import os

from pydantic import Field, ValidationError, computed_field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env")

    postgres_user: str = Field()
    postgres_password: str = Field()
    postgres_host: str = Field()
    postgres_port: str = Field()
    postgres_db: str = Field()

    private_key_fp: str = Field()
    public_key_fp: str = Field()

    @computed_field
    @property
    def db_url(self) -> str:
        return f"postgresql+asyncpg://{self.postgres_user}:{self.postgres_password}@{self.postgres_host}:{self.postgres_port}/{self.postgres_db}"

    @computed_field
    @property
    def private_key(self) -> bytes:
        if not os.path.isfile(self.private_key_fp):
            raise ValidationError("Private key is not found")
        with open(self.private_key_fp, "rb") as f:
            return f.read()

    @computed_field
    @property
    def public_key(self) -> bytes:
        if not os.path.isfile(self.public_key_fp):
            raise ValidationError("Public key is not found")
        with open(self.public_key_fp, "rb") as f:
            return f.read()


cfg = Settings()  # type: ignore