<?php // $Id$

function choice_upgrade($oldversion) {
    
    global $CFG;

// This function does anything necessary to upgrade
// older versions to match current functionality

    if ($oldversion < 2002090800) {
        execute_sql(" ALTER TABLE `choice` CHANGE `answer1` `answer1` VARCHAR( 255 )");
        execute_sql(" ALTER TABLE `choice` CHANGE `answer2` `answer2` VARCHAR( 255 )");
    }
    if ($oldversion < 2002102400) {
        execute_sql(" ALTER TABLE `choice` ADD `answer3` varchar(255) NOT NULL AFTER `answer2`");
        execute_sql(" ALTER TABLE `choice` ADD `answer4` varchar(255) NOT NULL AFTER `answer3`");
        execute_sql(" ALTER TABLE `choice` ADD `answer5` varchar(255) NOT NULL AFTER `answer4`");
        execute_sql(" ALTER TABLE `choice` ADD `answer6` varchar(255) NOT NULL AFTER `answer5`");
    }
    if ($oldversion < 2002122300) {
        execute_sql("ALTER TABLE `choice_answers` CHANGE `user` `userid` INT(10) UNSIGNED DEFAULT '0' NOT NULL ");
    }
    if ($oldversion < 2003010100) {
        execute_sql(" ALTER TABLE `choice` ADD `format` TINYINT(2) UNSIGNED DEFAULT '0' NOT NULL AFTER `text` ");
        execute_sql(" ALTER TABLE `choice` ADD `publish` TINYINT(2) UNSIGNED DEFAULT '0' NOT NULL AFTER `answer6` ");
    }

    if ($oldversion < 2004010100) {
        table_column("choice", "", "showunanswered", "integer", "4", "unsigned", "0", "", "publish");
    }
    if ($oldversion < 2004021700) {
        modify_database("", "INSERT INTO prefix_log_display VALUES ('choice', 'choose', 'choice', 'name');");
        modify_database("", "INSERT INTO prefix_log_display VALUES ('choice', 'choose again', 'choice', 'name');");
    }
    if ($oldversion < 2004070100) {
        table_column("choice", "", "timeclose", "integer", "10", "unsigned", "0", "", "showunanswered");
        table_column("choice", "", "timeopen", "integer", "10", "unsigned", "0", "", "showunanswered");
    }
    if ($oldversion < 2004070101) {
        table_column("choice", "", "release", "integer", "2", "unsigned", "0", "", "publish");
        table_column("choice", "", "allowupdate", "integer", "2", "unsigned", "0", "", "release");
    }
    if ($oldversion < 2004070102) {
        modify_database("", "UPDATE prefix_choice SET allowupdate = '1' WHERE publish = 0;");
        modify_database("", "UPDATE prefix_choice SET release = '1' WHERE publish > 0;");
        modify_database("", "UPDATE prefix_choice SET publish = publish - 1 WHERE publish > 0;");
    }

    if ($oldversion < 2004111200){  // drop first to avoid conflicts when upgrading from 1.4+
        execute_sql("ALTER TABLE {$CFG->prefix}choice DROP INDEX course;",false);
        execute_sql("ALTER TABLE {$CFG->prefix}choice_answers DROP INDEX choice;",false);
        execute_sql("ALTER TABLE {$CFG->prefix}choice_answers DROP INDEX userid;",false);       
        
        modify_database('','ALTER TABLE prefix_choice ADD INDEX course (course);');
        modify_database('','ALTER TABLE prefix_choice_answers ADD INDEX choice (choice);');
        modify_database('','ALTER TABLE prefix_choice_answers ADD INDEX userid (userid);');
    }
    
    if ($oldversion < 2005033001){  
        if (execute_sql("CREATE TABLE {$CFG->prefix}choice_options (
                             `id` int(10) unsigned NOT NULL auto_increment, 
                             `choiceid` int(10) unsigned NOT NULL default '0', 
                             `text` TEXT, 
                             `timemodified` int(10) NOT NULL default '0', 
                             PRIMARY KEY  (id), 
                             UNIQUE KEY id (id), 
                             KEY choiceid (choiceid)
                         ) TYPE=MyISAM;")) {
    
            table_column('choice_answers', 'choice', 'choiceid', 'integer', '10', 'unsigned', 0, 'not null');
            table_column('choice_answers', 'answer', 'optionid', 'integer', '10', 'unsigned', 0, 'not null');
    
            table_column('choice', '', 'display', 'integer', '4', 'unsigned', 0, 'not null', 'release');
    
            
            /// move old answers from choice to choice_options
    
            if ($choices = get_records('choice')) {
                foreach ($choices as $choice) {
                    for ($i=1; $i<=6; $i++) {      // We used to have six columns
                        $option = new stdClass;
                        $option->text         = $choice->{'answer'.$i};
                        if ($option->text) {   /// Don't bother with blank options
                            $option->choiceid     = $choice->id;
                            $option->timemodified = $choice->timemodified;
                            if ($option->id = insert_record('choice_options', $option)) { 
                                /// Update all the user answers to fit the new value
                                execute_sql("UPDATE {$CFG->prefix}choice_answers 
                                                SET optionid='$option->id' 
                                              WHERE choiceid='$choice->id' 
                                                AND optionid='$i'");                                                            
                            }
                        }
                    }
                }
            }
            
            //drop old fields
    
            modify_database('','ALTER TABLE prefix_choice DROP `answer1`;');
            modify_database('','ALTER TABLE prefix_choice DROP `answer2`;');
            modify_database('','ALTER TABLE prefix_choice DROP `answer3`;');
            modify_database('','ALTER TABLE prefix_choice DROP `answer4`;');
            modify_database('','ALTER TABLE prefix_choice DROP `answer5`;');
            modify_database('','ALTER TABLE prefix_choice DROP `answer6`;');

        } else {
            notify('SERIOUS PROBLEM OCCURRED WHILE UPGRADING A TABLE - you may have to manually upgrade your tables ... see mod/choice/db/mysql.php');
            return false;
        }
    }
    
    if ($oldversion < 2005041100) { // replace wiki-like with markdown
        include_once( "$CFG->dirroot/lib/wiki_to_markdown.php" );
        $wtm = new WikiToMarkdown();
        $wtm->update( 'choice','text','format' );
    }

    return true;
}


?>