#####################################################################
#
# editor.py
#
# A general purpose text editor, built on top of the win32ui edit
# type, which is built on an MFC CEditView
#
#
# We now support reloading of externally modified documented
# (eg, presumably by some other process, such as source control or
# another editor.
# We also suport auto-loading of externally modified files.
# - if the current document has not been modified in this
# editor, but has been modified on disk, then the file
# can be automatically reloaded.
#
# Note that it will _always_ prompt you if the file in the editor has been modified.


import win32ui
import win32api
import win32con
import regex
import re
import string
import sys, os
import traceback
from pywin.mfc import docview, dialog, afxres

from pywin.framework.editor import GetEditorOption, SetEditorOption, GetEditorFontOption, SetEditorFontOption, defaultCharacterFormat

patImport=regex.symcomp('import \(<name>.*\)')
patIndent=regex.compile('^\\([ \t]*[~ \t]\\)')

ID_LOCATE_FILE = 0xe200
ID_GOTO_LINE = 0xe2001
MSG_CHECK_EXTERNAL_FILE = win32con.WM_USER+1999 ## WARNING: Duplicated in document.py and coloreditor.py

# Key Codes that modify the bufffer when Ctrl or Alt are NOT pressed.
MODIFYING_VK_KEYS = [win32con.VK_BACK, win32con.VK_TAB, win32con.VK_RETURN, win32con.VK_SPACE, win32con.VK_DELETE]
for k in range(48, 91):
	MODIFYING_VK_KEYS.append(k)

# Key Codes that modify the bufffer when Ctrl is pressed.
MODIFYING_VK_KEYS_CTRL = [win32con.VK_BACK, win32con.VK_RETURN, win32con.VK_SPACE, win32con.VK_DELETE]

# Key Codes that modify the bufffer when Alt is pressed.
MODIFYING_VK_KEYS_ALT = [win32con.VK_BACK, win32con.VK_RETURN, win32con.VK_SPACE, win32con.VK_DELETE]


# The editor itself starts here.
# Using the MFC Document/View model, we have an EditorDocument, which is responsible for
# managing the contents of the file, and a view which is responsible for rendering it.
#
# Due to a limitation in the Windows edit controls, we are limited to one view
# per document, although nothing in this code assumes this (I hope!)

isRichText=1 # We are using the Rich Text control.  This has not been tested with value "0" for quite some time!

#ParentEditorDocument=docview.Document
from .document import EditorDocumentBase
ParentEditorDocument=EditorDocumentBase
class EditorDocument(ParentEditorDocument):
	#
	# File loading and saving operations
	#
	def OnOpenDocument(self, filename):
		#
		# handle Unix and PC text file format.
		#

		# Get the "long name" of the file name, as it may have been translated
		# to short names by the shell.
		self.SetPathName(filename) # Must set this early!
		# Now do the work!
		self.BeginWaitCursor()
		win32ui.SetStatusText("Loading file...",1)
		try:
			f = open(filename,"rb")
		except IOError:
			win32ui.MessageBox(filename + '\nCan not find this file\nPlease verify that the correct path and file name are given')
			self.EndWaitCursor()
			return 0
		raw=f.read()
		f.close()
		contents = self.TranslateLoadedData(raw)
		rc = 0
		if win32ui.IsWin32s() and len(contents)>62000: # give or take a few bytes
			win32ui.MessageBox("This file is too big for Python on Windows 3.1\r\nPlease use another editor to view this file.")
		else:
			try:
				self.GetFirstView().SetWindowText(contents)
				rc = 1
			except TypeError: # Null byte in file.
				win32ui.MessageBox("This file contains NULL bytes, and can not be edited")
				rc = 0
				
			self.EndWaitCursor()
			self.SetModifiedFlag(0) # No longer dirty
			self._DocumentStateChanged()
		return rc

	def TranslateLoadedData(self, data):
		"""Given raw data read from a file, massage it suitable for the edit window"""
		# if a CR in the first 250 chars, then perform the expensive translate
		if data[:250].find('\r')==-1:
			win32ui.SetStatusText("Translating from Unix file format - please wait...",1)
			return re.sub('\r*\n','\r\n',data)
		else:
			return data
		
	def SaveFile(self, fileName, encoding=None):
		if isRichText:
			view = self.GetFirstView()
			view.SaveTextFile(fileName, encoding=encoding)
		else: # Old style edit view window.
			self.GetFirstView().SaveFile(fileName)
		try:
			# Make sure line cache has updated info about me!
			import linecache
			linecache.checkcache()
		except:
			pass

	#
	# Color state stuff
	#
	def SetAllLineColors(self, color = None):
		for view in self.GetAllViews():
			view.SetAllLineColors(color)

	def SetLineColor(self, lineNo, color):
		"Color a line of all views"
		for view in self.GetAllViews():
			view.SetLineColor(lineNo, color)

		
#	def StreamTextOut(self, data): ### This seems unreliable???
#		self.saveFileHandle.write(data)
#		return 1 # keep em coming!

#ParentEditorView=docview.EditView
ParentEditorView=docview.RichEditView
class EditorView(ParentEditorView):
	def __init__(self, doc):
		ParentEditorView.__init__(self, doc)
		if isRichText:
			self.SetWordWrap(win32ui.CRichEditView_WrapNone)

		self.addToMRU = 1
		self.HookHandlers()
		self.bCheckingFile = 0
		
		self.defCharFormat = GetEditorFontOption("Default Font", defaultCharacterFormat)

		# Smart tabs override everything else if context can be worked out.
		self.bSmartTabs = GetEditorOption("Smart Tabs", 1)

		self.tabSize = GetEditorOption("Tab Size", 8)
		self.indentSize = GetEditorOption("Indent Size", 8)
		# If next indent is at a tab position, and useTabs is set, a tab will be inserted.
		self.bUseTabs = GetEditorOption("Use Tabs", 1)

	def OnInitialUpdate(self):
		rc = self._obj_.OnInitialUpdate()
		self.SetDefaultCharFormat(self.defCharFormat)
		return rc

	def CutCurLine(self):
		curLine = self._obj_.LineFromChar()
		nextLine = curLine+1
		start = self._obj_.LineIndex(curLine)
		end = self._obj_.LineIndex(nextLine)
		if end==0:	# must be last line.
			end = start + self.end.GetLineLength(curLine)
		self._obj_.SetSel(start,end)
		self._obj_.Cut()
	def _PrepareUserStateChange(self):
		"Return selection, lineindex, etc info, so it can be restored"
		self.SetRedraw(0)
		return self.GetModify(), self.GetSel(), self.GetFirstVisibleLine()
	def _EndUserStateChange(self, info):
		scrollOff = info[2] - self.GetFirstVisibleLine()
		if scrollOff:
			self.LineScroll(scrollOff)
		self.SetSel(info[1])
		self.SetModify(info[0])
		self.SetRedraw(1)
		self.InvalidateRect()
		self.UpdateWindow()

	def _UpdateUIForState(self):
		self.SetReadOnly(self.GetDocument()._IsReadOnly())
	
	def SetAllLineColors(self, color = None):
		if isRichText:
			info = self._PrepareUserStateChange()
			try:
				if color is None: color = self.defCharFormat[4]
				self.SetSel(0,-1)
				self.SetSelectionCharFormat((win32con.CFM_COLOR, 0,0,0,color))
			finally:
				self._EndUserStateChange(info)

	def SetLineColor(self, lineNo, color):
		"lineNo is the 1 based line number to set.  If color is None, default color is used."
		if isRichText:
			info = self._PrepareUserStateChange()
			try:
				if color is None: color = self.defCharFormat[4]
				lineNo = lineNo-1
				startIndex = self.LineIndex(lineNo)
				if startIndex!=-1:
					self.SetSel(startIndex, self.LineIndex(lineNo+1))
					self.SetSelectionCharFormat((win32con.CFM_COLOR, 0,0,0,color))
			finally:
				self._EndUserStateChange(info)
				
	def Indent(self):
		"""Insert an indent to move the cursor to the next tab position.
		
		Honors the tab size and 'use tabs' settings.  Assumes the cursor is already at the
		position to be indented, and the selection is a single character (ie, not a block)
		"""
		start, end = self._obj_.GetSel()
		startLine = self._obj_.LineFromChar(start)
		line = self._obj_.GetLine(startLine)
		realCol = start - self._obj_.LineIndex(startLine)
		# Calulate the next tab stop.
		# Expand existing tabs.
		curCol = 0
		for ch in line[:realCol]:
			if ch=='\t':
				curCol = ((curCol / self.tabSize) + 1) * self.tabSize
			else:
				curCol = curCol + 1
		nextColumn = ((curCol / self.indentSize) + 1) * self.indentSize
#		print "curCol is", curCol, "nextColumn is", nextColumn
		ins = None
		if self.bSmartTabs:
			# Look for some context.
			if realCol==0: # Start of the line - see if the line above can tell us
				lookLine = startLine-1
				while lookLine >= 0:
					check = self._obj_.GetLine(lookLine)[0:1]
					if check in ['\t', ' ']:
						ins = check
						break
					lookLine = lookLine - 1
			else: # See if the previous char can tell us
				check = line[realCol-1]
				if check in ['\t', ' ']:
					ins = check

		# Either smart tabs off, or not smart enough!
		# Use the "old style" settings.
		if ins is None: 			
			if self.bUseTabs and nextColumn % self.tabSize==0:
				ins = '\t'
			else:
				ins = ' '
				
		if ins == ' ': 
			# Calc the number of spaces to take us to the next stop
			ins = ins * (nextColumn - curCol)

		self._obj_.ReplaceSel(ins)
		

	def BlockDent(self, isIndent, startLine, endLine):
		" Indent/Undent all lines specified "
		if not self.GetDocument().CheckMakeDocumentWritable(): return 0
		tabSize=self.tabSize	# hard-code for now!
		info = self._PrepareUserStateChange()
		try:
			for lineNo in range(startLine, endLine):
				pos=self._obj_.LineIndex(lineNo)
				self._obj_.SetSel(pos, pos)
				if isIndent:
					self.Indent()
				else:
					line = self._obj_.GetLine(lineNo)
					try:
						noToDel = 0
						if line[0]=='\t':
							noToDel = 1
						elif line[0]==' ':
							for noToDel in range(0,tabSize):
								if line[noToDel]!=' ':
									break
							else:
								noToDel=tabSize
						if noToDel:
							self._obj_.SetSel(pos, pos+noToDel)
							self._obj_.Clear()
					except IndexError:
						pass
		finally:
			self._EndUserStateChange(info)
		self.GetDocument().SetModifiedFlag(1) # Now dirty
		self._obj_.SetSel(self.LineIndex(startLine), self.LineIndex(endLine))
	
	def GotoLine(self, lineNo = None):
		try:
			if lineNo is None:
				lineNo = int(input("Enter Line Number"))
		except (ValueError, KeyboardInterrupt):
			return 0
		self.GetLineCount() # Seems to be needed when file first opened???
		charNo = self.LineIndex(lineNo-1)
		self.SetSel(charNo)

	def HookHandlers(self):	# children can override, but should still call me!
#		self.HookAllKeyStrokes(self.OnKey)
		self.HookMessage(self.OnCheckExternalDocumentUpdated,MSG_CHECK_EXTERNAL_FILE)
		self.HookMessage(self.OnRClick,win32con.WM_RBUTTONDOWN)
		self.HookMessage(self.OnSetFocus, win32con.WM_SETFOCUS)
		self.HookMessage(self.OnKeyDown, win32con.WM_KEYDOWN)
		self.HookKeyStroke(self.OnKeyCtrlY, 25)	# ^Y
		self.HookKeyStroke(self.OnKeyCtrlG, 7)	# ^G
		self.HookKeyStroke(self.OnKeyTab, 9)	# TAB
		self.HookKeyStroke(self.OnKeyEnter, 13) # Enter
		self.HookCommand(self.OnCmdLocateFile, ID_LOCATE_FILE)
		self.HookCommand(self.OnCmdGotoLine, ID_GOTO_LINE)
		self.HookCommand(self.OnEditPaste, afxres.ID_EDIT_PASTE)
		self.HookCommand(self.OnEditCut, afxres.ID_EDIT_CUT)

	# Hook Handlers
	def OnSetFocus(self,msg):
		# Even though we use file change notifications, we should be very sure about it here.
		self.OnCheckExternalDocumentUpdated(msg)

	def OnRClick(self,params):
		menu = win32ui.CreatePopupMenu()
		
		# look for a module name
		line=self._obj_.GetLine().strip()
		flags=win32con.MF_STRING|win32con.MF_ENABLED
		if patImport.match(line)==len(line):
			menu.AppendMenu(flags, ID_LOCATE_FILE, "&Locate %s.py"%patImport.group('name'))
			menu.AppendMenu(win32con.MF_SEPARATOR);
		menu.AppendMenu(flags, win32ui.ID_EDIT_UNDO, '&Undo')
		menu.AppendMenu(win32con.MF_SEPARATOR);
		menu.AppendMenu(flags, win32ui.ID_EDIT_CUT, 'Cu&t')
		menu.AppendMenu(flags, win32ui.ID_EDIT_COPY, '&Copy')
		menu.AppendMenu(flags, win32ui.ID_EDIT_PASTE, '&Paste')
		menu.AppendMenu(flags, win32con.MF_SEPARATOR);
		menu.AppendMenu(flags, win32ui.ID_EDIT_SELECT_ALL, '&Select all')
		menu.AppendMenu(flags, win32con.MF_SEPARATOR);
		menu.AppendMenu(flags, ID_GOTO_LINE, '&Goto line...')
		menu.TrackPopupMenu(params[5])
		return 0

	def OnCmdGotoLine(self, cmd, code):
		self.GotoLine()
		return 0

	def OnCmdLocateFile(self, cmd, code):
		modName = patImport.group('name')
		if not modName:
			return 0
		import pywin.framework.scriptutils
		fileName = pywin.framework.scriptutils.LocatePythonFile(modName)
		if fileName is None:
			win32ui.SetStatusText("Can't locate module %s" % modName)
		else:
			win32ui.GetApp().OpenDocumentFile(fileName)
		return 0	

	# Key handlers
	def OnKeyEnter(self, key):
		if not self.GetDocument().CheckMakeDocumentWritable(): return 0
		curLine = self._obj_.GetLine()
		self._obj_.ReplaceSel('\r\n')	# insert the newline
		# If the current line indicates the next should be indented,
		# then copy the current indentation to this line.
		res = patIndent.match(curLine,0)
		if res>0 and curLine.strip():
			curIndent = patIndent.group(1)
			self._obj_.ReplaceSel(curIndent)
		return 0	# dont pass on

	def OnKeyCtrlY(self, key):
		if not self.GetDocument().CheckMakeDocumentWritable(): return 0
		self.CutCurLine()
		return 0	# dont let him have it!
	def OnKeyCtrlG(self, key):
		self.GotoLine()
		return 0	# dont let him have it!
	def OnKeyTab(self, key):
		if not self.GetDocument().CheckMakeDocumentWritable(): return 0
		start, end = self._obj_.GetSel()
		if start==end:	# normal TAB key
			self.Indent()
			return 0 # we handled this.

		# Otherwise it is a block indent/dedent.
		if start>end:
			start, end = end, start	# swap them.
		startLine = self._obj_.LineFromChar(start)
		endLine = self._obj_.LineFromChar(end)

		self.BlockDent(win32api.GetKeyState(win32con.VK_SHIFT)>=0, startLine, endLine)
		return 0

	
	def OnEditPaste(self, id, code):
		# Return 1 if we can make the file editable.(or it already is!)
		return self.GetDocument().CheckMakeDocumentWritable()

	def OnEditCut(self, id, code):
		# Return 1 if we can make the file editable.(or it already is!)
		return self.GetDocument().CheckMakeDocumentWritable()

	def OnKeyDown(self, msg):
		key = msg[2]
		if win32api.GetKeyState(win32con.VK_CONTROL) & 0x8000:
			modList = MODIFYING_VK_KEYS_CTRL
		elif win32api.GetKeyState(win32con.VK_MENU) & 0x8000:
			modList = MODIFYING_VK_KEYS_ALT
		else:
			modList = MODIFYING_VK_KEYS

		if key in modList:
			# Return 1 if we can make the file editable.(or it already is!)
			return self.GetDocument().CheckMakeDocumentWritable()
		return 1 # Pass it on OK

#	def OnKey(self, key):
#		return self.GetDocument().CheckMakeDocumentWritable()

	def OnCheckExternalDocumentUpdated(self, msg):
		if self._obj_ is None or self.bCheckingFile: return
		self.bCheckingFile = 1
		self.GetDocument().CheckExternalDocumentUpdated()
		self.bCheckingFile = 0

from .template import EditorTemplateBase
class EditorTemplate(EditorTemplateBase):
	def __init__(self, res=win32ui.IDR_TEXTTYPE, makeDoc=None, makeFrame=None, makeView=None):
		if makeDoc is None: makeDoc = EditorDocument
		if makeView is None: makeView = EditorView
		EditorTemplateBase.__init__(self, res, makeDoc, makeFrame, makeView)

	def _CreateDocTemplate(self, resourceId):
		return win32ui.CreateRichEditDocTemplate(resourceId)

	def CreateWin32uiDocument(self):
		return self.DoCreateRichEditDoc()
	
def Create(fileName = None, title=None, template = None):
	return editorTemplate.OpenDocumentFile(fileName)

from pywin.framework.editor import GetDefaultEditorModuleName
prefModule = GetDefaultEditorModuleName()
# Initialize only if this is the "default" editor.
if __name__==prefModule:
	# For debugging purposes, when this module may be reloaded many times.
	try:
		win32ui.GetApp().RemoveDocTemplate(editorTemplate)
	except (NameError, win32ui.error):
		pass

	editorTemplate = EditorTemplate()
	win32ui.GetApp().AddDocTemplate(editorTemplate)
