/*
  clone.c

  Clone tool paintbrush Magic Tools Plugin
  Tux Paint - A simple drawing program for children.

  Copyright (c) 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: February 10, 2021
  $Id$
*/

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

/* What tools we contain: */

enum
{
  TOOL_CLONE,
  NUM_TOOLS
};


/* Tool states: */

enum
{
  CLONE_READY_TO_START,
  CLONE_STARTING,
  CLONE_CLONING
};


/* Our globals: */

static Mix_Chunk *clone_start_snd, *clone_snd;
int clone_state;
int clone_src_x, clone_src_y;
int clone_drag_start_x, clone_drag_start_y;


/* Local function prototype: */

int clone_init(magic_api * api);
Uint32 clone_api_version(void);
int clone_get_tool_count(magic_api * api);
SDL_Surface *clone_get_icon(magic_api * api, int which);
char *clone_get_name(magic_api * api, int which);
char *clone_get_description(magic_api * api, int which, int mode);
void clone_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 clone_click(magic_api * api, int which, int mode,
                  SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void clone_release(magic_api * api, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);
void clone_shutdown(magic_api * api);
void clone_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int clone_requires_colors(magic_api * api, int which);
void clone_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void clone_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int clone_modes(magic_api * api, int which);

// No setup required:
int clone_init(magic_api * api)
{
  char fname[1024];

  snprintf(fname, sizeof(fname), "%s/sounds/magic/clone_start.ogg", api->data_directory);
  clone_start_snd = Mix_LoadWAV(fname);

  snprintf(fname, sizeof(fname), "%s/sounds/magic/clone.ogg", api->data_directory);
  clone_snd = Mix_LoadWAV(fname);

  clone_state = CLONE_READY_TO_START;

  return (1);
}

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

// We have multiple tools:
int clone_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
  return (NUM_TOOLS);
}

// Load our icons:
SDL_Surface *clone_get_icon(magic_api * api, int which ATTRIBUTE_UNUSED)
{
  char fname[1024];

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

  return (IMG_Load(fname));
}

// Return our names, localized:
char *clone_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return (strdup(gettext_noop("Clone")));
}

// Return our descriptions, localized:
char *clone_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
  return (strdup(gettext_noop("Click once to pick a spot to begin cloning. Click again and drag to clone that part of the picture.")));

  return (NULL);
}

// Do the effect:

static void do_clone(void *ptr, int which ATTRIBUTE_UNUSED, SDL_Surface * canvas, SDL_Surface * last, int x, int y)
{
  magic_api *api = (magic_api *) ptr;
  Uint8 r, g, b;
  int xx, yy;
  int srcx, srcy;
  Uint32 pixel;

  srcx = clone_src_x + (x - clone_drag_start_x);
  srcy = clone_src_y + (y - clone_drag_start_y);

  for (yy = -16; yy < 16; yy++)
    {
      for (xx = -16; xx < 16; xx++)
        {
          if (api->in_circle(xx, yy, 16))
            {
              SDL_GetRGB(api->getpixel(last, srcx + xx, srcy + yy), last->format, &r, &g, &b);
              pixel = SDL_MapRGB(canvas->format, r, g, b);
              api->putpixel(canvas, x + xx, y + yy, pixel);
            }
        }
    }
}

// Affect the canvas on drag:
void clone_drag(magic_api * api, int which, SDL_Surface * canvas,
                 SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
  if (clone_state != CLONE_CLONING)
    return;

  clone_drag_start_x = ox;
  clone_drag_start_y = oy;

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

  clone_src_x += (x - ox);
  clone_src_y += (y - oy);

  if (ox > x)
    {
      int tmp = ox;

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

      oy = y;
      y = tmp;
    }

  update_rect->x = x - 64;
  update_rect->y = y - 64;
  update_rect->w = (ox + 128) - update_rect->x;
  update_rect->h = (oy + 128) - update_rect->h;

  api->playsound(clone_snd, (x * 255) / canvas->w, 255);
}

// Affect the canvas on click:
void clone_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
                  SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
  if (clone_state == CLONE_READY_TO_START) {
    clone_src_x = x;
    clone_src_y = y;
    clone_state = CLONE_STARTING;
    api->playsound(clone_start_snd, (x * 255) / canvas->w, 255);
  } else if (clone_state == CLONE_CLONING) {
    clone_drag(api, which, canvas, last, x, y, x, y, update_rect);
  }
}

void clone_release(magic_api * api, 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)
{
  if (clone_state == CLONE_STARTING) {
    clone_state = CLONE_CLONING;
  } else {
    clone_state = CLONE_READY_TO_START;
    api->stopsound();
  }
}

// No setup happened:
void clone_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
  if (clone_snd != NULL)
    Mix_FreeChunk(clone_snd);
  if (clone_start_snd != NULL)
    Mix_FreeChunk(clone_start_snd);
}

// Record the color from Tux Paint:
void clone_set_color(magic_api * api ATTRIBUTE_UNUSED, Uint8 ATTRIBUTE_UNUSED r, Uint8 ATTRIBUTE_UNUSED g, Uint8 ATTRIBUTE_UNUSED b)
{
}

// Use colors:
int clone_requires_colors(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return 0;
}

void clone_switchin(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
                     int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
  clone_state = CLONE_READY_TO_START;
}

void clone_switchout(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED,
                      int mode ATTRIBUTE_UNUSED, SDL_Surface * canvas ATTRIBUTE_UNUSED)
{
  clone_state = CLONE_READY_TO_START;
}

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