/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_widget_WinUtils_h__
#define mozilla_widget_WinUtils_h__

#include "nscore.h"
#include <windows.h>
#include <shobjidl.h>
#include <uxtheme.h>
#include <dwmapi.h>

// Undo the windows.h damage
#undef GetMessage
#undef CreateEvent
#undef GetClassName
#undef GetBinaryType
#undef RemoveDirectory

#include "nsString.h"
#include "nsRegion.h"
#include "nsRect.h"

#include "nsIRunnable.h"
#include "nsICryptoHash.h"
#ifdef MOZ_PLACES
#include "nsIFaviconService.h"
#endif
#include "nsIDownloader.h"
#include "nsIURI.h"
#include "nsIWidget.h"
#include "nsIThread.h"

#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/UniquePtr.h"

/**
 * NS_INLINE_DECL_IUNKNOWN_REFCOUNTING should be used for defining and
 * implementing AddRef() and Release() of IUnknown interface.
 * This depends on xpcom/base/nsISupportsImpl.h.
 */

#define NS_INLINE_DECL_IUNKNOWN_REFCOUNTING(_class)                           \
public:                                                                       \
  STDMETHODIMP_(ULONG) AddRef()                                               \
  {                                                                           \
    MOZ_ASSERT_TYPE_OK_FOR_REFCOUNTING(_class)                                \
    MOZ_ASSERT(int32_t(mRefCnt) >= 0, "illegal refcnt");                      \
    NS_ASSERT_OWNINGTHREAD(_class);                                           \
    ++mRefCnt;                                                                \
    NS_LOG_ADDREF(this, mRefCnt, #_class, sizeof(*this));                     \
    return static_cast<ULONG>(mRefCnt.get());                                 \
  }                                                                           \
  STDMETHODIMP_(ULONG) Release()                                              \
  {                                                                           \
    MOZ_ASSERT(int32_t(mRefCnt) > 0,                                          \
      "Release called on object that has already been released!");            \
    NS_ASSERT_OWNINGTHREAD(_class);                                           \
    --mRefCnt;                                                                \
    NS_LOG_RELEASE(this, mRefCnt, #_class);                                   \
    if (mRefCnt == 0) {                                                       \
      NS_ASSERT_OWNINGTHREAD(_class);                                         \
      mRefCnt = 1; /* stabilize */                                            \
      delete this;                                                            \
      return 0;                                                               \
    }                                                                         \
    return static_cast<ULONG>(mRefCnt.get());                                 \
  }                                                                           \
protected:                                                                    \
  nsAutoRefCnt mRefCnt;                                                       \
  NS_DECL_OWNINGTHREAD                                                        \
public:

class nsWindow;
class nsWindowBase;
struct KeyPair;

#if !defined(DPI_AWARENESS_CONTEXT_DECLARED) && !defined(DPI_AWARENESS_CONTEXT_UNAWARE)

DECLARE_HANDLE(DPI_AWARENESS_CONTEXT);

typedef enum DPI_AWARENESS {
  DPI_AWARENESS_INVALID = -1,
  DPI_AWARENESS_UNAWARE = 0,
  DPI_AWARENESS_SYSTEM_AWARE = 1,
  DPI_AWARENESS_PER_MONITOR_AWARE = 2
} DPI_AWARENESS;

#define DPI_AWARENESS_CONTEXT_UNAWARE           ((DPI_AWARENESS_CONTEXT)-1)
#define DPI_AWARENESS_CONTEXT_SYSTEM_AWARE      ((DPI_AWARENESS_CONTEXT)-2)
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE ((DPI_AWARENESS_CONTEXT)-3)

#define DPI_AWARENESS_CONTEXT_DECLARED
#endif // (DPI_AWARENESS_CONTEXT_DECLARED)

#if WINVER < 0x0605
WINUSERAPI DPI_AWARENESS_CONTEXT WINAPI GetThreadDpiAwarenessContext();
WINUSERAPI BOOL WINAPI
AreDpiAwarenessContextsEqual(DPI_AWARENESS_CONTEXT, DPI_AWARENESS_CONTEXT);
#endif /* WINVER < 0x0605 */
typedef DPI_AWARENESS_CONTEXT(WINAPI * SetThreadDpiAwarenessContextProc)(DPI_AWARENESS_CONTEXT);
typedef BOOL(WINAPI * EnableNonClientDpiScalingProc)(HWND);

namespace mozilla {
#if defined(ACCESSIBILITY)
namespace a11y {
class Accessible;
} // namespace a11y
#endif // defined(ACCESSIBILITY)

namespace widget {

// Windows message debugging data
typedef struct {
  const char * mStr;
  UINT         mId;
} EventMsgInfo;
extern EventMsgInfo gAllEvents[];

// More complete QS definitions for MsgWaitForMultipleObjects() and
// GetQueueStatus() that include newer win8 specific defines.

#ifndef QS_RAWINPUT
#define QS_RAWINPUT 0x0400
#endif

#ifndef QS_TOUCH
#define QS_TOUCH    0x0800
#define QS_POINTER  0x1000
#endif

#define MOZ_QS_ALLEVENT (QS_KEY | QS_MOUSEMOVE | QS_MOUSEBUTTON | \
                         QS_POSTMESSAGE | QS_TIMER | QS_PAINT |   \
                         QS_SENDMESSAGE | QS_HOTKEY |             \
                         QS_ALLPOSTMESSAGE | QS_RAWINPUT |        \
                         QS_TOUCH | QS_POINTER)

// Logging macros
#define LogFunction() mozilla::widget::WinUtils::Log(__FUNCTION__)
#define LogThread() mozilla::widget::WinUtils::Log("%s: IsMainThread:%d ThreadId:%X", __FUNCTION__, NS_IsMainThread(), GetCurrentThreadId())
#define LogThis() mozilla::widget::WinUtils::Log("[%X] %s", this, __FUNCTION__)
#define LogException(e) mozilla::widget::WinUtils::Log("%s Exception:%s", __FUNCTION__, e->ToString()->Data())
#define LogHRESULT(hr) mozilla::widget::WinUtils::Log("%s hr=%X", __FUNCTION__, hr)

#ifdef MOZ_PLACES
class myDownloadObserver final : public nsIDownloadObserver
{
  ~myDownloadObserver() {}

public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIDOWNLOADOBSERVER
};
#endif

class WinUtils
{
  // Function pointers for APIs that may not be available depending on
  // the Win10 update version -- will be set up in Initialize().
  static SetThreadDpiAwarenessContextProc sSetThreadDpiAwarenessContext;
  static EnableNonClientDpiScalingProc sEnableNonClientDpiScaling;

  // Wrapper for DefWindowProc that will enable non-client dpi scaling on the
  // window during creation.
  static LRESULT WINAPI
  NonClientDpiScalingDefWindowProcW(HWND hWnd, UINT msg,
                                    WPARAM wParam, LPARAM lParam);

public:
  class AutoSystemDpiAware
  {
  public:
    AutoSystemDpiAware()
    {
      if (sSetThreadDpiAwarenessContext) {
        mPrevContext = sSetThreadDpiAwarenessContext(DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
      }
    }

    ~AutoSystemDpiAware()
    {
      if (sSetThreadDpiAwarenessContext) {
        sSetThreadDpiAwarenessContext(mPrevContext);
      }
    }

  private:
    DPI_AWARENESS_CONTEXT mPrevContext;
  };

  static decltype(::DefWindowProcW)* GetDefWindowProc()
  {
    return sEnableNonClientDpiScaling ? NonClientDpiScalingDefWindowProcW :
                                        ::DefWindowProcW;
  }

  /**
   * Get the system's default logical-to-physical DPI scaling factor,
   * which is based on the primary display. Note however that unlike
   * LogToPhysFactor(GetPrimaryMonitor()), this will not change during
   * a session even if the displays are reconfigured. This scale factor
   * is used by Windows theme metrics etc, which do not fully support
   * dynamic resolution changes but are only updated on logout.
   */
  static double SystemScaleFactor();

  static bool IsPerMonitorDPIAware();
  /**
   * Functions to convert between logical pixels as used by most Windows APIs
   * and physical (device) pixels.
   */
  static double LogToPhysFactor(HMONITOR aMonitor);
  static double LogToPhysFactor(HWND aWnd) {
    // if there's an ancestor window, we want to share its DPI setting
    HWND ancestor = ::GetAncestor(aWnd, GA_ROOTOWNER);
    return LogToPhysFactor(::MonitorFromWindow(ancestor ? ancestor : aWnd,
                                               MONITOR_DEFAULTTOPRIMARY));
  }
  static double LogToPhysFactor(HDC aDC) {
    return LogToPhysFactor(::WindowFromDC(aDC));
  }
  static int32_t LogToPhys(HMONITOR aMonitor, double aValue);
  static HMONITOR GetPrimaryMonitor();
  static HMONITOR MonitorFromRect(const gfx::Rect& rect);

  /**
   * Logging helpers that dump output to prlog module 'Widget', console, and
   * OutputDebugString. Note these output in both debug and release builds.
   */
  static void Log(const char *fmt, ...);
  static void LogW(const wchar_t *fmt, ...);

  /**
   * PeekMessage() and GetMessage() are wrapper methods for PeekMessageW(),
   * GetMessageW(), ITfMessageMgr::PeekMessageW() and
   * ITfMessageMgr::GetMessageW().
   * Don't call the native APIs directly.  You MUST use these methods instead.
   */
  static bool PeekMessage(LPMSG aMsg, HWND aWnd, UINT aFirstMessage,
                          UINT aLastMessage, UINT aOption);
  static bool GetMessage(LPMSG aMsg, HWND aWnd, UINT aFirstMessage,
                         UINT aLastMessage);

  /**
   * Wait until a message is ready to be processed.
   * Prefer using this method to directly calling ::WaitMessage since
   * ::WaitMessage will wait if there is an unread message in the queue.
   * That can cause freezes until another message enters the queue if the
   * message is marked read by a call to PeekMessage which the caller is
   * not aware of (e.g., from a different thread).
   * Note that this method may cause sync dispatch of sent (as opposed to
   * posted) messages.
   * @param aTimeoutMs Timeout for waiting in ms, defaults to INFINITE
   */
  static void WaitForMessage(DWORD aTimeoutMs = INFINITE);

  /**
   * Gets the value of a string-typed registry value.
   *
   * @param aRoot The registry root to search in.
   * @param aKeyName The name of the registry key to open.
   * @param aValueName The name of the registry value in the specified key whose
   *   value is to be retrieved.  Can be null, to retrieve the key's unnamed/
   *   default value.
   * @param aBuffer The buffer into which to store the string value.  Can be
   *   null, in which case the return value indicates just whether the value
   *   exists.
   * @param aBufferLength The size of aBuffer, in bytes.
   * @return Whether the value exists and is a string.
   */
  static bool GetRegistryKey(HKEY aRoot,
                             char16ptr_t aKeyName,
                             char16ptr_t aValueName,
                             wchar_t* aBuffer,
                             DWORD aBufferLength);

  /**
   * Checks whether the registry key exists in either 32bit or 64bit branch on
   * the environment.
   *
   * @param aRoot The registry root of aName.
   * @param aKeyName The name of the registry key to check.
   * @return TRUE if it exists and is readable.  Otherwise, FALSE.
   */
  static bool HasRegistryKey(HKEY aRoot,
                             char16ptr_t aKeyName);

  /**
   * GetTopLevelHWND() returns a window handle of the top level window which
   * aWnd belongs to.  Note that the result may not be our window, i.e., it
   * may not be managed by nsWindow.
   *
   * See follwing table for the detail of the result window type.
   *
   * +-------------------------+-----------------------------------------------+
   * |                         |                aStopIfNotPopup                |
   * +-------------------------+-----------------------+-----------------------+
   * |                         |         TRUE          |         FALSE         |
   + +-----------------+-------+-----------------------+-----------------------+
   * |                 |       |  * an independent top level window            |
   * |                 | TRUE  |  * a pupup window (WS_POPUP)                  |
   * |                 |       |  * an owned top level window (like dialog)    |
   * | aStopIfNotChild +-------+-----------------------+-----------------------+
   * |                 |       |  * independent window | * only an independent |
   * |                 | FALSE |  * non-popup-owned-   |   top level window    |
   * |                 |       |    window like dialog |                       |
   * +-----------------+-------+-----------------------+-----------------------+
   */
  static HWND GetTopLevelHWND(HWND aWnd,
                              bool aStopIfNotChild = false,
                              bool aStopIfNotPopup = true);

  /**
   * SetNSWindowBasePtr() associates an nsWindowBase to aWnd.  If aWidget is
   * nullptr, it dissociate any nsBaseWidget pointer from aWnd.
   * GetNSWindowBasePtr() returns an nsWindowBase pointer which was associated by
   * SetNSWindowBasePtr().
   * GetNSWindowPtr() is a legacy api for win32 nsWindow and should be avoided
   * outside of nsWindow src.
   */
  static bool SetNSWindowBasePtr(HWND aWnd, nsWindowBase* aWidget);
  static nsWindowBase* GetNSWindowBasePtr(HWND aWnd);
  static nsWindow* GetNSWindowPtr(HWND aWnd);

  /**
   * GetMonitorCount() returns count of monitors on the environment.
   */
  static int32_t GetMonitorCount();

  /**
   * IsOurProcessWindow() returns TRUE if aWnd belongs our process.
   * Otherwise, FALSE.
   */
  static bool IsOurProcessWindow(HWND aWnd);

  /**
   * FindOurProcessWindow() returns the nearest ancestor window which
   * belongs to our process.  If it fails to find our process's window by the
   * top level window, returns nullptr.  And note that this is using
   * ::GetParent() for climbing the window hierarchy, therefore, it gives
   * up at an owned top level window except popup window (e.g., dialog).
   */
  static HWND FindOurProcessWindow(HWND aWnd);

  /**
   * FindOurWindowAtPoint() returns the topmost child window which belongs to
   * our process's top level window.
   *
   * NOTE: the topmost child window may NOT be our process's window like a
   *       plugin's window.
   */
  static HWND FindOurWindowAtPoint(const POINT& aPointInScreen);

  /**
   * InitMSG() returns an MSG struct which was initialized by the params.
   * Don't trust the other members in the result.
   */
  static MSG InitMSG(UINT aMessage, WPARAM wParam, LPARAM lParam, HWND aWnd);

  /**
   * GetScanCode() returns a scan code for the LPARAM of WM_KEYDOWN, WM_KEYUP,
   * WM_CHAR and WM_UNICHAR.
   *
   */
  static WORD GetScanCode(LPARAM aLParam)
  {
    return (aLParam >> 16) & 0xFF;
  }

  /**
   * IsExtendedScanCode() returns TRUE if the LPARAM indicates the key message
   * is an extended key event.
   */
  static bool IsExtendedScanCode(LPARAM aLParam)
  {
    return (aLParam & 0x1000000) != 0;
  }

  /**
   * GetInternalMessage() converts a native message to an internal message.
   * If there is no internal message for the given native message, returns
   * the native message itself.
   */
  static UINT GetInternalMessage(UINT aNativeMessage);

  /**
   * GetNativeMessage() converts an internal message to a native message.
   * If aInternalMessage is a native message, returns the native message itself.
   */
  static UINT GetNativeMessage(UINT aInternalMessage);

  /**
   * GetMouseInputSource() returns a pointing device information.  The value is
   * one of nsIDOMMouseEvent::MOZ_SOURCE_*.  This method MUST be called during
   * mouse message handling.
   */
  static uint16_t GetMouseInputSource();

  /**
   * Windows also fires mouse window messages for pens and touches, so we should
   * retrieve their pointer ID on receiving mouse events as well. Please refer to
   * https://msdn.microsoft.com/en-us/library/windows/desktop/ms703320(v=vs.85).aspx
   */
  static uint16_t GetMousePointerID();

  static bool GetIsMouseFromTouch(EventMessage aEventType);

  /**
   * GetShellItemPath return the file or directory path of a shell item.
   * Internally calls IShellItem's GetDisplayName.
   *
   * aItem  the shell item containing the path.
   * aResultString  the resulting string path.
   * returns  true if a path was retreived.
   */
  static bool GetShellItemPath(IShellItem* aItem,
                               nsString& aResultString);

  /**
   * ConvertHRGNToRegion converts a Windows HRGN to an nsIntRegion.
   *
   * aRgn the HRGN to convert.
   * returns the nsIntRegion.
   */
  static nsIntRegion ConvertHRGNToRegion(HRGN aRgn);

  /**
   * ToIntRect converts a Windows RECT to a nsIntRect.
   *
   * aRect the RECT to convert.
   * returns the nsIntRect.
   */
  static nsIntRect ToIntRect(const RECT& aRect);

  /**
   * Helper used in invalidating flash plugin windows owned
   * by low rights flash containers.
   */
  static void InvalidatePluginAsWorkaround(nsIWidget* aWidget,
                                           const LayoutDeviceIntRect& aRect);

  /**
   * Returns true if the context or IME state is enabled.  Otherwise, false.
   */
  static bool IsIMEEnabled(const InputContext& aInputContext);
  static bool IsIMEEnabled(IMEState::Enabled aIMEState);

  /**
   * Returns modifier key array for aModifiers.  This is for
   * nsIWidget::SynthethizeNative*Event().
   */
  static void SetupKeyModifiersSequence(nsTArray<KeyPair>* aArray,
                                        uint32_t aModifiers);

  /**
  * Does device have touch support
  */
  static uint32_t IsTouchDeviceSupportPresent();

  /**
  * The maximum number of simultaneous touch contacts supported by the device.
  * In the case of devices with multiple digitizers (e.g. multiple touch screens),
  * the value will be the maximum of the set of maximum supported contacts by
  * each individual digitizer.
  */
  static uint32_t GetMaxTouchPoints();

  /**
   * Fully resolves a path to its final path name. So if path contains
   * junction points or symlinks to other folders, we'll resolve the path
   * fully to the actual path that the links target.
   *
   * @param aPath path to be resolved.
   * @return true if successful, including if nothing needs to be changed.
   *         false if something failed or aPath does not exist, aPath will
   *               remain unchanged.
   */
  static bool ResolveJunctionPointsAndSymLinks(std::wstring& aPath);

  static void Initialize();

  static bool ShouldHideScrollbars();

  /**
   * This function normalizes the input path, converts short filenames to long
   * filenames, and substitutes environment variables for system paths.
   * The resulting output string length is guaranteed to be <= MAX_PATH.
   */
  static bool SanitizePath(const wchar_t* aInputPath, nsAString& aOutput);

  /**
   * Retrieve a semicolon-delimited list of DLL files derived from AppInit_DLLs
   */
  static bool GetAppInitDLLs(nsAString& aOutput);

#ifdef ACCESSIBILITY
  static void SetAPCPending();

  static a11y::Accessible* GetRootAccessibleForHWND(HWND aHwnd);
#endif

private:
  static void GetWhitelistedPaths(
      nsTArray<mozilla::Pair<nsString,nsDependentString>>& aOutput);
};

#ifdef MOZ_PLACES
class AsyncFaviconDataReady final : public nsIFaviconDataCallback
{
public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIFAVICONDATACALLBACK

  AsyncFaviconDataReady(nsIURI *aNewURI,
                        nsCOMPtr<nsIThread> &aIOThread,
                        const bool aURLShortcut);
  nsresult OnFaviconDataNotAvailable(void);
private:
  ~AsyncFaviconDataReady() {}

  nsCOMPtr<nsIURI> mNewURI;
  nsCOMPtr<nsIThread> mIOThread;
  const bool mURLShortcut;
};
#endif

/**
  * Asynchronously tries add the list to the build
  */
class AsyncEncodeAndWriteIcon : public nsIRunnable
{
public:
  const bool mURLShortcut;
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIRUNNABLE

  // Warning: AsyncEncodeAndWriteIcon assumes ownership of the aData buffer passed in
  AsyncEncodeAndWriteIcon(const nsAString &aIconPath,
                          UniquePtr<uint8_t[]> aData,
                          uint32_t aStride, uint32_t aWidth, uint32_t aHeight,
                          const bool aURLShortcut);

private:
  virtual ~AsyncEncodeAndWriteIcon();

  nsAutoString mIconPath;
  UniquePtr<uint8_t[]> mBuffer;
  uint32_t mStride;
  uint32_t mWidth;
  uint32_t mHeight;
};


class AsyncDeleteIconFromDisk : public nsIRunnable
{
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIRUNNABLE

  explicit AsyncDeleteIconFromDisk(const nsAString &aIconPath);

private:
  virtual ~AsyncDeleteIconFromDisk();

  nsAutoString mIconPath;
};

class AsyncDeleteAllFaviconsFromDisk : public nsIRunnable
{
public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIRUNNABLE

  explicit AsyncDeleteAllFaviconsFromDisk(bool aIgnoreRecent = false);

private:
  virtual ~AsyncDeleteAllFaviconsFromDisk();

  int32_t mIcoNoDeleteSeconds;
  bool mIgnoreRecent;
  nsCOMPtr<nsIFile> mJumpListCacheDir;
};

class FaviconHelper
{
public:
  static const char kJumpListCacheDir[];
  static const char kShortcutCacheDir[];
  static nsresult ObtainCachedIconFile(nsCOMPtr<nsIURI> aFaviconPageURI,
                                       nsString &aICOFilePath,
                                       nsCOMPtr<nsIThread> &aIOThread,
                                       bool aURLShortcut);

  static nsresult HashURI(nsCOMPtr<nsICryptoHash> &aCryptoHash,
                          nsIURI *aUri,
                          nsACString& aUriHash);

  static nsresult GetOutputIconPath(nsCOMPtr<nsIURI> aFaviconPageURI,
                                    nsCOMPtr<nsIFile> &aICOFile,
                                    bool aURLShortcut);

  static nsresult
  CacheIconFileFromFaviconURIAsync(nsCOMPtr<nsIURI> aFaviconPageURI,
                                   nsCOMPtr<nsIFile> aICOFile,
                                   nsCOMPtr<nsIThread> &aIOThread,
                                   bool aURLShortcut);

  static int32_t GetICOCacheSecondsTimeout();
};

} // namespace widget
} // namespace mozilla

#endif // mozilla_widget_WinUtils_h__