from fastapi import FastAPI, HTTPException, Depends
from sqlalchemy.orm import Session
from typing import List
from datetime import date

from models import Task, SessionLocal
from schemas import TaskCreate, TaskResponse

app = FastAPI()

# Dependency to get database session
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

@app.post("/tasks/", response_model=TaskResponse, status_code=201)
async def create_task(task: TaskCreate, db: Session = Depends(get_db)):
    db_task = Task(**task.model_dump())
    db.add(db_task)
    db.commit()
    db.refresh(db_task)
    return db_task

@app.get("/tasks/", response_model=List[TaskResponse])
async def read_tasks(status: str = None, db: Session = Depends(get_db)):
    if status:
        tasks = db.query(Task).filter_by(status=status).all()
    else:
        tasks = db.query(Task).all()
    return tasks

@app.get("/tasks/{task_id}", response_model=TaskResponse)
async def read_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.put("/tasks/{task_id}", response_model=TaskResponse)
async def update_task(task_id: int, task_update: TaskCreate, 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")
    
    for key, value in task_update.model_dump().items():
        setattr(task, key, value)
    
    db.commit()
    db.refresh(task)
    return task

@app.delete("/tasks/{task_id}", status_code=204)
async 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