tauri-workspace/ui/tauri-windows.c

#include "tauri-windows-webview.h"
#include "tauri.h"

#pragma comment(lib, "user32.lib")
#pragma comment(lib, "ole32.lib")
#pragma comment(lib, "oleaut32.lib")

#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 {
  IInternetSecurityManager mgr;
} _IInternetSecurityManagerEx;

typedef struct {
  IServiceProvider provider;
  _IInternetSecurityManagerEx mgr;
} _IServiceProviderEx;

typedef struct {
  IOleClientSite client;
  _IOleInPlaceSiteEx inplace;
  _IDocHostUIHandlerEx ui;
  IDispatch external;
  _IServiceProviderEx provider;
} _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);
  struct webview *w = (struct webview *)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 if (iid_eq(riid, &IID_IServiceProvider)) {
    *ppvObject = &((_IOleClientSiteEx *)This)->provider;
  } 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 HRESULT STDMETHODCALLTYPE IS_QueryInterface(IInternetSecurityManager FAR *This, REFIID riid, void **ppvObject) {
  return E_NOTIMPL;
}
static ULONG STDMETHODCALLTYPE IS_AddRef(IInternetSecurityManager FAR *This) { return 1; }
static ULONG STDMETHODCALLTYPE IS_Release(IInternetSecurityManager FAR *This) { return 1; }
static HRESULT STDMETHODCALLTYPE IS_SetSecuritySite(IInternetSecurityManager FAR *This, IInternetSecurityMgrSite *pSited) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_GetSecuritySite(IInternetSecurityManager FAR *This, IInternetSecurityMgrSite **ppSite) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_MapUrlToZone(IInternetSecurityManager FAR *This, LPCWSTR pwszUrl, DWORD *pdwZone, DWORD dwFlags) {
  *pdwZone = URLZONE_LOCAL_MACHINE;
  return S_OK;
}
static HRESULT STDMETHODCALLTYPE IS_GetSecurityId(IInternetSecurityManager FAR *This, LPCWSTR pwszUrl, BYTE *pbSecurityId, DWORD *pcbSecurityId, DWORD_PTR dwReserved) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_ProcessUrlAction(IInternetSecurityManager FAR *This, LPCWSTR pwszUrl, DWORD dwAction, BYTE *pPolicy,  DWORD cbPolicy, BYTE *pContext, DWORD cbContext, DWORD dwFlags, DWORD dwReserved) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_QueryCustomPolicy(IInternetSecurityManager FAR *This, LPCWSTR pwszUrl, REFGUID guidKey, BYTE **ppPolicy, DWORD *pcbPolicy, BYTE *pContext, DWORD cbContext, DWORD dwReserved) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_SetZoneMapping(IInternetSecurityManager FAR *This, DWORD dwZone, LPCWSTR lpszPattern, DWORD dwFlags) {
  return INET_E_DEFAULT_ACTION;
}
static HRESULT STDMETHODCALLTYPE IS_GetZoneMappings(IInternetSecurityManager FAR *This, DWORD dwZone, IEnumString **ppenumString, DWORD dwFlags) {
  return INET_E_DEFAULT_ACTION;
}
static IInternetSecurityManagerVtbl MyInternetSecurityManagerTable = {IS_QueryInterface, IS_AddRef, IS_Release, IS_SetSecuritySite, IS_GetSecuritySite, IS_MapUrlToZone, IS_GetSecurityId, IS_ProcessUrlAction, IS_QueryCustomPolicy, IS_SetZoneMapping, IS_GetZoneMappings};

static HRESULT STDMETHODCALLTYPE SP_QueryInterface(IServiceProvider FAR *This, REFIID riid, void **ppvObject) {
  return (Site_QueryInterface(
      (IOleClientSite *)((char *)This - sizeof(IOleClientSite) - sizeof(_IOleInPlaceSiteEx) - sizeof(_IDocHostUIHandlerEx) - sizeof(IDispatch)), riid, ppvObject));
}
static ULONG STDMETHODCALLTYPE SP_AddRef(IServiceProvider FAR *This) { return 1; }
static ULONG STDMETHODCALLTYPE SP_Release(IServiceProvider FAR *This) { return 1; }
static HRESULT STDMETHODCALLTYPE SP_QueryService(IServiceProvider FAR *This, REFGUID siid, REFIID riid, void **ppvObject) {
  if (iid_eq(siid, &IID_IInternetSecurityManager) && iid_eq(riid, &IID_IInternetSecurityManager)) {
    *ppvObject = &((_IServiceProviderEx *)This)->mgr;
  } else {
    *ppvObject = 0;
    return (E_NOINTERFACE);
  }
  return S_OK;
}
static IServiceProviderVtbl MyServiceProviderTable = {SP_QueryInterface, SP_AddRef, SP_Release, SP_QueryService};

static void UnEmbedBrowserObject(struct webview *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(struct webview *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;
  _iOleClientSiteEx->provider.provider.lpVtbl = &MyServiceProviderTable;
  _iOleClientSiteEx->provider.mgr.mgr.lpVtbl = &MyInternetSecurityManagerTable;

  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(struct webview *w) {
  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(w->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;
    }

    char *url = (char *)calloc(1, strlen(webview_url) + 1);
    char *q = url;
    for (const char *p = webview_url + strlen(WEBVIEW_DATA_URL_PREFIX); *q = *p;
         p++, q++) {
      if (*q == '%' && *(p + 1) && *(p + 2)) {
        sscanf(p + 1, "%02x", q);
        p = p + 2;
      }
    }

    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) {
  struct webview *w = (struct webview *)GetWindowLongPtr(hwnd, GWLP_USERDATA);
  switch (uMsg) {
  case WM_CREATE:
    w = (struct webview *)((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;
}

WEBVIEW_API int webview_init(struct webview *w) {
  WNDCLASSEX wc;
  HINSTANCE hInstance;
  DWORD style;
  RECT clientRect;
  RECT rect;

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

  hInstance = GetModuleHandle(NULL);
  if (hInstance == NULL) {
    return -1;
  }
  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 (!w->resizable) {
    style = WS_OVERLAPPED | WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU;
  }

  rect.left = 0;
  rect.top = 0;
  rect.right = w->width;
  rect.bottom = w->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, w->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);

  SetWindowText(w->priv.hwnd, w->title);
  ShowWindow(w->priv.hwnd, SW_SHOWDEFAULT);
  UpdateWindow(w->priv.hwnd);
  SetFocus(w->priv.hwnd);

  return 0;
}

WEBVIEW_API int webview_loop(struct webview *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;
}

WEBVIEW_API int webview_eval(struct webview *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;
}

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

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

WEBVIEW_API void webview_set_fullscreen(struct webview *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);
  }
}

WEBVIEW_API void webview_set_color(struct webview *w, uint8_t r, uint8_t g,
                                   uint8_t b, uint8_t a) {
  HBRUSH brush = CreateSolidBrush(RGB(r, g, b));
  SetClassLongPtr(w->priv.hwnd, GCLP_HBRBACKGROUND, (LONG_PTR)brush);
}

/* 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

WEBVIEW_API void webview_dialog(struct webview *w,
                                enum webview_dialog_type 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 = 0, 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
  }
}

WEBVIEW_API void webview_terminate(struct webview *w) { PostQuitMessage(0); }

WEBVIEW_API void webview_exit(struct webview *w) {
  DestroyWindow(w->priv.hwnd);
  OleUninitialize();
}

WEBVIEW_API void webview_print_log(const char *s) { OutputDebugString(s); }