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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Common Spout class for dataformat.
 *
 * @package    core
 * @subpackage dataformat
 * @copyright  2016 Brendan Heywood (brendan@catalyst-au.net)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace core\dataformat;

/** @var $spouttype */
    protected $spouttype = '';

/** @var $writer */
    protected $writer;

/** @var $sheettitle */
    protected $sheettitle;

/** @var $renamecurrentsheet */
    protected $renamecurrentsheet = false;

/**
     * Output file headers to initialise the download of the file.
     */
    public function send_http_headers() {
        $this->writer = \Box\Spout\Writer\WriterFactory::create($this->spouttype);
        if (method_exists($this->writer, 'setTempFolder')) {
            $this->writer->setTempFolder(make_request_directory());
        }
        $filename = $this->filename . $this->get_extension();
        $this->writer->openToBrowser($filename);

// By default one sheet is always created, but we want to rename it when we call start_sheet().
        $this->renamecurrentsheet = true;
    }

/**
     * Set the title of the worksheet inside a spreadsheet
     *
     * For some formats this will be ignored.
     *
     * @param string $title
     */
    public function set_sheettitle($title) {
        $this->sheettitle = $title;
    }

/**
     * Write the start of the sheet we will be adding data to.
     *
     * @param array $columns
     */
    public function start_sheet($columns) {
        if ($this->sheettitle && $this->writer instanceof \Box\Spout\Writer\AbstractMultiSheetsWriter) {
            if ($this->renamecurrentsheet) {
                $sheet = $this->writer->getCurrentSheet();
                $this->renamecurrentsheet = false;
            } else {
                $sheet = $this->writer->addNewSheetAndMakeItCurrent();
            }
            $sheet->setName($this->sheettitle);
        }
        $this->writer->addRow(array_values((array)$columns));
    }

/**
     * Write a single record
     *
     * @param object $record
     * @param int $rownum
     */
    public function write_record($record, $rownum) {
        $this->writer->addRow(array_values((array)$record));
    }

/**
     * Write the end of the file.
     */
    public function close_output() {
        $this->writer->close();
        $this->writer = null;
    }
}