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#include <sys/stat.h>
#include <sys/types.h>
#include <string>
#include <vector>
#include "base/util.h"
#include "base/singleton.h"
#include "converter/segments.h"
#include "rewriter/calculator_rewriter.h"
#include "rewriter/collocation_rewriter.h"
#include "rewriter/date_rewriter.h"
#include "rewriter/emoticon_rewriter.h"
#include "rewriter/english_variants_rewriter.h"
#include "rewriter/fortune_rewriter.h"
#include "rewriter/number_rewriter.h"
#include "rewriter/rewriter_interface.h"
#include "rewriter/single_kanji_rewriter.h"
#include "rewriter/symbol_rewriter.h"
#include "rewriter/transliteration_rewriter.h"
#include "rewriter/user_segment_history_rewriter.h"
#include "rewriter/user_boundary_history_rewriter.h"
#include "rewriter/variants_rewriter.h"
#include "rewriter/version_rewriter.h"

DEFINE_bool(use_history_rewriter, true, "Use history rewriter or not.");

namespace mozc {
namespace {

class RewriterImpl: public RewriterInterface {
 public:
  RewriterImpl();
  virtual ~RewriterImpl();

  // Rewrite request and/or result.
  // Can call converter if need be
  virtual bool Rewrite(Segments *segments) const;

  // Hook(s) for all mutable operations
  virtual void Finish(Segments *segments);

  virtual bool Sync();

  virtual bool Reload();

  virtual void Clear();

 private:
  EnglishVariantsRewriter *english_variants_rewriter_;
  SingleKanjiRewriter *single_kanji_rewriter_;
  SymbolRewriter *symbol_rewriter_;
  NumberRewriter *number_rewriter_;
  CollocationRewriter *collocation_rewriter_;
  DateRewriter *date_rewriter_;
  VariantsRewriter *variants_rewriter_;
  UserBoundaryHistoryRewriter *user_boundary_history_rewriter_;
  UserSegmentHistoryRewriter  *user_segment_history_rewriter_;
  VersionRewriter *version_rewriter_;
  EmoticonRewriter *emoticon_rewriter_;
  CalculatorRewriter *calculator_rewriter_;
  FortuneRewriter *fortune_rewriter_;
  TransliterationRewriter *t13n_rewriter_;
  vector<RewriterInterface *> rewriters_;
};

RewriterImpl::RewriterImpl()
    : english_variants_rewriter_(new EnglishVariantsRewriter),
      single_kanji_rewriter_(new SingleKanjiRewriter),
      symbol_rewriter_(new SymbolRewriter),
      number_rewriter_(new NumberRewriter),
      collocation_rewriter_(new CollocationRewriter),
      date_rewriter_(new DateRewriter),
      variants_rewriter_(new VariantsRewriter),
      // These two rewriters are initialized later following the
      // use_history_rewriter flag.  because it will access to the
      // local files at the initialization timing.  See comments below
      // for more details.
      user_boundary_history_rewriter_(NULL),
      user_segment_history_rewriter_(NULL),
      version_rewriter_(new VersionRewriter),
      emoticon_rewriter_(new EmoticonRewriter),
      calculator_rewriter_(new CalculatorRewriter),
      fortune_rewriter_(new FortuneRewriter),
      t13n_rewriter_(new TransliterationRewriter) {
  rewriters_.push_back(t13n_rewriter_);
  rewriters_.push_back(english_variants_rewriter_);
  rewriters_.push_back(number_rewriter_);
  rewriters_.push_back(collocation_rewriter_);
  rewriters_.push_back(single_kanji_rewriter_);
  rewriters_.push_back(symbol_rewriter_);
  rewriters_.push_back(calculator_rewriter_);
  rewriters_.push_back(emoticon_rewriter_);

  rewriters_.push_back(date_rewriter_);

  rewriters_.push_back(variants_rewriter_);

  if (FLAGS_use_history_rewriter) {
    user_boundary_history_rewriter_ = new UserBoundaryHistoryRewriter;
    user_segment_history_rewriter_ = new UserSegmentHistoryRewriter;
    rewriters_.push_back(user_boundary_history_rewriter_);
    rewriters_.push_back(user_segment_history_rewriter_);
  }

  rewriters_.push_back(fortune_rewriter_);
  rewriters_.push_back(version_rewriter_);
}

RewriterImpl::~RewriterImpl() {
  delete english_variants_rewriter_;
  delete single_kanji_rewriter_;
  delete symbol_rewriter_;
  delete number_rewriter_;
  delete collocation_rewriter_;
  delete date_rewriter_;
  delete variants_rewriter_;
  delete user_boundary_history_rewriter_;
  delete user_segment_history_rewriter_;
  delete version_rewriter_;
  delete emoticon_rewriter_;
  delete fortune_rewriter_;
  delete calculator_rewriter_;
  delete t13n_rewriter_;
  rewriters_.clear();
}

void RewriterImpl::Finish(Segments *segments) {
  for (size_t i = 0; i < rewriters_.size(); ++i) {
    rewriters_[i]->Finish(segments);
  }
}

bool RewriterImpl::Rewrite(Segments *segments) const {
  bool result = false;
  for (size_t i = 0; i < rewriters_.size(); ++i) {
    result |= rewriters_[i]->Rewrite(segments);
  }
  return result;
}

bool RewriterImpl::Sync() {
  bool result = false;
  for (size_t i = 0; i < rewriters_.size(); ++i) {
    result |= rewriters_[i]->Sync();
  }
  return result;
}

bool RewriterImpl::Reload() {
  bool result = false;
  for (size_t i = 0; i < rewriters_.size(); ++i) {
    result |= rewriters_[i]->Reload();
  }
  return result;
}

void RewriterImpl::Clear() {
  for (size_t i = 0; i < rewriters_.size(); ++i) {
    rewriters_[i]->Clear();
  }
}

RewriterInterface *g_rewriter = NULL;
}  // namespace

RewriterInterface *RewriterFactory::GetRewriter() {
  if (g_rewriter == NULL) {
    return Singleton<RewriterImpl>::get();
  } else {
    return g_rewriter;
  }
}

void RewriterFactory::SetRewriter(RewriterInterface *rewriter) {
  g_rewriter = rewriter;
}
}  // namespace mozc