"""User management API: list, detail, update, approve — only owner."""
from fastapi import APIRouter, Depends, HTTPException, Query, status
from sqlalchemy import select, func
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.middleware.auth import require_role
from app.models.user import User
from app.schemas.user import UserResponse, UserUpdateRequest

router = APIRouter(prefix="/api/v1/users", tags=["users"])


@router.get("", response_model=list[UserResponse])
async def list_users(
    page: int = Query(1, ge=1),
    page_size: int = Query(20, ge=1, le=100),
    user: User = Depends(require_role("owner")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(User).offset((page - 1) * page_size).limit(page_size)
    )
    return result.scalars().all()


@router.get("/{user_id}", response_model=UserResponse)
async def get_user(
    user_id: str,
    user: User = Depends(require_role("owner")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.id == user_id))
    target = result.scalar_one_or_none()
    if not target:
        raise HTTPException(status_code=404, detail="User not found")
    return target


@router.patch("/{user_id}", response_model=UserResponse)
async def update_user(
    user_id: str,
    body: UserUpdateRequest,
    user: User = Depends(require_role("owner")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.id == user_id))
    target = result.scalar_one_or_none()
    if not target:
        raise HTTPException(status_code=404, detail="User not found")

    if body.role is not None:
        target.role = body.role
    if body.is_active is not None:
        target.is_active = body.is_active

    await db.commit()
    await db.refresh(target)
    return target


@router.post("/{user_id}/approve", response_model=UserResponse)
async def approve_user(
    user_id: str,
    user: User = Depends(require_role("owner")),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(select(User).where(User.id == user_id))
    target = result.scalar_one_or_none()
    if not target:
        raise HTTPException(status_code=404, detail="User not found")
    if target.is_approved:
        raise HTTPException(status_code=400, detail="User already approved")

    target.is_approved = True
    await db.commit()
    await db.refresh(target)
    return target