from os import listdir
from os.path import realpath, dirname, join, isdir
from sys import version_info
from searx.utils import load_module
from collections import defaultdict

if version_info[0] == 3:
    unicode = str


answerers_dir = dirname(realpath(__file__))


def load_answerers():
    answerers = []
    for filename in listdir(answerers_dir):
        if not isdir(join(answerers_dir, filename)) or filename.startswith('_'):
            continue
        module = load_module('answerer.py', join(answerers_dir, filename))
        if not hasattr(module, 'keywords') or not isinstance(module.keywords, tuple) or not len(module.keywords):
            exit(2)
        answerers.append(module)
    return answerers


def get_answerers_by_keywords(answerers):
    by_keyword = defaultdict(list)
    for answerer in answerers:
        for keyword in answerer.keywords:
            for keyword in answerer.keywords:
                by_keyword[keyword].append(answerer.answer)
    return by_keyword


def ask(query):
    results = []
    query_parts = list(filter(None, query.query.split()))

    if query_parts[0].decode('utf-8') not in answerers_by_keywords:
        return results

    for answerer in answerers_by_keywords[query_parts[0].decode('utf-8')]:
        result = answerer(query)
        if result:
            results.append(result)
    return results


answerers = load_answerers()
answerers_by_keywords = get_answerers_by_keywords(answerers)