found
         */
        public function getUserByName($username)
        { 
            $user = User::model()->findByAttributes(array('users_name' => $username));

            return $user;
        }

        
        /**
        * Retrieves user permission details for a user
        * @param $iUserID int The User ID
        * @param  $iSurveyID int The related survey IF for survey permissions - if 0 then global permissions will be retrieved
        * Returns null if the user does not exist anymore for some reason (should not really happen)
        * @return User
        */
        public function getPermissionSet($iUserID, $iEntityID=null, $sEntityName=null){
            return Permission::model()->getPermissions($iUserID, $iEntityID, $sEntityName);
        }        
        
        /**
        * Retrieves Participant data
        * @param $iParticipantID int The Participant ID
        * Returns null if the user does not exist anymore for some reason (should not really happen)
        * @return User
        */
        public function getParticipant($iParticipantID){
            return Participant::model()->findByPk($iParticipantID);
        }

        public function getQuestions($surveyId, $language = 'en', $conditions = array())
        {
            $conditions['sid'] = $surveyId;
            $conditions['language'] = $language;
            return Question::model()->with('subquestions')->findAllByAttributes($conditions);
        }
        /**
         * Gets the metadata for a table.
         * For details on the object check: http://www.yiiframework.com/doc/api/1.1/CDbTableSchema
         * @param string $table Table name.
         * @param boolean $forceRefresh False if cached information is acceptable; setting this to true could affect performance.
         * @return CDbTableSchema Table schema object, NULL if the table does not exist.
         */
        public function getTableSchema($table, $forceRefresh = false)
        {
            return App()->getDb()->getSchema()->getTable($table);
        }
        
    }

?>