import string
import jieba
from tqdm import tqdm
import json
import numpy as np

stop_words = ['！', '……', '？', '的', '了', '嗯', '哦', '啊', '我', '你',
              '她', '他', '它', '在', '和', '吗', '呢', '可以', '，', '。',
              '：', '；']


def cut_sentence_by_word(sentence, stopwords):
    """
    按照单个字进行分词，需要处理单个英文字
    :param sentence:
    :param stopwords:
    :return:word_list
    """
    continue_words = string.ascii_lowercase + string.digits
    temp = ""
    result = []
    for word in sentence:
        if word in continue_words:
            temp += word
            continue
        if len(temp) > 0:
            result.append(temp)
            temp = ""
        result.append(word)
    if len(temp) > 0:
        result.append(temp)
    return [word for word in result if word not in stopwords]


def cut_sentence(sentence, stopwords):
    """
    按照词语进行分词
    :param sentence:
    :param stopwords:
    :return: words_list
    """
    return [word for word in jieba.lcut(sentence) if word not in stopwords]


def transfer_file_to_list(file_path):
    """

    :param file_path:
    :return:
    """
    with open(file_path, 'r', encoding='utf-8') as f:
        lines = [line.rstrip().lower() for line in f]
    return lines


class TxtToIndex(object):
    def __init__(self, train_txt_path, test_txt_path, cuf_fn):
        """
        初始化
        :param train_txt_path: 原始训练数据地址
        :param test_txt_path: 原始测试数据地址
        :param cuf_fn: 分割函数，可以按字或者词分割
        """
        self.cut_fn = cuf_fn
        self._origin_train_data = transfer_file_to_list(train_txt_path)
        self._origin_test_data = transfer_file_to_list(test_txt_path)
        self._labels = []
        self._vocab = {}  # {"汀": 0, "哟": 1}
        self._create_vocab_and_labels()

    def _create_vocab_and_labels(self):
        vocab_length = 0
        label_set = set()  # 去重
        for i in tqdm(range(0, len(self._origin_train_data)), desc='Initializing'):
            sentence, label = self._origin_train_data[i].rsplit(sep=' ', maxsplit=1)
            label_set.add(label)
            word_list = self.cut_fn(sentence, stop_words)
            for word in word_list:
                if not self._vocab.get(word):
                    self._vocab[word] = vocab_length
                    vocab_length += 1

        self._labels = list(label_set)
        # 异常保护，如果原文中带<unk>或<pad>则用原文中的值
        self._vocab['<unk>'] = vocab_length if not self._vocab.get('<unk>', None) else self._vocab.get('<unk>')
        self._vocab['<pad>'] = vocab_length + 1 if not self._vocab.get('<unk>', None) else self._vocab.get('<unk>')

    def save_labels(self, label_path):
        """
        包括所有标签
        :param label_path: 保存地址
        """
        with open(label_path, 'w', encoding='utf-8') as f:
            for label in self._labels:
                f.writelines(label + '\n')

    def save_vocabulary(self, vocab_path):
        """
        包括train和dev的字典
        :param vocab_path: 保存地址
        :return:
        """
        if not vocab_path.endswith('.json'):
            print('vocabulary should be a json file')
            return
        with open(vocab_path, 'w', encoding='utf-8') as f:
            json.dump(self._vocab, f, ensure_ascii=False)

    def _save_labeled_data(self, save_to, description, txt_data):
        if len(txt_data) == 0:
            return
        f = open(save_to, 'w', encoding='utf-8')
        for i in tqdm(range(0, len(txt_data)), desc=description):
            sentence, label = txt_data[i].rsplit(sep=' ', maxsplit=1)
            word_list = self.cut_fn(sentence, stop_words)
            label_idx = self._labels.index(label)
            sentence_idx = [str(self._vocab.get(word, self._vocab['<unk>'])) for word in word_list]
            f.writelines(' '.join(sentence_idx) + '\t' + str(label_idx) + '\n')
        f.close()

    def _save_non_labeled_data(self, save_to, description, txt_data):
        f = open(save_to, 'w', encoding='utf-8')
        for i in tqdm(range(0, len(txt_data)), desc=description):
            word_list = self.cut_fn(txt_data[i], stop_words)
            sentence_idx = list(map(str, [self._vocab.get(word, self._vocab['<unk>']) for word in word_list]))
            f.writelines(' '.join(sentence_idx) + '\n')
        f.close()

    def split_and_save(self, train_idx_path, dev_idx_path=None, frac=0.4):
        """
        将训练数据按比例分为训练集和数据集，并保存为索引
        :param train_idx_path: 训练集索引保存地址
        :param dev_idx_path: 验证集索引保存地址
        :param frac: 训练集和验证集比例
        :return:
        """
        if frac <= 0 or frac > 1:
            print('分割比例必须大于0 且小于等于1')
            return
        if frac < 1 and not dev_idx_path:
            print('分割比例小于1时，必须指定测试集路径')
            return
        if frac == 1 and dev_idx_path:
            print('分割比例等于1时全部数据均用作训练集,测试集路径{}无效'.format(dev_idx_path))

        np.random.shuffle(self._origin_train_data)  # 打乱数据，使每次保存的验证集和测试集均不同
        split_point = int(len(self._origin_train_data) * frac)
        self._save_labeled_data(train_idx_path, 'Saving Train Index', self._origin_train_data[:split_point])
        self._save_labeled_data(dev_idx_path, 'Saving Dev Index', self._origin_train_data[split_point:])

    def save_test_set(self, test_idx_path):
        """
        将测试数据保存为索引
        :param test_idx_path:
        """
        self._save_non_labeled_data(test_idx_path, 'Saving Test Index', self._origin_test_data)


if __name__ == '__main__':
    txt_to_idx = TxtToIndex(
        train_txt_path='data/myTrain.txt',
        test_txt_path='data/myTest.txt',
        cuf_fn=cut_sentence_by_word,
    )
    txt_to_idx.save_test_set('datatest/test_idx.txt')
    txt_to_idx.save_labels('datatest/labels.txt')
    txt_to_idx.save_vocabulary('datatest/vocab.json')
    txt_to_idx.split_and_save('datatest/train_idx.txt', 'datatest/dev_idx.txt', frac=0.6)