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#ifndef MOZC_REWRITER_SYMBOL_REWRITER_H_
#define MOZC_REWRITER_SYMBOL_REWRITER_H_

#include <string>

#include "base/scoped_ptr.h"
#include "rewriter/embedded_dictionary.h"
#include "rewriter/rewriter_interface.h"
// for FRIEND_TEST()
#include "testing/base/public/gunit_prod.h"

namespace mozc {

class ConversionRequest;
class ConverterInterface;
class DataManagerInterface;
class EmbeddedDictionary;
class Segment;
class Segments;

class SymbolRewriter : public RewriterInterface  {
 public:
  explicit SymbolRewriter(const ConverterInterface *parent_converter,
                          const DataManagerInterface *data_manager);
  virtual ~SymbolRewriter();

  virtual int capability(const ConversionRequest &request) const;

  virtual bool Rewrite(const ConversionRequest &request,
                       Segments *segments) const;

 private:
  FRIEND_TEST(SymbolRewriterTest, TriggerRewriteEntireTest);
  FRIEND_TEST(SymbolRewriterTest, TriggerRewriteEachTest);
  FRIEND_TEST(SymbolRewriterTest, TriggerRewriteDescriptionTest);
  FRIEND_TEST(SymbolRewriterTest, SplitDescriptionTest);

  // Some characters may have different description for full/half width forms.
  // Here we just change the description in this function.
  static const string GetDescription(const string &value,
                                     const char *description,
                                     const char *additional_description);

  // return true key has no-hiragana
  static bool IsSymbol(const string &key);

  // Insert alternative form of space.
  static void ExpandSpace(Segment *segment);

  // Returns true if the symbol is platform dependent
  static bool IsPlatformDependent(const EmbeddedDictionary::Value &value);

  // Return true if two symbols are in same group.
  static bool InSameSymbolGroup(const EmbeddedDictionary::Value &lhs,
                                const EmbeddedDictionary::Value &rhs);

  // Insert Symbol into segment.
  static void InsertCandidates(const EmbeddedDictionary::Value *value,
                               size_t size,
                               bool context_sensitive,
                               Segment *segment);

  // Add symbol desc to exsisting candidates
  static void AddDescForCurrentCandidates(
      const EmbeddedDictionary::Value *value,
      size_t size, Segment *segment);

  // Insert symbols using connected all segments.
  bool RewriteEntireCandidate(const ConversionRequest &request,
                              Segments *segments) const;

  // Insert symbols using single segment.
  bool RewriteEachCandidate(Segments *segments) const;

  const ConverterInterface *parent_converter_;
  scoped_ptr<EmbeddedDictionary> dictionary_;
};

}  // namespace mozc

#endif  // MOZC_REWRITER_SYMBOL_REWRITER_H_