#!/usr/bin/env python
# -*- coding: utf-8 -*-

__credits__ = """
    Copyright (C) 2012 YunoHost

    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 http://www.gnu.org/licenses
    """
__author__  = 'Kload <kload@kload.fr>'
__version__ = '2.0 beta1'

import sys
import argparse
import gettext
sys.path.append('lib') # Local temporary hack
gettext.install('YunoHost')
import yunohost_messages as msg

def str_to_func(astr):
    """
    Call a function from a string name
    
    Keyword arguments:
        astr -- Name of function to call
    
    Returns: 
        Function

    """
    module, _, function = astr.rpartition('.')
    if module:
        __import__(module)
        mod = sys.modules[module]
    else:
        mod = sys.modules['__main__']  # default module
    
    try:
        func = getattr(mod, function)
    except NameError:
        print(msg.error + _('Function is not defined'))
        sys.exit(1)
    else:
        return func


def dict_to_parsers(action_dict):
    """
    Turn action dictionnary to parser and subparsers (2 level)
    
    Keyword arguments:
        action_dict -- Multi-level dictionnary of categories/actions list
    
    Returns: 
        Dictionnrary of parsers

    """
    # Intialize parsers
    parsers = subparsers_category = subparsers_action = dict()
    parsers['general'] = argparse.ArgumentParser()
    subparsers = parsers['general'].add_subparsers()

    # Compute dictionnary
    for category, info in action_dict.items():
        subparsers_category[category] = subparsers.add_parser(category, help=info['help'])
        subparsers_action[category] = subparsers_category[category].add_subparsers()
        for action, helper in info['actions'].items():
            parsers[category + '_' + action] = subparsers_action[category].add_parser(action, help=helper)
            parsers[category + '_' + action].set_defaults(
                func=str_to_func('yunohost_' + category + '.' 
                                 + category + '_' + action)) 

    return parsers


def parse_args(parsers):
    """
    Add and parse arguments

    Keyword arguments:
        parsers -- parsers and subparsers as a dict    
    
    Returns: 
        Namespace of arguments

    Usage:
        Add general argument: parsers['general'].add_argument( options )
        Add specific argument: parsers['user_delete'].add_argument( options )
    
    Documentation: 
        http://docs.python.org/dev/library/argparse.html
        #argparse.ArgumentParser.add_argument 
     
    """
    #####################
    #      General      #
    #####################

    # Version
    parsers['general'].add_argument(
        '-v', 
        '--version', 
        action='version',
        version='%(prog)s ' +  __version__
    )

    #####################
    #       User        #
    #####################

    # user list
    parsers['user_list'].add_argument('-a', '--all', action='store_true')

    # user add
    parsers['user_add'].add_argument('-u', '--username')
    parsers['user_add'].add_argument('-m', '--mail')
    parsers['user_add'].add_argument('-f', '--firstname')
    parsers['user_add'].add_argument('-l', '--lastname')
    parsers['user_add'].add_argument('-p', '--password')


    #########################    
    #   End of arguments    #
    #########################
    args = parsers['general'].parse_args()
    return args



def main():
    """ Main instructions """

    action_dict = {
        'user' : {
            'help'    : 'Manage users',
            'actions' : {
                'list'      : 'List users',
                'add'       : 'Add user'
            }
        },
        'domain' : {
            'help'    : 'Manage domains',
            'actions' : {}
        },
        'app' : {
            'help'    : 'Manage apps',
            'actions' : {}
        },
        'monitor' : {
            'help'    : 'Monitoring functions',
            'actions' : {}
        },
        'tools' : {
            'help'    : 'Specific tools',
            'actions' : {}
        }
    }

    parsers = dict_to_parsers(action_dict) 
    args = parse_args(parsers)
    args.func(vars(args))


if __name__ == '__main__':
    main()