<?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/>.

/**
 * Book view page
 *
 * @package    mod_book
 * @copyright  2004-2011 Petr Skoda {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require(__DIR__.'/../../config.php');
require_once(__DIR__.'/lib.php');
require_once(__DIR__.'/locallib.php');
require_once($CFG->libdir.'/completionlib.php');

$id        = optional_param('id', 0, PARAM_INT);        // Course Module ID
$bid       = optional_param('b', 0, PARAM_INT);         // Book id
$chapterid = optional_param('chapterid', 0, PARAM_INT); // Chapter ID
$edit      = optional_param('edit', -1, PARAM_BOOL);    // Edit mode

// =========================================================================
// security checks START - teachers edit; students view
// =========================================================================
if ($id) {
    $cm = get_coursemodule_from_id('book', $id, 0, false, MUST_EXIST);
    $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
    $book = $DB->get_record('book', array('id'=>$cm->instance), '*', MUST_EXIST);
} else {
    $book = $DB->get_record('book', array('id'=>$bid), '*', MUST_EXIST);
    $cm = get_coursemodule_from_instance('book', $book->id, 0, false, MUST_EXIST);
    $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
    $id = $cm->id;
}

require_course_login($course, true, $cm);

$context = context_module::instance($cm->id);
require_capability('mod/book:read', $context);

$allowedit  = has_capability('mod/book:edit', $context);
$viewhidden = has_capability('mod/book:viewhiddenchapters', $context);

if ($allowedit) {
    if ($edit != -1 and confirm_sesskey()) {
        $USER->editing = $edit;
    } else {
        if (isset($USER->editing)) {
            $edit = $USER->editing;
        } else {
            $edit = 0;
        }
    }
} else {
    $edit = 0;
}

// read chapters
$chapters = book_preload_chapters($book);

if ($allowedit and !$chapters) {
    redirect('edit.php?cmid='.$cm->id); // No chapters - add new one.
}
// Check chapterid and read chapter data
if ($chapterid == '0') { // Go to first chapter if no given.
    // Trigger course module viewed event.
    book_view($book, null, false, $course, $cm, $context);

    foreach ($chapters as $ch) {
        if ($edit || ($ch->hidden && $viewhidden)) {
            $chapterid = $ch->id;
            break;
        }
        if (!$ch->hidden) {
            $chapterid = $ch->id;
            break;
        }
    }
}


< $courseurl = new moodle_url('/course/view.php', array('id' => $course->id));
< 
< // No content in the book.
< if (!$chapterid) {
<     $PAGE->set_url('/mod/book/view.php', array('id' => $id));
<     notice(get_string('nocontent', 'mod_book'), $courseurl->out(false));
< }
< // Chapter doesnt exist or it is hidden for students
< if ((!$chapter = $DB->get_record('book_chapters', array('id' => $chapterid, 'bookid' => $book->id))) or ($chapter->hidden and !$viewhidden)) {
<     print_error('errorchapter', 'mod_book', $courseurl);



> // Prepare header.
> $pagetitle = $book->name;
> if ($chapter = $DB->get_record('book_chapters', ['id' => $chapterid, 'bookid' => $book->id])) {
>     $pagetitle .= ": {$chapter->title}";


}


< $PAGE->set_url('/mod/book/view.php', array('id'=>$id, 'chapterid'=>$chapterid));
< 
< 
< // Unset all page parameters.
< unset($id);
< unset($bid);
< unset($chapterid);
< 
< // Read standard strings.
< $strbooks = get_string('modulenameplural', 'mod_book');
< $strbook  = get_string('modulename', 'mod_book');
< $strtoc   = get_string('toc', 'mod_book');
< 
< // prepare header
< $pagetitle = $book->name . ": " . $chapter->title;



> $PAGE->set_other_editing_capability('mod/book:edit');


$PAGE->set_title($pagetitle);
$PAGE->set_heading($course->fullname);

> $PAGE->add_body_class('limitedwidth');




< book_add_fake_block($chapters, $chapter, $book, $cm, $edit);
< 
< // prepare chapter navigation icons
< $previd = null;
< $prevtitle = null;
< $navprevtitle = null;
< $nextid = null;
< $nexttitle = null;
< $navnexttitle = null;
< $last = null;
< foreach ($chapters as $ch) {
<     if (!$edit and ($ch->hidden && !$viewhidden)) {
<         continue;
<     }
<     if ($last == $chapter->id) {
<         $nextid = $ch->id;
<         $nexttitle = book_get_chapter_title($ch->id, $chapters, $book, $context);
<         $navnexttitle = get_string('navnexttitle', 'mod_book', $nexttitle);
<         break;
<     }
<     if ($ch->id != $chapter->id) {
<         $previd = $ch->id;
<         $prevtitle = book_get_chapter_title($ch->id, $chapters, $book, $context);
<         $navprevtitle = get_string('navprevtitle', 'mod_book', $prevtitle);
<     }
<     $last = $ch->id;
< }
< 
< if ($book->navstyle) {
<     $navprevicon = right_to_left() ? 'nav_next' : 'nav_prev';
<     $navnexticon = right_to_left() ? 'nav_prev' : 'nav_next';
< 
<     $chnavigation = '';
<     if ($previd) {
<         $navprev = get_string('navprev', 'book');
<         if ($book->navstyle == 1) {
<             $chnavigation .= '<a title="' . $navprevtitle . '" class="bookprev" href="view.php?id=' .
<                 $cm->id . '&amp;chapterid=' . $previd .  '">' .
<                 $OUTPUT->pix_icon($navprevicon, $navprevtitle, 'mod_book') . '</a>';
<         } else {
<             $chnavigation .= '<a title="' . $navprev . '" class="bookprev" href="view.php?id=' .
<                 $cm->id . '&amp;chapterid=' . $previd . '">' .
<                 '<span class="chaptername"><span class="arrow">' . $OUTPUT->larrow() . '&nbsp;</span></span>' .
<                 $navprev . ':&nbsp;<span class="chaptername">' . $prevtitle . '</span></a>';
<         }
<     }
<     if ($nextid) {
<         $navnext = get_string('navnext', 'book');
<         if ($book->navstyle == 1) {
<             $chnavigation .= '<a title="' . $navnexttitle . '" class="booknext" href="view.php?id=' .
<                 $cm->id . '&amp;chapterid='.$nextid.'">' .
<                 $OUTPUT->pix_icon($navnexticon, $navnexttitle, 'mod_book') . '</a>';
<         } else {
<             $chnavigation .= ' <a title="' . $navnext . '" class="booknext" href="view.php?id=' .
<                 $cm->id . '&amp;chapterid='.$nextid.'">' .
<                 $navnext . ':<span class="chaptername">&nbsp;' . $nexttitle.
<                 '<span class="arrow">&nbsp;' . $OUTPUT->rarrow() . '</span></span></a>';
<         }
<     } else {
<         $navexit = get_string('navexit', 'book');
<         $sec = $DB->get_field('course_sections', 'section', array('id' => $cm->section));
<         $returnurl = course_get_url($course, $sec);
<         if ($book->navstyle == 1) {
<             $chnavigation .= '<a title="' . $navexit . '" class="bookexit"  href="'.$returnurl.'">' .
<                 $OUTPUT->pix_icon('nav_exit', $navexit, 'mod_book') . '</a>';



> // No content in the book.
> if (!$chapterid) {
>     $PAGE->set_url('/mod/book/view.php', array('id' => $id));
>     echo $OUTPUT->header();
>     echo $OUTPUT->notification(get_string('nocontent', 'mod_book'), 'info', false);


        } else {

<             $chnavigation .= ' <a title="' . $navexit . '" class="bookexit"  href="'.$returnurl.'">' .
<                 '<span class="chaptername">' . $navexit . '&nbsp;' . $OUTPUT->uarrow() . '</span></a>';
<         }



>     $PAGE->set_url('/mod/book/view.php', ['id' => $id, 'chapterid' => $chapterid]);
>     // The chapter doesnt exist or it is hidden for students.
>     if (!$chapter or ($chapter->hidden and !$viewhidden)) {
>         $courseurl = new moodle_url('/course/view.php', ['id' => $course->id]);
>         throw new moodle_exception('errorchapter', 'mod_book', $courseurl);


    }

< }
< 
< // We need to discover if this is the last chapter to mark activity as completed.
< $islastchapter = false;
< if (!$nextid) {
<     $islastchapter = true;
< }
< 
< book_view($book, $chapter, $islastchapter, $course, $cm, $context);
< 
< // =====================================================
< // Book display HTML code
< // =====================================================



>     // Add the Book TOC block.
>     book_add_fake_block($chapters, $chapter, $book, $cm, $edit);
>     book_view($book, $chapter, \mod_book\helper::is_last_visible_chapter($chapter->id, $chapters), $course, $cm, $context);



echo $OUTPUT->header();

< echo $OUTPUT->heading(format_string($book->name));
< 
< // Info box.
< if ($book->intro) {
<     echo $OUTPUT->box(format_module_intro('book', $book, $cm->id), 'generalbox', 'intro');
< }




< $navclasses = book_get_nav_classes();
< 
< if ($book->navstyle) {
<     // Upper navigation.
<     echo '<div class="navtop border-top py-3 clearfix ' . $navclasses[$book->navstyle] . '">' . $chnavigation . '</div>';
< }



>     $renderer = $PAGE->get_renderer('mod_book');
>     $actionmenu = new \mod_book\output\main_action_menu($cm->id, $chapters, $chapter, $book);
>     $renderedmenu = $renderer->render($actionmenu);
>     echo $renderedmenu;



// The chapter itself.
$hidden = $chapter->hidden ? ' dimmed_text' : null;
echo $OUTPUT->box_start('generalbox book_content' . $hidden);

if (!$book->customtitles) {
    if (!$chapter->subchapter) {
        $currtitle = book_get_chapter_title($chapter->id, $chapters, $book, $context);
        echo $OUTPUT->heading($currtitle, 3);
    } else {
        $currtitle = book_get_chapter_title($chapters[$chapter->id]->parent, $chapters, $book, $context);
        $currsubtitle = book_get_chapter_title($chapter->id, $chapters, $book, $context);
        echo $OUTPUT->heading($currtitle, 3);
        echo $OUTPUT->heading($currsubtitle, 4);
    }
}

< $chaptertext = file_rewrite_pluginfile_urls($chapter->content, 'pluginfile.php', $context->id, 'mod_book', 'chapter', $chapter->id);
< echo format_text($chaptertext, $chapter->contentformat, array('noclean'=>true, 'overflowdiv'=>true, 'context'=>$context));



>     $chaptertext = file_rewrite_pluginfile_urls($chapter->content, 'pluginfile.php', $context->id, 'mod_book',
>         'chapter', $chapter->id);
>     echo format_text($chaptertext, $chapter->contentformat, ['noclean' => true, 'overflowdiv' => true,
>         'context' => $context]);



echo $OUTPUT->box_end();

if (core_tag_tag::is_enabled('mod_book', 'book_chapters')) {
    echo $OUTPUT->tag_list(core_tag_tag::get_item_tags('mod_book', 'book_chapters', $chapter->id), null, 'book-tags');
}

< 
< if ($book->navstyle) {
<     // Lower navigation.
<     echo '<div class="navbottom py-3 border-bottom clearfix ' . $navclasses[$book->navstyle] . '">' . $chnavigation . '</div>';



>     echo $renderedmenu;


}

< 


echo $OUTPUT->footer();