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<?php
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// This file is part of Book 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/>.

/**
 * Book view page
 *
 * @package    mod
 * @subpackage book
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 * @copyright  2004-2011 Petr Skoda  {@link http://skodak.org}
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
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require('../../config.php');
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require_once($CFG->dirroot.'/mod/book/locallib.php');
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$id        = optional_param('id', 0, PARAM_INT);        // Course Module ID
$bid       = optional_param('b', 0, PARAM_INT);         // Book id
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$chapterid = optional_param('chapterid', 0, PARAM_INT); // Chapter ID
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$edit      = optional_param('edit', -1, PARAM_BOOL);    // Edit mode
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// =========================================================================
// security checks START - teachers edit; students view
// =========================================================================
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if ($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);
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    $cm = get_coursemodule_from_instance('book', $book->id, 0, false, MUST_EXIST);
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    $course = $DB->get_record('course', array('id'=>$cm->course), '*', MUST_EXIST);
    $id = $cm->id;
}
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require_course_login($course, true, $cm);

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

$allowedit   = has_capability('mod/book:edit', $context);
$viewhidden  = has_capability('mod/book:viewhiddenchapters', $context);
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if ($allowedit) {
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    if ($edit != -1 and confirm_sesskey()) {
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        $USER->editing = $edit;
    } else {
        if (isset($USER->editing)) {
            $edit = $USER->editing;
        } else {
            $edit = 0;
        }
    }
} else {
    $edit = 0;
}

/// read chapters
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$select = $viewhidden ? array('bookid' => $book->id) : array('bookid' => $book->id, 'hidden' => 0);
$chapters = $DB->get_records('book_chapters', $select, 'pagenum', 'id, pagenum, subchapter, title, hidden');
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if (!$chapters) {
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    if ($allowedit) {
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        redirect('edit.php?cmid='.$cm->id); //no chapters - add new one
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        die;
    } else {
        error('Error reading book chapters.');
    }
}
/// check chapterid and read chapter data
if ($chapterid == '0') { // go to first chapter if no given
    foreach($chapters as $ch) {
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        if ($allowedit) {
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            $chapterid = $ch->id;
            break;
        }
        if (!$ch->hidden) {
            $chapterid = $ch->id;
            break;
        }
    }
}

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$chapter = $DB->get_record('book_chapters', array('id'=>$chapterid, 'bookid'=>$book->id), '*', MUST_EXIST);

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$PAGE->set_url('/mod/book/view.php', array('id'=>$id, 'chapterid'=>$chapterid));
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//check all variables
unset($id);
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unset($bid);
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unset($chapterid);

/// chapter is hidden for students
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if (!$viewhidden and $chapter->hidden) {
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    error('Error reading book chapters.');
}

// =========================================================================
// security checks  END
// =========================================================================

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add_to_log($course->id, 'book', 'view', 'view.php?id='.$cm->id.'&amp;chapterid='.$chapter->id, $book->id, $cm->id);
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///read standard strings
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$strbooks = get_string('modulenameplural', 'mod_book');
$strbook  = get_string('modulename', 'mod_book');
$strtoc   = get_string('toc', 'mod_book');
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/// prepare header
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$PAGE->set_title(format_string($book->name));
$PAGE->add_body_class('mod_book');
$PAGE->set_heading(format_string($course->fullname));
echo $OUTPUT->header();
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/// prepare chapter navigation icons
$previd = null;
$nextid = null;
$found = 0;
foreach ($chapters as $ch) {
    if ($found) {
        $nextid= $ch->id;
        break;
    }
    if ($ch->id == $chapter->id) {
        $found = 1;
    }
    if (!$found) {
        $previd = $ch->id;
    }
}
if ($ch == current($chapters)) {
    $nextid = $ch->id;
}
$chnavigation = '';
if ($previd) {
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    $chnavigation .= '<a title="'.get_string('navprev', 'book').'" href="view.php?id='.$cm->id.'&amp;chapterid='.$previd.'"><img src="'.$OUTPUT->pix_url('nav_prev', 'mod_book').'" class="bigicon" alt="'.get_string('navprev', 'book').'"/></a>';
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} else {
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    $chnavigation .= '<img src="pix/nav_prev_dis.gif" class="bigicon" alt="" />';
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}
if ($nextid) {
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    $chnavigation .= '<a title="'.get_string('navnext', 'book').'" href="view.php?id='.$cm->id.'&amp;chapterid='.$nextid.'"><img src="'.$OUTPUT->pix_url('nav_next', 'mod_book').'" class="bigicon" alt="'.get_string('navnext', 'book').'" /></a>';
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} else {
    $sec = '';
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    if ($section = $DB->get_record('course_sections', array('id'=>$cm->section))) {
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        $sec = $section->section;
    }
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    $chnavigation .= '<a title="'.get_string('navexit', 'book').'" href="../../course/view.php?id='.$course->id.'#section-'.$sec.'"><img src="'.$OUTPUT->pix_url('nav_exit', 'mod_book').'" class="bigicon" alt="'.get_string('navexit', 'book').'" /></a>';
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}

// prepare $toc and $currtitle, $currsubtitle
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list($toc, $currtitle, $currsubtitle, $titles) = book_get_toc($chapters, $chapter, $book, $cm, $edit, 0);
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if ($edit) {
    $tocwidth = $CFG->book_tocwidth + 80;
} else {
    $tocwidth = $CFG->book_tocwidth;
}

// =====================================================
// Book display HTML code
// =====================================================

?>
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<table class="booktable" width="100%" cellspacing="0" cellpadding="2">
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<!-- subchapter title and upper navigation row //-->
<tr>
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    <td style="width:<?php echo $tocwidth ?>px" valign="bottom">
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        <?php
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        print_string('toc', 'mod_book');
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        ?>
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    </td>
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    <td>
        <div class="booknav"><?php echo $chnavigation ?></div>
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    </td>
</tr>

<!-- toc and chapter row //-->
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<tr class="tocandchapter" valign="top">
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    <td style="width:<?php echo $tocwidth ?>px" align="left"><div class="clearer">&nbsp;</div>
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        <?php
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        echo $OUTPUT->box_start('generalbox');
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        echo $toc;
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        echo $OUTPUT->box_end();
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        if ($allowedit and $edit) {
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            echo '<div class="faq">';
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            echo $OUTPUT->help_icon('faq', 'mod_book', get_string('faq', 'mod_book'));
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            echo '</div>';
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        }
        ?>
    </td>
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    <td align="right" valign="top"><div class="clearer">&nbsp;</div>
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        <?php
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        echo $OUTPUT->box_start('generalbox');
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        echo '<div class="book_content">';
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        if (!$book->customtitles) {
          if ($currsubtitle == '&nbsp;') {
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              echo '<p class="book_chapter_title">'.$currtitle.'</p>';
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          } else {
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              echo '<p class="book_chapter_title">'.$currtitle.'<br />'.$currsubtitle.'</p>';
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          }
        }
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        $chaptertext = file_rewrite_pluginfile_urls($chapter->content, 'pluginfile.php', $context->id, 'mod_book', 'chapter', $chapter->id);
        echo format_text($chaptertext, $chapter->contentformat, array('noclean'=>true, 'context'=>$context));
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        echo '</div>';
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        echo $OUTPUT->box_end();
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        /// lower navigation
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        echo '<div class="booknav">'.$chnavigation.'</div>';
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        ?>
    </td>
</tr>
</table>

<?php
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echo $OUTPUT->footer();
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