<?php

require_once("SudokuObject.class.php");

//
// GET-Values
//
$sudokustring = htmlspecialchars($_GET['sudokustring']);
$srow = htmlspecialchars($_GET['row']);
$scolumn = htmlspecialchars($_GET['column']);
$mode = htmlspecialchars($_GET['mode']);
$answer = "";
$level = htmlspecialchars($_GET['level']);

//
// Output
//

if ($mode == "suggest") {
	// Give a textual hint about which numbers are possible 
	// for ($srow,$scolumn)
	$sudokuObj = new SudokuObject;
	try {
		$sudokuObj->sudokuObjectFromString($sudokustring);
		$answer = $sudokuObj->suggestionString($srow,$scolumn);
		if(strlen($answer) == 25) {
			echo "All numbers from 1 to 9.";
		} elseif(strlen($answer) > 1) {
			echo $answer . ".";
		} elseif(strlen($answer) == 0) {
			echo "No suggestions.";
		} else {
			echo "The only option left for this box is " . $answer . ".";
		}
	}
	catch (SudokuException $e) {
		echo $sudokuObj;
		echo "An exception was thrown.";
	}


} elseif ($mode == "nextsteps") {
	// Return a string with coordinates that have only one 
	// option left
	$sudokuObj = new SudokuObject;
	try {
		$sudokuObj->sudokuObjectFromString($sudokustring);
		$answer = $sudokuObj->nextSteps();
		echo $answer;
	}
	catch (SudokuException $e) {
		echo "An exception was thrown.";
	}

} elseif ($mode == "autofill") {
	// Return the coordinates of box we'll fill next
	$sudokuObj = new SudokuObject;
	try {
		$sudokuObj->sudokuObjectFromString($sudokustring);
		$answer = $sudokuObj->autoFill();
		echo $answer;
	}
	catch (SudokuException $e) {
		echo "An exception was thrown.";
	}


} elseif ($mode == "load") {
	// Load an array with difficulty level $level
	$sudokuObj = new SudokuObject;
	try {
		$sudokuObj->sudokuObjectFromDatabase($level);
		$answer = $sudokuObj;
		echo $answer;
	}
	catch (SudokuException $e) {
		echo "An exception was thrown.";
	}
}

?>