from datetime import datetime
from typing import Optional

from pydantic import BaseModel, Field

from app.models.task import TaskPriority, TaskStatus


class TaskBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = None
    priority: TaskPriority = TaskPriority.MEDIUM
    status: TaskStatus = TaskStatus.TODO
    due_date: Optional[datetime] = None
    completed: bool = False

    model_config = {
        "json_encoders": {
            datetime: lambda dt: dt.isoformat(),
        }
    }


class TaskCreate(TaskBase):
    pass


class TaskUpdate(BaseModel):
    title: Optional[str] = Field(None, min_length=1, max_length=100)
    description: Optional[str] = None
    priority: Optional[TaskPriority] = None
    status: Optional[TaskStatus] = None
    due_date: Optional[datetime] = None
    completed: Optional[bool] = None

    model_config = {
        "json_encoders": {
            datetime: lambda dt: dt.isoformat(),
        },
        "populate_by_name": True,
        "json_schema_extra": {
            "examples": [
                {
                    "title": "Updated Task Title",
                    "description": "Updated task description",
                    "priority": "high",
                    "status": "in_progress",
                    "completed": False,
                }
            ]
        },
    }


class TaskInDBBase(TaskBase):
    id: int
    created_at: datetime
    updated_at: datetime

    model_config = {"from_attributes": True}


class Task(TaskInDBBase):
    pass