from pydantic import BaseModel, ConfigDict, field_validator
from datetime import datetime


class SettingsCreate(BaseModel):
    pin: str

    @field_validator('pin')
    @classmethod
    def pin_min_length(cls, v: str) -> str:
        if len(v) < 4:
            raise ValueError('PIN must be at least 4 characters')
        return v


class SettingsUpdate(BaseModel):
    accent_color: str | None = None
    upcoming_days: int | None = None


class SettingsResponse(BaseModel):
    id: int
    accent_color: str
    upcoming_days: int
    created_at: datetime
    updated_at: datetime

    model_config = ConfigDict(from_attributes=True)


class ChangePinRequest(BaseModel):
    old_pin: str
    new_pin: str

    @field_validator('new_pin')
    @classmethod
    def new_pin_min_length(cls, v: str) -> str:
        if len(v) < 4:
            raise ValueError('New PIN must be at least 4 characters')
        return v