MIT License

Copyright (c) 2017 Serge Zaitsev
Copyright (c) 2018 Thomas Chust

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.

#!/bin/sh -e
if test "$(uname -s)" = "Darwin"; then
    "$CHICKEN_CSC" -O2 -d1 -C "$CFLAGS -DWEBVIEW_COCOA -xobjective-c" -L "$LDFLAGS -framework Cocoa" webview.impl.c "$@"
elif pkg-config --exists webkit2gtk-4.0; then
    "$CHICKEN_CSC" -O2 -d1 -C "$CFLAGS -DWEBVIEW_GTK=2 $(pkg-config --cflags glib-2.0 gtk+-3.0 webkit2gtk-4.0)" -L "$LDFLAGS $(pkg-config --libs glib-2.0 gtk+-3.0 webkit2gtk-4.0)" webview.impl.c "$@"
elif pkg-config --exists webkitgtk-3.0; then
    "$CHICKEN_CSC" -O2 -d1 -C "$CFLAGS -DWEBVIEW_GTK=1 $(pkg-config --cflags glib-2.0 gtk+-3.0 webkitgtk-3.0)" -L "$LDFLAGS $(pkg-config --libs glib-2.0 gtk+-3.0 webkitgtk-3.0)" webview.impl.c "$@"
fi

@echo off
%CHICKEN_CSC% -O2 -d1 -C %CFLAGS% -C -DWEBVIEW_WINAPI -L -ladvapi32 -L %LDFLAGS% -L -luser32 -L -lgdi32 -L -lole32 -L -loleaut32 -L -luuid webview.impl.c %*

((category ui)
 (synopsis "Multi-platform HTML user interface shell")
 (author "Thomas Chust")
 (license "BSD")
 (version "1.0.0")
 (dependencies
   srfi-1
   srfi-13
   srfi-18
   srfi-69
   utf8)
 (components
   (extension webview
     (custom-build "build-webview")
     (source-dependencies "webview.h" "webview.impl.c"))))

;; vim: set ai et ts=4 sts=2 sw=2 ft=scheme: ;;

/*
 * MIT License
 *
 * Copyright (c) 2017 Serge Zaitsev
 * Copyright (c) 2018 Thomas Chust
 *
 * 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.
 */
#ifndef WEBVIEW_H
#define WEBVIEW_H

#if defined(_WIN32)
#if defined(WEBVIEW_GTK) || defined(WEBVIEW_WINAPI)
#define WEBVIEW_API __declspec(dllexport)
#else
#define WEBVIEW_API __declspec(dllimport)
#endif
#else
#define WEBVIEW_API extern
#endif

#include <stddef.h>

typedef struct webview webview_t;

typedef void (*webview_invoke_fn)(webview_t *w, const char *arg);

typedef enum webview_dialog {
  WEBVIEW_DIALOG_TYPE_OPEN = 0,
  WEBVIEW_DIALOG_TYPE_SAVE = 1,
  WEBVIEW_DIALOG_TYPE_ALERT = 2
} webview_dialog_t;

#define WEBVIEW_DIALOG_FLAG_FILE (0 << 0)
#define WEBVIEW_DIALOG_FLAG_DIRECTORY (1 << 0)

#define WEBVIEW_DIALOG_FLAG_INFO (1 << 1)
#define WEBVIEW_DIALOG_FLAG_WARNING (2 << 1)
#define WEBVIEW_DIALOG_FLAG_ERROR (3 << 1)
#define WEBVIEW_DIALOG_FLAG_ALERT_MASK (3 << 1)

typedef void (*webview_dispatch_fn)(webview_t *w, void *arg);

WEBVIEW_API webview_t *webview_new(const char *title, const char *url, int width, int height, int resizable, int debug);
WEBVIEW_API void webview_destroy(webview_t *w);

WEBVIEW_API int webview_loop(webview_t *w, int blocking);
WEBVIEW_API void webview_dispatch(webview_t *w, webview_dispatch_fn fn, void *arg);
WEBVIEW_API void webview_terminate(webview_t *w);

WEBVIEW_API void webview_set_title(webview_t *w, const char *title);
WEBVIEW_API void webview_set_external_invoke_cb(webview_t *w, webview_invoke_fn external_invoke_cb);
WEBVIEW_API void webview_set_fullscreen(webview_t *w, int fullscreen);

WEBVIEW_API int webview_eval(webview_t *w, const char *js);
WEBVIEW_API void webview_dialog(webview_t *w,
                                webview_dialog_t dlgtype, int flags,
                                const char *title, const char *arg,
                                char *result, size_t resultsz);

WEBVIEW_API void webview_print_log(const char *s);

#endif /* WEBVIEW_H */

/*
 * MIT License
 *
 * Copyright (c) 2017 Serge Zaitsev
 * Copyright (c) 2018 Thomas Chust
 *
 * 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.
 */
#include "webview.h"

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

struct webview_conf {
  const char *title;
  const char *url;
  int width;
  int height;
  int resizable;
  int debug;
};

#if defined(WEBVIEW_GTK)
#include <glib.h>
#include <JavaScriptCore/JavaScript.h>
#include <gtk/gtk.h>
#if WEBVIEW_GTK >= 2
/* Link with `pkg-config --libs glib-2.0 gtk+-3.0 webkit2gtk-4.0` */
#include <webkit2/webkit2.h>
#else
/* Link with `pkg-config --libs glib-2.0 gtk+-3.0 webkitgtk-3.0` */
#include <webkit/webkit.h>
#endif

struct webview_priv {
  int ready;
  GtkWidget *window;
  GtkWidget *webview;
  GtkWidget *inspector_window;
  GtkWidget *inspector_webview;
  int should_exit;
};
#elif defined(WEBVIEW_WINAPI)
/* Link with -luser32 -lgdi32 -lole32 -loleaut32 -luuid */
#define CINTERFACE
#include <windows.h>

#include <commctrl.h>
#include <exdisp.h>
#include <mshtmhst.h>
#include <mshtml.h>
#include <shobjidl.h>

#include <stdio.h>

struct webview_priv {
  HWND hwnd;
  IOleObject **browser;
  BOOL is_fullscreen;
  DWORD saved_style;
  DWORD saved_ex_style;
  RECT saved_rect;
};
#elif defined(WEBVIEW_COCOA)
#import <Cocoa/Cocoa.h>
#import <WebKit/WebKit.h>
#import <objc/runtime.h>

struct webview_priv {
  NSAutoreleasePool *pool;
  NSWindow *window;
  WebView *webview;
  id windowDelegate;
  int should_exit;
};
#else
#error "Define one of: WEBVIEW_GTK, WEBVIEW_COCOA or WEBVIEW_WINAPI"
#endif

struct webview {
  webview_invoke_fn external_invoke_cb;
  struct webview_priv priv;
};

struct webview_dispatch_arg {
  webview_dispatch_fn fn;
  webview_t *w;
  void *arg;
};

#define DEFAULT_URL                                                     \
  "data:text/html,%3C%21DOCTYPE%20html%3E%0A%3Chtml%20lang=%22en%22%3E" \
  "%0A%3Chead%3E%3Cmeta%20charset=%22utf-8%22%3E%3Cmeta%20http-equiv=%" \
  "22X-UA-Compatible%22%20content=%22IE=edge%22%3E%3C%2Fhead%3E%0A%3Cb" \
  "ody%3E%3Cdiv%20id=%22app%22%3E%3C%2Fdiv%3E%3Cscript%20type=%22text%" \
  "2Fjavascript%22%3Ewindow.external.invoke%28%22load%22%29%3C%2Fscrip" \
  "t%3E%3C%2Fbody%3E%0A%3C%2Fhtml%3E"

static int webview_init(webview_t *w, const struct webview_conf *c);
static void webview_exit(webview_t *w);

webview_t *webview_new(const char *title, const char *url, int width, int height, int resizable, int debug) {
  struct webview_conf c = {0};
  c.title = title;
  c.url = url;
  c.width = width;
  c.height = height;
  c.resizable = resizable;
  c.debug = debug;

  webview_t *w = (webview_t *)malloc(sizeof(struct webview));
  if (w != NULL) {
    memset(w, 0, sizeof(struct webview));
    w->external_invoke_cb = NULL;
    if (webview_init(w, &c) != 0) {
      free(w);
      w = NULL;
    }
  }

  return w;
}

void webview_destroy(webview_t *w) {
  if (w != NULL) {
    webview_exit(w);
    free(w);
  }
}

void webview_set_external_invoke_cb(webview_t *w, webview_invoke_fn external_invoke_cb) {
  w->external_invoke_cb = external_invoke_cb;
}

static const char *webview_check_url(const char *url) {
  if (url == NULL || *url == 0) {
    return DEFAULT_URL;
  }
  return url;
}

#if defined(WEBVIEW_GTK)
#if WEBVIEW_GTK >= 2
static void external_message_received_cb(WebKitUserContentManager *m,
                                         WebKitJavascriptResult *r,
                                         gpointer arg) {
  (void)m;
  webview_t *w = (webview_t *)arg;
  if (w->external_invoke_cb == NULL) {
    return;
  }
  JSGlobalContextRef context = webkit_javascript_result_get_global_context(r);
  JSValueRef value = webkit_javascript_result_get_value(r);
  JSStringRef js = JSValueToStringCopy(context, value, NULL);
  size_t n = JSStringGetMaximumUTF8CStringSize(js);
  char *s = g_new(char, n);
  JSStringGetUTF8CString(js, s, n);
  w->external_invoke_cb(w, s);
  JSStringRelease(js);
  g_free(s);
}

static void webview_load_changed_cb(WebKitWebView *webview,
                                    WebKitLoadEvent event, gpointer arg) {
  (void)webview;
  webview_t *w = (webview_t *)arg;
  if (event == WEBKIT_LOAD_FINISHED) {
    w->priv.ready = 1;
  }
}
#else
static void external_message_dispatch_cb(webview_t *w, gpointer arg) {
  char *s = (char *)arg;
  if (w->external_invoke_cb != NULL) {
    w->external_invoke_cb(w, s);
  }
  g_free(s);
}

static JSValueRef external_message_received_cb(JSContextRef context,
                                               JSObjectRef function,
                                               JSObjectRef thisObject,
                                               size_t nargs, const JSValueRef args[],
                                               JSValueRef *exception) {
  webview_t *w = (webview_t *)JSObjectGetPrivate(thisObject);
  if (w->external_invoke_cb == NULL || nargs == 0) {
    return JSValueMakeUndefined(context);
  }
  JSStringRef js = JSValueToStringCopy(context, args[0], NULL);
  size_t n = JSStringGetMaximumUTF8CStringSize(js);
  char *s = g_new(char, n);
  JSStringGetUTF8CString(js, s, n);
  JSStringRelease(js);
  webview_dispatch(w, external_message_dispatch_cb, s);
  return JSValueMakeUndefined(context);
}

static const JSStaticFunction external_methods[] = {
  {
    .name = "invoke",
    .callAsFunction = external_message_received_cb,
    .attributes = kJSPropertyAttributeNone
  },
  {0}
};

static const JSClassDefinition external_class = {
  .version = 0,
  .attributes = kJSClassAttributeNone,
  .className = "external",
  .staticFunctions = external_methods
};

static void webview_window_object_cleared(WebKitWebView *webview,
                                          WebKitWebFrame *frame,
                                          gpointer _context,
                                          gpointer _window,
                                          gpointer arg) {
  JSContextRef context = (JSContextRef)_context;
  JSObjectRef window = (JSObjectRef)_window;
  JSStringRef name = JSStringCreateWithUTF8CString("external");
  JSClassRef external = JSClassCreate(&external_class);
  JSObjectSetProperty(context, window, name, JSObjectMake(context, external, arg), kJSPropertyAttributeNone, NULL);
  JSStringRelease(name);
  JSClassRelease(external);
}

static void webview_load_changed_cb(WebKitWebView *webview,
                                    GParamSpec *spec, gpointer arg) {
  WebKitLoadStatus event = webkit_web_view_get_load_status(webview);
  webview_t *w = (webview_t *)arg;
  if (event == WEBKIT_LOAD_FINISHED) {
    w->priv.ready = 1;
  }
}

static void webview_destroy_inspector_cb(GtkWidget *widget, gpointer arg) {
  (void)widget;
  webview_t *w = (webview_t *)arg;
  w->priv.inspector_window = NULL;
  w->priv.inspector_webview = NULL;
}

static WebKitWebView *webview_inspect_cb(WebKitWebInspector *inspector,
                                         WebKitWebView *webview,
                                         gpointer arg) {
  webview_t *w = (webview_t *)arg;
  if (w->priv.inspector_webview == NULL) {
    w->priv.inspector_window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_title(GTK_WINDOW(w->priv.inspector_window), "Web Inspector");
    gtk_window_set_default_size(GTK_WINDOW(w->priv.inspector_window), 800, 600);
    gtk_window_set_resizable(GTK_WINDOW(w->priv.inspector_window), TRUE);
    gtk_window_set_position(GTK_WINDOW(w->priv.inspector_window), GTK_WIN_POS_CENTER);

    GtkWidget *scroller = gtk_scrolled_window_new(NULL, NULL);
    gtk_container_add(GTK_CONTAINER(w->priv.inspector_window), scroller);

    w->priv.inspector_webview = webkit_web_view_new();
    gtk_container_add(GTK_CONTAINER(scroller), w->priv.inspector_webview);

    g_signal_connect(G_OBJECT(w->priv.inspector_window), "destroy",
                     G_CALLBACK(webview_destroy_inspector_cb), w);
  }
  return WEBKIT_WEB_VIEW(w->priv.inspector_webview);
}

static gboolean webview_show_inspector_window(WebKitWebInspector *inspector,
                                              gpointer arg) {
  webview_t *w = (webview_t *)arg;
  if (w->priv.inspector_window != NULL) {
    gtk_widget_show_all(w->priv.inspector_window);
    return TRUE;
  }
  else {
    return FALSE;
  }
}

static gboolean webview_close_inspector_window(WebKitWebInspector *inspector,
                                               gpointer arg) {
  webview_t *w = (webview_t *)arg;
  if (w->priv.inspector_window != NULL) {
    gtk_widget_hide(w->priv.inspector_window);
    return TRUE;
  }
  else {
    return FALSE;
  }
}
#endif

static void webview_destroy_cb(GtkWidget *widget, gpointer arg) {
  (void)widget;
  webview_t *w = (webview_t *)arg;
  webview_terminate(w);
  if (w->priv.inspector_window != NULL) {
    gtk_widget_destroy(w->priv.inspector_window);
  }
}

static gboolean webview_context_menu_cb(WebKitWebView *webview,
                                        GtkWidget *default_menu,
                                        WebKitHitTestResult *hit_test_result,
                                        gboolean triggered_with_keyboard,
                                        gpointer userdata) {
  (void)webview;
  (void)default_menu;
  (void)hit_test_result;
  (void)triggered_with_keyboard;
  (void)userdata;
  return TRUE;
}

int webview_init(webview_t *w, const struct webview_conf *c) {
  if (gtk_init_check(0, NULL) == FALSE) {
    return -1;
  }

  w->priv.ready = 0;
  w->priv.should_exit = 0;
  w->priv.window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title(GTK_WINDOW(w->priv.window), c->title);

  if (c->resizable) {
    gtk_window_set_default_size(GTK_WINDOW(w->priv.window), c->width, c->height);
  } else {
    gtk_widget_set_size_request(w->priv.window, c->width, c->height);
  }
  gtk_window_set_resizable(GTK_WINDOW(w->priv.window), !!c->resizable);
  gtk_window_set_position(GTK_WINDOW(w->priv.window), GTK_WIN_POS_CENTER);

  GtkWidget *scroller = gtk_scrolled_window_new(NULL, NULL);
  gtk_container_add(GTK_CONTAINER(w->priv.window), scroller);

#if WEBVIEW_GTK >= 2
  WebKitUserContentManager *m = webkit_user_content_manager_new();
  webkit_user_content_manager_register_script_message_handler(m, "external");
  g_signal_connect(G_OBJECT(m), "script-message-received::external",
                   G_CALLBACK(external_message_received_cb), w);

  w->priv.webview = webkit_web_view_new_with_user_content_manager(m);
  g_signal_connect(G_OBJECT(w->priv.webview), "load-changed",
                   G_CALLBACK(webview_load_changed_cb), w);
#else
  w->priv.webview = webkit_web_view_new();
  g_signal_connect(G_OBJECT(w->priv.webview), "window-object-cleared",
                   G_CALLBACK(webview_window_object_cleared), w);
  g_signal_connect(G_OBJECT(w->priv.webview), "notify::load-status",
                   G_CALLBACK(webview_load_changed_cb), w);
#endif
  webkit_web_view_load_uri(WEBKIT_WEB_VIEW(w->priv.webview),
                           webview_check_url(c->url));
  gtk_container_add(GTK_CONTAINER(scroller), w->priv.webview);

  if (c->debug) {
#if WEBVIEW_GTK >= 2
    WebKitSettings *settings =
        webkit_web_view_get_settings(WEBKIT_WEB_VIEW(w->priv.webview));
    webkit_settings_set_enable_write_console_messages_to_stdout(settings, TRUE);
    webkit_settings_set_enable_developer_extras(settings, TRUE);
#else
    WebKitWebSettings *settings =
        webkit_web_view_get_settings(WEBKIT_WEB_VIEW(w->priv.webview));
    g_object_set(G_OBJECT(settings),
                 "enable-developer-extras", TRUE,
                 NULL);
    WebKitWebInspector *inspector =
        webkit_web_view_get_inspector(WEBKIT_WEB_VIEW(w->priv.webview));
    g_signal_connect(G_OBJECT(inspector), "inspect-web-view",
                     G_CALLBACK(webview_inspect_cb), w);
    g_signal_connect(G_OBJECT(inspector), "show-window",
                     G_CALLBACK(webview_show_inspector_window), w);
    g_signal_connect(G_OBJECT(inspector), "close-window",
                     G_CALLBACK(webview_close_inspector_window), w);
#endif
  } else {
    g_signal_connect(G_OBJECT(w->priv.webview), "context-menu",
                     G_CALLBACK(webview_context_menu_cb), w);
  }

  gtk_widget_show_all(w->priv.window);

#if WEBVIEW_GTK >= 2
  webkit_web_view_run_javascript(
      WEBKIT_WEB_VIEW(w->priv.webview),
      "window.external={invoke:function(x){"
      "window.webkit.messageHandlers.external.postMessage(x)}}",
      NULL, NULL, NULL);
#endif

  g_signal_connect(G_OBJECT(w->priv.window), "destroy",
                   G_CALLBACK(webview_destroy_cb), w);
  return 0;
}

int webview_loop(webview_t *w, int blocking) {
  gtk_main_iteration_do(blocking);
  return w->priv.should_exit;
}

void webview_set_title(webview_t *w, const char *title) {
  gtk_window_set_title(GTK_WINDOW(w->priv.window), title);
}

void webview_set_fullscreen(webview_t *w, int fullscreen) {
  if (fullscreen) {
    gtk_window_fullscreen(GTK_WINDOW(w->priv.window));
  } else {
    gtk_window_unfullscreen(GTK_WINDOW(w->priv.window));
  }
}

void webview_dialog(webview_t *w,
                                webview_dialog_t dlgtype, int flags,
                                const char *title, const char *arg,
                                char *result, size_t resultsz) {
  GtkWidget *dlg;
  if (result != NULL) {
    result[0] = '\0';
  }
  if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
      dlgtype == WEBVIEW_DIALOG_TYPE_SAVE) {
    dlg = gtk_file_chooser_dialog_new(
        title, GTK_WINDOW(w->priv.window),
        (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN
             ? (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY
                    ? GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER
                    : GTK_FILE_CHOOSER_ACTION_OPEN)
             : GTK_FILE_CHOOSER_ACTION_SAVE),
        "_Cancel", GTK_RESPONSE_CANCEL,
        (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ? "_Open" : "_Save"),
        GTK_RESPONSE_ACCEPT, NULL);
    gtk_file_chooser_set_local_only(GTK_FILE_CHOOSER(dlg), FALSE);
    gtk_file_chooser_set_select_multiple(GTK_FILE_CHOOSER(dlg), FALSE);
    gtk_file_chooser_set_show_hidden(GTK_FILE_CHOOSER(dlg), TRUE);
    gtk_file_chooser_set_do_overwrite_confirmation(GTK_FILE_CHOOSER(dlg), TRUE);
    gtk_file_chooser_set_create_folders(GTK_FILE_CHOOSER(dlg), TRUE);
    gint response = gtk_dialog_run(GTK_DIALOG(dlg));
    if (response == GTK_RESPONSE_ACCEPT) {
      gchar *filename = gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dlg));
      g_strlcpy(result, filename, resultsz);
      g_free(filename);
    }
    gtk_widget_destroy(dlg);
  } else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT) {
    GtkMessageType type = GTK_MESSAGE_OTHER;
    switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK) {
    case WEBVIEW_DIALOG_FLAG_INFO:
      type = GTK_MESSAGE_INFO;
      break;
    case WEBVIEW_DIALOG_FLAG_WARNING:
      type = GTK_MESSAGE_WARNING;
      break;
    case WEBVIEW_DIALOG_FLAG_ERROR:
      type = GTK_MESSAGE_ERROR;
      break;
    }
    dlg = gtk_message_dialog_new(GTK_WINDOW(w->priv.window), GTK_DIALOG_MODAL,
                                 type, GTK_BUTTONS_OK, "%s", title);
    gtk_message_dialog_format_secondary_text(GTK_MESSAGE_DIALOG(dlg), "%s",
                                             arg);
    gtk_dialog_run(GTK_DIALOG(dlg));
    gtk_widget_destroy(dlg);
  }
}

int webview_eval(webview_t *w, const char *js) {
  while (w->priv.ready == 0) {
    g_main_context_iteration(0, FALSE);
  }
#if WEBVIEW_GTK >= 2
  webkit_web_view_run_javascript(WEBKIT_WEB_VIEW(w->priv.webview), js, NULL,
                                 NULL, NULL);
#else
  webkit_web_view_execute_script(WEBKIT_WEB_VIEW(w->priv.webview), js);
#endif
  return 0;
}

static gboolean webview_dispatch_wrapper(gpointer userdata) {
  struct webview_dispatch_arg *arg = (struct webview_dispatch_arg *)userdata;
  (arg->fn)(arg->w, arg->arg);
  g_free(arg);
  return FALSE;
}

void webview_dispatch(webview_t *w, webview_dispatch_fn fn,
                                  void *arg) {
  struct webview_dispatch_arg *context = g_new(struct webview_dispatch_arg, 1);
  context->w = w;
  context->arg = arg;
  context->fn = fn;
  gdk_threads_add_idle(webview_dispatch_wrapper, context);
}

void webview_terminate(webview_t *w) {
  w->priv.should_exit = 1;
}

void webview_exit(webview_t *w) { (void)w; }
void webview_print_log(const char *s) { g_message("%s", s); }

#endif /* WEBVIEW_GTK */

#if defined(WEBVIEW_WINAPI)

#define WM_WEBVIEW_DISPATCH (WM_APP + 1)

typedef struct {
  IOleInPlaceFrame frame;
  HWND window;
} _IOleInPlaceFrameEx;

typedef struct {
  IOleInPlaceSite inplace;
  _IOleInPlaceFrameEx frame;
} _IOleInPlaceSiteEx;

typedef struct { IDocHostUIHandler ui; } _IDocHostUIHandlerEx;

typedef struct {
  IOleClientSite client;
  _IOleInPlaceSiteEx inplace;
  _IDocHostUIHandlerEx ui;
  IDispatch external;
} _IOleClientSiteEx;

#ifdef __cplusplus
#define iid_ref(x) &(x)
#define iid_unref(x) *(x)
#else
#define iid_ref(x) (x)
#define iid_unref(x) (x)
#endif

static inline WCHAR *webview_to_utf16(const char *s) {
  DWORD size = MultiByteToWideChar(CP_UTF8, 0, s, -1, 0, 0);
  WCHAR *ws = (WCHAR *)GlobalAlloc(GMEM_FIXED, sizeof(WCHAR) * size);
  if (ws == NULL) {
    return NULL;
  }
  MultiByteToWideChar(CP_UTF8, 0, s, -1, ws, size);
  return ws;
}

static inline char *webview_from_utf16(WCHAR *ws) {
  int n = WideCharToMultiByte(CP_UTF8, 0, ws, -1, NULL, 0, NULL, NULL);
  char *s = (char *)GlobalAlloc(GMEM_FIXED, n);
  if (s == NULL) {
    return NULL;
  }
  WideCharToMultiByte(CP_UTF8, 0, ws, -1, s, n, NULL, NULL);
  return s;
}

static int iid_eq(REFIID a, const IID *b) {
  return memcmp((const void *)iid_ref(a), (const void *)b, sizeof(GUID)) == 0;
}

static HRESULT STDMETHODCALLTYPE JS_QueryInterface(IDispatch FAR *This,
                                                   REFIID riid,
                                                   LPVOID FAR *ppvObj) {
  if (iid_eq(riid, &IID_IDispatch)) {
    *ppvObj = This;
    return S_OK;
  }
  *ppvObj = 0;
  return E_NOINTERFACE;
}
static ULONG STDMETHODCALLTYPE JS_AddRef(IDispatch FAR *This) { return 1; }
static ULONG STDMETHODCALLTYPE JS_Release(IDispatch FAR *This) { return 1; }
static HRESULT STDMETHODCALLTYPE JS_GetTypeInfoCount(IDispatch FAR *This,
                                                     UINT *pctinfo) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE JS_GetTypeInfo(IDispatch FAR *This,
                                                UINT iTInfo, LCID lcid,
                                                ITypeInfo **ppTInfo) {
  return S_OK;
}
#define WEBVIEW_JS_INVOKE_ID 0x1000
static HRESULT STDMETHODCALLTYPE JS_GetIDsOfNames(IDispatch FAR *This,
                                                  REFIID riid,
                                                  LPOLESTR *rgszNames,
                                                  UINT cNames, LCID lcid,
                                                  DISPID *rgDispId) {
  if (cNames != 1) {
    return S_FALSE;
  }
  if (wcscmp(rgszNames[0], L"invoke") == 0) {
    rgDispId[0] = WEBVIEW_JS_INVOKE_ID;
    return S_OK;
  }
  return S_FALSE;
}

static HRESULT STDMETHODCALLTYPE
JS_Invoke(IDispatch FAR *This, DISPID dispIdMember, REFIID riid, LCID lcid,
          WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult,
          EXCEPINFO *pExcepInfo, UINT *puArgErr) {
  size_t offset = (size_t) & ((_IOleClientSiteEx *)NULL)->external;
  _IOleClientSiteEx *ex = (_IOleClientSiteEx *)((char *)(This)-offset);
  webview_t *w = (webview_t *)GetWindowLongPtr(
      ex->inplace.frame.window, GWLP_USERDATA);
  if (pDispParams->cArgs == 1 && pDispParams->rgvarg[0].vt == VT_BSTR) {
    BSTR bstr = pDispParams->rgvarg[0].bstrVal;
    char *s = webview_from_utf16(bstr);
    if (s != NULL) {
      if (dispIdMember == WEBVIEW_JS_INVOKE_ID) {
        if (w->external_invoke_cb != NULL) {
          w->external_invoke_cb(w, s);
        }
      } else {
        return S_FALSE;
      }
      GlobalFree(s);
    }
  }
  return S_OK;
}

static IDispatchVtbl ExternalDispatchTable = {
    JS_QueryInterface, JS_AddRef,        JS_Release, JS_GetTypeInfoCount,
    JS_GetTypeInfo,    JS_GetIDsOfNames, JS_Invoke};

static ULONG STDMETHODCALLTYPE Site_AddRef(IOleClientSite FAR *This) {
  return 1;
}
static ULONG STDMETHODCALLTYPE Site_Release(IOleClientSite FAR *This) {
  return 1;
}
static HRESULT STDMETHODCALLTYPE Site_SaveObject(IOleClientSite FAR *This) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Site_GetMoniker(IOleClientSite FAR *This,
                                                 DWORD dwAssign,
                                                 DWORD dwWhichMoniker,
                                                 IMoniker **ppmk) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
Site_GetContainer(IOleClientSite FAR *This, LPOLECONTAINER FAR *ppContainer) {
  *ppContainer = 0;
  return E_NOINTERFACE;
}
static HRESULT STDMETHODCALLTYPE Site_ShowObject(IOleClientSite FAR *This) {
  return NOERROR;
}
static HRESULT STDMETHODCALLTYPE Site_OnShowWindow(IOleClientSite FAR *This,
                                                   BOOL fShow) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
Site_RequestNewObjectLayout(IOleClientSite FAR *This) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Site_QueryInterface(IOleClientSite FAR *This,
                                                     REFIID riid,
                                                     void **ppvObject) {
  if (iid_eq(riid, &IID_IUnknown) || iid_eq(riid, &IID_IOleClientSite)) {
    *ppvObject = &((_IOleClientSiteEx *)This)->client;
  } else if (iid_eq(riid, &IID_IOleInPlaceSite)) {
    *ppvObject = &((_IOleClientSiteEx *)This)->inplace;
  } else if (iid_eq(riid, &IID_IDocHostUIHandler)) {
    *ppvObject = &((_IOleClientSiteEx *)This)->ui;
  } else {
    *ppvObject = 0;
    return (E_NOINTERFACE);
  }
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE InPlace_QueryInterface(
    IOleInPlaceSite FAR *This, REFIID riid, LPVOID FAR *ppvObj) {
  return (Site_QueryInterface(
      (IOleClientSite *)((char *)This - sizeof(IOleClientSite)), riid, ppvObj));
}
static ULONG STDMETHODCALLTYPE InPlace_AddRef(IOleInPlaceSite FAR *This) {
  return 1;
}
static ULONG STDMETHODCALLTYPE InPlace_Release(IOleInPlaceSite FAR *This) {
  return 1;
}
static HRESULT STDMETHODCALLTYPE InPlace_GetWindow(IOleInPlaceSite FAR *This,
                                                   HWND FAR *lphwnd) {
  *lphwnd = ((_IOleInPlaceSiteEx FAR *)This)->frame.window;
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
InPlace_ContextSensitiveHelp(IOleInPlaceSite FAR *This, BOOL fEnterMode) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
InPlace_CanInPlaceActivate(IOleInPlaceSite FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
InPlace_OnInPlaceActivate(IOleInPlaceSite FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
InPlace_OnUIActivate(IOleInPlaceSite FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE InPlace_GetWindowContext(
    IOleInPlaceSite FAR *This, LPOLEINPLACEFRAME FAR *lplpFrame,
    LPOLEINPLACEUIWINDOW FAR *lplpDoc, LPRECT lprcPosRect, LPRECT lprcClipRect,
    LPOLEINPLACEFRAMEINFO lpFrameInfo) {
  *lplpFrame = (LPOLEINPLACEFRAME) & ((_IOleInPlaceSiteEx *)This)->frame;
  *lplpDoc = 0;
  lpFrameInfo->fMDIApp = FALSE;
  lpFrameInfo->hwndFrame = ((_IOleInPlaceFrameEx *)*lplpFrame)->window;
  lpFrameInfo->haccel = 0;
  lpFrameInfo->cAccelEntries = 0;
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE InPlace_Scroll(IOleInPlaceSite FAR *This,
                                                SIZE scrollExtent) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
InPlace_OnUIDeactivate(IOleInPlaceSite FAR *This, BOOL fUndoable) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
InPlace_OnInPlaceDeactivate(IOleInPlaceSite FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
InPlace_DiscardUndoState(IOleInPlaceSite FAR *This) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
InPlace_DeactivateAndUndo(IOleInPlaceSite FAR *This) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE
InPlace_OnPosRectChange(IOleInPlaceSite FAR *This, LPCRECT lprcPosRect) {
  IOleObject *browserObject;
  IOleInPlaceObject *inplace;
  browserObject = *((IOleObject **)((char *)This - sizeof(IOleObject *) -
                                    sizeof(IOleClientSite)));
  if (!browserObject->lpVtbl->QueryInterface(browserObject,
                                             iid_unref(&IID_IOleInPlaceObject),
                                             (void **)&inplace)) {
    inplace->lpVtbl->SetObjectRects(inplace, lprcPosRect, lprcPosRect);
    inplace->lpVtbl->Release(inplace);
  }
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE Frame_QueryInterface(
    IOleInPlaceFrame FAR *This, REFIID riid, LPVOID FAR *ppvObj) {
  return E_NOTIMPL;
}
static ULONG STDMETHODCALLTYPE Frame_AddRef(IOleInPlaceFrame FAR *This) {
  return 1;
}
static ULONG STDMETHODCALLTYPE Frame_Release(IOleInPlaceFrame FAR *This) {
  return 1;
}
static HRESULT STDMETHODCALLTYPE Frame_GetWindow(IOleInPlaceFrame FAR *This,
                                                 HWND FAR *lphwnd) {
  *lphwnd = ((_IOleInPlaceFrameEx *)This)->window;
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
Frame_ContextSensitiveHelp(IOleInPlaceFrame FAR *This, BOOL fEnterMode) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_GetBorder(IOleInPlaceFrame FAR *This,
                                                 LPRECT lprectBorder) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_RequestBorderSpace(
    IOleInPlaceFrame FAR *This, LPCBORDERWIDTHS pborderwidths) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_SetBorderSpace(
    IOleInPlaceFrame FAR *This, LPCBORDERWIDTHS pborderwidths) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_SetActiveObject(
    IOleInPlaceFrame FAR *This, IOleInPlaceActiveObject *pActiveObject,
    LPCOLESTR pszObjName) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
Frame_InsertMenus(IOleInPlaceFrame FAR *This, HMENU hmenuShared,
                  LPOLEMENUGROUPWIDTHS lpMenuWidths) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_SetMenu(IOleInPlaceFrame FAR *This,
                                               HMENU hmenuShared,
                                               HOLEMENU holemenu,
                                               HWND hwndActiveObject) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE Frame_RemoveMenus(IOleInPlaceFrame FAR *This,
                                                   HMENU hmenuShared) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE Frame_SetStatusText(IOleInPlaceFrame FAR *This,
                                                     LPCOLESTR pszStatusText) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
Frame_EnableModeless(IOleInPlaceFrame FAR *This, BOOL fEnable) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
Frame_TranslateAccelerator(IOleInPlaceFrame FAR *This, LPMSG lpmsg, WORD wID) {
  return E_NOTIMPL;
}
static HRESULT STDMETHODCALLTYPE UI_QueryInterface(IDocHostUIHandler FAR *This,
                                                   REFIID riid,
                                                   LPVOID FAR *ppvObj) {
  return (Site_QueryInterface((IOleClientSite *)((char *)This -
                                                 sizeof(IOleClientSite) -
                                                 sizeof(_IOleInPlaceSiteEx)),
                              riid, ppvObj));
}
static ULONG STDMETHODCALLTYPE UI_AddRef(IDocHostUIHandler FAR *This) {
  return 1;
}
static ULONG STDMETHODCALLTYPE UI_Release(IDocHostUIHandler FAR *This) {
  return 1;
}
static HRESULT STDMETHODCALLTYPE UI_ShowContextMenu(
    IDocHostUIHandler FAR *This, DWORD dwID, POINT __RPC_FAR *ppt,
    IUnknown __RPC_FAR *pcmdtReserved, IDispatch __RPC_FAR *pdispReserved) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
UI_GetHostInfo(IDocHostUIHandler FAR *This, DOCHOSTUIINFO __RPC_FAR *pInfo) {
  pInfo->cbSize = sizeof(DOCHOSTUIINFO);
  pInfo->dwFlags = DOCHOSTUIFLAG_NO3DBORDER;
  pInfo->dwDoubleClick = DOCHOSTUIDBLCLK_DEFAULT;
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE UI_ShowUI(
    IDocHostUIHandler FAR *This, DWORD dwID,
    IOleInPlaceActiveObject __RPC_FAR *pActiveObject,
    IOleCommandTarget __RPC_FAR *pCommandTarget,
    IOleInPlaceFrame __RPC_FAR *pFrame, IOleInPlaceUIWindow __RPC_FAR *pDoc) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE UI_HideUI(IDocHostUIHandler FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE UI_UpdateUI(IDocHostUIHandler FAR *This) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE UI_EnableModeless(IDocHostUIHandler FAR *This,
                                                   BOOL fEnable) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
UI_OnDocWindowActivate(IDocHostUIHandler FAR *This, BOOL fActivate) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
UI_OnFrameWindowActivate(IDocHostUIHandler FAR *This, BOOL fActivate) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
UI_ResizeBorder(IDocHostUIHandler FAR *This, LPCRECT prcBorder,
                IOleInPlaceUIWindow __RPC_FAR *pUIWindow, BOOL fRameWindow) {
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE
UI_TranslateAccelerator(IDocHostUIHandler FAR *This, LPMSG lpMsg,
                        const GUID __RPC_FAR *pguidCmdGroup, DWORD nCmdID) {
  return S_FALSE;
}
static HRESULT STDMETHODCALLTYPE UI_GetOptionKeyPath(
    IDocHostUIHandler FAR *This, LPOLESTR __RPC_FAR *pchKey, DWORD dw) {
  return S_FALSE;
}
static HRESULT STDMETHODCALLTYPE UI_GetDropTarget(
    IDocHostUIHandler FAR *This, IDropTarget __RPC_FAR *pDropTarget,
    IDropTarget __RPC_FAR *__RPC_FAR *ppDropTarget) {
  return S_FALSE;
}
static HRESULT STDMETHODCALLTYPE UI_GetExternal(
    IDocHostUIHandler FAR *This, IDispatch __RPC_FAR *__RPC_FAR *ppDispatch) {
  *ppDispatch = (IDispatch *)(This + 1);
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE UI_TranslateUrl(
    IDocHostUIHandler FAR *This, DWORD dwTranslate, OLECHAR __RPC_FAR *pchURLIn,
    OLECHAR __RPC_FAR *__RPC_FAR *ppchURLOut) {
  *ppchURLOut = 0;
  return S_FALSE;
}
static HRESULT STDMETHODCALLTYPE
UI_FilterDataObject(IDocHostUIHandler FAR *This, IDataObject __RPC_FAR *pDO,
                    IDataObject __RPC_FAR *__RPC_FAR *ppDORet) {
  *ppDORet = 0;
  return S_FALSE;
}

static const TCHAR *classname = "WebView";
static const SAFEARRAYBOUND ArrayBound = {1, 0};

static IOleClientSiteVtbl MyIOleClientSiteTable = {
    Site_QueryInterface, Site_AddRef,       Site_Release,
    Site_SaveObject,     Site_GetMoniker,   Site_GetContainer,
    Site_ShowObject,     Site_OnShowWindow, Site_RequestNewObjectLayout};
static IOleInPlaceSiteVtbl MyIOleInPlaceSiteTable = {
    InPlace_QueryInterface,
    InPlace_AddRef,
    InPlace_Release,
    InPlace_GetWindow,
    InPlace_ContextSensitiveHelp,
    InPlace_CanInPlaceActivate,
    InPlace_OnInPlaceActivate,
    InPlace_OnUIActivate,
    InPlace_GetWindowContext,
    InPlace_Scroll,
    InPlace_OnUIDeactivate,
    InPlace_OnInPlaceDeactivate,
    InPlace_DiscardUndoState,
    InPlace_DeactivateAndUndo,
    InPlace_OnPosRectChange};

static IOleInPlaceFrameVtbl MyIOleInPlaceFrameTable = {
    Frame_QueryInterface,
    Frame_AddRef,
    Frame_Release,
    Frame_GetWindow,
    Frame_ContextSensitiveHelp,
    Frame_GetBorder,
    Frame_RequestBorderSpace,
    Frame_SetBorderSpace,
    Frame_SetActiveObject,
    Frame_InsertMenus,
    Frame_SetMenu,
    Frame_RemoveMenus,
    Frame_SetStatusText,
    Frame_EnableModeless,
    Frame_TranslateAccelerator};

static IDocHostUIHandlerVtbl MyIDocHostUIHandlerTable = {
    UI_QueryInterface,
    UI_AddRef,
    UI_Release,
    UI_ShowContextMenu,
    UI_GetHostInfo,
    UI_ShowUI,
    UI_HideUI,
    UI_UpdateUI,
    UI_EnableModeless,
    UI_OnDocWindowActivate,
    UI_OnFrameWindowActivate,
    UI_ResizeBorder,
    UI_TranslateAccelerator,
    UI_GetOptionKeyPath,
    UI_GetDropTarget,
    UI_GetExternal,
    UI_TranslateUrl,
    UI_FilterDataObject};

static void UnEmbedBrowserObject(webview_t *w) {
  if (w->priv.browser != NULL) {
    (*w->priv.browser)->lpVtbl->Close(*w->priv.browser, OLECLOSE_NOSAVE);
    (*w->priv.browser)->lpVtbl->Release(*w->priv.browser);
    GlobalFree(w->priv.browser);
    w->priv.browser = NULL;
  }
}

static int EmbedBrowserObject(webview_t *w) {
  RECT rect;
  IWebBrowser2 *webBrowser2 = NULL;
  LPCLASSFACTORY pClassFactory = NULL;
  _IOleClientSiteEx *_iOleClientSiteEx = NULL;
  IOleObject **browser = (IOleObject **)GlobalAlloc(
      GMEM_FIXED, sizeof(IOleObject *) + sizeof(_IOleClientSiteEx));
  if (browser == NULL) {
    goto error;
  }
  w->priv.browser = browser;

  _iOleClientSiteEx = (_IOleClientSiteEx *)(browser + 1);
  _iOleClientSiteEx->client.lpVtbl = &MyIOleClientSiteTable;
  _iOleClientSiteEx->inplace.inplace.lpVtbl = &MyIOleInPlaceSiteTable;
  _iOleClientSiteEx->inplace.frame.frame.lpVtbl = &MyIOleInPlaceFrameTable;
  _iOleClientSiteEx->inplace.frame.window = w->priv.hwnd;
  _iOleClientSiteEx->ui.ui.lpVtbl = &MyIDocHostUIHandlerTable;
  _iOleClientSiteEx->external.lpVtbl = &ExternalDispatchTable;

  if (CoGetClassObject(iid_unref(&CLSID_WebBrowser),
                       CLSCTX_INPROC_SERVER | CLSCTX_INPROC_HANDLER, NULL,
                       iid_unref(&IID_IClassFactory),
                       (void **)&pClassFactory) != S_OK) {
    goto error;
  }

  if (pClassFactory == NULL) {
    goto error;
  }

  if (pClassFactory->lpVtbl->CreateInstance(pClassFactory, 0,
                                            iid_unref(&IID_IOleObject),
                                            (void **)browser) != S_OK) {
    goto error;
  }
  pClassFactory->lpVtbl->Release(pClassFactory);
  if ((*browser)->lpVtbl->SetClientSite(
          *browser, (IOleClientSite *)_iOleClientSiteEx) != S_OK) {
    goto error;
  }
  (*browser)->lpVtbl->SetHostNames(*browser, L"My Host Name", 0);

  if (OleSetContainedObject((struct IUnknown *)(*browser), TRUE) != S_OK) {
    goto error;
  }
  GetClientRect(w->priv.hwnd, &rect);
  if ((*browser)->lpVtbl->DoVerb((*browser), OLEIVERB_SHOW, NULL,
                                 (IOleClientSite *)_iOleClientSiteEx, -1,
                                 w->priv.hwnd, &rect) != S_OK) {
    goto error;
  }
  if ((*browser)->lpVtbl->QueryInterface((*browser),
                                         iid_unref(&IID_IWebBrowser2),
                                         (void **)&webBrowser2) != S_OK) {
    goto error;
  }

  webBrowser2->lpVtbl->put_Left(webBrowser2, 0);
  webBrowser2->lpVtbl->put_Top(webBrowser2, 0);
  webBrowser2->lpVtbl->put_Width(webBrowser2, rect.right);
  webBrowser2->lpVtbl->put_Height(webBrowser2, rect.bottom);
  webBrowser2->lpVtbl->Release(webBrowser2);

  return 0;
error:
  UnEmbedBrowserObject(w);
  if (pClassFactory != NULL) {
    pClassFactory->lpVtbl->Release(pClassFactory);
  }
  if (browser != NULL) {
    GlobalFree(browser);
  }
  return -1;
}

#define WEBVIEW_DATA_URL_PREFIX "data:text/html,"
static int DisplayHTMLPage(webview_t *w, const struct webview_conf *c) {
  IWebBrowser2 *webBrowser2;
  VARIANT myURL;
  LPDISPATCH lpDispatch;
  IHTMLDocument2 *htmlDoc2;
  BSTR bstr;
  IOleObject *browserObject;
  SAFEARRAY *sfArray;
  VARIANT *pVar;
  browserObject = *w->priv.browser;
  int isDataURL = 0;
  const char *webview_url = webview_check_url(c->url);
  if (!browserObject->lpVtbl->QueryInterface(
          browserObject, iid_unref(&IID_IWebBrowser2), (void **)&webBrowser2)) {
    LPCSTR webPageName;
    isDataURL = (strncmp(webview_url, WEBVIEW_DATA_URL_PREFIX,
                         strlen(WEBVIEW_DATA_URL_PREFIX)) == 0);
    if (isDataURL) {
      webPageName = "about:blank";
    } else {
      webPageName = (LPCSTR)webview_url;
    }
    VariantInit(&myURL);
    myURL.vt = VT_BSTR;
#ifndef UNICODE
    {
      wchar_t *buffer = webview_to_utf16(webPageName);
      if (buffer == NULL) {
        goto badalloc;
      }
      myURL.bstrVal = SysAllocString(buffer);
      GlobalFree(buffer);
    }
#else
    myURL.bstrVal = SysAllocString(webPageName);
#endif
    if (!myURL.bstrVal) {
    badalloc:
      webBrowser2->lpVtbl->Release(webBrowser2);
      return (-6);
    }
    webBrowser2->lpVtbl->Navigate2(webBrowser2, &myURL, 0, 0, 0, 0);
    VariantClear(&myURL);
    if (!isDataURL) {
      return 0;
    }

    const char *p = webview_url + strlen(WEBVIEW_DATA_URL_PREFIX);
    char *url = (char *)calloc(1, strlen(webview_url) + 1);
    char *q = url;
    do {
      if (*p == '%' && *(p + 1) && *(p + 2)) {
        unsigned it = 0;
        if (sscanf(p + 1, "%02x", &it) == 1) {
          p += 3;
          *q++ = it;
          continue;
        }
      }
      *q++ = *p++;
    }
    while (*p);

    if (webBrowser2->lpVtbl->get_Document(webBrowser2, &lpDispatch) == S_OK) {
      if (lpDispatch->lpVtbl->QueryInterface(lpDispatch,
                                             iid_unref(&IID_IHTMLDocument2),
                                             (void **)&htmlDoc2) == S_OK) {
        if ((sfArray = SafeArrayCreate(VT_VARIANT, 1,
                                       (SAFEARRAYBOUND *)&ArrayBound))) {
          if (!SafeArrayAccessData(sfArray, (void **)&pVar)) {
            pVar->vt = VT_BSTR;
#ifndef UNICODE
            {
              wchar_t *buffer = webview_to_utf16(url);
              if (buffer == NULL) {
                goto release;
              }
              bstr = SysAllocString(buffer);
              GlobalFree(buffer);
            }
#else
            bstr = SysAllocString(string);
#endif
            if ((pVar->bstrVal = bstr)) {
              htmlDoc2->lpVtbl->write(htmlDoc2, sfArray);
              htmlDoc2->lpVtbl->close(htmlDoc2);
            }
          }
          SafeArrayDestroy(sfArray);
        }
      release:
        free(url);
        htmlDoc2->lpVtbl->Release(htmlDoc2);
      }
      lpDispatch->lpVtbl->Release(lpDispatch);
    }
    webBrowser2->lpVtbl->Release(webBrowser2);
    return (0);
  }
  return (-5);
}

static LRESULT CALLBACK wndproc(HWND hwnd, UINT uMsg, WPARAM wParam,
                                LPARAM lParam) {
  webview_t *w = (webview_t *)GetWindowLongPtr(hwnd, GWLP_USERDATA);
  switch (uMsg) {
  case WM_CREATE:
    w = (webview_t *)((CREATESTRUCT *)lParam)->lpCreateParams;
    w->priv.hwnd = hwnd;
    return EmbedBrowserObject(w);
  case WM_DESTROY:
    UnEmbedBrowserObject(w);
    PostQuitMessage(0);
    return TRUE;
  case WM_SIZE: {
    IWebBrowser2 *webBrowser2;
    IOleObject *browser = *w->priv.browser;
    if (browser->lpVtbl->QueryInterface(browser, iid_unref(&IID_IWebBrowser2),
                                        (void **)&webBrowser2) == S_OK) {
      RECT rect;
      GetClientRect(hwnd, &rect);
      webBrowser2->lpVtbl->put_Width(webBrowser2, rect.right);
      webBrowser2->lpVtbl->put_Height(webBrowser2, rect.bottom);
    }
    return TRUE;
  }
  case WM_WEBVIEW_DISPATCH: {
    webview_dispatch_fn f = (webview_dispatch_fn)wParam;
    void *arg = (void *)lParam;
    (*f)(w, arg);
    return TRUE;
  }
  }
  return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

#define WEBVIEW_KEY_FEATURE_BROWSER_EMULATION                                  \
  "Software\\Microsoft\\Internet "                                             \
  "Explorer\\Main\\FeatureControl\\FEATURE_BROWSER_EMULATION"

static int webview_fix_ie_compat_mode() {
  HKEY hKey;
  DWORD ie_version = 11000;
  TCHAR appname[MAX_PATH + 1];
  TCHAR *p;
  if (GetModuleFileName(NULL, appname, MAX_PATH + 1) == 0) {
    return -1;
  }
  for (p = &appname[strlen(appname) - 1]; p != appname && *p != '\\'; p--) {
  }
  p++;
  if (RegCreateKey(HKEY_CURRENT_USER, WEBVIEW_KEY_FEATURE_BROWSER_EMULATION,
                   &hKey) != ERROR_SUCCESS) {
    return -1;
  }
  if (RegSetValueEx(hKey, p, 0, REG_DWORD, (BYTE *)&ie_version,
                    sizeof(ie_version)) != ERROR_SUCCESS) {
    RegCloseKey(hKey);
    return -1;
  }
  RegCloseKey(hKey);
  return 0;
}

int webview_init(webview_t *w, const struct webview_conf *c) {
  WNDCLASSEX wc;
  HINSTANCE hInstance;
  STARTUPINFO info;
  DWORD style;
  RECT clientRect;
  RECT rect;

  if (webview_fix_ie_compat_mode() < 0) {
    return -1;
  }

  hInstance = GetModuleHandle(NULL);
  if (hInstance == NULL) {
    return -1;
  }
  GetStartupInfo(&info);
  if (OleInitialize(NULL) != S_OK) {
    return -1;
  }
  ZeroMemory(&wc, sizeof(WNDCLASSEX));
  wc.cbSize = sizeof(WNDCLASSEX);
  wc.hInstance = hInstance;
  wc.lpfnWndProc = wndproc;
  wc.lpszClassName = classname;
  RegisterClassEx(&wc);

  style = WS_OVERLAPPEDWINDOW;
  if (!c->resizable) {
    style = WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU;
  }

  rect.left = 0;
  rect.top = 0;
  rect.right = c->width;
  rect.bottom = c->height;
  AdjustWindowRect(&rect, WS_OVERLAPPEDWINDOW, 0);

  GetClientRect(GetDesktopWindow(), &clientRect);
  int left = (clientRect.right / 2) - ((rect.right - rect.left) / 2);
  int top = (clientRect.bottom / 2) - ((rect.bottom - rect.top) / 2);
  rect.right = rect.right - rect.left + left;
  rect.left = left;
  rect.bottom = rect.bottom - rect.top + top;
  rect.top = top;

  w->priv.hwnd =
      CreateWindowEx(0, classname, c->title, style, rect.left, rect.top,
                     rect.right - rect.left, rect.bottom - rect.top,
                     HWND_DESKTOP, NULL, hInstance, (void *)w);
  if (w->priv.hwnd == 0) {
    OleUninitialize();
    return -1;
  }

  SetWindowLongPtr(w->priv.hwnd, GWLP_USERDATA, (LONG_PTR)w);

  DisplayHTMLPage(w, c);

  SetWindowText(w->priv.hwnd, c->title);
  ShowWindow(w->priv.hwnd, info.wShowWindow);
  UpdateWindow(w->priv.hwnd);
  SetFocus(w->priv.hwnd);

  return 0;
}

int webview_loop(webview_t *w, int blocking) {
  MSG msg;
  if (blocking) {
    GetMessage(&msg, 0, 0, 0);
  } else {
    PeekMessage(&msg, 0, 0, 0, PM_REMOVE);
  }
  switch (msg.message) {
  case WM_QUIT:
    return -1;
  case WM_COMMAND:
  case WM_KEYDOWN:
  case WM_KEYUP: {
    HRESULT r = S_OK;
    IWebBrowser2 *webBrowser2;
    IOleObject *browser = *w->priv.browser;
    if (browser->lpVtbl->QueryInterface(browser, iid_unref(&IID_IWebBrowser2),
                                        (void **)&webBrowser2) == S_OK) {
      IOleInPlaceActiveObject *pIOIPAO;
      if (browser->lpVtbl->QueryInterface(
              browser, iid_unref(&IID_IOleInPlaceActiveObject),
              (void **)&pIOIPAO) == S_OK) {
        r = pIOIPAO->lpVtbl->TranslateAccelerator(pIOIPAO, &msg);
        pIOIPAO->lpVtbl->Release(pIOIPAO);
      }
      webBrowser2->lpVtbl->Release(webBrowser2);
    }
    if (r != S_FALSE) {
      break;
    }
  }
  default:
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return 0;
}

int webview_eval(webview_t *w, const char *js) {
  IWebBrowser2 *webBrowser2;
  IHTMLDocument2 *htmlDoc2;
  IDispatch *docDispatch;
  IDispatch *scriptDispatch;
  if ((*w->priv.browser)
          ->lpVtbl->QueryInterface((*w->priv.browser),
                                   iid_unref(&IID_IWebBrowser2),
                                   (void **)&webBrowser2) != S_OK) {
    return -1;
  }

  if (webBrowser2->lpVtbl->get_Document(webBrowser2, &docDispatch) != S_OK) {
    return -1;
  }
  if (docDispatch->lpVtbl->QueryInterface(docDispatch,
                                          iid_unref(&IID_IHTMLDocument2),
                                          (void **)&htmlDoc2) != S_OK) {
    return -1;
  }
  if (htmlDoc2->lpVtbl->get_Script(htmlDoc2, &scriptDispatch) != S_OK) {
    return -1;
  }
  DISPID dispid;
  BSTR evalStr = SysAllocString(L"eval");
  if (scriptDispatch->lpVtbl->GetIDsOfNames(
          scriptDispatch, iid_unref(&IID_NULL), &evalStr, 1,
          LOCALE_SYSTEM_DEFAULT, &dispid) != S_OK) {
    SysFreeString(evalStr);
    return -1;
  }
  SysFreeString(evalStr);

  DISPPARAMS params;
  VARIANT arg;
  VARIANT result;
  EXCEPINFO excepInfo;
  UINT nArgErr = (UINT)-1;
  params.cArgs = 1;
  params.cNamedArgs = 0;
  params.rgvarg = &arg;
  arg.vt = VT_BSTR;
  static const char *prologue = "(function(){";
  static const char *epilogue = ";})();";
  int n = strlen(prologue) + strlen(epilogue) + strlen(js) + 1;
  char *eval = (char *)malloc(n);
  snprintf(eval, n, "%s%s%s", prologue, js, epilogue);
  wchar_t *buf = webview_to_utf16(eval);
  if (buf == NULL) {
    return -1;
  }
  arg.bstrVal = SysAllocString(buf);
  if (scriptDispatch->lpVtbl->Invoke(
          scriptDispatch, dispid, iid_unref(&IID_NULL), 0, DISPATCH_METHOD,
          &params, &result, &excepInfo, &nArgErr) != S_OK) {
    return -1;
  }
  SysFreeString(arg.bstrVal);
  free(eval);
  scriptDispatch->lpVtbl->Release(scriptDispatch);
  htmlDoc2->lpVtbl->Release(htmlDoc2);
  docDispatch->lpVtbl->Release(docDispatch);
  return 0;
}

void webview_dispatch(webview_t *w, webview_dispatch_fn fn,
                                  void *arg) {
  PostMessageW(w->priv.hwnd, WM_WEBVIEW_DISPATCH, (WPARAM)fn, (LPARAM)arg);
}

void webview_set_title(webview_t *w, const char *title) {
  SetWindowText(w->priv.hwnd, title);
}

void webview_set_fullscreen(webview_t *w, int fullscreen) {
  if (w->priv.is_fullscreen == !!fullscreen) {
    return;
  }
  if (w->priv.is_fullscreen == 0) {
    w->priv.saved_style = GetWindowLong(w->priv.hwnd, GWL_STYLE);
    w->priv.saved_ex_style = GetWindowLong(w->priv.hwnd, GWL_EXSTYLE);
    GetWindowRect(w->priv.hwnd, &w->priv.saved_rect);
  }
  w->priv.is_fullscreen = !!fullscreen;
  if (fullscreen) {
    MONITORINFO monitor_info;
    SetWindowLong(w->priv.hwnd, GWL_STYLE,
                  w->priv.saved_style & ~(WS_CAPTION | WS_THICKFRAME));
    SetWindowLong(w->priv.hwnd, GWL_EXSTYLE,
                  w->priv.saved_ex_style &
                      ~(WS_EX_DLGMODALFRAME | WS_EX_WINDOWEDGE |
                        WS_EX_CLIENTEDGE | WS_EX_STATICEDGE));
    monitor_info.cbSize = sizeof(monitor_info);
    GetMonitorInfo(MonitorFromWindow(w->priv.hwnd, MONITOR_DEFAULTTONEAREST),
                   &monitor_info);
    RECT r;
    r.left = monitor_info.rcMonitor.left;
    r.top = monitor_info.rcMonitor.top;
    r.right = monitor_info.rcMonitor.right;
    r.bottom = monitor_info.rcMonitor.bottom;
    SetWindowPos(w->priv.hwnd, NULL, r.left, r.top, r.right - r.left,
                 r.bottom - r.top,
                 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
  } else {
    SetWindowLong(w->priv.hwnd, GWL_STYLE, w->priv.saved_style);
    SetWindowLong(w->priv.hwnd, GWL_EXSTYLE, w->priv.saved_ex_style);
    SetWindowPos(w->priv.hwnd, NULL, w->priv.saved_rect.left,
                 w->priv.saved_rect.top,
                 w->priv.saved_rect.right - w->priv.saved_rect.left,
                 w->priv.saved_rect.bottom - w->priv.saved_rect.top,
                 SWP_NOZORDER | SWP_NOACTIVATE | SWP_FRAMECHANGED);
  }
}

/* These are missing parts from MinGW */
#ifndef __IFileDialog_INTERFACE_DEFINED__
#define __IFileDialog_INTERFACE_DEFINED__
enum _FILEOPENDIALOGOPTIONS {
  FOS_OVERWRITEPROMPT = 0x2,
  FOS_STRICTFILETYPES = 0x4,
  FOS_NOCHANGEDIR = 0x8,
  FOS_PICKFOLDERS = 0x20,
  FOS_FORCEFILESYSTEM = 0x40,
  FOS_ALLNONSTORAGEITEMS = 0x80,
  FOS_NOVALIDATE = 0x100,
  FOS_ALLOWMULTISELECT = 0x200,
  FOS_PATHMUSTEXIST = 0x800,
  FOS_FILEMUSTEXIST = 0x1000,
  FOS_CREATEPROMPT = 0x2000,
  FOS_SHAREAWARE = 0x4000,
  FOS_NOREADONLYRETURN = 0x8000,
  FOS_NOTESTFILECREATE = 0x10000,
  FOS_HIDEMRUPLACES = 0x20000,
  FOS_HIDEPINNEDPLACES = 0x40000,
  FOS_NODEREFERENCELINKS = 0x100000,
  FOS_DONTADDTORECENT = 0x2000000,
  FOS_FORCESHOWHIDDEN = 0x10000000,
  FOS_DEFAULTNOMINIMODE = 0x20000000,
  FOS_FORCEPREVIEWPANEON = 0x40000000
};
typedef DWORD FILEOPENDIALOGOPTIONS;
typedef enum FDAP { FDAP_BOTTOM = 0, FDAP_TOP = 1 } FDAP;
DEFINE_GUID(IID_IFileDialog, 0x42f85136, 0xdb7e, 0x439c, 0x85, 0xf1, 0xe4, 0x07,
            0x5d, 0x13, 0x5f, 0xc8);
typedef struct IFileDialogVtbl {
  BEGIN_INTERFACE
  HRESULT(STDMETHODCALLTYPE *QueryInterface)
  (IFileDialog *This, REFIID riid, void **ppvObject);
  ULONG(STDMETHODCALLTYPE *AddRef)(IFileDialog *This);
  ULONG(STDMETHODCALLTYPE *Release)(IFileDialog *This);
  HRESULT(STDMETHODCALLTYPE *Show)(IFileDialog *This, HWND hwndOwner);
  HRESULT(STDMETHODCALLTYPE *SetFileTypes)
  (IFileDialog *This, UINT cFileTypes, const COMDLG_FILTERSPEC *rgFilterSpec);
  HRESULT(STDMETHODCALLTYPE *SetFileTypeIndex)
  (IFileDialog *This, UINT iFileType);
  HRESULT(STDMETHODCALLTYPE *GetFileTypeIndex)
  (IFileDialog *This, UINT *piFileType);
  HRESULT(STDMETHODCALLTYPE *Advise)
  (IFileDialog *This, IFileDialogEvents *pfde, DWORD *pdwCookie);
  HRESULT(STDMETHODCALLTYPE *Unadvise)(IFileDialog *This, DWORD dwCookie);
  HRESULT(STDMETHODCALLTYPE *SetOptions)
  (IFileDialog *This, FILEOPENDIALOGOPTIONS fos);
  HRESULT(STDMETHODCALLTYPE *GetOptions)
  (IFileDialog *This, FILEOPENDIALOGOPTIONS *pfos);
  HRESULT(STDMETHODCALLTYPE *SetDefaultFolder)
  (IFileDialog *This, IShellItem *psi);
  HRESULT(STDMETHODCALLTYPE *SetFolder)(IFileDialog *This, IShellItem *psi);
  HRESULT(STDMETHODCALLTYPE *GetFolder)(IFileDialog *This, IShellItem **ppsi);
  HRESULT(STDMETHODCALLTYPE *GetCurrentSelection)
  (IFileDialog *This, IShellItem **ppsi);
  HRESULT(STDMETHODCALLTYPE *SetFileName)(IFileDialog *This, LPCWSTR pszName);
  HRESULT(STDMETHODCALLTYPE *GetFileName)(IFileDialog *This, LPWSTR *pszName);
  HRESULT(STDMETHODCALLTYPE *SetTitle)(IFileDialog *This, LPCWSTR pszTitle);
  HRESULT(STDMETHODCALLTYPE *SetOkButtonLabel)
  (IFileDialog *This, LPCWSTR pszText);
  HRESULT(STDMETHODCALLTYPE *SetFileNameLabel)
  (IFileDialog *This, LPCWSTR pszLabel);
  HRESULT(STDMETHODCALLTYPE *GetResult)(IFileDialog *This, IShellItem **ppsi);
  HRESULT(STDMETHODCALLTYPE *AddPlace)
  (IFileDialog *This, IShellItem *psi, FDAP fdap);
  HRESULT(STDMETHODCALLTYPE *SetDefaultExtension)
  (IFileDialog *This, LPCWSTR pszDefaultExtension);
  HRESULT(STDMETHODCALLTYPE *Close)(IFileDialog *This, HRESULT hr);
  HRESULT(STDMETHODCALLTYPE *SetClientGuid)(IFileDialog *This, REFGUID guid);
  HRESULT(STDMETHODCALLTYPE *ClearClientData)(IFileDialog *This);
  HRESULT(STDMETHODCALLTYPE *SetFilter)
  (IFileDialog *This, IShellItemFilter *pFilter);
  END_INTERFACE
} IFileDialogVtbl;
interface IFileDialog {
  CONST_VTBL IFileDialogVtbl *lpVtbl;
};
DEFINE_GUID(IID_IFileOpenDialog, 0xd57c7288, 0xd4ad, 0x4768, 0xbe, 0x02, 0x9d,
            0x96, 0x95, 0x32, 0xd9, 0x60);
DEFINE_GUID(IID_IFileSaveDialog, 0x84bccd23, 0x5fde, 0x4cdb, 0xae, 0xa4, 0xaf,
            0x64, 0xb8, 0x3d, 0x78, 0xab);
#endif

void webview_dialog(webview_t *w,
                                webview_dialog_t dlgtype, int flags,
                                const char *title, const char *arg,
                                char *result, size_t resultsz) {
  if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
      dlgtype == WEBVIEW_DIALOG_TYPE_SAVE) {
    IFileDialog *dlg = NULL;
    IShellItem *res = NULL;
    WCHAR *ws = NULL;
    char *s = NULL;
    FILEOPENDIALOGOPTIONS opts, add_opts = 0;
    if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN) {
      if (CoCreateInstance(
              iid_unref(&CLSID_FileOpenDialog), NULL, CLSCTX_INPROC_SERVER,
              iid_unref(&IID_IFileOpenDialog), (void **)&dlg) != S_OK) {
        goto error_dlg;
      }
      if (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY) {
        add_opts |= FOS_PICKFOLDERS;
      }
      add_opts |= FOS_NOCHANGEDIR | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE |
                  FOS_PATHMUSTEXIST | FOS_FILEMUSTEXIST | FOS_SHAREAWARE |
                  FOS_NOTESTFILECREATE | FOS_NODEREFERENCELINKS |
                  FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE;
    } else {
      if (CoCreateInstance(
              iid_unref(&CLSID_FileSaveDialog), NULL, CLSCTX_INPROC_SERVER,
              iid_unref(&IID_IFileSaveDialog), (void **)&dlg) != S_OK) {
        goto error_dlg;
      }
      add_opts |= FOS_OVERWRITEPROMPT | FOS_NOCHANGEDIR |
                  FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE | FOS_SHAREAWARE |
                  FOS_NOTESTFILECREATE | FOS_NODEREFERENCELINKS |
                  FOS_FORCESHOWHIDDEN | FOS_DEFAULTNOMINIMODE;
    }
    if (dlg->lpVtbl->GetOptions(dlg, &opts) != S_OK) {
      goto error_dlg;
    }
    opts &= ~FOS_NOREADONLYRETURN;
    opts |= add_opts;
    if (dlg->lpVtbl->SetOptions(dlg, opts) != S_OK) {
      goto error_dlg;
    }
    if (dlg->lpVtbl->Show(dlg, w->priv.hwnd) != S_OK) {
      goto error_dlg;
    }
    if (dlg->lpVtbl->GetResult(dlg, &res) != S_OK) {
      goto error_dlg;
    }
    if (res->lpVtbl->GetDisplayName(res, SIGDN_FILESYSPATH, &ws) != S_OK) {
      goto error_result;
    }
    s = webview_from_utf16(ws);
    strncpy(result, s, resultsz);
    result[resultsz - 1] = '\0';
    CoTaskMemFree(ws);
  error_result:
    res->lpVtbl->Release(res);
  error_dlg:
    dlg->lpVtbl->Release(dlg);
    return;
  } else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT) {
#if 0
    /* MinGW often doesn't contain TaskDialog, we'll use MessageBox for now */
    WCHAR *wtitle = webview_to_utf16(title);
    WCHAR *warg = webview_to_utf16(arg);
    TaskDialog(w->priv.hwnd, NULL, NULL, wtitle, warg, 0, NULL, NULL);
    GlobalFree(warg);
    GlobalFree(wtitle);
#else
    UINT type = MB_OK;
    switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK) {
    case WEBVIEW_DIALOG_FLAG_INFO:
      type |= MB_ICONINFORMATION;
      break;
    case WEBVIEW_DIALOG_FLAG_WARNING:
      type |= MB_ICONWARNING;
      break;
    case WEBVIEW_DIALOG_FLAG_ERROR:
      type |= MB_ICONERROR;
      break;
    }
    MessageBox(w->priv.hwnd, arg, title, type);
#endif
  }
}

void webview_terminate(webview_t *w) { PostQuitMessage(0); }
void webview_exit(webview_t *w) { OleUninitialize(); }
void webview_print_log(const char *s) { OutputDebugString(s); }

#endif /* WEBVIEW_WINAPI */

#if defined(WEBVIEW_COCOA)
#if (!defined MAC_OS_X_VERSION_10_12) ||                                       \
    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_12
#define NSWindowStyleMaskResizable NSResizableWindowMask
#define NSWindowStyleMaskMiniaturizable NSMiniaturizableWindowMask
#define NSWindowStyleMaskTitled NSTitledWindowMask
#define NSWindowStyleMaskClosable NSClosableWindowMask
#define NSWindowStyleMaskFullScreen NSFullScreenWindowMask
#define NSEventMaskAny NSAnyEventMask
#define NSEventModifierFlagCommand NSCommandKeyMask
#define NSEventModifierFlagOption NSAlternateKeyMask
#define NSAlertStyleInformational NSInformationalAlertStyle
#endif /* MAC_OS_X_VERSION_10_12 */
#if (!defined MAC_OS_X_VERSION_10_13) ||                                       \
    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_13
#define NSModalResponseOK NSFileHandlingPanelOKButton
#endif /* MAC_OS_X_VERSION_10_12, MAC_OS_X_VERSION_10_13 */
static void webview_window_will_close(id self, SEL cmd, id notification) {
  webview_t *w =
      (webview_t *)objc_getAssociatedObject(self, "webview");
  webview_terminate(w);
}

static BOOL webview_is_selector_excluded_from_web_script(id self, SEL cmd,
                                                         SEL selector) {
  return selector != @selector(invoke:);
}

static NSString *webview_webscript_name_for_selector(id self, SEL cmd,
                                                     SEL selector) {
  return selector == @selector(invoke:) ? @"invoke" : nil;
}

static void webview_did_clear_window_object(id self, SEL cmd, id webview,
                                            id script, id frame) {
  [script setValue:self forKey:@"external"];
}

static void webview_external_invoke(id self, SEL cmd, id arg) {
  webview_t *w =
      (webview_t *)objc_getAssociatedObject(self, "webview");
  if (w == NULL || w->external_invoke_cb == NULL) {
    return;
  }
  if ([arg isKindOfClass:[NSString class]] == NO) {
    return;
  }
  w->external_invoke_cb(w, [(NSString *)(arg)UTF8String]);
}

int webview_init(webview_t *w, const struct webview_conf *c) {
  w->priv.pool = [[NSAutoreleasePool alloc] init];
  [NSApplication sharedApplication];

  Class webViewDelegateClass =
      objc_allocateClassPair([NSObject class], "WebViewDelegate", 0);
  class_addMethod(webViewDelegateClass, sel_registerName("windowWillClose:"),
                  (IMP)webview_window_will_close, "v@:@");
  class_addMethod(object_getClass(webViewDelegateClass),
                  sel_registerName("isSelectorExcludedFromWebScript:"),
                  (IMP)webview_is_selector_excluded_from_web_script, "c@::");
  class_addMethod(object_getClass(webViewDelegateClass),
                  sel_registerName("webScriptNameForSelector:"),
                  (IMP)webview_webscript_name_for_selector, "c@::");
  class_addMethod(webViewDelegateClass,
                  sel_registerName("webView:didClearWindowObject:forFrame:"),
                  (IMP)webview_did_clear_window_object, "v@:@@@");
  class_addMethod(webViewDelegateClass, sel_registerName("invoke:"),
                  (IMP)webview_external_invoke, "v@:@");
  objc_registerClassPair(webViewDelegateClass);

  w->priv.windowDelegate = [[webViewDelegateClass alloc] init];
  objc_setAssociatedObject(w->priv.windowDelegate, "webview", (id)(w),
                           OBJC_ASSOCIATION_ASSIGN);

  NSString *nsTitle = [NSString stringWithUTF8String:c->title];
  NSRect r = NSMakeRect(0, 0, c->width, c->height);
  NSUInteger style = NSWindowStyleMaskTitled | NSWindowStyleMaskClosable |
                     NSWindowStyleMaskMiniaturizable;
  if (c->resizable) {
    style = style | NSWindowStyleMaskResizable;
  }
  w->priv.window = [[NSWindow alloc] initWithContentRect:r
                                               styleMask:style
                                                 backing:NSBackingStoreBuffered
                                                   defer:NO];
  [w->priv.window autorelease];
  [w->priv.window setTitle:nsTitle];
  [w->priv.window setDelegate:w->priv.windowDelegate];
  [w->priv.window center];

  [[NSUserDefaults standardUserDefaults] setBool:!!c->debug
                                          forKey:@"WebKitDeveloperExtras"];
  [[NSUserDefaults standardUserDefaults] synchronize];
  w->priv.webview =
      [[WebView alloc] initWithFrame:r frameName:@"WebView" groupName:nil];
  NSURL *nsURL = [NSURL
      URLWithString:[NSString stringWithUTF8String:webview_check_url(c->url)]];
  [[w->priv.webview mainFrame] loadRequest:[NSURLRequest requestWithURL:nsURL]];

  [w->priv.webview setAutoresizesSubviews:YES];
  [w->priv.webview
      setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
  w->priv.webview.frameLoadDelegate = w->priv.windowDelegate;
  [[w->priv.window contentView] addSubview:w->priv.webview];
  [w->priv.window orderFrontRegardless];

  [NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
  [NSApp finishLaunching];
  [NSApp activateIgnoringOtherApps:YES];

  NSMenu *menubar = [[[NSMenu alloc] initWithTitle:@""] autorelease];

  NSString *appName = [[NSProcessInfo processInfo] processName];
  NSMenuItem *appMenuItem =
      [[[NSMenuItem alloc] initWithTitle:appName action:NULL keyEquivalent:@""]
          autorelease];
  NSMenu *appMenu = [[[NSMenu alloc] initWithTitle:appName] autorelease];
  [appMenuItem setSubmenu:appMenu];
  [menubar addItem:appMenuItem];

  NSString *title = [@"Hide " stringByAppendingString:appName];
  NSMenuItem *item = [[[NSMenuItem alloc] initWithTitle:title
                                                 action:@selector(hide:)
                                          keyEquivalent:@"h"] autorelease];
  [appMenu addItem:item];
  item = [[[NSMenuItem alloc] initWithTitle:@"Hide Others"
                                     action:@selector(hideOtherApplications:)
                              keyEquivalent:@"h"] autorelease];
  [item setKeyEquivalentModifierMask:(NSEventModifierFlagOption |
                                      NSEventModifierFlagCommand)];
  [appMenu addItem:item];
  item = [[[NSMenuItem alloc] initWithTitle:@"Show All"
                                     action:@selector(unhideAllApplications:)
                              keyEquivalent:@""] autorelease];
  [appMenu addItem:item];
  [appMenu addItem:[NSMenuItem separatorItem]];

  title = [@"Quit " stringByAppendingString:appName];
  item = [[[NSMenuItem alloc] initWithTitle:title
                                     action:@selector(terminate:)
                              keyEquivalent:@"q"] autorelease];
  [appMenu addItem:item];

  [NSApp setMainMenu:menubar];

  w->priv.should_exit = 0;
  return 0;
}

int webview_loop(webview_t *w, int blocking) {
  NSDate *until = (blocking ? [NSDate distantFuture] : [NSDate distantPast]);
  NSEvent *event = [NSApp nextEventMatchingMask:NSEventMaskAny
                                      untilDate:until
                                         inMode:NSDefaultRunLoopMode
                                        dequeue:YES];
  if (event) {
    [NSApp sendEvent:event];
  }
  return w->priv.should_exit;
}

int webview_eval(webview_t *w, const char *js) {
  NSString *nsJS = [NSString stringWithUTF8String:js];
  id u = [[w->priv.webview windowScriptObject] evaluateWebScript:nsJS];
  if ([u isKindOfClass:[WebUndefined class]] == YES) {
    return -1;
  }
  return 0;
}

void webview_set_title(webview_t *w, const char *title) {
  NSString *nsTitle = [NSString stringWithUTF8String:title];
  [w->priv.window setTitle:nsTitle];
}

void webview_set_fullscreen(webview_t *w, int fullscreen) {
  int b = ((([w->priv.window styleMask] & NSWindowStyleMaskFullScreen) ==
            NSWindowStyleMaskFullScreen)
               ? 1
               : 0);
  if (b != fullscreen) {
    [w->priv.window toggleFullScreen:nil];
  }
}

void webview_dialog(webview_t *w,
                                webview_dialog_t dlgtype, int flags,
                                const char *title, const char *arg,
                                char *result, size_t resultsz) {
  if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN ||
      dlgtype == WEBVIEW_DIALOG_TYPE_SAVE) {
    NSSavePanel *panel;
    if (dlgtype == WEBVIEW_DIALOG_TYPE_OPEN) {
      NSOpenPanel *openPanel = [NSOpenPanel openPanel];
      if (flags & WEBVIEW_DIALOG_FLAG_DIRECTORY) {
        [openPanel setCanChooseFiles:NO];
        [openPanel setCanChooseDirectories:YES];
      } else {
        [openPanel setCanChooseFiles:YES];
        [openPanel setCanChooseDirectories:NO];
      }
      [openPanel setResolvesAliases:NO];
      [openPanel setAllowsMultipleSelection:NO];
      panel = openPanel;
    } else {
      panel = [NSSavePanel savePanel];
    }
    [panel setCanCreateDirectories:YES];
    [panel setShowsHiddenFiles:YES];
    [panel setExtensionHidden:NO];
    [panel setCanSelectHiddenExtension:NO];
    [panel setTreatsFilePackagesAsDirectories:YES];
    [panel beginSheetModalForWindow:w->priv.window
                  completionHandler:^(NSInteger result) {
                    [NSApp stopModalWithCode:result];
                  }];
    if ([NSApp runModalForWindow:panel] == NSModalResponseOK) {
      const char *filename = [[[panel URL] path] UTF8String];
      strlcpy(result, filename, resultsz);
    }
  } else if (dlgtype == WEBVIEW_DIALOG_TYPE_ALERT) {
    NSAlert *a = [NSAlert new];
    switch (flags & WEBVIEW_DIALOG_FLAG_ALERT_MASK) {
    case WEBVIEW_DIALOG_FLAG_INFO:
      [a setAlertStyle:NSAlertStyleInformational];
      break;
    case WEBVIEW_DIALOG_FLAG_WARNING:
      NSLog(@"warning");
      [a setAlertStyle:NSAlertStyleWarning];
      break;
    case WEBVIEW_DIALOG_FLAG_ERROR:
      NSLog(@"error");
      [a setAlertStyle:NSAlertStyleCritical];
      break;
    }
    [a setShowsHelp:NO];
    [a setShowsSuppressionButton:NO];
    [a setMessageText:[NSString stringWithUTF8String:title]];
    [a setInformativeText:[NSString stringWithUTF8String:arg]];
    [a addButtonWithTitle:@"OK"];
    [a runModal];
    [a release];
  }
}

static void webview_dispatch_cb(void *arg) {
  struct webview_dispatch_arg *context = (struct webview_dispatch_arg *)arg;
  (context->fn)(context->w, context->arg);
  free(context);
}

void webview_dispatch(webview_t *w, webview_dispatch_fn fn,
                                  void *arg) {
  struct webview_dispatch_arg *context = (struct webview_dispatch_arg *)malloc(
      sizeof(struct webview_dispatch_arg));
  context->w = w;
  context->arg = arg;
  context->fn = fn;
  dispatch_async_f(dispatch_get_main_queue(), context, webview_dispatch_cb);
}

void webview_terminate(webview_t *w) {
  w->priv.should_exit = 1;
}
void webview_exit(webview_t *w) { [NSApp terminate:NSApp]; }
void webview_print_log(const char *s) { NSLog(@"%s", s); }

#endif /* WEBVIEW_COCOA */