/**
 * Prints the discussion view screen for a forum.
 *
 * @global object
 * @global object
 * @param object $course The current course object.
 * @param object $forum Forum to be printed.
 * @param int $maxdiscussions .
 * @param string $displayformat The display format to use (optional).
 * @param string $sort Sort arguments for database query (optional).
 * @param int $groupmode Group mode of the forum (optional).
 * @param void $unused (originally current group)
 * @param int $page Page mode, page to display (optional).
 * @param int $perpage The maximum number of discussions per page(optional)
 *
 */
function forum_print_latest_discussions($course, $forum, $maxdiscussions=-1, $displayformat='plain', $sort='',
                                        $currentgroup=-1, $groupmode=-1, $page=-1, $perpage=100, $cm=NULL) {
    global $CFG, $USER, $OUTPUT;

    if (!$cm) {
        if (!$cm = get_coursemodule_from_instance('forum', $forum->id, $forum->course)) {
            print_error('invalidcoursemodule');
        }
    }
    $context = context_module::instance($cm->id);

    if (empty($sort)) {
        $sort = "d.timemodified DESC";
    }

    $olddiscussionlink = false;

 // Sort out some defaults
    if ($perpage <= 0) {
        $perpage = 0;
        $page    = -1;
    }

    if ($maxdiscussions == 0) {
        // all discussions - backwards compatibility
        $page    = -1;
        $perpage = 0;
        if ($displayformat == 'plain') {
            $displayformat = 'header';  // Abbreviate display by default
        }

    } else if ($maxdiscussions > 0) {
        $page    = -1;
        $perpage = $maxdiscussions;
    }

    $fullpost = false;
    if ($displayformat == 'plain') {
        $fullpost = true;
    }


// Decide if current user is allowed to see ALL the current discussions or not

// First check the group stuff
    if ($currentgroup == -1 or $groupmode == -1) {
        $groupmode    = groups_get_activity_groupmode($cm, $course);
        $currentgroup = groups_get_activity_group($cm);
    }

    $groups = array(); //cache

// If the user can post discussions, then this is a good place to put the
// button for it. We do not show the button if we are showing site news
// and the current user is a guest.

    $canstart = forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context);
    if (!$canstart and $forum->type !== 'news') {
        if (isguestuser() or !isloggedin()) {
            $canstart = true;
        }
        if (!is_enrolled($context) and !is_viewing($context)) {
            // allow guests and not-logged-in to see the button - they are prompted to log in after clicking the link
            // normal users with temporary guest access see this button too, they are asked to enrol instead
            // do not show the button to users with suspended enrolments here
            $canstart = enrol_selfenrol_available($course->id);
        }
    }

    if ($canstart) {
        echo '<div class="singlebutton forumaddnew">';
        echo "<form id=\"newdiscussionform\" method=\"get\" action=\"$CFG->wwwroot/mod/forum/post.php\">";
        echo '<div>';
        echo "<input type=\"hidden\" name=\"forum\" value=\"$forum->id\" />";
        switch ($forum->type) {
            case 'news':
            case 'blog':
                $buttonadd = get_string('addanewtopic', 'forum');
                break;
            case 'qanda':
                $buttonadd = get_string('addanewquestion', 'forum');
                break;
            default:
                $buttonadd = get_string('addanewdiscussion', 'forum');
//.........这里部分代码省略.........

if (!empty($forum)) {
    // User is starting a new discussion in a forum
    if (!($forum = $DB->get_record("forum", array("id" => $forum)))) {
        print_error('invalidforumid', 'forum');
    }
    if (!($course = $DB->get_record("course", array("id" => $forum->course)))) {
        print_error('invalidcourseid');
    }
    if (!($cm = get_coursemodule_from_instance("forum", $forum->id, $course->id))) {
        print_error("invalidcoursemodule");
    }
    $coursecontext = get_context_instance(CONTEXT_COURSE, $course->id);
    if (!forum_user_can_post_discussion($forum, $groupid, -1, $cm)) {
        if (!isguestuser()) {
            if (!is_enrolled($coursecontext)) {
                if (enrol_selfenrol_available($course->id)) {
                    $SESSION->wantsurl = $FULLME;
                    $SESSION->enrolcancel = $_SERVER['HTTP_REFERER'];
                    redirect($CFG->wwwroot . '/enrol/index.php?id=' . $course->id, get_string('youneedtoenrol'));
                }
            }
        }
        print_error('nopostforum', 'forum');
    }
    if (!$cm->visible and !has_capability('moodle/course:viewhiddenactivities', $coursecontext)) {
        print_error("activityiscurrentlyhidden");
    }
    if (isset($_SERVER["HTTP_REFERER"])) {
        $SESSION->fromurl = $_SERVER["HTTP_REFERER"];
    } else {
        $SESSION->fromurl = '';

$PAGE->set_heading($course->fullname);
$PAGE->set_button($searchform);
echo $OUTPUT->header();
echo $OUTPUT->heading(format_string($forum->name), 2);
/// Check to see if groups are being used in this forum
/// If so, make sure the current person is allowed to see this discussion
/// Also, if we know they should be able to reply, then explicitly set $canreply for performance reasons
$canreply = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
if (!$canreply and $forum->type !== 'news') {
    if (isguestuser() or !isloggedin()) {
        $canreply = true;
    }
    if (!is_enrolled($modcontext) and !is_viewing($modcontext)) {
        // allow guests and not-logged-in to see the link - they are prompted to log in after clicking the link
        // normal users with temporary guest access see this link too, they are asked to enrol instead
        $canreply = enrol_selfenrol_available($course->id);
    }
}
/// Print the controls across the top
echo '<div class="discussioncontrols clearfix">';
if (!empty($CFG->enableportfolios) && has_capability('mod/forum:exportdiscussion', $modcontext)) {
    require_once $CFG->libdir . '/portfoliolib.php';
    $button = new portfolio_add_button();
    $button->set_callback_options('forum_portfolio_caller', array('discussionid' => $discussion->id), 'mod_forum');
    $button = $button->to_html(PORTFOLIO_ADD_FULL_FORM, get_string('exportdiscussion', 'mod_forum'));
    $buttonextraclass = '';
    if (empty($button)) {
        // no portfolio plugin available.
        $button = '&nbsp;';
        $buttonextraclass = ' noavailable';
    }

/**
 * Prints the discussion view screen for a forum.
 *
 * @global object
 * @global object
 * @param object $course The current course object.
 * @param object $forum Forum to be printed.
 * @param int $maxdiscussions .
 * @param string $sort Sort arguments for database query (optional).
 * @param int $groupmode Group mode of the forum (optional).
 * @param void $unused (originally current group)
 * @param int $page Page mode, page to display (optional).
 * @param int $perpage The maximum number of discussions per page(optional)
 *
 */
function hsuforum_print_latest_discussions($course, $forum, $maxdiscussions = -1, $sort = '', $currentgroup = -1, $groupmode = -1, $page = -1, $perpage = 100, $cm = NULL)
{
    global $CFG, $USER, $OUTPUT, $PAGE;
    require_once $CFG->dirroot . '/rating/lib.php';
    if (!$cm) {
        if (!($cm = get_coursemodule_from_instance('hsuforum', $forum->id, $forum->course))) {
            print_error('invalidcoursemodule');
        }
    }
    $context = context_module::instance($cm->id);
    if (empty($sort)) {
        $sort = "d.timemodified DESC";
    }
    $olddiscussionlink = false;
    // Sort out some defaults
    if ($perpage <= 0) {
        $perpage = 0;
        $page = -1;
    }
    if ($maxdiscussions == 0) {
        // all discussions - backwards compatibility
        $page = -1;
        $perpage = 0;
    } else {
        if ($maxdiscussions > 0) {
            $page = -1;
            $perpage = $maxdiscussions;
        }
    }
    $renderer = $PAGE->get_renderer('mod_hsuforum');
    $PAGE->requires->js_init_call('M.mod_hsuforum.init', null, false, $renderer->get_js_module());
    $fullpost = true;
    // Decide if current user is allowed to see ALL the current discussions or not
    // First check the group stuff
    if ($currentgroup == -1 or $groupmode == -1) {
        $groupmode = groups_get_activity_groupmode($cm, $course);
        $currentgroup = groups_get_activity_group($cm);
    }
    $groups = array();
    //cache
    // If the user can post discussions, then this is a good place to put the
    // button for it. We do not show the button if we are showing site news
    // and the current user is a guest.
    $canstart = hsuforum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context);
    if (!$canstart and $forum->type !== 'news') {
        if (isguestuser() or !isloggedin()) {
            $canstart = true;
        }
        if (!is_enrolled($context) and !is_viewing($context)) {
            // allow guests and not-logged-in to see the button - they are prompted to log in after clicking the link
            // normal users with temporary guest access see this button too, they are asked to enrol instead
            // do not show the button to users with suspended enrolments here
            $canstart = enrol_selfenrol_available($course->id);
        }
    }
    // Get all the recent discussions we're allowed to see
    $getuserlastmodified = true;
    $discussions = hsuforum_get_discussions($cm, $sort, $fullpost, $maxdiscussions, $getuserlastmodified, $page, $perpage, false);
    // If we want paging
    $numdiscussions = null;
    if ($page != -1) {
        // Get the number of discussions found.
        $numdiscussions = hsuforum_get_discussions_count($cm);
    } else {
        if ($maxdiscussions > 0 and $maxdiscussions <= count($discussions)) {
            $olddiscussionlink = true;
        }
    }
    // TODO - Can we just delete this first if?
    if (!$canstart && (isguestuser() or !isloggedin() or $forum->type == 'news' or $forum->type == 'qanda' and !has_capability('mod/hsuforum:addquestion', $context) or $forum->type != 'qanda' and !has_capability('mod/hsuforum:startdiscussion', $context))) {
        // no button and no info
    } else {
        if (!$canstart && $groupmode and !has_capability('moodle/site:accessallgroups', $context)) {
            // inform users why they can not post new discussion
            if (!$currentgroup) {
                echo $OUTPUT->notification(get_string('cannotadddiscussionall', 'hsuforum'), 'notifyproblem hsuforum-cannot-post');
            } else {
                if (!groups_is_member($currentgroup)) {
                    echo $OUTPUT->notification(get_string('cannotadddiscussion', 'hsuforum'), 'notifyproblem hsuforum-cannot-post');
                }
            }
        }
    }
    if ($discussions) {
        echo "<h3 class='hsuforum-discussion-count' data-count='{$numdiscussions}'>" . get_string('xdiscussions', 'hsuforum', $numdiscussions) . "</h3>";
//.........这里部分代码省略.........