# !/usr/bin/python
# -*- coding:utf-8 -*-


import sys
import pinyin
import jieba
import string
import os
from my_config import dirpath
# import re


FILE_PATH = os.path.join(dirpath, "Autochecker4Chinese/token_freq_pos%40350k_jieba.txt")
# G:\zwj\WL\en2cn\Autochecker4Chinese\token_freq_pos%40350k_jieba.txt
PUNCTUATION_LIST = string.punctuation
PUNCTUATION_LIST += "。，？：；｛｝［］‘“”《》／！％……（）"


def construct_dict(file_path):
    word_freq = {}
    with open(file_path, "r", encoding="utf-8") as f:
        for line in f:
            info = line.split()
            word = info[0]
            frequency = info[1]
            word_freq[word] = frequency

    return word_freq


phrase_freq = construct_dict(FILE_PATH)


def load_cn_words_dict(file_path):
    cn_words_dict = ""
    with open(file_path, "r", encoding="utf-8") as f:
        for word in f:
            cn_words_dict += word.strip()
    return cn_words_dict


def edits1(phrase, cn_words_dict):
    """
    All edits that are one edit away from `phrase`
    :param phrase:
    :param cn_words_dict:
    :return:
    """
    splits = [(phrase[:i], phrase[i:]) for i in range(len(phrase) + 1)]
    deletes = [L + R[1:] for L, R in splits if R]
    transposes = [L + R[1] + R[0] + R[2:] for L, R in splits if len(R) > 1]
    replaces = [L + c + R[1:] for L, R in splits if R for c in cn_words_dict]
    inserts = [L + c + R for L, R in splits for c in cn_words_dict]
    return set(deletes + transposes + replaces + inserts)


def known(phrases): return set(phrase for phrase in phrases if phrase in phrase_freq)


def get_candidates(error_phrase):
    candidates_1st_order = []
    candidates_2nd_order = []
    candidates_3nd_order = []

    error_pinyin = pinyin.get(error_phrase, format="strip", delimiter="/").encode("utf-8")
    cn_words_dict = load_cn_words_dict(os.path.join(dirpath, "Autochecker4Chinese/cn_dict.txt"))
    candidate_phrases = list(known(edits1(error_phrase, cn_words_dict)))

    for candidate_phrase in candidate_phrases:
        candidate_pinyin = pinyin.get(candidate_phrase, format="strip", delimiter="/").encode("utf-8")
        if candidate_pinyin == error_pinyin:
            candidates_1st_order.append(candidate_phrase)
        elif candidate_pinyin.decode("utf-8").split("/")[0] == error_pinyin.decode("utf-8").split("/")[0]:
            candidates_2nd_order.append(candidate_phrase)
        else:
            candidates_3nd_order.append(candidate_phrase)

    return candidates_1st_order, candidates_2nd_order, candidates_3nd_order


def auto_correct(error_phrase, flag="max"):
    """
    flag="max":返回最可能的候选项
    flag="all":返回所有候选项
    :param error_phrase:
    :param flag:
    :return:
    """
    c1_order, c2_order, c3_order = get_candidates(error_phrase)
    # print(c1_order)
    # print(c2_order)
    # print(c3_order)
    if flag == "max":
        if c1_order:
            return max(c1_order, key=phrase_freq.get)
        elif c2_order:
            return max(c2_order, key=phrase_freq.get)
        elif c3_order:
            return max(c3_order, key=phrase_freq.get)
        else:
            return error_phrase
    else:
        if c1_order:
            return c1_order
        elif c2_order:
            return c2_order
        elif c3_order:
            return c3_order
        else:
            return []


def auto_correct_sentence(error_sentence, verbose=True):
    jieba_cut = jieba.cut(error_sentence, cut_all=False)
    seg_list = "\t".join(jieba_cut).split("\t")
    correct_sentence = ""
    for phrase in seg_list:
        correct_phrase = phrase
        #  check if item is a punctuation
        if phrase not in PUNCTUATION_LIST:
            # check if the phrase in our dict, if not then it is a misspelled phrase
            if phrase not in phrase_freq.keys():
                correct_phrase = auto_correct(phrase)
                if verbose:
                    print(phrase, correct_phrase)
        correct_sentence += correct_phrase
    return correct_sentence


if __name__ == '__main__':
    import os
    err_sent_1 = '机七学习是人工智能领遇最能体现智能的一个分知！'
    correct_sent = auto_correct_sentence(err_sent_1)
    print("original sentence:" + err_sent_1 + "\n==>\n" + "corrected sentence:" + correct_sent)

    error_phrase_1 = "呕涂"  # should be "呕吐"
    error_phrase_2 = "东方之朱"  # should be "东方之珠"
    error_phrase_3 = "启程安排"  # should be "沙龙"

    # print(error_phrase_1, auto_correct(error_phrase_1))
    # print(error_phrase_2, auto_correct(error_phrase_2))
    print(error_phrase_3, auto_correct(error_phrase_3, flag="all"))