// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_LANG_SPIRV_READER_ENUM_CONVERTER_H_
#define SRC_TINT_LANG_SPIRV_READER_ENUM_CONVERTER_H_

#include "spirv/unified1/spirv.h"
#include "spirv/unified1/spirv.hpp11"
#include "src/tint/lang/core/builtin/address_space.h"
#include "src/tint/lang/core/builtin/builtin_value.h"
#include "src/tint/lang/core/type/storage_texture.h"
#include "src/tint/lang/core/type/texture_dimension.h"
#include "src/tint/lang/spirv/reader/fail_stream.h"
#include "src/tint/lang/wgsl/ast/pipeline_stage.h"

namespace tint::reader::spirv {

/// A converter from SPIR-V enums to Tint AST enums.
class EnumConverter {
  public:
    /// Creates a new enum converter.
    /// @param fail_stream the error reporting stream.
    explicit EnumConverter(const FailStream& fail_stream);
    /// Destructor
    ~EnumConverter();

    /// Converts a SPIR-V execution model to a Tint pipeline stage.
    /// On failure, logs an error and returns kNone
    /// @param model the SPIR-V entry point execution model
    /// @returns a Tint AST pipeline stage
    ast::PipelineStage ToPipelineStage(spv::ExecutionModel model);

    /// Converts a SPIR-V storage class to a Tint address space.
    /// On failure, logs an error and returns kNone
    /// @param sc the SPIR-V storage class
    /// @returns a Tint AST address space
    builtin::AddressSpace ToAddressSpace(const spv::StorageClass sc);

    /// Converts a SPIR-V Builtin value a Tint Builtin.
    /// On failure, logs an error and returns kNone
    /// @param b the SPIR-V builtin
    /// @returns a Tint AST builtin
    builtin::BuiltinValue ToBuiltin(spv::BuiltIn b);

    /// Converts a possibly arrayed SPIR-V Dim to a Tint texture dimension.
    /// On failure, logs an error and returns kNone
    /// @param dim the SPIR-V Dim value
    /// @param arrayed true if the texture is arrayed
    /// @returns a Tint AST texture dimension
    type::TextureDimension ToDim(spv::Dim dim, bool arrayed);

    /// Converts a possibly arrayed SPIR-V Dim to a Tint texture dimension.
    /// On failure, logs an error and returns kNone
    /// @param dim the SPIR-V Dim value
    /// @param arrayed true if the texture is arrayed
    /// @returns a Tint AST texture dimension
    type::TextureDimension ToDim(SpvDim dim, bool arrayed) {
        return ToDim(static_cast<spv::Dim>(dim), arrayed);
    }

    /// Converts a SPIR-V Image Format to a TexelFormat
    /// On failure, logs an error and returns kNone
    /// @param fmt the SPIR-V format
    /// @returns a Tint AST format
    builtin::TexelFormat ToTexelFormat(spv::ImageFormat fmt);

    /// Converts a SPIR-V Image Format to a TexelFormat
    /// On failure, logs an error and returns kNone
    /// @param fmt the SPIR-V format
    /// @returns a Tint AST format
    builtin::TexelFormat ToTexelFormat(SpvImageFormat fmt) {
        return ToTexelFormat(static_cast<spv::ImageFormat>(fmt));
    }

  private:
    /// Registers a failure and returns a stream for log diagnostics.
    /// @returns a failure stream
    FailStream Fail() { return fail_stream_.Fail(); }

    FailStream fail_stream_;
};

}  // namespace tint::reader::spirv

#endif  // SRC_TINT_LANG_SPIRV_READER_ENUM_CONVERTER_H_