<?php
include("config.php");
$API_VERSION = 0.1;

function quit()
{
	$ret = new stdClass;
	$ret->success = False;
	$ret->version = $GLOBALS["API_VERSION"];
	echo(json_encode($ret));
	exit();
}

$ret = new stdClass;
$ret->success = True;
$ret->version = $API_VERSION;

// Make sure we've got at least auth and an action in the request
if (isset($_POST['auth']) && $_POST['auth'] != "" && isset($_POST['action']) && $_POST['action'] != "")
{
	$auth = $_POST['auth'];
	$action = $_POST['action'];
}
else
{
	quit();
}

// Connect to DB
$con = new mysqli($SQL_SERVER, $SQL_USER, $SQL_PASSWORD, $SQL_DATABASE, $SQL_PORT);
if ($con->connect_error)
{
	quit();
}

// Check auth
$stmt = $con->prepare("SELECT id FROM auth WHERE token = ?");
$stmt->bind_param("s", $auth);
$stmt->execute();
$result = $stmt->get_result();
$res = $result->fetch_assoc();
$stmt->close();
if ($res == Null)
{
	quit();
}

// Setup helper functions
function get_lock($con)
{
	$sql = "SELECT GET_LOCK('tile-status-lock', 10)";
	$ret = $con->query($sql)->fetch_array()[0];
	if ($ret == 0)
	{
		quit();
	}
}

function rel_lock($con)
{
	$con->query("SELECT RELEASE_LOCK('tile-status-lock')");
}

function set_status($con, $name, $status, $type)
{
	if ($type == "area")
	{
		// Get parent ID
		$sql = "SELECT id FROM secondLevel WHERE name = ?";
		$stmt = $con->prepare($sql);
		$stmt->bind_param("s", $name);
		$stmt->execute();
		$result = $stmt->get_result();
		$stmt->close();
		if ($result == False)
		{
			rel_lock($con);
			quit();
		}
		$pid = $result->fetch_array()[0];

		// Get status ID
		$sql = "SELECT id FROM status WHERE name = ?";
		$stmt = $con->prepare($sql);
		$stmt->bind_param("s", $status);
		$stmt->execute();
		$result = $stmt->get_result();
		$stmt->close();
		if ($result == False)
		{
			rel_lock($con);
			quit();
		}
		$sid = $result->fetch_array()[0];

		// Update tiles in area
		$sql = "UPDATE tile SET status_id = ? WHERE parent_id = ?";
		$stmt = $con->prepare($sql);
		$stmt->bind_param("ii", $sid, $pid);
		$stmt->execute();
		$stmt->close();
	}
	else
	{
		$sql = "UPDATE tile SET status_id = (SELECT id FROM status WHERE name = ?) WHERE id = ?";
		$stmt = $con->prepare($sql);
		$stmt->bind_param("si", $status, $name);
		$stmt->execute();
		$stmt->close();
	}
}

if ($action == "set")
{
	if (isset($_POST['tile']) && $_POST['tile'] != "")
	{
		get_lock($con);
		set_status($con, $_POST['tile'], $_POST['status'], "tile");
		rel_lock($con);
	}
	else if (isset($_POST['area']) && $_POST['area'] != "")
	{
		get_lock($con);
		set_status($con, $_POST['area'], $_POST['status'], "area");
		rel_lock($con);
	}
	else
	{
		quit();
	}
}
else if ($action == "get-job")
{
	get_lock($con);
	if (isset($_POST["additional-type"]) && $_POST["additional-type"] != "")
	{
		$sql = "SELECT id FROM tile WHERE status_id = (SELECT id FROM status WHERE name = 'pending') OR status_id = (SELECT id FROM status WHERE name = ?) ORDER BY parent_id LIMIT 1";
		$stmt = $con->prepare($sql);
		$stmt->bind_param("s", $_POST["additional-type"]);
	}
	else
	{
		$sql = "SELECT id FROM tile WHERE status_id = (SELECT id FROM status WHERE name = 'pending') ORDER BY parent_id LIMIT 1";
		$stmt = $con->prepare($sql);
	}
	$stmt->execute();
	$result = $stmt->get_result();
	$stmt->close();
	if ($result == False)
	{
		quit();
	}
	$ret->job = $result->fetch_array()[0];
	if ($ret->job == Null)
	{
		$ret->job = "None";
	}
	else
	{
		set_status($con, $ret->job, "started", "tile");
	}
	rel_lock($con);
}
else if ($action == "get-done")
{
	$sql = "SELECT name FROM secondLevel WHERE status_id = (SELECT id FROM status WHERE name = 'done') LIMIT 1";
	$ret->job = $con->query($sql)->fetch_array()[0];
	if ($ret->job == Null)
	{
		$ret->job = "None";
	}
}
else if ($action == "status")
{
	if (isset($_POST['tile']) && $_POST['tile'] != "")
	{
		$sql = "SELECT name FROM status WHERE id = (SELECT status_id FROM tile WHERE id = ?)";
		$pattern = "i";
		$req = $_POST['tile'];
	}
	else if (isset($_POST['area']) && $_POST['area'] != "")
	{
		$sql = "SELECT name FROM status WHERE id = (SELECT status_id FROM secondLevel WHERE name = ?)";
		$pattern = "s";
		$req = $_POST['area'];
	}
	else
	{
		quit();
	}
	$stmt = $con->prepare($sql);
	$stmt->bind_param($pattern, $req);
	$stmt->execute();
	$result = $stmt->get_result();
	if ($result == False)
	{
		quit();
	}
	$res = $result->fetch_assoc();
	$stmt->close();
	if ($res == Null)
	{
		quit();
	}
	$ret->status = $res["name"];
}
else
{
	quit();
}

// https://www.w3schools.com/php/php_mysql_prepared_statements.asp

$con->close();
echo(json_encode($ret));
?>