//===------------------------------------------------------------*- C++ -*-===//
//
// This file is licensed under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Also available under a BSD-style license. See LICENSE.
//
//===----------------------------------------------------------------------===//

#include "torch-mlir/Conversion/TorchOnnxToTorch/Patterns.h"

using namespace mlir;
using namespace mlir::torch;
using namespace mlir::torch::onnx_c;

// Simple rewrites for the default domain.
// See: https://onnx.ai/onnx/operators/
// For operators that are effectively version invariant, we register with
// sinceVersion==1. We interpret this to include the following spec
// diffs that are irrelevant to this level of lowering:
//   * Supported element types.
//   * Limited broadcasting to full broadcasting support.
//
// There are a lot of spec revisions that basically generalized elementwise
// to be more normal and a direct translation vs a special case. This
// results in a lot of ONNX test cases that all reduce to the exact same
// thing here, so we simplify.
void mlir::torch::onnx_c::populateDefaultDomainQtoZ(
    OnnxCustomOpConversionPattern &patterns) {

  patterns.onOp(
      "Selu", 6, [](OpBinder binder, ConversionPatternRewriter &rewriter) {
        Torch::ValueTensorType resultType;
        float alpha, gamma;
        Value operand;
        if (binder.tensorOperand(operand) ||
            binder.f32FloatAttr(alpha, "alpha") ||
            binder.f32FloatAttr(gamma, "gamma") ||
            binder.tensorResultType(resultType))
          return failure();

        Value vAlpha = rewriter.create<Torch::ConstantFloatOp>(
            binder.getLoc(), rewriter.getType<Torch::FloatType>(),
            rewriter.getFloatAttr(rewriter.getF64Type(), alpha));

        Value vScale = rewriter.create<Torch::ConstantFloatOp>(
            binder.getLoc(), rewriter.getType<Torch::FloatType>(),
            rewriter.getFloatAttr(rewriter.getF64Type(), gamma));

        Value vInputScale = rewriter.create<Torch::ConstantFloatOp>(
            binder.getLoc(), rewriter.getType<Torch::FloatType>(),
            rewriter.getFloatAttr(rewriter.getF64Type(), 1.0));

        rewriter.replaceOpWithNewOp<Torch::AtenEluOp>(
            binder.op, resultType, operand, vAlpha, vScale, vInputScale);
        return success();
      });
}