<?php

$isUTF8 = getConfig('UTF8converted');

//# convert DB to UTF-8
if (!$GLOBALS['commandline']) {
    ob_end_flush();
    // make sure the browser doesn't buffer it
    for ($i = 0; $i < 10000; ++$i) {
        echo ' '."\n";
    }
}

if (isset($cline['f'])) { //# force
    unset($isUTF8);
}

//# check diskspace. this operation duplicates the space required.
$maxsize = 0;
$req = Sql_Query('select (data_length+index_length) tablesize 
  from information_schema.tables
  where table_schema="' .$GLOBALS['database_name'].'"');

while ($row = Sql_Fetch_Assoc($req)) {
    if ($row['tablesize'] > $maxsize) {
        $maxsize = $row['tablesize'];
    }
}
$maxsize = (int) $maxsize;
$avail = disk_free_space('/'); //# we have no idea where MySql stores the data, so this is only a crude check and warning.

$maxsize = (int) ($maxsize * 1.2); //# add another 20%

$require_confirmation = !isset($_GET['force']) || $_GET['force'] != 'yes';

if ($maxsize > $avail && $require_confirmation) {
    echo '<div class="error">'.s('Converting to UTF-8 requires sufficient diskspace on your system.').'<br/>';
    echo s('The maximum table size in your system is %s and space available on the root filesystem is %s, which means %s is required.',
        formatBytes($maxsize), formatBytes($avail), formatBytes($maxsize - $avail));
    echo ' '.s('This is not a problem if your Database server is on a different filesystem. Click the button to continue.');

    echo ' '.s('Otherwise, free up some diskspace and try again');
    echo '<br/>'.PageLinkButton('converttoutf8&force=yes', s('Confirm UTF8 conversion'));

    echo '</div>';

    return;
}

cl_output(s('Converting DB to use UTF-8, please wait'));

if (empty($isUTF8)) {
    set_time_limit(5000);

    echo s('Converting DB to use UTF-8, please wait').'<br/>';
    //# convert to UTF8
    $dbname = $GLOBALS['database_name'];
    if (!empty($dbname)) {
        //# the conversion complains about a key length
        Sql_Query(sprintf('alter table '.$GLOBALS['tables']['user_blacklist_data'].' change column email email varchar(150) not null unique'));

        $req = Sql_Query('select * from information_schema.columns where table_schema = "'.$dbname.'" and CHARACTER_SET_NAME != "utf8"');

        $dbcolumns = array();
        $dbtables = array();
        while ($row = Sql_Fetch_Assoc($req)) {
            //# make sure to only change our own tables, in case we share with other applications
            if (in_array($row['TABLE_NAME'], array_values($GLOBALS['tables']))) {
                $dbcolumns[] = $row;
                $dbtables[$row['TABLE_NAME']] = $row['TABLE_NAME'];
            }
        }

        cl_output($GLOBALS['I18N']->get('Upgrading the database to use UTF-8, please wait'));
        foreach ($dbtables as $dbtable) {
            set_time_limit(600);
            echo($GLOBALS['I18N']->get('Upgrading table ').' '.$dbtable).'<br/>';
            flush();
            cl_output($GLOBALS['I18N']->get('Upgrading table ').' '.$dbtable);
            Sql_Query(sprintf('alter table %s default charset utf8', $dbtable), 1);
        }

        foreach ($dbcolumns as $dbcolumn) {
            set_time_limit(600);
            echo($GLOBALS['I18N']->get('Upgrading column ').' '.$dbcolumn['COLUMN_NAME']).'<br/>';
            flush();
            cl_output($GLOBALS['I18N']->get('Upgrading column ').' '.$dbcolumn['COLUMN_NAME']);
            Sql_Query(sprintf('alter table %s change column %s %s %s character set utf8',
                $dbcolumn['TABLE_NAME'], $dbcolumn['COLUMN_NAME'], $dbcolumn['COLUMN_NAME'], $dbcolumn['COLUMN_TYPE']),
                1);
        }
        cl_output($GLOBALS['I18N']->get('upgrade to UTF-8, done'));
        saveConfig('UTF8converted', date('Y-m-d H:i'), 0);
    } else {
        echo s('Unable to determine the name of the database to convert');
    }
} else {
    echo s('The DB was already converted to UTF-8 on').' '.$isUTF8;
    cl_output(s('The DB was already converted to UTF-8 on').' '.$isUTF8);
}

echo '<br/>'.s('All Done');