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// Handler of mozc configuration.

#ifndef MOZC_CONFIG_CONFIG_HANDLER_H_
#define MOZC_CONFIG_CONFIG_HANDLER_H_

#include <string>

namespace mozc {
namespace config {
class Config;

enum {
  CONFIG_VERSION = 1,
};

// This is pure static class.
class ConfigHandler {
 public:
  // Returns current config.
  static const Config &GetConfig();

  // Returns current config.
  static bool GetConfig(Config *config);

  // Returns current config.
  // If imposed config is not set, the result is the same as GetConfig().
  static const Config &GetStoredConfig();

  // Returns stored config.
  // If imposed config is not set, the result is the same as GetConfig().
  static bool GetStoredConfig(Config *config);

  // Sets config.
  static bool SetConfig(const Config &config);

  // Sets imposed config.
  //
  // If imposed config is set, the result of GetConfig() method
  // turns to be a mixture of current confing and imposed config.
  // When merging, imposed config's fields are prioritized.
  // If you want to use raw Store config (which is not affected by
  // the imposed config), call this method with the "empty"
  // (no field values are set) config.
  //
  // Imposed config is never saved to storage.
  //
  // Reload() method does not affect the imposed config, and the same imposed
  // config is used after reloading.
  // In other words, the imposed config is neither reloaded nor reset.
  static void SetImposedConfig(const Config &config);

  // Gets default config value.
  //
  // Using this function is safer than
  // using an uninitialized config value.
  static void GetDefaultConfig(Config *config);

  // Reloads config from storage.
  //
  // This method does nothing on imposed config.
  static bool Reload();

  // Sets config file. (for unittesting)
  static void SetConfigFileName(const string &filename);

  // Get config file name.
  static string GetConfigFileName();

  // Utilitiy function to put config meta data
  static void SetMetaData(Config *config);

  // Do not allow instantiation
 private:
  ConfigHandler() {}
  virtual ~ConfigHandler() {}
};

// macro for config field
// if (GET_CONFIG(incognite_mode) == false) {
//  }
#define GET_CONFIG(field) \
  config::ConfigHandler::GetConfig().field()
}  // namespace config
}  // namespace mozc

#endif  // MOZC_CONFIG_CONFIG_HANDLER_H_