import os
import numpy as np
import json
import struct

import logging
log = logging.getLogger(__name__)


class Fio:
    r"""Basic class for FIO
    """
    def __init__(self):
        pass

    def exits(self, file_name=''):
        if file_name == '':
            return True
        return os.path.exists(file_name)

    def mkdir(self, path_name=''):
        if not self.exits(path_name):
            os.makedirs(path_name)

    def create_file_path(self, file_name=''):
        pars = file_name.split('/')
        if len(pars) > 0:
            path_name = '/'.join(pars[:-1])
            self.mkdir(path_name)

    def is_path(self, path):
        return self.exits(path) and os.path.isdir(path)

    def is_file(self, file_name):
        return self.exits(file_name) and os.path.isfile(file_name)

    def get_file_list(self, path) -> list:
        if self.is_file(path):
            return []
        if self.is_path:
            listdir = os.listdir(path)
            file_lst = []
            for name in listdir:
                if self.is_file(os.path.join(path, name)):
                    file_lst.append(os.path.join(path, name))
                else:
                    file_lst_ = self.get_file_list(os.path.join(path, name))
                    file_lst.extend(file_lst_)
            return file_lst
        return []


class FioDic:
    r"""Input and output for dict class data
    the file can be .json or .npy file containing a dictionary
    """
    def __init__(self) -> None:
        pass

    def load(self, file_name='', default_value={}):
        if file_name.endswith('.json'):
            return FioJsonDic().load(file_name, default_value)
        elif file_name.endswith('.npy'):
            return FioNpyDic().load(file_name, default_value)
        else:
            return FioNpyDic().load(file_name, default_value)

    def save(self, file_name='', dic={}):
        if file_name.endswith('.json'):
            FioJsonDic().save(file_name, dic)
        elif file_name.endswith('.npy'):
            FioNpyDic().save(file_name, dic)
        else:
            FioNpyDic().save(file_name, dic)

    def get(self, jdata, key, default_value):
        if key in jdata.keys():
            return jdata[key]
        else:
            return default_value

    def update(self, jdata, jdata_o):
        r"""Update key-value pair is key in jdata_o.keys()

        Parameter
        =========
        jdata
            new jdata
        jdata_o
            origin jdata
        """
        for key in jdata.keys():
            if key in jdata_o.keys():
                if isinstance(jdata_o[key], dict):
                    jdata_o[key] = self.update(jdata[key], jdata_o[key])
                else:
                    jdata_o[key] = jdata[key]
        return jdata_o


class FioNpyDic:
    r"""Input and output for .npy file containing dictionary
    """
    def __init__(self):
        pass

    def load(self, file_name='', default_value={}):
        if Fio().exits(file_name):
            log.info(f"load {file_name}")
            dat = np.load(file_name, allow_pickle=True)[0]
            return dat
        else:
            log.warning(f"can not find {file_name}")
            return default_value

    def save(self, file_name='', dic={}):
        Fio().create_file_path(file_name)
        np.save(file_name, [dic])


class FioJsonDic:
    r"""Input and output for .json file containing dictionary
    """
    def __init__(self):
        pass

    def load(self, file_name='', default_value={}):
        r"""Load .json file into dict
        """
        if Fio().exits(file_name):
            log.info(f"load {file_name}")
            with open(file_name, 'r') as fr:
                jdata = fr.read()
            dat = json.loads(jdata)
            return dat
        else:
            log.warning(f"can not find {file_name}")
            return default_value

    def save(self, file_name='', dic={}):
        r"""Save dict into .json file
        """
        log.info(f"write jdata to {file_name}")
        Fio().create_file_path(file_name)
        with open(file_name, 'w') as fw:
            json.dump(dic, fw, indent=4)


class FioBin():
    r"""Input and output for binary file
    """
    def __init__(self):
        pass

    def load(self, file_name='', default_value=''):
        r"""Load binary file into bytes value
        """
        if Fio().exits(file_name):
            log.info(f"load {file_name}")
            dat = ""
            with open(file_name, 'rb') as fr:
                dat = fr.read()
            return dat
        else:
            log.warning(f"can not find {file_name}")
            return default_value

    def save(self, file_name: str = '', data: str = ''):
        r"""Save hex string into binary file
        """
        log.info(f"write binary to {file_name}")
        Fio().create_file_path(file_name)
        with open(file_name, 'wb') as fp:
            for si in data:
                # one byte consists of two hex chars
                for ii in range(len(si) // 2):
                    v = int(si[2 * ii: 2 * (ii + 1)], 16)
                    v = struct.pack('B', v)
                    fp.write(v)


class FioTxt():
    r"""Input and output for .txt file with string
    """
    def __init__(self):
        pass

    def load(self, file_name='', default_value=[]):
        r"""Load .txt file into string list
        """
        if Fio().exits(file_name):
            log.info(f"load {file_name}")
            with open(file_name, 'r', encoding='utf-8') as fr:
                dat = fr.readlines()
            dat = [d.replace('\n', '') for d in dat]
            return dat
        else:
            log.info(f"can not find {file_name}")
            return default_value

    def save(self, file_name: str = '', data: list = []):
        r"""Save string list into .txt file
        """
        log.info(f"write string to txt file {file_name}")
        Fio().create_file_path(file_name)

        if isinstance(data, str):
            data = [data]
        data = [d + '\n' for d in data]
        with open(file_name, 'w') as fw:
            fw.writelines(data)