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# PlcOpenXmlLadderToAsciiLadder
import sys
import xml.dom.minidom

def howCloseAmIToLeftPowerRail(num, ladder, element):
    # Function to work out how close an element is to the left...
    # element is a dom element of contact, coil, block
    # ladder is the whole ladder
    # num is the current distance, initially zero
    if element.tagName == "contact" or element.tagName == "coil" or element.tagName == "leftPowerRail":
        _num = num + 1
    else: # "block", maybe "execute"?
        _num = num + 3
    highestnum = _num
    for conny in element.getElementsByTagName("connection"):
        for _elly in ladder.childNodes:
            if _elly.nodeType != _elly.TEXT_NODE:
                if _elly.getAttribute("localId") == conny.getAttribute("refLocalId"):
                    # pass how close this element is
                    connysNum = howCloseAmIToLeftPowerRail(_num, ladder, _elly)
        if connysNum > highestnum:
            highestnum = connysNum
    return highestnum

# main
if len(sys.argv) == 2:
    filepathin = sys.argv[1]
    print(filepathin)
    doc = xml.dom.minidom.parse(filepathin)
    # get the first (currently only) entire declaration header as a string
    declarationheader = doc.getElementsByTagName("InterfaceAsPlainText")[0].getElementsByTagName("xhtml")[0].childNodes[0].data
    
    # get the first (currently only) ladder element
    ladder = doc.getElementsByTagName("LD")[0]
    widthOfLadder = 4 # will grow by itself if the ladder needs it
    foundANewLabel = False
    networkNumber = 0
    rowId = 0
  
    gridladder = xml.dom.minidom.Document()
    gridladder.appendChild(gridladder.createElement("gridLD"))
  
    for elly in ladder.childNodes:
        #Close a branch
        #     <contact>
        #        <connectionPointIn>
        #          <connection refLocalId="39" />
        #          <connection refLocalId="40" />
        #        </connectionPointIn>
        #Open a branch
        #      <contact >        
        #        <connectionPointIn>
        #          <connection refLocalId="0" />
        #        </connectionPointIn>
        #      </contact>
        #      <contact >
        #        <connectionPointIn>
        #          <connection refLocalId="0" />
        #        </connectionPointIn>
        #leftPowerRail
        #comment
        #label
        if elly.nodeName == "label":
            print(elly.getAttribute("label"))
            # create new <row>, add this label to the zeroth column
            networkNumber += 1
            gridladder.firstChild.appendChild(gridladder.createElement("row"))
            gridladder.firstChild.lastChild.setAttribute("rowId",str(rowId))
            rowId += 1
            gridladder.firstChild.lastChild.appendChild(gridladder.createElement("Column"))
            gridladder.firstChild.lastChild.lastChild.setAttribute("columnId","0")
            gridladder.firstChild.lastChild.lastChild.setAttribute("networkId",str(networkNumber))
            gridladder.firstChild.lastChild.lastChild.setAttribute("label",elly.getAttribute("label"))
            foundANewLabel = True
        #vendorElement  (both new network and parallel branches)
        if elly.nodeName == "vendorElement":
            if elly.getElementsByTagName("ElementType").length > 0:
                print("NewNetwork")
                if foundANewLabel:# already found a label
                    foundANewLabel = False
                else:
                    networkNumber += 1
                    gridladder.firstChild.appendChild(gridladder.createElement("row"))
                    gridladder.firstChild.lastChild.setAttribute("rowId",str(rowId))
                    rowId += 1
                    
                    gridladder.firstChild.lastChild.appendChild(gridladder.createElement("Column"))
                    gridladder.firstChild.lastChild.lastChild.setAttribute("columnId","0")
                    gridladder.firstChild.lastChild.lastChild.setAttribute("networkId",str(networkNumber))
            elif elly.getElementsByTagName("ParallelBranch"):
                print("New ParallelBranch Short Circuit")
        #inVariable (these are your inputs to blocks)
        if elly.nodeName == "inVariable":
            print("NewInvariable")
        #block (FB, F etc)
        if elly.nodeName == "block":
            print("NewBlock")
            mydistance = howCloseAmIToLeftPowerRail(0,ladder,elly)
            if mydistance > widthOfLadder:
                widthOfLadder = mydistance
  
            if elly.getElementsByTagName("connection")[0].getAttribute("refLocalId") == "0":
                # that means it's leftmost object
                if gridladder.firstChild.lastChild.lastChild.getAttribute("columnId") != "0":
                    # that means we parallel branch and need a new row
                    gridladder.firstChild.appendChild(gridladder.createElement("row"))
                    gridladder.firstChild.lastChild.setAttribute("rowId",str(rowId))
                    rowId += 1
                gridladder.firstChild.lastChild.appendChild(gridladder.createElement("Column"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("columnId","1")
                gridladder.firstChild.lastChild.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("width","3")
            else: # that means it points behind another object
                highestRowId = "65535"
                widestColumn = "0"
                for ellysUpstream in elly.getElementsByTagName("connection"):
                    # may be more than one upstream. 
                    # The first downstream will be in the highest row of the upstream and one column back from the furthest back upstream
                    ellysUpstreamId = ellysUpstream.getAttribute("refLocalId")
                    for gridellys in gridladder.firstChild.getElementsByTagName("Column"):
                        if gridellys.getAttribute("localId") == ellysUpstreamId:
                            if highestRowId > gridellys.parentNode.getAttribute("rowId"):
                                highestRowId = gridellys.parentNode.getAttribute("rowId")
                                highestRow = gridellys.parentNode
                            widestColumn = max(widestColumn, str(int(gridellys.getAttribute("columnId")) + int(gridellys.getAttribute("width"))))
                # Is there anyone at that RowColumn?
                someoneIsThereAlready = False
                for existingColumns in highestRow.getElementsByTagName("Column"):
                    if existingColumns.getAttribute("columnId") >= widestColumn:
                        someoneIsThereAlready = True
                if not someoneIsThereAlready :
                    highestRow.appendChild(gridladder.createElement("Column"))
                    highestRow.lastChild.setAttribute("columnId",widestColumn)
                    highestRow.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                    highestRow.lastChild.setAttribute("width","3")
                # TODO Do something else if someone is already there
                # TODO You will have to flag that it is parallel
        #contact
        if elly.nodeName == "contact":
            if elly.getAttribute("negated") == "true":
                print("NewNegatedContact")
            else:
                print("NewContact")
  
            mydistance = howCloseAmIToLeftPowerRail(0,ladder,elly)
            if mydistance > widthOfLadder:
                widthOfLadder = mydistance
  
            if elly.getElementsByTagName("connection")[0].getAttribute("refLocalId") == "0":
                # that means it's leftmost object
                if gridladder.firstChild.lastChild.lastChild.getAttribute("columnId") != "0":
                    # that means we parallel branch and need a new row
                    gridladder.firstChild.appendChild(gridladder.createElement("row"))
                    gridladder.firstChild.lastChild.setAttribute("rowId",str(rowId))
                    rowId += 1
                gridladder.firstChild.lastChild.appendChild(gridladder.createElement("Column"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("columnId","1")
                gridladder.firstChild.lastChild.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("width","1")
            else: # that means it points behind another object
                highestRowId = "65535"
                widestColumn = "0"
                for ellysUpstream in elly.getElementsByTagName("connection"):
                    # may be more than one upstream. 
                    # The first downstream will be in the highest row of the upstream and one column back from the furthest back upstream
                    ellysUpstreamId = ellysUpstream.getAttribute("refLocalId")
                    for gridellys in gridladder.firstChild.getElementsByTagName("Column"):
                        if gridellys.getAttribute("localId") == ellysUpstreamId:
                            if highestRowId > gridellys.parentNode.getAttribute("rowId"):
                                highestRowId = gridellys.parentNode.getAttribute("rowId")
                                highestRow = gridellys.parentNode
                            widestColumn = max(widestColumn, str(int(gridellys.getAttribute("columnId")) + int(gridellys.getAttribute("width"))))
                # Is there anyone at that RowColumn?
                someoneIsThereAlready = False
                for existingColumns in highestRow.getElementsByTagName("Column"):
                    if existingColumns.getAttribute("columnId") >= widestColumn:
                        someoneIsThereAlready = True
                if not someoneIsThereAlready :
                    highestRow.appendChild(gridladder.createElement("Column"))
                    highestRow.lastChild.setAttribute("columnId",widestColumn)
                    highestRow.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                    highestRow.lastChild.setAttribute("width","1")
                # TODO Do something else if someone is already there
                # TODO You will have to flag that it is parallel


  
        #coil
        if elly.nodeName == "coil":
            if elly.getAttribute("storage") == "none":
                print("NewCoil")
            elif elly.getAttribute("storage") == "set":
                print("NewSetCoil")
            elif elly.getAttribute("storage") == "reset":
                print("NewResetCoil")
            
            mydistance = howCloseAmIToLeftPowerRail(0,ladder,elly)
            if mydistance > widthOfLadder:
                widthOfLadder = mydistance
  
            if elly.getElementsByTagName("connection")[0].getAttribute("refLocalId") == "0":
                # that means it's leftmost object
                if gridladder.firstChild.lastChild.lastChild.getAttribute("columnId") != "0":
                    # that means we parallel branch and need a new row
                    gridladder.firstChild.appendChild(gridladder.createElement("row"))
                    gridladder.firstChild.lastChild.setAttribute("rowId",str(rowId))
                    rowId += 1
                gridladder.firstChild.lastChild.appendChild(gridladder.createElement("Column"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("columnId","1")
                gridladder.firstChild.lastChild.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                gridladder.firstChild.lastChild.lastChild.setAttribute("width","1")
            else: # that means it points behind another object
                highestRowId = "65535"
                widestColumn = "0"
                for ellysUpstream in elly.getElementsByTagName("connection"):
                    # may be more than one upstream. 
                    # The first downstream will be in the highest row of the upstream and one column back from the furthest back upstream
                    ellysUpstreamId = ellysUpstream.getAttribute("refLocalId")
                    for gridellys in gridladder.firstChild.getElementsByTagName("Column"):
                        if gridellys.getAttribute("localId") == ellysUpstreamId:
                            if highestRowId > gridellys.parentNode.getAttribute("rowId"):
                                highestRowId = gridellys.parentNode.getAttribute("rowId")
                                highestRow = gridellys.parentNode
                            widestColumn = max(widestColumn, str(int(gridellys.getAttribute("columnId")) + int(gridellys.getAttribute("width"))))
                # Is there anyone at that RowColumn?
                someoneIsThereAlready = False
                for existingColumns in highestRow.getElementsByTagName("Column"):
                    if existingColumns.getAttribute("columnId") >= widestColumn:
                        someoneIsThereAlready = True
                if not someoneIsThereAlready :
                    highestRow.appendChild(gridladder.createElement("Column"))
                    highestRow.lastChild.setAttribute("columnId",widestColumn)
                    highestRow.lastChild.setAttribute("localId",elly.getAttribute("localId"))
                    highestRow.lastChild.setAttribute("width","1")
                # TODO Do something else if someone is already there
                # TODO You will have to flag that it is parallel

        #rightPowerRail (think CODESYS were having a laugh)
    # How wide to make network? well:
    # 1. contacts and coils = 1
    # 2. blocks and executes = 3
    # 3. branches themselves don't take up additional room
    # 4. but... you have to work out the longest path on each branch
    # Data is presented localId + refLocalId [+ refLocalId + ...]
    # So I guess it is easiest to work our way backwards.  (from right to left)
    # We will naïvely look at every localId and how long it takes to get back to refLocalId=0
    # We also naïvely look at every possible localId, even if we've already found him
    # We've actually already calculated that above, yay for me!
    print(widthOfLadder)
  
    # Array of networks
    # Network is an array of Contact / Block / Coil
    # So we know it is (widthOfLadder) wide... so we could have an array.. no that's not right
    # 1. Pass through every element
    # 2. hmm, lets make a new ladder xml, which is the rows... input variables and labels can be added last
    # 3. <Row>
    #       <Column columnId="0" refLocalId=(localID of vendorElement new network) />
    #       <Column columnId="1" refLocalId=(localID of next contact/block/coil) />
    # 4. The next element comes in. It asks if anybody already has the row right behind its refLocalId
    #     If someone is already there, it starts a new Row, starting at the columnId just behind
    # 5. If it has two refLocalIds, it tries to get the furthest back column
    print (str(gridladder.toprettyxml()))
  
    # should now have a declaration section
    # a bunch of inputs
    # a bunch of outputs
    # and a bunch of blocks
    # convert them all to a nice easy format
    print ("{Declaration}")
    print (declarationheader)
    print ("{/Declaration}")
else:
    print("Maybe I want one argument, whch is the PLCOPEN XML.")
    print("Will output to current directory as Ladder0.ladder")