<?php

/*
 * vvv - API to Panel - vvv
 */

HandleParameters();

/**
 * Handles the API parameters.
 */
function HandleParameters()
{

	$get = Request::get('get', 0, 'string');
	$uuid = Request::get('uuid', false, 'string');
	$output = null;
	if ($get === "timestamp") {
		$output = [
			'ts' => getLastChangeTs($uuid),
			'now' => round(microtime(true) * 1000),
		];
	} elseif ($get === "machines") {
		$locationIds = LocationInfo::getLocationsOr404($uuid);
		$output = array();
		InfoPanel::appendMachineData($output, $locationIds, true);
		$output = array_values($output);
	} elseif ($get === "config") {
		$type = InfoPanel::getConfig($uuid, $output);
		if ($type === null) {
			http_response_code(404);
			die('Panel not found');
		}
	} elseif ($get === "pcstates") {
		$locationIds = LocationInfo::getLocationsOr404($uuid);
		$output = getPcStates($locationIds, $uuid);
	} elseif ($get === "locationtree") {
		$locationIds = LocationInfo::getLocationsOr404($uuid);
		$output = Location::getTree(...$locationIds);
	} elseif ($get === "calendar") {
		$locationIds = LocationInfo::getLocationsOr404($uuid);
		$output = LocationInfo::getCalendar($locationIds, time() + 3);
	} elseif ($get === "manifest") {
		$output = generateManifest($uuid);
	} elseif ($get === 'list') {
		$output = generatePublicPanelList();
	}
	if ($output !== null) {
		Header('Content-Type: application/json; charset=utf-8');
		echo json_encode($output);
	} else {
		http_response_code(404);
		echo 'Unknown get option';
	}
}

/**
 * Get last config modification timestamp for given panel.
 * This is incomplete however, as it wouldn't react to the
 * linked room plan being edited, or added/removed PCs
 * etc. So the advice would simply be "if you want the
 * panel to reload automatically, hit the edit button
 * and click save". Might even add a shortcut
 * reload-button to the list of panels at some point.
 *
 * @param string $paneluuid panels uuid
 * @return int UNIX_TIMESTAMP
 */
function getLastChangeTs(string $paneluuid): int
{
	$panel = Database::queryFirst('SELECT lastchange, locationids FROM locationinfo_panel WHERE paneluuid = :paneluuid',
		compact('paneluuid'));
	if ($panel === false) {
		http_response_code(404);
		die('Panel not found');
	}
	$lastChange = array((int)$panel['lastchange']);
	if (!empty($panel['locationids'])) {
		$res = Database::simpleQuery('SELECT lastchange FROM locationinfo_locationconfig
				WHERE locationid IN (:locs)', array('locs' => explode(',', $panel['locationids'])));
		while (($lc = $res->fetchColumn()) !== false) {
			$lastChange[] = (int)$lc;
		}
	}
	return max($lastChange);
}

/**
 * Gets the pc states of the given locations.
 *
 * @param int[] $idList list of the location ids.
 * @return array aggregated PC states
 */
function getPcStates(array $idList, string $paneluuid): array
{
	$pcStates = array();
	foreach ($idList as $id) {
		$pcStates[$id] = array(
			'id' => $id,
			'idle' => 0,
			'occupied' => 0,
			'offline' => 0,
			'broken' => 0,
			'standby' => 0,
		);
	}

	$locationInfoList = array();
	InfoPanel::appendMachineData($locationInfoList, $idList);

	$panel = Database::queryFirst('SELECT paneluuid, panelconfig FROM locationinfo_panel WHERE paneluuid = :paneluuid',
		compact('paneluuid'));
	$config = json_decode($panel['panelconfig'], true);

	foreach ($locationInfoList as $locationInfo) {
		$id = $locationInfo['id'];
		foreach ($locationInfo['machines'] as $pc) {
			$key = strtolower($pc['pcState']);
			if (isset($pcStates[$id][$key])) {
				if ($config['roomplanner']) {
					if (isset($pc['x']) && isset($pc['y'])) {
						$pcStates[$id][$key]++;
					}
				} else {
					$pcStates[$id][$key]++;
				}
			}
		}
	}

	return array_values($pcStates);
}

/**
 * Generates a web application manifest for a panel.
 *
 * @param string $uuid The UUID of the panel.
 * @return array The generated manifest file data.
 */
function generateManifest(string $uuid): array
{
	$row = Database::queryFirst("SELECT panelname FROM locationinfo_panel WHERE paneluuid = :paneluuid",
		['paneluuid' => $uuid]);
	if ($row === false)
		return ['error' => 'Not found'];
	$data = [
		"name" => $row['panelname'],
		"short_name" => $row['panelname'],
		"start_url" => "/panel/$uuid",
		"display_override" => [
			"fullscreen",
			"standalone",
			"tabbed",
			"minimal-ui"
		],
		"display" => "fullscreen",
		"icons" => [
			[
				"src" => "/panel/style/icon.svg",
				"sizes" => "any",
				"type" => "image/svg+xml"
			]
		],
	];
	foreach (glob('style/icon*.png', GLOB_NOSORT) as $file) {
		if (!preg_match('/icon(\d+)\.png$/', $file, $m))
			continue;
		$data['icons'][] = [
			"src" => "/panel/$file",
			"sizes" => "${m[1]}x${m[1]}",
			"type" => "image/png",
		];
	}
	return $data;
}

function generatePublicPanelList(): array
{
	$base = Util::shouldRedirectDomain();
	if ($base !== null) {
		$base = 'https://' . $base;
	} else {
		$base = ($_SERVER['HTTPS'] ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'];
	}
	$result = [
		'server_name' => 'To be filled by O.E.M.',
		'panels' => [],
	];
	$res = Database::simpleQuery("SELECT paneluuid, panelname FROM locationinfo_panel WHERE ispublic = 1");
	foreach ($res as $row) {
		$result['panels'][] = [
			'title' => $row['panelname'],
			'url' => $base . '/panel/' . $row['paneluuid'],
		];
	}
	return $result;
}