/*
 * SHDOCVW - Internet Explorer Web Control
 *
 * Copyright 2001 John R. Sheets (for CodeWeavers)
 * Copyright 2004 Mike McCormack (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 "config.h"

#include <stdarg.h>
#include <stdio.h>

#include "wine/unicode.h"
#include "wine/debug.h"

#include "shdocvw.h"

#include "winreg.h"
#include "shlwapi.h"

#include "initguid.h"

WINE_DEFAULT_DEBUG_CHANNEL(shdocvw);

LONG SHDOCVW_refCount = 0;

HINSTANCE shdocvw_hinstance = 0;
static HMODULE SHDOCVW_hshell32 = 0;
static ITypeInfo *wb_typeinfo = NULL;

HRESULT get_typeinfo(ITypeInfo **typeinfo)
{
    ITypeLib *typelib;
    HRESULT hres;

    if(wb_typeinfo) {
        *typeinfo = wb_typeinfo;
        return S_OK;
    }

    hres = LoadRegTypeLib(&LIBID_SHDocVw, 1, 1, LOCALE_SYSTEM_DEFAULT, &typelib);
    if(FAILED(hres)) {
        ERR("LoadRegTypeLib failed: %08x\n", hres);
        return hres;
    }

    hres = ITypeLib_GetTypeInfoOfGuid(typelib, &IID_IWebBrowser2, &wb_typeinfo);
    ITypeLib_Release(typelib);

    *typeinfo = wb_typeinfo;
    return hres;
}

/*************************************************************************
 * SHDOCVW DllMain
 */
BOOL WINAPI DllMain(HINSTANCE hinst, DWORD fdwReason, LPVOID fImpLoad)
{
    TRACE("%p 0x%x %p\n", hinst, fdwReason, fImpLoad);
    switch (fdwReason)
    {
        case DLL_PROCESS_ATTACH:
        shdocvw_hinstance = hinst;
        register_iewindow_class();
        break;
    case DLL_PROCESS_DETACH:
        if (SHDOCVW_hshell32) FreeLibrary(SHDOCVW_hshell32);
        unregister_iewindow_class();
        if(wb_typeinfo)
            ITypeInfo_Release(wb_typeinfo);
        break;
    }
    return TRUE;
}

/*************************************************************************
 *              DllCanUnloadNow (SHDOCVW.@)
 */
HRESULT WINAPI DllCanUnloadNow(void)
{
    return SHDOCVW_refCount ? S_FALSE : S_OK;
}

/***********************************************************************
 *              DllGetVersion (SHDOCVW.@)
 */
HRESULT WINAPI DllGetVersion(DLLVERSIONINFO *info)
{
    if (info->cbSize != sizeof(DLLVERSIONINFO)) FIXME("support DLLVERSIONINFO2\n");

    /* this is what IE6 on Windows 98 reports */
    info->dwMajorVersion = 6;
    info->dwMinorVersion = 0;
    info->dwBuildNumber = 2600;
    info->dwPlatformID = DLLVER_PLATFORM_WINDOWS;

    return NOERROR;
}

/*************************************************************************
 *              DllInstall (SHDOCVW.@)
 */
HRESULT WINAPI DllInstall(BOOL bInstall, LPCWSTR cmdline)
{
   FIXME("(%s, %s): stub!\n", bInstall ? "TRUE":"FALSE", debugstr_w(cmdline));

   return S_OK;
}

/*************************************************************************
 * SHDOCVW_LoadShell32
 *
 * makes sure the handle to shell32 is valid
 */
static BOOL SHDOCVW_LoadShell32(void)
{
     if (SHDOCVW_hshell32)
       return TRUE;
     return ((SHDOCVW_hshell32 = LoadLibraryA("shell32.dll")) != NULL);
}

/***********************************************************************
 *		@ (SHDOCVW.110)
 *
 * Called by Win98 explorer.exe main binary, definitely has 0
 * parameters.
 */
DWORD WINAPI WinList_Init(void)
{
    FIXME("(), stub!\n");
    return 0x0deadfeed;
}

/***********************************************************************
 *		@ (SHDOCVW.118)
 *
 * Called by Win98 explorer.exe main binary, definitely has only one
 * parameter.
 */
static BOOL (WINAPI *pShellDDEInit)(BOOL start) = NULL;

BOOL WINAPI ShellDDEInit(BOOL start)
{
    TRACE("(%d)\n", start);

    if (!pShellDDEInit)
    {
      if (!SHDOCVW_LoadShell32())
        return FALSE;
      pShellDDEInit = (void *)GetProcAddress(SHDOCVW_hshell32, (LPCSTR)188);
    }

    if (pShellDDEInit)
      return pShellDDEInit(start);
    else
      return FALSE;
}

/***********************************************************************
 *		@ (SHDOCVW.125)
 *
 * Called by Win98 explorer.exe main binary, definitely has 0
 * parameters.
 */
DWORD WINAPI RunInstallUninstallStubs(void)
{
    FIXME("(), stub!\n");
    return 0x0deadbee;
}

/***********************************************************************
 *              SetQueryNetSessionCount (SHDOCVW.@)
 */
DWORD WINAPI SetQueryNetSessionCount(DWORD arg)
{
    FIXME("(%u), stub!\n", arg);
    return 0;
}

/**********************************************************************
 * OpenURL  (SHDOCVW.@)
 */
void WINAPI OpenURL(HWND hWnd, HINSTANCE hInst, LPCSTR lpcstrUrl, int nShowCmd)
{
    FIXME("%p %p %s %d\n", hWnd, hInst, debugstr_a(lpcstrUrl), nShowCmd);
}

/**********************************************************************
 * Some forwards (by ordinal) to SHLWAPI
 */

static void* fetch_shlwapi_ordinal(unsigned ord)
{
    static const WCHAR shlwapiW[] = {'s','h','l','w','a','p','i','.','d','l','l','\0'};
    static HANDLE h;

    if (!h && !(h = GetModuleHandleW(shlwapiW))) return NULL;
    return (void*)GetProcAddress(h, (const char*)ord);
}

/******************************************************************
 *		WhichPlatformFORWARD            (SHDOCVW.@)
 */
DWORD WINAPI WhichPlatformFORWARD(void)
{
    static DWORD (WINAPI *p)(void);

    if (p || (p = fetch_shlwapi_ordinal(276))) return p();
    return 1; /* not integrated, see shlwapi.WhichPlatform */
}

/******************************************************************
 *		StopWatchModeFORWARD            (SHDOCVW.@)
 */
void WINAPI StopWatchModeFORWARD(void)
{
    static void (WINAPI *p)(void);

    if (p || (p = fetch_shlwapi_ordinal(241))) p();
}

/******************************************************************
 *		StopWatchFlushFORWARD            (SHDOCVW.@)
 */
void WINAPI StopWatchFlushFORWARD(void)
{
    static void (WINAPI *p)(void);

    if (p || (p = fetch_shlwapi_ordinal(242))) p();
}

/******************************************************************
 *		StopWatchWFORWARD            (SHDOCVW.@)
 */
DWORD WINAPI StopWatchWFORWARD(DWORD dwClass, LPCWSTR lpszStr, DWORD dwUnknown,
                               DWORD dwMode, DWORD dwTimeStamp)
{
    static DWORD (WINAPI *p)(DWORD, LPCWSTR, DWORD, DWORD, DWORD);

    if (p || (p = fetch_shlwapi_ordinal(243)))
        return p(dwClass, lpszStr, dwUnknown, dwMode, dwTimeStamp);
    return ERROR_CALL_NOT_IMPLEMENTED;
}

/******************************************************************
 *		StopWatchAFORWARD            (SHDOCVW.@)
 */
DWORD WINAPI StopWatchAFORWARD(DWORD dwClass, LPCSTR lpszStr, DWORD dwUnknown,
                               DWORD dwMode, DWORD dwTimeStamp)
{
    static DWORD (WINAPI *p)(DWORD, LPCSTR, DWORD, DWORD, DWORD);

    if (p || (p = fetch_shlwapi_ordinal(244)))
        return p(dwClass, lpszStr, dwUnknown, dwMode, dwTimeStamp);
    return ERROR_CALL_NOT_IMPLEMENTED;
}