"""
Pydantic schemas for Todo
"""
from datetime import datetime

from pydantic import BaseModel, Field


class TodoBase(BaseModel):
    """
    Base Todo schema with shared attributes
    """
    title: str = Field(..., min_length=1, max_length=255, description="The title of the todo item")
    description: str | None = Field(None, description="Optional detailed description of the todo item")
    completed: bool = Field(False, description="Whether the todo item is completed")


class TodoCreate(TodoBase):
    """
    Schema for creating a new Todo
    """
    pass


class TodoUpdate(BaseModel):
    """
    Schema for updating an existing Todo
    """
    title: str | None = Field(None, min_length=1, max_length=255, description="The title of the todo item")
    description: str | None = Field(None, description="Optional detailed description of the todo item")
    completed: bool | None = Field(None, description="Whether the todo item is completed")


class TodoInDB(TodoBase):
    """
    Schema for Todo as stored in the database
    """
    id: int
    created_at: datetime
    updated_at: datetime

    class Config:
        """
        Pydantic configuration
        """
        from_attributes = True
        json_encoders = {
            datetime: lambda v: v.isoformat()
        }


class Todo(TodoInDB):
    """
    Schema for Todo response
    """
    pass