<?php

/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2015 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

namespace oat\tao\model\import;

use oat\generis\model\GenerisRdf;

/**
 * Abstract class the describe a csv import
 *
 * @access public
 * @author Antoine Robin <antoine.robin@vesperiagroup.com
 * @package tao
 */
abstract class CsvAbstractImporter
{

    protected $validators = [];


    /**
     * Returns an array of the Uris of the properties
     * that should not be importable via CVS
     *
     * Can be overriden by CsvImporters that are adapted to
     * import resources of a specific class
     *
     * @return array
     */
    protected function getExludedProperties()
    {
        return [];
    }

    /**
     * Returns an key => value array of properties
     * to be set on the new resources
     *
     * Can be overriden by CsvImporters that are adapted to
     * import resources of a specific class
     *
     * @return array
     */
    protected function getStaticData()
    {
        return [];
    }

    /**
     * Returns aditional options to be set to the
     * GenericAdapterCsv
     *
     * Can be overriden by CsvImporters that are adapted to
     * import resources of a specific class
     *
     * @see tao_helpers_data_GenerisAdapterCsv
     * @return array
     */
    protected function getAdditionAdapterOptions()
    {
        return [];
    }

    /**
     * @return array
     */
    protected function getClassProperties($clazz)
    {
        $topLevelClass = new \core_kernel_classes_Class(GenerisRdf::CLASS_GENERIS_RESOURCE);
        $classProperties = \tao_models_classes_TaoService::singleton()->getClazzProperties($clazz, $topLevelClass);

        return $classProperties;
    }

    /**
     * @param \tao_helpers_data_CsvFile $csv_data
     * @param boolean $firstRowAsColumnName
     * @return array
     */
    protected function getColumnMapping($csv_data, $firstRowAsColumnName = true)
    {
        //build the mapping form
        if (!$csv_data->count()) {
            return [];
        }

        // 'class properties' contains an associative array(str:'propertyUri' => 'str:propertyLabel') describing properties belonging to the target class.
        // 'ranged properties' contains an associative array(str:'propertyUri' => 'str:propertyLabel')  describing properties belonging to the target class and that have a range.
        // 'csv_column' contains an array(int:columnIndex => 'str:columnLabel') that will be used to create the selection of possible CSV column to map in views.
        // 'csv_column' might have NULL values for 'str:columnLabel' meaning that there was no header row with column names in the CSV file.

        // Format the column mapping option for the form.
        if ($firstRowAsColumnName && null != $csv_data->getColumnMapping()) {
            // set the column label for each entry.
            // $csvColMapping = array('label', 'comment', ...)

            return $csv_data->getColumnMapping();
        } else {
            // set an empty value for each entry of the array
            // to describe that column names are unknown.
            // $csvColMapping = array(null, null, ...)

            return array_fill(0, $csv_data->getColumnCount(), null);
        }
    }

    /**
     * @return array
     */
    public function getValidators()
    {
        return $this->validators;
    }

    /**
     * @param array $validators
     */
    public function setValidators($validators)
    {
        $this->validators = $validators;
    }


    /**
     * Additional mapping values but that comes from another source than the CSV file.
     * It enables you to define a mapping that will to work along with the CSV mapping.
     *
     * @return the mapping in the same form than the staticData (uri -> val/uri)
     */
    public function getStaticMap()
    {
        return [];
    }


    /**
     * @param \core_kernel_classes_Class $class where data will be imported
     * @param array $options contains parameters under key => value format
     *  file => required
     *  map => required
     *  callbacks => optional
     *  field_delimiter => optional
     *  field_encloser => optional
     *  first_row_column_names => optional
     *  multi_values_delimiter => optional
     *  onResourceImported => optional
     *  staticMap => optional
     * @return \common_report_Report
     */
    public function importFile($class, $options)
    {
        if (!isset($options['file'])) {
            throw new \BadFunctionCallException("Import file is missing");
        }

        if (!isset($options['staticMap']) || !is_array($options['staticMap'])) {
            $options['staticMap'] = $this->getStaticData();
        } else {
            $options['staticMap'] = array_merge($options['staticMap'], $this->getStaticData());
        }
        $options = array_merge($options, $this->getAdditionAdapterOptions());

        //import the file
        $adapter = new \tao_helpers_data_GenerisAdapterCsv($options);
        $adapter->setValidators($this->getValidators());
        $report = $adapter->import($options['file'], $class);


        if ($report->getType() == \common_report_Report::TYPE_SUCCESS) {
            $report->setData($adapter->getOptions());
        }
        return $report;
    }
}