main.py

"""
Task Manager REST API
=======================
A small FastAPI service for creating, reading, updating, and deleting tasks,
backed by SQLite via SQLAlchemy.

Run locally with:
    uvicorn main:app --reload

Then open http://127.0.0.1:8000/docs for interactive API docs.
"""
from typing import List, Optional

from fastapi import Depends, FastAPI, HTTPException
from sqlalchemy.orm import Session

from database import Base, engine, get_db
from models import Task, TaskCreate, TaskOut, TaskUpdate

Base.metadata.create_all(bind=engine)

app = FastAPI(
    title="Task Manager API",
    description="A simple REST API for managing personal tasks.",
    version="1.0.0",
)


@app.get("/", tags=["meta"])
def root():
    return {"message": "Task Manager API. See /docs for interactive API docs."}


@app.post("/tasks", response_model=TaskOut, status_code=201, tags=["tasks"])
def create_task(task: TaskCreate, db: Session = Depends(get_db)):
    db_task = Task(title=task.title, description=task.description, status=task.status.value)
    db.add(db_task)
    db.commit()
    db.refresh(db_task)
    return db_task


@app.get("/tasks", response_model=List[TaskOut], tags=["tasks"])
def list_tasks(status: Optional[str] = None, db: Session = Depends(get_db)):
    query = db.query(Task)
    if status:
        query = query.filter(Task.status == status)
    return query.order_by(Task.created_at.desc()).all()


@app.get("/tasks/{task_id}", response_model=TaskOut, tags=["tasks"])
def get_task(task_id: int, db: Session = Depends(get_db)):
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    return task


@app.patch("/tasks/{task_id}", response_model=TaskOut, tags=["tasks"])
def update_task(task_id: int, update: TaskUpdate, db: Session = Depends(get_db)):
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    if update.title is not None:
        task.title = update.title
    if update.description is not None:
        task.description = update.description
    if update.status is not None:
        task.status = update.status.value
    db.commit()
    db.refresh(task)
    return task


@app.delete("/tasks/{task_id}", status_code=204, tags=["tasks"])
def delete_task(task_id: int, db: Session = Depends(get_db)):
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    db.delete(task)
    db.commit()
    return None