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

from database import get_db
from models import User, UserCreate, UserUpdate, UserResponse, PasswordReset
from auth import hash_password, get_current_admin

router = APIRouter(prefix="/admin", tags=["admin"])


@router.get("/users", response_model=list[UserResponse])
def list_users(
    db: Session = Depends(get_db),
    _: User = Depends(get_current_admin),
):
    return db.query(User).order_by(User.created_at).all()


@router.post("/users", response_model=UserResponse, status_code=201)
def create_user(
    user_in: UserCreate,
    db: Session = Depends(get_db),
    _: User = Depends(get_current_admin),
):
    if db.query(User).filter(User.username == user_in.username).first():
        raise HTTPException(status_code=400, detail="Username already exists.")
    if user_in.email and db.query(User).filter(User.email == user_in.email).first():
        raise HTTPException(status_code=400, detail="Email already in use.")

    user = User(
        username=user_in.username,
        full_name=user_in.full_name,
        email=user_in.email,
        hashed_password=hash_password(user_in.password),
        is_admin=user_in.is_admin,
        is_active=True,
    )
    db.add(user)
    db.commit()
    db.refresh(user)
    return user


@router.put("/users/{user_id}", response_model=UserResponse)
def update_user(
    user_id: int,
    user_in: UserUpdate,
    db: Session = Depends(get_db),
    current: User = Depends(get_current_admin),
):
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="User not found.")

    for field, value in user_in.model_dump(exclude_unset=True).items():
        setattr(user, field, value)

    db.commit()
    db.refresh(user)
    return user


@router.post("/users/{user_id}/reset-password", response_model=UserResponse)
def reset_password(
    user_id: int,
    body: PasswordReset,
    db: Session = Depends(get_db),
    _: User = Depends(get_current_admin),
):
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="User not found.")
    if not body.new_password or len(body.new_password) < 6:
        raise HTTPException(status_code=400, detail="Password must be at least 6 characters.")

    user.hashed_password = hash_password(body.new_password)
    db.commit()
    db.refresh(user)
    return user


@router.delete("/users/{user_id}", status_code=204)
def delete_user(
    user_id: int,
    db: Session = Depends(get_db),
    current: User = Depends(get_current_admin),
):
    if user_id == current.id:
        raise HTTPException(status_code=400, detail="You cannot delete your own account.")
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="User not found.")
    db.delete(user)
    db.commit()