""" Base emmet model to add default metadata """
from datetime import datetime
from typing import TypeVar

from pydantic import BaseModel, Field, validator
from pymatgen.core import __version__ as pmg_version
from monty.json import MontyDecoder

from emmet.core import __version__

T = TypeVar("T", bound="EmmetBaseModel")

monty_decoder = MontyDecoder()


class EmmetMeta(BaseModel):
    """
    Default emmet metadata
    """

    emmet_version: str = Field(__version__, description="The version of emmet this document was built with.")
    pymatgen_version: str = Field(pmg_version, description="The version of pymatgen this document was built with.")

    pull_request: int = Field(None, description="The pull request number associated with this data build.")

    database_version: str = Field(None, description="The database version for the built data.")

    build_date: datetime = Field(
        default_factory=datetime.utcnow,
        description="The build date for this document.",
    )

    # Make sure that the datetime field is properly formatted
    @validator("build_date", pre=True)
    def build_date_dict_ok(cls, v):
        return monty_decoder.process_decoded(v)


class EmmetBaseModel(BaseModel):
    """
    Base Model for default emmet data
    """

    builder_meta: EmmetMeta = Field(default_factory=EmmetMeta, description="Builder metadata.")