/* 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}};

static ULONG WINAPI IDirectMusicInstrumentImpl_IUnknown_AddRef (LPUNKNOWN iface);
static ULONG WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_AddRef (LPDIRECTMUSICINSTRUMENT iface);

/* IDirectMusicInstrument IUnknown part: */
static HRESULT WINAPI IDirectMusicInstrumentImpl_IUnknown_QueryInterface (LPUNKNOWN iface, REFIID riid, LPVOID *ppobj) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, UnknownVtbl, iface);
	TRACE("(%p, %s, %p)\n", This, debugstr_dmguid(riid), ppobj);
	
	if (IsEqualIID (riid, &IID_IUnknown)) {
		*ppobj = &This->UnknownVtbl;
		IDirectMusicInstrumentImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
		return S_OK;	
	} else if (IsEqualIID (riid, &IID_IDirectMusicInstrument)) {
		*ppobj = &This->InstrumentVtbl;
		IDirectMusicInstrumentImpl_IDirectMusicInstrument_AddRef ((LPDIRECTMUSICINSTRUMENT)&This->InstrumentVtbl);
		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");
		*ppobj = &This->UnknownVtbl;
		IDirectMusicInstrumentImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
		return S_OK;	
	}
	
	WARN("(%p, %s, %p): not found\n", This, debugstr_dmguid(riid), ppobj);
	return E_NOINTERFACE;
}

static ULONG WINAPI IDirectMusicInstrumentImpl_IUnknown_AddRef (LPUNKNOWN iface) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, UnknownVtbl, iface);
	ULONG refCount = InterlockedIncrement(&This->ref);

	TRACE("(%p)->(ref before=%u)\n", This, refCount - 1);

	DMUSIC_LockModule();

	return refCount;
}

static ULONG WINAPI IDirectMusicInstrumentImpl_IUnknown_Release (LPUNKNOWN iface) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, UnknownVtbl, iface);
	ULONG refCount = InterlockedDecrement(&This->ref);

	TRACE("(%p)->(ref before=%u)\n", This, refCount + 1);

	if (!refCount) {
		HeapFree(GetProcessHeap(), 0, This);
	}

	DMUSIC_UnlockModule();
	
	return refCount;
}

static const IUnknownVtbl DirectMusicInstrument_Unknown_Vtbl = {
	IDirectMusicInstrumentImpl_IUnknown_QueryInterface,
	IDirectMusicInstrumentImpl_IUnknown_AddRef,
	IDirectMusicInstrumentImpl_IUnknown_Release
};

/* IDirectMusicInstrumentImpl IDirectMusicInstrument part: */
static HRESULT WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_QueryInterface (LPDIRECTMUSICINSTRUMENT iface, REFIID riid, LPVOID *ppobj) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
	return IDirectMusicInstrumentImpl_IUnknown_QueryInterface ((LPUNKNOWN)&This->UnknownVtbl, riid, ppobj);
}

static ULONG WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_AddRef (LPDIRECTMUSICINSTRUMENT iface) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
	return IDirectMusicInstrumentImpl_IUnknown_AddRef ((LPUNKNOWN)&This->UnknownVtbl);
}

static ULONG WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_Release (LPDIRECTMUSICINSTRUMENT iface) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
	return IDirectMusicInstrumentImpl_IUnknown_Release ((LPUNKNOWN)&This->UnknownVtbl);
}

static HRESULT WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_GetPatch (LPDIRECTMUSICINSTRUMENT iface, DWORD* pdwPatch) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
	TRACE("(%p, %p)\n", This, pdwPatch);	
	*pdwPatch = MIDILOCALE2Patch(&This->pHeader->Locale);
	return S_OK;
}

static HRESULT WINAPI IDirectMusicInstrumentImpl_IDirectMusicInstrument_SetPatch (LPDIRECTMUSICINSTRUMENT iface, DWORD dwPatch) {
	ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
	TRACE("(%p, %d): stub\n", This, dwPatch);
	Patch2MIDILOCALE(dwPatch, &This->pHeader->Locale);
	return S_OK;
}

static const IDirectMusicInstrumentVtbl DirectMusicInstrument_Instrument_Vtbl = {
	IDirectMusicInstrumentImpl_IDirectMusicInstrument_QueryInterface,
	IDirectMusicInstrumentImpl_IDirectMusicInstrument_AddRef,
	IDirectMusicInstrumentImpl_IDirectMusicInstrument_Release,
	IDirectMusicInstrumentImpl_IDirectMusicInstrument_GetPatch,
	IDirectMusicInstrumentImpl_IDirectMusicInstrument_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->UnknownVtbl = &DirectMusicInstrument_Unknown_Vtbl;
	dminst->InstrumentVtbl = &DirectMusicInstrument_Instrument_Vtbl;
	dminst->ref = 0; /* will be inited by QueryInterface */
	
	return IDirectMusicInstrumentImpl_IUnknown_QueryInterface ((LPUNKNOWN)&dminst->UnknownVtbl, lpcGUID, ppobj);
}

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

    hr = IStream_Read(stream, data, size, &readed);
    if(FAILED(hr)){
        TRACE("IStream_Read failed: %08x\n", hr);
        return hr;
    }
    if(readed < size){
        TRACE("Didn't read full chunk: %u < %u\n", readed, 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 HRESULT load_instrument(IDirectMusicInstrumentImpl *This, IStream *stream, DWORD length)
{
    HRESULT hr;
    FOURCC fourcc;
    DWORD bytes;
    LARGE_INTEGER move;

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

        hr = read_from_stream(stream, &bytes, sizeof(bytes));
        if(FAILED(hr))
            return hr;

        length = subtract_bytes(length, sizeof(fourcc) + sizeof(bytes));

        switch(fourcc){
        case FOURCC_INSH:
            TRACE("INSH chunk: %u bytes\n", bytes);
            hr = read_from_stream(stream, This->pHeader, sizeof(*This->pHeader));
            if(FAILED(hr))
                return hr;

            move.QuadPart = bytes - sizeof(*This->pHeader);
            hr = IStream_Seek(stream, move, STREAM_SEEK_CUR, NULL);
            if(FAILED(hr)){
                WARN("IStream_Seek failed: %08x\n", hr);
                return hr;
            }

            length = subtract_bytes(length, bytes);
            break;

        case FOURCC_DLID:
            TRACE("DLID chunk: %u bytes\n", bytes);
            hr = read_from_stream(stream, This->pInstrumentID, sizeof(*This->pInstrumentID));
            if(FAILED(hr))
                return hr;

            move.QuadPart = bytes - sizeof(*This->pInstrumentID);
            hr = IStream_Seek(stream, move, STREAM_SEEK_CUR, NULL);
            if(FAILED(hr)){
                WARN("IStream_Seek failed: %08x\n", hr);
                return hr;
            }

            length = subtract_bytes(length, bytes);
            break;

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

            move.QuadPart = bytes;
            hr = IStream_Seek(stream, move, STREAM_SEEK_CUR, NULL);
            if(FAILED(hr)){
                WARN("IStream_Seek failed: %08x\n", hr);
                return hr;
            }

            length = subtract_bytes(length, bytes);
            break;
        }
    }

    return S_OK;
}

/* aux. function that completely loads instrument; my tests indicate that it's 
   called somewhere around IDirectMusicCollection_GetInstrument */
HRESULT IDirectMusicInstrumentImpl_Custom_Load (LPDIRECTMUSICINSTRUMENT iface, LPSTREAM stream)
{
    ICOM_THIS_MULTI(IDirectMusicInstrumentImpl, InstrumentVtbl, iface);
    LARGE_INTEGER move;
    FOURCC fourcc;
    DWORD bytes;
    HRESULT hr;

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

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

    hr = read_from_stream(stream, &fourcc, sizeof(fourcc));
    if(FAILED(hr))
        goto load_failure;

    if(fourcc != FOURCC_LIST){
        WARN("Loading failed: Expected LIST chunk, got: %s\n", debugstr_fourcc(fourcc));
        goto load_failure;
    }

    hr = read_from_stream(stream, &bytes, sizeof(bytes));
    if(FAILED(hr))
        goto load_failure;

    TRACE("LIST chunk: %u bytes\n", bytes);
    while(1){
        hr = read_from_stream(stream, &fourcc, sizeof(fourcc));
        if(FAILED(hr))
            goto load_failure;

        switch(fourcc){
        case FOURCC_INS:
            TRACE("INS  chunk: (no byte count)\n");
            hr = load_instrument(This, stream, bytes - sizeof(FOURCC));
            if(FAILED(hr))
                goto load_failure;
            break;

        default:
            hr = read_from_stream(stream, &bytes, sizeof(bytes));
            if(FAILED(hr))
                goto load_failure;

            TRACE("Unknown chunk %s: %u bytes\n", debugstr_fourcc(fourcc), bytes);

            move.QuadPart = bytes;
            hr = IStream_Seek(stream, move, STREAM_SEEK_CUR, NULL);
            if(FAILED(hr)){
                WARN("IStream_Seek failed: %08x\n", hr);
                return hr;
            }

            break;
        }
    }

    return S_OK;

load_failure:
    return DMUS_E_UNSUPPORTED_STREAM;
}