"""User management (admin only)."""
from __future__ import annotations

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.deps import require_admin
from app.core.security import hash_password
from app.database import get_db
from app.models.user import User
from app.schemas import UserCreate, UserOut, UserUpdate
from app.services.audit import record_audit

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


@router.get("", response_model=list[UserOut])
async def list_users(db: AsyncSession = Depends(get_db), _: User = Depends(require_admin)):
    res = await db.execute(select(User).order_by(User.id))
    return res.scalars().all()


@router.post("", response_model=UserOut, status_code=status.HTTP_201_CREATED)
async def create_user(
    body: UserCreate,
    db: AsyncSession = Depends(get_db),
    admin: User = Depends(require_admin),
):
    exists = await db.execute(select(User).where(User.email == body.email))
    if exists.scalar_one_or_none():
        raise HTTPException(status_code=409, detail="Email already registered")
    user = User(
        email=body.email,
        full_name=body.full_name,
        hashed_password=hash_password(body.password),
        role=body.role,
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)
    await record_audit(db, admin, "user.create", "user", user.id, {"email": user.email, "role": user.role.value})
    return user


@router.patch("/{user_id}", response_model=UserOut)
async def update_user(
    user_id: int,
    body: UserUpdate,
    db: AsyncSession = Depends(get_db),
    admin: User = Depends(require_admin),
):
    res = await db.execute(select(User).where(User.id == user_id))
    user = res.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    if body.full_name is not None:
        user.full_name = body.full_name
    if body.role is not None:
        user.role = body.role
    if body.is_active is not None:
        user.is_active = body.is_active
    if body.password:
        user.hashed_password = hash_password(body.password)
    await db.commit()
    await db.refresh(user)
    await record_audit(db, admin, "user.update", "user", user.id)
    return user


@router.delete("/{user_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_user(
    user_id: int,
    db: AsyncSession = Depends(get_db),
    admin: User = Depends(require_admin),
):
    if user_id == admin.id:
        raise HTTPException(status_code=400, detail="Cannot delete yourself")
    res = await db.execute(select(User).where(User.id == user_id))
    user = res.scalar_one_or_none()
    if not user:
        raise HTTPException(status_code=404, detail="User not found")
    await db.delete(user)
    await db.commit()
    await record_audit(db, admin, "user.delete", "user", user_id)