main.py

from fastapi import FastAPI, Request, HTTPException
app = FastAPI()

tasks = [
    {
        "id": 1,
        "title": "Task 0",
        "done": True
    },
    {
        "id": 2,
        "title": "Task 1",
        "done" : True
    },
    {
        "id": 3,
        "title": "Task 2",
        "done" : False
    }
]

###############################################################################
@app.get("/", summary="API information")
async def root():
    return {"name": "Task API", "version": "1.0", "endpoints": ["/tasks"] }

@app.get("/health",summary="Check API health")
async def health():
    return {"status": "ok"}
###############################################################################

###############################################################################
@app.get("/tasks", summary="Get all tasks")
async def get_tasks():
    return tasks

@app.get("/tasks/{id}", summary="Get task by ID")
async def get_task_by_id(id: int):
    for task in tasks:
        if task["id"] == id:
            return task
    return {"error": f"Task {id} not found"}

###############################################################################

@app.post("/tasks", status_code=201, summary="Create a new task")
async def create_task(req: Request):

    try:
        task = await req.json()
    except:
        raise HTTPException(
            status_code=400,
            detail="Invalid JSON"
        )

    if "title" not in task:
        raise HTTPException(
            status_code=400,
            detail="Title is required"
        )

    if task["title"].strip() == "":
        raise HTTPException(
            status_code=400,
            detail="Title cannot be empty"
        )

    new_task = {
        "id": len(tasks) + 1,
        "title": task["title"],
        "done": False
    }

    tasks.append(new_task)

    return new_task

###############################################################################

@app.put("/tasks/{id}", summary="Update a task")
async def update_task(id: int, req: Request):

    task = None
    for t in tasks:
        if t["id"] == id:
            task = t
            break

    if task is None:
        raise HTTPException(
            status_code=404,
            detail=f"Task {id} not found"
        )

    try:
        data = await req.json()
    except:
        raise HTTPException(
            status_code=400,
            detail="Invalid JSON"
        )

    if not data:
        raise HTTPException(
            status_code=400,
            detail="Request body cannot be empty"
        )

    if "title" in data:
        if data["title"].strip() == "":
            raise HTTPException(
                status_code=400,
                detail="Title cannot be empty"
            )
        task["title"] = data["title"]

    if "done" in data:
        task["done"] = data["done"]

    return task


    from fastapi import Response

@app.delete("/tasks/{id}", status_code=204, summary="Delete a task")
async def delete_task(id: int):

    for task in tasks:
        if task["id"] == id:
            tasks.remove(task)
            return Response(status_code=204)

    raise HTTPException(
        status_code=404,
        detail=f"Task {id} not found"
    )