#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013-2017 Gauvain Pocentek <gauvain@pocentek.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function
import argparse
import functools
import importlib
import re
import sys

import gitlab.config

camel_re = re.compile('(.)([A-Z])')

# custom_actions = {
#    cls: {
#        action: (mandatory_args, optional_args, in_obj),
#    },
# }
custom_actions = {}


def register_custom_action(cls_names, mandatory=tuple(), optional=tuple()):
    def wrap(f):
        @functools.wraps(f)
        def wrapped_f(*args, **kwargs):
            return f(*args, **kwargs)

        # in_obj defines whether the method belongs to the obj or the manager
        in_obj = True
        classes = cls_names
        if type(cls_names) != tuple:
            classes = (cls_names, )

        for cls_name in classes:
            final_name = cls_name
            if cls_name.endswith('Manager'):
                final_name = cls_name.replace('Manager', '')
                in_obj = False
            if final_name not in custom_actions:
                custom_actions[final_name] = {}

            action = f.__name__.replace('_', '-')
            custom_actions[final_name][action] = (mandatory, optional, in_obj)

        return wrapped_f
    return wrap


def die(msg, e=None):
    if e:
        msg = "%s (%s)" % (msg, e)
    sys.stderr.write(msg + "\n")
    sys.exit(1)


def what_to_cls(what):
    return "".join([s.capitalize() for s in what.split("-")])


def cls_to_what(cls):
    return camel_re.sub(r'\1-\2', cls.__name__).lower()


def _get_base_parser(add_help=True):
    parser = argparse.ArgumentParser(
        add_help=add_help,
        description="GitLab API Command Line Interface")
    parser.add_argument("--version", help="Display the version.",
                        action="store_true")
    parser.add_argument("-v", "--verbose", "--fancy",
                        help="Verbose mode (legacy format only)",
                        action="store_true")
    parser.add_argument("-d", "--debug",
                        help="Debug mode (display HTTP requests)",
                        action="store_true")
    parser.add_argument("-c", "--config-file", action='append',
                        help=("Configuration file to use. Can be used "
                              "multiple times."))
    parser.add_argument("-g", "--gitlab",
                        help=("Which configuration section should "
                              "be used. If not defined, the default selection "
                              "will be used."),
                        required=False)
    parser.add_argument("-o", "--output",
                        help=("Output format (v4 only): json|legacy|yaml"),
                        required=False,
                        choices=['json', 'legacy', 'yaml'],
                        default="legacy")
    parser.add_argument("-f", "--fields",
                        help=("Fields to display in the output (comma "
                              "separated). Not used with legacy output"),
                        required=False)

    return parser


def _get_parser(cli_module):
    parser = _get_base_parser()
    return cli_module.extend_parser(parser)


def _parse_value(v):
    if isinstance(v, str) and v.startswith('@'):
        # If the user-provided value starts with @, we try to read the file
        # path provided after @ as the real value. Exit on any error.
        try:
            with open(v[1:]) as fl:
                return fl.read()
        except Exception as e:
            sys.stderr.write("%s\n" % e)
            sys.exit(1)

    return v


def main():
    if "--version" in sys.argv:
        print(gitlab.__version__)
        exit(0)

    parser = _get_base_parser(add_help=False)
    # This first parsing step is used to find the gitlab config to use, and
    # load the propermodule (v3 or v4) accordingly. At that point we don't have
    # any subparser setup
    (options, args) = parser.parse_known_args(sys.argv)

    config = gitlab.config.GitlabConfigParser(options.gitlab,
                                              options.config_file)
    cli_module = importlib.import_module('gitlab.v%s.cli' % config.api_version)

    # Now we build the entire set of subcommands and do the complete parsing
    parser = _get_parser(cli_module)
    args = parser.parse_args(sys.argv[1:])

    config_files = args.config_file
    gitlab_id = args.gitlab
    verbose = args.verbose
    output = args.output
    fields = []
    if args.fields:
        fields = [x.strip() for x in args.fields.split(',')]
    debug = args.debug
    action = args.action
    what = args.what

    args = args.__dict__
    # Remove CLI behavior-related args
    for item in ('gitlab', 'config_file', 'verbose', 'debug', 'what', 'action',
                 'version', 'output'):
        args.pop(item)
    args = {k: _parse_value(v) for k, v in args.items() if v is not None}

    try:
        gl = gitlab.Gitlab.from_config(gitlab_id, config_files)
        if gl.private_token or gl.oauth_token:
            gl.auth()
    except Exception as e:
        die(str(e))

    if debug:
        gl.enable_debug()

    cli_module.run(gl, what, action, args, verbose, output, fields)

    sys.exit(0)
