# App.py
# Application stuff.
# The application is responsible for managing the main frame window.
#
# We also grab the FileOpen command, to invoke our Python editor
" The PythonWin application code. Manages most aspects of MDI, etc "
import win32con
import win32api
import win32ui
import sys
import string
import os
from pywin.mfc import window, dialog, afxres
from pywin.mfc.thread import WinApp
import traceback
import regutil

from . import scriptutils

## NOTE: App and AppBuild should NOT be used - instead, you should contruct your
## APP class manually whenever you like (just ensure you leave these 2 params None!)
## Whoever wants the generic "Application" should get it via win32iu.GetApp()

# These are "legacy"
AppBuilder = None 
App = None	# default - if used, must end up a CApp derived class. 

# Helpers that should one day be removed!
def AddIdleHandler(handler):
	print("app.AddIdleHandler is deprecated - please use win32ui.GetApp().AddIdleHandler() instead.")
	return win32ui.GetApp().AddIdleHandler(handler)
def DeleteIdleHandler(handler):
	print("app.DeleteIdleHandler is deprecated - please use win32ui.GetApp().DeleteIdleHandler() instead.")
	return win32ui.GetApp().DeleteIdleHandler(handler)

# Helper for writing a Window position by name, and later loading it.
def SaveWindowSize(section,rect,state=""):
	""" Writes a rectangle to an INI file
	Args: section = section name in the applications INI file
	      rect = a rectangle in a (cy, cx, y, x) tuple 
	             (same format as CREATESTRUCT position tuples)."""	
	left, top, right, bottom = rect
	if state: state = state + " "
	win32ui.WriteProfileVal(section,state+"left",left)
	win32ui.WriteProfileVal(section,state+"top",top)
	win32ui.WriteProfileVal(section,state+"right",right)
	win32ui.WriteProfileVal(section,state+"bottom",bottom)

def LoadWindowSize(section, state=""):
	""" Loads a section from an INI file, and returns a rect in a tuple (see SaveWindowSize)"""
	if state: state = state + " "
	left = win32ui.GetProfileVal(section,state+"left",0)
	top = win32ui.GetProfileVal(section,state+"top",0)
	right = win32ui.GetProfileVal(section,state+"right",0)
	bottom = win32ui.GetProfileVal(section,state+"bottom",0)
	return (left, top, right, bottom)

def RectToCreateStructRect(rect):
	return (rect[3]-rect[1], rect[2]-rect[0], rect[1], rect[0] )


# Define FrameWindow and Application objects
#
# The Main Frame of the application.
class MainFrame(window.MDIFrameWnd):
	sectionPos = "Main Window"
	statusBarIndicators = ( afxres.ID_SEPARATOR, #// status line indicator
	                        afxres.ID_INDICATOR_CAPS,
	                        afxres.ID_INDICATOR_NUM,
	                        afxres.ID_INDICATOR_SCRL,
	                        win32ui.ID_INDICATOR_LINENUM,
	                        win32ui.ID_INDICATOR_COLNUM )

	def OnCreate(self, cs):
		self._CreateStatusBar()
		return 0

	def _CreateStatusBar(self):
		self.statusBar = win32ui.CreateStatusBar(self)
		self.statusBar.SetIndicators(self.statusBarIndicators)
		self.HookCommandUpdate(self.OnUpdatePosIndicator, win32ui.ID_INDICATOR_LINENUM)
		self.HookCommandUpdate(self.OnUpdatePosIndicator, win32ui.ID_INDICATOR_COLNUM)

	def OnUpdatePosIndicator(self, cmdui):
		editControl = scriptutils.GetActiveEditControl()
		value = " " * 5
		if editControl is not None:
			try:
				startChar, endChar = editControl.GetSel()
				lineNo = editControl.LineFromChar(startChar)
				colNo = endChar - editControl.LineIndex(lineNo)

				if cmdui.m_nID==win32ui.ID_INDICATOR_LINENUM:
					value = "%0*d" % (5, lineNo + 1)
				else:
					value = "%0*d" % (3, colNo + 1)
			except win32ui.error:
				pass
		cmdui.SetText(value)
		cmdui.Enable()

	def PreCreateWindow(self, cc):
		cc = self._obj_.PreCreateWindow(cc)
		pos = LoadWindowSize(self.sectionPos)
		self.startRect = pos
		if pos[2] - pos[0]:
			rect = RectToCreateStructRect(pos)
			cc = cc[0], cc[1], cc[2], cc[3], rect, cc[5], cc[6], cc[7], cc[8]
		return cc

	def OnDestroy(self, msg):
		# use GetWindowPlacement(), as it works even when min'd or max'd
		rectNow = self.GetWindowPlacement()[4]
		if rectNow != self.startRect:
			SaveWindowSize(self.sectionPos, rectNow)
		return 0

class CApp(WinApp):
	" A class for the application "
	def __init__(self):
		self.oldCallbackCaller = None
		WinApp.__init__(self, win32ui.GetApp() )
		self.idleHandlers = []
		
	def InitInstance(self):
		" Called to crank up the app "
		HookInput()
		numMRU = win32ui.GetProfileVal("Settings","Recent File List Size", 10)
		win32ui.LoadStdProfileSettings(numMRU)
#		self._obj_.InitMDIInstance()
		if win32api.GetVersionEx()[0]<4:
			win32ui.SetDialogBkColor()
			win32ui.Enable3dControls()

		# install a "callback caller" - a manager for the callbacks
#		self.oldCallbackCaller = win32ui.InstallCallbackCaller(self.CallbackManager)
		self.LoadMainFrame()
		self.SetApplicationPaths()

	def ExitInstance(self):
		" Called as the app dies - too late to prevent it here! "
		win32ui.OutputDebug("Application shutdown\n")
		# Restore the callback manager, if any.
		try:
			win32ui.InstallCallbackCaller(self.oldCallbackCaller)
		except AttributeError:
			pass
		if self.oldCallbackCaller:
			del self.oldCallbackCaller
		self.frame=None	# clean Python references to the now destroyed window object.
		self.idleHandlers = []
		# Attempt cleanup if not already done!
		if self._obj_: self._obj_.AttachObject(None)
		self._obj_ = None
		global App
		global AppBuilder
		App = None
		AppBuilder = None
		return 0

	def HaveIdleHandler(self, handler):
		return handler in self.idleHandlers
	def AddIdleHandler(self, handler):
		self.idleHandlers.append(handler)
	def DeleteIdleHandler(self, handler):
		self.idleHandlers.remove(handler)
	def OnIdle(self, count):
		try:
			ret = 0
			handlers = self.idleHandlers[:] # copy list, as may be modified during loop
			for handler in handlers:
				try:
					thisRet = handler(handler, count)
				except:
					print("Idle handler %s failed" % (repr(handler)))
					traceback.print_exc()
					print("Idle handler removed from list")
					try:
						self.DeleteIdleHandler(handler)
					except ValueError: # Item not in list.
						pass
					thisRet = 0
				ret = ret or thisRet
			return ret
		except KeyboardInterrupt:
			pass
	def CreateMainFrame(self):
		return MainFrame()

	def LoadMainFrame(self):
		" Create the main applications frame "
		self.frame = self.CreateMainFrame()
		self.SetMainFrame(self.frame)
		self.frame.LoadFrame(win32ui.IDR_MAINFRAME, win32con.WS_OVERLAPPEDWINDOW)
		self.frame.DragAcceptFiles()	# we can accept these.
		self.frame.ShowWindow(win32ui.GetInitialStateRequest())
		self.frame.UpdateWindow()
		self.HookCommands()

	def OnHelp(self,id, code):
		try:
			if id==win32ui.ID_HELP_GUI_REF:
				helpFile = regutil.GetRegisteredHelpFile("Pythonwin Reference")
				helpCmd = win32con.HELP_CONTENTS
			else:
				helpFile = regutil.GetRegisteredHelpFile("Main Python Documentation")
				helpCmd = win32con.HELP_FINDER
			if helpFile is None:
				win32ui.MessageBox("The help file is not registered!")
			else:
				from . import help
				help.OpenHelpFile(helpFile, helpCmd)
		except:
			t, v, tb = sys.exc_info()
			win32ui.MessageBox("Internal error in help file processing\r\n%s: %s" % (t,v))
			tb = None # Prevent a cycle
	
	def DoLoadModules(self, modules):
		# XXX - this should go, but the debugger uses it :-(
		# dont do much checking!
		for module in modules:
			__import__(module)

	def HookCommands(self):
		self.frame.HookMessage(self.OnDropFiles,win32con.WM_DROPFILES)
		self.HookCommand(self.HandleOnFileOpen,win32ui.ID_FILE_OPEN)
		self.HookCommand(self.HandleOnFileNew,win32ui.ID_FILE_NEW)
		self.HookCommand(self.OnFileMRU,win32ui.ID_FILE_MRU_FILE1)
		self.HookCommand(self.OnHelpAbout,win32ui.ID_APP_ABOUT)
		self.HookCommand(self.OnHelp, win32ui.ID_HELP_PYTHON)
		self.HookCommand(self.OnHelp, win32ui.ID_HELP_GUI_REF)
		# Hook for the right-click menu.
		self.frame.GetWindow(win32con.GW_CHILD).HookMessage(self.OnRClick,win32con.WM_RBUTTONDOWN)

	def SetApplicationPaths(self):
		# Load the users/application paths
		new_path = []
		apppath=win32ui.GetProfileVal('Python','Application Path','').split(';')
		for path in apppath:
			if len(path)>0:
				new_path.append(win32ui.FullPath(path))
		for extra_num in range(1,11):
			apppath=win32ui.GetProfileVal('Python','Application Path %d'%extra_num,'').split(';')
			if len(apppath) == 0:
				break
			for path in apppath:
				if len(path)>0:
					new_path.append(win32ui.FullPath(path))
		sys.path = new_path + sys.path
		
	def OnRClick(self,params):
		" Handle right click message "
		# put up the entire FILE menu!
		menu = win32ui.LoadMenu(win32ui.IDR_TEXTTYPE).GetSubMenu(0)
		menu.TrackPopupMenu(params[5]) # track at mouse position.
		return 0

	def OnDropFiles(self,msg):
		" Handle a file being dropped from file manager "
		hDropInfo = msg[2]
		self.frame.SetActiveWindow()	# active us
		nFiles = win32api.DragQueryFile(hDropInfo)
		try:
			for iFile in range(0,nFiles):
				fileName = win32api.DragQueryFile(hDropInfo, iFile)
				win32ui.GetApp().OpenDocumentFile( fileName )
		finally:
			win32api.DragFinish(hDropInfo);

		return 0

# No longer used by Pythonwin, as the C++ code has this same basic functionality
# but handles errors slightly better.
# It all still works, tho, so if you need similar functionality, you can use it.
# Therefore I havent deleted this code completely!
#	def CallbackManager( self, ob, args = () ):
#		"""Manage win32 callbacks.  Trap exceptions, report on them, then return 'All OK'
#		to the frame-work. """
#		import traceback
#		try:
#			ret = apply(ob, args)
#			return ret
#		except:
#			# take copies of the exception values, else other (handled) exceptions may get
#			# copied over by the other fns called.
#			win32ui.SetStatusText('An exception occured in a windows command handler.')
#			t, v, tb = sys.exc_info()
#			traceback.print_exception(t, v, tb.tb_next)
#			try:
#				sys.stdout.flush()
#			except (NameError, AttributeError):
#				pass

	# Command handlers.
	def OnFileMRU( self, id, code ):
		" Called when a File 1-n message is recieved "
		fileName = win32ui.GetRecentFileList()[id - win32ui.ID_FILE_MRU_FILE1]
		win32ui.GetApp().OpenDocumentFile(fileName)

	def HandleOnFileOpen( self, id, code ):
		" Called when FileOpen message is received "
		win32ui.GetApp().OnFileOpen()

	def HandleOnFileNew( self, id, code ):
		" Called when FileNew message is received "
		win32ui.GetApp().OnFileNew()

	def OnHelpAbout( self, id, code ):
		" Called when HelpAbout message is received.  Displays the About dialog. "
		win32ui.InitRichEdit()
		dlg=AboutBox()
		dlg.DoModal()

def _GetRegistryValue(key, val, default = None):
	# val is registry value - None for default val.
	try:
		hkey = win32api.RegOpenKey(win32con.HKEY_CURRENT_USER, key)
		return win32api.RegQueryValueEx(hkey, val)[0]
	except win32api.error:
		try:
			hkey = win32api.RegOpenKey(win32con.HKEY_LOCAL_MACHINE, key)
			return win32api.RegQueryValueEx(hkey, val)[0]
		except win32api.error:
			return default

scintilla = "Scintilla is Copyright 1998-2008 Neil Hodgson (http://www.scintilla.org)"
idle = "This program uses IDLE extensions by Guido van Rossum, Tim Peters and others."
contributors = "Thanks to the following people for making significant contributions: Roger Upole, Sidnei da Silva, Sam Rushing, Curt Hagenlocher, Dave Brennan, Roger Burnham, Gordon McMillan, Neil Hodgson, Laramie Leavitt. (let me know if I have forgotten you!)"
# The About Box
class AboutBox(dialog.Dialog):
	def __init__(self, idd=win32ui.IDD_ABOUTBOX):
		dialog.Dialog.__init__(self, idd)
	def OnInitDialog(self):
		text = "Pythonwin - Python IDE and GUI Framework for Windows.\n\n%s\n\nPython is %s\n\n%s\n\n%s\n\n%s" % (win32ui.copyright, sys.copyright, scintilla, idle, contributors)
		self.SetDlgItemText(win32ui.IDC_EDIT1, text)
		# Get the build number - written by installers.
		# For distutils build, read pywin32.version.txt
		import distutils.sysconfig
		site_packages = distutils.sysconfig.get_python_lib(plat_specific=1)
		try:
			build_no = open(os.path.join(site_packages, "pywin32.version.txt")).read().strip()
			ver = "pywin32 build %s" % build_no
		except EnvironmentError:
			ver = None
		if ver is None:
			# See if we are Part of Active Python
			ver = _GetRegistryValue("SOFTWARE\\ActiveState\\ActivePython", "CurrentVersion")
			if ver is not None:
				ver = "ActivePython build %s" % (ver,)
		if ver is None:
			ver = ""
		self.SetDlgItemText(win32ui.IDC_ABOUT_VERSION, ver)
		self.HookCommand(self.OnButHomePage, win32ui.IDC_BUTTON1)

	def OnButHomePage(self, id, code):
		if code == win32con.BN_CLICKED:
			win32api.ShellExecute(0, "open", "https://github.com/mhammond/pywin32", None, "", 1)

def Win32RawInput(prompt=None):
	"Provide raw_input() for gui apps"
	# flush stderr/out first.
	try:
		sys.stdout.flush()
		sys.stderr.flush()
	except:
		pass
	if prompt is None: prompt = ""
	ret=dialog.GetSimpleInput(prompt)
	if ret==None:
		raise KeyboardInterrupt("operation cancelled")
	return ret

def Win32Input(prompt=None):
	"Provide input() for gui apps"
	return eval(input(prompt))

def HookInput():
	try:
		raw_input
		# must be py2x...
		sys.modules['__builtin__'].raw_input=Win32RawInput
		sys.modules['__builtin__'].input=Win32Input
	except NameError:
		# must be py3k
		import code
		sys.modules['builtins'].input=Win32RawInput

def HaveGoodGUI():
	"""Returns true if we currently have a good gui available.
	"""
	return "pywin.framework.startup" in sys.modules

def CreateDefaultGUI( appClass = None):
	"""Creates a default GUI environment
	"""
	if appClass is None:
		from . import intpyapp # Bring in the default app - could be param'd later.
		appClass = intpyapp.InteractivePythonApp
	# Create and init the app.
	appClass().InitInstance()

def CheckCreateDefaultGUI():
	"""Checks and creates if necessary a default GUI environment.
	"""
	rc = HaveGoodGUI()
	if not rc:
		CreateDefaultGUI()
	return rc