/*
 * PROJECT:     Recycle bin management
 * LICENSE:     GPL v2 - See COPYING in the top level directory
 * FILE:        lib/recyclebin/recyclebin_v5_enumerator.c
 * PURPOSE:     Enumerates contents of a MS Windows 2000/XP/2003 recyclebin
 * PROGRAMMERS: Copyright 2006-2007 Hervé Poussineau (hpoussin@reactos.org)
 */

#define COBJMACROS
#include "recyclebin_v5.h"

WINE_DEFAULT_DEBUG_CHANNEL(recyclebin);

struct RecycleBin5File
{
	ULONG ref;
	IRecycleBin5 *recycleBin;
	DELETED_FILE_RECORD deletedFile;
	IRecycleBinFile recycleBinFileImpl;
	WCHAR FullName[ANY_SIZE];
};

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_QueryInterface(
	IN IRecycleBinFile *This,
	IN REFIID riid,
	OUT void **ppvObject)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);

	TRACE("(%p, %s, %p)\n", This, debugstr_guid(riid), ppvObject);

	if (!ppvObject)
		return E_POINTER;

	if (IsEqualIID(riid, &IID_IUnknown))
		*ppvObject = &s->recycleBinFileImpl;
	else if (IsEqualIID(riid, &IID_IRecycleBinFile))
		*ppvObject = &s->recycleBinFileImpl;
	else
	{
		*ppvObject = NULL;
		return E_NOINTERFACE;
	}

	IUnknown_AddRef(This);
	return S_OK;
}

static ULONG STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_AddRef(
	IN IRecycleBinFile *This)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	ULONG refCount = InterlockedIncrement((PLONG)&s->ref);
	TRACE("(%p)\n", This);
	return refCount;
}

static VOID
RecycleBin5File_Destructor(
	struct RecycleBin5File *s)
{
	TRACE("(%p)\n", s);

	IRecycleBin5_Release(s->recycleBin);
	CoTaskMemFree(s);
}

static ULONG STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_Release(
	IN IRecycleBinFile *This)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	ULONG refCount;

	TRACE("(%p)\n", This);

	refCount = InterlockedDecrement((PLONG)&s->ref);

	if (refCount == 0)
		RecycleBin5File_Destructor(s);

	return refCount;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetLastModificationTime(
	IN IRecycleBinFile *This,
	OUT FILETIME *pLastModificationTime)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	HRESULT hr;
	DWORD dwAttributes;
	HANDLE hFile;

	TRACE("(%p, %p)\n", This, pLastModificationTime);

	dwAttributes = GetFileAttributesW(s->FullName);
	if (dwAttributes == INVALID_FILE_ATTRIBUTES)
		return HRESULT_FROM_WIN32(GetLastError());
	if (dwAttributes & FILE_ATTRIBUTE_DIRECTORY)
		hFile = CreateFileW(s->FullName, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, NULL);
	else
		hFile = CreateFileW(s->FullName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
	if (hFile == INVALID_HANDLE_VALUE)
		return HRESULT_FROM_WIN32(GetLastError());

	if (GetFileTime(hFile, NULL, NULL, pLastModificationTime))
		hr = S_OK;
	else
		hr = HRESULT_FROM_WIN32(GetLastError());
	CloseHandle(hFile);
	return hr;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetDeletionTime(
	IN IRecycleBinFile *This,
	OUT FILETIME *pDeletionTime)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	TRACE("(%p, %p)\n", This, pDeletionTime);
	*pDeletionTime = s->deletedFile.DeletionTime;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetFileSize(
	IN IRecycleBinFile *This,
	OUT ULARGE_INTEGER *pFileSize)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	HRESULT hr;
	DWORD dwAttributes;
	HANDLE hFile;

	TRACE("(%p, %p)\n", This, pFileSize);

	dwAttributes = GetFileAttributesW(s->FullName);
	if (dwAttributes == INVALID_FILE_ATTRIBUTES)
		return HRESULT_FROM_WIN32(GetLastError());
	if (dwAttributes & FILE_ATTRIBUTE_DIRECTORY)
	{
		pFileSize->QuadPart = 0;
		return S_OK;
	}

	hFile = CreateFileW(s->FullName, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
	if (hFile == INVALID_HANDLE_VALUE)
		return HRESULT_FROM_WIN32(GetLastError());
	pFileSize->u.LowPart = GetFileSize(hFile, &pFileSize->u.HighPart);
	if (pFileSize->u.LowPart != INVALID_FILE_SIZE)
		hr = S_OK;
	else
		hr = HRESULT_FROM_WIN32(GetLastError());
	CloseHandle(hFile);
	return hr;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetPhysicalFileSize(
	IN IRecycleBinFile *This,
	OUT ULARGE_INTEGER *pPhysicalFileSize)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	TRACE("(%p, %p)\n", This, pPhysicalFileSize);
	pPhysicalFileSize->u.HighPart = 0;
	pPhysicalFileSize->u.LowPart = s->deletedFile.dwPhysicalFileSize;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetAttributes(
	IN IRecycleBinFile *This,
	OUT DWORD *pAttributes)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	DWORD dwAttributes;

	TRACE("(%p, %p)\n", This, pAttributes);

	dwAttributes = GetFileAttributesW(s->FullName);
	if (dwAttributes == INVALID_FILE_ATTRIBUTES)
		return HRESULT_FROM_WIN32(GetLastError());

	*pAttributes = dwAttributes;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_GetFileName(
	IN IRecycleBinFile *This,
	IN DWORD BufferSize,
	IN OUT LPWSTR Buffer,
	OUT DWORD *RequiredSize)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	DWORD dwRequired;

	TRACE("(%p, %u, %p, %p)\n", This, BufferSize, Buffer, RequiredSize);

	dwRequired = (DWORD)(wcslen(s->deletedFile.FileNameW) + 1) * sizeof(WCHAR);
	if (RequiredSize)
		*RequiredSize = dwRequired;

	if (BufferSize == 0 && !Buffer)
		return S_OK;

	if (BufferSize < dwRequired)
		return E_OUTOFMEMORY;
	CopyMemory(Buffer, s->deletedFile.FileNameW, dwRequired);
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_Delete(
	IN IRecycleBinFile *This)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	TRACE("(%p)\n", This);
	return IRecycleBin5_Delete(s->recycleBin, s->FullName, &s->deletedFile);
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5File_RecycleBinFile_Restore(
	IN IRecycleBinFile *This)
{
	struct RecycleBin5File *s = CONTAINING_RECORD(This, struct RecycleBin5File, recycleBinFileImpl);
	TRACE("(%p)\n", This);
	return IRecycleBin5_Restore(s->recycleBin, s->FullName, &s->deletedFile);
}

CONST_VTBL struct IRecycleBinFileVtbl RecycleBin5FileVtbl =
{
	RecycleBin5File_RecycleBinFile_QueryInterface,
	RecycleBin5File_RecycleBinFile_AddRef,
	RecycleBin5File_RecycleBinFile_Release,
	RecycleBin5File_RecycleBinFile_GetLastModificationTime,
	RecycleBin5File_RecycleBinFile_GetDeletionTime,
	RecycleBin5File_RecycleBinFile_GetFileSize,
	RecycleBin5File_RecycleBinFile_GetPhysicalFileSize,
	RecycleBin5File_RecycleBinFile_GetAttributes,
	RecycleBin5File_RecycleBinFile_GetFileName,
	RecycleBin5File_RecycleBinFile_Delete,
	RecycleBin5File_RecycleBinFile_Restore,
};

static HRESULT
RecycleBin5File_Constructor(
	IN IRecycleBin5 *prb,
	IN LPCWSTR Folder,
	IN PDELETED_FILE_RECORD pDeletedFile,
	OUT IRecycleBinFile **ppFile)
{
	struct RecycleBin5File *s = NULL;
	LPCWSTR Extension;
	SIZE_T Needed;

	if (!ppFile)
		return E_POINTER;

	Extension = wcsrchr(pDeletedFile->FileNameW, '.');
	if (Extension < wcsrchr(pDeletedFile->FileNameW, '\\'))
		Extension = NULL;
	Needed = wcslen(Folder) + 13;
	if (Extension)
		Needed += wcslen(Extension);
	Needed *= sizeof(WCHAR);

	s = CoTaskMemAlloc(sizeof(struct RecycleBin5File) + Needed);
	if (!s)
		return E_OUTOFMEMORY;
	ZeroMemory(s, sizeof(struct RecycleBin5File) + Needed);
	s->recycleBinFileImpl.lpVtbl = &RecycleBin5FileVtbl;
	s->ref = 1;
	s->deletedFile = *pDeletedFile;
	s->recycleBin = prb;
	IRecycleBin5_AddRef(s->recycleBin);
	*ppFile = &s->recycleBinFileImpl;
	wsprintfW(s->FullName, L"%s\\D%c%lu%s", Folder, pDeletedFile->dwDriveNumber + 'a', pDeletedFile->dwRecordUniqueId, Extension);
	if (GetFileAttributesW(s->FullName) == INVALID_FILE_ATTRIBUTES)
	{
		RecycleBin5File_Destructor(s);
		return E_FAIL;
	}

	return S_OK;
}

struct RecycleBin5Enum
{
	ULONG ref;
	IRecycleBin5 *recycleBin;
	HANDLE hInfo;
	INFO2_HEADER *pInfo;
	DWORD dwCurrent;
	IRecycleBinEnumList recycleBinEnumImpl;
	WCHAR szPrefix[ANY_SIZE];
};

static HRESULT STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_QueryInterface(
	IN IRecycleBinEnumList *This,
	IN REFIID riid,
	OUT void **ppvObject)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);

	TRACE("(%p, %s, %p)\n", This, debugstr_guid(riid), ppvObject);

	if (!ppvObject)
		return E_POINTER;

	if (IsEqualIID(riid, &IID_IUnknown))
		*ppvObject = &s->recycleBinEnumImpl;
	else if (IsEqualIID(riid, &IID_IRecycleBinEnumList))
		*ppvObject = &s->recycleBinEnumImpl;
	else
	{
		*ppvObject = NULL;
		return E_NOINTERFACE;
	}

	IUnknown_AddRef(This);
	return S_OK;
}

static ULONG STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_AddRef(
	IN IRecycleBinEnumList *This)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);
	ULONG refCount = InterlockedIncrement((PLONG)&s->ref);
	TRACE("(%p)\n", This);
	return refCount;
}

static VOID
RecycleBin5Enum_Destructor(
	struct RecycleBin5Enum *s)
{
	TRACE("(%p)\n", s);

	IRecycleBin5_OnClosing(s->recycleBin, &s->recycleBinEnumImpl);
	UnmapViewOfFile(s->pInfo);
	IRecycleBin5_Release(s->recycleBin);
	CoTaskMemFree(s);
}

static ULONG STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_Release(
	IN IRecycleBinEnumList *This)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);
	ULONG refCount;

	TRACE("(%p)\n", This);

	refCount = InterlockedDecrement((PLONG)&s->ref);

	if (refCount == 0)
		RecycleBin5Enum_Destructor(s);

	return refCount;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_Next(
	IRecycleBinEnumList *This,
	IN DWORD celt,
	IN OUT IRecycleBinFile **rgelt,
	OUT DWORD *pceltFetched)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);
	ULARGE_INTEGER FileSize;
	INFO2_HEADER *pHeader = s->pInfo;
	DELETED_FILE_RECORD *pDeletedFile;
	DWORD fetched = 0, i;
	DWORD dwEntries;
	HRESULT hr;

	TRACE("(%p, %u, %p, %p)\n", This, celt, rgelt, pceltFetched);

	if (!rgelt)
		return E_POINTER;
	if (!pceltFetched && celt > 1)
		return E_INVALIDARG;

	FileSize.u.LowPart = GetFileSize(s->hInfo, &FileSize.u.HighPart);
	if (FileSize.u.LowPart == 0)
		return HRESULT_FROM_WIN32(GetLastError());
	dwEntries = (DWORD)((FileSize.QuadPart - sizeof(INFO2_HEADER)) / sizeof(DELETED_FILE_RECORD));

	i = s->dwCurrent;
	pDeletedFile = (DELETED_FILE_RECORD *)(pHeader + 1) + i;
	for (; i < dwEntries && fetched < celt; i++)
	{
		hr = RecycleBin5File_Constructor(s->recycleBin, s->szPrefix, pDeletedFile, &rgelt[fetched]);
		if (SUCCEEDED(hr))
			fetched++;
		pDeletedFile++;
	}

	s->dwCurrent = i;
	if (pceltFetched)
		*pceltFetched = fetched;
	if (fetched == celt)
		return S_OK;
	else
		return S_FALSE;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_Skip(
	IN IRecycleBinEnumList *This,
	IN DWORD celt)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);
	TRACE("(%p, %u)\n", This, celt);
	s->dwCurrent += celt;
	return S_OK;
}

static HRESULT STDMETHODCALLTYPE
RecycleBin5Enum_RecycleBinEnumList_Reset(
	IN IRecycleBinEnumList *This)
{
	struct RecycleBin5Enum *s = CONTAINING_RECORD(This, struct RecycleBin5Enum, recycleBinEnumImpl);
	TRACE("(%p)\n", This);
	s->dwCurrent = 0;
	return S_OK;
}

CONST_VTBL struct IRecycleBinEnumListVtbl RecycleBin5EnumVtbl =
{
	RecycleBin5Enum_RecycleBinEnumList_QueryInterface,
	RecycleBin5Enum_RecycleBinEnumList_AddRef,
	RecycleBin5Enum_RecycleBinEnumList_Release,
	RecycleBin5Enum_RecycleBinEnumList_Next,
	RecycleBin5Enum_RecycleBinEnumList_Skip,
	RecycleBin5Enum_RecycleBinEnumList_Reset,
};

HRESULT
RecycleBin5Enum_Constructor(
	IN IRecycleBin5 *prb,
	IN HANDLE hInfo,
	IN HANDLE hInfoMapped,
	IN LPCWSTR szPrefix,
	OUT IUnknown **ppUnknown)
{
	struct RecycleBin5Enum *s = NULL;
	SIZE_T Needed;

	if (!ppUnknown)
		return E_POINTER;

	Needed = (wcslen(szPrefix) + 1) * sizeof(WCHAR);

	s = CoTaskMemAlloc(sizeof(struct RecycleBin5Enum) + Needed);
	if (!s)
		return E_OUTOFMEMORY;
	ZeroMemory(s, sizeof(struct RecycleBin5Enum) + Needed);
	s->recycleBinEnumImpl.lpVtbl = &RecycleBin5EnumVtbl;
	s->ref = 1;
	s->recycleBin = prb;
	wcscpy(s->szPrefix, szPrefix);
	s->hInfo = hInfo;
	s->pInfo = MapViewOfFile(hInfoMapped, FILE_MAP_READ, 0, 0, 0);
	if (!s->pInfo)
	{
		CoTaskMemFree(s);
		return HRESULT_FROM_WIN32(GetLastError());
	}
	if (s->pInfo->dwVersion != 5 || s->pInfo->dwRecordSize != sizeof(DELETED_FILE_RECORD))
	{
		UnmapViewOfFile(s->pInfo);
		CoTaskMemFree(s);
		return E_FAIL;
	}
	IRecycleBin5_AddRef(s->recycleBin);
	*ppUnknown = (IUnknown *)&s->recycleBinEnumImpl;

	return S_OK;
}