/*
 * Copyright 2015 Zhenbo Li
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include <stdarg.h>
#include <assert.h>

#define COBJMACROS

#include "windef.h"
#include "winbase.h"
#include "winuser.h"
#include "ole2.h"

#include "wine/debug.h"

#include "mshtml_private.h"
#include "htmlevent.h"
#include "mshtmdid.h"
#include "initguid.h"
#include "msxml6.h"
#include "objsafe.h"

WINE_DEFAULT_DEBUG_CHANNEL(mshtml);

#define MSHTML_DISPID_HTMLXMLHTTPREQUEST_ONLOAD MSHTML_DISPID_CUSTOM_MIN

static HRESULT bstr_to_nsacstr(BSTR bstr, nsACString *str)
{
    char *cstr = heap_strdupWtoU(bstr);
    if(!cstr)
        return E_OUTOFMEMORY;
    nsACString_Init(str, cstr);
    heap_free(cstr);
    return S_OK;
}

static HRESULT variant_to_nsastr(VARIANT var, nsAString *ret)
{
    switch(V_VT(&var)) {
        case VT_NULL:
        case VT_ERROR:
        case VT_EMPTY:
            nsAString_Init(ret, NULL);
            return S_OK;
        case VT_BSTR:
            nsAString_InitDepend(ret, V_BSTR(&var));
            return S_OK;
        default:
            FIXME("Unsupported VARIANT: %s\n", debugstr_variant(&var));
            return E_INVALIDARG;
    }
}

static HRESULT return_nscstr(nsresult nsres, nsACString *nscstr, BSTR *p)
{
    const char *str;
    int len;

    if(NS_FAILED(nsres)) {
        ERR("failed: %08x\n", nsres);
        nsACString_Finish(nscstr);
        return E_FAIL;
    }

    nsACString_GetData(nscstr, &str);

    if(*str) {
        len = MultiByteToWideChar(CP_UTF8, 0, str, -1, NULL, 0);
        *p = SysAllocStringLen(NULL, len - 1);
        if(!*p) {
            nsACString_Finish(nscstr);
            return E_OUTOFMEMORY;
        }
        MultiByteToWideChar(CP_UTF8, 0, str, -1, *p, len);
    }else {
        *p = NULL;
    }

    nsACString_Finish(nscstr);
    return S_OK;
}

typedef struct {
    nsIDOMEventListener nsIDOMEventListener_iface;
    LONG ref;
    HTMLXMLHttpRequest *xhr;
    BOOL readystatechange_event;
    BOOL load_event;
} XMLHttpReqEventListener;

struct HTMLXMLHttpRequest {
    EventTarget event_target;
    IHTMLXMLHttpRequest IHTMLXMLHttpRequest_iface;
    IProvideClassInfo2 IProvideClassInfo2_iface;
    LONG ref;
    nsIXMLHttpRequest *nsxhr;
    XMLHttpReqEventListener *event_listener;
};

static void detach_xhr_event_listener(XMLHttpReqEventListener *event_listener)
{
    nsIDOMEventTarget *event_target;
    nsAString str;
    nsresult nsres;

    nsres = nsIXMLHttpRequest_QueryInterface(event_listener->xhr->nsxhr, &IID_nsIDOMEventTarget, (void**)&event_target);
    assert(nsres == NS_OK);

    if(event_listener->readystatechange_event) {
        nsAString_InitDepend(&str, L"onreadystatechange");
        nsres = nsIDOMEventTarget_RemoveEventListener(event_target, &str, &event_listener->nsIDOMEventListener_iface, FALSE);
        nsAString_Finish(&str);
        assert(nsres == NS_OK);
    }

    if(event_listener->load_event) {
        nsAString_InitDepend(&str, L"load");
        nsres = nsIDOMEventTarget_RemoveEventListener(event_target, &str, &event_listener->nsIDOMEventListener_iface, FALSE);
        nsAString_Finish(&str);
        assert(nsres == NS_OK);
    }

    nsIDOMEventTarget_Release(event_target);

    event_listener->xhr->event_listener = NULL;
    event_listener->xhr = NULL;
    nsIDOMEventListener_Release(&event_listener->nsIDOMEventListener_iface);
}


static inline XMLHttpReqEventListener *impl_from_nsIDOMEventListener(nsIDOMEventListener *iface)
{
    return CONTAINING_RECORD(iface, XMLHttpReqEventListener, nsIDOMEventListener_iface);
}

static nsresult NSAPI XMLHttpReqEventListener_QueryInterface(nsIDOMEventListener *iface,
        nsIIDRef riid, void **result)
{
    XMLHttpReqEventListener *This = impl_from_nsIDOMEventListener(iface);

    if(IsEqualGUID(&IID_nsISupports, riid)) {
        TRACE("(%p)->(IID_nsISupports, %p)\n", This, result);
        *result = &This->nsIDOMEventListener_iface;
    }else if(IsEqualGUID(&IID_nsIDOMEventListener, riid)) {
        TRACE("(%p)->(IID_nsIDOMEventListener %p)\n", This, result);
        *result = &This->nsIDOMEventListener_iface;
    }else {
        *result = NULL;
        TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), result);
        return NS_NOINTERFACE;
    }

    nsIDOMEventListener_AddRef(&This->nsIDOMEventListener_iface);
    return NS_OK;
}

static nsrefcnt NSAPI XMLHttpReqEventListener_AddRef(nsIDOMEventListener *iface)
{
    XMLHttpReqEventListener *This = impl_from_nsIDOMEventListener(iface);
    LONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    return ref;
}

static nsrefcnt NSAPI XMLHttpReqEventListener_Release(nsIDOMEventListener *iface)
{
    XMLHttpReqEventListener *This = impl_from_nsIDOMEventListener(iface);
    LONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    if(!ref) {
        assert(!This->xhr);
        heap_free(This);
    }

    return ref;
}

static nsresult NSAPI XMLHttpReqEventListener_HandleEvent(nsIDOMEventListener *iface, nsIDOMEvent *nsevent)
{
    XMLHttpReqEventListener *This = impl_from_nsIDOMEventListener(iface);
    DOMEvent *event;
    HRESULT hres;

    TRACE("(%p)\n", This);

    if(!This->xhr)
        return NS_OK;

    hres = create_event_from_nsevent(nsevent, &event);
    if(SUCCEEDED(hres) ){
        dispatch_event(&This->xhr->event_target, event);
        IDOMEvent_Release(&event->IDOMEvent_iface);
    }
    return NS_OK;
}

static const nsIDOMEventListenerVtbl XMLHttpReqEventListenerVtbl = {
    XMLHttpReqEventListener_QueryInterface,
    XMLHttpReqEventListener_AddRef,
    XMLHttpReqEventListener_Release,
    XMLHttpReqEventListener_HandleEvent
};

static inline HTMLXMLHttpRequest *impl_from_IHTMLXMLHttpRequest(IHTMLXMLHttpRequest *iface)
{
    return CONTAINING_RECORD(iface, HTMLXMLHttpRequest, IHTMLXMLHttpRequest_iface);
}

static HRESULT WINAPI HTMLXMLHttpRequest_QueryInterface(IHTMLXMLHttpRequest *iface, REFIID riid, void **ppv)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    TRACE("(%p)->(%s %p)\n", This, debugstr_mshtml_guid(riid), ppv);

    if(IsEqualGUID(&IID_IUnknown, riid)) {
        *ppv = &This->IHTMLXMLHttpRequest_iface;
    }else if(IsEqualGUID(&IID_IDispatch, riid)) {
        *ppv = &This->IHTMLXMLHttpRequest_iface;
    }else if(IsEqualGUID(&IID_IHTMLXMLHttpRequest, riid)) {
        *ppv = &This->IHTMLXMLHttpRequest_iface;
    }else if(IsEqualGUID(&IID_IProvideClassInfo, riid)) {
        *ppv = &This->IProvideClassInfo2_iface;
    }else if(IsEqualGUID(&IID_IProvideClassInfo2, riid)) {
        *ppv = &This->IProvideClassInfo2_iface;
    }else {
        return EventTarget_QI(&This->event_target, riid, ppv);
    }

    IUnknown_AddRef((IUnknown*)*ppv);
    return S_OK;
}

static ULONG WINAPI HTMLXMLHttpRequest_AddRef(IHTMLXMLHttpRequest *iface)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    LONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    return ref;
}

static ULONG WINAPI HTMLXMLHttpRequest_Release(IHTMLXMLHttpRequest *iface)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    LONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    if(!ref) {
        if(This->event_listener)
            detach_xhr_event_listener(This->event_listener);
        release_event_target(&This->event_target);
        release_dispex(&This->event_target.dispex);
        nsIXMLHttpRequest_Release(This->nsxhr);
        heap_free(This);
    }

    return ref;
}

static HRESULT WINAPI HTMLXMLHttpRequest_GetTypeInfoCount(IHTMLXMLHttpRequest *iface, UINT *pctinfo)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    return IDispatchEx_GetTypeInfoCount(&This->event_target.dispex.IDispatchEx_iface, pctinfo);
}

static HRESULT WINAPI HTMLXMLHttpRequest_GetTypeInfo(IHTMLXMLHttpRequest *iface, UINT iTInfo,
        LCID lcid, ITypeInfo **ppTInfo)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    return IDispatchEx_GetTypeInfo(&This->event_target.dispex.IDispatchEx_iface, iTInfo, lcid, ppTInfo);
}

static HRESULT WINAPI HTMLXMLHttpRequest_GetIDsOfNames(IHTMLXMLHttpRequest *iface, REFIID riid, LPOLESTR *rgszNames, UINT cNames,
        LCID lcid, DISPID *rgDispId)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    return IDispatchEx_GetIDsOfNames(&This->event_target.dispex.IDispatchEx_iface, riid, rgszNames, cNames,
            lcid, rgDispId);
}

static HRESULT WINAPI HTMLXMLHttpRequest_Invoke(IHTMLXMLHttpRequest *iface, DISPID dispIdMember, REFIID riid, LCID lcid,
        WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    return IDispatchEx_Invoke(&This->event_target.dispex.IDispatchEx_iface, dispIdMember, riid, lcid, wFlags,
            pDispParams, pVarResult, pExcepInfo, puArgErr);
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_readyState(IHTMLXMLHttpRequest *iface, LONG *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    UINT16 val;
    nsresult nsres;

    TRACE("(%p)->(%p)\n", This, p);

    if(!p)
        return E_POINTER;
    nsres = nsIXMLHttpRequest_GetReadyState(This->nsxhr, &val);
    if(NS_FAILED(nsres)) {
        ERR("nsIXMLHttpRequest_GetReadyState failed: %08x\n", nsres);
        return E_FAIL;
    }
    *p = val;
    return S_OK;
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_responseBody(IHTMLXMLHttpRequest *iface, VARIANT *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    FIXME("(%p)->(%p)\n", This, p);
    return E_NOTIMPL;
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_responseText(IHTMLXMLHttpRequest *iface, BSTR *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsAString nsstr;
    nsresult nsres;

    TRACE("(%p)->(%p)\n", This, p);

    if(!p)
        return E_POINTER;

    nsAString_Init(&nsstr, NULL);
    nsres = nsIXMLHttpRequest_GetResponseText(This->nsxhr, &nsstr);
    return return_nsstr(nsres, &nsstr, p);
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_responseXML(IHTMLXMLHttpRequest *iface, IDispatch **p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    IXMLDOMDocument *xmldoc = NULL;
    BSTR str;
    HRESULT hres;
    VARIANT_BOOL vbool;
    IObjectSafety *safety;

    TRACE("(%p)->(%p)\n", This, p);

    hres = CoCreateInstance(&CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER, &IID_IXMLDOMDocument, (void**)&xmldoc);
    if(FAILED(hres)) {
        ERR("CoCreateInstance failed: %08x\n", hres);
        return hres;
    }

    hres = IHTMLXMLHttpRequest_get_responseText(iface, &str);
    if(FAILED(hres)) {
        IXMLDOMDocument_Release(xmldoc);
        ERR("get_responseText failed: %08x\n", hres);
        return hres;
    }

    hres = IXMLDOMDocument_loadXML(xmldoc, str, &vbool);
    SysFreeString(str);
    if(hres != S_OK || vbool != VARIANT_TRUE)
        WARN("loadXML failed: %08x, returning an empty xmldoc\n", hres);

    hres = IXMLDOMDocument_QueryInterface(xmldoc, &IID_IObjectSafety, (void**)&safety);
    assert(SUCCEEDED(hres));
    hres = IObjectSafety_SetInterfaceSafetyOptions(safety, NULL,
        INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACE_USES_SECURITY_MANAGER,
        INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA | INTERFACE_USES_SECURITY_MANAGER);
    assert(SUCCEEDED(hres));
    IObjectSafety_Release(safety);

    *p = (IDispatch*)xmldoc;
    return S_OK;
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_status(IHTMLXMLHttpRequest *iface, LONG *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    DWORD val;
    nsresult nsres;
    TRACE("(%p)->(%p)\n", This, p);

    if(!p)
        return E_POINTER;

    nsres = nsIXMLHttpRequest_GetStatus(This->nsxhr, &val);
    if(NS_FAILED(nsres)) {
        ERR("nsIXMLHttpRequest_GetStatus failed: %08x\n", nsres);
        return E_FAIL;
    }
    *p = val;
    if(val == 0)
        return E_FAIL; /* WinAPI thinks this is an error */

    return S_OK;
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_statusText(IHTMLXMLHttpRequest *iface, BSTR *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsACString nscstr;
    nsresult nsres;
    HRESULT hres;
    LONG state;

    TRACE("(%p)->(%p)\n", This, p);

    if(!p)
        return E_POINTER;

    hres = IHTMLXMLHttpRequest_get_readyState(iface, &state);
    if(FAILED(hres))
        return hres;

    if(state < 2) {
        *p = NULL;
        return E_FAIL;
    }

    nsACString_Init(&nscstr, NULL);
    nsres = nsIXMLHttpRequest_GetStatusText(This->nsxhr, &nscstr);
    return return_nscstr(nsres, &nscstr, p);
}

static HRESULT WINAPI HTMLXMLHttpRequest_put_onreadystatechange(IHTMLXMLHttpRequest *iface, VARIANT v)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    TRACE("(%p)->(%s)\n", This, debugstr_variant(&v));

    return set_event_handler(&This->event_target, EVENTID_READYSTATECHANGE, &v);
}

static HRESULT WINAPI HTMLXMLHttpRequest_get_onreadystatechange(IHTMLXMLHttpRequest *iface, VARIANT *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);

    TRACE("(%p)->(%p)\n", This, p);

    return get_event_handler(&This->event_target, EVENTID_READYSTATECHANGE, p);
}

static HRESULT WINAPI HTMLXMLHttpRequest_abort(IHTMLXMLHttpRequest *iface)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsresult nsres;

    TRACE("(%p)->()\n", This);

    nsres = nsIXMLHttpRequest_SlowAbort(This->nsxhr);
    if(NS_FAILED(nsres)) {
        ERR("nsIXMLHttpRequest_SlowAbort failed: %08x\n", nsres);
        return E_FAIL;
    }

    return S_OK;
}

static HRESULT HTMLXMLHttpRequest_open_hook(DispatchEx *dispex, LCID lcid, WORD flags,
        DISPPARAMS *dp, VARIANT *res, EXCEPINFO *ei, IServiceProvider *caller)
{
    /* If only two arguments were given, implicitly set async to false */
    if((flags & DISPATCH_METHOD) && dp->cArgs == 2 && !dp->cNamedArgs) {
        VARIANT args[5];
        DISPPARAMS new_dp = {args, NULL, ARRAY_SIZE(args), 0};
        V_VT(args) = VT_EMPTY;
        V_VT(args+1) = VT_EMPTY;
        V_VT(args+2) = VT_BOOL;
        V_BOOL(args+2) = VARIANT_TRUE;
        args[3] = dp->rgvarg[0];
        args[4] = dp->rgvarg[1];

        TRACE("implicit async\n");

        return IDispatchEx_InvokeEx(&dispex->IDispatchEx_iface, DISPID_IHTMLXMLHTTPREQUEST_OPEN,
                                    lcid, flags, &new_dp, res, ei, caller);
    }

    return S_FALSE; /* fallback to default */
}

static HRESULT WINAPI HTMLXMLHttpRequest_open(IHTMLXMLHttpRequest *iface, BSTR bstrMethod, BSTR bstrUrl, VARIANT varAsync, VARIANT varUser, VARIANT varPassword)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsACString method, url;
    nsAString user, password;
    nsresult nsres;
    HRESULT hres;

    TRACE("(%p)->(%s %s %s %s %s)\n", This, debugstr_w(bstrMethod), debugstr_w(bstrUrl), debugstr_variant(&varAsync), debugstr_variant(&varUser), debugstr_variant(&varPassword));

    if(V_VT(&varAsync) != VT_BOOL) {
        FIXME("varAsync not supported: %s\n", debugstr_variant(&varAsync));
        return E_FAIL;
    }

    /* Note: Starting with Gecko 30.0 (Firefox 30.0 / Thunderbird 30.0 / SeaMonkey 2.27),
     * synchronous requests on the main thread have been deprecated due to the negative
     * effects to the user experience.
     */
    if(!V_BOOL(&varAsync)) {
        FIXME("Synchronous request is not supported yet\n");
        return E_FAIL;
    }

    hres = variant_to_nsastr(varUser, &user);
    if(FAILED(hres))
        return hres;
    hres = variant_to_nsastr(varPassword, &password);
    if(FAILED(hres)) {
        nsAString_Finish(&user);
        return hres;
    }

    hres = bstr_to_nsacstr(bstrMethod, &method);
    if(FAILED(hres)) {
        nsAString_Finish(&user);
        nsAString_Finish(&password);
        return hres;
    }
    hres = bstr_to_nsacstr(bstrUrl, &url);
    if(FAILED(hres)) {
        nsAString_Finish(&user);
        nsAString_Finish(&password);
        nsACString_Finish(&method);
        return hres;
    }

    nsres = nsIXMLHttpRequest_Open(This->nsxhr, &method, &url, TRUE,
            &user, &password, 0);

    nsACString_Finish(&method);
    nsACString_Finish(&url);
    nsAString_Finish(&user);
    nsAString_Finish(&password);

    if(NS_FAILED(nsres)) {
        ERR("nsIXMLHttpRequest_Open failed: %08x\n", nsres);
        return E_FAIL;
    }

    return S_OK;
}

static HRESULT WINAPI HTMLXMLHttpRequest_send(IHTMLXMLHttpRequest *iface, VARIANT varBody)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsIWritableVariant *nsbody = NULL;
    nsresult nsres = NS_OK;

    TRACE("(%p)->(%s)\n", This, debugstr_variant(&varBody));

    switch(V_VT(&varBody)) {
    case VT_NULL:
    case VT_EMPTY:
    case VT_ERROR:
        break;
    case VT_BSTR: {
        nsAString nsstr;

        nsbody = create_nsvariant();
        if(!nsbody)
            return E_OUTOFMEMORY;

        nsAString_InitDepend(&nsstr, V_BSTR(&varBody));
        nsres = nsIWritableVariant_SetAsAString(nsbody, &nsstr);
        nsAString_Finish(&nsstr);
        break;
    }
    default:
        FIXME("unsupported body type %s\n", debugstr_variant(&varBody));
        return E_NOTIMPL;
    }

    if(NS_SUCCEEDED(nsres))
        nsres = nsIXMLHttpRequest_Send(This->nsxhr, (nsIVariant*)nsbody);
    if(nsbody)
        nsIWritableVariant_Release(nsbody);
    if(NS_FAILED(nsres)) {
        ERR("nsIXMLHttpRequest_Send failed: %08x\n", nsres);
        return E_FAIL;
    }

    return S_OK;
}

static HRESULT WINAPI HTMLXMLHttpRequest_getAllResponseHeaders(IHTMLXMLHttpRequest *iface, BSTR *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsACString nscstr;
    nsresult nsres;
    HRESULT hres;
    LONG state;

    TRACE("(%p)->(%p)\n", This, p);

    if(!p)
        return E_POINTER;

    hres = IHTMLXMLHttpRequest_get_readyState(iface, &state);
    if(FAILED(hres))
        return hres;

    if(state < 2) {
        *p = NULL;
        return E_FAIL;
    }

    nsACString_Init(&nscstr, NULL);
    nsres = nsIXMLHttpRequest_GetAllResponseHeaders(This->nsxhr, &nscstr);
    return return_nscstr(nsres, &nscstr, p);
}

static HRESULT WINAPI HTMLXMLHttpRequest_getResponseHeader(IHTMLXMLHttpRequest *iface, BSTR bstrHeader, BSTR *p)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    nsACString header, ret;
    char *cstr;
    nsresult nsres;
    HRESULT hres;
    LONG state;
    TRACE("(%p)->(%s %p)\n", This, debugstr_w(bstrHeader), p);

    if(!p)
        return E_POINTER;
    if(!bstrHeader)
        return E_INVALIDARG;

    hres = IHTMLXMLHttpRequest_get_readyState(iface, &state);
    if(FAILED(hres))
        return hres;

    if(state < 2) {
        *p = NULL;
        return E_FAIL;
    }

    cstr = heap_strdupWtoU(bstrHeader);
    nsACString_InitDepend(&header, cstr);
    nsACString_Init(&ret, NULL);

    nsres = nsIXMLHttpRequest_GetResponseHeader(This->nsxhr, &header, &ret);

    nsACString_Finish(&header);
    heap_free(cstr);
    return return_nscstr(nsres, &ret, p);
}

static HRESULT WINAPI HTMLXMLHttpRequest_setRequestHeader(IHTMLXMLHttpRequest *iface, BSTR bstrHeader, BSTR bstrValue)
{
    HTMLXMLHttpRequest *This = impl_from_IHTMLXMLHttpRequest(iface);
    char *header_u, *value_u;
    nsACString header, value;
    nsresult nsres;

    TRACE("(%p)->(%s %s)\n", This, debugstr_w(bstrHeader), debugstr_w(bstrValue));

    header_u = heap_strdupWtoU(bstrHeader);
    if(bstrHeader && !header_u)
        return E_OUTOFMEMORY;

    value_u = heap_strdupWtoU(bstrValue);
    if(bstrValue && !value_u) {
        heap_free(header_u);
        return E_OUTOFMEMORY;
    }

    nsACString_InitDepend(&header, header_u);
    nsACString_InitDepend(&value, value_u);
    nsres = nsIXMLHttpRequest_SetRequestHeader(This->nsxhr, &header, &value);
    nsACString_Finish(&header);
    nsACString_Finish(&value);
    heap_free(header_u);
    heap_free(value_u);
    if(NS_FAILED(nsres)) {
        ERR("SetRequestHeader failed: %08x\n", nsres);
        return E_FAIL;
    }

    return S_OK;
}

static const IHTMLXMLHttpRequestVtbl HTMLXMLHttpRequestVtbl = {
    HTMLXMLHttpRequest_QueryInterface,
    HTMLXMLHttpRequest_AddRef,
    HTMLXMLHttpRequest_Release,
    HTMLXMLHttpRequest_GetTypeInfoCount,
    HTMLXMLHttpRequest_GetTypeInfo,
    HTMLXMLHttpRequest_GetIDsOfNames,
    HTMLXMLHttpRequest_Invoke,
    HTMLXMLHttpRequest_get_readyState,
    HTMLXMLHttpRequest_get_responseBody,
    HTMLXMLHttpRequest_get_responseText,
    HTMLXMLHttpRequest_get_responseXML,
    HTMLXMLHttpRequest_get_status,
    HTMLXMLHttpRequest_get_statusText,
    HTMLXMLHttpRequest_put_onreadystatechange,
    HTMLXMLHttpRequest_get_onreadystatechange,
    HTMLXMLHttpRequest_abort,
    HTMLXMLHttpRequest_open,
    HTMLXMLHttpRequest_send,
    HTMLXMLHttpRequest_getAllResponseHeaders,
    HTMLXMLHttpRequest_getResponseHeader,
    HTMLXMLHttpRequest_setRequestHeader
};

static inline HTMLXMLHttpRequest *impl_from_IProvideClassInfo2(IProvideClassInfo2 *iface)
{
    return CONTAINING_RECORD(iface, HTMLXMLHttpRequest, IProvideClassInfo2_iface);
}

static HRESULT WINAPI ProvideClassInfo_QueryInterface(IProvideClassInfo2 *iface, REFIID riid, void **ppv)
{
    HTMLXMLHttpRequest *This = impl_from_IProvideClassInfo2(iface);
    return IHTMLXMLHttpRequest_QueryInterface(&This->IHTMLXMLHttpRequest_iface, riid, ppv);
}

static ULONG WINAPI ProvideClassInfo_AddRef(IProvideClassInfo2 *iface)
{
    HTMLXMLHttpRequest *This = impl_from_IProvideClassInfo2(iface);
    return IHTMLXMLHttpRequest_AddRef(&This->IHTMLXMLHttpRequest_iface);
}

static ULONG WINAPI ProvideClassInfo_Release(IProvideClassInfo2 *iface)
{
    HTMLXMLHttpRequest *This = impl_from_IProvideClassInfo2(iface);
    return IHTMLXMLHttpRequest_Release(&This->IHTMLXMLHttpRequest_iface);
}

static HRESULT WINAPI ProvideClassInfo_GetClassInfo(IProvideClassInfo2 *iface, ITypeInfo **ppTI)
{
    HTMLXMLHttpRequest *This = impl_from_IProvideClassInfo2(iface);
    TRACE("(%p)->(%p)\n", This, ppTI);
    return get_class_typeinfo(&CLSID_HTMLXMLHttpRequest, ppTI);
}

static HRESULT WINAPI ProvideClassInfo2_GetGUID(IProvideClassInfo2 *iface, DWORD dwGuidKind, GUID *pGUID)
{
    HTMLXMLHttpRequest *This = impl_from_IProvideClassInfo2(iface);
    FIXME("(%p)->(%u %p)\n", This, dwGuidKind, pGUID);
    return E_NOTIMPL;
}

static const IProvideClassInfo2Vtbl ProvideClassInfo2Vtbl = {
    ProvideClassInfo_QueryInterface,
    ProvideClassInfo_AddRef,
    ProvideClassInfo_Release,
    ProvideClassInfo_GetClassInfo,
    ProvideClassInfo2_GetGUID,
};

static inline HTMLXMLHttpRequest *impl_from_DispatchEx(DispatchEx *iface)
{
    return CONTAINING_RECORD(iface, HTMLXMLHttpRequest, event_target.dispex);
}

static HRESULT HTMLXMLHttpRequest_get_dispid(DispatchEx *dispex, BSTR name, DWORD flags, DISPID *dispid)
{
    /* onload event handler property is supported, but not exposed by any interface. We implement as a custom property. */
    if(!wcscmp(L"onload", name)) {
        *dispid = MSHTML_DISPID_HTMLXMLHTTPREQUEST_ONLOAD;
        return S_OK;
    }

    return DISP_E_UNKNOWNNAME;
}

static HRESULT HTMLXMLHttpRequest_invoke(DispatchEx *dispex, DISPID id, LCID lcid, WORD flags, DISPPARAMS *params,
        VARIANT *res, EXCEPINFO *ei, IServiceProvider *caller)
{
    HTMLXMLHttpRequest *This = impl_from_DispatchEx(dispex);

    if(id == MSHTML_DISPID_HTMLXMLHTTPREQUEST_ONLOAD) {
        switch(flags) {
        case DISPATCH_PROPERTYGET:
            TRACE("(%p) get onload\n", This);
            return get_event_handler(&This->event_target, EVENTID_LOAD, res);

        case DISPATCH_PROPERTYPUT:
            if(params->cArgs != 1 || (params->cNamedArgs == 1 && *params->rgdispidNamedArgs != DISPID_PROPERTYPUT)
               || params->cNamedArgs > 1) {
                FIXME("invalid args\n");
                return E_INVALIDARG;
            }

            TRACE("(%p)->(%p) set onload\n", This, params->rgvarg);
            return set_event_handler(&This->event_target, EVENTID_LOAD, params->rgvarg);

        default:
            FIXME("Unimplemented flags %x\n", flags);
            return E_NOTIMPL;
        }
    }

    return DISP_E_UNKNOWNNAME;
}

static nsISupports *HTMLXMLHttpRequest_get_gecko_target(DispatchEx *dispex)
{
    HTMLXMLHttpRequest *This = impl_from_DispatchEx(dispex);
    return (nsISupports*)This->nsxhr;
}

static void HTMLXMLHttpRequest_bind_event(DispatchEx *dispex, eventid_t eid)
{
    HTMLXMLHttpRequest *This = impl_from_DispatchEx(dispex);
    nsIDOMEventTarget *nstarget;
    const WCHAR *type_name;
    nsAString type_str;
    nsresult nsres;

    TRACE("(%p)\n", This);

    switch(eid) {
    case EVENTID_READYSTATECHANGE:
        type_name = L"readystatechange";
        break;
    case EVENTID_LOAD:
        type_name = L"load";
        break;
    default:
        return;
    }

    if(!This->event_listener) {
        This->event_listener = heap_alloc(sizeof(*This->event_listener));
        if(!This->event_listener)
            return;

        This->event_listener->nsIDOMEventListener_iface.lpVtbl = &XMLHttpReqEventListenerVtbl;
        This->event_listener->ref = 1;
        This->event_listener->xhr = This;
        This->event_listener->readystatechange_event = FALSE;
        This->event_listener->load_event = FALSE;
    }

    nsres = nsIXMLHttpRequest_QueryInterface(This->nsxhr, &IID_nsIDOMEventTarget, (void**)&nstarget);
    assert(nsres == NS_OK);

    nsAString_InitDepend(&type_str, type_name);
    nsres = nsIDOMEventTarget_AddEventListener(nstarget, &type_str, &This->event_listener->nsIDOMEventListener_iface, FALSE, TRUE, 2);
    nsAString_Finish(&type_str);
    if(NS_FAILED(nsres))
        ERR("AddEventListener(%s) failed: %08x\n", debugstr_w(type_name), nsres);

    nsIDOMEventTarget_Release(nstarget);

    if(eid == EVENTID_READYSTATECHANGE)
        This->event_listener->readystatechange_event = TRUE;
    else
        This->event_listener->load_event = TRUE;
}

static void HTMLXMLHttpRequest_init_dispex_info(dispex_data_t *info, compat_mode_t compat_mode)
{
    static const dispex_hook_t xhr_hooks[] = {
        {DISPID_IHTMLXMLHTTPREQUEST_OPEN, HTMLXMLHttpRequest_open_hook},
        {DISPID_UNKNOWN}
    };

    EventTarget_init_dispex_info(info, compat_mode);
    dispex_info_add_interface(info, IHTMLXMLHttpRequest_tid, compat_mode >= COMPAT_MODE_IE10 ? xhr_hooks : NULL);
}

static event_target_vtbl_t HTMLXMLHttpRequest_event_target_vtbl = {
    {
        NULL,
        HTMLXMLHttpRequest_get_dispid,
        HTMLXMLHttpRequest_invoke
    },
    HTMLXMLHttpRequest_get_gecko_target,
    HTMLXMLHttpRequest_bind_event
};

static const tid_t HTMLXMLHttpRequest_iface_tids[] = {
    0
};
static dispex_static_data_t HTMLXMLHttpRequest_dispex = {
    &HTMLXMLHttpRequest_event_target_vtbl.dispex_vtbl,
    DispHTMLXMLHttpRequest_tid,
    HTMLXMLHttpRequest_iface_tids,
    HTMLXMLHttpRequest_init_dispex_info
};


/* IHTMLXMLHttpRequestFactory */
static inline HTMLXMLHttpRequestFactory *impl_from_IHTMLXMLHttpRequestFactory(IHTMLXMLHttpRequestFactory *iface)
{
    return CONTAINING_RECORD(iface, HTMLXMLHttpRequestFactory, IHTMLXMLHttpRequestFactory_iface);
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_QueryInterface(IHTMLXMLHttpRequestFactory *iface, REFIID riid, void **ppv)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);

    TRACE("(%p)->(%s %p)\n", This, debugstr_mshtml_guid(riid), ppv);

    if(IsEqualGUID(&IID_IUnknown, riid)) {
        *ppv = &This->IHTMLXMLHttpRequestFactory_iface;
    }else if(IsEqualGUID(&IID_IDispatch, riid)) {
        *ppv = &This->IHTMLXMLHttpRequestFactory_iface;
    }else if(IsEqualGUID(&IID_IHTMLXMLHttpRequestFactory, riid)) {
        *ppv = &This->IHTMLXMLHttpRequestFactory_iface;
    }else if(dispex_query_interface(&This->dispex, riid, ppv)) {
        return *ppv ? S_OK : E_NOINTERFACE;
    }else {
        *ppv = NULL;
        WARN("(%p)->(%s %p)\n", This, debugstr_mshtml_guid(riid), ppv);
        return E_NOINTERFACE;
    }

    IUnknown_AddRef((IUnknown*)*ppv);
    return S_OK;
}

static ULONG WINAPI HTMLXMLHttpRequestFactory_AddRef(IHTMLXMLHttpRequestFactory *iface)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);
    LONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    return ref;
}

static ULONG WINAPI HTMLXMLHttpRequestFactory_Release(IHTMLXMLHttpRequestFactory *iface)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);
    LONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p) ref=%d\n", This, ref);

    if(!ref) {
        release_dispex(&This->dispex);
        heap_free(This);
    }

    return ref;
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_GetTypeInfoCount(IHTMLXMLHttpRequestFactory *iface, UINT *pctinfo)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);
    return IDispatchEx_GetTypeInfoCount(&This->dispex.IDispatchEx_iface, pctinfo);
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_GetTypeInfo(IHTMLXMLHttpRequestFactory *iface, UINT iTInfo,
        LCID lcid, ITypeInfo **ppTInfo)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);

    return IDispatchEx_GetTypeInfo(&This->dispex.IDispatchEx_iface, iTInfo, lcid, ppTInfo);
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_GetIDsOfNames(IHTMLXMLHttpRequestFactory *iface, REFIID riid, LPOLESTR *rgszNames, UINT cNames,
        LCID lcid, DISPID *rgDispId)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);

    return IDispatchEx_GetIDsOfNames(&This->dispex.IDispatchEx_iface, riid, rgszNames, cNames,
            lcid, rgDispId);
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_Invoke(IHTMLXMLHttpRequestFactory *iface, DISPID dispIdMember, REFIID riid, LCID lcid,
        WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);

    return IDispatchEx_Invoke(&This->dispex.IDispatchEx_iface, dispIdMember, riid, lcid, wFlags,
            pDispParams, pVarResult, pExcepInfo, puArgErr);
}

static HRESULT WINAPI HTMLXMLHttpRequestFactory_create(IHTMLXMLHttpRequestFactory *iface, IHTMLXMLHttpRequest **p)
{
    HTMLXMLHttpRequestFactory *This = impl_from_IHTMLXMLHttpRequestFactory(iface);
    HTMLXMLHttpRequest        *ret;
    nsIXMLHttpRequest         *nsxhr;

    TRACE("(%p)->(%p)\n", This, p);

    nsxhr = create_nsxhr(This->window->base.outer_window->nswindow);
    if(!nsxhr)
        return E_FAIL;

    ret = heap_alloc_zero(sizeof(*ret));
    if(!ret) {
        nsIXMLHttpRequest_Release(nsxhr);
        return E_OUTOFMEMORY;
    }
    ret->nsxhr = nsxhr;

    ret->IHTMLXMLHttpRequest_iface.lpVtbl = &HTMLXMLHttpRequestVtbl;
    ret->IProvideClassInfo2_iface.lpVtbl = &ProvideClassInfo2Vtbl;
    EventTarget_Init(&ret->event_target, (IUnknown*)&ret->IHTMLXMLHttpRequest_iface,
                     &HTMLXMLHttpRequest_dispex, This->window->doc->document_mode);
    ret->ref = 1;

    *p = &ret->IHTMLXMLHttpRequest_iface;
    return S_OK;
}

static const IHTMLXMLHttpRequestFactoryVtbl HTMLXMLHttpRequestFactoryVtbl = {
    HTMLXMLHttpRequestFactory_QueryInterface,
    HTMLXMLHttpRequestFactory_AddRef,
    HTMLXMLHttpRequestFactory_Release,
    HTMLXMLHttpRequestFactory_GetTypeInfoCount,
    HTMLXMLHttpRequestFactory_GetTypeInfo,
    HTMLXMLHttpRequestFactory_GetIDsOfNames,
    HTMLXMLHttpRequestFactory_Invoke,
    HTMLXMLHttpRequestFactory_create
};

static inline HTMLXMLHttpRequestFactory *factory_from_DispatchEx(DispatchEx *iface)
{
    return CONTAINING_RECORD(iface, HTMLXMLHttpRequestFactory, dispex);
}

static HRESULT HTMLXMLHttpRequestFactory_value(DispatchEx *iface, LCID lcid, WORD flags, DISPPARAMS *params,
        VARIANT *res, EXCEPINFO *ei, IServiceProvider *caller)
{
    HTMLXMLHttpRequestFactory *This = factory_from_DispatchEx(iface);
    IHTMLXMLHttpRequest *xhr;
    HRESULT hres;

    TRACE("\n");

    if(flags != DISPATCH_CONSTRUCT) {
        FIXME("flags %x not supported\n", flags);
        return E_NOTIMPL;
    }

    hres = IHTMLXMLHttpRequestFactory_create(&This->IHTMLXMLHttpRequestFactory_iface, &xhr);
    if(FAILED(hres))
        return hres;

    V_VT(res) = VT_DISPATCH;
    V_DISPATCH(res) = (IDispatch*)xhr;
    return S_OK;
}

static const dispex_static_data_vtbl_t HTMLXMLHttpRequestFactory_dispex_vtbl = {
    HTMLXMLHttpRequestFactory_value
};

static const tid_t HTMLXMLHttpRequestFactory_iface_tids[] = {
    IHTMLXMLHttpRequestFactory_tid,
    0
};
static dispex_static_data_t HTMLXMLHttpRequestFactory_dispex = {
    &HTMLXMLHttpRequestFactory_dispex_vtbl,
    IHTMLXMLHttpRequestFactory_tid,
    HTMLXMLHttpRequestFactory_iface_tids
};

HRESULT HTMLXMLHttpRequestFactory_Create(HTMLInnerWindow* window, HTMLXMLHttpRequestFactory **ret_ptr)
{
    HTMLXMLHttpRequestFactory *ret;

    ret = heap_alloc(sizeof(*ret));
    if(!ret)
        return E_OUTOFMEMORY;

    ret->IHTMLXMLHttpRequestFactory_iface.lpVtbl = &HTMLXMLHttpRequestFactoryVtbl;
    ret->ref = 1;
    ret->window = window;

    init_dispex(&ret->dispex, (IUnknown*)&ret->IHTMLXMLHttpRequestFactory_iface,
            &HTMLXMLHttpRequestFactory_dispex);

    *ret_ptr = ret;
    return S_OK;
}