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#include "google/protobuf/compiler/csharp/csharp_enum.h"

#include <sstream>
#include <string>

#include "google/protobuf/compiler/code_generator.h"
#include "absl/container/flat_hash_set.h"
#include "absl/strings/str_cat.h"
#include "google/protobuf/compiler/csharp/csharp_doc_comment.h"
#include "google/protobuf/compiler/csharp/csharp_helpers.h"
#include "google/protobuf/compiler/csharp/csharp_options.h"
#include "google/protobuf/descriptor.h"
#include "google/protobuf/descriptor.pb.h"
#include "google/protobuf/io/printer.h"

namespace google {
namespace protobuf {
namespace compiler {
namespace csharp {

EnumGenerator::EnumGenerator(const EnumDescriptor* descriptor, const Options* options) :
    SourceGeneratorBase(options),
    descriptor_(descriptor) {
}

EnumGenerator::~EnumGenerator() {
}

void EnumGenerator::Generate(io::Printer* printer) {
  WriteEnumDocComment(printer, descriptor_);
  if (descriptor_->options().deprecated()) {
    printer->Print("[global::System.ObsoleteAttribute]\n");
  }
  printer->Print("$access_level$ enum $name$ {\n",
                 "access_level", class_access_level(),
                 "name", descriptor_->name());
  printer->Indent();
  absl::flat_hash_set<std::string> used_names;
  absl::flat_hash_set<int> used_number;
  for (int i = 0; i < descriptor_->value_count(); i++) {
      WriteEnumValueDocComment(printer, descriptor_->value(i));
      if (descriptor_->value(i)->options().deprecated()) {
        printer->Print("[global::System.ObsoleteAttribute]\n");
      }
      std::string original_name = descriptor_->value(i)->name();
      std::string name =
          GetEnumValueName(descriptor_->name(), descriptor_->value(i)->name());
      // Make sure we don't get any duplicate names due to prefix removal.
      while (!used_names.insert(name).second) {
        // It's possible we'll end up giving this warning multiple times, but that's better than not at all.
        GOOGLE_LOG(WARNING) << "Duplicate enum value " << name << " (originally " << original_name
          << ") in " << descriptor_->name() << "; adding underscore to distinguish";
        name += "_";
      }
      int number = descriptor_->value(i)->number();
      if (!used_number.insert(number).second) {
          printer->Print("[pbr::OriginalName(\"$original_name$\", PreferredAlias = false)] $name$ = $number$,\n",
             "original_name", original_name,
             "name", name,
             "number", absl::StrCat(number));
      } else {
          printer->Print("[pbr::OriginalName(\"$original_name$\")] $name$ = $number$,\n",
             "original_name", original_name,
             "name", name,
             "number", absl::StrCat(number));
      }
  }
  printer->Outdent();
  printer->Print("}\n");
  printer->Print("\n");
}

}  // namespace csharp
}  // namespace compiler
}  // namespace protobuf
}  // namespace google