/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2005 John Fitzgibbons and others
Copyright (C) 2007-2008 Kristian Duske
Copyright (C) 2010-2014 QuakeSpasm developers

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "quakedef.hpp"
#if defined(SDL_FRAMEWORK) || defined(NO_SDL_CONFIG)
#if defined(USE_SDL2)
#include <SDL2/SDL.h>
#else
#include <SDL/SDL.h>
#endif
#else
#include "SDL.h"
#endif
#include <stdio.h>

static void Sys_AtExit(void) {
    SDL_Quit();
}

static void Sys_InitSDL(void) {
#if defined(USE_SDL2)
    SDL_version v;
    SDL_version *sdl_version = &v;
    SDL_GetVersion(&v);
#else
    const SDL_version *sdl_version = SDL_Linked_Version();
#endif

    Sys_Printf("Found SDL version %i.%i.%i\n", sdl_version->major, sdl_version->minor, sdl_version->patch);

    if (SDL_Init(0) < 0) {
        Sys_Error("Couldn't init SDL: %s", SDL_GetError());
    }
    atexit(Sys_AtExit);
}

#define DEFAULT_MEMORY (256 * 1024 * 1024) // ericw -- was 72MB (64-bit) / 64MB (32-bit)

static quakeparms_t parms;

// On OS X we call SDL_main from the launcher, but SDL2 doesn't redefine main
// as SDL_main on OS X anymore, so we do it ourselves.
#if defined(USE_SDL2) && defined(__APPLE__)
#define main SDL_main
#endif

int main(int argc, char *argv[]) {
    double time, oldtime, newtime;

    host_parms = &parms;
    parms.basedir = ".";

    parms.argc = argc;
    parms.argv = argv;

    parms.errstate = 0;

    common::init_argv(parms.argc, parms.argv);

    isDedicated = (common::check_param("-dedicated").has_value());

    Sys_InitSDL();

    Sys_Init();

    Sys_Printf("Initializing QuakeSpasm v%s\n", QUAKESPASM_VER_STRING);

    parms.memsize = DEFAULT_MEMORY;
    if (common::check_param("-heapsize").has_value()) {
        if (const auto t = common::check_param("-heapsize").value() + 1; t < common::_argv.size())
            parms.memsize = std::atoi(common::_argv[t].c_str()) * 1024;
    }

    parms.membase = malloc(parms.memsize);

    if (!parms.membase)
        Sys_Error("Not enough memory free; check disk space\n");

    Sys_Printf("Host_Init\n");
    Host_Init();

    oldtime = Sys_DoubleTime();
    if (isDedicated) {
        while (1) {
            newtime = Sys_DoubleTime();
            time = newtime - oldtime;

            while (time < sys_ticrate.value) {
                SDL_Delay(1);
                newtime = Sys_DoubleTime();
                time = newtime - oldtime;
            }

            Host_Frame(time);
            oldtime = newtime;
        }
    } else
        while (1) {
            /* If we have no input focus at all, sleep a bit */
            if (!VID_HasMouseOrInputFocus() || cl.paused) {
                SDL_Delay(16);
            }
            /* If we're minimised, sleep a bit more */
            if (VID_IsMinimized()) {
                scr_skipupdate = 1;
                SDL_Delay(32);
            } else {
                scr_skipupdate = 0;
            }
            newtime = Sys_DoubleTime();
            time = newtime - oldtime;

            Host_Frame(time);

            if (time < sys_throttle.value && !cls.timedemo)
                SDL_Delay(1);

            oldtime = newtime;
        }

    return 0;
}
