"""
Routes API pour la gestion des utilisateurs (admin).
"""

from typing import Optional

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

from app.core.dependencies import get_db, require_admin
from app.crud.user import UserRepository
from app.schemas.auth import UserCreate, UserUpdate, UserOut
from app.services.auth_service import hash_password

router = APIRouter()


@router.get("", response_model=list[UserOut])
async def list_users(
    limit: int = 100,
    offset: int = 0,
    include_deleted: bool = False,
    user: dict = Depends(require_admin),
    db_session: AsyncSession = Depends(get_db),
):
    """Liste tous les utilisateurs (admin uniquement)."""
    repo = UserRepository(db_session)
    users = await repo.list(limit=limit, offset=offset, include_deleted=include_deleted)
    return [UserOut.model_validate(u) for u in users]


@router.post("", response_model=UserOut, status_code=status.HTTP_201_CREATED)
async def create_user(
    user_data: UserCreate,
    user: dict = Depends(require_admin),
    db_session: AsyncSession = Depends(get_db),
):
    """Crée un nouvel utilisateur (admin uniquement)."""
    repo = UserRepository(db_session)

    # Vérifier l'unicité du username
    existing = await repo.get_by_username(user_data.username)
    if existing:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail=f"Le nom d'utilisateur '{user_data.username}' est déjà utilisé",
        )

    # Vérifier l'unicité de l'email si fourni
    if user_data.email:
        existing_email = await repo.get_by_email(user_data.email)
        if existing_email:
            raise HTTPException(
                status_code=status.HTTP_409_CONFLICT,
                detail="Cette adresse email est déjà utilisée",
            )

    hashed_password = hash_password(user_data.password)
    new_user = await repo.create(
        username=user_data.username,
        hashed_password=hashed_password,
        email=user_data.email,
        display_name=user_data.display_name,
        role=user_data.role,
        is_active=user_data.is_active,
    )
    await db_session.commit()
    await db_session.refresh(new_user)

    return UserOut.model_validate(new_user)


@router.get("/{user_id}", response_model=UserOut)
async def get_user(
    user_id: int,
    user: dict = Depends(require_admin),
    db_session: AsyncSession = Depends(get_db),
):
    """Récupère les détails d'un utilisateur (admin uniquement)."""
    repo = UserRepository(db_session)
    target_user = await repo.get(user_id)

    if not target_user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Utilisateur non trouvé",
        )

    return UserOut.model_validate(target_user)


@router.put("/{user_id}", response_model=UserOut)
async def update_user(
    user_id: int,
    user_data: UserUpdate,
    user: dict = Depends(require_admin),
    db_session: AsyncSession = Depends(get_db),
):
    """Met à jour un utilisateur (admin uniquement)."""
    repo = UserRepository(db_session)
    target_user = await repo.get(user_id)

    if not target_user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Utilisateur non trouvé",
        )

    update_fields = user_data.model_dump(exclude_unset=True)
    if update_fields:
        await repo.update(target_user, **update_fields)
        await db_session.commit()
        await db_session.refresh(target_user)

    return UserOut.model_validate(target_user)


@router.delete("/{user_id}")
async def delete_user(
    user_id: int,
    permanent: bool = False,
    user: dict = Depends(require_admin),
    db_session: AsyncSession = Depends(get_db),
):
    """Désactive ou supprime un utilisateur (admin uniquement)."""
    repo = UserRepository(db_session)
    target_user = await repo.get(user_id, include_deleted=True)

    if not target_user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Utilisateur non trouvé",
        )

    # Empêcher la suppression de soi-même
    current_user_id = user.get("user_id")
    if current_user_id and int(current_user_id) == user_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Vous ne pouvez pas supprimer votre propre compte",
        )

    if permanent:
        await repo.hard_delete(user_id)
    else:
        await repo.soft_delete(user_id)

    await db_session.commit()

    return {
        "message": f"Utilisateur {'supprimé définitivement' if permanent else 'désactivé'}",
        "user_id": user_id,
    }