<?php
// This file is part of the customcert module for 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/>.

defined('MOODLE_INTERNAL') || die('Direct access to this script is forbidden.');

require_once($CFG->dirroot . '/mod/customcert/element/element.class.php');

/**
 * The customcert element border's core interaction API.
 *
 * @package    customcertelement_border
 * @copyright  2013 Mark Nelson <markn@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class customcert_element_border extends customcert_element_base {

    /**
     * This function renders the form elements when adding a customcert element.
     *
     * @param mod_customcert_edit_element_form $mform the edit_form instance
     */
    public function render_form_elements($mform) {
        // We want to define the width of the border.
        $mform->addElement('text', 'width', get_string('width', 'customcertelement_border'), array('size' => 10));
        $mform->setType('width', PARAM_INT);
        $mform->addHelpButton('width', 'width', 'customcertelement_border');

        // The only other thing to define is the colour we want the border to be.
        parent::render_form_element_colour($mform);
    }

    /**
     * Handles rendering the element on the pdf.
     *
     * @param pdf $pdf the pdf object
     * @param bool $preview true if it is a preview, false otherwise
     */
    public function render($pdf, $preview) {
        $colour = TCPDF_COLORS::convertHTMLColorToDec($this->element->colour, $colour);
        $pdf->SetLineStyle(array('width' => $this->element->data, 'color' => $colour));
        $pdf->Line(0, 0, $pdf->getPageWidth(), 0);
        $pdf->Line($pdf->getPageWidth(), 0, $pdf->getPageWidth(), $pdf->getPageHeight());
        $pdf->Line(0, $pdf->getPageHeight(), $pdf->getPageWidth(), $pdf->getPageHeight());
        $pdf->Line(0, 0, 0, $pdf->getPageHeight());
    }

    /**
     * Render the element in html.
     *
     * This function is used to render the element when we are using the
     * drag and drop interface to position it.
     */
    public function render_html() {
        return '';
    }

    /**
     * Performs validation on the element values.
     *
     * @param array $data the submitted data
     * @param array $files the submitted files
     * @return array the validation errors
     */
    public function validate_form_elements($data, $files) {
        // Array to return the errors.
        $errors = array();

        // Check if width is not set, or not numeric or less than 0.
        if ((!isset($data['width'])) || (!is_numeric($data['width'])) || ($data['width'] <= 0)) {
            $errors['width'] = get_string('invalidwidth', 'customcertelement_border');
        }

        // Validate the colour.
        $errors += $this->validate_form_element_colour($data);

        return $errors;
    }

    /**
     * Sets the data on the form when editing an element.
     *
     * @param mod_customcert_edit_element_form $mform the edit_form instance
     */
    public function definition_after_data($mform) {
        $this->element->width = $this->element->data;
        parent::definition_after_data($mform);
    }

    /**
     * This will handle how form data will be saved into the data column in the
     * customcert_elements table.
     *
     * @param stdClass $data the form data
     * @return string the json encoded array
     */
    public function save_unique_data($data) {
        return $data->width;
    }
}