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

from app.models.todo import Priority

if TYPE_CHECKING:
    from app.schemas.category import Category
    from app.schemas.project import Project


class TodoBase(BaseModel):
    title: str
    description: Optional[str] = None
    completed: bool = False
    priority: Priority = Priority.MEDIUM
    category_id: Optional[int] = None


class TodoCreate(TodoBase):
    pass


class TodoUpdate(BaseModel):
    title: Optional[str] = None
    description: Optional[str] = None
    completed: Optional[bool] = None
    priority: Optional[Priority] = None
    category_id: Optional[int] = None


# Forward declaration to handle circular reference
class Todo(TodoBase):
    id: int
    created_at: datetime
    updated_at: Optional[datetime] = None
    category: Optional["Category"] = None

    class Config:
        from_attributes = True


class TodoListResponse(BaseModel):
    items: list[Todo]
    total: int
    page: int
    per_page: int
    has_next: bool
    has_prev: bool


# Update forward references
Todo.model_rebuild()