<?php
define('PATH', __DIR__);
define('STORAGE_PATH', (getenv('THINGS_STORAGE_PATH') ? getenv('THINGS_STORAGE_PATH') : __DIR__));

require_once PATH.'/lib/helpers.php';
require_once PATH.'/lib/Router.php';
require_once PATH.'/lib/LibraryRenderer.php';
require_once PATH.'/lib/TinyHtmlMinifier.php';
require_once PATH.'/lib/Mustache/Autoloader.php';

Mustache_Autoloader::register();

$endpoints = [
	'editor' => function() {
		exit(file_get_contents('editor.html'));
	},

	'renderList' => function ($id = NULL) {
		global $storage;

		if ( $storage['library'] === "" ) exit("No data yet!");

		$library = json_decode($storage['library'], true);
		$listIds = array_column($library['lists'], 'id');

		if ( array_search($id, $listIds) === false ) {
			header('Location: /list/'.$library['defaultListId']);
			exit();
		}

		$tpl          = new Mustache_Engine(['loader' => new Mustache_Loader_FilesystemLoader(PATH.'/templates')]);
		$minifier     = new TinyHtmlMinifier([]);
		$templateData = new LibraryRenderer($library, (int) $id);
	
		exit($minifier->minify($tpl->render('view', $templateData)));
	},


	'exportCSV' => function ($id) {
		global $storage;

		if ( !isset($_COOKIE['lp']) || $_COOKIE['lp'] !== $storage['sessionCookie'] ) {
			response(401, 'Invalid session');
		} else {
			$mgToWeight  = function(int $value, string $unit) {
				if ( $unit === 'g' ) {
					return number_format(($value / 1000), 0);
				} elseif ( $unit === 'kg' ) {
					return number_format(($value / 1000000), 2);
				}
			};

			$library     = json_decode($storage['library'], true);
			$categoryIds = array_column($library['categories'], 'id');
			$itemIds     = array_column($library['items'], 'id');
			$listIds     = array_column($library['lists'], 'id');
			$listId      = array_search($id, $listIds);

			if ( $listId === false ) exit('List not found!');

			$output = fopen('php://output', 'w');
			$list   = $library['lists'][$listId];

			header('Content-type: text/csv');
			fputcsv($output, ['name','category', 'description', 'qty', 'weight', 'unit', 'url', 'price', 'isWorn', 'isConsumable']);

			foreach ( $list['categoryIds'] as $id ) {
				$categoryId = array_search($id, $categoryIds);
				$category   = $library['categories'][$categoryId];

				foreach ( $category['categoryItems'] as $item ) {
					$itemId = array_search($item['itemId'], $itemIds);
					$item   = array_merge($item, $library['items'][$itemId]);

					fputcsv($output, [
						$item['name'],
						$category['name'],
						$item['description'],
						$item['qty'],
						$mgToWeight($item['weight'], $item['authorUnit']),
						$item['authorUnit'],
						$item['url'],
						$item['price'],
						(bool)$item['worn'],
						(bool)$item['consumable'],
					]);
				}
			}

			fclose($output);
		}
	},

	'getLibrary' => function () {
		global $storage, $requestBody;

		if ( isset($_COOKIE['lp']) && $_COOKIE['lp'] === $storage['sessionCookie'] ) {
			response(200, NULL, [
				'library'   => $storage['library'],
				'syncToken' => $storage['syncToken'],
			]);
		}

		if ( !isset($requestBody['password']) || md5($requestBody['password']) !== $storage['password'] ) {
			response(404, 'Incorrect credentials!');
		} else {
			$storage['sessionCookie'] = bin2hex(random_bytes(40));
			setcookie("lp", $storage['sessionCookie'], [
				'expires' => time() + 3600, 
				'path'    => "/",
				'domain'  => $_SERVER['HTTP_HOST'],
				'secure'  => true
			]);

			file_put_contents(STORAGE_PATH.'/storage.json', json_encode($storage));

			response(200, NULL, [
				'library'   => $storage['library'],
				'syncToken' => $storage['syncToken'],
			]);
		}
	},

	'saveLibrary' => function () {
		global $storage, $requestBody;

		if ( !isset($_COOKIE['lp']) || $_COOKIE['lp'] !== $storage['sessionCookie'] ) {
			response(401, 'Invalid session');
		} else {
			if ( isset($requestBody['library']) && isset($requestBody['syncToken']) ) {
				if ( $storage['syncToken'] === $requestBody['syncToken'] ) {

					$storage['syncToken']++;
					$storage['library'] = $requestBody['library'];

					file_put_contents(STORAGE_PATH.'/storage.json', json_encode($storage));

					response(200, 'success', [
						'syncToken' => $storage['syncToken'],
					]);

				} else {
					response(400, 'Your list is out of date - please refresh your browser.');
				}
			} else {
				response(400, 'Missing arguments!');
			}
		}
	},

	'changePassword' => function () {
		global $storage, $requestBody;

		if ( !isset($_COOKIE['lp']) || $_COOKIE['lp'] !== $storage['sessionCookie'] ) {
			response(401, 'Invalid session');
		} else {
			if ( isset($requestBody['currentPassword']) && isset($requestBody['newPassword']) ) {
				if ( md5($requestBody['currentPassword']) === $storage['password'] ) {
					$storage['password'] = md5($requestBody['newPassword']);

					file_put_contents(STORAGE_PATH.'/storage.json', json_encode($storage));
				} else {
					response(400, 'Incorrect credentials!');
				}
			} else {
				response(400, 'Missing arguments!');
			}	
		}	
	},
];

$requestBody = json_decode(file_get_contents('php://input'), true);

if ( !file_exists(STORAGE_PATH . '/storage.json') ) {
	$storage = [
		'password'      => 'ae2d699aca20886f6bed96a0425c6168',
		'sessionCookie' => '',
		'library'       => "",
		'syncToken'     => 0,
	];
} else {
	$storage = json_decode(file_get_contents(STORAGE_PATH . '/storage.json'), true);
}

Router::add('GET',  '/',               $endpoints['renderList']);
Router::add('GET',  '/list/([0-9]*)',  $endpoints['renderList']);
Router::add('GET',  '/editor',         $endpoints['editor']);
Router::add('GET',  '/login',          $endpoints['editor']);
Router::add('GET',  '/csv/([0-9]*)',   $endpoints['exportCSV']);
Router::add('POST', '/getLibrary',     $endpoints['getLibrary']);
Router::add('POST', '/saveLibrary',    $endpoints['saveLibrary']);
Router::add('POST', '/changePassword', $endpoints['changePassword']);

Router::pathNotFound(function() {
	header("Loctaion: /");
});

Router::run('/');