<?PHP // $Id: modules.php,v 1.21.2.2 2006/05/17 16:37:15 tjhunt Exp $
      // Allows the admin to manage activity modules

    require_once('../config.php');
    require_once('../course/lib.php');

    $show    = optional_param('show', '', PARAM_SAFEDIR);
    $hide    = optional_param('hide', '', PARAM_SAFEDIR);
    $delete  = optional_param('delete', '', PARAM_SAFEDIR);
    $confirm = optional_param('confirm', '', PARAM_BOOL);

    require_login();

    if (!isadmin()) {
        error("Only administrators can use this page!");
    }

    if (!$site = get_site()) {
        error("Site isn't defined!");
    }


/// Print headings

    $stradministration = get_string("administration");
    $strconfiguration = get_string("configuration");
    $strmanagemodules = get_string("managemodules");
    $strdelete = get_string("delete");
    $strversion = get_string("version");
    $strhide = get_string("hide");
    $strshow = get_string("show");
    $strsettings = get_string("settings");
    $stractivities = get_string("activities");
    $stractivitymodule = get_string("activitymodule");

    print_header("$site->shortname: $strmanagemodules", "$site->fullname", 
                 "<a href=\"index.php\">$stradministration</a> -> ".
                 "<a href=\"configure.php\">$strconfiguration</a> -> $strmanagemodules");

    print_heading($strmanagemodules);
   
    $coursesaffected = false;
    

/// If data submitted, then process and store.

    if (!empty($hide) and confirm_sesskey()) {
        if (!$module = get_record("modules", "name", $hide)) {
            error("Module doesn't exist!");
        }
        set_field("modules", "visible", "0", "id", $module->id);                               // Hide main module
        set_field('course_modules', 'visibleold', '1', 'visible' ,'1', 'module', $module->id); // Remember the previous visible state so we can toggle this back if the module is unhidden.
        set_field('course_modules', 'visibleold', '0', 'visible' ,'0', 'module', $module->id);
        set_field("course_modules", "visible", "0", "module", $module->id);                    // Hide all related activity modules
        $coursesaffected = true;
    }

    if (!empty($show) and confirm_sesskey()) {
        if (!$module = get_record("modules", "name", $show)) {
            error("Module doesn't exist!");
        }
        set_field("modules", "visible", "1", "id", $module->id);                               // Show main module
        set_field('course_modules', 'visible', '1', 'visibleold', '1', 'module', $module->id); // Get the previous saved visible state for the course module.
        $coursesaffected = true;
    }

    if (!empty($delete) and confirm_sesskey()) {
      
        $strmodulename = get_string("modulename", "$delete");

        if (!$confirm) {
            notice_yesno(get_string("moduledeleteconfirm", "", $strmodulename), 
                         "modules.php?delete=$delete&amp;confirm=1&amp;sesskey=$USER->sesskey", 
                         "modules.php");
            print_footer();
            exit;

        } else {  // Delete everything!!

            if ($delete == "forum") {
                error("You can not delete the forum module!!");
            }

            if (!$module = get_record("modules", "name", $delete)) {
                error("Module doesn't exist!");
            }

            // OK, first delete all the relevant instances from all course sections
            if ($coursemods = get_records("course_modules", "module", $module->id)) {
                foreach ($coursemods as $coursemod) {
                    if (! delete_mod_from_section($coursemod->id, $coursemod->section)) {
                        notify("Could not delete the $strmodulename with id = $coursemod->id from section $coursemod->section");
                    }
                }
            }

            // Now delete all the course module records
            if (!delete_records("course_modules", "module", $module->id)) {
                notify("Error occurred while deleting all $strmodulename records in course_modules table");
            }

            // Then delete all the logs 
            if (!delete_records("log", "module", $module->name)) {
                notify("Error occurred while deleting all $strmodulename records in log table");
            }

            // And log_display information
            if (!delete_records("log_display", "module", $module->name)) {
                notify("Error occurred while deleting all $strmodulename records in log_display table");
            }

            // And the module entry itself
            if (!delete_records("modules", "name", $module->name)) {
                notify("Error occurred while deleting the $strmodulename record from modules table");
            }

            // Then the tables themselves

            if ($tables = $db->Metatables()) {
                $prefix = $CFG->prefix.$module->name;
                foreach ($tables as $table) {
                    if (strpos($table, $prefix) === 0) {
                        if (!execute_sql("DROP TABLE $table", false)) {
                            notify("ERROR: while trying to drop table $table");
                        }
                    }
                }
            }  

            //rebuild_course_cache();  // Because things have changed
            $coursesaffected = true;

            $a->module = $strmodulename;
            $a->directory = "$CFG->dirroot/mod/$delete";
            notice(get_string("moduledeletefiles", "", $a), "modules.php");
        }
    }
    
    if ($coursesaffected) {
        rebuild_course_cache();  // Because things have changed
    }
    

/// Get and sort the existing modules

    if (!$modules = get_records("modules")) {
        error("No modules found!!");        // Should never happen
    }

    foreach ($modules as $module) {
        $strmodulename = get_string("modulename", "$module->name");
        // Deal with modules which are lacking the language string
        if ($strmodulename == '[[modulename]]') {
            $strmodulename = $module->name;
        }
        $modulebyname[$strmodulename] = $module;
    }
    ksort($modulebyname);

/// Print the table of all modules

    $table->head  = array ($stractivitymodule, $stractivities, $strversion, "$strhide/$strshow", $strdelete, $strsettings);
    $table->align = array ("left", "right", "left", "center", "center", "center");
    $table->wrap  = array ("nowrap", "", "", "", "","");
    $table->size  = array ("100%", "10", "10", "10", "10","12");
    $table->width = "100";

    foreach ($modulebyname as $modulename => $module) {

        $icon = "<img src=\"$CFG->modpixpath/$module->name/icon.gif\" hspace=\"10\" height=\"16\" width=\"16\" border=\"0\" alt=\"\" />";

        $delete = "<a href=\"modules.php?delete=$module->name&amp;sesskey=$USER->sesskey\">$strdelete</a>";

        if (file_exists("$CFG->dirroot/mod/$module->name/config.html")) {
            $settings = "<a href=\"module.php?module=$module->name\">$strsettings</a>";
        } else {
            $settings = "";
        }

        $count = count_records("$module->name");

        if ($module->visible) {
            $visible = "<a href=\"modules.php?hide=$module->name&amp;sesskey=$USER->sesskey\" title=\"$strhide\">".
                       "<img src=\"$CFG->pixpath/i/hide.gif\" align=\"middle\" height=\"16\" width=\"16\" border=\"0\" alt=\"\" /></a>";
            $class = "";
        } else {
            $visible = "<a href=\"modules.php?show=$module->name&amp;sesskey=$USER->sesskey\" title=\"$strshow\">".
                       "<img src=\"$CFG->pixpath/i/show.gif\" align=\"middle\" height=\"16\" width=\"16\" border=\"0\" alt=\"\" /></a>";
            $class = "class=\"dimmed_text\"";
        }
        if ($module->name == "forum") {
            $delete = "";
            $visible = "";
            $class = "";
        }
        $table->data[] = array ("<span $class>$icon $modulename</span>", $count, $module->version, $visible, $delete, $settings);
    }
    print_table($table);

    echo "<br /><br />";

    print_footer();

?>
