/*
  rainbow.c

  Rainbow Magic Tool Plugin
  Tux Paint - A simple drawing program for children.

  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 22, 2021
  $Id$
*/

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

/* Our globals: */

#define NUM_RAINBOW_COLORS 23

static const int rainbow_hexes[NUM_RAINBOW_COLORS][3] = {
  {255, 0, 0},
  {255, 64, 0},
  {255, 128, 0},
  {255, 192, 0},
  {255, 255, 0},
  {192, 255, 0},
  {128, 255, 0},
  {64, 255, 0},
  {0, 255, 0},
  {0, 255, 64},
  {0, 255, 128},
  {0, 255, 192},
  {0, 255, 255},
  {0, 192, 255},
  {0, 128, 255},
  {0, 64, 255},
  {64, 0, 255},
  {128, 0, 255},
  {192, 0, 255},
  {255, 0, 255},
  {255, 0, 192},
  {255, 0, 128},
  {255, 0, 64}
};

#define MIX_MAX 32

static int rainbow_color, rainbow_mix;
static Uint32 rainbow_rgb;
static Mix_Chunk *rainbow_snd;

int rainbow_init(magic_api * api);
Uint32 rainbow_api_version(void);
int rainbow_get_tool_count(magic_api * api);
SDL_Surface *rainbow_get_icon(magic_api * api, int which);
char *rainbow_get_name(magic_api * api, int which);
int rainbow_get_group(magic_api * api, int which);
char *rainbow_get_description(magic_api * api, int which, int mode);
static void rainbow_linecb(void *ptr, int which, SDL_Surface * canvas, SDL_Surface * last, int x, int y);

void rainbow_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 rainbow_click(magic_api * api, int which, int mode,
                   SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);

void rainbow_release(magic_api * api, int which,
                     SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect);


void rainbow_shutdown(magic_api * api);
void rainbow_set_color(magic_api * api, Uint8 r, Uint8 g, Uint8 b);
int rainbow_requires_colors(magic_api * api, int which);
void rainbow_switchin(magic_api * api, int which, int mode, SDL_Surface * canvas);
void rainbow_switchout(magic_api * api, int which, int mode, SDL_Surface * canvas);
int rainbow_modes(magic_api * api, int which);

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

// Load our sfx:
int rainbow_init(magic_api * api)
{
  char fname[1024];


  rainbow_color = 0;
  rainbow_mix = 0;

  snprintf(fname, sizeof(fname), "%ssounds/magic/rainbow.wav", api->data_directory);
  rainbow_snd = Mix_LoadWAV(fname);

  return (1);
}

// We have multiple tools:
int rainbow_get_tool_count(magic_api * api ATTRIBUTE_UNUSED)
{
  return (2);
}

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

  snprintf(fname, sizeof(fname), "%simages/magic/rainbow.png", api->data_directory);

  return (IMG_Load(fname));
}

// Return our names, localized:
char *rainbow_get_name(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  if (which == 0) {
    return (strdup(gettext_noop("Rainbow")));
  } else {
    return (strdup(gettext_noop("Smooth Rainbow")));
  }
}

// Return our group:
int rainbow_get_group(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED)
{
  return MAGIC_TYPE_PAINTING;
}

// Return our descriptions, localized:
char *rainbow_get_description(magic_api * api ATTRIBUTE_UNUSED, int which ATTRIBUTE_UNUSED, int mode ATTRIBUTE_UNUSED)
{
  return (strdup(gettext_noop("You can draw in rainbow colors!")));
}

// Do the effect:

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

  for (yy = y - 16; yy < y + 16; yy++)
    {
      for (xx = x - 16; xx < x + 16; xx++)
        {
          if (api->in_circle(xx - x, yy - y, 16))
            {
              api->putpixel(canvas, xx, yy, rainbow_rgb);
            }
        }
    }
}

// Affect the canvas on drag:
void rainbow_drag(magic_api * api, int which, SDL_Surface * canvas,
                  SDL_Surface * last, int ox, int oy, int x, int y, SDL_Rect * update_rect)
{
  Uint8 r1, g1, b1, r2, g2, b2;
  int rc_tmp;

  if (which == 1) {
    rainbow_mix += 1;
    if (rainbow_mix > MIX_MAX) {
      rainbow_mix = 0;
      rainbow_color = (rainbow_color + 1) % NUM_RAINBOW_COLORS;
    }
  } else {
    rainbow_mix = 0;
    rainbow_color = (rainbow_color + 1) % NUM_RAINBOW_COLORS;
  }

  r1 = rainbow_hexes[rainbow_color][0];
  g1 = rainbow_hexes[rainbow_color][1];
  b1 = rainbow_hexes[rainbow_color][2];

  rc_tmp = (rainbow_color + 1) % NUM_RAINBOW_COLORS;
  r2 = rainbow_hexes[rc_tmp][0];
  g2 = rainbow_hexes[rc_tmp][1];
  b2 = rainbow_hexes[rc_tmp][2];

  rainbow_rgb = SDL_MapRGB(canvas->format,
                           ((r1 * (MIX_MAX - rainbow_mix)) + (r2 * rainbow_mix)) / MIX_MAX,
                           ((g1 * (MIX_MAX - rainbow_mix)) + (g2 * rainbow_mix)) / MIX_MAX,
                           ((b1 * (MIX_MAX - rainbow_mix)) + (b2 * rainbow_mix)) / MIX_MAX);

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

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

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

      oy = y;
      y = tmp;
    }

  update_rect->x = ox - 16;
  update_rect->y = oy - 16;
  update_rect->w = (x + 16) - update_rect->x;
  update_rect->h = (y + 16) - update_rect->y;

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

// Affect the canvas on click:
void rainbow_click(magic_api * api, int which, int mode ATTRIBUTE_UNUSED,
                   SDL_Surface * canvas, SDL_Surface * last, int x, int y, SDL_Rect * update_rect)
{
  rainbow_drag(api, which, canvas, last, x, y, x, y, update_rect);
}

void rainbow_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)
{
}

// Clean up
void rainbow_shutdown(magic_api * api ATTRIBUTE_UNUSED)
{
  if (rainbow_snd != NULL)
    Mix_FreeChunk(rainbow_snd);
}

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

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

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

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

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