from __future__ import annotations
import json
from pathlib import Path
from typing import Dict, Optional, Union

import yaml


def clean_dict(dictionary: Dict) -> Optional[Dict]:
    aux = {
              k: clean_dict(v) for k, v in dictionary.items() if type(v) == dict
          } | {
              k: v for k, v in dictionary.items() if type(v) != dict
          }
    aux2 = {
        k: v for k, v in aux.items() if v is not None
    }
    return aux2 if aux2 != {} else None


class Config:
    def merge_with(self, other: Config, strict: bool = False):
        """
        Merges the other config into this one
        :param other:
        :param strict: whether conflicting options are allowed or not
        :return: self
        """
        for var in vars(self):
            if not getattr(self, var):
                setattr(self, var, getattr(other, var))
            else:
                if strict and getattr(other, var) is not None and getattr(self, var) != getattr(other, var):
                    raise NotImplementedError
        return self

    @classmethod
    def from_json(cls, content: Union[Path, Dict]):
        if isinstance(content, Path):
            with open(content, 'r') as file:
                json_content: Dict = json.load(file)
        else:
            json_content = content
        config = cls()
        config.set_from_json(json_content)
        return config


    @classmethod
    def from_yaml(cls, content: Union[Path, str]):
        if isinstance(content, Path):
            with open(content, 'r') as file:
                json_content: Dict = yaml.safe_load(file)
        else:
            json_content = yaml.safe_load(content)
        return cls.from_json(json_content)

    def set_from_json(self, content: Optional[Dict]):
        raise NotImplementedError

    def to_json(self) -> Dict:
        raise NotImplementedError

    def dump_as_yaml(self, filename: Path, clean_none_entries: bool = True):
        with filename.open('w') as file:
            if clean_none_entries:
                simple_dict = clean_dict(self.to_json())
            else:
                simple_dict = self.to_json()
            if simple_dict is not None:
                yaml.dump(simple_dict, file)
            else:
                pass  # TODO

    def dump_as_json(self, filename: Path, clean_none_entries: bool = True):
        with open(filename, 'w') as config:
            if clean_none_entries:
                simple_dict = clean_dict(self.to_json())
            else:
                simple_dict = self.to_json()
            if simple_dict is not None:
                json.dump(simple_dict, config)
            else:
                pass  # TODO

    @classmethod
    def _fill_keys(cls, dictionary: Optional[Dict]):
        if dictionary is None:
            return cls().to_json()
        else:
            return recursive_merge_dictionaries(
                cls().to_json(),
                dictionary
            )


def recursive_merge_dictionaries(dict1: Dict, dict2: Dict) -> Dict:
    aux1 = {
        k: v for k, v in dict1.items() if type(v) == dict
    }
    aux2 = {
        k: v for k, v in dict2.items() if type(v) == dict
    }
    merged = {
        k: recursive_merge_dictionaries(v, aux2[k]) for k, v in aux1.items() if k in aux2.keys()
    }
    return dict1 | dict2 | merged