/*
 * 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) 2008 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup edinterface
 *
 * Pie Menu Region
 */

#include <stdarg.h>
#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"

#include "DNA_userdef_types.h"

#include "BLI_blenlib.h"
#include "BLI_utildefines.h"

#include "PIL_time.h"

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

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

#include "RNA_access.h"

#include "UI_interface.h"

#include "BLT_translation.h"

#include "ED_screen.h"

#include "interface_intern.h"
#include "interface_regions_intern.h"

/* -------------------------------------------------------------------- */
/** \name Pie Menu
 * \{ */

struct uiPieMenu {
  uiBlock *block_radial; /* radial block of the pie menu (more could be added later) */
  uiLayout *layout;
  int mx, my;
};

static uiBlock *ui_block_func_PIE(bContext *UNUSED(C), uiPopupBlockHandle *handle, void *arg_pie)
{
  uiBlock *block;
  uiPieMenu *pie = arg_pie;
  int minwidth, width, height;

  minwidth = UI_MENU_WIDTH_MIN;
  block = pie->block_radial;

  /* in some cases we create the block before the region,
   * so we set it delayed here if necessary */
  if (BLI_findindex(&handle->region->uiblocks, block) == -1) {
    UI_block_region_set(block, handle->region);
  }

  UI_block_layout_resolve(block, &width, &height);

  UI_block_flag_enable(block, UI_BLOCK_LOOP | UI_BLOCK_NUMSELECT);
  UI_block_theme_style_set(block, UI_BLOCK_THEME_STYLE_POPUP);

  block->minbounds = minwidth;
  block->bounds = 1;
  block->bounds_offset[0] = 0;
  block->bounds_offset[1] = 0;
  block->bounds_type = UI_BLOCK_BOUNDS_PIE_CENTER;

  block->pie_data.pie_center_spawned[0] = pie->mx;
  block->pie_data.pie_center_spawned[1] = pie->my;

  return pie->block_radial;
}

static float ui_pie_menu_title_width(const char *name, int icon)
{
  const uiFontStyle *fstyle = UI_FSTYLE_WIDGET;
  return (UI_fontstyle_string_width(fstyle, name) + (UI_UNIT_X * (1.50f + (icon ? 0.25f : 0.0f))));
}

uiPieMenu *UI_pie_menu_begin(struct bContext *C, const char *title, int icon, const wmEvent *event)
{
  const uiStyle *style = UI_style_get_dpi();
  uiPieMenu *pie;
  short event_type;

  wmWindow *win = CTX_wm_window(C);

  pie = MEM_callocN(sizeof(*pie), "pie menu");

  pie->block_radial = UI_block_begin(C, NULL, __func__, UI_EMBOSS);
  /* may be useful later to allow spawning pies
   * from old positions */
  /* pie->block_radial->flag |= UI_BLOCK_POPUP_MEMORY; */
  pie->block_radial->puphash = ui_popup_menu_hash(title);
  pie->block_radial->flag |= UI_BLOCK_RADIAL;

  /* if pie is spawned by a left click, release or click event,
   * it is always assumed to be click style */
  if (event->type == LEFTMOUSE || ELEM(event->val, KM_RELEASE, KM_CLICK)) {
    pie->block_radial->pie_data.flags |= UI_PIE_CLICK_STYLE;
    pie->block_radial->pie_data.event_type = EVENT_NONE;
    win->pie_event_type_lock = EVENT_NONE;
  }
  else {
    if (win->pie_event_type_last != EVENT_NONE) {
      /* original pie key has been released, so don't propagate the event */
      if (win->pie_event_type_lock == EVENT_NONE) {
        event_type = EVENT_NONE;
        pie->block_radial->pie_data.flags |= UI_PIE_CLICK_STYLE;
      }
      else {
        event_type = win->pie_event_type_last;
      }
    }
    else {
      event_type = event->type;
    }

    pie->block_radial->pie_data.event_type = event_type;
    win->pie_event_type_lock = event_type;
  }

  pie->layout = UI_block_layout(
      pie->block_radial, UI_LAYOUT_VERTICAL, UI_LAYOUT_PIEMENU, 0, 0, 200, 0, 0, style);

  /* NOTE: #wmEvent.xy is where we started dragging in case of #KM_CLICK_DRAG. */
  pie->mx = event->xy[0];
  pie->my = event->xy[1];

  /* create title button */
  if (title[0]) {
    uiBut *but;
    char titlestr[256];
    int w;
    if (icon) {
      BLI_snprintf(titlestr, sizeof(titlestr), " %s", title);
      w = ui_pie_menu_title_width(titlestr, icon);
      but = uiDefIconTextBut(pie->block_radial,
                             UI_BTYPE_LABEL,
                             0,
                             icon,
                             titlestr,
                             0,
                             0,
                             w,
                             UI_UNIT_Y,
                             NULL,
                             0.0,
                             0.0,
                             0,
                             0,
                             "");
    }
    else {
      w = ui_pie_menu_title_width(title, 0);
      but = uiDefBut(pie->block_radial,
                     UI_BTYPE_LABEL,
                     0,
                     title,
                     0,
                     0,
                     w,
                     UI_UNIT_Y,
                     NULL,
                     0.0,
                     0.0,
                     0,
                     0,
                     "");
    }
    /* do not align left */
    but->drawflag &= ~UI_BUT_TEXT_LEFT;
    pie->block_radial->pie_data.title = but->str;
    pie->block_radial->pie_data.icon = icon;
  }

  return pie;
}

void UI_pie_menu_end(bContext *C, uiPieMenu *pie)
{
  wmWindow *window = CTX_wm_window(C);
  uiPopupBlockHandle *menu;

  menu = ui_popup_block_create(C, NULL, NULL, NULL, ui_block_func_PIE, pie, NULL);
  menu->popup = true;
  menu->towardstime = PIL_check_seconds_timer();

  UI_popup_handlers_add(C, &window->modalhandlers, menu, WM_HANDLER_ACCEPT_DBL_CLICK);
  WM_event_add_mousemove(window);

  MEM_freeN(pie);
}

uiLayout *UI_pie_menu_layout(uiPieMenu *pie)
{
  return pie->layout;
}

int UI_pie_menu_invoke(struct bContext *C, const char *idname, const wmEvent *event)
{
  uiPieMenu *pie;
  uiLayout *layout;
  MenuType *mt = WM_menutype_find(idname, true);

  if (mt == NULL) {
    printf("%s: named menu \"%s\" not found\n", __func__, idname);
    return OPERATOR_CANCELLED;
  }

  if (WM_menutype_poll(C, mt) == false) {
    /* cancel but allow event to pass through, just like operators do */
    return (OPERATOR_CANCELLED | OPERATOR_PASS_THROUGH);
  }

  pie = UI_pie_menu_begin(C, IFACE_(mt->label), ICON_NONE, event);
  layout = UI_pie_menu_layout(pie);

  UI_menutype_draw(C, mt, layout);

  UI_pie_menu_end(C, pie);

  return OPERATOR_INTERFACE;
}

int UI_pie_menu_invoke_from_operator_enum(struct bContext *C,
                                          const char *title,
                                          const char *opname,
                                          const char *propname,
                                          const wmEvent *event)
{
  uiPieMenu *pie;
  uiLayout *layout;

  pie = UI_pie_menu_begin(C, IFACE_(title), ICON_NONE, event);
  layout = UI_pie_menu_layout(pie);

  layout = uiLayoutRadial(layout);
  uiItemsEnumO(layout, opname, propname);

  UI_pie_menu_end(C, pie);

  return OPERATOR_INTERFACE;
}

int UI_pie_menu_invoke_from_rna_enum(struct bContext *C,
                                     const char *title,
                                     const char *path,
                                     const wmEvent *event)
{
  PointerRNA ctx_ptr;
  PointerRNA r_ptr;
  PropertyRNA *r_prop;
  uiPieMenu *pie;
  uiLayout *layout;

  RNA_pointer_create(NULL, &RNA_Context, C, &ctx_ptr);

  if (!RNA_path_resolve(&ctx_ptr, path, &r_ptr, &r_prop)) {
    return OPERATOR_CANCELLED;
  }

  /* invalid property, only accept enums */
  if (RNA_property_type(r_prop) != PROP_ENUM) {
    BLI_assert(0);
    return OPERATOR_CANCELLED;
  }

  pie = UI_pie_menu_begin(C, IFACE_(title), ICON_NONE, event);

  layout = UI_pie_menu_layout(pie);

  layout = uiLayoutRadial(layout);
  uiItemFullR(layout, &r_ptr, r_prop, RNA_NO_INDEX, 0, UI_ITEM_R_EXPAND, NULL, 0);

  UI_pie_menu_end(C, pie);

  return OPERATOR_INTERFACE;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Pie Menu Levels
 *
 * Pie menus can't contain more than 8 items (yet).
 * When using #uiItemsFullEnumO, a "More" button is created that calls
 * a new pie menu if the enum has too many items. We call this a new "level".
 * Indirect recursion is used, so that a theoretically unlimited number of items is supported.
 *
 * This is a implementation specifically for operator enums,
 * needed since the object mode pie now has more than 8 items.
 * Ideally we'd have some way of handling this for all kinds of pie items, but that's tricky.
 *
 * - Julian (Feb 2016)
 * \{ */

typedef struct PieMenuLevelData {
  char title[UI_MAX_NAME_STR]; /* parent pie title, copied for level */
  int icon;                    /* parent pie icon, copied for level */
  int totitem;                 /* total count of *remaining* items */

  /* needed for calling uiItemsFullEnumO_array again for new level */
  wmOperatorType *ot;
  const char *propname;
  IDProperty *properties;
  wmOperatorCallContext context, flag;
} PieMenuLevelData;

/**
 * Invokes a new pie menu for a new level.
 */
static void ui_pie_menu_level_invoke(bContext *C, void *argN, void *arg2)
{
  EnumPropertyItem *item_array = (EnumPropertyItem *)argN;
  PieMenuLevelData *lvl = (PieMenuLevelData *)arg2;
  wmWindow *win = CTX_wm_window(C);

  uiPieMenu *pie = UI_pie_menu_begin(C, IFACE_(lvl->title), lvl->icon, win->eventstate);
  uiLayout *layout = UI_pie_menu_layout(pie);

  layout = uiLayoutRadial(layout);

  PointerRNA ptr;

  WM_operator_properties_create_ptr(&ptr, lvl->ot);
  /* so the context is passed to itemf functions (some need it) */
  WM_operator_properties_sanitize(&ptr, false);
  PropertyRNA *prop = RNA_struct_find_property(&ptr, lvl->propname);

  if (prop) {
    uiItemsFullEnumO_items(layout,
                           lvl->ot,
                           ptr,
                           prop,
                           lvl->properties,
                           lvl->context,
                           lvl->flag,
                           item_array,
                           lvl->totitem);
  }
  else {
    RNA_warning("%s.%s not found", RNA_struct_identifier(ptr.type), lvl->propname);
  }

  UI_pie_menu_end(C, pie);
}

void ui_pie_menu_level_create(uiBlock *block,
                              wmOperatorType *ot,
                              const char *propname,
                              IDProperty *properties,
                              const EnumPropertyItem *items,
                              int totitem,
                              wmOperatorCallContext context,
                              int flag)
{
  const int totitem_parent = PIE_MAX_ITEMS - 1;
  const int totitem_remain = totitem - totitem_parent;
  const size_t array_size = sizeof(EnumPropertyItem) * totitem_remain;

  /* used as but->func_argN so freeing is handled elsewhere */
  EnumPropertyItem *remaining = MEM_mallocN(array_size + sizeof(EnumPropertyItem),
                                            "pie_level_item_array");
  memcpy(remaining, items + totitem_parent, array_size);
  /* A NULL terminating sentinel element is required. */
  memset(&remaining[totitem_remain], 0, sizeof(EnumPropertyItem));

  /* yuk, static... issue is we can't reliably free this without doing dangerous changes */
  static PieMenuLevelData lvl;
  BLI_strncpy(lvl.title, block->pie_data.title, UI_MAX_NAME_STR);
  lvl.totitem = totitem_remain;
  lvl.ot = ot;
  lvl.propname = propname;
  lvl.properties = properties;
  lvl.context = context;
  lvl.flag = flag;

  /* add a 'more' menu entry */
  uiBut *but = uiDefIconTextBut(block,
                                UI_BTYPE_BUT,
                                0,
                                ICON_PLUS,
                                "More",
                                0,
                                0,
                                UI_UNIT_X * 3,
                                UI_UNIT_Y,
                                NULL,
                                0.0f,
                                0.0f,
                                0.0f,
                                0.0f,
                                "Show more items of this menu");
  UI_but_funcN_set(but, ui_pie_menu_level_invoke, remaining, &lvl);
}

/** \} */ /* Pie Menu Levels */