from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime

class PromoBase(BaseModel):
    code: str = Field(..., min_length=3, max_length=64)
    reward_coins: int = Field(..., ge=1, le=1_000_000)
    max_uses: Optional[int] = Field(default=None, ge=1)  # None = бесконечно
    is_active: bool = True
    starts_at: Optional[datetime] = None
    ends_at: Optional[datetime] = None

class PromoCreate(PromoBase):
    pass

class PromoUpdate(BaseModel):
    reward_coins: Optional[int] = Field(default=None, ge=1, le=1_000_000)
    max_uses: Optional[int] = Field(default=None, ge=1)
    is_active: Optional[bool] = None
    starts_at: Optional[datetime] = None
    ends_at: Optional[datetime] = None

class PromoInDB(PromoBase):
    id: str
    uses_count: int
    created_at: datetime
    updated_at: datetime

class PromoRedeemResponse(BaseModel):
    code: str
    reward_coins: int
    new_balance: int