from auth import *
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.security import OAuth2PasswordRequestForm
from functions import *
import random
from sql import *
from tables import *

# fastapi init
app = FastAPI(lifespan=lifespan, redirect_slashes=False)

app.add_middleware(
  CORSMiddleware,
  allow_origins=["*"],
  allow_credentials=True,
  allow_methods=["*"],
  allow_headers=["*"],
)

# routes
@app.get("/")
async def root():
  return {"message": "Hello World"}

@app.post("/user/create", response_model=UserPublic)
def create_user(user: UserCreate, session: SessionDep):
    salt = random.randint(00000, 99999)
    existing_email = session.query(User).filter(User.email == user.email).first()
    if existing_email:
        return {"detail": "Email already registered"}
    existing_username = session.query(User).filter(User.username == user.username).first()
    if existing_username:
        return {"detail": "Username already registered"}

    user.password = hash_password(user.password, salt)
    user.salt = salt

    db_user = User.model_validate(user)
    session.add(db_user)
    session.commit()
    session.refresh(db_user)
    return db_user

# generated using Claude 3.5 Sonnet
@app.patch("/user/update-tasks", response_model=UserPublic)
async def update_user_task(task: UpdateTask, session: SessionDep, current_user: User = Depends(get_current_user)):
    user_db = session.get(User, current_user.id)
    user_data = task.model_dump(exclude_unset=True)
    new_task = user_data

    print(new_task['task_id']);

    if user_db.tasks is None:
        user_db.tasks = []

    # Create a copy of current tasks
    updated_tasks = user_db.tasks.copy()

    # Check if task_id exists in user_db tasks
    existing_task = next(
        (task for task in updated_tasks if task.get('task_id') == new_task.get('task_id')), 
        None
    )

    if existing_task:
        # Overwrite the existing task with the new task
        for i, task in enumerate(updated_tasks):
            if task['task_id'] == new_task['task_id']:
                updated_tasks[i] = new_task
                break
    else:
        # Generate new task_id if not provided
        if new_task.get('task_id') is None:
            new_task['task_id'] = len(updated_tasks)
        # Append the new task
        updated_tasks.append(new_task)

    # Update user_db tasks with the modified list
    user_db.tasks = updated_tasks

    # Update the session
    session.add(user_db)
    session.commit()
    session.refresh(user_db)
        
    return user_db

@app.delete("/user/delete-task", response_model=UserPublic)
async def delete_user_task(task: DeleteTask, session: SessionDep, current_user: User = Depends(get_current_user)):
    user_db = session.get(User, current_user.id)
    user_data = task.model_dump(exclude_unset=True)
    task_id = user_data['task_id']

    if user_db.tasks is None:
        return {"detail": "No tasks to delete"}

    # Create a copy of current tasks
    updated_tasks = user_db.tasks.copy()

    # Remove the task with the specified task_id
    updated_tasks = [task for task in updated_tasks if task.get('task_id') != task_id]

    # Update user_db tasks with the modified list
    user_db.tasks = updated_tasks

    # Update the session
    session.add(user_db)
    session.commit()
    session.refresh(user_db)

    return user_db

@app.patch("/user/update", response_model=UserPublic)
async def update_user(user: UserUpdate, session: SessionDep, current_user: User = Depends(get_current_user)):
    user_db = session.get(User, current_user.id)
    user_data = user.model_dump(exclude_unset=True)

    # Check if the password is being updated
    if 'password' in user_data:
        # Generate a new salt
        salt = random.randint(00000, 99999)
        # Hash the new password with the new salt
        user_data['password'] = hash_password(user_data['password'], salt)
        user_data['salt'] = salt

    user_db.sqlmodel_update(user_data)
    session.add(user_db)
    session.commit()
    session.refresh(user_db)
    return user_db

@app.post('/user/login')
async def verify_user(user: VerifyUser, session: SessionDep):
    existing_user = session.query(User).filter(User.username == user.username).first()
    if not existing_user:
        return {"detail": "User not found"}

    is_password_valid = validate_password(user.password, existing_user.password, existing_user.salt)

    if not is_password_valid:
        return {"detail": "Invalid password"}

    return {"detail": "Login successful"}


@app.post('/token', response_model=Token)
async def login_for_access_token(session: SessionDep, form_data: OAuth2PasswordRequestForm = Depends()):
    user = authenticate_user(form_data.username, form_data.password, session)
    if not user:
        raise HTTPException(status_code=401, detail="Incorrect username or password", headers={"WWW-Authenticate": "Bearer"})

    access_token_expires = timedelta(minutes=int(os.getenv("ACCESS_TOKEN_EXPIRES_MINUTES")))
    access_token = create_access_token(data={"sub": user.username}, expires_delta=access_token_expires)
    return {"access_token": access_token, "token_type": "bearer", "expires_days": access_token_expires.days}

@app.get("/users/me", response_model=UserPublic)
async def read_users_me(session: SessionDep, current_user: User = Depends(get_current_user)):
    return current_user