<?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/>.

/**
 * Overriden course topics format renderer.
 *
 * @package    theme_moove
 * @copyright  2017 Willian Mano - http://conecti.me
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

require_once($CFG->dirroot . '/course/format/topics/renderer.php');

/**
 * Rewrite format topics renderer base class
 *
 * @package    theme_moove
 * @copyright  2017 Willian Mano - http://conecti.me
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class theme_moove_format_topics_renderer extends format_topics_renderer {

    /**
     * Output the html for a single section page .
     *
     * @param stdClass $course The course entry from DB
     * @param array $sections (argument not used)
     * @param array $mods (argument not used)
     * @param array $modnames (argument not used)
     * @param array $modnamesused (argument not used)
     * @param int $displaysection The section number in the course which is being displayed
     */
    public function print_single_section_page($course, $sections, $mods, $modnames, $modnamesused, $displaysection) {
        $modinfo = get_fast_modinfo($course);
        $course = course_get_format($course)->get_course();

        // Can we view the section in question?
        if (!($sectioninfo = $modinfo->get_section_info($displaysection))) {
            // This section doesn't exist.
            print_error('unknowncoursesection', 'error', null, $course->fullname);
            return;
        }

        if (!$sectioninfo->uservisible) {
            if (!$course->hiddensections) {
                echo $this->start_section_list();
                echo $this->section_hidden($displaysection, $course->id);
                echo $this->end_section_list();
            }
            // Can't view this section.
            return;
        }

        // Copy activity clipboard..
        echo $this->course_activity_clipboard($course, $displaysection);
        $thissection = $modinfo->get_section_info(0);
        if ($thissection->summary or !empty($modinfo->sections[0]) or $this->page->user_is_editing()) {
            echo $this->start_section_list();
            echo $this->section_header($thissection, $course, true, $displaysection);
            echo $this->courserenderer->course_section_cm_list($course, $thissection, $displaysection);
            echo $this->courserenderer->course_section_add_cm_control($course, 0, $displaysection);
            echo $this->section_footer();
            echo $this->end_section_list();
        }

        // Start single-section div.
        echo html_writer::start_tag('div', array('class' => 'single-section'));

        // The requested section page.
        $thissection = $modinfo->get_section_info($displaysection);

        // Title with section navigation links.
        $sectionnavlinks = $this->get_nav_links($course, $modinfo->get_section_info_all(), $displaysection);
        $sectiontitle = '';
        $sectiontitle .= html_writer::start_tag('div', array('class' => 'section-navigation navigationtitle'));

        // Title attributes.
        $classes = 'sectionname';
        if (!$thissection->visible) {
            $classes .= ' dimmed_text';
        }
        $sectionname = html_writer::tag('span', $this->section_title_without_link($thissection, $course));
        $sectiontitle .= $this->output->heading($sectionname, 3, $classes);

        $sectiontitle .= html_writer::end_tag('div');
        echo $sectiontitle;

        // Now the list of sections..
        echo $this->start_section_list();

        echo $this->section_header($thissection, $course, true, $displaysection);
        // Show completion help icon.
        $completioninfo = new completion_info($course);
        echo $completioninfo->display_help_icon();

        echo $this->courserenderer->course_section_cm_list($course, $thissection, $displaysection);
        echo $this->courserenderer->course_section_add_cm_control($course, $displaysection, $displaysection);
        echo $this->section_footer();
        echo $this->end_section_list();

        // Display section bottom navigation.
        $sectionbottomnav = '';
        $sectionbottomnav .= html_writer::start_tag('div', array('class' => 'section-navigation mdl-bottom'));
        $sectionbottomnav .= html_writer::tag('span', $sectionnavlinks['previous'], array('class' => 'mdl-left'));
        $sectionbottomnav .= html_writer::tag('span', $sectionnavlinks['next'], array('class' => 'mdl-right'));
        $sectionbottomnav .= html_writer::tag('div', $this->section_nav_selection($course, $sections, $displaysection),
            array('class' => 'mdl-align'));
        $sectionbottomnav .= html_writer::end_tag('div');
        echo $sectionbottomnav;

        // Close single-section div.
        echo html_writer::end_tag('div');
    }

    /**
     * Generate next/previous section links for naviation
     *
     * @param stdClass $course The course entry from DB
     * @param array $sections The course_sections entries from the DB
     * @param int $sectionno The section number in the coruse which is being dsiplayed
     * @return array associative array with previous and next section link
     */
    protected function get_nav_links($course, $sections, $sectionno) {
        // FIXME: This is really evil and should by using the navigation API.
        $course = course_get_format($course)->get_course();
        $canviewhidden = has_capability('moodle/course:viewhiddensections', context_course::instance($course->id))
            or !$course->hiddensections;

        $arrowleft = 'left';
        $arrowright = 'right';

        // RTL support.
        if (right_to_left()) {
            $arrowleft = 'right';
            $arrowright = 'left';
        }

        $links = array('previous' => '', 'next' => '');
        $back = $sectionno - 1;
        while ($back > 0 and empty($links['previous'])) {
            if ($canviewhidden || $sections[$back]->uservisible) {
                $params = array();
                if (!$sections[$back]->visible) {
                    $params = array('class' => 'dimmed_text');
                }
                $previouslink = html_writer::tag('span', '<i class="icon-arrow-'.$arrowleft.'"></i>', array('class' => 'larrow'));
                $previouslink .= "<span class='text'><span class='nav_guide'>".get_string('prev_section', 'theme_moove')."</span>";
                $previouslink .= "<br>" . get_section_name($course, $sections[$back])."</span>";
                $links['previous'] = html_writer::link(course_get_url($course, $back), $previouslink, $params);
            }
            $back--;
        }

        $forward = $sectionno + 1;
        $numsections = course_get_format($course)->get_last_section_number();
        while ($forward <= $numsections and empty($links['next'])) {
            if ($canviewhidden || $sections[$forward]->uservisible) {
                $params = array();
                if (!$sections[$forward]->visible) {
                    $params = array('class' => 'dimmed_text');
                }
                $nextlink = "<span class='text'><span class='nav_guide'>".get_string('next_section', 'theme_moove')."</span><br>";
                $nextlink .= get_section_name($course, $sections[$forward])."</span>";
                $nextlink .= html_writer::tag('span', '<i class="icon-arrow-'.$arrowright.'"></i>', array('class' => 'rarrow'));
                $links['next'] = html_writer::link(course_get_url($course, $forward), $nextlink, $params);
            }
            $forward++;
        }

        return $links;
    }

    /**
     * Output the html for a multiple section page
     *
     * @param stdClass $course The course entry from DB
     * @param array $sections (argument not used)
     * @param array $mods (argument not used)
     * @param array $modnames (argument not used)
     * @param array $modnamesused (argument not used)
     */
    public function print_multiple_section_page($course, $sections, $mods, $modnames, $modnamesused) {
        $modinfo = get_fast_modinfo($course);
        $course = course_get_format($course)->get_course();

        $context = context_course::instance($course->id);
        // Title with completion help icon.
        $completioninfo = new completion_info($course);
        echo $completioninfo->display_help_icon();
        echo $this->output->heading($this->page_title(), 2, 'accesshide');

        // Copy activity clipboard..
        echo $this->course_activity_clipboard($course, 0);

        // Now the list of sections..
        echo $this->start_section_list();
        $numsections = course_get_format($course)->get_last_section_number();

        $hasrow = false;
        foreach ($modinfo->get_section_info_all() as $section => $thissection) {
            if ($section == 0) {
                // 0-section is displayed a little different then the others.
                if ($thissection->summary or !empty($modinfo->sections[0]) or $this->page->user_is_editing()) {
                    echo $this->section_header($thissection, $course, false, 0);
                    echo $this->courserenderer->course_section_cm_list($course, $thissection, 0);
                    echo $this->courserenderer->course_section_add_cm_control($course, 0, 0);
                    echo $this->section_footer();
                }
                continue;
            }
            if ($section > $numsections) {
                // Activities inside this section are 'orphaned', this section will be printed as 'stealth' below.
                continue;
            }

            if (!$hasrow && $course->coursedisplay) {
                // Initialize or reinitialize a new row to print the course sections boxes.
                echo "<div class='row'>";

                $hasrow = true;
            }

            // Show the section if the user is permitted to access it, OR if it's not available
            // but there is some available info text which explains the reason & should display.
            $showsection = $thissection->uservisible ||
                    ($thissection->visible && !$thissection->available &&
                    !empty($thissection->availableinfo));
            if (!$showsection) {
                // If the hiddensections option is set to 'show hidden sections in collapsed
                // form', then display the hidden section message - UNLESS the section is
                // hidden by the availability system, which is set to hide the reason.
                if (!$course->hiddensections && $thissection->available) {
                    echo $this->section_hidden($section, $course->id);
                }

                continue;
            }

            if (!$this->page->user_is_editing() && $course->coursedisplay == COURSE_DISPLAY_MULTIPAGE) {
                // Display section summary only.
                echo $this->section_summary($thissection, $course, null);
            } else {
                echo $this->section_header($thissection, $course, false, 0);
                if ($thissection->uservisible) {
                    echo $this->courserenderer->course_section_cm_list($course, $thissection, 0);
                    echo $this->courserenderer->course_section_add_cm_control($course, $section, 0);
                }
                echo $this->section_footer();
            }

            if (!($section % 2) && $course->coursedisplay) {
                // There are at least 3 columns. So it's time to create a new row.
                $hasrow = false;

                echo "</div>";
            }
        }

        if ($hasrow && $course->coursedisplay) {
            // We need to close the opened row.
            echo "</div>";
        }

        if ($this->page->user_is_editing() and has_capability('moodle/course:update', $context)) {
            // Print stealth sections if present.
            foreach ($modinfo->get_section_info_all() as $section => $thissection) {
                if ($section <= $numsections or empty($modinfo->sections[$section])) {
                    // This is not stealth section or it is empty.
                    continue;
                }
                echo $this->stealth_section_header($section);
                echo $this->courserenderer->course_section_cm_list($course, $thissection, 0);
                echo $this->stealth_section_footer();
            }

            echo $this->end_section_list();

            echo $this->change_number_sections($course, 0);
        } else {
            echo $this->end_section_list();
        }

    }

    /**
     * Generate a summary of a section for display on the 'coruse index page'
     *
     * @param stdClass $section The course_section entry from DB
     * @param stdClass $course The course entry from DB
     * @param array    $mods (argument not used)
     * @return string HTML to output.
     */
    protected function section_summary($section, $course, $mods) {
        $classattr = 'section main section-summary clearfix col-md-6 col-xs-12';
        $linkclasses = '';

        // If section is hidden then display grey section link.
        if (!$section->visible) {
            $classattr .= ' hidden';
            $linkclasses .= ' dimmed_text';
        } else if (course_get_format($course)->is_section_current($section)) {
            $classattr .= ' current';
        }

        $title = get_section_name($course, $section);
        $output = '';
        $output .= html_writer::start_tag('li', array('id' => 'section-'.$section->section,
            'class' => $classattr, 'role' => 'region', 'aria-label' => $title));

        $output .= html_writer::start_tag('div', array('class' => 'card card-block'));

        $output .= html_writer::tag('div', '<i class="fa fa-laptop"></i>', array('class' => 'pgr-img'));

        $output .= html_writer::start_tag('div', array('class' => 'pgr-content'));
        $output .= html_writer::tag('div', '', array('class' => 'left side'));
        $output .= html_writer::tag('div', '', array('class' => 'right side'));
        $output .= html_writer::start_tag('div', array('class' => 'content'));

        if ($section->uservisible) {
            $title = html_writer::tag('a', $title,
                array('href' => course_get_url($course, $section->section), 'class' => $linkclasses));
        }

        $output .= $this->output->heading($title, 4, 'section-title');

        $output .= html_writer::start_tag('div', array('class' => 'summarytext'));
        $output .= $this->format_summary_text($section);
        $output .= html_writer::end_tag('div');
        $output .= $this->section_activity_summary($section, $course, null);

        $context = context_course::instance($course->id);
        $output .= $this->section_availability_message($section,
            has_capability('moodle/course:viewhiddensections', $context));

        $output .= html_writer::end_tag('div'); // Content.
        $output .= html_writer::end_tag('div'); // Col-md-9.
        $output .= html_writer::end_tag('div'); // Pgr-content.
        $output .= html_writer::end_tag('li');

        return $output;
    }

    /**
     * Generate a summary of the activites in a section
     *
     * @param stdClass $section The course_section entry from DB
     * @param stdClass $course the course record from DB
     * @param array    $mods (argument not used)
     * @return string HTML to output.
     */
    protected function section_activity_summary($section, $course, $mods) {
        $modinfo = get_fast_modinfo($course);
        if (empty($modinfo->sections[$section->section])) {
            return '';
        }

        // Generate array with count of activities in this section.
        $sectionmods = array();
        $total = 0;
        $complete = 0;
        $cancomplete = isloggedin() && !isguestuser();
        $completioninfo = new completion_info($course);
        foreach ($modinfo->sections[$section->section] as $cmid) {
            $thismod = $modinfo->cms[$cmid];

            if ($thismod->uservisible) {
                if (isset($sectionmods[$thismod->modname])) {
                    $sectionmods[$thismod->modname]['name'] = $thismod->modplural;
                    $sectionmods[$thismod->modname]['count']++;
                } else {
                    $sectionmods[$thismod->modname]['name'] = $thismod->modfullname;
                    $sectionmods[$thismod->modname]['count'] = 1;
                }
                if ($cancomplete && $completioninfo->is_enabled($thismod) != COMPLETION_TRACKING_NONE) {
                    $total++;
                    $completiondata = $completioninfo->get_data($thismod, true);
                    if ($completiondata->completionstate == COMPLETION_COMPLETE ||
                            $completiondata->completionstate == COMPLETION_COMPLETE_PASS) {
                        $complete++;
                    }
                }
            }
        }

        if (empty($sectionmods)) {
            // No sections.
            return '';
        }

        // Output section completion data.
        $output = '';
        if ($total > 0) {
            $completion = new stdClass;
            $completion->complete = $complete;
            $completion->total = $total;

            $percent = 0;
            if ($complete > 0) {
                $percent = (int) (($complete / $total) * 100);
            }

            $output = html_writer::start_tag('div', array('class' => 'section-summary-activities'));
            $output .= html_writer::tag(
                'span',
                get_string('discipline_progress', 'theme_moove'),
                array('class' => 'activity-count')
            );
            $output .= "<div class='progress'>";
            $output .= "<div class='progress-bar progress-bar-info' role='progressbar' aria-valuenow='{$percent}' ";
            $output .= " aria-valuemin='0' aria-valuemax='100' style='width: {$percent}%;'>";
            $output .= "{$percent}%";
            $output .= "</div>";
            $output .= "</div>";
            $output .= html_writer::end_tag('div');
        }

        return $output;
    }
}