/*
 *
 * Conky, a system monitor, based on torsmo
 *
 * Any original torsmo code is licensed under the BSD license
 *
 * All code written since the fork of torsmo is licensed under the GPL
 *
 * Please see COPYING for details
 *
 * Copyright (c) 2004, Hannu Saransaari and Lauri Hakkarainen
 * Copyright (c) 2005-2018 Brenden Matthews, Philip Kovacs, et. al.
 *	(see AUTHORS)
 * All rights reserved.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "common.h"
#include "config.h"
#include "conky.h"
#include "logging.h"

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xmd.h>
#include <X11/Xutil.h>
#include "x11.h"
#ifdef BUILD_IMLIB2
#include "imlib2.h"
#endif /* BUILD_IMLIB2 */
#ifndef OWN_WINDOW
#include <iostream>
#endif
#ifdef BUILD_XFT
#include <X11/Xft/Xft.h>
#endif
#ifdef BUILD_XINERAMA
#include <X11/extensions/Xinerama.h>
#endif

#ifdef BUILD_ARGB
bool have_argb_visual;
#endif /* BUILD_ARGB */

/* some basic X11 stuff */
Display *display = NULL;
int display_width;
int display_height;
int screen;

/* workarea from _NET_WORKAREA, this is where window / text is aligned */
int workarea[4];

/* Window stuff */
struct conky_window window;
char window_created = 0;

/* local prototypes */
static void update_workarea(void);
static Window find_desktop_window(Window *p_root, Window *p_desktop);
static Window find_subwindow(Window win, int w, int h);
static void init_X11();
static void deinit_X11();
static void init_window(lua::state &l, bool own);

/********************* <SETTINGS> ************************/
namespace priv {
void out_to_x_setting::lua_setter(lua::state &l, bool init) {
  lua::stack_sentry s(l, -2);

  Base::lua_setter(l, init);

  if (init && do_convert(l, -1).first) init_X11();

  ++s;
}

void out_to_x_setting::cleanup(lua::state &l) {
  lua::stack_sentry s(l, -1);

  if (do_convert(l, -1).first) deinit_X11();

  l.pop();
}

void own_window_setting::lua_setter(lua::state &l, bool init) {
  lua::stack_sentry s(l, -2);

  Base::lua_setter(l, init);

  if (init) {
    if (do_convert(l, -1).first) {
#ifndef OWN_WINDOW
      std::cerr << "Support for the own_window setting has been "
                   "disabled during compilation\n";
      l.pop();
      l.pushboolean(false);
#endif
    }

    if (out_to_x.get(l))
      init_window(l, do_convert(l, -1).first);
    else {
      // own_window makes no sense when not drawing to X
      l.pop();
      l.pushboolean(false);
    }
  }

  ++s;
}

#ifdef BUILD_XDBE
bool use_xdbe_setting::set_up(lua::state &l) {
  // double_buffer makes no sense when not drawing to X
  if (not out_to_x.get(l)) return false;

  int major, minor;

  if (not XdbeQueryExtension(display, &major, &minor)) {
    NORM_ERR("No compatible double buffer extension found");
    return false;
  }

  window.back_buffer =
      XdbeAllocateBackBufferName(display, window.window, XdbeBackground);
  if (window.back_buffer != None) {
    window.drawable = window.back_buffer;
  } else {
    NORM_ERR("Failed to allocate back buffer");
    return false;
  }

  XFlush(display);
  return true;
}

void use_xdbe_setting::lua_setter(lua::state &l, bool init) {
  lua::stack_sentry s(l, -2);

  Base::lua_setter(l, init);

  if (init && do_convert(l, -1).first) {
    if (not set_up(l)) {
      l.pop();
      l.pushboolean(false);
    }

    fprintf(stderr, PACKAGE_NAME ": drawing to %s buffer\n",
            do_convert(l, -1).first ? "double" : "single");
  }

  ++s;
}

#else
bool use_xpmdb_setting::set_up(lua::state &l) {
  // double_buffer makes no sense when not drawing to X
  if (not out_to_x.get(l)) return false;

  window.back_buffer =
      XCreatePixmap(display, window.window, window.width + 1, window.height + 1,
                    DefaultDepth(display, screen));
  if (window.back_buffer != None) {
    window.drawable = window.back_buffer;
  } else {
    NORM_ERR("Failed to allocate back buffer");
    return false;
  }

  XFlush(display);
  return true;
}

void use_xpmdb_setting::lua_setter(lua::state &l, bool init) {
  lua::stack_sentry s(l, -2);

  Base::lua_setter(l, init);

  if (init && do_convert(l, -1).first) {
    if (not set_up(l)) {
      l.pop();
      l.pushboolean(false);
    }

    fprintf(stderr, PACKAGE_NAME ": drawing to %s buffer\n",
            do_convert(l, -1).first ? "double" : "single");
  }

  ++s;
}
#endif

void colour_setting::lua_setter(lua::state &l, bool init) {
  lua::stack_sentry s(l, -2);

  if (not out_to_x.get(l)) {
    // ignore if we're not using X
    l.replace(-2);
  } else
    Base::lua_setter(l, init);

  ++s;
}
}  // namespace priv

template <>
conky::lua_traits<alignment>::Map conky::lua_traits<alignment>::map = {
    {"top_left", TOP_LEFT},
    {"top_right", TOP_RIGHT},
    {"top_middle", TOP_MIDDLE},
    {"bottom_left", BOTTOM_LEFT},
    {"bottom_right", BOTTOM_RIGHT},
    {"bottom_middle", BOTTOM_MIDDLE},
    {"middle_left", MIDDLE_LEFT},
    {"middle_middle", MIDDLE_MIDDLE},
    {"middle_right", MIDDLE_RIGHT},
    {"tl", TOP_LEFT},
    {"tr", TOP_RIGHT},
    {"tm", TOP_MIDDLE},
    {"bl", BOTTOM_LEFT},
    {"br", BOTTOM_RIGHT},
    {"bm", BOTTOM_MIDDLE},
    {"ml", MIDDLE_LEFT},
    {"mm", MIDDLE_MIDDLE},
    {"mr", MIDDLE_RIGHT},
    {"none", NONE}};

#ifdef OWN_WINDOW
template <>
conky::lua_traits<window_type>::Map conky::lua_traits<window_type>::map = {
    {"normal", TYPE_NORMAL},
    {"dock", TYPE_DOCK},
    {"panel", TYPE_PANEL},
    {"desktop", TYPE_DESKTOP},
    {"override", TYPE_OVERRIDE}};

template <>
conky::lua_traits<window_hints>::Map conky::lua_traits<window_hints>::map = {
    {"undecorated", HINT_UNDECORATED},
    {"below", HINT_BELOW},
    {"above", HINT_ABOVE},
    {"sticky", HINT_STICKY},
    {"skip_taskbar", HINT_SKIP_TASKBAR},
    {"skip_pager", HINT_SKIP_PAGER}};

std::pair<uint16_t, bool> window_hints_traits::convert(
    lua::state &l, int index, const std::string &name) {
  typedef conky::lua_traits<window_hints> Traits;

  lua::stack_sentry s(l);
  l.checkstack(1);

  std::string hints = l.tostring(index);
  // add a sentinel to simplify the following loop
  hints += ',';
  size_t pos = 0;
  size_t newpos;
  uint16_t ret = 0;
  while ((newpos = hints.find_first_of(", ", pos)) != std::string::npos) {
    if (newpos > pos) {
      l.pushstring(hints.substr(pos, newpos - pos));
      auto t = conky::lua_traits<window_hints>::convert(l, -1, name);
      if (not t.second) return {0, false};
      SET_HINT(ret, t.first);
      l.pop();
    }
    pos = newpos + 1;
  }
  return {ret, true};
}
#endif

namespace {
// used to set the default value for own_window_title
std::string gethostnamecxx() {
  update_uname();
  return info.uname_s.nodename;
}
}  // namespace

/*
 * The order of these settings cannot be completely arbitrary. Some of them
 * depend on others, and the setters are called in the order in which they are
 * defined. The order should be: display_name -> out_to_x -> everything colour
 * related
 *                          -> border_*, own_window_*, etc -> own_window ->
 * double_buffer ->  imlib_cache_size
 */

conky::simple_config_setting<alignment> text_alignment("alignment", BOTTOM_LEFT,
                                                       false);
conky::simple_config_setting<std::string> display_name("display", std::string(),
                                                       false);
static conky::simple_config_setting<int> head_index("xinerama_head", 0, true);
priv::out_to_x_setting out_to_x;

priv::colour_setting color[10] = {{"color0", 0xffffff}, {"color1", 0xffffff},
                                  {"color2", 0xffffff}, {"color3", 0xffffff},
                                  {"color4", 0xffffff}, {"color5", 0xffffff},
                                  {"color6", 0xffffff}, {"color7", 0xffffff},
                                  {"color8", 0xffffff}, {"color9", 0xffffff}};
priv::colour_setting default_color("default_color", 0xffffff);
priv::colour_setting default_shade_color("default_shade_color", 0x000000);
priv::colour_setting default_outline_color("default_outline_color", 0x000000);

conky::range_config_setting<int> border_inner_margin(
    "border_inner_margin", 0, std::numeric_limits<int>::max(), 3, true);
conky::range_config_setting<int> border_outer_margin(
    "border_outer_margin", 0, std::numeric_limits<int>::max(), 1, true);
conky::range_config_setting<int> border_width("border_width", 0,
                                              std::numeric_limits<int>::max(),
                                              1, true);
#ifdef BUILD_XFT
conky::simple_config_setting<bool> use_xft("use_xft", false, false);
#endif

#ifdef OWN_WINDOW
conky::simple_config_setting<bool> set_transparent("own_window_transparent",
                                                   false, false);
conky::simple_config_setting<std::string> own_window_class("own_window_class",
                                                           PACKAGE_NAME, false);

conky::simple_config_setting<std::string> own_window_title(
    "own_window_title", PACKAGE_NAME " (" + gethostnamecxx() + ")", false);

conky::simple_config_setting<window_type> own_window_type("own_window_type",
                                                          TYPE_NORMAL, false);
conky::simple_config_setting<uint16_t, window_hints_traits> own_window_hints(
    "own_window_hints", 0, false);

priv::colour_setting background_colour("own_window_colour", 0);

#ifdef BUILD_ARGB
conky::simple_config_setting<bool> use_argb_visual("own_window_argb_visual",
                                                   false, false);
conky::range_config_setting<int> own_window_argb_value("own_window_argb_value",
                                                       0, 255, 255, false);
#endif
#endif /*OWN_WINDOW*/
priv::own_window_setting own_window;

#ifdef BUILD_XDBE
priv::use_xdbe_setting use_xdbe;
#else
priv::use_xpmdb_setting use_xpmdb;
#endif

#ifdef BUILD_IMLIB2
/*
 * the only reason this is not in imlib2.cc is so that we can be sure it's
 * setter executes after use_xdbe
 */
imlib_cache_size_setting imlib_cache_size;
#endif
/******************** </SETTINGS> ************************/

#ifdef DEBUG
/* WARNING, this type not in Xlib spec */
static int __attribute__((noreturn))
x11_error_handler(Display *d, XErrorEvent *err) {
  NORM_ERR(
      "X Error: type %i Display %lx XID %li serial %lu error_code %i "
      "request_code %i minor_code %i other Display: %lx\n",
      err->type, (long unsigned)err->display, (long)err->resourceid,
      err->serial, err->error_code, err->request_code, err->minor_code,
      (long unsigned)d);
  abort();
}

static int __attribute__((noreturn)) x11_ioerror_handler(Display *d) {
  NORM_ERR("X Error: Display %lx\n", (long unsigned)d);
  exit(1);
}
#endif /* DEBUG */

/* X11 initializer */
static void init_X11() {
  if (!display) {
    const std::string &dispstr = display_name.get(*state).c_str();
    // passing NULL to XOpenDisplay should open the default display
    const char *disp = dispstr.size() ? dispstr.c_str() : NULL;
    if ((display = XOpenDisplay(disp)) == NULL) {
      throw std::runtime_error(std::string("can't open display: ") +
                               XDisplayName(disp));
    }
  }

  info.x11.monitor.number = 1;
  info.x11.monitor.current = 0;
  info.x11.desktop.current = 1;
  info.x11.desktop.number = 1;
  info.x11.desktop.all_names.clear();
  info.x11.desktop.name.clear();

  screen = DefaultScreen(display);
  display_width = DisplayWidth(display, screen);
  display_height = DisplayHeight(display, screen);

  get_x11_desktop_info(display, 0);

  update_workarea();

#ifdef DEBUG
  _Xdebug = 1;
  /* WARNING, this type not in Xlib spec */
  XSetErrorHandler(&x11_error_handler);
  XSetIOErrorHandler(&x11_ioerror_handler);
#endif /* DEBUG */
}

static void deinit_X11() {
  XCloseDisplay(display);
  display = NULL;
}

static void update_workarea(void) {
  /* default work area is display */
  workarea[0] = 0;
  workarea[1] = 0;
  workarea[2] = display_width;
  workarea[3] = display_height;

#ifdef BUILD_XINERAMA
  /* if xinerama is being used, adjust workarea to the head's area */
  int useless1, useless2;
  if (!XineramaQueryExtension(display, &useless1, &useless2)) {
    return; /* doesn't even have xinerama */
  }

  if (!XineramaIsActive(display)) {
    return; /* has xinerama but isn't using it */
  }

  int heads = 0;
  XineramaScreenInfo *si = XineramaQueryScreens(display, &heads);
  if (!si) {
    NORM_ERR(
        "warning: XineramaQueryScreen returned NULL, ignoring head settings");
    return; /* queryscreens failed? */
  }

  int i = head_index.get(*state);
  if (i < 0 || i >= heads) {
    NORM_ERR("warning: invalid head index, ignoring head settings");
    return;
  }

  XineramaScreenInfo *ps = &si[i];
  workarea[0] = ps->x_org;
  workarea[1] = ps->y_org;
  workarea[2] = workarea[0] + ps->width;
  workarea[3] = workarea[1] + ps->height;
  XFree(si);

  DBGP("Fixed xinerama area to: %d %d %d %d", workarea[0], workarea[1],
       workarea[2], workarea[3]);
#endif
}

/* Find root window and desktop window.
 * Return desktop window on success,
 * and set root and desktop byref return values.
 * Return 0 on failure. */
static Window find_desktop_window(Window *p_root, Window *p_desktop) {
  Atom type;
  int format, i;
  unsigned long nitems, bytes;
  unsigned int n;
  Window root = RootWindow(display, screen);
  Window win = root;
  Window troot, parent, *children;
  unsigned char *buf = NULL;

  if (!p_root || !p_desktop) {
    return 0;
  }

  /* some window managers set __SWM_VROOT to some child of root window */

  XQueryTree(display, root, &troot, &parent, &children, &n);
  for (i = 0; i < (int)n; i++) {
    if (XGetWindowProperty(display, children[i], ATOM(__SWM_VROOT), 0, 1, False,
                           XA_WINDOW, &type, &format, &nitems, &bytes,
                           &buf) == Success &&
        type == XA_WINDOW) {
      win = *(Window *)buf;
      XFree(buf);
      XFree(children);
      fprintf(stderr,
              PACKAGE_NAME
              ": desktop window (%lx) found from __SWM_VROOT property\n",
              win);
      fflush(stderr);
      *p_root = win;
      *p_desktop = win;
      return win;
    }

    if (buf) {
      XFree(buf);
      buf = 0;
    }
  }
  XFree(children);

  /* get subwindows from root */
  win = find_subwindow(root, -1, -1);

  update_workarea();

  win = find_subwindow(win, workarea[2], workarea[3]);

  if (buf) {
    XFree(buf);
    buf = 0;
  }

  if (win != root) {
    fprintf(stderr,
            PACKAGE_NAME
            ": desktop window (%lx) is subwindow of root window (%lx)\n",
            win, root);
  } else {
    fprintf(stderr, PACKAGE_NAME ": desktop window (%lx) is root window\n",
            win);
  }

  fflush(stderr);

  *p_root = root;
  *p_desktop = win;

  return win;
}

#ifdef OWN_WINDOW
namespace {
/* helper function for set_transparent_background() */
void do_set_background(Window win, int argb) {
  unsigned long colour = background_colour.get(*state) | (argb << 24);
  XSetWindowBackground(display, win, colour);
}
}  // namespace

/* if no argb visual is configured sets background to ParentRelative for the
   Window and all parents, else real transparency is used */
void set_transparent_background(Window win) {
#ifdef BUILD_ARGB
  if (have_argb_visual) {
    // real transparency
    do_set_background(win, set_transparent.get(*state)
                               ? 0
                               : own_window_argb_value.get(*state));
  } else {
#endif /* BUILD_ARGB */
    // pseudo transparency

    if (set_transparent.get(*state)) {
      Window parent = win;
      unsigned int i;

      for (i = 0; i < 50 && parent != RootWindow(display, screen); i++) {
        Window r, *children;
        unsigned int n;

        XSetWindowBackgroundPixmap(display, parent, ParentRelative);

        XQueryTree(display, parent, &r, &parent, &children, &n);
        XFree(children);
      }
    } else
      do_set_background(win, 0);
#ifdef BUILD_ARGB
  }
#endif /* BUILD_ARGB */
}
#endif

#ifdef BUILD_ARGB
static int get_argb_visual(Visual **visual, int *depth) {
  /* code from gtk project, gdk_screen_get_rgba_visual */
  XVisualInfo visual_template;
  XVisualInfo *visual_list;
  int nxvisuals = 0, i;

  visual_template.screen = screen;
  visual_list =
      XGetVisualInfo(display, VisualScreenMask, &visual_template, &nxvisuals);
  for (i = 0; i < nxvisuals; i++) {
    if (visual_list[i].depth == 32 && (visual_list[i].red_mask == 0xff0000 &&
                                       visual_list[i].green_mask == 0x00ff00 &&
                                       visual_list[i].blue_mask == 0x0000ff)) {
      *visual = visual_list[i].visual;
      *depth = visual_list[i].depth;
      DBGP("Found ARGB Visual");
      XFree(visual_list);
      return 1;
    }
  }
  // no argb visual available
  DBGP("No ARGB Visual found");
  XFree(visual_list);
  return 0;
}
#endif /* BUILD_ARGB */

void destroy_window(void) {
#ifdef BUILD_XFT
  if (window.xftdraw) {
    XftDrawDestroy(window.xftdraw);
  }
#endif /* BUILD_XFT */
  if (window.gc) {
    XFreeGC(display, window.gc);
  }
  memset(&window, 0, sizeof(struct conky_window));
}

static void init_window(lua::state &l __attribute__((unused)), bool own) {
  // own is unused if OWN_WINDOW is not defined
  (void)own;

  window_created = 1;

#ifdef OWN_WINDOW
  if (own) {
    int depth = 0, flags = CWOverrideRedirect | CWBackingStore;
    Visual *visual = NULL;

    if (!find_desktop_window(&window.root, &window.desktop)) {
      return;
    }

#ifdef BUILD_ARGB
    if (use_argb_visual.get(l) && get_argb_visual(&visual, &depth)) {
      have_argb_visual = true;
      window.visual = visual;
      window.colourmap = XCreateColormap(display, DefaultRootWindow(display),
                                         window.visual, AllocNone);
    } else {
#endif /* BUILD_ARGB */
      window.visual = DefaultVisual(display, screen);
      window.colourmap = DefaultColormap(display, screen);
      depth = CopyFromParent;
      visual = CopyFromParent;
#ifdef BUILD_ARGB
    }
#endif /* BUILD_ARGB */

    int b = border_inner_margin.get(l) + border_width.get(l) +
            border_outer_margin.get(l);

    /* Sanity check to avoid making an invalid 0x0 window */
    if (b == 0) {
      b = 1;
    }

    if (own_window_type.get(l) == TYPE_OVERRIDE) {
      /* An override_redirect True window.
       * No WM hints or button processing needed. */
      XSetWindowAttributes attrs = {ParentRelative,
                                    0L,
                                    0,
                                    0L,
                                    0,
                                    0,
                                    Always,
                                    0L,
                                    0L,
                                    False,
                                    StructureNotifyMask | ExposureMask,
                                    0L,
                                    True,
                                    0,
                                    0};
#ifdef BUILD_ARGB
      if (have_argb_visual) {
        attrs.colormap = window.colourmap;
        flags |= CWBorderPixel | CWColormap;
      } else {
#endif /* BUILD_ARGB */
        flags |= CWBackPixel;
#ifdef BUILD_ARGB
      }
#endif /* BUILD_ARGB */

      /* Parent is desktop window (which might be a child of root) */
      window.window =
          XCreateWindow(display, window.desktop, window.x, window.y, b, b, 0,
                        depth, InputOutput, visual, flags, &attrs);

      XLowerWindow(display, window.window);

      fprintf(stderr, PACKAGE_NAME ": window type - override\n");
      fflush(stderr);
    } else { /* own_window_type.get(l) != TYPE_OVERRIDE */

      /* A window managed by the window manager.
       * Process hints and buttons. */
      XSetWindowAttributes attrs = {ParentRelative,
                                    0L,
                                    0,
                                    0L,
                                    0,
                                    0,
                                    Always,
                                    0L,
                                    0L,
                                    False,
                                    StructureNotifyMask | ExposureMask |
                                        ButtonPressMask | ButtonReleaseMask,
                                    0L,
                                    False,
                                    0,
                                    0};

      XClassHint classHint;
      XWMHints wmHint;
      Atom xa;

#ifdef BUILD_ARGB
      if (have_argb_visual) {
        attrs.colormap = window.colourmap;
        flags |= CWBorderPixel | CWColormap;
      } else {
#endif /* BUILD_ARGB */
        flags |= CWBackPixel;
#ifdef BUILD_ARGB
      }
#endif /* BUILD_ARGB */

      if (own_window_type.get(l) == TYPE_DOCK) {
        window.x = window.y = 0;
      }
      /* Parent is root window so WM can take control */
      window.window =
          XCreateWindow(display, window.root, window.x, window.y, b, b, 0,
                        depth, InputOutput, visual, flags, &attrs);

      // class_name must be a named local variable, so that c_str() remains
      // valid until we call XmbSetWMProperties(). We use const_cast because,
      // for whatever reason, res_name is not declared as const char *.
      // XmbSetWMProperties hopefully doesn't modify the value (hell, even their
      // own example app assigns a literal string constant to the field)
      const std::string &class_name = own_window_class.get(l);

      classHint.res_name = const_cast<char *>(class_name.c_str());
      classHint.res_class = classHint.res_name;

      uint16_t hints = own_window_hints.get(l);

      wmHint.flags = InputHint | StateHint;
      /* allow decorated windows to be given input focus by WM */
      wmHint.input = TEST_HINT(hints, HINT_UNDECORATED) ? False : True;
      if (own_window_type.get(l) == TYPE_DOCK ||
          own_window_type.get(l) == TYPE_PANEL) {
        wmHint.initial_state = WithdrawnState;
      } else {
        wmHint.initial_state = NormalState;
      }

      XmbSetWMProperties(display, window.window, NULL, NULL, argv_copy,
                         argc_copy, NULL, &wmHint, &classHint);
      XStoreName(display, window.window, own_window_title.get(l).c_str());

      /* Sets an empty WM_PROTOCOLS property */
      XSetWMProtocols(display, window.window, NULL, 0);

      /* Set window type */
      if ((xa = ATOM(_NET_WM_WINDOW_TYPE)) != None) {
        Atom prop;

        switch (own_window_type.get(l)) {
          case TYPE_DESKTOP:
            prop = ATOM(_NET_WM_WINDOW_TYPE_DESKTOP);
            fprintf(stderr, PACKAGE_NAME ": window type - desktop\n");
            fflush(stderr);
            break;
          case TYPE_DOCK:
            prop = ATOM(_NET_WM_WINDOW_TYPE_DOCK);
            fprintf(stderr, PACKAGE_NAME ": window type - dock\n");
            fflush(stderr);
            break;
          case TYPE_PANEL:
            prop = ATOM(_NET_WM_WINDOW_TYPE_DOCK);
            fprintf(stderr, PACKAGE_NAME ": window type - panel\n");
            fflush(stderr);
            break;
          case TYPE_NORMAL:
          default:
            prop = ATOM(_NET_WM_WINDOW_TYPE_NORMAL);
            fprintf(stderr, PACKAGE_NAME ": window type - normal\n");
            fflush(stderr);
            break;
        }
        XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                        PropModeReplace, (unsigned char *)&prop, 1);
      }

      /* Set desired hints */

      /* Window decorations */
      if (TEST_HINT(hints, HINT_UNDECORATED)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - undecorated\n");
           fflush(stderr); */

        xa = ATOM(_MOTIF_WM_HINTS);
        if (xa != None) {
          long prop[5] = {2, 0, 0, 0, 0};
          XChangeProperty(display, window.window, xa, xa, 32, PropModeReplace,
                          (unsigned char *)prop, 5);
        }
      }

      /* Below other windows */
      if (TEST_HINT(hints, HINT_BELOW)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - below\n");
           fflush(stderr); */

        xa = ATOM(_WIN_LAYER);
        if (xa != None) {
          long prop = 0;

          XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
                          PropModeAppend, (unsigned char *)&prop, 1);
        }

        xa = ATOM(_NET_WM_STATE);
        if (xa != None) {
          Atom xa_prop = ATOM(_NET_WM_STATE_BELOW);

          XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }
      }

      /* Above other windows */
      if (TEST_HINT(hints, HINT_ABOVE)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - above\n");
           fflush(stderr); */

        xa = ATOM(_WIN_LAYER);
        if (xa != None) {
          long prop = 6;

          XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
                          PropModeAppend, (unsigned char *)&prop, 1);
        }

        xa = ATOM(_NET_WM_STATE);
        if (xa != None) {
          Atom xa_prop = ATOM(_NET_WM_STATE_ABOVE);

          XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }
      }

      /* Sticky */
      if (TEST_HINT(hints, HINT_STICKY)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - sticky\n");
           fflush(stderr); */

        xa = ATOM(_NET_WM_DESKTOP);
        if (xa != None) {
          CARD32 xa_prop = 0xFFFFFFFF;

          XChangeProperty(display, window.window, xa, XA_CARDINAL, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }

        xa = ATOM(_NET_WM_STATE);
        if (xa != None) {
          Atom xa_prop = ATOM(_NET_WM_STATE_STICKY);

          XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }
      }

      /* Skip taskbar */
      if (TEST_HINT(hints, HINT_SKIP_TASKBAR)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - skip_taskbar\n");
           fflush(stderr); */

        xa = ATOM(_NET_WM_STATE);
        if (xa != None) {
          Atom xa_prop = ATOM(_NET_WM_STATE_SKIP_TASKBAR);

          XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }
      }

      /* Skip pager */
      if (TEST_HINT(hints, HINT_SKIP_PAGER)) {
        /* fprintf(stderr, PACKAGE_NAME": hint - skip_pager\n");
           fflush(stderr); */

        xa = ATOM(_NET_WM_STATE);
        if (xa != None) {
          Atom xa_prop = ATOM(_NET_WM_STATE_SKIP_PAGER);

          XChangeProperty(display, window.window, xa, XA_ATOM, 32,
                          PropModeAppend, (unsigned char *)&xa_prop, 1);
        }
      }
    }

    fprintf(stderr, PACKAGE_NAME ": drawing to created window (0x%lx)\n",
            window.window);
    fflush(stderr);

    XMapWindow(display, window.window);

  } else
#endif /* OWN_WINDOW */
  {
    XWindowAttributes attrs;

    if (!window.window) {
      window.window = find_desktop_window(&window.root, &window.desktop);
    }
    window.visual = DefaultVisual(display, screen);
    window.colourmap = DefaultColormap(display, screen);

    if (XGetWindowAttributes(display, window.window, &attrs)) {
      window.width = attrs.width;
      window.height = attrs.height;
    }

    fprintf(stderr, PACKAGE_NAME ": drawing to desktop window\n");
  }

  /* Drawable is same as window. This may be changed by double buffering. */
  window.drawable = window.window;

  XFlush(display);

  XSelectInput(display, window.window,
               ExposureMask | PropertyChangeMask
#ifdef OWN_WINDOW
                   | (own_window.get(l) ? (StructureNotifyMask |
                                           ButtonPressMask | ButtonReleaseMask)
                                        : 0)
#endif
  );
}

static Window find_subwindow(Window win, int w, int h) {
  unsigned int i, j;
  Window troot, parent, *children;
  unsigned int n;

  /* search subwindows with same size as display or work area */

  for (i = 0; i < 10; i++) {
    XQueryTree(display, win, &troot, &parent, &children, &n);

    for (j = 0; j < n; j++) {
      XWindowAttributes attrs;

      if (XGetWindowAttributes(display, children[j], &attrs)) {
        /* Window must be mapped and same size as display or
         * work space */
        if (attrs.map_state != 0 &&
            ((attrs.width == display_width && attrs.height == display_height) ||
             (attrs.width == w && attrs.height == h))) {
          win = children[j];
          break;
        }
      }
    }

    XFree(children);
    if (j == n) {
      break;
    }
  }

  return win;
}

void create_gc(void) {
  XGCValues values;

  values.graphics_exposures = 0;
  values.function = GXcopy;
  window.gc = XCreateGC(display, window.drawable,
                        GCFunction | GCGraphicsExposures, &values);
}

// Get current desktop number
static inline void get_x11_desktop_current(Display *current_display,
                                           Window root, Atom atom) {
  Atom actual_type;
  int actual_format;
  unsigned long nitems;
  unsigned long bytes_after;
  unsigned char *prop = NULL;
  struct information *current_info = &info;

  if (atom == None) return;

  if ((XGetWindowProperty(current_display, root, atom, 0, 1L, False,
                          XA_CARDINAL, &actual_type, &actual_format, &nitems,
                          &bytes_after, &prop) == Success) &&
      (actual_type == XA_CARDINAL) && (nitems == 1L) && (actual_format == 32)) {
    current_info->x11.desktop.current = prop[0] + 1;
  }
  if (prop) {
    XFree(prop);
  }
}

// Get total number of available desktops
static inline void get_x11_desktop_number(Display *current_display, Window root,
                                          Atom atom) {
  Atom actual_type;
  int actual_format;
  unsigned long nitems;
  unsigned long bytes_after;
  unsigned char *prop = NULL;
  struct information *current_info = &info;

  if (atom == None) return;

  if ((XGetWindowProperty(current_display, root, atom, 0, 1L, False,
                          XA_CARDINAL, &actual_type, &actual_format, &nitems,
                          &bytes_after, &prop) == Success) &&
      (actual_type == XA_CARDINAL) && (nitems == 1L) && (actual_format == 32)) {
    current_info->x11.desktop.number = prop[0];
  }
  if (prop) {
    XFree(prop);
  }
}

// Get all desktop names
static inline void get_x11_desktop_names(Display *current_display, Window root,
                                         Atom atom) {
  Atom actual_type;
  int actual_format;
  unsigned long nitems;
  unsigned long bytes_after;
  unsigned char *prop = NULL;
  struct information *current_info = &info;

  if (atom == None) return;

  if ((XGetWindowProperty(current_display, root, atom, 0, (~0L), False,
                          ATOM(UTF8_STRING), &actual_type, &actual_format,
                          &nitems, &bytes_after, &prop) == Success) &&
      (actual_type == ATOM(UTF8_STRING)) && (nitems > 0L) &&
      (actual_format == 8)) {
    current_info->x11.desktop.all_names.assign(
        reinterpret_cast<const char *>(prop), nitems);
  }
  if (prop) {
    XFree(prop);
  }
}

// Get current desktop name
static inline void get_x11_desktop_current_name(const std::string &names) {
  struct information *current_info = &info;
  unsigned int i = 0, j = 0;
  int k = 0;

  while (i < names.size()) {
    if (names[i++] == '\0') {
      if (++k == current_info->x11.desktop.current) {
        current_info->x11.desktop.name.assign(names.c_str() + j);
        break;
      }
      j = i;
    }
  }
}

void get_x11_desktop_info(Display *current_display, Atom atom) {
  Window root;
  static Atom atom_current, atom_number, atom_names;
  struct information *current_info = &info;
  XWindowAttributes window_attributes;

  root = RootWindow(current_display, current_info->x11.monitor.current);

  /* Check if we initialise else retrieve changed property */
  if (atom == 0) {
    atom_current = XInternAtom(current_display, "_NET_CURRENT_DESKTOP", True);
    atom_number = XInternAtom(current_display, "_NET_NUMBER_OF_DESKTOPS", True);
    atom_names = XInternAtom(current_display, "_NET_DESKTOP_NAMES", True);
    get_x11_desktop_current(current_display, root, atom_current);
    get_x11_desktop_number(current_display, root, atom_number);
    get_x11_desktop_names(current_display, root, atom_names);
    get_x11_desktop_current_name(current_info->x11.desktop.all_names);

    /* Set the PropertyChangeMask on the root window, if not set */
    XGetWindowAttributes(display, root, &window_attributes);
    if (!(window_attributes.your_event_mask & PropertyChangeMask)) {
      XSetWindowAttributes attributes;
      attributes.event_mask =
          window_attributes.your_event_mask | PropertyChangeMask;
      XChangeWindowAttributes(display, root, CWEventMask, &attributes);
      XGetWindowAttributes(display, root, &window_attributes);
    }
  } else {
    if (atom == atom_current) {
      get_x11_desktop_current(current_display, root, atom_current);
      get_x11_desktop_current_name(current_info->x11.desktop.all_names);
    } else if (atom == atom_number) {
      get_x11_desktop_number(current_display, root, atom_number);
    } else if (atom == atom_names) {
      get_x11_desktop_names(current_display, root, atom_names);
      get_x11_desktop_current_name(current_info->x11.desktop.all_names);
    }
  }
}

static const char NOT_IN_X[] = "Not running in X";

void print_monitor(struct text_object *obj, char *p, int p_max_size) {
  (void)obj;

  if (not out_to_x.get(*state)) {
    strncpy(p, NOT_IN_X, p_max_size);
    return;
  }
  snprintf(p, p_max_size, "%d", XDefaultScreen(display));
}

void print_monitor_number(struct text_object *obj, char *p, int p_max_size) {
  (void)obj;

  if (not out_to_x.get(*state)) {
    strncpy(p, NOT_IN_X, p_max_size);
    return;
  }
  snprintf(p, p_max_size, "%d", XScreenCount(display));
}

void print_desktop(struct text_object *obj, char *p, int p_max_size) {
  (void)obj;

  if (not out_to_x.get(*state)) {
    strncpy(p, NOT_IN_X, p_max_size);
    return;
  }
  snprintf(p, p_max_size, "%d", info.x11.desktop.current);
}

void print_desktop_number(struct text_object *obj, char *p, int p_max_size) {
  (void)obj;

  if (not out_to_x.get(*state)) {
    strncpy(p, NOT_IN_X, p_max_size);
    return;
  }
  snprintf(p, p_max_size, "%d", info.x11.desktop.number);
}

void print_desktop_name(struct text_object *obj, char *p, int p_max_size) {
  (void)obj;

  if (not out_to_x.get(*state)) {
    strncpy(p, NOT_IN_X, p_max_size);
  } else {
    strncpy(p, info.x11.desktop.name.c_str(), p_max_size);
  }
}

#ifdef OWN_WINDOW
/* reserve window manager space */
void set_struts(int sidenum) {
  Atom strut;
  if ((strut = ATOM(_NET_WM_STRUT)) != None) {
    /* reserve space at left, right, top, bottom */
    signed long sizes[12] = {0};
    int i;

    /* define strut depth */
    switch (sidenum) {
      case 0:
        /* left side */
        sizes[0] = window.x + window.width;
        break;
      case 1:
        /* right side */
        sizes[1] = display_width - window.x;
        break;
      case 2:
        /* top side */
        sizes[2] = window.y + window.height;
        break;
      case 3:
        /* bottom side */
        sizes[3] = display_height - window.y;
        break;
    }

    /* define partial strut length */
    if (sidenum <= 1) {
      sizes[4 + (sidenum * 2)] = window.y;
      sizes[5 + (sidenum * 2)] = window.y + window.height;
    } else if (sidenum <= 3) {
      sizes[4 + (sidenum * 2)] = window.x;
      sizes[5 + (sidenum * 2)] = window.x + window.width;
    }

    /* check constraints */
    for (i = 0; i < 12; i++) {
      if (sizes[i] < 0) {
        sizes[i] = 0;
      } else {
        if (i <= 1 || i >= 8) {
          if (sizes[i] > display_width) {
            sizes[i] = display_width;
          }
        } else {
          if (sizes[i] > display_height) {
            sizes[i] = display_height;
          }
        }
      }
    }

    XChangeProperty(display, window.window, strut, XA_CARDINAL, 32,
                    PropModeReplace, (unsigned char *)&sizes, 4);

    if ((strut = ATOM(_NET_WM_STRUT_PARTIAL)) != None) {
      XChangeProperty(display, window.window, strut, XA_CARDINAL, 32,
                      PropModeReplace, (unsigned char *)&sizes, 12);
    }
  }
}
#endif /* OWN_WINDOW */

#ifdef BUILD_XDBE
void xdbe_swap_buffers(void) {
  if (use_xdbe.get(*state)) {
    XdbeSwapInfo swap;

    swap.swap_window = window.window;
    swap.swap_action = XdbeBackground;
    XdbeSwapBuffers(display, &swap, 1);
  }
}
#else
void xpmdb_swap_buffers(void) {
  if (use_xpmdb.get(*state)) {
    XCopyArea(display, window.back_buffer, window.window, window.gc, 0, 0,
              window.width, window.height, 0, 0);
    XSetForeground(display, window.gc, 0);
    XFillRectangle(display, window.drawable, window.gc, 0, 0, window.width,
                   window.height);
    XFlush(display);
  }
}
#endif /* BUILD_XDBE */