# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

###############################################################################
# ScribeEngine - Open Source Content Management System                        #
# --------------------------------------------------------------------------- #
# Copyright (c) Raoul Snyman                                                  #
# --------------------------------------------------------------------------- #
# 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; version 2 of the License.                              #
#                                                                             #
# 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, write to the Free Software Foundation, Inc., 59  #
# Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
###############################################################################
"""
The :mod:`~scribeengine.config` module contains helper classes for config handling
"""
from argparse import ArgumentParser
from configparser import ConfigParser


def parse_args():
    parser = ArgumentParser()
    parser.add_argument('-t', '--db-type', metavar="TYPE",
                        help='The type of database to use. Options are "sqlite", "mysql" or "postgres". '
                             'Defaults to "sqlite"')
    parser.add_argument('-d', '--db-name', metavar='NAME',
                        help='The name of the database. For "sqlite" this will be the filename. '
                             'Defaults to "scribeengine" or "scribeengine.sqlite"')
    parser.add_argument('-H', '--db-host', metavar='HOSTNAME',
                        help='The hostname or IP address of the database server. Defaults to "localhost"')
    parser.add_argument('-p', '--db-port', metavar='PORT', type=int,
                        help='The database server port. Defaults to 3306 for "mysql" and 5432 for "postgres"')
    parser.add_argument('-c', '--config', metavar='FILENAME',
                        help='The filename to write the configuration to. Defaults to "config.ini"')
    parser.add_argument('-n', '--non-interactive', action='store_true',
                        help='Run non-interactively. Defaults will be used for arguments not supplied')
    return parser.parse_args()


def write_config_file(config, filename):
    """
    Write the generated config to a file
    """
    parser = ConfigParser()
    for section, options in config.items():
        if not parser.has_section(section):
            parser.add_section(section)
        for option, value in options.items():
            parser.set(section, option, value)
    with open(filename, "w") as config_file:
        parser.write(config_file)


def prompt(question, options=None, default=None, type_=str):
    """
    Prompt the user for an answer, returning the default value if none is given.
    """
    if options:
        question = '{question} ({options})'.format(question=question, options='/'.join(options))
    if default:
        question = '{question} [{default}]'.format(question=question, default=default)
    answer = input('{question}: '.format(question=question)).strip()
    if not answer:
        return default
    elif not isinstance(answer, type_):
        answer = type_(answer)
    return answer


def ask_db_questions():
    db_type = prompt('Database type', ['sqlite', 'mysql', 'postgres'], 'sqlite').lower()
    if db_type == 'sqlite':
        db_name = prompt('Database filename',  default='scribeengine.sqlite')
        return '{db_type}:///{db_name}'.format(db_type=db_type, db_name=db_name)
    db_name = prompt('Database name', default='scribeengine')
    db_user = prompt('Database user', default='scribeengine')
    db_password = prompt('Database password', default='mysupersecretpassword')
    db_host = prompt('Database host', default='localhost')
    if db_type in ['mysql', 'mariadb']:
        db_port = prompt('Database port', default=3306, type_=int)
    elif db_type == 'postgres':
        db_port = prompt('Database port', default=5432, type_=int)
    else:
        db_port = prompt('Database port', default=0, type_=int)
    return '{db_type}://{db_user}:{db_password}@{db_host}:{db_port}/{db_name}'.format(db_type=db_type,
                                                                                      db_user=db_user,
                                                                                      db_password=db_password,
                                                                                      db_host=db_host,
                                                                                      db_port=db_port,
                                                                                      db_name=db_name)


def run_cmd():
    """
    Ask the user a set of questions, and then write them to a config file.
    """
    args = parse_args()
    config = {
        'sqlalchemy': {
            'database_uri': ask_db_questions()
        }
    }
    write_config_file(config, args.config or 'config.ini')