/*
  puzzle.c v. 1.2

  puzzle, Puzzle tool
  Tux Paint - A simple drawing program for children.

  Author: Adam 'foo-script' Rakowski ; foo-script@o2.pl

  Copyright (c) 2002-2021 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: September 21, 2021
*/


#include <time.h>               //for time()
#include "tp_magic_api.h"
#include "SDL_image.h"
#include "SDL_mixer.h"

#define RATIO 5                 //change this value to get bigger puzzle

//TODO: Fullscreen mode
//In fullscreen mode RATIO _should_ be 1
//<=> puzzle_gcd=gcd(canvas->h, canvas->w);
//else not whole the screen will be affected


static Mix_Chunk *puzzle_snd;
static int puzzle_gcd = 0;      //length of side of each rectangle; 0 is temporary value.

// static int puzzle_rect_q=4;          //quantity of rectangles when using paint mode. Must be an odd value - but it's even!
static int rects_w, rects_h;
SDL_Surface *canvas_backup;

Uint32 puzzle_api_version(void);
int puzzle_init(magic_api * api);
int puzzle_get_tool_count(magic_api * api);
SDL_Surface *puzzle_get_icon(magic_api * api, int which);
char *puzzle_get_name(magic_api * api, int which);
int puzzle_get_group(magic_api * api, int which);
char *puzzle_get_description(magic_api * api, int which, int mode);
void puzzle_release(magic_api * api, int which,
                    SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void puzzle_shutdown(magic_api * api);
void puzzle_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int puzzle_requires_colors(magic_api * api, int which);
void puzzle_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void puzzle_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int puzzle_modes(magic_api * api, int which);
static void puzzle_draw(void *ptr, int which_tool, SDL_Surface * canvas, SDL_Surface * snapshot, int x, int y);
void puzzle_drag(magic_api * api, int which, SDL_Surface * canvas,
                 SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect);

void puzzle_click(magic_api * api, int which, int mode,
                  SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
int gcd(int a, int b);

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

int puzzle_init(magic_api * api)
{
  char fname[1024];

  snprintf(fname, sizeof(fname), "%s/sounds/magic/puzzle.wav", api->data_directory);
  puzzle_snd = Mix_LoadWAV(fname);

  return 1;
}

int puzzle_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
  return 1;
}

SDL_Surface *puzzle_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
{
  char fname[1024];

  snprintf(fname, sizeof(fname), "%s/images/magic/puzzle.png", api->data_directory);

  return (IMG_Load(fname));
}

char *puzzle_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return (strdup(gettext_noop("Puzzle")));
}

int puzzle_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return MAGIC_TYPE_DISTORTS;
}


char *puzzle_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode)
{
  if (mode == MODE_PAINT)
    return strdup(gettext_noop("Click the part of your picture where would you like a puzzle."));
  return strdup(gettext_noop("Click to make a puzzle in fullscreen mode."));
}

void puzzle_release(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
                    SDL_Surface * canvas ATTRIBUTE_UNUSED, SDL_Surface * last ATTRIBUTE_UNUSED,
                    int x ATTRIBUTE_UNUSED, int y ATTRIBUTE_UNUSED, SDL_Rect * update_rect ATTRIBUTE_UNUSED)
{
}

void puzzle_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
  if (puzzle_snd != NULL)
    Mix_FreeChunk(puzzle_snd);
}

void puzzle_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 r ATTRIBUTE_UNUSED, Uint8 g ATTRIBUTE_UNUSED,
                      Uint8 b ATTRIBUTE_UNUSED)
{
}

int puzzle_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return 0;
}

int gcd(int a, int b)           //greatest common divisor
{
  if (b == 0)
    return a;
  return gcd(b, a % b);
}

void puzzle_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
                     SDL_Surface * canvas)
{
  puzzle_gcd = RATIO * gcd(canvas->w, canvas->h);
  rects_w = (unsigned int)canvas->w / puzzle_gcd;
  rects_h = (unsigned int)canvas->h / puzzle_gcd;
  canvas_backup =
    SDL_CreateRGBSurface(SDL_ANYFORMAT, canvas->w, canvas->h, canvas->format->BitsPerPixel, canvas->format->Rmask,
                         canvas->format->Gmask, canvas->format->Bmask, canvas->format->Amask);
}

void puzzle_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED,
                      SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
  SDL_FreeSurface(canvas_backup);
  canvas_backup = NULL;
}

int puzzle_modes(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return (MODE_PAINT);
}

static void puzzle_draw(void *ptr, int which_tool ATTRIBUTE_UNUSED,
                        SDL_Surface * canvas, SDL_Surface * snapshot ATTRIBUTE_UNUSED, int x, int y)
{


  magic_api *api = (magic_api *) ptr;

  Uint8 r;                      //r - random value
  SDL_Rect rect_this, rect_that;

  SDL_BlitSurface(canvas, NULL, canvas_backup, NULL);

  x = (x / puzzle_gcd) * puzzle_gcd;
  y = (y / puzzle_gcd) * puzzle_gcd;

  if (!api->touched(x, y))
    {
      srand(rand());

      r = rand() % 4;

      rect_that.x = x;
      rect_that.y = y;

      switch (r)
        {
        case 0:                //upper
          if (y > puzzle_gcd)
            rect_that.y = y - puzzle_gcd;

          break;
        case 1:                //right
          if (x < canvas->w - puzzle_gcd)
            rect_that.x = x - puzzle_gcd;

          break;
        case 2:                //lower
          if (y < canvas->h - puzzle_gcd)
            rect_that.y = y - puzzle_gcd;

          break;
        case 3:                //left
          if (x > puzzle_gcd)
            rect_that.x = x - puzzle_gcd;
          break;
        }

      rect_this.x = x;
      rect_this.y = y;
      rect_this.h = rect_this.w = puzzle_gcd;
      rect_that.h = rect_that.w = puzzle_gcd;


      SDL_BlitSurface(canvas, &rect_this, canvas, &rect_that);
      SDL_BlitSurface(canvas_backup, &rect_that, canvas, &rect_this);
      api->playsound(puzzle_snd, (x * 255) / canvas->w, 255);
    }
}

void puzzle_drag(magic_api * api, int which, SDL_Surface * canvas,
                 SDL_Surface * last, int ox ATTRIBUTE_UNUSED, int oy ATTRIBUTE_UNUSED, int x, int y,
                 SDL_Rect * update_rect)
{
  puzzle_draw(api, which, canvas, last, x - puzzle_gcd / 2, y - puzzle_gcd / 2);

  puzzle_draw(api, which, canvas, last, x - 1.5 * puzzle_gcd / 2, y - puzzle_gcd / 2);
  puzzle_draw(api, which, canvas, last, x + 0.5 * puzzle_gcd, y - puzzle_gcd / 2);
  puzzle_draw(api, which, canvas, last, x - puzzle_gcd / 2, y - 1.5 * puzzle_gcd);
  puzzle_draw(api, which, canvas, last, x - puzzle_gcd / 2, y + 0.5 * puzzle_gcd);

  update_rect->x = 0;
  update_rect->y = 0;
  update_rect->h = canvas->h;
  update_rect->w = canvas->w;
}

void puzzle_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
                  SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
  puzzle_drag(api, which, canvas, last, x, y, x, y, update_rect);
}