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#include "google/protobuf/compiler/objectivec/oneof.h"

#include <string>

#include "absl/strings/str_cat.h"
#include "google/protobuf/compiler/objectivec/helpers.h"
#include "google/protobuf/compiler/objectivec/names.h"
#include "google/protobuf/io/printer.h"

namespace google {
namespace protobuf {
namespace compiler {
namespace objectivec {

OneofGenerator::OneofGenerator(const OneofDescriptor* descriptor)
    : descriptor_(descriptor) {
  variables_["enum_name"] = OneofEnumName(descriptor_);
  variables_["name"] = OneofName(descriptor_);
  variables_["capitalized_name"] = OneofNameCapitalized(descriptor_);
  variables_["raw_index"] = absl::StrCat(descriptor_->index());
  const Descriptor* msg_descriptor = descriptor_->containing_type();
  variables_["owning_message_class"] = ClassName(msg_descriptor);

  std::string comments;
  SourceLocation location;
  if (descriptor_->GetSourceLocation(&location)) {
    comments = BuildCommentsString(location, true);
  } else {
    comments = "";
  }
  variables_["comments"] = comments;
}

void OneofGenerator::SetOneofIndexBase(int index_base) {
  int index = descriptor_->index() + index_base;
  // Flip the sign to mark it as a oneof.
  variables_["index"] = absl::StrCat(-index);
}

void OneofGenerator::GenerateCaseEnum(io::Printer* printer) const {
  printer->Print(variables_, "typedef GPB_ENUM($enum_name$) {\n");
  printer->Indent();
  printer->Print(variables_, "$enum_name$_GPBUnsetOneOfCase = 0,\n");
  std::string enum_name = variables_.find("enum_name")->second;
  for (int j = 0; j < descriptor_->field_count(); j++) {
    const FieldDescriptor* field = descriptor_->field(j);
    std::string field_name = FieldNameCapitalized(field);
    printer->Print("$enum_name$_$field_name$ = $field_number$,\n", "enum_name",
                   enum_name, "field_name", field_name, "field_number",
                   absl::StrCat(field->number()));
  }
  printer->Outdent();
  // clang-format off
  printer->Print(
      "};\n"
      "\n");
  // clang-format on
}

void OneofGenerator::GeneratePublicCasePropertyDeclaration(
    io::Printer* printer) const {
  // clang-format off
  printer->Print(
      variables_,
      "$comments$"
      "@property(nonatomic, readonly) $enum_name$ $name$OneOfCase;\n"
      "\n");
  // clang-format on
}

void OneofGenerator::GenerateClearFunctionDeclaration(
    io::Printer* printer) const {
  // clang-format off
  printer->Print(
      variables_,
      "/**\n"
      " * Clears whatever value was set for the oneof '$name$'.\n"
      " **/\n"
      "void $owning_message_class$_Clear$capitalized_name$OneOfCase($owning_message_class$ *message);\n");
  // clang-format on
}

void OneofGenerator::GeneratePropertyImplementation(
    io::Printer* printer) const {
  printer->Print(variables_, "@dynamic $name$OneOfCase;\n");
}

void OneofGenerator::GenerateClearFunctionImplementation(
    io::Printer* printer) const {
  // clang-format off
  printer->Print(
      variables_,
      "void $owning_message_class$_Clear$capitalized_name$OneOfCase($owning_message_class$ *message) {\n"
      "  GPBDescriptor *descriptor = [$owning_message_class$ descriptor];\n"
      "  GPBOneofDescriptor *oneof = [descriptor.oneofs objectAtIndex:$raw_index$];\n"
      "  GPBClearOneof(message, oneof);\n"
      "}\n");
  // clang-format on
}

std::string OneofGenerator::DescriptorName() const {
  return variables_.find("name")->second;
}

std::string OneofGenerator::HasIndexAsString() const {
  return variables_.find("index")->second;
}

}  // namespace objectivec
}  // namespace compiler
}  // namespace protobuf
}  // namespace google