#!/usr/bin/python

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

""" Import externals """
import wx
import wx.lib.newevent
import os
import sys
import re
import threading
import StringIO

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

""" Import scyther components """
import XMLReader

""" Import scyther-gui components """
import Tempfile
import Claim
import Preference
import Scyther
import Attackwindow

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

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

class ScytherThread(threading.Thread):

    """ The reason this is a thread is because we might to decide to
    abort it. However, apparently Python has no good support for killing
    threads yet :( """

    # Override Thread's __init__ method to accept the parameters needed:
    def __init__ ( self, parent ):

        self.parent = parent
        parent.verified = False
        parent.claims = []

        threading.Thread.__init__ ( self )

    def run(self):

        self.claimResults()

        # Results are done (claimstatus can be reported)

        # Shoot down the verification window and let the RunScyther function handle the rest
        self.parent.verified = True
        self.parent.verifywin.Close()

    def claimResults(self):
        """ Convert spdl to result (using Scyther)
        """

        scyther = Scyther.Scyther()
        
        scyther.options = self.parent.options

        scyther.setInput(self.parent.spdl)
        self.parent.claims = scyther.verify()
        self.parent.summary = str(scyther)

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

class AttackThread(threading.Thread):

    """ This is a thread because it computes images from stuff in the
    background """

    # Override Thread's __init__ method to accept the parameters needed:
    def __init__ ( self, parent, resultwin ):

        self.parent = parent
        self.resultwin = resultwin

        threading.Thread.__init__ ( self )

    def run(self):

        # create the images in the background
        self.makeImages()

    def makeImages(self):
        """ create images """
        for cl in self.parent.claims:
            for attack in cl.attacks:
                self.makeImage(attack)
            if cl.button and len(cl.attacks) > 0:
                cl.button.Enable()

    def makeImage(self,attack):
        """ create image for this particular attack """

        (fd2,fpname2) = Tempfile.tempcleaned(".png")
        pw,pr = os.popen2("dot -Tpng -o%s" % (fpname2))
        pw.write(attack.scytherDot)
        pw.close()
        pr.close()
        attack.pngfile = fpname2  # this is where the file name is stored

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

class VerificationWindow(wx.Dialog):
    def __init__(
            self, parent, ID, title, pos=wx.DefaultPosition, size=wx.DefaultSize, 
            style=wx.DEFAULT_DIALOG_STYLE
            ):

        wx.Dialog.__init__(self,parent,ID,title,pos,size,style)

        sizer = wx.BoxSizer(wx.VERTICAL)

        label = wx.StaticText(self, -1, "Verifying protocol description")
        sizer.Add(label, 0, wx.ALIGN_CENTRE|wx.ALL, 5)

        line = wx.StaticLine(self, -1, size=(20,-1), style=wx.LI_HORIZONTAL)
        sizer.Add(line, 0, wx.GROW|wx.ALIGN_CENTER_VERTICAL|wx.RIGHT|wx.TOP, 5)

        btnsizer = wx.StdDialogButtonSizer()
        
        btn = wx.Button(self, wx.ID_CANCEL)
        btnsizer.AddButton(btn)
        btnsizer.Realize()

        sizer.Add(btnsizer, 0, wx.ALIGN_CENTER_VERTICAL|wx.ALL, 5)

        self.SetSizer(sizer)
        sizer.Fit(self)

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

class ResultWindow(wx.Frame):

    def __init__(
            self, parent, parentwindow, title, pos=wx.DefaultPosition, size=wx.DefaultSize, 
            style=wx.DEFAULT_DIALOG_STYLE
            ):

        self.parent = parent
        
        wx.Frame.__init__(self,parentwindow,-1,title,pos,size,style)

        self.thread = None
        self.Bind(wx.EVT_CLOSE, self.onCloseWindow)

        self.BuildTable()


    def onViewButton(self,evt):
        btn = evt.GetEventObject()
        (y,x) = self.grid.GetItemPosition(btn)
        n = len(self.parent.claims)
        cln = n-y
        cl = self.parent.claims[cln]
        w = Attackwindow.AttackWindow(cl)

    def onCloseWindow(self,evt):
        # TODO we should kill self.thread

        # Clean up
        for cl in self.parent.claims:
            if cl.pngfile:
                os.unlink(cl.pngfile)
                cl.pngfile = None
        self.parent.claims = None

        self.Destroy()


    def BuildTable(self):
        # Now continue with the normal construction of the dialog
        # contents
        sizer = wx.BoxSizer(wx.VERTICAL)

        # For these claims...
        claims = self.parent.claims

        # set up grid
        self.grid = grid = wx.GridBagSizer(7,1+len(claims))

        def titlebar(x,title,width=1):
            txt = wx.StaticText(self,-1,title)
            font = wx.Font(14,wx.NORMAL,wx.NORMAL,wx.NORMAL)
            txt.SetFont(font)
            grid.Add(txt,(0,x),(1,width))

        titlebar(0,"Claim",5)
        if len(claims) > 0:
            sn = claims[0].stateName(2)
            resulttxt = sn[0].upper() + sn[1:]
        else:
            resultxt = "Results"
        titlebar(5,resulttxt,2)

        self.lastprot = None
        self.lastrole = None
        for index in range(0,len(claims)):
            # we reverse the display order of the claims!
            cl = claims[len(claims)-index-1]
            self.BuildClaim(grid,cl,index+1)

        sizer.Add(grid, 0,wx.ALIGN_CENTRE|wx.ALL,5)

        self.SetSizer(sizer)
        sizer.Fit(self)

    def BuildClaim(self,grid,cl,ypos):
        # a support function
        def addtxt(txt,column):
            grid.Add(wx.StaticText(self,-1,txt),(ypos,column),(1,1),wx.ALIGN_CENTER_VERTICAL)

        # button for ok/fail
        tsize = (16,16)
        if cl.okay:
            bmp = wx.ArtProvider_GetBitmap(wx.ART_TICK_MARK,wx.ART_CMN_DIALOG,tsize)
        else:
            bmp = wx.ArtProvider_GetBitmap(wx.ART_CROSS_MARK,wx.ART_CMN_DIALOG,tsize)
        if not bmp.Ok():
            bmp = wx.EmptyBitmap(tsize)
        bmpfield = wx.StaticBitmap(self,-1,bmp)

        grid.Add(bmpfield,(ypos,0),(1,1),wx.ALIGN_CENTER_VERTICAL)

        # protocol, role, label
        prot = str(cl.protocol)
        showPR = False
        if prot != self.lastprot:
            self.lastprot = prot
            showPR = True
        role = str(cl.role)
        if role != self.lastrole:
            self.lastrole = role
            showPR = True
        if showPR:
            addtxt(prot,1)
            addtxt(role,2)
        
        addtxt(str(cl.shortlabel),3)

        claimdetails = str(cl.claimtype)
        if cl.parameter:
            claimdetails += " %s  " % (cl.parameter)
        addtxt(claimdetails,4)

        # add view button (if needed)
        n = len(cl.attacks)
        cl.button = wx.Button(self,-1,"%i %s" % (n,cl.stateName(n)))
        grid.Add(cl.button,(ypos,5),(1,1),wx.ALIGN_CENTER_VERTICAL)
        cl.button.Disable()
        if n > 0:
            # Aha, something to show
            self.Bind(wx.EVT_BUTTON, self.onViewButton,cl.button)

        # remark something about completeness
        remark = ""
        if not cl.complete:
            if n == 0:
                # no attacks, no states within bounds
                remark = "within bounds"
            else:
                # some attacks/states within bounds
                remark = "at least, maybe more"
        else:
            if n == 0:
                # no attacks, no states
                remark = "none"
            else:
                # there exist n states/attacks (within any number of runs)
                remark = "exactly"
        addtxt(" (%s)" % remark,6)
                

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


class ScytherRun(object):
    def __init__(self,mainwin,mode):

        self.mainwin = mainwin
        self.mode = mode
        self.spdl = mainwin.control.GetValue()

        # Verification window

        self.verifywin = verifywin = VerificationWindow(mainwin,-1,mode)
        verifywin.CenterOnScreen()
        verifywin.Show(True)

        # start the thread
        
        self.options = mainwin.settings.ScytherArguments(mode)
        self.verified = False
        verifywin.SetCursor(wx.StockCursor(wx.CURSOR_WAIT))

        t = ScytherThread(self)
        t.start()

        # start the window and show until something happens
        # if it terminates, this is a cancel, and should also kill the thread. (what happens to a spawned Scyther in that case?)
        # if the thread terminames, it should close the window normally, and we end up here as well.

        val = verifywin.ShowModal()

        # Cursor back to normal
        verifywin.SetCursor(wx.StockCursor(wx.CURSOR_ARROW))

        if self.verified:
            # Great, we verified stuff, progress to the claim report
            title = "Scyther results : %s" % mode
            self.resultwin = resultwin = ResultWindow(self,mainwin,title)
            resultwin.Show(1)

            t = AttackThread(self,resultwin)
            t.start()

            resultwin.thread = t
            resultwin.CenterOnScreen()
            resultwin.Show(True)

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