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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/>.

/**
 * Base 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 $mimetype */
    protected $mimetype = "text/plain";

/** @var $extension */
    protected $extension = ".txt";

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

/**
     * Get the file extension
     *
     * @return string file extension
     */
    public function get_extension() {
        return $this->extension;
    }

/**
     * Set download filename base
     *
     * @param string $filename
     */
    public function set_filename($filename) {
        $this->filename = $filename;
    }

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

/**
     * Output file headers to initialise the download of the file.
     */
    public function send_http_headers() {
        if (defined('BEHAT_SITE_RUNNING')) {
            // For text based formats - we cannot test the output with behat if we force a file download.
            return;
        }
        if (is_https()) {
            // HTTPS sites - watch out for IE! KB812935 and KB316431.
            header('Cache-Control: max-age=10');
            header('Pragma: ');
        } else {
            // Normal http - prevent caching at all cost.
            header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
            header('Pragma: no-cache');
        }
        header('Expires: '. gmdate('D, d M Y H:i:s', 0) .' GMT');
        header("Content-Type: $this->mimetype\n");
        $filename = $this->filename . $this->get_extension();
        header("Content-Disposition: attachment; filename=\"$filename\"");
    }

/**
     * Write the start of the file.
     */
    public function start_output() {
        // Override me if needed.
    }

/**
     * Write the start of the sheet we will be adding data to.
     *
     * @param array $columns
     */
    public function start_sheet($columns) {
        // Override me if needed.
    }

/**
     * Write a single record
     *
     * @param array $record
     * @param int $rownum
     */
    abstract public function write_record($record, $rownum);

/**
     * Write the end of the sheet containing the data.
     *
     * @param array $columns
     */
    public function close_sheet($columns) {
        // Override me if needed.
    }

/**
     * Write the end of the file.
     */
    public function close_output() {
        // Override me if needed.
    }
}