"""
Pydantic schemas for Task API.
Defines request and response models for task operations.
"""
from datetime import datetime
from typing import Optional, Any
from pydantic import BaseModel, Field


class TaskCreate(BaseModel):
    """Schema for creating a new task."""
    
    project_id: str = Field(..., min_length=1, description="Project ID this task belongs to")
    name: str = Field(..., min_length=1, description="Task name")
    data: dict = Field(..., description="Task data (JSON object)")
    assigned_to: Optional[str] = Field(None, description="User ID assigned to this task")
    
    class Config:
        json_schema_extra = {
            "example": {
                "project_id": "proj_123abc",
                "name": "Annotate Image Batch 1",
                "data": {
                    "image_url": "https://example.com/image1.jpg",
                    "metadata": {"batch": 1}
                },
                "assigned_to": "user_001"
            }
        }


class TaskUpdate(BaseModel):
    """Schema for updating an existing task."""
    
    name: Optional[str] = Field(None, min_length=1, description="Task name")
    data: Optional[dict] = Field(None, description="Task data (JSON object)")
    status: Optional[str] = Field(None, description="Task status (pending, in_progress, completed)")
    assigned_to: Optional[str] = Field(None, description="User ID assigned to this task")
    
    class Config:
        json_schema_extra = {
            "example": {
                "name": "Updated Task Name",
                "status": "in_progress",
                "assigned_to": "user_002"
            }
        }


class TaskResponse(BaseModel):
    """Schema for task response."""
    
    id: str = Field(..., description="Task unique identifier")
    project_id: str = Field(..., description="Project ID this task belongs to")
    name: str = Field(..., description="Task name")
    data: dict = Field(..., description="Task data (JSON object)")
    status: str = Field(..., description="Task status (pending, in_progress, completed)")
    assigned_to: Optional[str] = Field(None, description="User ID assigned to this task")
    created_at: datetime = Field(..., description="Task creation timestamp")
    progress: float = Field(default=0.0, description="Task completion progress (0.0 to 1.0)")
    
    class Config:
        json_schema_extra = {
            "example": {
                "id": "task_456def",
                "project_id": "proj_123abc",
                "name": "Annotate Image Batch 1",
                "data": {
                    "image_url": "https://example.com/image1.jpg",
                    "metadata": {"batch": 1}
                },
                "status": "in_progress",
                "assigned_to": "user_001",
                "created_at": "2024-01-12T11:00:00",
                "progress": 0.5
            }
        }