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import os

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from xml.dom import minidom

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import cPickle

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from xmlclass import *

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from PLCControler import UndoBuffer

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from editors.CodeFileEditor import SECTIONS_NAMES

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CodeFileClasses = GenerateClassesFromXSD(os.path.join(os.path.dirname(__file__), "code_file.xsd"))

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class CodeFile:

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    def __init__(self):

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        filepath = self.CodeFileName()

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        self.CodeFile = CodeFileClasses["CodeFile"]()

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        if os.path.isfile(filepath):

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            xmlfile = open(filepath, 'r')

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            tree = minidom.parse(xmlfile)

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            xmlfile.close()

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            for child in tree.childNodes:

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                if child.nodeType == tree.ELEMENT_NODE and child.nodeName in ["CodeFile", "CFile"]:

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                    self.CodeFile.loadXMLTree(child, ["xmlns", "xmlns:xsi", "xsi:schemaLocation"])

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                    self.CreateCodeFileBuffer(True)

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        else:

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            self.CreateCodeFileBuffer(False)

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            self.OnCTNSave()

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    def GetBaseTypes(self):

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        return self.GetCTRoot().GetBaseTypes()

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    def GetDataTypes(self, basetypes = False):

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        return self.GetCTRoot().GetDataTypes(basetypes=basetypes)

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    def SetVariables(self, variables):

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        self.CodeFile.variables.setvariable([])

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        for var in variables:

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            variable = CodeFileClasses["variables_variable"]()

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            variable.setname(var["Name"])

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            variable.settype(var["Type"])

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            variable.setinitial(var["Initial"])

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            self.CodeFile.variables.appendvariable(variable)

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    def GetVariables(self):

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        datas = []

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        for var in self.CodeFile.variables.getvariable():

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            datas.append({"Name" : var.getname(), "Type" : var.gettype(), "Initial" : var.getinitial()})

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        return datas

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    def SetTextParts(self, parts):

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        for section, code_object in zip(

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            SECTIONS_NAMES,

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            [self.CodeFile.includes,

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             self.CodeFile.globals,

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             self.CodeFile.initFunction,

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             self.CodeFile.cleanUpFunction,

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             self.CodeFile.retrieveFunction,

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             self.CodeFile.publishFunction]):

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            code_object.settext(parts[section])

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    def GetTextParts(self):

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        parts = {}

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        for section, code_object in zip(

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            SECTIONS_NAMES,

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            [self.CodeFile.includes,

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             self.CodeFile.globals,

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             self.CodeFile.initFunction,

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             self.CodeFile.cleanUpFunction,

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             self.CodeFile.retrieveFunction,

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             self.CodeFile.publishFunction]):

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            parts[section] = code_object.gettext()

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        return parts

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    def CTNTestModified(self):

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        return self.ChangesToSave or not self.CodeFileIsSaved()    

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    def OnCTNSave(self, from_project_path=None):

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        filepath = self.CodeFileName()

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        text = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"

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        extras = {"xmlns":"http://www.w3.org/2001/XMLSchema",

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                  "xmlns:xsi":"http://www.w3.org/2001/XMLSchema-instance",

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                  "xsi:schemaLocation" : "code_file.xsd"}

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        text += self.CodeFile.generateXMLText("CodeFile", 0, extras)

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        xmlfile = open(filepath,"w")

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        xmlfile.write(text.encode("utf-8"))

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        xmlfile.close()

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        self.MarkCodeFileAsSaved()

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        return True

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    def CTNGlobalInstances(self):

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        current_location = self.GetCurrentLocation()

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        return [(variable.getname(),

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                 variable.gettype(),

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                 variable.getinitial())

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                for variable in self.CodeFile.variables.variable]

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

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#                      Current Buffering Management Functions

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

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    """

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    Return a copy of the codefile model

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    """

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    def Copy(self, model):

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        return cPickle.loads(cPickle.dumps(model))

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    def CreateCodeFileBuffer(self, saved):

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        self.Buffering = False

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        self.CodeFileBuffer = UndoBuffer(cPickle.dumps(self.CodeFile), saved)

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    def BufferCodeFile(self):

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        self.CodeFileBuffer.Buffering(cPickle.dumps(self.CodeFile))

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    def StartBuffering(self):

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        self.Buffering = True

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    def EndBuffering(self):

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        if self.Buffering:

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            self.CodeFileBuffer.Buffering(cPickle.dumps(self.CodeFile))

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            self.Buffering = False

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    def MarkCodeFileAsSaved(self):

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        self.EndBuffering()

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        self.CodeFileBuffer.CurrentSaved()

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    def CodeFileIsSaved(self):

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        return self.CodeFileBuffer.IsCurrentSaved() and not self.Buffering

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    def LoadPrevious(self):

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        self.EndBuffering()

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        self.CodeFile = cPickle.loads(self.CodeFileBuffer.Previous())

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    def LoadNext(self):

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        self.CodeFile = cPickle.loads(self.CodeFileBuffer.Next())

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    def GetBufferState(self):

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        first = self.CodeFileBuffer.IsFirst() and not self.Buffering

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        last = self.CodeFileBuffer.IsLast()

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        return not first, not last

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