/*
 * rofi
 *
 * MIT/X11 License
 * Copyright © 2013-2022 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 dialog. */
#define G_LOG_DOMAIN "Modes.Window"

#include <config.h>

#ifdef WINDOW_MODE

#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <xcb/xcb.h>
#include <xcb/xcb_atom.h>
#include <xcb/xcb_ewmh.h>
#include <xcb/xcb_icccm.h>

#include <glib.h>

#include "xcb-internal.h"
#include "xcb.h"

#include "helper.h"
#include "modes/window.h"
#include "rofi.h"
#include "settings.h"
#include "widgets/textbox.h"

#include "timings.h"

#include "mode-private.h"
#include "rofi-icon-fetcher.h"

#define WINLIST 32

#define CLIENTSTATE 10
#define CLIENTWINDOWTYPE 10

// Fields to match in window mode
typedef struct {
  char *field_name;
  gboolean enabled;
} WinModeField;

typedef enum {
  WIN_MATCH_FIELD_TITLE,
  WIN_MATCH_FIELD_CLASS,
  WIN_MATCH_FIELD_ROLE,
  WIN_MATCH_FIELD_NAME,
  WIN_MATCH_FIELD_DESKTOP,
  WIN_MATCH_NUM_FIELDS,
} WinModeMatchingFields;

static WinModeField matching_window_fields[WIN_MATCH_NUM_FIELDS] = {
    {
        .field_name = "title",
        .enabled = TRUE,
    },
    {
        .field_name = "class",
        .enabled = TRUE,
    },
    {
        .field_name = "role",
        .enabled = TRUE,
    },
    {
        .field_name = "name",
        .enabled = TRUE,
    },
    {
        .field_name = "desktop",
        .enabled = TRUE,
    }};

static gboolean window_matching_fields_parsed = FALSE;

// a manageable window
typedef struct {
  xcb_window_t window;
  xcb_get_window_attributes_reply_t xattr;
  char *title;
  char *class;
  char *name;
  char *role;
  int states;
  xcb_atom_t state[CLIENTSTATE];
  int window_types;
  xcb_atom_t window_type[CLIENTWINDOWTYPE];
  int active;
  int demands;
  long hint_flags;
  uint32_t wmdesktop;
  char *wmdesktopstr;
  unsigned int wmdesktopstr_len;
  cairo_surface_t *icon;
  gboolean icon_checked;
  uint32_t icon_fetch_uid;
  uint32_t icon_fetch_size;
  gboolean thumbnail_checked;
} client;

// window lists
typedef struct {
  xcb_window_t *array;
  client **data;
  int len;
} winlist;

typedef struct {
  unsigned int id;
  winlist *ids;
  // Current window.
  unsigned int index;
  char *cache;
  unsigned int wmdn_len;
  unsigned int clf_len;
  unsigned int name_len;
  unsigned int title_len;
  unsigned int role_len;
  GRegex *window_regex;
} WindowModePrivateData;

winlist *cache_client = NULL;

/**
 * Create a window list, pre-seeded with WINLIST entries.
 *
 * @returns A new window list.
 */
static winlist *winlist_new() {
  winlist *l = g_malloc(sizeof(winlist));
  l->len = 0;
  l->array = g_malloc_n(WINLIST + 1, sizeof(xcb_window_t));
  l->data = g_malloc_n(WINLIST + 1, sizeof(client *));
  return l;
}

/**
 * @param l The winlist.
 * @param w The window to add.
 * @param d Data pointer.
 *
 * Add one entry. If Full, extend with WINLIST entries.
 *
 * @returns 0 if failed, 1 is successful.
 */
static int winlist_append(winlist *l, xcb_window_t w, client *d) {
  if (l->len > 0 && !(l->len % WINLIST)) {
    l->array =
        g_realloc(l->array, sizeof(xcb_window_t) * (l->len + WINLIST + 1));
    l->data = g_realloc(l->data, sizeof(client *) * (l->len + WINLIST + 1));
  }
  // Make clang-check happy.
  // TODO: make clang-check clear this should never be 0.
  if (l->data == NULL || l->array == NULL) {
    return 0;
  }

  l->data[l->len] = d;
  l->array[l->len++] = w;
  return l->len - 1;
}

static void client_free(client *c) {
  if (c == NULL) {
    return;
  }
  if (c->icon) {
    cairo_surface_destroy(c->icon);
  }
  g_free(c->title);
  g_free(c->class);
  g_free(c->name);
  g_free(c->role);
  g_free(c->wmdesktopstr);
}
static void winlist_empty(winlist *l) {
  while (l->len > 0) {
    client *c = l->data[--l->len];
    if (c != NULL) {
      client_free(c);
      g_free(c);
    }
  }
}

/**
 * @param l The winlist entry
 *
 * Free the winlist.
 */
static void winlist_free(winlist *l) {
  if (l != NULL) {
    winlist_empty(l);
    g_free(l->array);
    g_free(l->data);
    g_free(l);
  }
}

/**
 * @param l The winlist.
 * @param w The window to find.
 *
 * Find the window in the list, and return the array entry.
 *
 * @returns -1 if failed, index is successful.
 */
static int winlist_find(winlist *l, xcb_window_t w) {
  if (l == NULL) {
    return -1;
  }
  // iterate backwards. Theory is: windows most often accessed will be
  // nearer the end. Testing with kcachegrind seems to support this...
  int i;

  for (i = (l->len - 1); i >= 0; i--) {
    if (l->array[i] == w) {
      return i;
    }
  }

  return -1;
}
/**
 * Create empty X11 cache for windows and windows attributes.
 */
static void x11_cache_create(void) {
  if (cache_client == NULL) {
    cache_client = winlist_new();
  }
}

/**
 * Free the cache.
 */
static void x11_cache_free(void) {
  winlist_free(cache_client);
  cache_client = NULL;
}

/**
 * @param d Display connection to X server
 * @param w window
 *
 * Get window attributes.
 * This functions uses caching.
 *
 * @returns a XWindowAttributes
 */
static xcb_get_window_attributes_reply_t *
window_get_attributes(xcb_window_t w) {
  xcb_get_window_attributes_cookie_t c =
      xcb_get_window_attributes(xcb->connection, w);
  xcb_get_window_attributes_reply_t *r =
      xcb_get_window_attributes_reply(xcb->connection, c, NULL);
  if (r) {
    return r;
  }
  return NULL;
}
// _NET_WM_STATE_*
static int client_has_state(client *c, xcb_atom_t state) {
  for (int i = 0; i < c->states; i++) {
    if (c->state[i] == state) {
      return 1;
    }
  }

  return 0;
}
static int client_has_window_type(client *c, xcb_atom_t type) {
  for (int i = 0; i < c->window_types; i++) {
    if (c->window_type[i] == type) {
      return 1;
    }
  }

  return 0;
}

static client *window_client(WindowModePrivateData *pd, xcb_window_t win) {
  if (win == XCB_WINDOW_NONE) {
    return NULL;
  }

  int idx = winlist_find(cache_client, win);

  if (idx >= 0) {
    return cache_client->data[idx];
  }

  // if this fails, we're up that creek
  xcb_get_window_attributes_reply_t *attr = window_get_attributes(win);

  if (!attr) {
    return NULL;
  }
  client *c = g_malloc0(sizeof(client));
  c->window = win;

  // copy xattr so we don't have to care when stuff is freed
  memmove(&c->xattr, attr, sizeof(xcb_get_window_attributes_reply_t));

  xcb_get_property_cookie_t cky = xcb_ewmh_get_wm_state(&xcb->ewmh, win);
  xcb_ewmh_get_atoms_reply_t states;
  if (xcb_ewmh_get_wm_state_reply(&xcb->ewmh, cky, &states, NULL)) {
    c->states = MIN(CLIENTSTATE, states.atoms_len);
    memcpy(c->state, states.atoms,
           MIN(CLIENTSTATE, states.atoms_len) * sizeof(xcb_atom_t));
    xcb_ewmh_get_atoms_reply_wipe(&states);
  }
  cky = xcb_ewmh_get_wm_window_type(&xcb->ewmh, win);
  if (xcb_ewmh_get_wm_window_type_reply(&xcb->ewmh, cky, &states, NULL)) {
    c->window_types = MIN(CLIENTWINDOWTYPE, states.atoms_len);
    memcpy(c->window_type, states.atoms,
           MIN(CLIENTWINDOWTYPE, states.atoms_len) * sizeof(xcb_atom_t));
    xcb_ewmh_get_atoms_reply_wipe(&states);
  }

  char *tmp_title = window_get_text_prop(c->window, xcb->ewmh._NET_WM_NAME);
  if (tmp_title == NULL) {
    tmp_title = window_get_text_prop(c->window, XCB_ATOM_WM_NAME);
  }
  c->title = g_markup_escape_text(tmp_title, -1);
  pd->title_len =
      MAX(c->title ? g_utf8_strlen(c->title, -1) : 0, pd->title_len);
  g_free(tmp_title);

  char *tmp_role = window_get_text_prop(c->window, netatoms[WM_WINDOW_ROLE]);
  c->role = g_markup_escape_text(tmp_role ? tmp_role : "", -1);
  pd->role_len = MAX(c->role ? g_utf8_strlen(c->role, -1) : 0, pd->role_len);
  g_free(tmp_role);

  cky = xcb_icccm_get_wm_class(xcb->connection, c->window);
  xcb_icccm_get_wm_class_reply_t wcr;
  if (xcb_icccm_get_wm_class_reply(xcb->connection, cky, &wcr, NULL)) {
    c->class = g_markup_escape_text(wcr.class_name, -1);
    c->name = g_markup_escape_text(wcr.instance_name, -1);
    pd->name_len = MAX(c->name ? g_utf8_strlen(c->name, -1) : 0, pd->name_len);
    xcb_icccm_get_wm_class_reply_wipe(&wcr);
  }

  xcb_get_property_cookie_t cc =
      xcb_icccm_get_wm_hints(xcb->connection, c->window);
  xcb_icccm_wm_hints_t r;
  if (xcb_icccm_get_wm_hints_reply(xcb->connection, cc, &r, NULL)) {
    c->hint_flags = r.flags;
  }

  winlist_append(cache_client, c->window, c);
  g_free(attr);
  return c;
}

guint window_reload_timeout = 0;
static gboolean window_client_reload(G_GNUC_UNUSED void *data) {
  window_reload_timeout = 0;
  if (window_mode.private_data) {
    window_mode._destroy(&window_mode);
    window_mode._init(&window_mode);
  }
  if (window_mode_cd.private_data) {
    window_mode._destroy(&window_mode_cd);
    window_mode._init(&window_mode_cd);
  }
  if (window_mode.private_data || window_mode_cd.private_data) {
    rofi_view_reload();
  }
  return G_SOURCE_REMOVE;
}
void window_client_handle_signal(xcb_window_t win, gboolean create) {
  //  g_idle_add_full(G_PRIORITY_HIGH_IDLE, window_client_reload, NULL, NULL);
  if (window_reload_timeout > 0) {
    g_source_remove(window_reload_timeout);
    window_reload_timeout = 0;
  }
  window_reload_timeout = g_timeout_add(100, window_client_reload, NULL);
}
static int window_match(const Mode *sw, rofi_int_matcher **tokens,
                        unsigned int index) {
  WindowModePrivateData *rmpd =
      (WindowModePrivateData *)mode_get_private_data(sw);
  int match = 1;
  const winlist *ids = (winlist *)rmpd->ids;
  // Want to pull directly out of cache, X calls are not thread safe.
  int idx = winlist_find(cache_client, ids->array[index]);
  g_assert(idx >= 0);
  client *c = cache_client->data[idx];

  if (tokens) {
    for (int j = 0; match && tokens[j] != NULL; j++) {
      int test = 0;
      // Dirty hack. Normally helper_token_match does _all_ the matching,
      // Now we want it to match only one item at the time.
      // If hack not in place it would not match queries spanning multiple
      // fields. e.g. when searching 'title element' and 'class element'
      rofi_int_matcher *ftokens[2] = {tokens[j], NULL};
      if (c->title != NULL && c->title[0] != '\0' &&
          matching_window_fields[WIN_MATCH_FIELD_TITLE].enabled) {
        test = helper_token_match(ftokens, c->title);
      }

      if (test == tokens[j]->invert && c->class != NULL &&
          c->class[0] != '\0' &&
          matching_window_fields[WIN_MATCH_FIELD_CLASS].enabled) {
        test = helper_token_match(ftokens, c->class);
      }

      if (test == tokens[j]->invert && c->role != NULL && c->role[0] != '\0' &&
          matching_window_fields[WIN_MATCH_FIELD_ROLE].enabled) {
        test = helper_token_match(ftokens, c->role);
      }

      if (test == tokens[j]->invert && c->name != NULL && c->name[0] != '\0' &&
          matching_window_fields[WIN_MATCH_FIELD_NAME].enabled) {
        test = helper_token_match(ftokens, c->name);
      }
      if (test == tokens[j]->invert && c->wmdesktopstr != NULL &&
          c->wmdesktopstr[0] != '\0' &&
          matching_window_fields[WIN_MATCH_FIELD_DESKTOP].enabled) {
        test = helper_token_match(ftokens, c->wmdesktopstr);
      }

      if (test == 0) {
        match = 0;
      }
    }
  }

  return match;
}

static void window_mode_parse_fields() {
  window_matching_fields_parsed = TRUE;
  char *savept = NULL;
  // Make a copy, as strtok will modify it.
  char *switcher_str = g_strdup(config.window_match_fields);
  const char *const sep = ",#";
  // Split token on ','. This modifies switcher_str.
  for (unsigned int i = 0; i < WIN_MATCH_NUM_FIELDS; i++) {
    matching_window_fields[i].enabled = FALSE;
  }
  for (char *token = strtok_r(switcher_str, sep, &savept); token != NULL;
       token = strtok_r(NULL, sep, &savept)) {
    if (strcmp(token, "all") == 0) {
      for (unsigned int i = 0; i < WIN_MATCH_NUM_FIELDS; i++) {
        matching_window_fields[i].enabled = TRUE;
      }
      break;
    }
    gboolean matched = FALSE;
    for (unsigned int i = 0; i < WIN_MATCH_NUM_FIELDS; i++) {
      const char *field_name = matching_window_fields[i].field_name;
      if (strcmp(token, field_name) == 0) {
        matching_window_fields[i].enabled = TRUE;
        matched = TRUE;
      }
    }
    if (!matched) {
      g_warning("Invalid window field name :%s", token);
    }
  }
  // Free string that was modified by strtok_r
  g_free(switcher_str);
}

static unsigned int window_mode_get_num_entries(const Mode *sw) {
  const WindowModePrivateData *pd =
      (const WindowModePrivateData *)mode_get_private_data(sw);

  return pd->ids ? pd->ids->len : 0;
}
/**
 * Small helper function to find the right entry in the ewmh reply.
 * Is there a call for this?
 */
const char *invalid_desktop_name = "n/a";
static const char *_window_name_list_entry(const char *str, uint32_t length,
                                           int entry) {
  uint32_t offset = 0;
  int index = 0;
  while (index < entry && offset < length) {
    if (str[offset] == 0) {
      index++;
    }
    offset++;
  }
  if (offset >= length) {
    return invalid_desktop_name;
  }
  return &str[offset];
}
static void _window_mode_load_data(Mode *sw, unsigned int cd) {
  WindowModePrivateData *pd =
      (WindowModePrivateData *)mode_get_private_data(sw);
  // find window list
  xcb_window_t curr_win_id;
  int found = 0;

  // Create cache

  x11_cache_create();
  xcb_get_property_cookie_t c =
      xcb_ewmh_get_active_window(&(xcb->ewmh), xcb->screen_nbr);
  if (!xcb_ewmh_get_active_window_reply(&xcb->ewmh, c, &curr_win_id, NULL)) {
    curr_win_id = 0;
  }

  // Get the current desktop.
  unsigned int current_desktop = 0;
  c = xcb_ewmh_get_current_desktop(&xcb->ewmh, xcb->screen_nbr);
  if (!xcb_ewmh_get_current_desktop_reply(&xcb->ewmh, c, &current_desktop,
                                          NULL)) {
    current_desktop = 0;
  }

  g_debug("Get list from: %d", xcb->screen_nbr);
  c = xcb_ewmh_get_client_list_stacking(&xcb->ewmh, xcb->screen_nbr);
  xcb_ewmh_get_windows_reply_t clients = {
      0,
  };
  if (xcb_ewmh_get_client_list_stacking_reply(&xcb->ewmh, c, &clients, NULL)) {
    found = 1;
  } else {
    c = xcb_ewmh_get_client_list(&xcb->ewmh, xcb->screen_nbr);
    if (xcb_ewmh_get_client_list_reply(&xcb->ewmh, c, &clients, NULL)) {
      found = 1;
    }
  }
  if (!found) {
    return;
  }

  if (clients.windows_len > 0) {
    int i;
    // windows we actually display. May be slightly different to
    // _NET_CLIENT_LIST_STACKING if we happen to have a window destroyed while
    // we're working...
    pd->ids = winlist_new();

    xcb_get_property_cookie_t prop_cookie =
        xcb_ewmh_get_desktop_names(&xcb->ewmh, xcb->screen_nbr);
    xcb_ewmh_get_utf8_strings_reply_t names;
    int has_names = FALSE;
    if (xcb_ewmh_get_desktop_names_reply(&xcb->ewmh, prop_cookie, &names,
                                         NULL)) {
      has_names = TRUE;
    }
    // calc widths of fields
    for (i = clients.windows_len - 1; i > -1; i--) {
      client *winclient = window_client(pd, clients.windows[i]);
      if ((winclient != NULL) && !winclient->xattr.override_redirect &&
          !client_has_window_type(winclient,
                                  xcb->ewmh._NET_WM_WINDOW_TYPE_DOCK) &&
          !client_has_window_type(winclient,
                                  xcb->ewmh._NET_WM_WINDOW_TYPE_DESKTOP) &&
          !client_has_state(winclient, xcb->ewmh._NET_WM_STATE_SKIP_PAGER) &&
          !client_has_state(winclient, xcb->ewmh._NET_WM_STATE_SKIP_TASKBAR)) {
        pd->clf_len =
            MAX(pd->clf_len, (winclient->class != NULL)
                                 ? (g_utf8_strlen(winclient->class, -1))
                                 : 0);

        if (client_has_state(winclient,
                             xcb->ewmh._NET_WM_STATE_DEMANDS_ATTENTION)) {
          winclient->demands = TRUE;
        }
        if ((winclient->hint_flags & XCB_ICCCM_WM_HINT_X_URGENCY) != 0) {
          winclient->demands = TRUE;
        }

        if (winclient->window == curr_win_id) {
          winclient->active = TRUE;
        }
        // find client's desktop.
        xcb_get_property_cookie_t cookie;
        xcb_get_property_reply_t *r;

        winclient->wmdesktop = 0xFFFFFFFF;
        cookie = xcb_get_property(xcb->connection, 0, winclient->window,
                                  xcb->ewmh._NET_WM_DESKTOP, XCB_ATOM_CARDINAL,
                                  0, 1);
        r = xcb_get_property_reply(xcb->connection, cookie, NULL);
        if (r) {
          if (r->type == XCB_ATOM_CARDINAL) {
            winclient->wmdesktop = *((uint32_t *)xcb_get_property_value(r));
          }
          free(r);
        }
        if (winclient->wmdesktop != 0xFFFFFFFF) {
          if (has_names) {
            if ((current_window_manager & WM_PANGO_WORKSPACE_NAMES) ==
                WM_PANGO_WORKSPACE_NAMES) {
              char *output = NULL;
              if (pango_parse_markup(
                      _window_name_list_entry(names.strings, names.strings_len,
                                              winclient->wmdesktop),
                      -1, 0, NULL, &output, NULL, NULL)) {
                winclient->wmdesktopstr = g_strdup(_window_name_list_entry(
                    names.strings, names.strings_len, winclient->wmdesktop));
                winclient->wmdesktopstr_len = g_utf8_strlen(output, -1);
                pd->wmdn_len = MAX(pd->wmdn_len, winclient->wmdesktopstr_len);
                g_free(output);
              } else {
                winclient->wmdesktopstr = g_strdup("Invalid name");
                winclient->wmdesktopstr_len =
                    g_utf8_strlen(winclient->wmdesktopstr, -1);
                pd->wmdn_len = MAX(pd->wmdn_len, winclient->wmdesktopstr_len);
              }
            } else {
              winclient->wmdesktopstr = g_markup_escape_text(
                  _window_name_list_entry(names.strings, names.strings_len,
                                          winclient->wmdesktop),
                  -1);
              winclient->wmdesktopstr_len =
                  g_utf8_strlen(winclient->wmdesktopstr, -1);
              pd->wmdn_len = MAX(pd->wmdn_len, winclient->wmdesktopstr_len);
            }
          } else {
            winclient->wmdesktopstr =
                g_strdup_printf("%u", (uint32_t)winclient->wmdesktop);
            winclient->wmdesktopstr_len =
                g_utf8_strlen(winclient->wmdesktopstr, -1);
            pd->wmdn_len = MAX(pd->wmdn_len, winclient->wmdesktopstr_len);
          }
        } else {
          winclient->wmdesktopstr = g_strdup("");
          winclient->wmdesktopstr_len =
              g_utf8_strlen(winclient->wmdesktopstr, -1);
          pd->wmdn_len = MAX(pd->wmdn_len, winclient->wmdesktopstr_len);
        }
        if (cd && winclient->wmdesktop != current_desktop) {
          continue;
        }
        winlist_append(pd->ids, winclient->window, NULL);
      }
    }

    if (has_names) {
      xcb_ewmh_get_utf8_strings_reply_wipe(&names);
    }
  }
  xcb_ewmh_get_windows_reply_wipe(&clients);
}
static int window_mode_init(Mode *sw) {
  if (mode_get_private_data(sw) == NULL) {
    WindowModePrivateData *pd = g_malloc0(sizeof(*pd));
    pd->window_regex = g_regex_new("{[-\\w]+(:-?[0-9]+)?}", 0, 0, NULL);
    mode_set_private_data(sw, (void *)pd);
    _window_mode_load_data(sw, FALSE);
    if (!window_matching_fields_parsed) {
      window_mode_parse_fields();
    }
  }
  return TRUE;
}
static int window_mode_init_cd(Mode *sw) {
  if (mode_get_private_data(sw) == NULL) {
    WindowModePrivateData *pd = g_malloc0(sizeof(*pd));
    pd->window_regex = g_regex_new("{[-\\w]+(:-?[0-9]+)?}", 0, 0, NULL);
    mode_set_private_data(sw, (void *)pd);
    _window_mode_load_data(sw, TRUE);
    if (!window_matching_fields_parsed) {
      window_mode_parse_fields();
    }
  }
  return TRUE;
}

static inline int act_on_window(xcb_window_t window) {
  int retv = TRUE;
  char **args = NULL;
  int argc = 0;
  char window_regex[100]; /* We are probably safe here */

  g_snprintf(window_regex, sizeof window_regex, "%d", window);

  helper_parse_setup(config.window_command, &args, &argc, "{window}",
                     window_regex, (char *)0);

  GError *error = NULL;
  g_spawn_async(NULL, args, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL,
                &error);
  if (error != NULL) {
    char *msg = g_strdup_printf(
        "Failed to execute action for window: '%s'\nError: '%s'", window_regex,
        error->message);
    rofi_view_error_dialog(msg, FALSE);
    g_free(msg);
    // print error.
    g_error_free(error);
    retv = FALSE;
  }

  // Free the args list.
  g_strfreev(args);
  return retv;
}

static ModeMode window_mode_result(Mode *sw, int mretv,
                                   G_GNUC_UNUSED char **input,
                                   unsigned int selected_line) {
  WindowModePrivateData *rmpd =
      (WindowModePrivateData *)mode_get_private_data(sw);
  ModeMode retv = MODE_EXIT;
  if ((mretv & (MENU_OK))) {
    if (mretv & MENU_CUSTOM_ACTION) {
      act_on_window(rmpd->ids->array[selected_line]);
    } else {
      // Disable reverting input focus to previous window.
      xcb->focus_revert = 0;
      rofi_view_hide();
      if ((current_window_manager & WM_DO_NOT_CHANGE_CURRENT_DESKTOP) == 0) {
        // Get the desktop of the client to switch to
        uint32_t wmdesktop = 0;
        xcb_get_property_cookie_t cookie;
        xcb_get_property_reply_t *r;
        // Get the current desktop.
        unsigned int current_desktop = 0;
        xcb_get_property_cookie_t c =
            xcb_ewmh_get_current_desktop(&xcb->ewmh, xcb->screen_nbr);
        if (!xcb_ewmh_get_current_desktop_reply(&xcb->ewmh, c, &current_desktop,
                                                NULL)) {
          current_desktop = 0;
        }

        cookie = xcb_get_property(
            xcb->connection, 0, rmpd->ids->array[selected_line],
            xcb->ewmh._NET_WM_DESKTOP, XCB_ATOM_CARDINAL, 0, 1);
        r = xcb_get_property_reply(xcb->connection, cookie, NULL);
        if (r && r->type == XCB_ATOM_CARDINAL) {
          wmdesktop = *((uint32_t *)xcb_get_property_value(r));
        }
        if (r && r->type != XCB_ATOM_CARDINAL) {
          // Assume the client is on all desktops.
          wmdesktop = current_desktop;
        }
        free(r);

        // If we have to switch the desktop, do
        if (wmdesktop != current_desktop) {
          xcb_ewmh_request_change_current_desktop(&xcb->ewmh, xcb->screen_nbr,
                                                  wmdesktop, XCB_CURRENT_TIME);
        }
      }
      // Activate the window
      xcb_ewmh_request_change_active_window(
          &xcb->ewmh, xcb->screen_nbr, rmpd->ids->array[selected_line],
          XCB_EWMH_CLIENT_SOURCE_TYPE_OTHER, XCB_CURRENT_TIME,
          rofi_view_get_window());
      xcb_flush(xcb->connection);
    }
  } else if ((mretv & (MENU_ENTRY_DELETE)) == MENU_ENTRY_DELETE) {
    xcb_ewmh_request_close_window(
        &(xcb->ewmh), xcb->screen_nbr, rmpd->ids->array[selected_line],
        XCB_CURRENT_TIME, XCB_EWMH_CLIENT_SOURCE_TYPE_OTHER);
    xcb_flush(xcb->connection);
    ThemeWidget *wid = rofi_config_find_widget(sw->name, NULL, TRUE);
    Property *p =
        rofi_theme_find_property(wid, P_BOOLEAN, "close-on-delete", TRUE);
    if (p && p->type == P_BOOLEAN && p->value.b == FALSE) {

      return RELOAD_DIALOG;
    }
  } else if ((mretv & MENU_CUSTOM_INPUT) && *input != NULL &&
             *input[0] != '\0') {
    GError *error = NULL;
    gboolean run_in_term = ((mretv & MENU_CUSTOM_ACTION) == MENU_CUSTOM_ACTION);
    gsize lf_cmd_size = 0;
    gchar *lf_cmd = g_locale_from_utf8(*input, -1, NULL, &lf_cmd_size, &error);
    if (error != NULL) {
      g_warning("Failed to convert command to locale encoding: %s",
                error->message);
      g_error_free(error);
      return RELOAD_DIALOG;
    }

    RofiHelperExecuteContext context = {.name = NULL};
    if (!helper_execute_command(NULL, lf_cmd, run_in_term,
                                run_in_term ? &context : NULL)) {
      retv = RELOAD_DIALOG;
    }
    g_free(lf_cmd);
  } else if (mretv & MENU_CUSTOM_COMMAND) {
    retv = (mretv & MENU_LOWER_MASK);
  }
  return retv;
}

static void window_mode_destroy(Mode *sw) {
  WindowModePrivateData *rmpd =
      (WindowModePrivateData *)mode_get_private_data(sw);
  if (rmpd != NULL) {
    winlist_free(rmpd->ids);
    x11_cache_free();
    g_free(rmpd->cache);
    g_regex_unref(rmpd->window_regex);
    g_free(rmpd);
    mode_set_private_data(sw, NULL);
  }
}
struct arg {
  const WindowModePrivateData *pd;
  client *c;
};

static void helper_eval_add_str(GString *str, const char *input, int l,
                                int max_len, int nc) {
  // g_utf8 does not work with NULL string.
  const char *input_nn = input ? input : "";
  // Both l and max_len are in characters, not bytes.
  int spaces = 0;
  if (l == 0) {
    spaces = MAX(0, max_len - nc);
    g_string_append(str, input_nn);
  } else {
    if (nc > l) {
      int bl = g_utf8_offset_to_pointer(input_nn, l) - input_nn;
      char *tmp = g_markup_escape_text(input_nn, bl);
      g_string_append(str, tmp);
      g_free(tmp);
    } else {
      spaces = l - nc;
      char *tmp = g_markup_escape_text(input_nn, -1);
      g_string_append(str, tmp);
      g_free(tmp);
    }
  }
  while (spaces--) {
    g_string_append_c(str, ' ');
  }
}
static gboolean helper_eval_cb(const GMatchInfo *info, GString *str,
                               gpointer data) {
  struct arg *d = (struct arg *)data;
  gchar *match;
  // Get the match
  match = g_match_info_fetch(info, 0);
  if (match != NULL) {
    int l = 0;
    if (match[2] == ':') {
      l = (int)g_ascii_strtoll(&match[3], NULL, 10);
      if (l < 0) {
        l = 0;
      }
    }
    if (match[1] == 'w') {
      helper_eval_add_str(str, d->c->wmdesktopstr, l, d->pd->wmdn_len,
                          d->c->wmdesktopstr_len);
    } else if (match[1] == 'c') {
      helper_eval_add_str(str, d->c->class, l, d->pd->clf_len,
                          g_utf8_strlen(d->c->class, -1));
    } else if (match[1] == 't') {
      helper_eval_add_str(str, d->c->title, l, d->pd->title_len,
                          g_utf8_strlen(d->c->title, -1));
    } else if (match[1] == 'n') {
      helper_eval_add_str(str, d->c->name, l, d->pd->name_len,
                          g_utf8_strlen(d->c->name, -1));
    } else if (match[1] == 'r') {
      helper_eval_add_str(str, d->c->role, l, d->pd->role_len,
                          g_utf8_strlen(d->c->role, -1));
    }

    g_free(match);
  }
  return FALSE;
}
static char *_generate_display_string(const WindowModePrivateData *pd,
                                      client *c) {
  struct arg d = {pd, c};
  char *res = g_regex_replace_eval(pd->window_regex, config.window_format, -1,
                                   0, 0, helper_eval_cb, &d, NULL);
  return g_strchomp(res);
}

static char *_get_display_value(const Mode *sw, unsigned int selected_line,
                                int *state, G_GNUC_UNUSED GList **list,
                                int get_entry) {
  WindowModePrivateData *rmpd = mode_get_private_data(sw);
  client *c = window_client(rmpd, rmpd->ids->array[selected_line]);
  if (c == NULL) {
    return get_entry ? g_strdup("Window has vanished") : NULL;
  }
  if (c->demands) {
    *state |= URGENT;
  }
  if (c->active) {
    *state |= ACTIVE;
  }
  *state |= MARKUP;
  return get_entry ? _generate_display_string(rmpd, c) : NULL;
}

/**
 * Icon code borrowed from https://github.com/olejorgenb/extract-window-icon
 */
static cairo_user_data_key_t data_key;

/** Create a surface object from this image data.
 * \param width The width of the image.
 * \param height The height of the image
 * \param data The image's data in ARGB format, will be copied by this function.
 */
static cairo_surface_t *draw_surface_from_data(int width, int height,
                                               uint32_t const *const data) {
  unsigned long int len = width * height;
  unsigned long int i;
  uint32_t *buffer = g_new0(uint32_t, len);
  cairo_surface_t *surface;

  /* Cairo wants premultiplied alpha, meh :( */
  for (i = 0; i < len; i++) {
    uint8_t a = (data[i] >> 24) & 0xff;
    double alpha = a / 255.0;
    uint8_t r = ((data[i] >> 16) & 0xff) * alpha;
    uint8_t g = ((data[i] >> 8) & 0xff) * alpha;
    uint8_t b = ((data[i] >> 0) & 0xff) * alpha;
    buffer[i] = (a << 24) | (r << 16) | (g << 8) | b;
  }

  surface = cairo_image_surface_create_for_data(
      (unsigned char *)buffer, CAIRO_FORMAT_ARGB32, width, height, width * 4);
  /* This makes sure that buffer will be freed */
  cairo_surface_set_user_data(surface, &data_key, buffer, g_free);

  return surface;
}
static cairo_surface_t *ewmh_window_icon_from_reply(xcb_get_property_reply_t *r,
                                                    uint32_t preferred_size) {
  uint32_t *data, *end, *found_data = 0;
  uint32_t found_size = 0;

  if (!r || r->type != XCB_ATOM_CARDINAL || r->format != 32 || r->length < 2) {
    return 0;
  }

  data = (uint32_t *)xcb_get_property_value(r);
  if (!data) {
    return 0;
  }

  end = data + r->length;

  /* Goes over the icon data and picks the icon that best matches the size
   * preference. In case the size match is not exact, picks the closest bigger
   * size if present, closest smaller size otherwise.
   */
  while (data + 1 < end) {
    /* check whether the data size specified by width and height fits into the
     * array we got */
    uint64_t data_size = (uint64_t)data[0] * data[1];
    if (data_size > (uint64_t)(end - data - 2)) {
      break;
    }

    /* use the greater of the two dimensions to match against the preferred size
     */
    uint32_t size = MAX(data[0], data[1]);

    /* pick the icon if it's a better match than the one we already have */
    gboolean found_icon_too_small = found_size < preferred_size;
    gboolean found_icon_too_large = found_size > preferred_size;
    gboolean icon_empty = data[0] == 0 || data[1] == 0;
    gboolean better_because_bigger = found_icon_too_small && size > found_size;
    gboolean better_because_smaller =
        found_icon_too_large && size >= preferred_size && size < found_size;
    if (!icon_empty &&
        (better_because_bigger || better_because_smaller || found_size == 0)) {
      found_data = data;
      found_size = size;
    }

    data += data_size + 2;
  }

  if (!found_data) {
    return 0;
  }

  return draw_surface_from_data(found_data[0], found_data[1], found_data + 2);
}
/** Get NET_WM_ICON. */
static cairo_surface_t *get_net_wm_icon(xcb_window_t xid,
                                        uint32_t preferred_size) {
  xcb_get_property_cookie_t cookie = xcb_get_property_unchecked(
      xcb->connection, FALSE, xid, xcb->ewmh._NET_WM_ICON, XCB_ATOM_CARDINAL, 0,
      UINT32_MAX);
  xcb_get_property_reply_t *r =
      xcb_get_property_reply(xcb->connection, cookie, NULL);
  cairo_surface_t *surface = ewmh_window_icon_from_reply(r, preferred_size);
  free(r);
  return surface;
}
static cairo_surface_t *_get_icon(const Mode *sw, unsigned int selected_line,
                                  int size) {
  WindowModePrivateData *rmpd = mode_get_private_data(sw);
  client *c = window_client(rmpd, rmpd->ids->array[selected_line]);
  if (c == NULL) {
    return NULL;
  }
  if (c->icon_fetch_size != size) {
    if (c->icon) {
      cairo_surface_destroy(c->icon);
      c->icon = NULL;
    }
    c->thumbnail_checked = FALSE;
    c->icon_checked = FALSE;
  }
  if (config.window_thumbnail && c->thumbnail_checked == FALSE) {
    c->icon = x11_helper_get_screenshot_surface_window(c->window, size);
    c->thumbnail_checked = TRUE;
  }
  if (c->icon == NULL && c->icon_checked == FALSE) {
    c->icon = get_net_wm_icon(rmpd->ids->array[selected_line], size);
    c->icon_checked = TRUE;
  }
  if (c->icon == NULL && c->class) {
    if (c->icon_fetch_uid > 0) {
      return rofi_icon_fetcher_get(c->icon_fetch_uid);
    }
    char *class_lower = g_utf8_strdown(c->class, -1);
    c->icon_fetch_uid = rofi_icon_fetcher_query(class_lower, size);
    g_free(class_lower);
    c->icon_fetch_size = size;
    return rofi_icon_fetcher_get(c->icon_fetch_uid);
  }
  c->icon_fetch_size = size;
  return c->icon;
}

#include "mode-private.h"
Mode window_mode = {.name = "window",
                    .cfg_name_key = "display-window",
                    ._init = window_mode_init,
                    ._get_num_entries = window_mode_get_num_entries,
                    ._result = window_mode_result,
                    ._destroy = window_mode_destroy,
                    ._token_match = window_match,
                    ._get_display_value = _get_display_value,
                    ._get_icon = _get_icon,
                    ._get_completion = NULL,
                    ._preprocess_input = NULL,
                    .private_data = NULL,
                    .free = NULL};
Mode window_mode_cd = {.name = "windowcd",
                       .cfg_name_key = "display-windowcd",
                       ._init = window_mode_init_cd,
                       ._get_num_entries = window_mode_get_num_entries,
                       ._result = window_mode_result,
                       ._destroy = window_mode_destroy,
                       ._token_match = window_match,
                       ._get_display_value = _get_display_value,
                       ._get_icon = _get_icon,
                       ._get_completion = NULL,
                       ._preprocess_input = NULL,
                       .private_data = NULL,
                       .free = NULL};

#endif // WINDOW_MODE