//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, 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.
//
//===----------------------------------------------------------------------===//
#ifdef TORCH_MLIR_ENABLE_STABLEHLO
#include "PassDetail.h"

#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/Math/IR/Math.h"
#include "mlir/Dialect/Shape/IR/Shape.h"
#include "mlir/Dialect/Tensor/IR/Tensor.h"
#include "mlir/Transforms/DialectConversion.h"
#include "stablehlo/dialect/ChloOps.h"
#include "stablehlo/dialect/StablehloOps.h"
#include "torch-mlir/Dialect/TorchConversion/Transforms/Passes.h"

using namespace mlir;
using namespace mlir::torch;
using namespace mlir::torch::TorchConversion;

namespace {
class VerifyStablehloBackendContractPass
    : public VerifyStablehloBackendContractBase<
          VerifyStablehloBackendContractPass> {
  void runOnOperation() override {
    TypeConverter converter;
    converter.addConversion([](Type type) -> Type {
      auto elemTy = type;
      if (isa<TensorType>(type))
        elemTy = cast<TensorType>(type).getElementType();
      if (BaseMemRefType::isValidElementType(elemTy))
        return type;
      return nullptr;
    });

    auto opHasLegalTypes = [&](Operation *op) { return converter.isLegal(op); };

    MLIRContext *context = &getContext();
    ConversionTarget target(*context);

    // Structural operations.
    target.addDynamicallyLegalOp<ModuleOp, func::FuncOp, func::ReturnOp>(
        opHasLegalTypes);

    target.addLegalDialect<chlo::ChloDialect>();
    target.addLegalDialect<stablehlo::StablehloDialect>();
    target.addLegalDialect<tensor::TensorDialect>();
    target.addLegalDialect<arith::ArithDialect>();
    target.addLegalDialect<math::MathDialect>();
    target.addLegalDialect<shape::ShapeDialect>();
    auto moduleOp = getOperation();
    RewritePatternSet patterns(context);
    if (failed(applyFullConversion(moduleOp, target, std::move(patterns)))) {
      emitError(moduleOp.getLoc())
          << "Module does not conform to the Stablehlo backend contract. "
             "See dialect conversion legality information above.";
      return signalPassFailure();
    }
  }
};
} // namespace

std::unique_ptr<OperationPass<ModuleOp>>
mlir::torch::TorchConversion::createVerifyStablehloBackendContractPass() {
  return std::make_unique<VerifyStablehloBackendContractPass>();
}
#endif // TORCH_MLIR_ENABLE_STABLEHLO