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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 CFileEditor import CFileEditor

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from PLCControler import UndoBuffer, LOCATION_CONFNODE, LOCATION_VAR_INPUT, LOCATION_VAR_OUTPUT 

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CFileClasses = GenerateClassesFromXSD(os.path.join(os.path.dirname(__file__), "cext_xsd.xsd"))

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TYPECONVERSION = {"BOOL" : "X", "SINT" : "B", "INT" : "W", "DINT" : "D", "LINT" : "L",

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    "USINT" : "B", "UINT" : "W", "UDINT" : "D", "ULINT" : "L", "REAL" : "D", "LREAL" : "L",

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    "STRING" : "B", "BYTE" : "B", "WORD" : "W", "DWORD" : "D", "LWORD" : "L", "WSTRING" : "W"}

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class CFile:

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    XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>

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    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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      <xsd:element name="CExtension">

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        <xsd:complexType>

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          <xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>

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          <xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>

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        </xsd:complexType>

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      </xsd:element>

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    </xsd:schema>

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    """

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    EditorType = CFileEditor

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    def __init__(self):

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        filepath = self.CFileName()

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        self.CFile = CFileClasses["CFile"]()

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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 == "CFile":

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

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                    self.CreateCFileBuffer(True)

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        else:

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            self.CreateCFileBuffer(False)

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            self.OnCTNSave()

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    def GetIconName(self):

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        return "Cfile"

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    def CFileName(self):

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        return os.path.join(self.CTNPath(), "cfile.xml")

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    def GetBaseTypes(self):

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        return self.GetCTRoot().GetBaseTypes()

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    def GetDataTypes(self, basetypes = False, only_locatables = False):

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

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    def GetSizeOfType(self, type):

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        return TYPECONVERSION.get(self.GetCTRoot().GetBaseType(type), None)

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    def SetVariables(self, variables):

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        self.CFile.variables.setvariable([])

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        for var in variables:

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            variable = CFileClasses["variables_variable"]()

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            variable.setname(var["Name"])

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            variable.settype(var["Type"])

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            variable.setclass(var["Class"])

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            self.CFile.variables.appendvariable(variable)

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    def GetVariables(self):

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        datas = []

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

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            datas.append({"Name" : var.getname(), "Type" : var.gettype(), "Class" : var.getclass()})

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        return datas

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    def GetVariableLocationTree(self):

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        '''See ConfigTreeNode.GetVariableLocationTree() for a description.'''

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        current_location = ".".join(map(str, self.GetCurrentLocation()))

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        vars = []

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        input = memory = output = 0

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

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            var_size = self.GetSizeOfType(var.gettype())

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            var_location = ""

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            if var.getclass() == "input":

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                var_class = LOCATION_VAR_INPUT

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                if var_size is not None:

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                    var_location = "%%I%s%s.%d"%(var_size, current_location, input)

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                input += 1

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            elif var.getclass() == "memory":

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                var_class = LOCATION_VAR_INPUT

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                if var_size is not None:

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                    var_location = "%%M%s%s.%d"%(var_size, current_location, memory)

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                memory += 1

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            else:

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                var_class = LOCATION_VAR_OUTPUT

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                if var_size is not None:

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                    var_location = "%%Q%s%s.%d"%(var_size, current_location, output)

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                output += 1

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            vars.append({"name": var.getname(),

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                         "type": var_class,

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                         "size": var_size,

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                         "IEC_type": var.gettype(),

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                         "var_name": var.getname(),

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                         "location": var_location,

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                         "description": "",

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                         "children": []})

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        return  {"name": self.BaseParams.getName(),

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                "type": LOCATION_CONFNODE,

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                "location": self.GetFullIEC_Channel(),

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                "children": vars}

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    def SetPartText(self, name, text):

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        if name == "Includes":

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            self.CFile.includes.settext(text)

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        elif name == "Globals":

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            self.CFile.globals.settext(text)

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        elif name == "Init":

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            self.CFile.initFunction.settext(text)

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        elif name == "CleanUp":

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            self.CFile.cleanUpFunction.settext(text)

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        elif name == "Retrieve":

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            self.CFile.retrieveFunction.settext(text)

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        elif name == "Publish":

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            self.CFile.publishFunction.settext(text)

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    def GetPartText(self, name):

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        if name == "Includes":

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            return self.CFile.includes.gettext()

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        elif name == "Globals":

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            return self.CFile.globals.gettext()

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        elif name == "Init":

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            return self.CFile.initFunction.gettext()

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        elif name == "CleanUp":

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            return self.CFile.cleanUpFunction.gettext()

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        elif name == "Retrieve":

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            return self.CFile.retrieveFunction.gettext()

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        elif name == "Publish":

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            return self.CFile.publishFunction.gettext()

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        return ""

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    def CTNTestModified(self):

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        return self.ChangesToSave or not self.CFileIsSaved()    

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    def OnCTNSave(self):

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        filepath = self.CFileName()

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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" : "cext_xsd.xsd"}

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        text += self.CFile.generateXMLText("CFile", 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.MarkCFileAsSaved()

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        return True

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    def CTNGenerate_C(self, buildpath, locations):

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        """

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        Generate C code

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        @param current_location: Tupple containing confnode IEC location : %I0.0.4.5 => (0,0,4,5)

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        @param locations: List of complete variables locations \

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            [{"IEC_TYPE" : the IEC type (i.e. "INT", "STRING", ...)

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            "NAME" : name of the variable (generally "__IW0_1_2" style)

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            "DIR" : direction "Q","I" or "M"

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            "SIZE" : size "X", "B", "W", "D", "L"

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            "LOC" : tuple of interger for IEC location (0,1,2,...)

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            }, ...]

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        @return: [(C_file_name, CFLAGS),...] , LDFLAGS_TO_APPEND

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        """

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        current_location = self.GetCurrentLocation()

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        # define a unique name for the generated C file

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        location_str = "_".join(map(str, current_location))

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        text = "/* Code generated by Beremiz c_ext confnode */\n\n"

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        # Adding includes

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        text += "/* User includes */\n"

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        text += self.CFile.includes.gettext()

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        text += "\n"

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        text += '#include "iec_types.h"'

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        # Adding variables

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        vars = []

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        inputs = memories = outputs = 0

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        for variable in self.CFile.variables.variable:

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            var = {"Name" : variable.getname(), "Type" : variable.gettype()}

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            if variable.getclass() == "input":

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                var["location"] = "__I%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, inputs)

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                inputs += 1

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            elif variable.getclass() == "memory":

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                var["location"] = "__M%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, memories)

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                memories += 1

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            else:

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                var["location"] = "__Q%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, outputs)

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                outputs += 1

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            vars.append(var)

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        text += "/* Beremiz c_ext confnode user variables definition */\n"

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        base_types = self.GetCTRoot().GetBaseTypes()

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        for var in vars:

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            if var["Type"] in base_types:

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                prefix = "IEC_"

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            else:

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                prefix = ""

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            text += "%s%s beremiz%s;\n"%(prefix, var["Type"], var["location"])

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            text += "%s%s *%s = &beremiz%s;\n"%(prefix, var["Type"], var["location"], var["location"])

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        text += "/* User variables reference */\n"

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        for var in vars:

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            text += "#define %s beremiz%s\n"%(var["Name"], var["location"])

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        text += "\n"

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        # Adding user global variables and routines

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        text += "/* User internal user variables and routines */\n"

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        text += self.CFile.globals.gettext()

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        # Adding Beremiz confnode functions

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        text += "/* Beremiz confnode functions */\n"

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        text += "int __init_%s(int argc,char **argv)\n{\n"%location_str

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        text += self.CFile.initFunction.gettext()

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        text += "  return 0;\n"

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        text += "\n}\n\n"

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        text += "void __cleanup_%s(void)\n{\n"%location_str

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        text += self.CFile.cleanUpFunction.gettext()

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        text += "\n}\n\n"

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        text += "void __retrieve_%s(void)\n{\n"%location_str

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        text += self.CFile.retrieveFunction.gettext()

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        text += "\n}\n\n"

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        text += "void __publish_%s(void)\n{\n"%location_str

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        text += self.CFile.publishFunction.gettext()

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        text += "\n}\n\n"

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        Gen_Cfile_path = os.path.join(buildpath, "CFile_%s.c"%location_str)

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        cfile = open(Gen_Cfile_path,'w')

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        cfile.write(text)

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        cfile.close()

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        matiec_flags = '"-I%s"'%os.path.abspath(self.GetCTRoot().GetIECLibPath())

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        return [(Gen_Cfile_path, str(self.CExtension.getCFLAGS() + matiec_flags))],str(self.CExtension.getLDFLAGS()),True

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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 cfile 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 CreateCFileBuffer(self, saved):

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        self.Buffering = False

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        self.CFileBuffer = UndoBuffer(cPickle.dumps(self.CFile), saved)

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    def BufferCFile(self):

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        self.CFileBuffer.Buffering(cPickle.dumps(self.CFile))

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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.CFileBuffer.Buffering(cPickle.dumps(self.CFile))

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            self.Buffering = False

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    def MarkCFileAsSaved(self):

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        self.EndBuffering()

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        self.CFileBuffer.CurrentSaved()

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    def CFileIsSaved(self):

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

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    def LoadPrevious(self):

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        self.EndBuffering()

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        self.CFile = cPickle.loads(self.CFileBuffer.Previous())

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    def LoadNext(self):

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        self.CFile = cPickle.loads(self.CFileBuffer.Next())

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    def GetBufferState(self):

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

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        last = self.CFileBuffer.IsLast()

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        return not first, not last

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