import json

class BrailleConverter:
    def __init__(self, path_prefix="./src/utils/"):
        self.path_prefix = path_prefix
        self.map_files = {
            "alpha": "alpha_map.json",
            "number": "number_map.json"
        }
        self.current_map = "alpha"  # 初始为字母表
        self.load_map(self.current_map)
        self.switch_character = "001111"  # 假设 "⠼" 为切换到数字表的标记符
        self.remaining_number_mode_count = 0  # 用于跟踪在数字模式下的剩余字符数

    def load_map(self, type_map: str):
        """加载对应的映射表"""
        if type_map not in self.map_files:
            raise ValueError(f"Unsupported type_map '{type_map}'. Available options: {list(self.map_files.keys())}")
        map_file_path = self.path_prefix + self.map_files[type_map]
        with open(map_file_path, "r") as fl:
            self.data = json.load(fl)

    def convert_to_braille_unicode(self, str_input: str) -> str:
        """将输入字符串转换为盲文 Unicode"""
        # 如果遇到数字切换标记符，进入数字模式并将计数器设置为2
        if str_input == self.switch_character:
            self.current_map = "number"
            self.load_map(self.current_map)
            self.remaining_number_mode_count = 1
            return "floor"  # 不输出标记符

        # 使用当前映射表转换字符
        str_output = self.data.get(str_input, "")

        # 如果当前表是数字表，则减少计数器
        if self.current_map == "number":
            self.remaining_number_mode_count -= 1

            # 如果计数器为0，则切回字母表
            if self.remaining_number_mode_count == 0:
                self.current_map = "alpha"
                self.load_map(self.current_map)

        return str_output