/*
 * rofi
 *
 * MIT/X11 License
 * Copyright © 2013-2021 Qball Cow <qball@gmpclient.org>
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

/** The log domain of this widget. */
#define G_LOG_DOMAIN "Widgets.Box"

#include "widgets/box.h"
#include "theme.h"
#include "widgets/widget-internal.h"
#include "widgets/widget.h"
#include <stdio.h>

/** Default spacing used in the box*/
#define DEFAULT_SPACING 2

struct _box {
  widget widget;
  RofiOrientation type;
  int max_size;
  // RofiPadding between elements
  RofiDistance spacing;

  GList *children;
};

static void box_update(widget *wid);

static int box_get_desired_width(widget *wid, const int height) {
  box *b = (box *)wid;
  int spacing = distance_get_pixel(b->spacing, b->type);
  int width = 0;

  // Allow user to override.
  RofiDistance w = rofi_theme_get_distance(wid, "width", 0);
  width = distance_get_pixel(w, ROFI_ORIENTATION_HORIZONTAL);
  if (width > 0) {
    return width;
  }

  if (b->type == ROFI_ORIENTATION_HORIZONTAL) {
    int active_widgets = 0;
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (!child->enabled) {
        continue;
      }
      active_widgets++;
      if (child->expand == TRUE) {
        width += widget_get_desired_width(child, height);
        continue;
      }
      width += widget_get_desired_width(child, height);
    }
    if (active_widgets > 0) {
      width += (active_widgets - 1) * spacing;
    }
  } else {
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (!child->enabled) {
        continue;
      }
      width = MAX(widget_get_desired_width(child, height), width);
    }
  }
  width += widget_padding_get_padding_width(wid);
  return width;
}
static int box_get_desired_height(widget *wid, const int width) {
  box *b = (box *)wid;
  int spacing = distance_get_pixel(b->spacing, b->type);
  int height = 0;
  if (b->type == ROFI_ORIENTATION_VERTICAL) {
    int active_widgets = 0;
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (!child->enabled) {
        continue;
      }
      active_widgets++;
      height += widget_get_desired_height(child, width);
    }
    if (active_widgets > 0) {
      height += (active_widgets - 1) * spacing;
    }
  } else {
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (!child->enabled) {
        continue;
      }
      height = MAX(widget_get_desired_height(child, width), height);
    }
  }
  height += widget_padding_get_padding_height(wid);
  return height;
}

static void vert_calculate_size(box *b) {
  int spacing = distance_get_pixel(b->spacing, ROFI_ORIENTATION_VERTICAL);
  int expanding_widgets = 0;
  int active_widgets = 0;
  int rem_width = widget_padding_get_remaining_width(WIDGET(b));
  int rem_height = widget_padding_get_remaining_height(WIDGET(b));
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    if (child->enabled && child->expand == FALSE) {
      widget_resize(child, rem_width,
                    widget_get_desired_height(child, rem_width));
    }
  }
  b->max_size = 0;
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    if (!child->enabled) {
      continue;
    }
    active_widgets++;
    if (child->expand == TRUE) {
      expanding_widgets++;
      continue;
    }
    if (child->h > 0) {
      b->max_size += child->h;
    }
  }
  if (active_widgets > 0) {
    b->max_size += (active_widgets - 1) * spacing;
  }
  if (b->max_size > rem_height) {
    b->max_size = rem_height;
    g_debug("Widgets to large (height) for box: %d %d", b->max_size,
            b->widget.h);
    return;
  }
  if (active_widgets > 0) {
    int top = widget_padding_get_top(WIDGET(b));
    double rem = rem_height - b->max_size;
    int index = 0;
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (child->enabled == FALSE) {
        continue;
      }
      if (child->expand == TRUE) {
        // Re-calculate to avoid round issues leaving one pixel left.
        int expanding_widgets_size = (rem) / (expanding_widgets - index);
        widget_move(child, widget_padding_get_left(WIDGET(b)), top);
        top += expanding_widgets_size;
        widget_resize(child, rem_width, expanding_widgets_size);
        top += spacing;
        rem -= expanding_widgets_size;
        index++;
      } else {
        widget_move(child, widget_padding_get_left(WIDGET(b)), top);
        top += widget_get_height(child);
        top += spacing;
      }
    }
  }
  b->max_size += widget_padding_get_padding_height(WIDGET(b));
}
static void hori_calculate_size(box *b) {
  int spacing = distance_get_pixel(b->spacing, ROFI_ORIENTATION_HORIZONTAL);
  int expanding_widgets = 0;
  int active_widgets = 0;
  int rem_width = widget_padding_get_remaining_width(WIDGET(b));
  int rem_height = widget_padding_get_remaining_height(WIDGET(b));
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    if (child->enabled && child->expand == FALSE) {
      widget_resize(child,
                    widget_get_desired_width(child, rem_height), // child->w,
                    rem_height);
    }
  }
  b->max_size = 0;
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    if (!child->enabled) {
      continue;
    }
    active_widgets++;
    if (child->expand == TRUE) {
      expanding_widgets++;
      continue;
    }
    // Size used by fixed width widgets.
    if (child->h > 0) {
      b->max_size += child->w;
    }
  }
  b->max_size += MAX(0, ((active_widgets - 1) * spacing));
  if (b->max_size > (rem_width)) {
    b->max_size = rem_width;
    g_debug("Widgets to large (width) for box: %d %d", b->max_size,
            b->widget.w);
    // return;
  }
  if (active_widgets > 0) {
    int left = widget_padding_get_left(WIDGET(b));
    double rem = rem_width - b->max_size;
    int index = 0;
    if (rem < 0) {
      rem = 0;
    }
    for (GList *iter = g_list_first(b->children); iter != NULL;
         iter = g_list_next(iter)) {
      widget *child = (widget *)iter->data;
      if (child->enabled == FALSE) {
        continue;
      }
      if (child->expand == TRUE) {
        // Re-calculate to avoid round issues leaving one pixel left.
        int expanding_widgets_size = (rem) / (expanding_widgets - index);
        widget_move(child, left, widget_padding_get_top(WIDGET(b)));
        left += expanding_widgets_size;
        widget_resize(child, expanding_widgets_size, rem_height);
        left += spacing;
        rem -= expanding_widgets_size;
        index++;
      } else {
        widget_move(child, left, widget_padding_get_top(WIDGET(b)));
        left += widget_get_width(child);
        left += spacing;
      }
    }
  }
  b->max_size += widget_padding_get_padding_width(WIDGET(b));
}

static void box_draw(widget *wid, cairo_t *draw) {
  box *b = (box *)wid;
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    widget_draw(child, draw);
  }
}

static void box_free(widget *wid) {
  box *b = (box *)wid;

  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    widget_free(child);
  }
  g_list_free(b->children);
  g_free(b);
}

void box_add(box *box, widget *child, gboolean expand) {
  if (box == NULL) {
    return;
  }
  // Make sure box is width/heigh enough.
  if (box->type == ROFI_ORIENTATION_VERTICAL) {
    int width = box->widget.w;
    width =
        MAX(width, child->w + widget_padding_get_padding_width(WIDGET(box)));
    box->widget.w = width;
  } else {
    int height = box->widget.h;
    height =
        MAX(height, child->h + widget_padding_get_padding_height(WIDGET(box)));
    box->widget.h = height;
  }
  child->expand = rofi_theme_get_boolean(child, "expand", expand);
  g_assert(child->parent == WIDGET(box));
  box->children = g_list_append(box->children, (void *)child);
  widget_update(WIDGET(box));
}

static void box_resize(widget *widget, short w, short h) {
  box *b = (box *)widget;
  if (b->widget.w != w || b->widget.h != h) {
    b->widget.w = w;
    b->widget.h = h;
    widget_update(widget);
  }
}

static widget *box_find_mouse_target(widget *wid, WidgetType type, gint x,
                                     gint y) {
  box *b = (box *)wid;
  for (GList *iter = g_list_first(b->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    if (!child->enabled) {
      continue;
    }
    if (widget_intersect(child, x, y)) {
      gint rx = x - child->x;
      gint ry = y - child->y;
      widget *target = widget_find_mouse_target(child, type, rx, ry);
      if (target != NULL) {
        return target;
      }
    }
  }
  return NULL;
}

static void box_set_state(widget *wid, const char *state) {
  for (GList *iter = g_list_first(((box *)wid)->children); iter != NULL;
       iter = g_list_next(iter)) {
    widget *child = (widget *)iter->data;
    widget_set_state(child, state);
  }
}

box *box_create(widget *parent, const char *name, RofiOrientation type) {
  box *b = g_malloc0(sizeof(box));
  // Initialize widget.
  widget_init(WIDGET(b), parent, WIDGET_TYPE_UNKNOWN, name);
  b->type = type;
  b->widget.draw = box_draw;
  b->widget.free = box_free;
  b->widget.resize = box_resize;
  b->widget.update = box_update;
  b->widget.find_mouse_target = box_find_mouse_target;
  b->widget.get_desired_height = box_get_desired_height;
  b->widget.get_desired_width = box_get_desired_width;
  b->widget.set_state = box_set_state;

  b->type = rofi_theme_get_orientation(WIDGET(b), "orientation", b->type);

  b->spacing = rofi_theme_get_distance(WIDGET(b), "spacing", DEFAULT_SPACING);
  return b;
}

static void box_update(widget *wid) {
  box *b = (box *)wid;
  switch (b->type) {
  case ROFI_ORIENTATION_VERTICAL:
    vert_calculate_size(b);
    break;
  case ROFI_ORIENTATION_HORIZONTAL:
  default:
    hori_calculate_size(b);
  }
  if (wid->parent) {
    widget_update(wid->parent);
  }
}
