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from __future__ import print_function

import argparse
import sys
import pkg_resources

from bloom.util import add_global_arguments
from bloom.util import handle_global_arguments

BLOOM_GENERATE_CMDS_GROUP = 'bloom.generate_cmds'


def list_generator_commands():
    generators = []
    for entry_point in pkg_resources.iter_entry_points(group=BLOOM_GENERATE_CMDS_GROUP):
        generators.append(entry_point.name)
    return generators


def load_generator_description(generator_name):
    for entry_point in pkg_resources.iter_entry_points(group=BLOOM_GENERATE_CMDS_GROUP):
        if entry_point.name == generator_name:
            return entry_point.load()


def create_subparsers(parser, generator_cmds):
    metavar = '[' + ' | '.join(generator_cmds) + ']'
    subparsers_kwargs = {
      'title': 'generate commands',
      'metavar': metavar,
      'description': 'Call `bloom-generate {0} -h` for help on a each generate command.'.format(metavar),
      'dest': 'generator_cmd'
    }
    if sys.version_info >= (3, 7):
        subparsers_kwargs['required'] = True
    subparsers = parser.add_subparsers(**subparsers_kwargs)
    for generator_cmd in generator_cmds:
        desc = load_generator_description(generator_cmd)
        cmd_parser = subparsers.add_parser(desc['title'], description=desc['description'])
        cmd_parser = desc['prepare_arguments'](cmd_parser)
        cmd_parser.set_defaults(func=desc['main'])
        add_global_arguments(cmd_parser)


def main(sysargs=None):
    parser = argparse.ArgumentParser(
        description="Calls a generator on a local package, e.g. bloom-generate debian"
    )

    generator_cmds = list_generator_commands()

    create_subparsers(parser, generator_cmds)

    args = parser.parse_args(sysargs)
    handle_global_arguments(args)

    sys.exit(args.func(args) or 0)
