// Berkeley Open Infrastructure for Network Computing
// http://boinc.berkeley.edu
// Copyright (C) 2005 University of California
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation;
// either version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// To view the GNU Lesser General Public License visit
// http://www.gnu.org/copyleft/lesser.html
// or write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef _SS_LOGIC_
#define _SS_LOGIC_

#ifndef _WIN32
#include <ctime>
#endif

// the core client can be requested to provide screensaver graphics (SSG).
// The following are states of this function:

#define SS_STATUS_ENABLED                           1
    // requested to provide SSG
#define SS_STATUS_BLANKED                           3
    // not providing SSG, SS should blank screen
#define SS_STATUS_BOINCSUSPENDED                    4
    // not providing SS because suspended
#define SS_STATUS_NOAPPSEXECUTING                   6
    // no apps executing
#define SS_STATUS_NOGRAPHICSAPPSEXECUTING           7
    // apps executing, but none graphical
#define SS_STATUS_QUIT                              8
    // not requested to provide SSG
#define SS_STATUS_NOPROJECTSDETECTED                9

class SS_LOGIC {
public:

    SS_LOGIC();

    void start_ss(GRAPHICS_MSG&, double blank_time);
    void stop_ss();
    void poll();
    void reset();
    int  get_ss_status() { return ss_status; };
    void ask_app(ACTIVE_TASK*, GRAPHICS_MSG&);

private:
    double blank_time;          // 0 or time to blank screen
    double ack_deadline;        // when to give up on graphics app
    int  ss_status;             // the status of the screensaver from the core
                                // client perspective.
    bool do_ss;                 // true if we're acting like a screensaver
    GRAPHICS_MSG saved_graphics_msg;

// invariants
//
// at most one app has request_mode = FULLSCREEN
// pre-ss mode of all apps is not FULLSCREEN
};

#endif