#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
@File    :   utils.py
@Time    :   2024/06/16 08:05:08
@Author  :   不要葱姜蒜
@Version :   1.0
@Desc    :   None
'''

import os
from typing import Dict, List, Optional, Tuple, Union

from tqdm import tqdm
import tiktoken
import re

enc = tiktoken.get_encoding("cl100k_base")

class ReadFiles:
    """
    class to read files
    """

    def __init__(self, path: str) -> None:
        self._path = path

    def get_content(self, max_token_len: int = 300, cover_content: int = 50):
        # 读取文件内容
        content = self.read_file_content(self._path)
        chunk_content = self.get_chunk(
            content, max_token_len=max_token_len, cover_content=cover_content)
        return chunk_content
    
    @classmethod
    def get_chunk(cls, text: str, max_token_len: int = 600, cover_content: int = 150):
        chunk_text = []

        curr_len = 0
        curr_chunk = ''

        token_len = max_token_len - cover_content
        lines = text.splitlines()  # 假设以换行符分割文本为行

        for line in lines:
            line = line.replace(' ', '')
            line_len = len(enc.encode(line))
            if line_len > max_token_len:
                # 如果单行长度就超过限制，则将其分割成多个块
                num_chunks = (line_len + token_len - 1) // token_len
                for i in range(num_chunks):
                    start = i * token_len
                    end = start + token_len
                    # 避免跨单词分割
                    while not line[start:end].rstrip().isspace():
                        start += 1
                        end += 1
                        if start >= line_len:
                            break
                    curr_chunk = (curr_chunk[-cover_content:] if cover_content > 0 else '') + line[start:end]
                    chunk_text.append(curr_chunk)
                
            if curr_len + line_len <= token_len:
                curr_chunk += line
                curr_chunk += '\n'
                curr_len += line_len
                curr_len += 1
            else:
                chunk_text.append(curr_chunk)
                curr_chunk = curr_chunk[-cover_content:] + line if cover_content > 0 else line
                curr_len = line_len + (cover_content if cover_content > 0 else 0)

        if curr_chunk:
            chunk_text.append(curr_chunk)

        return chunk_text
    
    @classmethod
    def read_file_content(cls, file_path: str):
        # 根据文件扩展名选择读取方法
        if file_path.endswith('.txt'):
            return cls.read_text(file_path)
        else:
            raise ValueError("Unsupported file type")
        
    @classmethod
    def read_text(cls, file_path: str):
        # 读取文本文件
        with open(file_path, 'r', encoding='utf-8') as file:
            return file.read()