/*
  tint.c

  Tint, Convert the image into differant shades of a user specified colour.

  Seperate Colours, Convert the image into white and the user specified colour. 
    This does not use differant shades of the user colour like tint does.

  Tux Paint - A simple drawing program for children.

  Credits: Andrew Corcoran <akanewbie@gmail.com>

  Copyright (c) 2002-2009 by Bill Kendrick and others; see AUTHORS.txt
  bill@newbreedsoftware.com
  http://www.tuxpaint.org/

  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
  (See COPYING.txt)

  Last updated: May 6, 2009
  $Id: tint.c,v 1.26 2009/06/06 16:52:06 secretlondon Exp $
*/

#include <stdio.h>
#include <string.h>
#include <libintl.h>
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"
#include <math.h>
#include <limits.h>

#ifndef gettext_noop
#define gettext_noop(String) String
#endif

enum {
	TOOL_TINT,
	TOOL_THRESHOLD,
	tint_NUM_TOOLS
};
static Uint8 tint_r, tint_g, tint_b;
static int tint_min = INT_MAX;
static int tint_max = 0;

static const int tint_RADIUS =16;

static Mix_Chunk * tint_snd_effect[tint_NUM_TOOLS];

const char * tint_snd_filenames[tint_NUM_TOOLS] = {
  "tint.wav",
  "fold.ogg" /* FIXME */
};
const char * tint_icon_filenames[tint_NUM_TOOLS] = {
  "tint.png",
  "colornwhite.png"
};
const char * tint_names[tint_NUM_TOOLS] = {
  gettext_noop("Tint"),
  gettext_noop("Color & White") // It does more than this but more intuitive than threshold.
};
const char * tint_descs[tint_NUM_TOOLS][2] = {
  {gettext_noop("Click and move the mouse around to change the color of parts of your picture."),
    gettext_noop("Click to change the color of your entire picture."),},
  {gettext_noop("Click and move the mouse around to turn parts of your picture into white and a color you choose."),
    gettext_noop("Click to turn your entire picture into white and a color you choose.")}
};

Uint32 tint_api_version(void) { return(TP_MAGIC_API_VERSION); }

//Load sounds
int tint_init(magic_api * api){
  int i;
  char fname[1024];

  for (i = 0; i < tint_NUM_TOOLS; i++){
    snprintf(fname, sizeof(fname), "%s/sounds/magic/%s", api->data_directory, tint_snd_filenames[i]);
    tint_snd_effect[i] = Mix_LoadWAV(fname);
  }
  return(1);
}

int tint_get_tool_count(magic_api * api){
  return(tint_NUM_TOOLS);
}

// Load our icons:
SDL_Surface * tint_get_icon(magic_api * api, int which){
  char fname[1024];
  snprintf(fname, sizeof(fname), "%simages/magic/%s", api->data_directory, tint_icon_filenames[which]);
  return(IMG_Load(fname));
}

// Return our names, localized:
char * tint_get_name(magic_api * api, int which){
    return(strdup(gettext_noop(tint_names[which])));
}

// Return our descriptions, localized:
char * tint_get_description(magic_api * api, int which, int mode){
  return(strdup(gettext_noop(tint_descs[which][mode-1])));
}

//Calculates the grey scale value for a rgb pixel
static int tint_grey(Uint8 r1,Uint8 g1,Uint8 b1){
	return 0.3*r1+.59*g1+0.11*b1;
}

static void do_tint_pixel(void * ptr, int which,
	         SDL_Surface * canvas, SDL_Surface * last,
	         int x, int y){

	magic_api * api = (magic_api *) ptr;
  Uint8 r,g,b;
  float h,s,v;

  SDL_GetRGB(api->getpixel(last, x, y), last->format, &r, &g, &b);
  {

  int greyValue = tint_grey(r,g,b);

  if (which == TOOL_TINT){
    api->rgbtohsv(tint_r, tint_g, tint_b, &h, &s, &v);
    api->hsvtorgb(h, s, greyValue/255.0, &r, &g, &b);
    api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, r, g, b));
  }else if (which == TOOL_THRESHOLD){
    int thresholdValue = (tint_max-tint_min)/2;
		if (greyValue < thresholdValue){
			api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, tint_r, tint_g, tint_b));
		}else{
			api->putpixel(canvas, x, y, SDL_MapRGB(canvas->format, 255, 255, 255));
		}
  }
  }
}

// Do the effect:
static void do_tint_full(void * ptr,SDL_Surface * canvas, SDL_Surface * last, int which){

	magic_api * api = (magic_api *) ptr;

	int x,y;
	for (y = 0; y < last->h; y++){
		for (x=0; x < last->w; x++){
      do_tint_pixel(ptr, which, canvas, last, x, y);
    }
  }
}

static void do_tint_brush(void * ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y){
  int xx, yy;
  magic_api * api = (magic_api *) ptr;

  for (yy = y - tint_RADIUS; yy < y + tint_RADIUS; yy++)
  {
    for (xx = x - tint_RADIUS; xx < x + tint_RADIUS; xx++)
    {
      if (api->in_circle(xx - x, yy - y, tint_RADIUS) &&
	    !api->touched(xx, yy))
      {
        do_tint_pixel(api, which, canvas, last, xx, yy);
      }
    }
  }
}

// Affect the canvas on drag:
void tint_drag(magic_api * api, int which, SDL_Surface * canvas,
	          SDL_Surface * last, int ox, int oy, int x, int y,
		  SDL_Rect * update_rect){

  api->line((void *) api, which, canvas, last, ox, oy, x, y, 1, do_tint_brush);

  api->playsound(tint_snd_effect[which], (x * 255) / canvas->w, 255);

  if (ox > x) { int tmp = ox; ox = x; x = tmp; }
  if (oy > y) { int tmp = oy; oy = y; y = tmp; }

  update_rect->x = ox - tint_RADIUS;
  update_rect->y = oy - tint_RADIUS;
  update_rect->w = (x + tint_RADIUS) - update_rect->x;
  update_rect->h = (y + tint_RADIUS) - update_rect->y;
}

// Affect the canvas on click:
void tint_click(magic_api * api, int which, int mode,
	           SDL_Surface * canvas, SDL_Surface * last,
	           int x, int y, SDL_Rect * update_rect){
  if (mode == MODE_PAINT)
    tint_drag(api, which, canvas, last, x, y, x, y, update_rect);
  else{
    update_rect->x = 0;
    update_rect->y = 0;
    update_rect->w = canvas->w;
    update_rect->h = canvas->h;
    do_tint_full(api, canvas,  last, which);
    api->playsound(tint_snd_effect[which], 128, 255);
  }
}

// Affect the canvas on release:
void tint_release(magic_api * api, int which,
	           SDL_Surface * canvas, SDL_Surface * last,
	           int x, int y, SDL_Rect * update_rect)
{
}

// No setup happened:
void tint_shutdown(magic_api * api)
{
	//Clean up sounds
	int i;
	for(i=0; i<tint_NUM_TOOLS; i++){
		if(tint_snd_effect[i] != NULL){
			Mix_FreeChunk(tint_snd_effect[i]);
		}
	}
}

// Record the color from Tux Paint:
void tint_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b)
{
  tint_r = r;
  tint_g = g;
  tint_b = b;
}

// Use colors:
int tint_requires_colors(magic_api * api, int which)
{
  return 1;
}

void tint_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas){

	int x,y;
	Uint8 r1,g1,b1;

  for (y = 0; y < canvas->h; y++){
		for (x=0; x < canvas->w; x++){
      SDL_GetRGB(api->getpixel(canvas, x, y), canvas->format, &r1, &g1, &b1);
		{
			int greyValue = tint_grey(r1,g1,b1);
		  if (greyValue<tint_min){
				tint_min=greyValue;
		  }
			if (greyValue>tint_max){
				tint_max=greyValue;
			}
		}		
		}
	}
}

void tint_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas)
{
}

int tint_modes(magic_api * api, int which)
{
  return(MODE_FULLSCREEN|MODE_PAINT);
}