/**
 * Dispatch API functions
 *
 * Copyright 2000  Francois Jacques, Macadamian Technologies Inc.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * TODO: Type coercion is implemented in variant.c but not called yet.
 */

#include "config.h"

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

#include "windef.h"
#include "ole.h"
#include "oleauto.h"
#include "winerror.h"
#include "winreg.h"         /* for HKEY_LOCAL_MACHINE */
#include "winnls.h"         /* for PRIMARYLANGID */

#include "wine/obj_oleaut.h"

#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(ole);
WINE_DECLARE_DEBUG_CHANNEL(typelib);


/******************************************************************************
 *		DispInvoke (OLEAUT32.30)
 *
 *
 * Calls method of an object through its IDispatch interface.
 *
 * NOTES
 * 		- Defer	method invocation to ITypeInfo::Invoke()
 *
 * RETURNS
 *
 * 		S_OK on success.
 */
HRESULT WINAPI DispInvoke(
	VOID       *_this,        /* [in] object instance */
	ITypeInfo  *ptinfo,       /* [in] object's type info */
	DISPID      dispidMember, /* [in] member id */
	USHORT      wFlags,       /* [in] kind of method call */
	DISPPARAMS *pparams,      /* [in] array of arguments */
	VARIANT    *pvarResult,   /* [out] result of method call */
	EXCEPINFO  *pexcepinfo,   /* [out] information about exception */
	UINT       *puArgErr)     /* [out] index of bad argument(if any) */
{
    HRESULT hr = E_FAIL;

    /**
     * TODO:
     * For each param, call DispGetParam to perform type coercion
     */
    FIXME("Coercion of arguments not implemented\n");

    hr = ICOM_CALL7(Invoke,
                    ptinfo,
                    _this,
                    dispidMember,
                    wFlags,
                    pparams, pvarResult, pexcepinfo, puArgErr);

    return (hr);
}


/******************************************************************************
 *		DispGetIDsOfNames (OLEAUT32.29)
 *
 * Convert a set of names to dispids, based on information 
 * contained in object's type library.
 * 
 * NOTES
 * 		- Defers to ITypeInfo::GetIDsOfNames()
 *
 * RETURNS
 *
 * 		S_OK on success.
 */
HRESULT WINAPI DispGetIDsOfNames(
	ITypeInfo  *ptinfo,    /* [in] */
	OLECHAR   **rgszNames, /* [in] */
	UINT        cNames,    /* [in] */
	DISPID     *rgdispid)  /* [out] */
{
    HRESULT hr = E_FAIL;

    hr = ICOM_CALL3(GetIDsOfNames,
                    ptinfo,
                    rgszNames,
                    cNames,
                    rgdispid);
    return (hr);
}

/******************************************************************************
 *		DispGetParam (OLEAUT32.28)
 *
 * Retrive a parameter from a DISPPARAMS structures and coerce it to
 * specified variant type
 *
 * NOTES
 * 		Coercion is done using system (0) locale.
 *
 * RETURNS
 *
 * 		S_OK on success.
 */
HRESULT WINAPI DispGetParam(
	DISPPARAMS *pdispparams, /* [in] */
	UINT        position,    /* [in] */
	VARTYPE     vtTarg,      /* [in] */
	VARIANT    *pvarResult,  /* [out] */
	UINT       *puArgErr)    /* [out] */
{
    /* position is counted backwards */
    UINT pos;
    HRESULT hr;

    TRACE("position=%d, cArgs=%d, cNamedArgs=%d\n",
          position, pdispparams->cArgs, pdispparams->cNamedArgs);
    if (position < pdispparams->cArgs) {
      /* positional arg? */
      pos = pdispparams->cArgs - position - 1;
    } else {
      /* FIXME: is this how to handle named args? */
      for (pos=0; pos<pdispparams->cNamedArgs; pos++)
        if (pdispparams->rgdispidNamedArgs[pos] == position) break;

      if (pos==pdispparams->cNamedArgs)
        return DISP_E_PARAMNOTFOUND;
    }
    hr = VariantChangeType(pvarResult,
                           &pdispparams->rgvarg[pos],
                           0, vtTarg);
    if (hr == DISP_E_TYPEMISMATCH) *puArgErr = pos;
    return hr;
}