#  includes/argparser.py
#
#  module version: 1.1.20130625
#


class argparser:
    
    def parse(program_version, protocol_version):
        """
        Parses comand line arguments
        """
        
        import argparse
        
        parser = argparse.ArgumentParser(
            description = "The server side of the "\
                "aliased server remote control",
            add_help = False)
        
        
        parser.add_argument(
            "--help",
            action = "help",
            help = "show this help message and exit")
        
        parser.add_argument(
            "--version",
            action = "version",
            version = "Server version: " + program_version +\
                " / Protocol version: " + protocol_version)
        
        grp_pid_file_failure = parser.add_mutually_exclusive_group()
        grp_pid_file_failure.add_argument(
            "-n",
            "--delete-pid-file",
            action = "store_true",
            help = "deletes the pid file and starts the server")
        
        grp_pid_file_failure.add_argument(
            "-m",
            "--allow-multiple-instances",
            action = "store_true",
            help = "ignores the pid file and starts the server. "\
                "Will not create another pid file.")
        
        parser.add_argument(
            "-v",
            "--verbosity",
            type = int,
            choices = range(0, 4),
            help = "increase output verbosity. Can be from 0 "\
                "(only default output) to 3 (debug messages).")
        
        parser.add_argument(
            "-h",
            "--host",
            help = "IP or hostname (use 0.0.0.0 for all interfaces) on which "\
                "the server should listen")
        
        parser.add_argument(
            "-p",
            "--port",
            help = "the port on which the server should listen")
        
        parser.add_argument(
            "-t",
            "--timeout",
            help = "timeout of a connection in seconds - still "\
                "doesn't work obviously...")
        
        parser.add_argument(
            "-e",
            "--encoding",
            help = "encoding to be used when communicating with clients")
        
        parser.add_argument(
            "--mkpasswd",
            action = "store_true",
            help = "encode a password with SHA512")
        
        return parser.parse_args()