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#!/usr/bin/env python

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

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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor

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#based on the plcopen standard. 

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#

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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD

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#

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#See COPYING file for copyrights details.

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#

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#This library is free software; you can redistribute it and/or

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#modify it under the terms of the GNU General Public

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#License as published by the Free Software Foundation; either

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#version 2.1 of the License, or (at your option) any later version.

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#

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#This library is distributed in the hope that it will be useful,

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#but WITHOUT ANY WARRANTY; without even the implied warranty of

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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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#General Public License for more details.

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#

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#You should have received a copy of the GNU General Public

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#License along with this library; if not, write to the Free Software

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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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from xml.dom import minidom

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from types import StringType, UnicodeType, TupleType

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import cPickle

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import os,sys,re

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import datetime

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from time import localtime

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from plcopen import plcopen

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from plcopen.structures import *

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from graphics.GraphicCommons import *

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from PLCGenerator import *

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duration_model = re.compile("(?:([0-9]{1,2})h)?(?:([0-9]{1,2})m(?!s))?(?:([0-9]{1,2})s)?(?:([0-9]{1,3}(?:\.[0-9]*)?)ms)?")

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ITEMS_EDITABLE = [ITEM_PROJECT,

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                  ITEM_POU,

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                  ITEM_VARIABLE,

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                  ITEM_TRANSITION,

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                  ITEM_ACTION,

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                  ITEM_CONFIGURATION,

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                  ITEM_RESOURCE,

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                  ITEM_DATATYPE

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                 ] = range(8)

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ITEMS_UNEDITABLE = [ITEM_DATATYPES,

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                    ITEM_FUNCTION,

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                    ITEM_FUNCTIONBLOCK,

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                    ITEM_PROGRAM,

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                    ITEM_TRANSITIONS,

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                    ITEM_ACTIONS,

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                    ITEM_CONFIGURATIONS,

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                    ITEM_RESOURCES,

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                    ITEM_PROPERTIES

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                   ] = range(8, 17)

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ITEMS_VARIABLE = [ITEM_VAR_LOCAL,

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                  ITEM_VAR_GLOBAL,

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                  ITEM_VAR_EXTERNAL,

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                  ITEM_VAR_TEMP,

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                  ITEM_VAR_INPUT,

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                  ITEM_VAR_OUTPUT,

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                  ITEM_VAR_INOUT

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                 ] = range(17, 24)

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VAR_CLASS_INFOS = {"Local" :    (plcopen.interface_localVars,    ITEM_VAR_LOCAL),

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                   "Global" :   (plcopen.interface_globalVars,   ITEM_VAR_GLOBAL),

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                   "External" : (plcopen.interface_externalVars, ITEM_VAR_EXTERNAL),

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                   "Temp" :     (plcopen.interface_tempVars,     ITEM_VAR_TEMP),

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                   "Input" :    (plcopen.interface_inputVars,    ITEM_VAR_INPUT),

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                   "Output" :   (plcopen.interface_outputVars,   ITEM_VAR_OUTPUT),

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                   "InOut" :    (plcopen.interface_inOutVars,    ITEM_VAR_INOUT)

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                  }

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LOCATIONS_ITEMS = [LOCATION_CONFNODE,

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                   LOCATION_MODULE,

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                   LOCATION_GROUP,

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                   LOCATION_VAR_INPUT,

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                   LOCATION_VAR_OUTPUT,

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                   LOCATION_VAR_MEMORY] = range(6)

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ScriptDirectory = os.path.split(os.path.realpath(__file__))[0]

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def GetUneditableNames():

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    _ = lambda x:x

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    return [_("User-defined POUs"), _("Functions"), _("Function Blocks"), 

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            _("Programs"), _("Data Types"), _("Transitions"), _("Actions"), 

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            _("Configurations"), _("Resources"), _("Properties")]

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UNEDITABLE_NAMES = GetUneditableNames()

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[USER_DEFINED_POUS, FUNCTIONS, FUNCTION_BLOCKS, PROGRAMS, 

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 DATA_TYPES, TRANSITIONS, ACTIONS, CONFIGURATIONS, 

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 RESOURCES, PROPERTIES] = UNEDITABLE_NAMES

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#-------------------------------------------------------------------------------

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#                         Undo Buffer for PLCOpenEditor

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#-------------------------------------------------------------------------------

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# Length of the buffer

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UNDO_BUFFER_LENGTH = 20

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"""

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Class implementing a buffer of changes made on the current editing model

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"""

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class UndoBuffer:

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    # Constructor initialising buffer

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    def __init__(self, currentstate, issaved = False):

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        self.Buffer = []

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        self.CurrentIndex = -1

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        self.MinIndex = -1

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        self.MaxIndex = -1

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        # if current state is defined

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        if currentstate:

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            self.CurrentIndex = 0

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            self.MinIndex = 0

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            self.MaxIndex = 0

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        # Initialising buffer with currentstate at the first place

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        for i in xrange(UNDO_BUFFER_LENGTH):

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            if i == 0:

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                self.Buffer.append(currentstate)

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            else:

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                self.Buffer.append(None)

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        # Initialising index of state saved

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        if issaved:

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            self.LastSave = 0

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        else:

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            self.LastSave = -1

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    # Add a new state in buffer

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    def Buffering(self, currentstate):

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        self.CurrentIndex = (self.CurrentIndex + 1) % UNDO_BUFFER_LENGTH

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        self.Buffer[self.CurrentIndex] = currentstate

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        # Actualising buffer limits

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        self.MaxIndex = self.CurrentIndex

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        if self.MinIndex == self.CurrentIndex:

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            # If the removed state was the state saved, there is no state saved in the buffer

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            if self.LastSave == self.MinIndex:

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                self.LastSave = -1

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            self.MinIndex = (self.MinIndex + 1) % UNDO_BUFFER_LENGTH

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        self.MinIndex = max(self.MinIndex, 0)

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    # Return current state of buffer

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    def Current(self):

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        return self.Buffer[self.CurrentIndex]

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    # Change current state to previous in buffer and return new current state

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    def Previous(self):

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        if self.CurrentIndex != self.MinIndex:

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            self.CurrentIndex = (self.CurrentIndex - 1) % UNDO_BUFFER_LENGTH

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            return self.Buffer[self.CurrentIndex]

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        return None

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    # Change current state to next in buffer and return new current state

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    def Next(self):

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        if self.CurrentIndex != self.MaxIndex:

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            self.CurrentIndex = (self.CurrentIndex + 1) % UNDO_BUFFER_LENGTH

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            return self.Buffer[self.CurrentIndex]

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        return None

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    # Return True if current state is the first in buffer

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    def IsFirst(self):

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        return self.CurrentIndex == self.MinIndex

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    # Return True if current state is the last in buffer

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    def IsLast(self):

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        return self.CurrentIndex == self.MaxIndex

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    # Note that current state is saved

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    def CurrentSaved(self):

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        self.LastSave = self.CurrentIndex

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    # Return True if current state is saved

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    def IsCurrentSaved(self):

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        return self.LastSave == self.CurrentIndex

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#-------------------------------------------------------------------------------

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#                           Controler for PLCOpenEditor

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#-------------------------------------------------------------------------------

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"""

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Class which controls the operations made on the plcopen model and answers to view requests

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"""

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class PLCControler:

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    # Create a new PLCControler

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    def __init__(self):

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        self.LastNewIndex = 0

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        self.Reset()

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    # Reset PLCControler internal variables

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    def Reset(self):

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        self.Project = None

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        self.ProjectBufferEnabled = True

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        self.ProjectBuffer = None

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        self.ProjectSaved = True

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        self.Buffering = False

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        self.FilePath = ""

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        self.FileName = ""

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        self.ProgramChunks = []

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        self.ProgramOffset = 0

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        self.NextCompiledProject = None

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        self.CurrentCompiledProject = None

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        self.ConfNodeTypes = []

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        self.ProgramFilePath = ""

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    def GetQualifierTypes(self):

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        return plcopen.QualifierList

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    def GetProject(self, debug = False):

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        if debug and self.CurrentCompiledProject is not None:

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            return self.CurrentCompiledProject

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        else:

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            return self.Project

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#-------------------------------------------------------------------------------

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#                         Project management functions

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#-------------------------------------------------------------------------------

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    # Return if a project is opened

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    def HasOpenedProject(self):

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        return self.Project is not None

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    # Create a new project by replacing the current one

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    def CreateNewProject(self, properties):

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        # Create the project

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        self.Project = plcopen.project()

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        properties["creationDateTime"] = datetime.datetime(*localtime()[:6])

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        self.Project.setfileHeader(properties)

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        self.Project.setcontentHeader(properties)

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        self.SetFilePath("")

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        # Initialize the project buffer

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        self.CreateProjectBuffer(False)

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        self.ProgramChunks = []

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        self.ProgramOffset = 0

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        self.NextCompiledProject = self.Copy(self.Project)

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        self.CurrentCompiledProject = None

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        self.Buffering = False

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    # Return project data type names

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    def GetProjectDataTypeNames(self, debug = False):

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        project = self.GetProject(debug)

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        if project is not None:

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            return [datatype.getname() for datatype in project.getdataTypes()]

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        return []

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    # Return project pou names

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    def GetProjectPouNames(self, debug = False):

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        project = self.GetProject(debug)

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        if project is not None:

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            return [pou.getname() for pou in project.getpous()]

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        return []

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    # Return project pou names

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    def GetProjectConfigNames(self, debug = False):

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        project = self.GetProject(debug)

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        if project is not None:

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            return [config.getname() for config in project.getconfigurations()]

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        return []

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    # Return project pou variables

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    def GetProjectPouVariables(self, pou_name = None, debug = False):

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        variables = []

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        project = self.GetProject(debug)

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        if project is not None:

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            for pou in project.getpous():

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                if pou_name is None or pou_name == pou.getname():

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                    variables.extend([var["Name"] for var in self.GetPouInterfaceVars(pou, debug)])

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                    for transition in pou.gettransitionList():

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                        variables.append(transition.getname())

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                    for action in pou.getactionList():

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                        variables.append(action.getname())

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        return variables

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    # Return file path if project is an open file

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    def GetFilePath(self):

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        return self.FilePath

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    # Return file path if project is an open file

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    def GetProgramFilePath(self):

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        return self.ProgramFilePath

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    # Return file name and point out if file is up to date

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    def GetFilename(self):

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        if self.Project is not None:

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            if self.ProjectIsSaved():

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                return self.FileName

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            else:

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                return "~%s~"%self.FileName

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        return ""

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    # Change file path and save file name or create a default one if file path not defined

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    def SetFilePath(self, filepath):

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        self.FilePath = filepath

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        if filepath == "":

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            self.LastNewIndex += 1

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            self.FileName = _("Unnamed%d")%self.LastNewIndex

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        else:

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            self.FileName = os.path.splitext(os.path.basename(filepath))[0]

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    # Change project properties

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    def SetProjectProperties(self, name = None, properties = None, buffer = True):

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        if self.Project is not None:

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            if name is not None:

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                self.Project.setname(name)

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            if properties is not None:

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                self.Project.setfileHeader(properties)

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                self.Project.setcontentHeader(properties)

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            if buffer and name is not None or properties is not None:

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                self.BufferProject()

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    # Return project name

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    def GetProjectName(self, debug=False):

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        project = self.GetProject(debug)

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        if project is not None:

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            return project.getname()

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        return None

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    # Return project properties

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    def GetProjectProperties(self, debug = False):

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        project = self.GetProject(debug)

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        if project is not None:

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            properties = project.getfileHeader()

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            properties.update(project.getcontentHeader())

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            return properties

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        return None

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    # Return project informations

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    def GetProjectInfos(self, debug = False):

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        project = self.GetProject(debug)

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        if project is not None:

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            infos = {"name": project.getname(), "type": ITEM_PROJECT}

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            datatypes = {"name": DATA_TYPES, "type": ITEM_DATATYPES, "values":[]}

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            for datatype in project.getdataTypes():

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                datatypes["values"].append({"name": datatype.getname(), "type": ITEM_DATATYPE, 

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                    "tagname": self.ComputeDataTypeName(datatype.getname()), "values": []})

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            pou_types = {"function": {"name": FUNCTIONS, "type": ITEM_FUNCTION, "values":[]},

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                         "functionBlock": {"name": FUNCTION_BLOCKS, "type": ITEM_FUNCTIONBLOCK, "values":[]},

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                         "program": {"name": PROGRAMS, "type": ITEM_PROGRAM, "values":[]}}

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            for pou in project.getpous():

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                pou_type = pou.getpouType()

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                pou_infos = {"name": pou.getname(), "type": ITEM_POU,

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                             "tagname": self.ComputePouName(pou.getname())}

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                pou_values = []

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                if pou.getbodyType() == "SFC":

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                    transitions = []

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                    for transition in pou.gettransitionList():

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                        transitions.append({"name": transition.getname(), "type": ITEM_TRANSITION, 

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                            "tagname": self.ComputePouTransitionName(pou.getname(), transition.getname()), 

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                            "values": []})

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                    pou_values.append({"name": TRANSITIONS, "type": ITEM_TRANSITIONS, "values": transitions})

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                    actions = []

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                    for action in pou.getactionList():

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                        actions.append({"name": action.getname(), "type": ITEM_ACTION, 

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                            "tagname": self.ComputePouActionName(pou.getname(), action.getname()), 

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                            "values": []})

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                    pou_values.append({"name": ACTIONS, "type": ITEM_ACTIONS, "values": actions})

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                if pou_type in pou_types:

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                    pou_infos["values"] = pou_values

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                    pou_types[pou_type]["values"].append(pou_infos)

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            configurations = {"name": CONFIGURATIONS, "type": ITEM_CONFIGURATIONS, "values": []}

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            for config in project.getconfigurations():

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                config_name = config.getname()

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                config_infos = {"name": config_name, "type": ITEM_CONFIGURATION, 

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                    "tagname": self.ComputeConfigurationName(config.getname()), 

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                    "values": []}

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                resources = {"name": RESOURCES, "type": ITEM_RESOURCES, "values": []}

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                for resource in config.getresource():

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                    resource_name = resource.getname()

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                    resource_infos = {"name": resource_name, "type": ITEM_RESOURCE, 

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                        "tagname": self.ComputeConfigurationResourceName(config.getname(), resource.getname()), 

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                        "values": []}

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                    resources["values"].append(resource_infos)

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                config_infos["values"] = [resources]

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                configurations["values"].append(config_infos)

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                               pou_types["program"], configurations]

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            return infos

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        return None

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