// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// http://code.google.com/p/protobuf/
//
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// Author: kenton@google.com (Kenton Varda)
//  Based on original Protocol Buffers design by
//  Sanjay Ghemawat, Jeff Dean, and others.

#include <google/protobuf/compiler/javanano/javanano_params.h>
#include <google/protobuf/compiler/javanano/javanano_generator.h>
#include <google/protobuf/compiler/javanano/javanano_file.h>
#include <google/protobuf/compiler/javanano/javanano_helpers.h>
#include <google/protobuf/io/printer.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/stubs/strutil.h>

namespace google {
namespace protobuf {
namespace compiler {
namespace javanano {

void UpdateParamsRecursively(Params& params,
    const FileDescriptor* file) {
  // Add any parameters for this file
  if (file->options().has_java_outer_classname()) {
    params.set_java_outer_classname(
      file->name(), file->options().java_outer_classname());
  }
  if (file->options().has_java_package()) {
    params.set_java_package(
      file->name(), file->options().java_package());
  }

  // Loop through all dependent files recursively
  // adding dep
  for (int i = 0; i < file->dependency_count(); i++) {
    UpdateParamsRecursively(params, file->dependency(i));
  }
}

JavaNanoGenerator::JavaNanoGenerator() {}
JavaNanoGenerator::~JavaNanoGenerator() {}

bool JavaNanoGenerator::Generate(const FileDescriptor* file,
                             const string& parameter,
                             OutputDirectory* output_directory,
                             string* error) const {
  vector<pair<string, string> > options;

  ParseGeneratorParameter(parameter, &options);

  // -----------------------------------------------------------------
  // parse generator options

  // Name a file where we will write a list of generated file names, one
  // per line.
  string output_list_file;
  Params params(file->name());

  // Get options from the proto file
  if (file->options().has_java_multiple_files()) {
    params.set_java_multiple_files(file->options().java_multiple_files());
  }

  // Update per file params
  UpdateParamsRecursively(params, file);

  // Replace any existing options with ones from command line
  for (int i = 0; i < options.size(); i++) {
    if (options[i].first == "output_list_file") {
      output_list_file = options[i].second;
    } else if (options[i].first == "java_package") {
        vector<string> parts;
        SplitStringUsing(options[i].second, "|", &parts);
        if (parts.size() != 2) {
          *error = "Bad java_package, expecting filename|PackageName found '"
            + options[i].second + "'";
          return false;
        }
        params.set_java_package(parts[0], parts[1]);
    } else if (options[i].first == "java_outer_classname") {
        vector<string> parts;
        SplitStringUsing(options[i].second, "|", &parts);
        if (parts.size() != 2) {
          *error = "Bad java_outer_classname, "
                   "expecting filename|ClassName found '"
                   + options[i].second + "'";
          return false;
        }
        params.set_java_outer_classname(parts[0], parts[1]);
    } else if (options[i].first == "java_multiple_files") {
        params.set_java_multiple_files(options[i].second == "true");
    } else {
      *error = "Ignore unknown javanano generator option: " + options[i].first;
    }
  }

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

  FileGenerator file_generator(file, params);
  if (!file_generator.Validate(error)) {
    return false;
  }

  string package_dir =
    StringReplace(file_generator.java_package(), ".", "/", true);
  if (!package_dir.empty()) package_dir += "/";

  vector<string> all_files;

  string java_filename = package_dir;
  java_filename += file_generator.classname();
  java_filename += ".java";
  all_files.push_back(java_filename);

  // Generate main java file.
  scoped_ptr<io::ZeroCopyOutputStream> output(
    output_directory->Open(java_filename));
  io::Printer printer(output.get(), '$');
  file_generator.Generate(&printer);

  // Generate sibling files.
  file_generator.GenerateSiblings(package_dir, output_directory, &all_files);

  // Generate output list if requested.
  if (!output_list_file.empty()) {
    // Generate output list.  This is just a simple text file placed in a
    // deterministic location which lists the .java files being generated.
    scoped_ptr<io::ZeroCopyOutputStream> srclist_raw_output(
      output_directory->Open(output_list_file));
    io::Printer srclist_printer(srclist_raw_output.get(), '$');
    for (int i = 0; i < all_files.size(); i++) {
      srclist_printer.Print("$filename$\n", "filename", all_files[i]);
    }
  }

  return true;
}

}  // namespace java
}  // namespace compiler
}  // namespace protobuf
}  // namespace google