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#include "google/protobuf/compiler/rust/accessors/accessors.h"

#include <memory>

#include "google/protobuf/compiler/rust/context.h"
#include "google/protobuf/descriptor.h"
#include "google/protobuf/descriptor.pb.h"

namespace google {
namespace protobuf {
namespace compiler {
namespace rust {
std::unique_ptr<AccessorGenerator> AccessorGenerator::For(
    Context<FieldDescriptor> field) {
  // We do not support [ctype=FOO] (used to set the field type in C++ to
  // cord or string_piece) in V0 API.
  if (field.desc().options().has_ctype()) {
    return nullptr;
  }

  switch (field.desc().type()) {
    case FieldDescriptor::TYPE_INT32:
    case FieldDescriptor::TYPE_INT64:
    case FieldDescriptor::TYPE_FIXED32:
    case FieldDescriptor::TYPE_FIXED64:
    case FieldDescriptor::TYPE_SINT32:
    case FieldDescriptor::TYPE_SINT64:
    case FieldDescriptor::TYPE_UINT32:
    case FieldDescriptor::TYPE_UINT64:
    case FieldDescriptor::TYPE_FLOAT:
    case FieldDescriptor::TYPE_DOUBLE:
    case FieldDescriptor::TYPE_BOOL:
      if (field.desc().is_repeated()) return nullptr;
      return ForSingularScalar(field);
    case FieldDescriptor::TYPE_BYTES:
      if (field.desc().is_repeated()) return nullptr;
      return ForSingularBytes(field);

    default:
      return nullptr;
  }
}
}  // namespace rust
}  // namespace compiler
}  // namespace protobuf
}  // namespace google
