/*
    This file is part of darktable,
    copyright (c) 2010-2011 Henrik Andersson.

    darktable 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 3 of the License, or
    (at your option) any later version.

    darktable 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 darktable.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <string.h>
#include "bauhaus/bauhaus.h"
#include "common/colorspaces.h"
#include "common/debug.h"
#include "common/opencl.h"
#include "develop/develop.h"
#include "develop/imageop.h"
#include "control/control.h"
#include "dtgtk/label.h"
#include "dtgtk/resetlabel.h"
#include "dtgtk/slider.h"
#include "dtgtk/gradientslider.h"
#include "dtgtk/button.h"
#include "gui/accelerators.h"
#include "gui/gtk.h"
#include "gui/presets.h"
#include <gtk/gtk.h>
#include <inttypes.h>

#define CLIP(x) ((x < 0) ? 0.0 : (x > 1.0) ? 1.0 : x)
DT_MODULE_INTROSPECTION(1, dt_iop_splittoning_params_t)

typedef struct dt_iop_splittoning_params_t
{
  float shadow_hue;
  float shadow_saturation;
  float highlight_hue;
  float highlight_saturation;
  float balance;  // center luminance of gradient
  float compress; // Compress range
} dt_iop_splittoning_params_t;

typedef struct dt_iop_splittoning_gui_data_t
{
  GtkWidget *scale1, *scale2;                  //  balance, compress
  GtkDarktableButton *colorpick1, *colorpick2; // shadow, highlight
  GtkWidget *gslider1, *gslider2, *gslider3,
      *gslider4; // highlight hue, highlight saturation, shadow hue, shadow saturation
} dt_iop_splittoning_gui_data_t;

typedef struct dt_iop_splittoning_data_t
{
  float shadow_hue;
  float shadow_saturation;
  float highlight_hue;
  float highlight_saturation;
  float balance;  // center luminance of gradient}
  float compress; // Compress range
} dt_iop_splittoning_data_t;

typedef struct dt_iop_splittoning_global_data_t
{
  int kernel_splittoning;
} dt_iop_splittoning_global_data_t;


const char *name()
{
  return _("split toning");
}

int flags()
{
  return IOP_FLAGS_INCLUDE_IN_STYLES | IOP_FLAGS_SUPPORTS_BLENDING | IOP_FLAGS_ALLOW_TILING;
}

int groups()
{
  return IOP_GROUP_EFFECT;
}

void init_key_accels(dt_iop_module_so_t *self)
{
  dt_accel_register_iop(self, FALSE, NC_("accel", "pick primary color"), 0, 0);
  dt_accel_register_iop(self, FALSE, NC_("accel", "pick secondary color"), 0, 0);

  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "balance"));
  dt_accel_register_slider_iop(self, FALSE, NC_("accel", "compress"));
}

void connect_key_accels(dt_iop_module_t *self)
{
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;

  dt_accel_connect_button_iop(self, "pick primary color", GTK_WIDGET(g->colorpick1));
  dt_accel_connect_button_iop(self, "pick secondary color", GTK_WIDGET(g->colorpick2));

  dt_accel_connect_slider_iop(self, "balance", GTK_WIDGET(g->scale1));
  dt_accel_connect_slider_iop(self, "compress", GTK_WIDGET(g->scale2));
}

void init_presets(dt_iop_module_so_t *self)
{
  DT_DEBUG_SQLITE3_EXEC(dt_database_get(darktable.db), "begin", NULL, NULL, NULL);

  // shadows: #ED7212
  // highlights: #ECA413
  // balance : 63
  // compress : 0
  dt_gui_presets_add_generic(
      _("authentic sepia"), self->op, self->version(),
      &(dt_iop_splittoning_params_t){ 26.0 / 360.0, 92.0 / 100.0, 40.0 / 360.0, 92.0 / 100.0, 0.63, 0.0 },
      sizeof(dt_iop_splittoning_params_t), 1);

  // shadows: #446CBB
  // highlights: #446CBB
  // balance : 0
  // compress : 5.22
  dt_gui_presets_add_generic(
      _("authentic cyanotype"), self->op, self->version(),
      &(dt_iop_splittoning_params_t){ 220.0 / 360.0, 64.0 / 100.0, 220.0 / 360.0, 64.0 / 100.0, 0.0, 5.22 },
      sizeof(dt_iop_splittoning_params_t), 1);

  // shadows : #A16C5E
  // highlights : #A16C5E
  // balance : 100
  // compress : 0
  dt_gui_presets_add_generic(
      _("authentic platinotype"), self->op, self->version(),
      &(dt_iop_splittoning_params_t){ 13.0 / 360.0, 42.0 / 100.0, 13.0 / 360.0, 42.0 / 100.0, 100.0, 0.0 },
      sizeof(dt_iop_splittoning_params_t), 1);

  // shadows: #211A14
  // highlights: #D9D0C7
  // balance : 60
  // compress : 0
  dt_gui_presets_add_generic(
      _("chocolate brown"), self->op, self->version(),
      &(dt_iop_splittoning_params_t){ 28.0 / 360.0, 39.0 / 100.0, 28.0 / 360.0, 8.0 / 100.0, 0.60, 0.0 },
      sizeof(dt_iop_splittoning_params_t), 1);

  DT_DEBUG_SQLITE3_EXEC(dt_database_get(darktable.db), "commit", NULL, NULL, NULL);
}

void process(struct dt_iop_module_t *self, dt_dev_pixelpipe_iop_t *piece, void *ivoid, void *ovoid,
             const dt_iop_roi_t *roi_in, const dt_iop_roi_t *roi_out)
{
  dt_iop_splittoning_data_t *data = (dt_iop_splittoning_data_t *)piece->data;
  float *in;
  float *out;
  const int ch = piece->colors;

  const float compress = (data->compress / 110.0) / 2.0; // Dont allow 100% compression..
#ifdef _OPENMP
#pragma omp parallel for default(none) shared(ivoid, ovoid, roi_out, data) private(in, out) schedule(static)
#endif
  for(int k = 0; k < roi_out->height; k++)
  {
    in = ((float *)ivoid) + (size_t)ch * k * roi_out->width;
    out = ((float *)ovoid) + (size_t)ch * k * roi_out->width;
    for(int j = 0; j < roi_out->width; j++, in += ch, out += ch)
    {
      double ra, la;
      float mixrgb[3];
      float h, s, l;
      rgb2hsl(in, &h, &s, &l);
      if(l < data->balance - compress || l > data->balance + compress)
      {
        h = l < data->balance ? data->shadow_hue : data->highlight_hue;
        s = l < data->balance ? data->shadow_saturation : data->highlight_saturation;
        ra = l < data->balance ? CLIP((fabs(-data->balance + compress + l) * 2.0))
                               : CLIP((fabs(-data->balance - compress + l) * 2.0));
        la = (1.0 - ra);

        hsl2rgb(mixrgb, h, s, l);

        out[0] = CLIP(in[0] * la + mixrgb[0] * ra);
        out[1] = CLIP(in[1] * la + mixrgb[1] * ra);
        out[2] = CLIP(in[2] * la + mixrgb[2] * ra);
      }
      else
      {
        out[0] = in[0];
        out[1] = in[1];
        out[2] = in[2];
      }

      out[3] = in[3];
    }
  }
}

#ifdef HAVE_OPENCL
int process_cl(struct dt_iop_module_t *self, dt_dev_pixelpipe_iop_t *piece, cl_mem dev_in, cl_mem dev_out,
               const dt_iop_roi_t *roi_in, const dt_iop_roi_t *roi_out)
{
  dt_iop_splittoning_data_t *d = (dt_iop_splittoning_data_t *)piece->data;
  dt_iop_splittoning_global_data_t *gd = (dt_iop_splittoning_global_data_t *)self->data;

  cl_int err = -999;
  const int devid = piece->pipe->devid;

  const int width = roi_out->width;
  const int height = roi_out->height;

  const float compress = (d->compress / 110.0) / 2.0; // Dont allow 100% compression..
  const float balance = d->balance;
  const float shadow_hue = d->shadow_hue;
  const float shadow_saturation = d->shadow_saturation;
  const float highlight_hue = d->highlight_hue;
  const float highlight_saturation = d->highlight_saturation;

  size_t sizes[2] = { ROUNDUPWD(width), ROUNDUPHT(height) };
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 0, sizeof(cl_mem), &dev_in);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 1, sizeof(cl_mem), &dev_out);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 2, sizeof(int), &width);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 3, sizeof(int), &height);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 4, sizeof(float), &compress);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 5, sizeof(float), &balance);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 6, sizeof(float), &shadow_hue);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 7, sizeof(float), &shadow_saturation);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 8, sizeof(float), &highlight_hue);
  dt_opencl_set_kernel_arg(devid, gd->kernel_splittoning, 9, sizeof(float), &highlight_saturation);
  err = dt_opencl_enqueue_kernel_2d(devid, gd->kernel_splittoning, sizes);
  if(err != CL_SUCCESS) goto error;
  return TRUE;

error:
  dt_print(DT_DEBUG_OPENCL, "[opencl_splittoning] couldn't enqueue kernel! %d\n", err);
  return FALSE;
}
#endif


void init_global(dt_iop_module_so_t *module)
{
  const int program = 8; // extended.cl from programs.conf
  dt_iop_splittoning_global_data_t *gd
      = (dt_iop_splittoning_global_data_t *)malloc(sizeof(dt_iop_splittoning_global_data_t));
  module->data = gd;
  gd->kernel_splittoning = dt_opencl_create_kernel(program, "splittoning");
}


void cleanup_global(dt_iop_module_so_t *module)
{
  dt_iop_splittoning_global_data_t *gd = (dt_iop_splittoning_global_data_t *)module->data;
  dt_opencl_free_kernel(gd->kernel_splittoning);
  free(module->data);
  module->data = NULL;
}


static void balance_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(self->dt->gui->reset) return;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;
  p->balance = dt_bauhaus_slider_get(slider) / 100.0f;
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}

static void compress_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  if(self->dt->gui->reset) return;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;
  p->compress = dt_bauhaus_slider_get(slider);
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}

static inline void update_colorpicker_fg(GtkWidget *colorpicker, float hue, float sat)
{
  float rgb[3];
  GdkColor c;
  hsl2rgb(rgb, hue, sat, 0.5);
  c.red = rgb[0] * 65535.0;
  c.green = rgb[1] * 65535.0;
  c.blue = rgb[2] * 65535.0;
  gtk_widget_modify_fg(colorpicker, GTK_STATE_NORMAL, &c);
}

static inline void update_saturation_slider_end_color(GtkWidget *slider, float hue)
{
  float rgb[3];
  hsl2rgb(rgb, hue, 1.0, 0.5);
  dt_bauhaus_slider_set_stop(slider, 1.0, rgb[0], rgb[1], rgb[2]);
}

static inline void update_balance_slider_colors(GtkWidget *slider, float hue1, float hue2)
{
  float rgb[3];
  if(hue1 != -1)
  {
    hsl2rgb(rgb, hue1, 1.0, 0.5);
    dt_bauhaus_slider_set_stop(slider, 0.0, rgb[0], rgb[1], rgb[2]);
  }
  if(hue2 != -1)
  {
    hsl2rgb(rgb, hue2, 1.0, 0.5);
    dt_bauhaus_slider_set_stop(slider, 1.0, rgb[0], rgb[1], rgb[2]);
  }
}

static void hue_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;

  double hue = 0;
  double saturation = 0;
  GtkWidget *colorpicker;
  GtkWidget *sat_slider = NULL;
  if(slider == g->gslider1)
  {
    // Shadows
    hue = p->shadow_hue = dt_bauhaus_slider_get(slider);
    saturation = p->shadow_saturation;
    colorpicker = GTK_WIDGET(g->colorpick1);
    sat_slider = g->gslider2;
    update_balance_slider_colors(g->scale1, -1, hue);
  }
  else
  {
    hue = p->highlight_hue = dt_bauhaus_slider_get(slider);
    saturation = p->highlight_saturation;
    colorpicker = GTK_WIDGET(g->colorpick2);
    sat_slider = g->gslider4;
    update_balance_slider_colors(g->scale1, hue, -1);
  }

  update_colorpicker_fg(colorpicker, hue, saturation);
  update_saturation_slider_end_color(sat_slider, hue);

  if(self->dt->gui->reset) return;

  gtk_widget_queue_draw(GTK_WIDGET(sat_slider));

  dt_dev_add_history_item(darktable.develop, self, TRUE);
}

static void saturation_callback(GtkWidget *slider, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;

  double hue = 0;
  double saturation = 0;
  GtkWidget *colorpicker;
  if(slider == g->gslider2)
  {
    // Shadows
    hue = dt_bauhaus_slider_get(g->gslider1);
    p->shadow_saturation = saturation = dt_bauhaus_slider_get(slider);
    colorpicker = GTK_WIDGET(g->colorpick1);
  }
  else
  {
    hue = dt_bauhaus_slider_get(g->gslider3);
    p->highlight_saturation = saturation = dt_bauhaus_slider_get(slider);
    colorpicker = GTK_WIDGET(g->colorpick2);
  }

  update_colorpicker_fg(colorpicker, hue, saturation);

  if(self->dt->gui->reset) return;
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}


static void colorpick_button_callback(GtkButton *button, gpointer user_data)
{
  GtkColorSelectionDialog *csd = (GtkColorSelectionDialog *)user_data;
  GtkWidget *okButton = 0;
  g_object_get(G_OBJECT(csd), "ok-button", &okButton, NULL);

  gtk_dialog_response(GTK_DIALOG(csd), (GTK_WIDGET(button) == okButton) ? GTK_RESPONSE_ACCEPT : 0);
}

static void colorpick_callback(GtkDarktableButton *button, gpointer user_data)
{
  dt_iop_module_t *self = (dt_iop_module_t *)user_data;
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;
  if(self->dt->gui->reset) return;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;

  GtkColorSelectionDialog *csd
      = GTK_COLOR_SELECTION_DIALOG(gtk_color_selection_dialog_new(_("select tone color")));
  gtk_window_set_transient_for(GTK_WINDOW(csd), GTK_WINDOW(dt_ui_main_window(darktable.gui->ui)));

  GtkWidget *okButton, *cancelButton = 0;
  g_object_get(G_OBJECT(csd), "ok-button", &okButton, NULL);
  g_object_get(G_OBJECT(csd), "cancel-button", &cancelButton, NULL);

  g_signal_connect(G_OBJECT(okButton), "clicked", G_CALLBACK(colorpick_button_callback), csd);
  g_signal_connect(G_OBJECT(cancelButton), "clicked", G_CALLBACK(colorpick_button_callback), csd);

  GtkColorSelection *cs = GTK_COLOR_SELECTION(gtk_color_selection_dialog_get_color_selection(csd));
  GdkColor c;
  float color[3], h, s, l;
  h = (button == g->colorpick1) ? p->shadow_hue : p->highlight_hue;
  s = (button == g->colorpick1) ? p->shadow_saturation : p->highlight_saturation;
  l = 0.5;
  hsl2rgb(color, h, s, l);

  c.red = 65535 * color[0];
  c.green = 65535 * color[1];
  c.blue = 65535 * color[2];
  gtk_color_selection_set_current_color(cs, &c);
  if(gtk_dialog_run(GTK_DIALOG(csd)) == GTK_RESPONSE_ACCEPT)
  {
    gtk_color_selection_get_current_color(cs, &c);
    color[0] = c.red / 65535.0;
    color[1] = c.green / 65535.0;
    color[2] = c.blue / 65535.0;
    rgb2hsl(color, &h, &s, &l);
    l = 0.5;
    hsl2rgb(color, h, s, l);

    dt_bauhaus_slider_set((button == g->colorpick1) ? g->gslider1 : g->gslider3, h);
    dt_bauhaus_slider_set((button == g->colorpick1) ? g->gslider2 : g->gslider4, s);
  }
  gtk_widget_destroy(GTK_WIDGET(csd));
  dt_dev_add_history_item(darktable.develop, self, TRUE);
}



void commit_params(struct dt_iop_module_t *self, dt_iop_params_t *p1, dt_dev_pixelpipe_t *pipe,
                   dt_dev_pixelpipe_iop_t *piece)
{
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)p1;
#ifdef HAVE_GEGL
  fprintf(stderr, "[splittoning] TODO: implement gegl version!\n");
// pull in new params to gegl
#else
  dt_iop_splittoning_data_t *d = (dt_iop_splittoning_data_t *)piece->data;
  d->shadow_hue = p->shadow_hue;
  d->highlight_hue = p->highlight_hue;
  d->shadow_saturation = p->shadow_saturation;
  d->highlight_saturation = p->highlight_saturation;
  d->balance = p->balance;
  d->compress = p->compress;
#endif
}

void init_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
#ifdef HAVE_GEGL
  // create part of the gegl pipeline
  piece->data = NULL;
#else
  piece->data = calloc(1, sizeof(dt_iop_splittoning_data_t));
  self->commit_params(self, self->default_params, pipe, piece);
#endif
}

void cleanup_pipe(struct dt_iop_module_t *self, dt_dev_pixelpipe_t *pipe, dt_dev_pixelpipe_iop_t *piece)
{
#ifdef HAVE_GEGL
  // clean up everything again.
  (void)gegl_node_remove_child(pipe->gegl, piece->input);
// no free necessary, no data is alloc'ed
#else
  free(piece->data);
  piece->data = NULL;
#endif
}

void gui_update(struct dt_iop_module_t *self)
{
  dt_iop_module_t *module = (dt_iop_module_t *)self;
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)module->params;

  dt_bauhaus_slider_set(g->gslider1, p->shadow_hue);
  dt_bauhaus_slider_set(g->gslider3, p->highlight_hue);
  dt_bauhaus_slider_set(g->gslider4, p->highlight_saturation);
  dt_bauhaus_slider_set(g->gslider2, p->shadow_saturation);
  dt_bauhaus_slider_set(g->scale1, p->balance * 100.0);
  dt_bauhaus_slider_set(g->scale2, p->compress);

  update_colorpicker_fg(GTK_WIDGET(g->colorpick1), p->shadow_hue, p->shadow_saturation);
  update_colorpicker_fg(GTK_WIDGET(g->colorpick2), p->highlight_hue, p->highlight_saturation);
  update_saturation_slider_end_color(g->gslider2, p->shadow_hue);
  update_saturation_slider_end_color(g->gslider4, p->highlight_hue);

  update_balance_slider_colors(g->scale1, p->highlight_hue, p->shadow_hue);
}

void init(dt_iop_module_t *module)
{
  module->params = malloc(sizeof(dt_iop_splittoning_params_t));
  module->default_params = malloc(sizeof(dt_iop_splittoning_params_t));
  module->default_enabled = 0;
  module->priority = 900; // module order created by iop_dependencies.py, do not edit!
  module->params_size = sizeof(dt_iop_splittoning_params_t);
  module->gui_data = NULL;
  dt_iop_splittoning_params_t tmp = (dt_iop_splittoning_params_t){ 0, 0.5, 0.2, 0.5, 0.5, 33.0 };
  memcpy(module->params, &tmp, sizeof(dt_iop_splittoning_params_t));
  memcpy(module->default_params, &tmp, sizeof(dt_iop_splittoning_params_t));
}

void cleanup(dt_iop_module_t *module)
{
  free(module->gui_data);
  module->gui_data = NULL;
  free(module->params);
  module->params = NULL;
}

static inline void gui_init_tab(struct dt_iop_module_t *self, const char *name, GtkDarktableButton **ppcolor,
                                GtkWidget **pphue, GtkWidget **ppsaturation)
{
  gtk_box_pack_start(GTK_BOX(self->widget),
                     GTK_WIDGET(dtgtk_label_new(name, DARKTABLE_LABEL_TAB | DARKTABLE_LABEL_ALIGN_RIGHT)),
                     FALSE, FALSE, 5);

  // color button
  GtkDarktableButton *color;
  *ppcolor = color = DTGTK_BUTTON(dtgtk_button_new(
      dtgtk_cairo_paint_color, CPF_IGNORE_FG_STATE | CPF_STYLE_FLAT | CPF_DO_NOT_USE_BORDER));
  gtk_widget_set_size_request(GTK_WIDGET(color), DT_PIXEL_APPLY_DPI(32), DT_PIXEL_APPLY_DPI(32));

  // hue slider
  GtkWidget *hue;
  *pphue = hue = (dt_bauhaus_slider_new_with_range_and_feedback(self, 0.0f, 1.0f, 0.01f, 0.0f, 2, 0));
  dt_bauhaus_slider_set_stop(hue, 0.0f, 1.0f, 0.0f, 0.0f);
  dt_bauhaus_widget_set_label(hue, NULL, _("hue"));
  dt_bauhaus_slider_set_stop(hue, 0.166f, 1.0f, 1.0f, 0.0f);
  dt_bauhaus_slider_set_stop(hue, 0.322f, 0.0f, 1.0f, 0.0f);
  dt_bauhaus_slider_set_stop(hue, 0.498f, 0.0f, 1.0f, 1.0f);
  dt_bauhaus_slider_set_stop(hue, 0.664f, 0.0f, 0.0f, 1.0f);
  dt_bauhaus_slider_set_stop(hue, 0.830f, 1.0f, 0.0f, 1.0f);
  dt_bauhaus_slider_set_stop(hue, 1.0f, 1.0f, 0.0f, 0.0f);
  g_object_set(G_OBJECT(hue), "tooltip-text", _("select the hue tone"), (char *)NULL);

  // saturation slider
  GtkWidget *saturation;
  *ppsaturation = saturation = dt_bauhaus_slider_new_with_range(self, 0.0f, 1.0f, 0.01f, 0.0f, 2);
  dt_bauhaus_widget_set_label(saturation, NULL, _("saturation"));
  dt_bauhaus_slider_set_stop(saturation, 0.0f, 0.2f, 0.2f, 0.2f);
  dt_bauhaus_slider_set_stop(saturation, 1.0f, 1.0f, 1.0f, 1.0f);
  g_object_set(G_OBJECT(saturation), "tooltip-text", _("select the saturation tone"), (char *)NULL);

  // pack the widgets
  GtkWidget *vbox = gtk_vbox_new(FALSE, DT_BAUHAUS_SPACE);
  gtk_box_pack_start(GTK_BOX(vbox), GTK_WIDGET(hue), FALSE, TRUE, 0);
  gtk_box_pack_end(GTK_BOX(vbox), GTK_WIDGET(saturation), FALSE, TRUE, 0);

  GtkWidget *hbox = GTK_WIDGET(gtk_hbox_new(FALSE, 0));
  gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(vbox), TRUE, TRUE, 0);
  gtk_box_pack_end(GTK_BOX(hbox), GTK_WIDGET(color), FALSE, FALSE, 0);

  gtk_box_pack_start(GTK_BOX(self->widget), GTK_WIDGET(hbox), TRUE, TRUE, 0);
}

void gui_init(struct dt_iop_module_t *self)
{
  self->gui_data = malloc(sizeof(dt_iop_splittoning_gui_data_t));
  dt_iop_splittoning_gui_data_t *g = (dt_iop_splittoning_gui_data_t *)self->gui_data;
  dt_iop_splittoning_params_t *p = (dt_iop_splittoning_params_t *)self->params;

  self->widget = GTK_WIDGET(gtk_vbox_new(FALSE, DT_BAUHAUS_SPACE));

  // Shadows
  gui_init_tab(self, _("shadows"), &g->colorpick1, &g->gslider1, &g->gslider2);

  // Highlights
  gui_init_tab(self, _("highlights"), &g->colorpick2, &g->gslider3, &g->gslider4);

  // Additional parameters
  GtkWidget *hbox = GTK_WIDGET(gtk_hbox_new(FALSE, 0));
  GtkWidget *vbox = GTK_WIDGET(gtk_vbox_new(FALSE, 0));
  gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(vbox), TRUE, TRUE, 0);
  gtk_box_pack_start(GTK_BOX(self->widget), GTK_WIDGET(hbox), TRUE, TRUE, 0);

  g->scale1 = dt_bauhaus_slider_new_with_range_and_feedback(self, 0.0, 100.0, 0.1, p->balance * 100.0, 2, 0);
  dt_bauhaus_slider_set_format(g->scale1, "%.2f");
  dt_bauhaus_slider_set_stop(g->scale1, 0.0f, 0.5f, 0.5f, 0.5f);
  dt_bauhaus_slider_set_stop(g->scale1, 1.0f, 0.5f, 0.5f, 0.5f);
  dt_bauhaus_widget_set_label(g->scale1, NULL, _("balance"));
  gtk_box_pack_start(GTK_BOX(vbox), GTK_WIDGET(g->scale1), TRUE, TRUE, 0);

  g->scale2 = dt_bauhaus_slider_new_with_range(self, 0.0, 100.0, 1.0, p->compress, 2);
  dt_bauhaus_slider_set_format(g->scale2, "%.2f%%");
  dt_bauhaus_widget_set_label(g->scale2, NULL, _("compress"));
  gtk_box_pack_start(GTK_BOX(vbox), GTK_WIDGET(g->scale2), TRUE, TRUE, 0);


  g_object_set(G_OBJECT(g->scale1), "tooltip-text", _("the balance of center of splittoning"), (char *)NULL);
  g_object_set(G_OBJECT(g->scale2), "tooltip-text",
               _("compress the effect on highlights/shadows and\npreserve midtones"), (char *)NULL);

  g_signal_connect(G_OBJECT(g->gslider1), "value-changed", G_CALLBACK(hue_callback), self);
  g_signal_connect(G_OBJECT(g->gslider3), "value-changed", G_CALLBACK(hue_callback), self);

  g_signal_connect(G_OBJECT(g->gslider2), "value-changed", G_CALLBACK(saturation_callback), self);
  g_signal_connect(G_OBJECT(g->gslider4), "value-changed", G_CALLBACK(saturation_callback), self);

  g_signal_connect(G_OBJECT(g->scale1), "value-changed", G_CALLBACK(balance_callback), self);
  g_signal_connect(G_OBJECT(g->scale2), "value-changed", G_CALLBACK(compress_callback), self);


  g_signal_connect(G_OBJECT(g->colorpick1), "clicked", G_CALLBACK(colorpick_callback), self);
  g_signal_connect(G_OBJECT(g->colorpick2), "clicked", G_CALLBACK(colorpick_callback), self);
}

void gui_cleanup(struct dt_iop_module_t *self)
{
  free(self->gui_data);
  self->gui_data = NULL;
}

// modelines: These editor modelines have been set for all relevant files by tools/update_modelines.sh
// vim: shiftwidth=2 expandtab tabstop=2 cindent
// kate: tab-indents: off; indent-width 2; replace-tabs on; indent-mode cstyle; remove-trailing-space on;
