<?php

/*
	This file is part of the ParTCP Server project
	Copyright (C) 2023 Martin Wandelt

	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero 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 Affero General Public License for more details.

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

class ParTCP_LC_Service {
	
	public $fileSystem;
	public $dataDir;


	public function __construct( $fileSystem, $dataDir ){
		$this->fileSystem = $fileSystem;
		$this->dataDir = $dataDir;
	}


	public function get_dir( $id ){
		return "provisioning/{$id}";
	}


	public function get_list( $groupId = FALSE ){
		$dir = 'events';
		if ( is_object( $this->groupsClass ) && $groupId ){
			$dir = $this->groupsClass->get_dir( $groupId ) . "/{$dir}";
		}
		if ( ! $this->fileSystem->exists( $dir ) ){
			return array ();
		}
		$eventList = $this->fileSystem->get_listing( $dir );
		$events = array ();
		foreach ( $eventList as $eventId ){
			$eventId = ( $groupId ? "{$groupId}/" : '' ) . $eventId;
			if ( $data = $this->get_data( $eventId ) ){
				$events[] = $data;
			}
		}
		return $events;
	}


	public function get_data( $id ){
		$dir = $this->get_dir( $id );
		$msg = $this->fileSystem->get_recent_contents( $dir, '[0-9]*-{update,definition}*' );
		if ( empty( $msg ) ){
			return FALSE;
		}
		$receipt = yaml_parse( $msg );
		if ( empty( $receipt['Event-Data'] ) ){
			return FALSE;
		}
		$data = $receipt['Event-Data'];
		$data['lot_codes'] = $this->fileSystem->is_not_empty( "{$dir}/lots" );
		return $data;
	}


	public function purge_data( $data ){
		$validKeys = [
			'id' => 0,
			'name' => 0,
			'voting_server' => 0,
			'event_id' => 0,
		];
		return array_intersect_key( $data, $validKeys );
	}


	public function generate_code( $args = [] ){
		$charList = (string) ( $args['char_list'] ?? 'ABCDEFGHJKLMNPQRSTUVWXYZ123456789' );
		$finalLength = (int) ( $args['final_length'] ?? 16 );
		$groupLength = $args['group_length'] ?? 4;
		$groupSeparator = $args['group_separator'] ?? '-'; 
		$crcLength = $args['crc_length'] ?? 0;
		$netLength = $finalLength - $crcLength;
		$charListLength = strlen( $charList ) - 1;
		$code = '';
		for ( $x = 1; $x <= $netLength; $x++ ){
			$code .= $charList[ rand( 0, $charListLength ) ];
		}
		if ( $groupLength ){
			$code .= str_repeat( ' ', $crcLength );
			$code = substr( chunk_split( $code, $groupLength, $groupSeparator ), 0, -1 );
			$code = rtrim( $code, ' ' );
		}
		if ( $crcLength ){
			$code .= substr( crc32( $code ), - $crcLength );
		}
		elseif ( $groupLength ){
			$code = rtrim( $code, $groupSeparator );
		}
		return $code;
	}


	public function string_to_name( $str ){
		$str = strtolower( $str );
		$str = preg_replace( '/\s+/', '-', $str );
		$str = str_replace( ['ä','ö','ü','ß'], ['ae','oe','ue','ss'], $str );
		$str = html_entity_decode( $str, ENT_QUOTES, 'utf-8' );
		$str = htmlentities( $str, ENT_QUOTES, 'utf-8' );
		$str = preg_replace( '/(&)([a-z])([a-z]+;)/i', '$2', $str );
		$str = preg_replace( '/[^a-zA-Z0-9\-\._]/', '', $str );
		return $str;
	}


	public function generate_secret( $eventId ){
		$eventDir = $this->get_dir( $eventId );
		$path = "{$this->dataDir}/{$eventDir}/secret";
		if ( ! file_exists( dirname( $path ) ) ){
			mkdir( dirname( $path ), 0700, TRUE );
		}
		file_put_contents( $path, random_bytes( 64 ) );
		chmod( $path, 0600 );
		return TRUE;
	}


	public function get_secret( $eventId ){
		$eventDir = $this->get_dir( $eventId );
		$path = "{$this->dataDir}/{$eventDir}/secret";
		if ( ! file_exists( $path ) ){
			return FALSE;
		}
		return file_get_contents( $path );
	}

}

// end of file models/lc_service.class.php