#include "mlir/Transforms/DialectConversion.h"

#include "llvm/ADT/SmallVector.h"

#include "ComputeRegionBuilder.hpp"
#include "src/Accelerators/PIM/Dialect/Spatial/SpatialOps.hpp"

using namespace mlir;

namespace onnx_mlir {

Value sumTensors(ArrayRef<Value> tensors, ConversionPatternRewriter& rewriter) {
  if (tensors.size() == 1)
    return tensors[0];

  SmallVector<Value> tensors1 = {tensors.begin(), tensors.end()};
  SmallVector<Value> tensors2;
  tensors2.reserve(tensors.size() / 2);

  auto* currTensors = &tensors1;
  auto* nextTensors = &tensors2;
  while (currTensors->size() > 1) {
    for (size_t i = 0; i < currTensors->size() - 1; i += 2) {
      Value a = (*currTensors)[i];
      Value b = (*currTensors)[i + 1];
      rewriter.setInsertionPointAfterValue(b);
      auto addedValue = spatial::SpatVAddOp::create(rewriter, a.getLoc(), a.getType(), a, b);
      nextTensors->push_back(addedValue);
    }
    if (currTensors->size() % 2 == 1)
      nextTensors->push_back(currTensors->back());
    std::swap(currTensors, nextTensors);
    nextTensors->clear();
  }
  assert(currTensors->size() == 1 && "Expected a single input at this point.");
  return (*currTensors)[0];
}

} // namespace onnx_mlir