/*
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2009 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup edinterface
 */

#include "DNA_screen_types.h"
#include "DNA_space_types.h"

#include "BKE_context.h"
#include "BKE_screen.h"

#include "UI_interface.h"

#include "WM_api.h"
#include "WM_types.h"

#include "interface_intern.h"

#include "interface_eyedropper_intern.h" /* own include */

/* -------------------------------------------------------------------- */
/* Keymap
 */
/** \name Modal Keymap
 * \{ */

wmKeyMap *eyedropper_modal_keymap(wmKeyConfig *keyconf)
{
  static const EnumPropertyItem modal_items[] = {
      {EYE_MODAL_CANCEL, "CANCEL", 0, "Cancel", ""},
      {EYE_MODAL_SAMPLE_CONFIRM, "SAMPLE_CONFIRM", 0, "Confirm Sampling", ""},
      {EYE_MODAL_SAMPLE_BEGIN, "SAMPLE_BEGIN", 0, "Start Sampling", ""},
      {EYE_MODAL_SAMPLE_RESET, "SAMPLE_RESET", 0, "Reset Sampling", ""},
      {0, NULL, 0, NULL, NULL},
  };

  wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Eyedropper Modal Map");

  /* this function is called for each spacetype, only needs to add map once */
  if (keymap && keymap->modal_items) {
    return NULL;
  }

  keymap = WM_modalkeymap_ensure(keyconf, "Eyedropper Modal Map", modal_items);

  /* assign to operators */
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_colorramp");
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_color");
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_id");
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_depth");
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_driver");
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_gpencil_color");

  return keymap;
}

wmKeyMap *eyedropper_colorband_modal_keymap(wmKeyConfig *keyconf)
{
  static const EnumPropertyItem modal_items_point[] = {
      {EYE_MODAL_POINT_CANCEL, "CANCEL", 0, "Cancel", ""},
      {EYE_MODAL_POINT_SAMPLE, "SAMPLE_SAMPLE", 0, "Sample a Point", ""},
      {EYE_MODAL_POINT_CONFIRM, "SAMPLE_CONFIRM", 0, "Confirm Sampling", ""},
      {EYE_MODAL_POINT_RESET, "SAMPLE_RESET", 0, "Reset Sampling", ""},
      {0, NULL, 0, NULL, NULL},
  };

  wmKeyMap *keymap = WM_modalkeymap_find(keyconf, "Eyedropper ColorRamp PointSampling Map");
  if (keymap && keymap->modal_items) {
    return keymap;
  }

  keymap = WM_modalkeymap_ensure(
      keyconf, "Eyedropper ColorRamp PointSampling Map", modal_items_point);

  /* assign to operators */
  WM_modalkeymap_assign(keymap, "UI_OT_eyedropper_colorramp_point");

  return keymap;
}

/** \} */

/* -------------------------------------------------------------------- */
/* Utility Functions
 */
/** \name Generic Shared Functions
 * \{ */
static void eyedropper_draw_cursor_text_ex(const int x, const int y, const char *name)
{
  const uiFontStyle *fstyle = UI_FSTYLE_WIDGET;

  const float col_fg[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  const float col_bg[4] = {0.0f, 0.0f, 0.0f, 0.2f};

  UI_fontstyle_draw_simple_backdrop(fstyle, x, y + U.widget_unit, name, col_fg, col_bg);
}

void eyedropper_draw_cursor_text_window(const struct wmWindow *window, const char *name)
{
  if (name[0] == '\0') {
    return;
  }

  const int x = window->eventstate->x;
  const int y = window->eventstate->y;

  eyedropper_draw_cursor_text_ex(x, y, name);
}

void eyedropper_draw_cursor_text_region(const struct bContext *C,
                                        const ARegion *region,
                                        const char *name)
{
  wmWindow *win = CTX_wm_window(C);
  const int x = win->eventstate->x;
  const int y = win->eventstate->y;

  if ((name[0] == '\0') || (BLI_rcti_isect_pt(&region->winrct, x, y) == false)) {
    return;
  }

  const int mval[2] = {
    x - region->winrct.xmin,
    y - region->winrct.ymin,
  };

  eyedropper_draw_cursor_text_ex(mval[0], mval[1], name);
}

/**
 * Utility to retrieve a button representing a RNA property that is currently under the cursor.
 *
 * This is to be used by any eyedroppers which fetch properties (e.g. UI_OT_eyedropper_driver).
 * Especially during modal operations (e.g. as with the eyedroppers), context cannot be relied
 * upon to provide this information, as it is not updated until the operator finishes.
 *
 * \return A button under the mouse which relates to some RNA Property, or NULL
 */
uiBut *eyedropper_get_property_button_under_mouse(bContext *C, const wmEvent *event)
{
  bScreen *screen = CTX_wm_screen(C);
  ScrArea *area = BKE_screen_find_area_xy(screen, SPACE_TYPE_ANY, event->x, event->y);
  const ARegion *region = BKE_area_find_region_xy(area, RGN_TYPE_ANY, event->x, event->y);

  uiBut *but = ui_but_find_mouse_over(region, event);

  if (ELEM(NULL, but, but->rnapoin.data, but->rnaprop)) {
    return NULL;
  }
  return but;
}

/** \} */