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use crate::infer::canonical::{Canonicalized, CanonicalizedQueryResponse};
use crate::traits::query::Fallible;
use crate::ty::fold::TypeFoldable;
use crate::ty::{self, Lift, ParamEnvAnd, Ty, TyCtxt};
use std::fmt;

#[derive(Copy, Clone, Debug, Hash, PartialEq, Eq, HashStable, TypeFoldable, Lift)]
pub struct Normalize<T> {
    pub value: T,
}

impl<'tcx, T> Normalize<T>
where
    T: fmt::Debug + TypeFoldable<'tcx>,
{
    pub fn new(value: T) -> Self {
        Self { value }
    }
}

impl<'tcx, T> super::QueryTypeOp<'tcx> for Normalize<T>
where
    T: Normalizable<'tcx> + 'tcx,
{
    type QueryResponse = T;

    fn try_fast_path(_tcx: TyCtxt<'tcx>, key: &ParamEnvAnd<'tcx, Self>) -> Option<T> {
        if !key.value.value.has_projections() { Some(key.value.value) } else { None }
    }

    fn perform_query(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Self>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self::QueryResponse>> {
        T::type_op_method(tcx, canonicalized)
    }
}

pub trait Normalizable<'tcx>: fmt::Debug + TypeFoldable<'tcx> + Lift<'tcx> + Copy {
    fn type_op_method(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self>>;
}

impl Normalizable<'tcx> for Ty<'tcx> {
    fn type_op_method(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self>> {
        tcx.type_op_normalize_ty(canonicalized)
    }
}

impl Normalizable<'tcx> for ty::Predicate<'tcx> {
    fn type_op_method(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self>> {
        tcx.type_op_normalize_predicate(canonicalized)
    }
}

impl Normalizable<'tcx> for ty::PolyFnSig<'tcx> {
    fn type_op_method(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self>> {
        tcx.type_op_normalize_poly_fn_sig(canonicalized)
    }
}

impl Normalizable<'tcx> for ty::FnSig<'tcx> {
    fn type_op_method(
        tcx: TyCtxt<'tcx>,
        canonicalized: Canonicalized<'tcx, ParamEnvAnd<'tcx, Normalize<Self>>>,
    ) -> Fallible<CanonicalizedQueryResponse<'tcx, Self>> {
        tcx.type_op_normalize_fn_sig(canonicalized)
    }
}