<?php
/*
davina — Calendar data CalDAV conditioner
Copyright (C) 2025 Fenris <fenris@folksprak.org>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public 
License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later 
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied 
warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see 
<https://www.gnu.org/licenses/>. 
 */

namespace davina\conf;

require_once(DIR_LOGIC . '/helpers/list.php');


/**
 */
class _state
{
	public static $data = null;
}


/**
 */
function validate_realm_name(
	string $realm_name
) : string
{
	$matchs = null;
	$result = preg_match('/^[0-9a-zA-Z]+$/', $realm_name, $matches);
	return ($result === 1);
}


/**
 */
function load(
	string $path
) : void
{
	$data_raw = \json_decode(
		\file_get_contents(
			$path
		),
		true
	);
	_state::$data = [
		/**
		 * @todo check for name duplicates
		 */
		'realms' => \davina\helpers\list_\map(
			$data_raw['realms'],
			function ($realm_raw) {
				if (! validate_realm_name($realm_raw['name']))
				{
					throw (new \Exception(\sprintf('invalid realm name: "%s"', $realm_raw['name'])));
				}
				else
				{
					return [
						'name' => $realm_raw['name'],
						'auth' => (function ($auth_raw) use ($realm_raw) {
							switch ($auth_raw['kind'])
							{
								case 'pass_through':
								{
									return [
										'kind' => 'pass_through',
										'data' => null
									];
									break;
								}
								case 'static':
								{
									return [
										'kind' => 'static',
										'data' => [
											'password' => ($auth_raw['data']['password'] ?? $realm_raw['name']),
										]
									];
									break;
								}
								default:
								{
									throw (new \Exception(\sprintf('invalid auth kind: %s', $auth_raw['kind'])));
									break;
								}
							}
						}) ($realm_raw['auth']),
						'source' => (function ($source_raw) {
							switch ($source_raw['kind'])
							{
								case 'ics_feed':
								{
									return [
										'kind' => 'ics_feed',
										'data' => [
											'url' => $source_raw['data']['url'],
											'lifetime' => ($source_raw['data']['lifetime'] ?? (60 * 15)),
											'conflate' => ($source_raw['data']['conflate'] ?? true),
										]
									];
									break;
								}
								default:
								{
									throw (new \Exception(\sprintf('invalid source kind: %s', $source_raw['kind'])));
								}
							}
						}) ($realm_raw['source']),
					];
				}
			}
		),
		'settings' => [
			'timezone' => (($data_raw['settings'] ?? [])['timezone'] ?? 'UTC'),
		]
	];
}


/**
 */
function get(
)
{
	if (_state::$data === null)
	{
		throw (new \Exception('not yet loaded'));
	}
	else
	{
		return _state::$data;
	}
}

 ?>