import re
from typing import List, Optional, Type, get_args

from monty.json import MSONable
from pydantic import BaseModel
from pydantic.schema import get_flat_models_from_model
from pydantic.utils import lenient_issubclass


def validate_ids(id_list: List[str]):
    """Function to validate material and task IDs

    Args:
        id_list (List[str]): List of material or task IDs.

    Raises:
        ValueError: If at least one ID is not formatted correctly.

    Returns:
        id_list: Returns original ID list if everything is formatted correctly.
    """
    pattern = "(mp|mvc|mol)-.*"

    for entry in id_list:
        if re.match(pattern, entry) is None:
            raise ValueError(f"{entry} is not formatted correctly!")

    return id_list


def api_sanitize(
    pydantic_model: Type[BaseModel],
    fields_to_leave: Optional[List[str]] = None,
    allow_dict_msonable=False,
):
    """
    Function to clean up pydantic models for the API by:
        1.) Making fields optional
        2.) Allowing dictionaries in-place of the objects for MSONable quantities

    WARNING: This works in place, so it mutates the model and all sub-models

    Args:
        fields_to_leave: list of strings for model fields as "model__name__.field"
    """

    models = [
        model
        for model in get_flat_models_from_model(pydantic_model)
        if issubclass(model, BaseModel)
    ]  # type: List[Type[BaseModel]]

    fields_to_leave = fields_to_leave or []
    fields_tuples = [f.split(".") for f in fields_to_leave]
    assert all(len(f) == 2 for f in fields_tuples)

    for model in models:
        model_fields_to_leave = {f[1] for f in fields_tuples if model.__name__ == f[0]}
        for name, field in model.__fields__.items():
            field_type = field.type_

            if name not in model_fields_to_leave:
                field.required = False
                field.default = None
                field.default_factory = None
                field.allow_none = True
                field.field_info.default = None
                field.field_info.default_factory = None

            if field_type is not None and allow_dict_msonable:
                if lenient_issubclass(field_type, MSONable):
                    field.type_ = allow_msonable_dict(field_type)
                else:
                    for sub_type in get_args(field_type):
                        if lenient_issubclass(sub_type, MSONable):
                            allow_msonable_dict(sub_type)
                field.populate_validators()

    return pydantic_model


def allow_msonable_dict(monty_cls: Type[MSONable]):
    """
    Patch Monty to allow for dict values for MSONable
    """

    def validate_monty(cls, v):
        """
        Stub validator for MSONable as a dictionary only
        """
        if isinstance(v, cls):
            return v
        elif isinstance(v, dict):
            # Just validate the simple Monty Dict Model
            errors = []
            if v.get("@module", "") != monty_cls.__module__:
                errors.append("@module")

            if v.get("@class", "") != monty_cls.__name__:
                errors.append("@class")

            if len(errors) > 0:
                raise ValueError(
                    "Missing Monty seriailzation fields in dictionary: {errors}"
                )

            return v
        else:
            raise ValueError(f"Must provide {cls.__name__} or MSONable dictionary")

    setattr(monty_cls, "validate_monty", classmethod(validate_monty))

    return monty_cls