// Copyright 2021 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.

#include "src/ast/interpolate_decoration.h"

#include <string>

#include "src/program_builder.h"

TINT_INSTANTIATE_TYPEINFO(tint::ast::InterpolateDecoration);

namespace tint {
namespace ast {

InterpolateDecoration::InterpolateDecoration(ProgramID program_id,
                                             const Source& source,
                                             InterpolationType type,
                                             InterpolationSampling sampling)
    : Base(program_id, source), type_(type), sampling_(sampling) {}

InterpolateDecoration::~InterpolateDecoration() = default;

std::string InterpolateDecoration::name() const {
  return "interpolate";
}

void InterpolateDecoration::to_str(const sem::Info&,
                                   std::ostream& out,
                                   size_t indent) const {
  make_indent(out, indent);
  out << "InterpolateDecoration{" << type_ << " " << sampling_ << "}"
      << std::endl;
}

InterpolateDecoration* InterpolateDecoration::Clone(CloneContext* ctx) const {
  // Clone arguments outside of create() call to have deterministic ordering
  auto src = ctx->Clone(source());
  return ctx->dst->create<InterpolateDecoration>(src, type_, sampling_);
}

std::ostream& operator<<(std::ostream& out, InterpolationType type) {
  switch (type) {
    case InterpolationType::kPerspective: {
      out << "perspective";
      break;
    }
    case InterpolationType::kLinear: {
      out << "linear";
      break;
    }
    case InterpolationType::kFlat: {
      out << "flat";
      break;
    }
  }
  return out;
}

std::ostream& operator<<(std::ostream& out, InterpolationSampling sampling) {
  switch (sampling) {
    case InterpolationSampling::kNone: {
      out << "none";
      break;
    }
    case InterpolationSampling::kCenter: {
      out << "center";
      break;
    }
    case InterpolationSampling::kCentroid: {
      out << "centroid";
      break;
    }
    case InterpolationSampling::kSample: {
      out << "sample";
      break;
    }
  }
  return out;
}

}  // namespace ast
}  // namespace tint