from pydantic import BaseModel, EmailStr, Field
from typing import List, Optional
from datetime import datetime, timedelta
from zoneinfo import ZoneInfo # For timezone handling

# Define Pakistan Standard Time (PKT)
PKT = ZoneInfo("Asia/Karachi")

class UserBase(BaseModel):
    full_name: str
    phone_number: str
    email: EmailStr

class UserCreate(UserBase):
    password: str

class UserInDB(UserBase):
    id: str = Field(default_factory=str, alias="_id")
    hashed_password: Optional[str] = None
    google_id: Optional[str] = None
    is_verified: bool = False
    # slots: List[str] = [] # Removed slot system
    
    # Subscription fields
    subscription_status: str = "trial" # trial, active, expired, pending_approval
    subscription_plan: str = "free_trial" # free_trial, monthly, yearly
    trial_start_date: datetime = Field(default_factory=lambda: datetime.now(PKT))
    trial_end_time: datetime = Field(default_factory=lambda: datetime.now(PKT) + timedelta(days=1)) # Set trial to expire in 1 day for testing
    subscription_end_date: Optional[datetime] = None
    transaction_id: Optional[str] = None
    device_id: Optional[str] = None

    
    created_at: datetime = Field(default_factory=lambda: datetime.now(PKT))
    updated_at: datetime = Field(default_factory=lambda: datetime.now(PKT))

class UserPublic(UserBase):
    id: str
    is_verified: bool
    # slots: List[str]
    subscription_status: Optional[str] = "trial"
    subscription_plan: Optional[str] = "free_trial"
    trial_start_date: Optional[datetime] = None
    trial_end_time: Optional[datetime] = None
    device_id: Optional[str] = None
    created_at: datetime

    updated_at: datetime # Added for completeness, if needed by frontend