<?php  // $Id$
       // Contains functions that only administrators will ever need to use

function upgrade_enrol_plugins($return) {
    global $CFG;

    if (!$mods = get_list_of_plugins("enrol") ) {
        error("No modules installed!");
    }

    foreach ($mods as $mod) {

        $fullmod = "$CFG->dirroot/enrol/$mod";

        unset($module);

        if ( is_readable("$fullmod/version.php")) {
            include_once("$fullmod/version.php");  // defines $module with version etc
        } else {
            continue;                              // Nothing to do.
        }

        if ( is_readable("$fullmod/db/$CFG->dbtype.php")) {
            include_once("$fullmod/db/$CFG->dbtype.php");  // defines upgrading function
        } else {
            continue;
        }

        if (!isset($module)) {
            continue;
        }

        if (!empty($module->requires)) {
            if ($module->requires > $CFG->version) {
                $info->modulename = $mod;
                $info->moduleversion  = $module->version;
                $info->currentmoodle = $CFG->version;
                $info->requiremoodle = $module->requires;
                notify(get_string('modulerequirementsnotmet', 'error', $info));
                unset($info);
                continue;
            }
        }

        $module->name = $mod;   // The name MUST match the directory

        $moduleversion = 'enrol_'.$mod.'_version';

        if (!isset($CFG->$moduleversion)) {
            set_config($moduleversion, 0);
        }
        
        if ($CFG->$moduleversion == $module->version) {
            // do nothing
        } else if ($CFG->$moduleversion < $module->version) {
            if (empty($updated_modules)) {
                $strmodulesetup  = get_string("modulesetup");
                print_header($strmodulesetup, $strmodulesetup, $strmodulesetup, "", "", false, "&nbsp;", "&nbsp;");
            }
            print_heading("$module->name module needs upgrading");
            $upgrade_function = $module->name."_upgrade";
            if (function_exists($upgrade_function)) {
                $db->debug=true;
                if ($upgrade_function($currmodule->version)) {
                    $db->debug=false;
                    // OK so far, now update the modules record
                    set_config($moduleversion, $module->version);
                    notify(get_string("modulesuccess", "", $module->name), "green");
                    echo "<hr />";
                } else {
                    $db->debug=false;
                    notify("Upgrading $module->name from $currmodule->version to $module->version FAILED!");
                }
            }
            $updated_modules = true;
        } else {
            error("Version mismatch: $module->name can't downgrade $currmodule->version -> $module->version !");
        }
    }

    if (!empty($updated_modules)) {
        print_continue($return);
        die;
    }
}

function upgrade_activity_modules($return) {
/// Find and check all modules and load them up or upgrade them if necessary

    global $CFG;

    if (!$mods = get_list_of_plugins("mod") ) {
        error("No modules installed!");
    }

    foreach ($mods as $mod) {

        if ($mod == "NEWMODULE") {   // Someone has unzipped the template, ignore it
            continue;
        }

        $fullmod = "$CFG->dirroot/mod/$mod";

        unset($module);

        if ( is_readable("$fullmod/version.php")) {
            include_once("$fullmod/version.php");  # defines $module with version etc
        } else {
            notify("Module $mod: $fullmod/version.php was not readable");
            continue;
        }

        if ( is_readable("$fullmod/db/$CFG->dbtype.php")) {
            include_once("$fullmod/db/$CFG->dbtype.php");  # defines upgrading function
        } else {
            notify("Module $mod: $fullmod/db/$CFG->dbtype.php was not readable");
            continue;
        }

        if (!isset($module)) {
            continue;
        }

        if (!empty($module->requires)) {
            if ($module->requires > $CFG->version) {
                $info->modulename = $mod;
                $info->moduleversion  = $module->version;
                $info->currentmoodle = $CFG->version;
                $info->requiremoodle = $module->requires;
                notify(get_string('modulerequirementsnotmet', 'error', $info));
                unset($info);
                continue;
            }
        }

        $module->name = $mod;   // The name MUST match the directory
        
        if ($currmodule = get_record("modules", "name", $module->name)) {
            if ($currmodule->version == $module->version) {
                // do nothing
            } else if ($currmodule->version < $module->version) {
                if (empty($updated_modules)) {
                    $strmodulesetup  = get_string("modulesetup");
                    print_header($strmodulesetup, $strmodulesetup, $strmodulesetup, "", "", false, "&nbsp;", "&nbsp;");
                }
                print_heading("$module->name module needs upgrading");
                $upgrade_function = $module->name."_upgrade";
                if (function_exists($upgrade_function)) {
                    $db->debug=true;
                    if ($upgrade_function($currmodule->version, $module)) {
                        $db->debug=false;
                        // OK so far, now update the modules record
                        $module->id = $currmodule->id;
                        if (! update_record("modules", $module)) {
                            error("Could not update $module->name record in modules table!");
                        }
                        notify(get_string("modulesuccess", "", $module->name), "green");
                        echo "<hr />";
                    } else {
                        $db->debug=false;
                        notify("Upgrading $module->name from $currmodule->version to $module->version FAILED!");
                    }
                }
                $updated_modules = true;
            } else {
                error("Version mismatch: $module->name can't downgrade $currmodule->version -> $module->version !");
            }
    
        } else {    // module not installed yet, so install it
            if (empty($updated_modules)) {
                $strmodulesetup    = get_string("modulesetup");
                print_header($strmodulesetup, $strmodulesetup, $strmodulesetup, "", "", false, "&nbsp;", "&nbsp;");
            }
            print_heading($module->name);
            $updated_modules = true;
            $db->debug = true;
            @set_time_limit(0);  // To allow slow databases to complete the long SQL
            if (modify_database("$fullmod/db/$CFG->dbtype.sql")) {
                $db->debug = false;
                if ($module->id = insert_record("modules", $module)) {
                    notify(get_string("modulesuccess", "", $module->name), "green");
                    echo "<hr />";
                } else {
                    error("$module->name module could not be added to the module list!");
                }
            } else { 
                error("$module->name tables could NOT be set up successfully!");
            }
        }
    }

    if (!empty($updated_modules)) {
        print_continue($return);
        die;
    }
}

?>