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#!/usr/bin/env python

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

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#This file is part of Beremiz, a Integrated Development Environment for

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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 

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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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import ctypes

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from LPCAppProto import *

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from LPCObject import *

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from targets.typemapping import  LogLevelsCount, TypeTranslator, UnpackDebugBuffer

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class LPCAppObject(LPCObject):

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    def connect(self,comport):

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        self.SerialConnection = LPCAppProto(comport,#number

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                                         115200, #speed

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                                         5)      #timeout

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    def StartPLC(self, debug=False):

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        self.HandleSerialTransaction(STARTTransaction())

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    def StopPLC(self):

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        self.HandleSerialTransaction(STOPTransaction())

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        return True

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    def ResetPLC(self):

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        self.HandleSerialTransaction(RESETTransaction())

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        return self.PLCStatus

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    def GetPLCstatus(self):

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        strcounts = self.HandleSerialTransaction(GET_LOGCOUNTSTransaction())

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        if strcounts is not None and len(strcounts) == LogLevelsCount * 4:

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            cstrcounts = ctypes.create_string_buffer(strcounts)

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            ccounts = ctypes.cast(cstrcounts, ctypes.POINTER(ctypes.c_uint32))

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            counts = [int(ccounts[idx]) for idx in xrange(LogLevelsCount)]

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        else :

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            counts = [0]*LogLevelsCount

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        return self.PLCStatus, counts 

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    def MatchMD5(self, MD5):

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        data = self.HandleSerialTransaction(GET_PLCIDTransaction())

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        if data is not None:

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            return data[:32] == MD5[:32]

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        return False

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    def SetTraceVariablesList(self, idxs):

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        """

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        Call ctype imported function to append 

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        these indexes to registred variables in PLC debugger

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        """

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        if idxs:

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            buff = ""

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            # keep a copy of requested idx

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            self._Idxs = idxs[:]

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            for idx,iectype,force in idxs:

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                idxstr = ctypes.string_at(

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                          ctypes.pointer(

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                           ctypes.c_uint32(idx)),4)

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                if force !=None:

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                    c_type,unpack_func, pack_func = TypeTranslator.get(iectype, (None,None,None))

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                    forced_type_size = ctypes.sizeof(c_type)

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                    forced_type_size_str = chr(forced_type_size)

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                    forcestr = ctypes.string_at(

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                                ctypes.pointer(

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                                 pack_func(c_type,force)),

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                                 forced_type_size)

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                    buff += idxstr + forced_type_size_str + forcestr

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                else:

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                    buff += idxstr + chr(0)

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        else:

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            buff = ""

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            self._Idxs =  []

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        self.HandleSerialTransaction(SET_TRACE_VARIABLETransaction(buff))

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    def GetTraceVariables(self):

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        """

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        Return a list of variables, corresponding to the list of required idx

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        """

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        strbuf = self.HandleSerialTransaction(

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                                     GET_TRACE_VARIABLETransaction())

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        if strbuf is not None and len(strbuf) > 4 and self.PLCStatus == "Started":

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            size = len(strbuf) - 4

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            ctick = ctypes.create_string_buffer(strbuf[:4])

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            tick = ctypes.cast(ctick, ctypes.POINTER(ctypes.c_int)).contents

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            cbuff = ctypes.create_string_buffer(strbuf[4:])

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            buff = ctypes.cast(cbuff, ctypes.c_void_p)

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            TraceVariables = UnpackDebugBuffer(buff, size,  self._Idxs)

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            if TraceVariables is not None:

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                return self.PLCStatus, tick.value, TraceVariables

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        return self.PLCStatus, None, [] 

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    def GetLogMessage(self, level, msgid):

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        strbuf = self.HandleSerialTransaction(GET_LOGMSGTransaction(level, msgid))

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        if strbuf is not None and len(strbuf) > 12:

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            cbuf = ctypes.cast(

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                          ctypes.c_char_p(strbuf[:12]),

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                          ctypes.POINTER(ctypes.c_uint32))

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            return (strbuf[12:],)+tuple(int(cbuf[idx]) for idx in range(3))

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        return None