from typing import Literal, Optional

from pydantic import BaseModel, Field, model_validator


class DocumentInput(BaseModel):
    client_name: str = Field(..., min_length=1)
    provider_name: str = Field(..., min_length=1)

    payment_type: Literal["hourly", "fixed", "other"]

    hourly_rate_gbp: Optional[float] = Field(None, gt=0)
    fixed_fee_gbp: Optional[float] = Field(None, gt=0)

    include_confidentiality: bool = False
    governing_law: str

    @model_validator(mode="after")
    def check_payment_fields(self):
        # enforce conditional reqs cleanly
        if self.payment_type == "hourly" and self.hourly_rate_gbp is None:
            raise ValueError("hourly_rate_gbp is required when payment_type is 'hourly'")

        if self.payment_type == "fixed" and self.fixed_fee_gbp is None:
            raise ValueError("fixed_fee_gbp is required when payment_type is 'fixed'")

        return self