<?php
defined( 'ABSPATH' ) or die( 'Access forbidden!' );

$TABLE = $_GET["foreign"];
$name = $_GET["name"];
$row = $_POST;

if ($_POST && !$error && !$_POST["add"] && !$_POST["change"] && !$_POST["change-js"]) {
	$message = ($_POST["drop"] ? lang('Foreign key has been dropped.') : ($name != "" ? lang('Foreign key has been altered.') : lang('Foreign key has been created.')));
	$location = ME . "table=" . urlencode($TABLE);
	
	if (!$_POST["drop"]) {
		$row["source"] = array_filter($row["source"], 'strlen');
		ksort($row["source"]); // enforce input order
		$target = array();
		foreach ($row["source"] as $key => $val) {
			$target[$key] = $row["target"][$key];
		}
		$row["target"] = $target;
	}
	
	if ($jush == "sqlite") {
		queries_redirect($location, $message, recreate_table($TABLE, $TABLE, array(), array(), array(" $name" => ($_POST["drop"] ? "" : " " . format_foreign_key($row)))));
	} else {
		$alter = "ALTER TABLE " . table($TABLE);
		$drop = "\nDROP " . ($jush == "sql" ? "FOREIGN KEY " : "CONSTRAINT ") . idf_escape($name);
		if ($_POST["drop"]) {
			query_redirect($alter . $drop, $location, $message);
		} else {
			query_redirect($alter . ($name != "" ? "$drop," : "") . "\nADD" . format_foreign_key($row), $location, $message);
			$error = lang('Source and target columns must have the same data type, there must be an index on the target columns and referenced data must exist.') . "<br>$error"; //! no partitioning
		}
	}
}

page_header(lang('Foreign key'), $error, array("table" => $TABLE), h($TABLE));

if ($_POST) {
	ksort($row["source"]);
	if ($_POST["add"]) {
		$row["source"][] = "";
	} elseif ($_POST["change"] || $_POST["change-js"]) {
		$row["target"] = array();
	}
} elseif ($name != "") {
	$foreign_keys = foreign_keys($TABLE);
	$row = $foreign_keys[$name];
	$row["source"][] = "";
} else {
	$row["table"] = $TABLE;
	$row["source"] = array("");
}

$source = array_keys(fields($TABLE)); //! no text and blob
$target = ($TABLE === $row["table"] ? $source : array_keys(fields($row["table"])));
$referencable = array_keys(array_filter(table_status('', true), 'fk_support'));
?>

<form action="" method="post">
<p>
<?php if ($row["db"] == "" && $row["ns"] == "") { ?>
<?php echo lang('Target table'); ?>:
<?php echo html_select("table", $referencable, $row["table"], "this.form['change-js'].value = '1'; this.form.submit();"); ?>
<input type="hidden" name="change-js" value="">
<noscript><p><input type="submit" name="change" value="<?php echo lang('Change'); ?>"></noscript>
<table cellspacing="0">
<thead><tr><th id="label-source"><?php echo lang('Source'); ?><th id="label-target"><?php echo lang('Target'); ?></thead>
<?php
$j = 0;
foreach ($row["source"] as $key => $val) {
	echo "<tr>";
	echo "<td>" . html_select("source[" . (+$key) . "]", array(-1 => "") + $source, $val, ($j == count($row["source"]) - 1 ? "foreignAddRow.call(this);" : 1), "label-source");
	echo "<td>" . html_select("target[" . (+$key) . "]", $target, $row["target"][$key], 1, "label-target");
	$j++;
}
?>
</table>
<p>
<?php echo lang('ON DELETE'); ?>: <?php echo html_select("on_delete", array(-1 => "") + explode("|", $on_actions), $row["on_delete"]); ?>
 <?php echo lang('ON UPDATE'); ?>: <?php echo html_select("on_update", array(-1 => "") + explode("|", $on_actions), $row["on_update"]); ?>
<?php echo doc_link(array(
	'sql' => "innodb-foreign-key-constraints.html",
	'mariadb' => "foreign-keys/",
	'pgsql' => "sql-createtable.html#SQL-CREATETABLE-REFERENCES",
	'mssql' => "ms174979.aspx",
	'oracle' => "clauses002.htm#sthref2903",
)); ?>
<p>
<input type="submit" value="<?php echo lang('Save'); ?>">
<noscript><p><input type="submit" name="add" value="<?php echo lang('Add column'); ?>"></noscript>
<?php } ?>
<?php if ($name != "") { ?><input type="submit" name="drop" value="<?php echo lang('Drop'); ?>"><?php echo confirm(lang('Drop %s?', $name)); ?><?php } ?>
<input type="hidden" name="token" value="<?php echo $token; ?>">
</form>
