import os
import importlib

from command import CommandRegistry
from commands import core
from nl_processor import parse_potential_commands
from little_shit import get_nl_processors_dir, get_fallback_command_after_nl_processors
from command import hub as cmdhub


def _init():
    _load_processors()


__registry__ = cr = CommandRegistry(init_func=_init)

_fallback_command = get_fallback_command_after_nl_processors()


@cr.register('process')
@cr.restrict(full_command_only=True)
def process(args_text, ctx_msg):
    sentence = args_text.strip()
    potential_commands = parse_potential_commands(sentence)
    potential_commands = sorted(filter(lambda x: x[0] > 60, potential_commands), key=lambda x: x[0], reverse=True)
    if len(potential_commands) > 0:
        most_possible_cmd = potential_commands[0]
        core.echo(
            '识别出最可能的等价命令：\n' + ' '.join((most_possible_cmd[1], most_possible_cmd[2])),
            ctx_msg
        )
        ctx_msg['parsed_data'] = most_possible_cmd[3]
        cmdhub.call(most_possible_cmd[1], most_possible_cmd[2], ctx_msg)
    else:
        if ctx_msg.get('from_voice'):
            # Special for voice message
            if _fallback_command:
                core.echo('暂时无法理解你的意思，下面将使用备用命令 ' + _fallback_command + '……', ctx_msg)
                cmdhub.call(_fallback_command, sentence, ctx_msg)
                return
        core.echo('暂时无法理解你的意思。\n'
                  '由于自然语言识别还非常不完善，建议使用命令来精确控制我。\n'
                  '如需帮助请发送「使用帮助」。', ctx_msg)


def _load_processors():
    processor_mod_files = filter(
        lambda filename: filename.endswith('.py') and not filename.startswith('_'),
        os.listdir(get_nl_processors_dir())
    )
    command_mods = [os.path.splitext(file)[0] for file in processor_mod_files]
    for mod_name in command_mods:
        importlib.import_module('nl_processors.' + mod_name)