"""
历史K线管理
"""
import datetime
import os

import constant


class HistoryKDataManager:
    __instance = None
    __db = 0

    def __new__(cls, *args, **kwargs):
        if not cls.__instance:
            cls.__instance = super(HistoryKDataManager, cls).__new__(cls, *args, **kwargs)
            cls.__load_data()
        return cls.__instance

    @classmethod
    def __load_data(cls):
        pass

    def __get_cache_dir(self):
        """
        获取缓存路径
        @return:
        """
        dir_path = f"{constant.get_path_prefix()}/datas/k_bars"
        if not os.path.exists(dir_path):
            os.makedirs(dir_path)
        return dir_path

    def __del_outdate_datas(self, code):
        dir_path = self.__get_cache_dir()
        datas = []
        for root, dirs, files in os.walk(dir_path):
            for file in files:
                # 输出文件的绝对路径
                if file.find(code) < 0:
                    continue
                path_ = os.path.join(root, file)
                day = file.split("_")[0]
                datas.append((day, path_))
        # 保存最新的一条数据
        if datas:
            datas.sort(key=lambda x: int(x[0].replace("-", "")), reverse=True)
            datas = datas[1:]
            for d in datas:
                os.remove(d[1])

    def save_history_bars(self, code, day, datas, force=False):
        """
        保存历史K线
        @param code: 代码
        @param day: K线最新的日期（取datas最新一条数据的日期）
        @param datas: 数据
        @return:
        """
        cache_dir = self.__get_cache_dir()
        file_name = f"{day}_{code}.txt"
        path_str = f"{cache_dir}/{file_name}"
        if os.path.exists(path_str) and not force:
            return
        if datas:
            # 将日期格式化
            for d in datas:
                for k in d:
                    if type(d[k]) == datetime.datetime:
                        d[k] = d[k].strftime("%Y-%m-%d %H:%M:%S")

        with open(path_str, encoding="utf-8", mode='w') as f:
            f.write(f"{datas}")
        self.__del_outdate_datas(code)

    def get_history_bars(self, code, day):
        """
        获取历史K线
        @param code:
        @param day:
        @return:
        """
        cache_dir = self.__get_cache_dir()
        file_name = f"{day}_{code}.txt"
        path_str = f"{cache_dir}/{file_name}"
        if not os.path.exists(path_str):
            return None
        with open(path_str, encoding="utf-8", mode='r') as f:
            line = f.readline()
            if line:
                datas = eval(line)
                # 将日期格式转为datetime
                for d in datas:
                    for k in d:
                        if type(d[k]) == str and d[k].find("-") > 0 and d[k].find(":") > 0 and d[k].find(" ") > 0:
                            d[k] = datetime.datetime.strptime(d[k], "%Y-%m-%d %H:%M:%S")
                return datas
        return None

    def get_history_bars_code_count(self, day):
        """
        获取某一天的历史K线的数量
        @param day:
        @return:
        """
        dir_path = self.__get_cache_dir()
        count = 0
        for root, dirs, files in os.walk(dir_path):
            for file in files:
                # 输出文件的绝对路径
                if file.find(day) >= 0:
                    count += 1
        return count