/*
 * Implementation of event-related interfaces for WebBrowser control:
 *
 *  - IConnectionPointContainer
 *  - IConnectionPoint
 *
 * Copyright 2001 John R. Sheets (for CodeWeavers)
 * Copyright 2006 Jacek Caban for CodeWeavers
 *
 * 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 <string.h>
#include "wine/debug.h"
#include "shdocvw.h"

WINE_DEFAULT_DEBUG_CHANNEL(shdocvw);

struct ConnectionPoint {
    IConnectionPoint IConnectionPoint_iface;

    IConnectionPointContainer *container;

    IDispatch **sinks;
    DWORD sinks_size;

    IID iid;
};

/**********************************************************************
 * Implement the IConnectionPointContainer interface
 */

static inline ConnectionPointContainer *impl_from_IConnectionPointContainer(IConnectionPointContainer *iface)
{
    return CONTAINING_RECORD(iface, ConnectionPointContainer, IConnectionPointContainer_iface);
}

static HRESULT WINAPI ConnectionPointContainer_QueryInterface(IConnectionPointContainer *iface,
        REFIID riid, LPVOID *ppv)
{
    ConnectionPointContainer *This = impl_from_IConnectionPointContainer(iface);
    return IUnknown_QueryInterface(This->impl, riid, ppv);
}

static ULONG WINAPI ConnectionPointContainer_AddRef(IConnectionPointContainer *iface)
{
    ConnectionPointContainer *This = impl_from_IConnectionPointContainer(iface);
    return IUnknown_AddRef(This->impl);
}

static ULONG WINAPI ConnectionPointContainer_Release(IConnectionPointContainer *iface)
{
    ConnectionPointContainer *This = impl_from_IConnectionPointContainer(iface);
    return IUnknown_Release(This->impl);
}

static HRESULT WINAPI ConnectionPointContainer_EnumConnectionPoints(IConnectionPointContainer *iface,
        LPENUMCONNECTIONPOINTS *ppEnum)
{
    ConnectionPointContainer *This = impl_from_IConnectionPointContainer(iface);
    FIXME("(%p)->(%p)\n", This, ppEnum);
    return E_NOTIMPL;
}

static HRESULT WINAPI ConnectionPointContainer_FindConnectionPoint(IConnectionPointContainer *iface,
        REFIID riid, LPCONNECTIONPOINT *ppCP)
{
    ConnectionPointContainer *This = impl_from_IConnectionPointContainer(iface);

    if(!ppCP) {
        WARN("ppCP == NULL\n");
        return E_POINTER;
    }

    *ppCP = NULL;

    if(IsEqualGUID(&DIID_DWebBrowserEvents2, riid)) {
        TRACE("(%p)->(DIID_DWebBrowserEvents2 %p)\n", This, ppCP);
        *ppCP = &This->wbe2->IConnectionPoint_iface;
    }else if(IsEqualGUID(&DIID_DWebBrowserEvents, riid)) {
        TRACE("(%p)->(DIID_DWebBrowserEvents %p)\n", This, ppCP);
        *ppCP = &This->wbe->IConnectionPoint_iface;
    }else if(IsEqualGUID(&IID_IPropertyNotifySink, riid)) {
        TRACE("(%p)->(IID_IPropertyNotifySink %p)\n", This, ppCP);
        *ppCP = &This->pns->IConnectionPoint_iface;
    }

    if(*ppCP) {
        IConnectionPoint_AddRef(*ppCP);
        return S_OK;
    }

    WARN("Unsupported IID %s\n", debugstr_guid(riid));
    return CONNECT_E_NOCONNECTION;
}

#undef impl_from_IConnectionPointContainer

static const IConnectionPointContainerVtbl ConnectionPointContainerVtbl =
{
    ConnectionPointContainer_QueryInterface,
    ConnectionPointContainer_AddRef,
    ConnectionPointContainer_Release,
    ConnectionPointContainer_EnumConnectionPoints,
    ConnectionPointContainer_FindConnectionPoint
};


/**********************************************************************
 * Implement the IConnectionPoint interface
 */

static inline ConnectionPoint *impl_from_IConnectionPoint(IConnectionPoint *iface)
{
    return CONTAINING_RECORD(iface, ConnectionPoint, IConnectionPoint_iface);
}

static HRESULT WINAPI ConnectionPoint_QueryInterface(IConnectionPoint *iface,
                                                     REFIID riid, LPVOID *ppv)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);

    *ppv = NULL;

    if(IsEqualGUID(&IID_IUnknown, riid)) {
        TRACE("(%p)->(IID_IUnknown %p)\n", This, ppv);
        *ppv = &This->IConnectionPoint_iface;
    }else if(IsEqualGUID(&IID_IConnectionPoint, riid)) {
        TRACE("(%p)->(IID_IConnectionPoint %p)\n", This, ppv);
        *ppv = &This->IConnectionPoint_iface;
    }

    if(*ppv) {
        IConnectionPointContainer_AddRef(This->container);
        return S_OK;
    }

    WARN("Unsupported interface %s\n", debugstr_guid(riid));
    return E_NOINTERFACE;
}

static ULONG WINAPI ConnectionPoint_AddRef(IConnectionPoint *iface)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);
    return IConnectionPointContainer_AddRef(This->container);
}

static ULONG WINAPI ConnectionPoint_Release(IConnectionPoint *iface)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);
    return IConnectionPointContainer_Release(This->container);
}

static HRESULT WINAPI ConnectionPoint_GetConnectionInterface(IConnectionPoint *iface, IID *pIID)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);

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

    *pIID = This->iid;
    return S_OK;
}

static HRESULT WINAPI ConnectionPoint_GetConnectionPointContainer(IConnectionPoint *iface,
        IConnectionPointContainer **ppCPC)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);

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

    *ppCPC = This->container;
    IConnectionPointContainer_AddRef(This->container);
    return S_OK;
}

static HRESULT WINAPI ConnectionPoint_Advise(IConnectionPoint *iface, IUnknown *pUnkSink,
                                             DWORD *pdwCookie)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);
    IDispatch *disp;
    DWORD i;
    HRESULT hres;

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

    hres = IUnknown_QueryInterface(pUnkSink, &This->iid, (void**)&disp);
    if(FAILED(hres)) {
        hres = IUnknown_QueryInterface(pUnkSink, &IID_IDispatch, (void**)&disp);
        if(FAILED(hres))
            return CONNECT_E_CANNOTCONNECT;
    }

    if(This->sinks) {
        for(i=0; i<This->sinks_size; i++) {
            if(!This->sinks[i])
                break;
        }

        if(i == This->sinks_size)
            This->sinks = heap_realloc(This->sinks,
                                          (++This->sinks_size)*sizeof(*This->sinks));
    }else {
        This->sinks = heap_alloc(sizeof(*This->sinks));
        This->sinks_size = 1;
        i = 0;
    }

    This->sinks[i] = disp;
    *pdwCookie = i+1;

    return S_OK;
}

static HRESULT WINAPI ConnectionPoint_Unadvise(IConnectionPoint *iface, DWORD dwCookie)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);

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

    if(!dwCookie || dwCookie > This->sinks_size || !This->sinks[dwCookie-1])
        return CONNECT_E_NOCONNECTION;

    IDispatch_Release(This->sinks[dwCookie-1]);
    This->sinks[dwCookie-1] = NULL;

    return S_OK;
}

static HRESULT WINAPI ConnectionPoint_EnumConnections(IConnectionPoint *iface,
                                                      IEnumConnections **ppEnum)
{
    ConnectionPoint *This = impl_from_IConnectionPoint(iface);
    FIXME("(%p)->(%p)\n", This, ppEnum);
    return E_NOTIMPL;
}

static const IConnectionPointVtbl ConnectionPointVtbl =
{
    ConnectionPoint_QueryInterface,
    ConnectionPoint_AddRef,
    ConnectionPoint_Release,
    ConnectionPoint_GetConnectionInterface,
    ConnectionPoint_GetConnectionPointContainer,
    ConnectionPoint_Advise,
    ConnectionPoint_Unadvise,
    ConnectionPoint_EnumConnections
};

void call_sink(ConnectionPoint *This, DISPID dispid, DISPPARAMS *dispparams)
{
    DWORD i;

    for(i=0; i<This->sinks_size; i++) {
        if(This->sinks[i])
            IDispatch_Invoke(This->sinks[i], dispid, &IID_NULL, LOCALE_SYSTEM_DEFAULT,
                             DISPATCH_METHOD, dispparams, NULL, NULL, NULL);
    }
}

static void ConnectionPoint_Create(REFIID riid, ConnectionPoint **cp,
                                   IConnectionPointContainer *container)
{
    ConnectionPoint *ret = heap_alloc(sizeof(ConnectionPoint));

    ret->IConnectionPoint_iface.lpVtbl = &ConnectionPointVtbl;

    ret->sinks = NULL;
    ret->sinks_size = 0;
    ret->container = container;

    ret->iid = *riid;

    *cp = ret;
}

static void ConnectionPoint_Destroy(ConnectionPoint *This)
{
    DWORD i;

    for(i=0; i<This->sinks_size; i++) {
        if(This->sinks[i])
            IDispatch_Release(This->sinks[i]);
    }

    heap_free(This->sinks);
    heap_free(This);
}

void ConnectionPointContainer_Init(ConnectionPointContainer *This, IUnknown *impl)
{
    This->IConnectionPointContainer_iface.lpVtbl = &ConnectionPointContainerVtbl;

    ConnectionPoint_Create(&DIID_DWebBrowserEvents2, &This->wbe2, &This->IConnectionPointContainer_iface);
    ConnectionPoint_Create(&DIID_DWebBrowserEvents,  &This->wbe,  &This->IConnectionPointContainer_iface);
    ConnectionPoint_Create(&IID_IPropertyNotifySink, &This->pns,  &This->IConnectionPointContainer_iface);

    This->impl = impl;
}

void ConnectionPointContainer_Destroy(ConnectionPointContainer *This)
{
    ConnectionPoint_Destroy(This->wbe2);
    ConnectionPoint_Destroy(This->wbe);
    ConnectionPoint_Destroy(This->pns);
}