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from kamaki.logger import get_logger

from kamaki.cli import get_command_group, set_command_params
from kamaki.cli import print_subcommands_help, exec_cmd, update_parser_help
from kamaki.cli import _groups_help, _load_spec_module


kloger = get_logger('kamaki.cli')


def _get_cmd_tree_from_spec(spec, cmd_tree_list):
    for tree in cmd_tree_list:
        if tree.name == spec:
            return tree
    return None


def _get_best_match_from_cmd_tree(cmd_tree, unparsed):
    matched = [term for term in unparsed if not term.startswith('-')]
    while matched:
        try:
            return cmd_tree.get_command('_'.join(matched))
        except KeyError:
            matched = matched[:-1]
    return None


def run(parser, _help):
    group = get_command_group(list(parser.unparsed), parser.arguments)
    if not group:
        parser.parser.print_help()
        _groups_help(parser.arguments)
        exit(0)

    nonargs = [term for term in parser.unparsed if not term.startswith('-')]
    set_command_params(nonargs)

    global _best_match
    _best_match = []

    spec_module = _load_spec_module(group, parser.arguments, '_commands')

    cmd_tree = _get_cmd_tree_from_spec(group, spec_module._commands)

    if _best_match:
        cmd = cmd_tree.get_command('_'.join(_best_match))
    else:
        cmd = _get_best_match_from_cmd_tree(cmd_tree, parser.unparsed)
        _best_match = cmd.path.split('_')
    if cmd is None:
        kloger.info(
            'Unexpected error: failed to load command (-d for details)')
        exit(1)

    update_parser_help(parser, cmd)

    if _help or not cmd.is_command:
        parser.parser.print_help()
        print_subcommands_help(cmd)
        exit(0)

    cls = cmd.get_class()
    executable = cls(parser.arguments)
    parser.update_arguments(executable.arguments)
    #parsed, unparsed = parse_known_args(parser, executable.arguments)
    for term in _best_match:
            parser.unparsed.remove(term)
    exec_cmd(executable, parser.unparsed, parser.parser.print_help)