import os
from xml.dom import minidom
import cPickle

from xmlclass import *

from CFileEditor import CFileEditor
from PLCControler import UndoBuffer, LOCATION_CONFNODE, LOCATION_VAR_INPUT, LOCATION_VAR_OUTPUT 

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

TYPECONVERSION = {"BOOL" : "X", "SINT" : "B", "INT" : "W", "DINT" : "D", "LINT" : "L",
    "USINT" : "B", "UINT" : "W", "UDINT" : "D", "ULINT" : "L", "REAL" : "D", "LREAL" : "L",
    "STRING" : "B", "BYTE" : "B", "WORD" : "W", "DWORD" : "D", "LWORD" : "L", "WSTRING" : "W"}

class CFile:
    XSD = """<?xml version="1.0" encoding="ISO-8859-1" ?>
    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <xsd:element name="CExtension">
        <xsd:complexType>
          <xsd:attribute name="CFLAGS" type="xsd:string" use="required"/>
          <xsd:attribute name="LDFLAGS" type="xsd:string" use="required"/>
        </xsd:complexType>
      </xsd:element>
    </xsd:schema>
    """
    EditorType = CFileEditor
    
    def __init__(self):
        filepath = self.CFileName()
        
        self.CFile = CFileClasses["CFile"]()
        if os.path.isfile(filepath):
            xmlfile = open(filepath, 'r')
            tree = minidom.parse(xmlfile)
            xmlfile.close()
            
            for child in tree.childNodes:
                if child.nodeType == tree.ELEMENT_NODE and child.nodeName == "CFile":
                    self.CFile.loadXMLTree(child, ["xmlns", "xmlns:xsi", "xsi:schemaLocation"])
                    self.CreateCFileBuffer(True)
        else:
            self.CreateCFileBuffer(False)
            self.OnCTNSave()

    def GetIconName(self):
        return "Cfile"

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

    def GetBaseTypes(self):
        return self.GetCTRoot().GetBaseTypes()

    def GetDataTypes(self, basetypes = False, only_locatables = False):
        return self.GetCTRoot().GetDataTypes(basetypes=basetypes, only_locatables=only_locatables)

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

    def SetVariables(self, variables):
        self.CFile.variables.setvariable([])
        for var in variables:
            variable = CFileClasses["variables_variable"]()
            variable.setname(var["Name"])
            variable.settype(var["Type"])
            variable.setclass(var["Class"])
            self.CFile.variables.appendvariable(variable)
    
    def GetVariables(self):
        datas = []
        for var in self.CFile.variables.getvariable():
            datas.append({"Name" : var.getname(), "Type" : var.gettype(), "Class" : var.getclass()})
        return datas

    def GetVariableLocationTree(self):
        '''See ConfigTreeNode.GetVariableLocationTree() for a description.'''

        current_location = ".".join(map(str, self.GetCurrentLocation()))
        
        vars = []
        input = memory = output = 0
        for var in self.CFile.variables.getvariable():
            var_size = self.GetSizeOfType(var.gettype())
            var_location = ""
            if var.getclass() == "input":
                var_class = LOCATION_VAR_INPUT
                if var_size is not None:
                    var_location = "%%I%s%s.%d"%(var_size, current_location, input)
                input += 1
            elif var.getclass() == "memory":
                var_class = LOCATION_VAR_INPUT
                if var_size is not None:
                    var_location = "%%M%s%s.%d"%(var_size, current_location, memory)
                memory += 1
            else:
                var_class = LOCATION_VAR_OUTPUT
                if var_size is not None:
                    var_location = "%%Q%s%s.%d"%(var_size, current_location, output)
                output += 1
            vars.append({"name": var.getname(),
                         "type": var_class,
                         "size": var_size,
                         "IEC_type": var.gettype(),
                         "var_name": var.getname(),
                         "location": var_location,
                         "description": "",
                         "children": []})
                
        return  {"name": self.BaseParams.getName(),
                "type": LOCATION_CONFNODE,
                "location": self.GetFullIEC_Channel(),
                "children": vars}

    def SetPartText(self, name, text):
        if name == "Includes":
            self.CFile.includes.settext(text)
        elif name == "Globals":
            self.CFile.globals.settext(text)
        elif name == "Init":
            self.CFile.initFunction.settext(text)
        elif name == "CleanUp":
            self.CFile.cleanUpFunction.settext(text)
        elif name == "Retrieve":
            self.CFile.retrieveFunction.settext(text)
        elif name == "Publish":
            self.CFile.publishFunction.settext(text)
        
    def GetPartText(self, name):
        if name == "Includes":
            return self.CFile.includes.gettext()
        elif name == "Globals":
            return self.CFile.globals.gettext()
        elif name == "Init":
            return self.CFile.initFunction.gettext()
        elif name == "CleanUp":
            return self.CFile.cleanUpFunction.gettext()
        elif name == "Retrieve":
            return self.CFile.retrieveFunction.gettext()
        elif name == "Publish":
            return self.CFile.publishFunction.gettext()
        return ""
                
    def CTNTestModified(self):
        return self.ChangesToSave or not self.CFileIsSaved()    

    def OnCTNSave(self):
        filepath = self.CFileName()
        
        text = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"
        extras = {"xmlns":"http://www.w3.org/2001/XMLSchema",
                  "xmlns:xsi":"http://www.w3.org/2001/XMLSchema-instance",
                  "xsi:schemaLocation" : "cext_xsd.xsd"}
        text += self.CFile.generateXMLText("CFile", 0, extras)

        xmlfile = open(filepath,"w")
        xmlfile.write(text.encode("utf-8"))
        xmlfile.close()
        
        self.MarkCFileAsSaved()
        return True

    def CTNGenerate_C(self, buildpath, locations):
        """
        Generate C code
        @param current_location: Tupple containing confnode IEC location : %I0.0.4.5 => (0,0,4,5)
        @param locations: List of complete variables locations \
            [{"IEC_TYPE" : the IEC type (i.e. "INT", "STRING", ...)
            "NAME" : name of the variable (generally "__IW0_1_2" style)
            "DIR" : direction "Q","I" or "M"
            "SIZE" : size "X", "B", "W", "D", "L"
            "LOC" : tuple of interger for IEC location (0,1,2,...)
            }, ...]
        @return: [(C_file_name, CFLAGS),...] , LDFLAGS_TO_APPEND
        """
        current_location = self.GetCurrentLocation()
        # define a unique name for the generated C file
        location_str = "_".join(map(str, current_location))
        
        text = "/* Code generated by Beremiz c_ext confnode */\n\n"
        
        # Adding includes
        text += "/* User includes */\n"
        text += self.CFile.includes.gettext()
        text += "\n"
        
        text += """/* Beremiz c_ext confnode includes */
#ifdef _WINDOWS_H
  #include "iec_types.h"
#else
  #include "iec_std_lib.h"
#endif

"""

        # Adding variables
        vars = []
        inputs = memories = outputs = 0
        for variable in self.CFile.variables.variable:
            var = {"Name" : variable.getname(), "Type" : variable.gettype()}
            if variable.getclass() == "input":
                var["location"] = "__I%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, inputs)
                inputs += 1
            elif variable.getclass() == "memory":
                var["location"] = "__M%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, memories)
                memories += 1
            else:
                var["location"] = "__Q%s%s_%d"%(self.GetSizeOfType(var["Type"]), location_str, outputs)
                outputs += 1
            vars.append(var)
        text += "/* Beremiz c_ext confnode user variables definition */\n"
        base_types = self.GetCTRoot().GetBaseTypes()
        for var in vars:
            if var["Type"] in base_types:
                prefix = "IEC_"
            else:
                prefix = ""
            text += "%s%s beremiz%s;\n"%(prefix, var["Type"], var["location"])
            text += "%s%s *%s = &beremiz%s;\n"%(prefix, var["Type"], var["location"], var["location"])
        text += "/* User variables reference */\n"
        for var in vars:
            text += "#define %s beremiz%s\n"%(var["Name"], var["location"])
        text += "\n"
        
        # Adding user global variables and routines
        text += "/* User internal user variables and routines */\n"
        text += self.CFile.globals.gettext()
        
        # Adding Beremiz confnode functions
        text += "/* Beremiz confnode functions */\n"
        text += "int __init_%s(int argc,char **argv)\n{\n"%location_str
        text += self.CFile.initFunction.gettext()
        text += "  return 0;\n"
        text += "\n}\n\n"
        
        text += "void __cleanup_%s(void)\n{\n"%location_str
        text += self.CFile.cleanUpFunction.gettext()
        text += "\n}\n\n"
        
        text += "void __retrieve_%s(void)\n{\n"%location_str
        text += self.CFile.retrieveFunction.gettext()
        text += "\n}\n\n"
        
        text += "void __publish_%s(void)\n{\n"%location_str
        text += self.CFile.publishFunction.gettext()
        text += "\n}\n\n"
        
        Gen_Cfile_path = os.path.join(buildpath, "CFile_%s.c"%location_str)
        cfile = open(Gen_Cfile_path,'w')
        cfile.write(text)
        cfile.close()
        
        matiec_flags = '"-I%s"'%os.path.abspath(self.GetCTRoot().GetIECLibPath())
        
        return [(Gen_Cfile_path, str(self.CExtension.getCFLAGS() + matiec_flags))],str(self.CExtension.getLDFLAGS()),True


#-------------------------------------------------------------------------------
#                      Current Buffering Management Functions
#-------------------------------------------------------------------------------

    """
    Return a copy of the cfile model
    """
    def Copy(self, model):
        return cPickle.loads(cPickle.dumps(model))

    def CreateCFileBuffer(self, saved):
        self.Buffering = False
        self.CFileBuffer = UndoBuffer(cPickle.dumps(self.CFile), saved)

    def BufferCFile(self):
        self.CFileBuffer.Buffering(cPickle.dumps(self.CFile))
    
    def StartBuffering(self):
        self.Buffering = True
        
    def EndBuffering(self):
        if self.Buffering:
            self.CFileBuffer.Buffering(cPickle.dumps(self.CFile))
            self.Buffering = False
    
    def MarkCFileAsSaved(self):
        self.EndBuffering()
        self.CFileBuffer.CurrentSaved()
    
    def CFileIsSaved(self):
        return self.CFileBuffer.IsCurrentSaved() and not self.Buffering
        
    def LoadPrevious(self):
        self.EndBuffering()
        self.CFile = cPickle.loads(self.CFileBuffer.Previous())
    
    def LoadNext(self):
        self.CFile = cPickle.loads(self.CFileBuffer.Next())
    
    def GetBufferState(self):
        first = self.CFileBuffer.IsFirst() and not self.Buffering
        last = self.CFileBuffer.IsLast()
        return not first, not last