// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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#include <iostream>
#include <google/protobuf/compiler/objectivec/objectivec_generator.h>
#include <google/protobuf/compiler/objectivec/objectivec_file.h>
#include <google/protobuf/compiler/objectivec/objectivec_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/stubs/strutil.h>

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

ObjectiveCGenerator::ObjectiveCGenerator() {}

ObjectiveCGenerator::~ObjectiveCGenerator() {}

bool ObjectiveCGenerator::Generate(const FileDescriptor* file,
                                   const string& parameter,
                                   OutputDirectory* output_directory,
                                   string* error) const {
  // -----------------------------------------------------------------
  // Parse generator options.

  Options generation_options;

  vector<pair<string, string> > options;
  ParseGeneratorParameter(parameter, &options);
  for (int i = 0; i < options.size(); i++) {
    if (options[i].first == "expected_prefixes_path") {
      generation_options.expected_prefixes_path = options[i].second;
    } else {
      *error = "error: Unknown generator option: " + options[i].first;
      return false;
    }
  }

  // -----------------------------------------------------------------

  // Validate the objc prefix/package pairing.
  if (!ValidateObjCClassPrefix(file, generation_options, error)) {
    // *error will have been filled in.
    return false;
  }

  FileGenerator file_generator(file, generation_options);
  string filepath = FilePath(file);

  // Generate header.
  {
    scoped_ptr<io::ZeroCopyOutputStream> output(
        output_directory->Open(filepath + ".pbobjc.h"));
    io::Printer printer(output.get(), '$');
    file_generator.GenerateHeader(&printer);
  }

  // Generate m file.
  {
    scoped_ptr<io::ZeroCopyOutputStream> output(
        output_directory->Open(filepath + ".pbobjc.m"));
    io::Printer printer(output.get(), '$');
    file_generator.GenerateSource(&printer);
  }

  return true;
}

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