// Aseprite
// Copyright (C) 2001-2016  David Capello
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 2 as
// published by the Free Software Foundation.

#ifndef UPDATER_CHECK_UPDATE_H_INCLUDED
#define UPDATER_CHECK_UPDATE_H_INCLUDED
#pragma once

#include "base/disable_copying.h"

#include <string>

namespace updater {

  typedef std::string Uuid;

  // Data received by a "check new version" request.
  class CheckUpdateResponse {
  public:
    enum Type {
      Unknown,
      NoUpdate,                 // No update available. You've the latest version.
      Critical,                 // There are critical bugs fixed.
      Major                     // New major version.
    };

    CheckUpdateResponse();
    CheckUpdateResponse(const CheckUpdateResponse& other);
    CheckUpdateResponse(const std::string& responseBody);

    // Returns the type of the available update.
    Type getUpdateType() const { return m_type; }

    // Returns the latest version available to be downloaded.
    std::string getLatestVersion() const { return m_version; }

    // Returns the URL to download the new version.
    std::string getUrl() const { return m_url; }

    // Returns a UUID to be assigned to this user. This parameter is
    // returned only when the request is done without an existent
    // UUID.
    Uuid getUuid() const { return m_uuid; }

    // Returns the number of days that this client should wait for the
    // next "check for updates".
    double getWaitDays() const { return m_waitDays; }

  private:
    Type m_type;
    std::string m_version;
    std::string m_url;
    Uuid m_uuid;
    double m_waitDays;
  };

  // Delegate called by CheckUpdate when the request to the server is
  // done. It must be implemented by the client of CheckUpdate.
  class CheckUpdateDelegate {
  public:
    virtual ~CheckUpdateDelegate() { }

    // Called by CheckUpdate::checkNewVersion() when the response from
    // the "updates server" is received.
    virtual void onResponse(CheckUpdateResponse& data) = 0;
  };

  // Checks for new versions.
  class CheckUpdate {
  public:
    CheckUpdate();
    ~CheckUpdate();

    // Cancels any operation in progress. It is called automatically in
    // the destructor.
    void abort();

    // Sends a request to the "updates server" and calls the delegate
    // when the response is received.
    bool checkNewVersion(const Uuid& uuid, const std::string& extraParams, CheckUpdateDelegate* delegate);

  private:
    class CheckUpdateImpl;
    CheckUpdateImpl* m_impl;

    DISABLE_COPYING(CheckUpdate);
  };

} // namespace updater

#endif