/*
    Copyright 2005-2014 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks.

    Threading Building Blocks 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.

    Threading Building Blocks 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 Threading Building Blocks; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    As a special exception, you may use this file as part of a free software
    library without restriction.  Specifically, if other files instantiate
    templates or use macros or inline functions from this file, or you compile
    this file and link it with other files to produce an executable, this
    file does not by itself cause the resulting executable to be covered by
    the GNU General Public License.  This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

#include "video.h"
#include <cassert>
#include <stdio.h>
#include <iostream>
#include <pthread.h>

unsigned int* g_pImg = 0;
int g_sizex=0, g_sizey=0;
static video *g_video = 0;
static int g_fps = 0;
char *window_title=NULL;
#define WINDOW_TITLE_SIZE 256
int cocoa_update=0;

#include <sched.h>
#include <sys/time.h>
struct timeval g_time;

video::video()
    : red_mask(0xff0000), red_shift(16), green_mask(0xff00),
      green_shift(8), blue_mask(0xff), blue_shift(0), depth(24)
{
    assert(g_video == 0);
    g_video = this; title = "Video"; cocoa_update=1; updating = true; calc_fps = false;
}

bool video::init_window(int x, int y)
{
    g_sizex = x; g_sizey = y;
    g_pImg = new unsigned int[x*y];
    if( window_title==NULL )
        window_title = (char*)malloc(WINDOW_TITLE_SIZE);
    strncpy( window_title, title, WINDOW_TITLE_SIZE-1 );
    running = true;
    return true;
}

bool video::init_console()
{
    running = true;
    return true;
}

void video::terminate()
{
    if(calc_fps) {
        double fps = g_fps;
		struct timezone tz; struct timeval end_time; gettimeofday(&end_time, &tz);
		fps /= (end_time.tv_sec+1.0*end_time.tv_usec/1000000.0) - (g_time.tv_sec+1.0*g_time.tv_usec/1000000.0);
        printf("%s: %.1f fps\n", title, fps);
  	}
    g_video = 0; running = false;
    if(g_pImg) { delete[] g_pImg; g_pImg = 0; }
}

video::~video()
{
    if(g_video) terminate();
}

//! Count and display FPS count in titlebar
bool video::next_frame()
{
    if(calc_fps){
	    if(!g_fps) {
		    struct timezone tz; gettimeofday(&g_time, &tz);
	    }
        g_fps++;
    }
    struct timezone tz; struct timeval now_time; gettimeofday(&now_time, &tz);
    double sec=((now_time.tv_sec+1.0*now_time.tv_usec/1000000.0) - (g_time.tv_sec+1.0*g_time.tv_usec/1000000.0));
    if( sec>1 ){
        if(calc_fps) {
            memcpy(&g_time, &now_time, sizeof(g_time));
            int fps; 
            fps = g_fps/sec;
            cocoa_update = (int)updating;
            snprintf(window_title,WINDOW_TITLE_SIZE, "%s%s: %d fps", title, updating?"":" (no updating)", int(fps));
            g_fps=0;
        }
    }
    return running;
}


void* thread_func(void*)
{
    g_video->on_process();
    exit(EXIT_SUCCESS);
}

extern "C" void on_mouse_func(int x, int y, int k)
{
    g_video->on_mouse(x, y, k);
    return;
}
 
extern "C" void on_key_func(int x)
{
    g_video->on_key(x);
    return;
}

extern "C" int cocoa_main( int argc, char *argv[] );
//! Do standard loop
void video::main_loop()
{
    pthread_t handle;
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_create(&handle,&attr,&thread_func,(void*)NULL);
    pthread_detach(handle);
    cocoa_main( 0, NULL );
}

//! Change window title
void video::show_title()
{
    strncpy( window_title, title, WINDOW_TITLE_SIZE );
    return;
}

///////////////////////////////////////////// public methods of video class ///////////////////////

drawing_area::drawing_area(int x, int y, int sizex, int sizey)
    : start_x(x), start_y(y), size_x(sizex), size_y(sizey), pixel_depth(24),
    base_index(y*g_sizex + x), max_index(g_sizex*g_sizey), index_stride(g_sizex), ptr32(g_pImg)
{
    assert(x < g_sizex); assert(y < g_sizey);
    assert(x+sizex <= g_sizex); assert(y+sizey <= g_sizey);

    index = base_index; // current index
}

void drawing_area::update() 
{
    //nothing to do, updating via timer in cocoa part. 
}