<?php
    //This page receives the required info and executes the restore
    //with the parameters suplied. Whe finished, delete temporary
    //data from backup_tables and temp directory

    //Get objects from session
    if ($SESSION) {
        $info = $SESSION->info;
        $course_header = $SESSION->course_header;
        $restore = $SESSION->restore;

        // Validate objects from session by checking their checksums
        $status = false;
        if (isset($SESSION->restore_checksums)) {
            $checksums = $SESSION->restore_checksums;
            if (isset($checksums['info']) && $checksums['info'] == md5(serialize($info)) &&
                isset($checksums['course_header']) && $checksums['course_header'] == md5(serialize($course_header)) &&
                isset($checksums['restore']) && $checksums['restore'] == md5(serialize($restore))) {

                $status = true; // All session checksums were or, we can rely on that to continue restoring
            }
        }
        if(!$status) { // Something was wrong checking objects from session, abort with error
            print_error('restorechecksumfailed');
        }
    }

    //Add info->original_wwwroot to $restore to be able to use it in all the restore process
    //(mainly when decoding internal links)
    $restore->original_wwwroot = $info->original_wwwroot;
    // Copy $info->original_siteidentifier, is present, so backup_is_same_site can work.
    if (isset($info->original_siteidentifier)) {
        $restore->original_siteidentifier = $info->original_siteidentifier;
    }
    //Add info->backup_version to $restore to be able to detect versions in the restore process
    //(to decide when to convert wiki texts to markdown...)
    $restore->backup_version = $info->backup_backup_version;

    //Check login
    require_login();

    $loginurl = get_login_url();

    //Check admin
    if (!empty($id)) {
        if (!has_capability('moodle/restore:restorecourse', get_context_instance(CONTEXT_COURSE, $id))) {
            if (empty($to)) {
                print_error("cannotuseadminadminorteacher", '', $loginurl);
            } else {
                if (!has_capability('moodle/restore:restorecourse', get_context_instance(CONTEXT_COURSE, $to))
                    && !has_capability('moodle/restore:restoretargetimport',  get_context_instance(CONTEXT_COURSE, $to))) {
                    print_error("cannotuseadminadminorteacher", '', $loginurl);
                }
            }
        }
    } else {
        if (!has_capability('moodle/restore:restorecourse', get_context_instance(CONTEXT_SYSTEM))) {
            print_error("cannotuseadmin", '', $loginurl);
        }
    }

    //Check site
    $site = get_site();
    $errorstr = '';

    $status = restore_execute($restore,$info,$course_header,$errorstr);

    if (!$status) {
        print_error ("cannotrestore");
    }

    if (empty($restore->importing)) {
        //Print final message
        echo $OUTPUT->box(get_string("restorefinished"));
    } else {
        echo $OUTPUT->box(get_string("importdatafinished"));
        $file = $CFG->dataroot . '/'
            . $SESSION->import_preferences->backup_course
            . '/backupdata/' . $SESSION->import_preferences->backup_name;
        if (is_readable($file)) {
            unlink($file);
        }
        else {
            error_log("import course data: couldn't unlink $file");
        }
        unset($SESSION->restore);
    }
    echo $OUTPUT->continue_button("$CFG->wwwroot/course/view.php?id=".$restore->course_id);
