#ifndef KEYCHAIN_H
#define KEYCHAIN_H

#include <boost/utility.hpp>

#include <QString>

class Keychain : boost::noncopyable {
public:
  virtual ~Keychain() {}
  virtual bool isAvailable() = 0;

  virtual const QString getPassword(const QString& account) = 0;
  virtual bool setPassword(const QString& account, const QString& password) = 0;

  virtual const QString& implementationName() const = 0;

  static Keychain* getDefault();

protected:
  static const QString kServiceName;

private:
  // Fun for all the family.
  struct KeychainDefinition {
    KeychainDefinition(const QString& name) : name_(name) {}
    virtual ~KeychainDefinition() {}
    const QString& getName() const { return name_; }
    virtual Keychain* getInstance() const = 0;
  protected:
    const QString& name_;
  };
  template<typename T>
  struct KeychainImpl : public KeychainDefinition {
    KeychainImpl() : KeychainDefinition(T::kImplementationName) { }
    virtual Keychain* getInstance() const {
      return new T();
    }
  };

  static const KeychainDefinition* kCompiledImplementations[];
};

#endif