# -*- coding: utf-8 -*-

import ctypes
import _winreg
import struct
import sys

import pywintypes
import win32api
import win32con
import win32process
import winerror
from win32com.shell import shell as win32com_shell

from ctypes import POINTER, byref, sizeof, windll
from ctypes.wintypes import HANDLE, DWORD, LPWSTR

from util_os import quote_args

if not hasattr(ctypes, "c_bool"):
	# Python 2.5
	ctypes.c_bool = ctypes.c_int

if sys.getwindowsversion() >= (6, ):
	LPDWORD = POINTER(DWORD)
	PROCESS_QUERY_LIMITED_INFORMATION = 0x1000
	kernel32 = windll.kernel32
	QueryFullProcessImageNameW = kernel32.QueryFullProcessImageNameW
	QueryFullProcessImageNameW.argtypes = [HANDLE, DWORD, LPWSTR, LPDWORD]
	QueryFullProcessImageNameW.restype  = bool

try:
	psapi = ctypes.windll.psapi
except WindowsError:
	psapi = None


# DISPLAY_DEVICE structure, StateFlags member
# http://msdn.microsoft.com/en-us/library/dd183569%28v=vs.85%29.aspx

# wingdi.h

# Flags for parent devices
DISPLAY_DEVICE_ATTACHED_TO_DESKTOP = 0x1
DISPLAY_DEVICE_MIRRORING_DRIVER = 0x8  # Represents a pseudo device used to mirror application drawing for remoting or other purposes. 
									   # An invisible pseudo monitor is associated with this device. 
									   # For example, NetMeeting uses it. Note that GetSystemMetrics (SM_MONITORS) only accounts for visible display monitors.
DISPLAY_DEVICE_MODESPRUNED = 0x8000000  # The device has more display modes than its output devices support.
DISPLAY_DEVICE_PRIMARY_DEVICE = 0x4  # The primary desktop is on the device. 
									 # For a system with a single display card, this is always set. 
									 # For a system with multiple display cards, only one device can have this set.
DISPLAY_DEVICE_REMOVABLE = 0x20  # The device is removable; it cannot be the primary display.
DISPLAY_DEVICE_VGA_COMPATIBLE = 0x10  # The device is VGA compatible.
DISPLAY_DEVICE_DISCONNECT = 0x2000000
DISPLAY_DEVICE_MULTI_DRIVER = 0x2
DISPLAY_DEVICE_REMOTE = 0x4000000

# Flags for child devices
DISPLAY_DEVICE_ACTIVE = 0x1  # DISPLAY_DEVICE_ACTIVE specifies whether a monitor is presented as being "on" by the respective GDI view.
							 # Windows Vista: EnumDisplayDevices will only enumerate monitors that can be presented as being "on."
DISPLAY_DEVICE_ATTACHED = 0x2


# MONITORINFO structure, dwFlags member
# https://msdn.microsoft.com/de-de/library/windows/desktop/dd145065(v=vs.85).aspx
MONITORINFOF_PRIMARY = 0x1

# Icm.h
CLASS_MONITOR = struct.unpack("!L", "mntr")[0]
CLASS_PRINTER = struct.unpack("!L", "prtr")[0]
CLASS_SCANNER = struct.unpack("!L", "scnr")[0]

# ShellExecute
SEE_MASK_FLAG_NO_UI = 0x00000400
SEE_MASK_NOASYNC = 0x00000100
SEE_MASK_NOCLOSEPROCESS = 0x00000040
SEE_MASK_WAITFORINPUTIDLE = 0x02000000


def _get_icm_display_device_key(devicekey):
	monkey = devicekey.split("\\")[-2:]  # pun totally intended
	subkey = "\\".join(["Software", "Microsoft", "Windows NT", 
						"CurrentVersion", "ICM", "ProfileAssociations", 
						"Display"] + monkey)
	return _winreg.CreateKey(_winreg.HKEY_CURRENT_USER, subkey)


def _get_mscms_dll_handle():
	try:
		return ctypes.windll.mscms
	except WindowsError:
		return None


def calibration_management_isenabled():
	""" Check if calibration is enabled under Windows 7 """
	if sys.getwindowsversion() < (6, 1):
		# Windows XP and Vista don't have calibration management
		return False
	if False:
		# Using registry - NEVER
		# Also, does not work!
		key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,
							  r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\ICM\Calibration")
		return bool(_winreg.QueryValueEx(key, "CalibrationManagementEnabled")[0])
	else:
		# Using ctypes
		mscms = _get_mscms_dll_handle()
		pbool = ctypes.pointer(ctypes.c_bool())
		if not mscms or not mscms.WcsGetCalibrationManagementState(pbool):
			return
		return bool(pbool.contents)


def disable_calibration_management():
	""" Disable calibration loading under Windows 7 """
	enable_calibration_management(False)


def disable_per_user_profiles(display_no=0):
	""" Disable per user profiles under Vista/Windows 7 """
	enable_per_user_profiles(False, display_no)


def enable_calibration_management(enable=True):
	""" Enable calibration loading under Windows 7 """
	if sys.getwindowsversion() < (6, 1):
		raise NotImplementedError("Calibration Management is only available "
								  "in Windows 7 or later")
	if False:
		# Using registry - NEVER
		# Also, does not work!
		key = _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE,
							  r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\ICM\Calibration",
							  _winreg.KEY_SET_VALUE)
		_winreg.SetValueEx(key, "CalibrationManagementEnabled", 0,
						   _winreg.REG_DWORD, int(enable))
	else:
		# Using ctypes (must be called with elevated permissions)
		mscms = _get_mscms_dll_handle()
		if not mscms:
			return False
		if not mscms.WcsSetCalibrationManagementState(enable):
			raise get_windows_error(ctypes.windll.kernel32.GetLastError())
		return True


def enable_per_user_profiles(enable=True, display_no=0, devicekey=None):
	""" Enable per user profiles under Vista/Windows 7 """
	if sys.getwindowsversion() < (6, ):
		# Windows XP doesn't have per-user profiles
		raise NotImplementedError("Per-user profiles are only available "
								  "in Windows Vista, 7 or later")
	if not devicekey:
		device = get_display_device(display_no)
		if device:
			devicekey = device.DeviceKey
	if devicekey:
		if False:
			# Using registry - NEVER
			key = _get_icm_display_device_key(devicekey)
			_winreg.SetValueEx(key, "UsePerUserProfiles", 0,
							   _winreg.REG_DWORD, int(enable))
		else:
			# Using ctypes
			mscms = _get_mscms_dll_handle()
			if not mscms:
				return False
			if not mscms.WcsSetUsePerUserProfiles(unicode(devicekey),
																CLASS_MONITOR,
																enable):
				raise get_windows_error(ctypes.windll.kernel32.GetLastError())
		return True


def get_display_devices(devicename):
	"""
	Get all display devices of an output (there can be several)
	
	Return value: list of display devices
	
	Example usage:
	get_display_devices('\\\\.\\DISPLAY1')
	devicename = '\\\\.\\DISPLAYn' where n is a positive integer starting at 1
	
	"""
	devices = []
	n = 0
	while True:
		try:
			devices.append(win32api.EnumDisplayDevices(devicename, n))
		except pywintypes.error:
			break
		n += 1
	return devices


def get_first_display_device(devicename, exception_cls=pywintypes.error):
	"""
	Get the first display of device <devicename>.
	
	"""
	try:
		return win32api.EnumDisplayDevices(devicename, 0)
	except exception_cls:
		pass
	

def get_active_display_device(devicename, devices=None):
	"""
	Get active display device of an output (there can only be one per output)
	
	Return value: display device object or None
	
	Example usage:
	get_active_display_device('\\\\.\\DISPLAY1')
	devicename = '\\\\.\\DISPLAYn' where n is a positive integer starting at 1
	
	"""
	if not devices:
		devices = get_display_devices(devicename)
	for device in devices:
		if (device.StateFlags & DISPLAY_DEVICE_ACTIVE 
			and (len(devices) == 1 or device.StateFlags & 
									  DISPLAY_DEVICE_ATTACHED)):
			return device


def get_display_device(display_no=0, use_active_display_device=False,
					   exception_cls=pywintypes.error):
	# The ordering will work as long as Argyll continues using
	# EnumDisplayMonitors
	monitors = get_real_display_devices_info()
	moninfo = monitors[display_no]
	if use_active_display_device:
		return get_active_display_device(moninfo["Device"])
	else:
		return get_first_display_device(moninfo["Device"], exception_cls)


def get_process_filename(pid, handle=0):
	if sys.getwindowsversion() >= (6, ):
		flags = PROCESS_QUERY_LIMITED_INFORMATION
	else:
		flags = win32con.PROCESS_QUERY_INFORMATION |  win32con.PROCESS_VM_READ
	if not handle:
		handle = win32api.OpenProcess(flags, False, pid)
	try:
		if sys.getwindowsversion() >= (6, ):
			dwSize = win32con.MAX_PATH
			while True:
				dwFlags = 0  # The name should use the Win32 path format
				lpdwSize = DWORD(dwSize)
				lpExeName = ctypes.create_unicode_buffer("", lpdwSize.value + 1)
				success = QueryFullProcessImageNameW(int(handle), dwFlags,
													 lpExeName, byref(lpdwSize))
				if success and 0 < lpdwSize.value < dwSize:
					break
				error = kernel32.GetLastError()
				if error != winerror.ERROR_INSUFFICIENT_BUFFER:
					raise ctypes.WinError(error)
				dwSize = dwSize + 256
				if dwSize > 0x1000:
					# This prevents an infinite loop under Windows Server 2008
					# if the path contains spaces, see
					# http://msdn.microsoft.com/en-us/library/ms684919(VS.85).aspx#4
					raise ctypes.WinError(error)
			filename = lpExeName.value
		else:
			filename = win32process.GetModuleFileNameEx(handle, 0)
	finally:
		win32api.CloseHandle(handle)
	return filename


def get_file_info(filename):
	""" Get exe/dll file information """
	info = {"FileInfo": None, "StringFileInfo": {}, "FileVersion": None}

	finfo = win32api.GetFileVersionInfo(filename, "\\")
	info["FileInfo"] = finfo
	info["FileVersion"] = "%i.%i.%i.%i" % (finfo["FileVersionMS"] / 65536,
										   finfo["FileVersionMS"] % 65536,
										   finfo["FileVersionLS"] / 65536,
										   finfo["FileVersionLS"] % 65536)
	for lcid, codepage in win32api.GetFileVersionInfo(filename,
													  "\\VarFileInfo\\Translation"):
		info["StringFileInfo"][lcid, codepage] = {}
		for name in ["Comments", "CompanyName", "FileDescription",
					 "FileVersion", "InternalName", "LegalCopyright",
					 "LegalTrademarks", "OriginalFilename", "PrivateBuild",
					 "ProductName", "ProductVersion", "SpecialBuild"]:
			value = win32api.GetFileVersionInfo(filename,
												u"\\StringFileInfo\\%04X%04X\\%s" %
												(lcid, codepage, name))
			if value is not None:
				info["StringFileInfo"][lcid, codepage][name] = value

	return info


def get_pids():
	""" Get PIDs of all running processes """
	pids_count = 1024
	while True:
		pids = (DWORD * pids_count)()
		pids_size = sizeof(pids)
		bytes = DWORD()
		if not psapi.EnumProcesses(byref(pids), pids_size, byref(bytes)):
			raise get_windows_error(ctypes.windll.kernel32.GetLastError())
		if bytes.value >= pids_size:
			pids_count *= 2
			continue
		count = bytes.value / (pids_size / pids_count)
		return filter(None, pids[:count])


def get_real_display_devices_info():
	""" Return info for real (non-virtual) devices """
	# See Argyll source spectro/dispwin.c MonitorEnumProc, get_displays
	monitors = []
	for monitor in win32api.EnumDisplayMonitors(None, None):
		try:
			moninfo = win32api.GetMonitorInfo(monitor[0])
		except pywintypes.error:
			pass
		else:
			if moninfo and not moninfo["Device"].startswith("\\\\.\\DISPLAYV"):
				monitors.append(moninfo)
	return monitors


def get_windows_error(errorcode):
	return ctypes.WinError(errorcode)


def per_user_profiles_isenabled(display_no=0, devicekey=None):
	""" Check if per user profiles is enabled under Vista/Windows 7 """
	if sys.getwindowsversion() < (6, ):
		# Windows XP doesn't have per-user profiles
		return False
	if not devicekey:
		device = get_display_device(display_no)
		if device:
			devicekey = device.DeviceKey
	if devicekey:
		if False:
			# Using registry - NEVER
			key = _get_icm_display_device_key(devicekey)
			return bool(_winreg.QueryValueEx(key, "UsePerUserProfiles")[0])
		else:
			# Using ctypes
			mscms = _get_mscms_dll_handle()
			pbool = ctypes.pointer(ctypes.c_bool())
			if not mscms or not mscms.WcsGetUsePerUserProfiles(unicode(devicekey),
																CLASS_MONITOR,
																pbool):
				return
			return bool(pbool.contents)


def run_as_admin(cmd, args, close_process=True, async=False,
				 wait_for_idle=False, show=True):
	"""
	Run command with elevated privileges.
	
	This is a wrapper around ShellExecuteEx.
	
	Returns a dictionary with hInstApp and hProcess members.
	
	"""
	return shell_exec(cmd, args, "runas", close_process, async, wait_for_idle,
					  show)


def shell_exec(filename, args, operation="open", close_process=True,
			   async=False, wait_for_idle=False, show=True):
	"""
	Run command.
	
	This is a wrapper around ShellExecuteEx.
	
	Returns a dictionary with hInstApp and hProcess members.
	
	"""
	flags = SEE_MASK_FLAG_NO_UI
	if not close_process:
		flags |= SEE_MASK_NOCLOSEPROCESS
	if not async:
		flags |= SEE_MASK_NOASYNC
	if wait_for_idle:
		flags |= SEE_MASK_WAITFORINPUTIDLE
	params = " ".join(quote_args(args))
	if show:
		show = win32con.SW_SHOWNORMAL
	else:
		show = win32con.SW_HIDE
	return win32com_shell.ShellExecuteEx(fMask=flags,
										 lpVerb=operation,
										 lpFile=filename,
										 lpParameters=params,
										 nShow=show)


def win_ver():
	""" Get Windows version info """
	csd = sys.getwindowsversion()[-1]
	# Use the registry to get product name, e.g. 'Windows 7 Ultimate'.
	# Not recommended, but we don't care.
	pname = "Windows"
	key = None
	try:
		key = _winreg.OpenKeyEx(_winreg.HKEY_LOCAL_MACHINE,
								r"SOFTWARE\Microsoft\Windows NT\CurrentVersion")
		pname = _winreg.QueryValueEx(key, "ProductName")[0]
	except Exception, e:
		pass
	finally:
		if key:
			_winreg.CloseKey(key)
	return pname, csd


if __name__ == "__main__":
	if "calibration" in sys.argv[1:]:
		if "enable" in sys.argv[1:] or "disable" in sys.argv[1:]:
			enable_calibration_management(sys.argv[1:][-1] != "disable")
		print calibration_management_isenabled()
	elif "per_user_profiles" in sys.argv[1:]:
		if "enable" in sys.argv[1:] or "disable" in sys.argv[1:]:
			enable_per_user_profiles(sys.argv[1:][-1] != "disable")
		print per_user_profiles_isenabled()
