from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field

from app.models.task import TaskPriority, TaskStatus


class TaskBase(BaseModel):
    """Base schema for Task."""

    title: str = Field(..., min_length=1, max_length=255)
    description: Optional[str] = None
    status: TaskStatus = TaskStatus.TODO
    priority: TaskPriority = TaskPriority.MEDIUM
    due_date: Optional[datetime] = None


class TaskCreate(TaskBase):
    """Schema for creating a Task."""

    pass


class TaskUpdate(BaseModel):
    """Schema for updating a Task."""

    title: Optional[str] = Field(None, min_length=1, max_length=255)
    description: Optional[str] = None
    status: Optional[TaskStatus] = None
    priority: Optional[TaskPriority] = None
    due_date: Optional[datetime] = None


class TaskInDBBase(TaskBase):
    """Base schema for Task stored in DB."""

    id: int
    created_at: datetime
    updated_at: datetime

    class Config:
        from_attributes = True


class Task(TaskInDBBase):
    """Schema for Task output."""

    pass