import copy
import dataclasses
import enum
import sys
from typing import Any, Dict, Mapping, Type, TypeVar, get_args, get_origin, get_type_hints

import yaml


ConfigT = TypeVar("ConfigT", bound="Config")


class Config:
    def __init__(self, **kwargs: Any):
        annotations = _collect_annotations(type(self))
        for key, annotation in annotations.items():
            if key in kwargs:
                value = kwargs[key]
            elif hasattr(type(self), key):
                value = copy.deepcopy(getattr(type(self), key))
            else:
                continue
            setattr(self, key, _convert_value(annotation, value))

        for key, value in kwargs.items():
            if key not in annotations:
                setattr(self, key, value)

        if not hasattr(self, "pretrain_config"):
            self.pretrain_config = EmptyConfig()
        self.__post_init__()

    def __post_init__(self):
        return

    @property
    def empty(self) -> bool:
        return len(self.__dict__) == 0

    def as_json(self) -> Dict[str, Any]:
        return {
            key: _to_json(value)
            for key, value in self.__dict__.items()
            if key != "pretrain_config"
        }

    @classmethod
    def from_dict(cls: Type[ConfigT], data: Mapping[str, Any]) -> ConfigT:
        return cls(**dict(data))

    @classmethod
    def from_yaml(cls: Type[ConfigT], file_path: str) -> ConfigT:
        with open(file_path, "r") as file:
            data = yaml.safe_load(file)
        if data is None:
            data = {}
        return cls.from_dict(data)


class EmptyConfig(Config):
    def __init__(self, **kwargs: Any):
        self.__dict__.update(kwargs)


class Configurable:
    ConfigT = Any

    def __init__(self, config: Any):
        self.config = config

    @classmethod
    def __class_getitem__(cls, _):
        return cls


class Template:
    ConfigT = Any

    @classmethod
    def __class_getitem__(cls, _):
        return cls


def _collect_annotations(cls: Type[Any]) -> Dict[str, Any]:
    annotations: Dict[str, Any] = {}
    for base in reversed(cls.__mro__):
        if base is object:
            continue
        module = sys.modules.get(base.__module__)
        module_globals = vars(module) if module is not None else {}
        try:
            hints = get_type_hints(base, globalns=module_globals, localns=module_globals)
        except Exception:
            hints = getattr(base, "__annotations__", {})
        annotations.update(hints)
    return annotations


def _is_config_type(annotation: Any) -> bool:
    return isinstance(annotation, type) and issubclass(annotation, Config)


def _convert_value(annotation: Any, value: Any) -> Any:
    if value is None:
        return None

    origin = get_origin(annotation)
    args = get_args(annotation)

    if _is_config_type(annotation) and isinstance(value, annotation):
        return value

    if _is_config_type(annotation) and isinstance(value, Mapping):
        return annotation(**value)

    if isinstance(annotation, type) and issubclass(annotation, enum.Enum) and not isinstance(value, annotation):
        return annotation(value)

    if origin is None:
        return value

    if origin in (list, tuple):
        item_type = args[0] if len(args) > 0 else Any
        converted = [_convert_value(item_type, item) for item in value]
        return converted if origin is list else tuple(converted)

    if origin is dict:
        key_type = args[0] if len(args) > 0 else Any
        val_type = args[1] if len(args) > 1 else Any
        return {
            _convert_value(key_type, key): _convert_value(val_type, item)
            for key, item in value.items()
        }

    if str(origin) in {"typing.Union", "types.UnionType"}:
        non_none_args = [arg for arg in args if arg is not type(None)]
        for arg in non_none_args:
            try:
                return _convert_value(arg, value)
            except Exception:
                continue
        return value

    return value


def _to_json(value: Any) -> Any:
    if isinstance(value, Config):
        return value.as_json()
    if isinstance(value, enum.Enum):
        return value.value
    if dataclasses.is_dataclass(value):
        return dataclasses.asdict(value)
    if isinstance(value, dict):
        return {key: _to_json(item) for key, item in value.items()}
    if isinstance(value, list):
        return [_to_json(item) for item in value]
    if isinstance(value, tuple):
        return [_to_json(item) for item in value]
    return value