/*
 * IDirectMusicInstrument Implementation
 *
 * Copyright (C) 2003-2004 Rok Mandeljc
 *
 * This program 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 program 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 program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#include "dmusic_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(dmusic);

static const GUID IID_IDirectMusicInstrumentPRIVATE = { 0xbcb20080, 0xa40c, 0x11d1, { 0x86, 0xbc, 0x00, 0xc0, 0x4f, 0xbf, 0x8f, 0xef } };

/* IDirectMusicInstrument IUnknown part: */
static HRESULT WINAPI IDirectMusicInstrumentImpl_QueryInterface(LPDIRECTMUSICINSTRUMENT iface, REFIID riid, LPVOID *ret_iface)
{
    TRACE("(%p)->(%s, %p)\n", iface, debugstr_dmguid(riid), ret_iface);

    if (IsEqualIID(riid, &IID_IUnknown) ||
        IsEqualIID(riid, &IID_IDirectMusicInstrument))
    {
        *ret_iface = iface;
        IDirectMusicInstrument_AddRef(iface);
        return S_OK;
    }
    else if (IsEqualIID(riid, &IID_IDirectMusicInstrumentPRIVATE))
    {
        /* it seems to me that this interface is only basic IUnknown, without any
         * other inherited functions... *sigh* this is the worst scenario, since it means
         * that whoever calls it knows the layout of original implementation table and therefore
         * tries to get data by direct access... expect crashes
         */
        FIXME("*sigh*... requested private/unspecified interface\n");

        *ret_iface = iface;
        IDirectMusicInstrument_AddRef(iface);
        return S_OK;
    }

    WARN("(%p)->(%s, %p): not found\n", iface, debugstr_dmguid(riid), ret_iface);

    return E_NOINTERFACE;
}

static ULONG WINAPI IDirectMusicInstrumentImpl_AddRef(LPDIRECTMUSICINSTRUMENT iface)
{
    IDirectMusicInstrumentImpl *This = impl_from_IDirectMusicInstrument(iface);
    ULONG ref = InterlockedIncrement(&This->ref);

    TRACE("(%p)->(): new ref = %u\n", iface, ref);

    DMUSIC_LockModule();

    return ref;
}

static ULONG WINAPI IDirectMusicInstrumentImpl_Release(LPDIRECTMUSICINSTRUMENT iface)
{
    IDirectMusicInstrumentImpl *This = impl_from_IDirectMusicInstrument(iface);
    ULONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p)->(): new ref = %u\n", iface, ref);

    if (!ref)
        HeapFree(GetProcessHeap(), 0, This);

    DMUSIC_UnlockModule();

    return ref;
}

/* IDirectMusicInstrumentImpl IDirectMusicInstrument part: */
static HRESULT WINAPI IDirectMusicInstrumentImpl_GetPatch(LPDIRECTMUSICINSTRUMENT iface, DWORD* pdwPatch)
{
    IDirectMusicInstrumentImpl *This = impl_from_IDirectMusicInstrument(iface);

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

    *pdwPatch = MIDILOCALE2Patch(&This->pHeader->Locale);

    return S_OK;
}

static HRESULT WINAPI IDirectMusicInstrumentImpl_SetPatch(LPDIRECTMUSICINSTRUMENT iface, DWORD dwPatch)
{
    IDirectMusicInstrumentImpl *This = impl_from_IDirectMusicInstrument(iface);

    TRACE("(%p)->(%d): stub\n", This, dwPatch);

    Patch2MIDILOCALE(dwPatch, &This->pHeader->Locale);

    return S_OK;
}

static const IDirectMusicInstrumentVtbl DirectMusicInstrument_Vtbl =
{
    IDirectMusicInstrumentImpl_QueryInterface,
    IDirectMusicInstrumentImpl_AddRef,
    IDirectMusicInstrumentImpl_Release,
    IDirectMusicInstrumentImpl_GetPatch,
    IDirectMusicInstrumentImpl_SetPatch
};

/* for ClassFactory */
HRESULT DMUSIC_CreateDirectMusicInstrumentImpl (LPCGUID lpcGUID, LPVOID* ppobj, LPUNKNOWN pUnkOuter) {
	IDirectMusicInstrumentImpl* dminst;
	
	dminst = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IDirectMusicInstrumentImpl));
	if (NULL == dminst) {
		*ppobj = NULL;
		return E_OUTOFMEMORY;
	}
	dminst->IDirectMusicInstrument_iface.lpVtbl = &DirectMusicInstrument_Vtbl;
	dminst->ref = 0; /* will be inited by QueryInterface */
	
	return IDirectMusicInstrument_QueryInterface(&dminst->IDirectMusicInstrument_iface, lpcGUID, ppobj);
}

static HRESULT read_from_stream(IStream *stream, void *data, ULONG size)
{
    ULONG bytes_read;
    HRESULT hr;

    hr = IStream_Read(stream, data, size, &bytes_read);
    if(FAILED(hr)){
        TRACE("IStream_Read failed: %08x\n", hr);
        return hr;
    }
    if (bytes_read < size) {
        TRACE("Didn't read full chunk: %u < %u\n", bytes_read, size);
        return E_FAIL;
    }

    return S_OK;
}

static inline DWORD subtract_bytes(DWORD len, DWORD bytes)
{
    if(bytes > len){
        TRACE("Apparent mismatch in chunk lengths? %u bytes remaining, %u bytes read\n", len, bytes);
        return 0;
    }
    return len - bytes;
}

static inline HRESULT advance_stream(IStream *stream, ULONG bytes)
{
    LARGE_INTEGER move;
    HRESULT ret;

    move.QuadPart = bytes;

    ret = IStream_Seek(stream, move, STREAM_SEEK_CUR, NULL);
    if (FAILED(ret))
        WARN("IStream_Seek failed: %08x\n", ret);

    return ret;
}

/* Function that loads all instrument data and which is called from IDirectMusicCollection_GetInstrument as in native */
HRESULT IDirectMusicInstrumentImpl_CustomLoad(IDirectMusicInstrument *iface, IStream *stream)
{
    IDirectMusicInstrumentImpl *This = impl_from_IDirectMusicInstrument(iface);
    HRESULT hr;
    DMUS_PRIVATE_CHUNK chunk;
    ULONG length = This->length;

    TRACE("(%p, %p): offset = 0x%s, length = %u)\n", This, stream, wine_dbgstr_longlong(This->liInstrumentPosition.QuadPart), This->length);

    hr = IStream_Seek(stream, This->liInstrumentPosition, STREAM_SEEK_SET, NULL);
    if (FAILED(hr))
    {
        WARN("IStream_Seek failed: %08x\n", hr);
        return DMUS_E_UNSUPPORTED_STREAM;
    }

    while (length)
    {
        hr = read_from_stream(stream, &chunk, sizeof(chunk));
        if (FAILED(hr))
            return DMUS_E_UNSUPPORTED_STREAM;

        length = subtract_bytes(length, sizeof(chunk) + chunk.dwSize);

        switch (chunk.fccID)
        {
            case FOURCC_INSH:
            case FOURCC_DLID:
                TRACE("Chunk %s: %u bytes\n", debugstr_fourcc(chunk.fccID), chunk.dwSize);

                /* Instrument header and id are already set so just skip */
                hr = advance_stream(stream, chunk.dwSize);
                if (FAILED(hr))
                    return DMUS_E_UNSUPPORTED_STREAM;

                break;

            default:
                TRACE("Unknown chunk %s: %u bytes\n", debugstr_fourcc(chunk.fccID), chunk.dwSize);

                hr = advance_stream(stream, chunk.dwSize);
                if (FAILED(hr))
                    return DMUS_E_UNSUPPORTED_STREAM;

                break;
        }
    }

    return S_OK;
}