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use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
use crate::traits::query::Fallible;
use crate::ty::subst::UserSubsts;
use crate::ty::{ParamEnvAnd, Ty, TyCtxt};
use rustc_hir::def_id::DefId;

#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable, TypeFoldable, Lift)]
pub struct AscribeUserType<'tcx> {
    pub mir_ty: Ty<'tcx>,
    pub def_id: DefId,
    pub user_substs: UserSubsts<'tcx>,
}

impl<'tcx> AscribeUserType<'tcx> {
    pub fn new(mir_ty: Ty<'tcx>, def_id: DefId, user_substs: UserSubsts<'tcx>) -> Self {
        Self { mir_ty, def_id, user_substs }
    }
}

impl<'tcx> super::QueryTypeOp<'tcx> for AscribeUserType<'tcx> {
    type QueryResponse = ();

    fn try_fast_path(
        _tcx: TyCtxt<'tcx>,
        _key: &ParamEnvAnd<'tcx, Self>,
    ) -> Option<Self::QueryResponse> {
        None
    }

    fn perform_query(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, ()>> {
        tcx.type_op_ascribe_user_type(canonicalized)
    }
}