//===- BasicpyDialect.cpp - Basic python dialect ----------------*- 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
//
//===----------------------------------------------------------------------===//

#include "npcomp/Dialect/Basicpy/BasicpyDialect.h"
#include "mlir/IR/DialectImplementation.h"
#include "npcomp/Dialect/Basicpy/BasicpyOps.h"

using namespace mlir;
using namespace mlir::NPCOMP::Basicpy;

BasicpyDialect::BasicpyDialect(MLIRContext *context)
    : Dialect(getDialectNamespace(), context) {
  addOperations<
#define GET_OP_LIST
#include "npcomp/Dialect/Basicpy/BasicpyOps.cpp.inc"
      >();
  addTypes<EllipsisType, NoneType, SlotObjectType, UnknownType>();

  // TODO: Make real ops for everything we need.
  allowUnknownOperations();
}

Type BasicpyDialect::parseType(DialectAsmParser &parser) const {
  StringRef keyword;
  if (parser.parseKeyword(&keyword))
    return Type();

  if (keyword == "UnknownType")
    return UnknownType::get(getContext());
  if (keyword == "NoneType")
    return NoneType::get(getContext());
  if (keyword == "EllipsisType")
    return EllipsisType::get(getContext());
  if (keyword == "SlotObject") {
    StringRef className;
    if (parser.parseLess() || parser.parseKeyword(&className)) {
      return Type();
    }

    llvm::SmallVector<Type, 4> slotTypes;
    while (succeeded(parser.parseOptionalComma())) {
      Type slotType;
      if (parser.parseType(slotType))
        return Type();
      slotTypes.push_back(slotType);
    }
    if (parser.parseGreater())
      return Type();
    return SlotObjectType::get(StringAttr::get(className, getContext()),
                               slotTypes);
  }

  parser.emitError(parser.getNameLoc(), "unknown basicpy type");
  return Type();
}

void BasicpyDialect::printType(Type type, DialectAsmPrinter &os) const {
  switch (type.getKind()) {
  case BasicpyTypes::UnknownType:
    os << "UnknownType";
    return;
  case BasicpyTypes::NoneType:
    os << "NoneType";
    return;
  case BasicpyTypes::EllipsisType:
    os << "EllipsisType";
    return;
  case BasicpyTypes::SlotObjectType: {
    auto slotObject = type.cast<SlotObjectType>();
    auto slotTypes = slotObject.getSlotTypes();
    os << "SlotObject<" << slotObject.getClassName().getValue();
    if (!slotTypes.empty()) {
      os << ", ";
      llvm::interleaveComma(slotTypes, os, [&](Type t) { os.printType(t); });
    }
    os << ">";
    return;
  }
  default:
    llvm_unreachable("unexpected 'basicpy' type kind");
  }
}

//----------------------------------------------------------------------------//
// Type and attribute detail
//----------------------------------------------------------------------------//
namespace mlir {
namespace NPCOMP {
namespace Basicpy {
namespace detail {

struct SlotObjectTypeStorage : public TypeStorage {
  using KeyTy = std::pair<StringAttr, ArrayRef<Type>>;
  SlotObjectTypeStorage(StringAttr className, ArrayRef<Type> slotTypes)
      : className(className), slotTypes(slotTypes) {}
  bool operator==(const KeyTy &other) const {
    return className == other.first && slotTypes == other.second;
  }
  static llvm::hash_code hashKey(const KeyTy &key) {
    return llvm::hash_combine(key.first, key.second);
  }
  static SlotObjectTypeStorage *construct(TypeStorageAllocator &allocator,
                                          const KeyTy &key) {
    ArrayRef<Type> slotTypes = allocator.copyInto(key.second);
    return new (allocator.allocate<SlotObjectTypeStorage>())
        SlotObjectTypeStorage(key.first, slotTypes);
  }

  StringAttr className;
  ArrayRef<Type> slotTypes;
};
} // namespace detail
} // namespace Basicpy
} // namespace NPCOMP
} // namespace mlir

StringAttr SlotObjectType::getClassName() { return getImpl()->className; }
ArrayRef<Type> SlotObjectType::getSlotTypes() { return getImpl()->slotTypes; }
unsigned SlotObjectType::getSlotCount() { return getImpl()->slotTypes.size(); }

SlotObjectType SlotObjectType::get(StringAttr className,
                                   ArrayRef<Type> slotTypes) {
  return Base::get(className.getContext(), BasicpyTypes::SlotObjectType,
                   className, slotTypes);
}