Geografic-Information-System/gui/wxpython/gmodeler/frame.py

"""!
@package gmodeler.frame

@brief wxGUI Graphical Modeler for creating, editing, and managing models

Classes:
 - frame::ModelFrame
 - frame::ModelCanvas
 - frame::ModelEvtHandler
 - frame::VariablePanel
 - frame::ItemPanel
 - frame::PythonPanel

(C) 2010-2012 by the GRASS Development Team

This program is free software under the GNU General Public License
(>=v2). Read the file COPYING that comes with GRASS for details.

@author Martin Landa <landa.martin gmail.com>
"""

import os
import sys
import time
import stat
import textwrap
import tempfile
import copy
import re

if __name__ == "__main__":
    sys.path.append(os.path.join(os.getenv('GISBASE'), 'etc', 'gui', 'wxpython'))

import wx
from   wx.lib import ogl
import wx.lib.flatnotebook    as FN

from core                 import globalvar
from gui_core.widgets     import GNotebook
from gui_core.goutput     import GMConsole, PyStc
from core.debug           import Debug
from core.gcmd            import GMessage, GException, GWarning, GError, RunCommand
from gui_core.dialogs     import GetImageHandlers
from gui_core.preferences import PreferencesBaseDialog
from core.settings        import UserSettings
from core.menudata        import MenuData
from gui_core.menu        import Menu
from gmodeler.menudata    import ModelerData
from gui_core.forms       import GUI
from gmodeler.preferences import PreferencesDialog, PropertiesDialog
from gmodeler.toolbars    import ModelerToolbar

from gmodeler.model       import *
from gmodeler.dialogs     import *

from grass.script import core as grass

class ModelFrame(wx.Frame):
    def __init__(self, parent, id = wx.ID_ANY,
                 title = _("GRASS GIS Graphical Modeler"), **kwargs):
        """!Graphical modeler main window
        
        @param parent parent window
        @param id window id
        @param title window title

        @param kwargs wx.Frames' arguments
        """
        self.parent = parent
        self.searchDialog = None # module search dialog
        self.baseTitle = title
        self.modelFile = None    # loaded model
        self.modelChanged = False
        
        self.cursors = {
            "default" : wx.StockCursor(wx.CURSOR_ARROW),
            "cross"   : wx.StockCursor(wx.CURSOR_CROSS),
            }
        
        wx.Frame.__init__(self, parent = parent, id = id, title = title, **kwargs)
        self.SetName("Modeler")
        self.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass.ico'), wx.BITMAP_TYPE_ICO))
        
        self.menubar = Menu(parent = self, data = ModelerData())
        
        self.SetMenuBar(self.menubar)
        
        self.toolbar = ModelerToolbar(parent = self)
        self.SetToolBar(self.toolbar)
        
        self.statusbar = self.CreateStatusBar(number = 1)
        
        self.notebook = GNotebook(parent = self,
                                  style = FN.FNB_FANCY_TABS | FN.FNB_BOTTOM |
                                  FN.FNB_NO_NAV_BUTTONS | FN.FNB_NO_X_BUTTON)
        
        self.canvas = ModelCanvas(self)
        self.canvas.SetBackgroundColour(wx.WHITE)
        self.canvas.SetCursor(self.cursors["default"])
        
        self.model = Model(self.canvas)
        
        self.variablePanel = VariablePanel(parent = self)
        
        self.itemPanel = ItemPanel(parent = self)
        
        self.pythonPanel = PythonPanel(parent = self)
        
        self.goutput = GMConsole(parent = self, frame = self, notebook = self.notebook)
        
        self.notebook.AddPage(page = self.canvas, text=_('Model'), name = 'model')
        self.notebook.AddPage(page = self.itemPanel, text=_('Items'), name = 'items')
        self.notebook.AddPage(page = self.variablePanel, text=_('Variables'), name = 'variables')
        self.notebook.AddPage(page = self.pythonPanel, text=_('Python editor'), name = 'python')
        self.notebook.AddPage(page = self.goutput, text=_('Command output'), name = 'output')
        wx.CallAfter(self.notebook.SetSelectionByName, 'model')
        wx.CallAfter(self.ModelChanged, False)

        self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)
        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.notebook.Bind(FN.EVT_FLATNOTEBOOK_PAGE_CHANGED, self.OnPageChanged)
        
        self._layout()
        self.SetMinSize((640, 300))
        self.SetSize((800, 600))
        
        # fix goutput's pane size
        if self.goutput:
            self.goutput.SetSashPosition(int(self.GetSize()[1] * .75))
        
    def _layout(self):
        """!Do layout"""
        sizer = wx.BoxSizer(wx.VERTICAL)

        sizer.Add(item = self.notebook, proportion = 1,
                  flag = wx.EXPAND)
        
        self.SetAutoLayout(True)
        self.SetSizer(sizer)
        sizer.Fit(self)
        
        self.Layout()

    def _addEvent(self, item):
        """!Add event to item"""
        evthandler = ModelEvtHandler(self.statusbar,
                                     self)
        evthandler.SetShape(item)
        evthandler.SetPreviousHandler(item.GetEventHandler())
        item.SetEventHandler(evthandler)

    def GetCanvas(self):
        """!Get canvas"""
        return self.canvas
    
    def GetModel(self):
        """!Get model"""
        return self.model
    
    def ModelChanged(self, changed = True):
        """!Update window title"""
        self.modelChanged = changed
        
        if self.modelFile:
            if self.modelChanged:
                self.SetTitle(self.baseTitle + " - " +  os.path.basename(self.modelFile) + '*')
            else:
                self.SetTitle(self.baseTitle + " - " +  os.path.basename(self.modelFile))
        else:
            self.SetTitle(self.baseTitle)

    def OnPageChanged(self, event):
        """!Page in notebook changed"""
        page = event.GetSelection()
        if page == self.notebook.GetPageIndexByName('python'):
            if self.pythonPanel.IsEmpty():
                self.pythonPanel.RefreshScript()
            
            if self.pythonPanel.IsModified():
                self.SetStatusText(_('Python script contains local modifications'), 0)
            else:
                self.SetStatusText(_('Python script is up-to-date'), 0)
        
        event.Skip()

    def OnVariables(self, event):
        """!Switch to variables page"""
        self.notebook.SetSelectionByName('variables')
        
    def OnRemoveItem(self, event):
        """!Remove shape
        """
        self.GetCanvas().RemoveSelected()
        
    def OnCanvasRefresh(self, event):
        """!Refresh canvas"""
        self.SetStatusText(_("Redrawing model..."), 0)
        self.GetCanvas().Refresh()
        self.SetStatusText("", 0)

    def OnCmdRun(self, event):
        """!Run command"""
        try:
            action = self.GetModel().GetItems()[event.pid]
            if hasattr(action, "task"):
                action.Update(running = True)
        except IndexError:
            pass
        
    def OnCmdPrepare(self, event):
        """!Prepare for running command"""
        if not event.userData:
            return
        
        event.onPrepare(item = event.userData['item'],
                        params = event.userData['params'])
        
    def OnCmdDone(self, event):
        """!Command done (or aborted)"""
        try:
            action = self.GetModel().GetItems()[event.pid]
            if hasattr(action, "task"):
                action.Update(running = True)
        except IndexError:
            pass
        
    def OnCloseWindow(self, event):
        """!Close window"""
        if self.modelChanged and \
                UserSettings.Get(group='manager', key='askOnQuit', subkey='enabled'):
            if self.modelFile:
                message = _("Do you want to save changes in the model?")
            else:
                message = _("Do you want to store current model settings "
                            "to model file?")
            
            # ask user to save current settings
            dlg = wx.MessageDialog(self,
                                   message = message,
                                   caption=_("Quit Graphical Modeler"),
                                   style = wx.YES_NO | wx.YES_DEFAULT |
                                   wx.CANCEL | wx.ICON_QUESTION | wx.CENTRE)
            ret = dlg.ShowModal()
            if ret == wx.ID_YES:
                if not self.modelFile:
                        self.OnWorkspaceSaveAs()
                else:
                    self.WriteModelFile(self.modelFile)
            elif ret == wx.ID_CANCEL:
                dlg.Destroy()
                return
            dlg.Destroy()
        
        self.Destroy()

    def OnSize(self, event):
        """Window resized, save to the model"""
        self.ModelChanged()
        event.Skip()
        
    def OnPreferences(self, event):
        """!Open preferences dialog"""
        dlg = PreferencesDialog(parent = self)
        dlg.CenterOnParent()
        
        dlg.ShowModal()
        self.canvas.Refresh()
        
    def OnHelp(self, event):
        """!Show help"""
        if self.parent and self.parent.GetName() == 'LayerManager':
            log = self.parent.GetLogWindow()
            log.RunCmd(['g.manual',
                        'entry=wxGUI.Modeler'])
        else:
            RunCommand('g.manual',
                       quiet = True,
                       entry = 'wxGUI.Modeler')
        
    def OnModelProperties(self, event):
        """!Model properties dialog"""
        dlg = PropertiesDialog(parent = self)
        dlg.CentreOnParent()
        properties = self.model.GetProperties()
        dlg.Init(properties)
        if dlg.ShowModal() == wx.ID_OK:
            self.ModelChanged()
            for key, value in dlg.GetValues().iteritems():
                properties[key] = value
            for action in self.model.GetItems(objType = ModelAction):
                action.GetTask().set_flag('overwrite', properties['overwrite'])
        
        dlg.Destroy()
        
    def OnDeleteData(self, event):
        """!Delete intermediate data"""
        rast, vect, rast3d, msg = self.model.GetIntermediateData()
        
        if not rast and not vect and not rast3d:
            GMessage(parent = self,
                     message = _('No intermediate data to delete.'))
            return
        
        dlg = wx.MessageDialog(parent = self,
                               message= _("Do you want to permanently delete data?%s" % msg),
                               caption=_("Delete intermediate data?"),
                               style=wx.YES_NO | wx.YES_DEFAULT | wx.ICON_QUESTION)
        
        ret = dlg.ShowModal()
        if ret == wx.ID_YES:
            dlg.Destroy()
            
            if rast:
                self.goutput.RunCmd(['g.remove', 'rast=%s' %','.join(rast)])
            if rast3d:
                self.goutput.RunCmd(['g.remove', 'rast3d=%s' %','.join(rast3d)])
            if vect:
                self.goutput.RunCmd(['g.remove', 'vect=%s' %','.join(vect)])
            
            self.SetStatusText(_("%d maps deleted from current mapset") % \
                                 int(len(rast) + len(rast3d) + len(vect)))
            return
        
        dlg.Destroy()
                
    def OnModelNew(self, event):
        """!Create new model"""
        Debug.msg(4, "ModelFrame.OnModelNew():")
        
        # ask user to save current model
        if self.modelFile and self.modelChanged:
            self.OnModelSave()
        elif self.modelFile is None and \
                (self.model.GetNumItems() > 0 or len(self.model.GetData()) > 0):
            dlg = wx.MessageDialog(self, message=_("Current model is not empty. "
                                                   "Do you want to store current settings "
                                                   "to model file?"),
                                   caption=_("Create new model?"),
                                   style=wx.YES_NO | wx.YES_DEFAULT |
                                   wx.CANCEL | wx.ICON_QUESTION)
            ret = dlg.ShowModal()
            if ret == wx.ID_YES:
                self.OnModelSaveAs()
            elif ret == wx.ID_CANCEL:
                dlg.Destroy()
                return
            
            dlg.Destroy()
        
        # delete all items
        self.canvas.GetDiagram().DeleteAllShapes()
        self.model.Reset()
        self.canvas.Refresh()
        self.itemPanel.Update()
        self.variablePanel.Reset()
        
        # no model file loaded
        self.modelFile = None
        self.modelChanged = False
        self.SetTitle(self.baseTitle)
        
    def OnModelOpen(self, event):
        """!Load model from file"""
        filename = ''
        dlg = wx.FileDialog(parent = self, message=_("Choose model file"),
                            defaultDir = os.getcwd(),
                            wildcard=_("GRASS Model File (*.gxm)|*.gxm"))
        if dlg.ShowModal() == wx.ID_OK:
            filename = dlg.GetPath()
                    
        if not filename:
            return
        
        Debug.msg(4, "ModelFrame.OnModelOpen(): filename=%s" % filename)
        
        # close current model
        self.OnModelClose()
        
        self.LoadModelFile(filename)
        
        self.modelFile = filename
        self.SetTitle(self.baseTitle + " - " +  os.path.basename(self.modelFile))
        self.SetStatusText(_('%(items)d items (%(actions)d actions) loaded into model') % \
                               { 'items' : self.model.GetNumItems(),
                                 'actions' : self.model.GetNumItems(actionOnly = True) }, 0)
        
    def OnModelSave(self, event = None):
        """!Save model to file"""
        if self.modelFile and self.modelChanged:
            dlg = wx.MessageDialog(self, message=_("Model file <%s> already exists. "
                                                   "Do you want to overwrite this file?") % \
                                       self.modelFile,
                                   caption=_("Save model"),
                                   style=wx.YES_NO | wx.YES_DEFAULT | wx.ICON_QUESTION)
            if dlg.ShowModal() == wx.ID_NO:
                dlg.Destroy()
            else:
                Debug.msg(4, "ModelFrame.OnModelSave(): filename=%s" % self.modelFile)
                self.WriteModelFile(self.modelFile)
                self.SetStatusText(_('File <%s> saved') % self.modelFile, 0)
                self.SetTitle(self.baseTitle + " - " +  os.path.basename(self.modelFile))
        elif not self.modelFile:
            self.OnModelSaveAs(None)
        
    def OnModelSaveAs(self, event):
        """!Create model to file as"""
        filename = ''
        dlg = wx.FileDialog(parent = self,
                            message = _("Choose file to save current model"),
                            defaultDir = os.getcwd(),
                            wildcard=_("GRASS Model File (*.gxm)|*.gxm"),
                            style=wx.FD_SAVE)
        
        
        if dlg.ShowModal() == wx.ID_OK:
            filename = dlg.GetPath()
        
        if not filename:
            return
        
        # check for extension
        if filename[-4:] != ".gxm":
            filename += ".gxm"
        
        if os.path.exists(filename):
            dlg = wx.MessageDialog(parent = self,
                                   message=_("Model file <%s> already exists. "
                                             "Do you want to overwrite this file?") % filename,
                                   caption=_("File already exists"),
                                   style=wx.YES_NO | wx.YES_DEFAULT | wx.ICON_QUESTION)
            if dlg.ShowModal() != wx.ID_YES:
                dlg.Destroy()
                return
        
        Debug.msg(4, "GMFrame.OnModelSaveAs(): filename=%s" % filename)
        
        self.WriteModelFile(filename)
        self.modelFile = filename
        self.SetTitle(self.baseTitle + " - " + os.path.basename(self.modelFile))
        self.SetStatusText(_('File <%s> saved') % self.modelFile, 0)

    def OnModelClose(self, event = None):
        """!Close model file"""
        Debug.msg(4, "ModelFrame.OnModelClose(): file=%s" % self.modelFile)
        # ask user to save current model
        if self.modelFile and self.modelChanged:
            self.OnModelSave()
        elif self.modelFile is None and \
                (self.model.GetNumItems() > 0 or len(self.model.GetData()) > 0):
            dlg = wx.MessageDialog(self, message=_("Current model is not empty. "
                                                   "Do you want to store current settings "
                                                   "to model file?"),
                                   caption=_("Create new model?"),
                                   style=wx.YES_NO | wx.YES_DEFAULT |
                                   wx.CANCEL | wx.ICON_QUESTION)
            ret = dlg.ShowModal()
            if ret == wx.ID_YES:
                self.OnModelSaveAs()
            elif ret == wx.ID_CANCEL:
                dlg.Destroy()
                return
            
            dlg.Destroy()
        
        self.modelFile = None
        self.SetTitle(self.baseTitle)
        
        self.canvas.GetDiagram().DeleteAllShapes()
        self.model.Reset()
        
        self.canvas.Refresh()
        
    def OnRunModel(self, event):
        """!Run entire model"""
        self.model.Run(self.goutput, self.OnDone, parent = self)
        
    def OnDone(self, cmd, returncode):
        """!Computation finished"""
        self.SetStatusText('', 0)
        # restore original files
        if hasattr(self.model, "fileInput"):
            for finput in self.model.fileInput:
                data = self.model.fileInput[finput]
                if not data:
                    continue
                
                fd = open(finput, "w")
                try:
                    fd.write(data)
                finally:
                    fd.close()
            del self.model.fileInput
        
    def OnValidateModel(self, event, showMsg = True):
        """!Validate entire model"""
        if self.model.GetNumItems() < 1:
            GMessage(parent = self, 
                     message = _('Model is empty. Nothing to validate.'))
            return
        
        
        self.SetStatusText(_('Validating model...'), 0)
        errList = self.model.Validate()
        self.SetStatusText('', 0)
        
        if errList:
            GWarning(parent = self,
                     message = _('Model is not valid.\n\n%s') % '\n'.join(errList))
        else:
            GMessage(parent = self,
                     message = _('Model is valid.'))
    
    def OnExportImage(self, event):
        """!Export model to image (default image)
        """
        xminImg = 0
        xmaxImg = 0
        yminImg = 0
        ymaxImg = 0
        # get current size of canvas
        for shape in self.canvas.GetDiagram().GetShapeList():
            w, h = shape.GetBoundingBoxMax()
            x    = shape.GetX()
            y    = shape.GetY()
            xmin = x - w / 2
            xmax = x + w / 2
            ymin = y - h / 2
            ymax = y + h / 2
            if xmin < xminImg:
                xminImg = xmin
            if xmax > xmaxImg:
                xmaxImg = xmax
            if ymin < yminImg:
                yminImg = ymin
            if ymax > ymaxImg:
                ymaxImg = ymax
        size = wx.Size(int(xmaxImg - xminImg) + 50,
                       int(ymaxImg - yminImg) + 50)
        bitmap = wx.EmptyBitmap(width = size.width, height = size.height)
        
        filetype, ltype = GetImageHandlers(wx.ImageFromBitmap(bitmap))
        
        dlg = wx.FileDialog(parent = self,
                            message = _("Choose a file name to save the image (no need to add extension)"),
                            defaultDir = "",
                            defaultFile = "",
                            wildcard = filetype,
                            style=wx.SAVE | wx.FD_OVERWRITE_PROMPT)
        
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            if not path:
                dlg.Destroy()
                return
            
            base, ext = os.path.splitext(path)
            fileType = ltype[dlg.GetFilterIndex()]['type']
            extType  = ltype[dlg.GetFilterIndex()]['ext']
            if ext != extType:
                path = base + '.' + extType
            
            dc = wx.MemoryDC(bitmap)
            dc.SetBackground(wx.WHITE_BRUSH)
            dc.SetBackgroundMode(wx.SOLID)
            
            dc.BeginDrawing()
            self.canvas.GetDiagram().Clear(dc)
            self.canvas.GetDiagram().Redraw(dc)
            dc.EndDrawing()
            
            bitmap.SaveFile(path, fileType)
            self.SetStatusText(_("Model exported to <%s>") % path)
        
        dlg.Destroy()
        
    def OnExportPython(self, event = None, text = None):
        """!Export model to Python script"""
        filename = self.pythonPanel.SaveAs(force = True)
        self.SetStatusText(_("Model exported to <%s>") % filename)

    def OnDefineRelation(self, event):
        """!Define relation between data and action items"""
        self.canvas.SetCursor(self.cursors["cross"])
        self.defineRelation = { 'from' : None,
                                'to'   : None }
        
    def OnDefineLoop(self, event):
        """!Define new loop in the model"""
        self.ModelChanged()
        
        width, height = self.canvas.GetSize()
        loop = ModelLoop(self, x = width/2, y = height/2,
                         id = self.model.GetNumItems() + 1)
        self.canvas.diagram.AddShape(loop)
        loop.Show(True)
        
        self._addEvent(loop)
        self.model.AddItem(loop)
        
        self.canvas.Refresh()
        
    def OnDefineCondition(self, event):
        """!Define new condition in the model"""
        self.ModelChanged()
        
        width, height = self.canvas.GetSize()
        cond = ModelCondition(self, x = width/2, y = height/2,
                              id = self.model.GetNumItems() + 1)
        self.canvas.diagram.AddShape(cond)
        cond.Show(True)
        
        self._addEvent(cond)
        self.model.AddItem(cond)
        
        self.canvas.Refresh()
    
    def OnAddAction(self, event):
        """!Add action to model"""
        if self.searchDialog is None:
            self.searchDialog = ModelSearchDialog(self)
            self.searchDialog.CentreOnParent()
        else:
            self.searchDialog.Reset()
        
        if self.searchDialog.ShowModal() == wx.ID_CANCEL:
            self.searchDialog.Hide()
            return
            
        cmd = self.searchDialog.GetCmd()
        self.searchDialog.Hide()
        
        self.ModelChanged()
        
        # add action to canvas
        x, y = self.canvas.GetNewShapePos()
        action = ModelAction(self.model, cmd = cmd, x = x, y = y,
                             id = self.model.GetNextId())
        overwrite = self.model.GetProperties().get('overwrite', None)
        if overwrite is not None:
            action.GetTask().set_flag('overwrite', overwrite)
        
        self.canvas.diagram.AddShape(action)
        action.Show(True)
        
        self._addEvent(action)
        self.model.AddItem(action)
        
        self.itemPanel.Update()
        self.canvas.Refresh()
        time.sleep(.1)
        
        # show properties dialog
        win = action.GetPropDialog()
        if not win:
            if action.IsValid():
                self.GetOptData(dcmd = action.GetLog(string = False), layer = action,
                                params = action.GetParams(), propwin = None)
            else:
                GUI(parent = self, show = True).ParseCommand(action.GetLog(string = False),
                                                             completed = (self.GetOptData, action, action.GetParams()))
        elif win and not win.IsShown():
            win.Show()
        
        if win:
            win.Raise()
        
    def OnAddData(self, event):
        """!Add data item to model
        """
        # add action to canvas
        width, height = self.canvas.GetSize()
        data = ModelData(self, x = width/2, y = height/2)
       
        dlg = ModelDataDialog(parent = self, shape = data)
        data.SetPropDialog(dlg)
        dlg.CentreOnParent()
        ret = dlg.ShowModal()
        dlg.Destroy()
        if ret != wx.ID_OK:
            return
        
        data.Update()
        self.canvas.diagram.AddShape(data)
        data.Show(True)
        
        self.ModelChanged()
        
        self._addEvent(data)
        self.model.AddItem(data)
        
        self.canvas.Refresh()
        
        
    def OnHelp(self, event):
        """!Display manual page"""
        grass.run_command('g.manual',
                          entry = 'wxGUI.Modeler')

    def OnAbout(self, event):
        """!Display About window"""
        info = wx.AboutDialogInfo()

        info.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass.ico'), wx.BITMAP_TYPE_ICO))
        info.SetName(_('wxGUI Graphical Modeler'))
        info.SetWebSite('http://grass.osgeo.org')
        year = grass.version()['date']
        info.SetDescription(_('(C) 2010-%s by the GRASS Development Team\n\n') % year + 
                            '\n'.join(textwrap.wrap(_('This program is free software under the GNU General Public License'
                                                      '(>=v2). Read the file COPYING that comes with GRASS for details.'), 75)))
        
        wx.AboutBox(info)
        
    def GetOptData(self, dcmd, layer, params, propwin):
        """!Process action data"""
        if params: # add data items
            width, height = self.canvas.GetSize()
            x = [width/2 + 200, width/2 - 200]
            for p in params['params']:
                if p.get('prompt', '') in ('raster', 'vector', 'raster3d') and \
                        (p.get('value', None) or \
                             (p.get('age', 'old') != 'old' and p.get('required', 'no') == 'yes')):
                    data = layer.FindData(p.get('name', ''))
                    if data:
                        data.SetValue(p.get('value', ''))
                        data.Update()
                        continue
                    
                    data = self.model.FindData(p.get('value', ''),
                                               p.get('prompt', ''))
                    if data:
                        if p.get('age', 'old') == 'old':
                            rel = ModelRelation(parent = self, fromShape = data,
                                                toShape = layer, param = p.get('name', ''))
                        else:
                            rel = ModelRelation(parent = self, fromShape = layer,
                                                toShape = data, param = p.get('name', ''))
                        layer.AddRelation(rel)
                        data.AddRelation(rel)
                        self.AddLine(rel)
                        data.Update()
                        continue
                    
                    data = ModelData(self, value = p.get('value', ''),
                                     prompt = p.get('prompt', ''),
                                     x = x.pop(), y = height/2)
                    self._addEvent(data)
                    self.canvas.diagram.AddShape(data)
                    data.Show(True)
                                                            
                    if p.get('age', 'old') == 'old':
                        rel = ModelRelation(parent = self, fromShape = data,
                                            toShape = layer, param = p.get('name', ''))
                    else:
                        rel = ModelRelation(parent = self, fromShape = layer,
                                            toShape = data, param = p.get('name', ''))
                    layer.AddRelation(rel)
                    data.AddRelation(rel)
                    self.AddLine(rel)
                    data.Update()
            
            # valid / parameterized ?
            layer.SetValid(params)
            
            self.canvas.Refresh()
        
        if dcmd:
            layer.SetProperties(params, propwin)
            
        self.SetStatusText(layer.GetLog(), 0)
        
    def AddLine(self, rel):
        """!Add connection between model objects
        
        @param rel relation
        """
        fromShape = rel.GetFrom()
        toShape   = rel.GetTo()
        
        rel.SetCanvas(self)
        rel.SetPen(wx.BLACK_PEN)
        rel.SetBrush(wx.BLACK_BRUSH)
        rel.AddArrow(ogl.ARROW_ARROW)
        points = rel.GetControlPoints()
        rel.MakeLineControlPoints(2)
        if points:
            for x, y in points:
                rel.InsertLineControlPoint(point = wx.RealPoint(x, y))
        
        self._addEvent(rel)
        try:
            fromShape.AddLine(rel, toShape)
        except TypeError:
            pass # bug when connecting ModelCondition and ModelLoop - to be fixed
        
        self.canvas.diagram.AddShape(rel)
        rel.Show(True)
        
    def LoadModelFile(self, filename):
        """!Load model definition stored in GRASS Model XML file (gxm)
        """
        try:
            self.model.LoadModel(filename)
        except GException, e:
            GError(parent = self,
                   message = _("Reading model file <%s> failed.\n"
                               "Invalid file, unable to parse XML document.") % filename)
        
        self.modelFile = filename
        self.SetTitle(self.baseTitle + " - " +  os.path.basename(self.modelFile))
        
        self.SetStatusText(_("Please wait, loading model..."), 0)
        
        # load actions
        for item in self.model.GetItems(objType = ModelAction):
            self._addEvent(item)
            self.canvas.diagram.AddShape(item)
            item.Show(True)
            # relations/data
            for rel in item.GetRelations():
                if rel.GetFrom() == item:
                    dataItem = rel.GetTo()
                else:
                    dataItem = rel.GetFrom()
                self._addEvent(dataItem)
                self.canvas.diagram.AddShape(dataItem)
                self.AddLine(rel)
                dataItem.Show(True)
        
        # load loops
        for item in self.model.GetItems(objType = ModelLoop):
            self._addEvent(item)
            self.canvas.diagram.AddShape(item)
            item.Show(True)
            
            # connect items in the loop
            self.DefineLoop(item)

        # load conditions
        for item in self.model.GetItems(objType = ModelCondition):
            self._addEvent(item)
            self.canvas.diagram.AddShape(item)
            item.Show(True)
            
            # connect items in the condition
            self.DefineCondition(item)
        
        # load variables
        self.variablePanel.Update()
        self.itemPanel.Update()
        self.SetStatusText('', 0)
        
        # final updates
        for action in self.model.GetItems(objType = ModelAction):
            action.SetValid(action.GetParams())
            action.Update()
        
        self.canvas.Refresh(True)
        
    def WriteModelFile(self, filename):
        """!Save model to model file, recover original file on error.
        
        @return True on success
        @return False on failure
        """
        self.ModelChanged(False)
        tmpfile = tempfile.TemporaryFile(mode='w+b')
        try:
            WriteModelFile(fd = tmpfile, model = self.model)
        except StandardError:
            GError(parent = self,
                   message = _("Writing current settings to model file failed."))
            return False
        
        try:
            mfile = open(filename, "w")
            tmpfile.seek(0)
            for line in tmpfile.readlines():
                mfile.write(line)
        except IOError:
            wx.MessageBox(parent = self,
                          message = _("Unable to open file <%s> for writing.") % filename,
                          caption = _("Error"),
                          style = wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return False
        
        mfile.close()
        
        return True
    
    def DefineLoop(self, loop):
        """!Define loop with given list of items"""
        parent = loop
        items = loop.GetItems()
        if not items:
            return
        
        # remove defined relations first
        for rel in loop.GetRelations():
            self.canvas.GetDiagram().RemoveShape(rel)
        loop.Clear()
        
        for item in items:
            rel = ModelRelation(parent = self, fromShape = parent, toShape = item)
            dx = item.GetX() - parent.GetX()
            dy = item.GetY() - parent.GetY()
            loop.AddRelation(rel)
            if dx != 0:
                rel.SetControlPoints(((parent.GetX(), parent.GetY() + dy / 2),
                                      (parent.GetX() + dx, parent.GetY() + dy / 2)))
            self.AddLine(rel)
            parent = item
        
        # close loop
        item = loop.GetItems()[-1]
        rel = ModelRelation(parent = self, fromShape = item, toShape = loop)
        loop.AddRelation(rel)
        self.AddLine(rel)
        dx = (item.GetX() - loop.GetX()) + loop.GetWidth() / 2 + 50
        dy = item.GetHeight() / 2 + 50
        rel.MakeLineControlPoints(0)
        rel.InsertLineControlPoint(point = wx.RealPoint(loop.GetX() - loop.GetWidth() / 2 ,
                                                        loop.GetY()))
        rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX(),
                                                        item.GetY() + item.GetHeight() / 2))
        rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX(),
                                                        item.GetY() + dy))
        rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX() - dx,
                                                        item.GetY() + dy))
        rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX() - dx,
                                                        loop.GetY()))
        
        self.canvas.Refresh()

    def DefineCondition(self, condition):
        """!Define if-else statement with given list of items"""
        parent = condition
        items = condition.GetItems()
        if not items['if'] and not items['else']:
            return
        
        # remove defined relations first
        for rel in condition.GetRelations():
            self.canvas.GetDiagram().RemoveShape(rel)
        condition.Clear()
        dxIf   = condition.GetX() + condition.GetWidth() / 2
        dxElse = condition.GetX() - condition.GetWidth() / 2
        dy     = condition.GetY()
        for branch in items.keys():
            for item in items[branch]:
                rel = ModelRelation(parent = self, fromShape = parent,
                                    toShape = item)
                condition.AddRelation(rel)
                self.AddLine(rel)
                rel.MakeLineControlPoints(0)
                if branch == 'if':
                    rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX() - item.GetWidth() / 2, item.GetY()))
                    rel.InsertLineControlPoint(point = wx.RealPoint(dxIf, dy))
                else:
                    rel.InsertLineControlPoint(point = wx.RealPoint(dxElse, dy))
                    rel.InsertLineControlPoint(point = wx.RealPoint(item.GetX() - item.GetWidth() / 2, item.GetY()))
                parent = item
        
        self.canvas.Refresh()
        
class ModelCanvas(ogl.ShapeCanvas):
    """!Canvas where model is drawn"""
    def __init__(self, parent):
        self.parent = parent
        ogl.OGLInitialize()
        ogl.ShapeCanvas.__init__(self, parent)
        
        self.diagram = ogl.Diagram()
        self.SetDiagram(self.diagram)
        self.diagram.SetCanvas(self)
        
        self.SetScrollbars(20, 20, 1000/20, 1000/20)
        
        self.Bind(wx.EVT_CHAR,  self.OnChar)
        
    def OnChar(self, event):
        """!Key pressed"""
        kc = event.GetKeyCode()
        diagram = self.GetDiagram()
        if kc == wx.WXK_DELETE:
            self.RemoveSelected()
        
    def RemoveSelected(self):
        """!Remove selected shapes"""
        self.parent.ModelChanged()
        
        diagram = self.GetDiagram()
        for shape in diagram.GetShapeList():
            if not shape.Selected():
                continue
            remList, upList = self.parent.GetModel().RemoveItem(shape)
            shape.Select(False)
            diagram.RemoveShape(shape)
            shape.__del__()
            for item in remList:
                diagram.RemoveShape(item)
                item.__del__()
            
            for item in upList:
                item.Update()
        
        self.Refresh()
  
    def GetNewShapePos(self):
        """!Determine optimal position for newly added object

        @return x,y
        """
        xNew, yNew = map(lambda x: x / 2, self.GetSize())
        diagram = self.GetDiagram()
        
        for shape in diagram.GetShapeList():
            y = shape.GetY()
            yBox = shape.GetBoundingBoxMin()[1] / 2
            if yBox > 0 and y < yNew + yBox and y > yNew - yBox:
                yNew += yBox * 3
        
        return xNew, yNew
    
class ModelEvtHandler(ogl.ShapeEvtHandler):
    """!Model event handler class"""
    def __init__(self, log, frame):
        ogl.ShapeEvtHandler.__init__(self)
        self.log = log
        self.frame = frame
        self.x = self.y = None
        
    def OnLeftClick(self, x, y, keys = 0, attachment = 0):
        """!Left mouse button pressed -> select item & update statusbar"""
        shape = self.GetShape()
        canvas = shape.GetCanvas()
        dc = wx.ClientDC(canvas)
        canvas.PrepareDC(dc)
        
        if hasattr(self.frame, 'defineRelation'):
            drel = self.frame.defineRelation
            if drel['from'] is None:
                drel['from'] = shape
            elif drel['to'] is None:
                drel['to'] = shape
                rel = ModelRelation(parent = self.frame, fromShape = drel['from'],
                                    toShape = drel['to'])
                dlg = ModelRelationDialog(parent = self.frame,
                                          shape = rel)
                if dlg.IsValid():
                    ret = dlg.ShowModal()
                    if ret == wx.ID_OK:
                        option = dlg.GetOption()
                        rel.SetName(option)
                        drel['from'].AddRelation(rel)
                        drel['to'].AddRelation(rel)
                        drel['from'].Update()
                        params = { 'params' : [{ 'name' : option,
                                                 'value' : drel['from'].GetValue()}] }
                        drel['to'].MergeParams(params)
                        self.frame.AddLine(rel)
                
                    dlg.Destroy()
                del self.frame.defineRelation
        
        # select object
        self._onSelectShape(shape)
        
        if hasattr(shape, "GetLog"):
            self.log.SetStatusText(shape.GetLog(), 0)
        else:
            self.log.SetStatusText('', 0)
        
    def OnLeftDoubleClick(self, x, y, keys = 0, attachment = 0):
        """!Left mouse button pressed (double-click) -> show properties"""
        self.OnProperties()
        
    def OnProperties(self, event = None):
        """!Show properties dialog"""
        self.frame.ModelChanged()
        shape = self.GetShape()
        if isinstance(shape, ModelAction):
            module = GUI(parent = self.frame, show = True).ParseCommand(shape.GetLog(string = False),
                                                                        completed = (self.frame.GetOptData, shape, shape.GetParams()))
        
        elif isinstance(shape, ModelData):
            dlg = ModelDataDialog(parent = self.frame, shape = shape)
            shape.SetPropDialog(dlg)
            dlg.CentreOnParent()
            dlg.Show()
        
        elif isinstance(shape, ModelLoop):
            dlg = ModelLoopDialog(parent = self.frame, shape = shape)
            dlg.CentreOnParent()
            if dlg.ShowModal() == wx.ID_OK:
                shape.SetText(dlg.GetCondition())
                alist = list()
                ids = dlg.GetItems()
                for aId in ids['unchecked']:
                    action = self.frame.GetModel().GetItem(aId)
                    action.UnSetBlock(shape)
                for aId in ids['checked']:
                    action = self.frame.GetModel().GetItem(aId)
                    action.SetBlock(shape)
                    if action:
                        alist.append(action)
                shape.SetItems(alist)
                self.frame.DefineLoop(shape)
                self.frame.SetStatusText(shape.GetLog(), 0)
            self.frame.GetCanvas().Refresh()
            
            dlg.Destroy()
        
        elif isinstance(shape, ModelCondition):
            dlg = ModelConditionDialog(parent = self.frame, shape = shape)
            dlg.CentreOnParent()
            if dlg.ShowModal() == wx.ID_OK:
                shape.SetText(dlg.GetCondition())
                ids = dlg.GetItems()
                for b in ids.keys():
                    alist = list()
                    for aId in ids[b]['unchecked']:
                        action = self.frame.GetModel().GetItem(aId)
                        action.UnSetBlock(shape)
                    for aId in ids[b]['checked']:
                        action = self.frame.GetModel().GetItem(aId)
                        action.SetBlock(shape)
                        if action:
                            alist.append(action)
                    shape.SetItems(alist, branch = b)
                self.frame.DefineCondition(shape)
            self.frame.GetCanvas().Refresh()
            
            dlg.Destroy()
                   
    def OnBeginDragLeft(self, x, y, keys = 0, attachment = 0):
        """!Drag shape (begining)"""
        self.frame.ModelChanged()
        if self._previousHandler:
            self._previousHandler.OnBeginDragLeft(x, y, keys, attachment)
        
    def OnEndDragLeft(self, x, y, keys = 0, attachment = 0):
        """!Drag shape (end)"""
        if self._previousHandler:
            self._previousHandler.OnEndDragLeft(x, y, keys, attachment)
        
        shape = self.GetShape()
        if isinstance(shape, ModelLoop):
            self.frame.DefineLoop(shape)
        elif isinstance(shape, ModelCondition):
            self.frame.DefineCondition(shape)
        
        for mo in shape.GetBlock():
            if isinstance(mo, ModelLoop):
                self.frame.DefineLoop(mo)
            elif isinstance(mo, ModelCondition):
                self.frame.DefineCondition(mo)
        
    def OnEndSize(self, x, y):
        """!Resize shape"""
        self.frame.ModelChanged()
        if self._previousHandler:
            self._previousHandler.OnEndSize(x, y)
        
    def OnRightClick(self, x, y, keys = 0, attachment = 0):
        """!Right click -> pop-up menu"""
        if not hasattr (self, "popupID"):
            self.popupID = dict()
            for key in ('remove', 'enable', 'addPoint',
                        'delPoint', 'intermediate', 'props', 'id'):
                self.popupID[key] = wx.NewId()
        
        # record coordinates
        self.x = x
        self.y = y
        
        # select object
        shape = self.GetShape()
        self._onSelectShape(shape)
        
        popupMenu = wx.Menu()
        popupMenu.Append(self.popupID['remove'], text=_('Remove'))
        self.frame.Bind(wx.EVT_MENU, self.OnRemove, id = self.popupID['remove'])
        if isinstance(shape, ModelAction) or isinstance(shape, ModelLoop):
            if shape.IsEnabled():
                popupMenu.Append(self.popupID['enable'], text=_('Disable'))
                self.frame.Bind(wx.EVT_MENU, self.OnDisable, id = self.popupID['enable'])
            else:
                popupMenu.Append(self.popupID['enable'], text=_('Enable'))
                self.frame.Bind(wx.EVT_MENU, self.OnEnable, id = self.popupID['enable'])
        
        if isinstance(shape, ModelRelation):
            popupMenu.AppendSeparator()
            popupMenu.Append(self.popupID['addPoint'], text=_('Add control point'))
            self.frame.Bind(wx.EVT_MENU, self.OnAddPoint, id = self.popupID['addPoint'])
            popupMenu.Append(self.popupID['delPoint'], text=_('Remove control point'))
            self.frame.Bind(wx.EVT_MENU, self.OnRemovePoint, id = self.popupID['delPoint'])
            if len(shape.GetLineControlPoints()) == 2:
                popupMenu.Enable(self.popupID['delPoint'], False)
        
        if isinstance(shape, ModelData) and '@' not in shape.GetValue():
            popupMenu.AppendSeparator()
            popupMenu.Append(self.popupID['intermediate'], text=_('Intermediate'),
                             kind = wx.ITEM_CHECK)
            if self.GetShape().IsIntermediate():
                popupMenu.Check(self.popupID['intermediate'], True)
            
            self.frame.Bind(wx.EVT_MENU, self.OnIntermediate, id = self.popupID['intermediate'])
            
        if isinstance(shape, ModelData) or \
                isinstance(shape, ModelAction) or \
                isinstance(shape, ModelLoop):
            popupMenu.AppendSeparator()
            popupMenu.Append(self.popupID['props'], text=_('Properties'))
            self.frame.Bind(wx.EVT_MENU, self.OnProperties, id = self.popupID['props'])
        
        self.frame.PopupMenu(popupMenu)
        popupMenu.Destroy()

    def OnDisable(self, event):
        """!Disable action"""
        self._onEnable(False)
        
    def OnEnable(self, event):
        """!Disable action"""
        self._onEnable(True)
        
    def _onEnable(self, enable):
        shape = self.GetShape()
        shape.Enable(enable)
        self.frame.ModelChanged()
        self.frame.canvas.Refresh()
        
    def _onSelectShape(self, shape):
        canvas = shape.GetCanvas()
        dc = wx.ClientDC(canvas)
        
        if shape.Selected():
            shape.Select(False, dc)
        else:
            redraw = False
            shapeList = canvas.GetDiagram().GetShapeList()
            toUnselect = list()
            
            for s in shapeList:
                if s.Selected():
                    toUnselect.append(s)
            
            shape.Select(True, dc)
            
            for s in toUnselect:
                s.Select(False, dc)
        
        canvas.Refresh(False)
        
    def OnAddPoint(self, event):
        """!Add control point"""
        shape = self.GetShape()
        shape.InsertLineControlPoint(point = wx.RealPoint(self.x, self.y))
        shape.ResetShapes()
        shape.Select(True)
        self.frame.ModelChanged()
        self.frame.canvas.Refresh()
        
    def OnRemovePoint(self, event):
        """!Remove control point"""
        shape = self.GetShape()
        shape.DeleteLineControlPoint()
        shape.Select(False)
        shape.Select(True)
        self.frame.ModelChanged()
        self.frame.canvas.Refresh()
        
    def OnIntermediate(self, event):
        """!Mark data as intermediate"""
        self.frame.ModelChanged()
        shape = self.GetShape()
        shape.SetIntermediate(event.IsChecked())
        self.frame.canvas.Refresh()

    def OnRemove(self, event):
        """!Remove shape
        """
        self.frame.GetCanvas().RemoveSelected()
        self.frame.itemPanel.Update()
       
class VariablePanel(wx.Panel):
    def __init__(self, parent, id = wx.ID_ANY,
                 **kwargs):
        """!Manage model variables panel
        """
        self.parent = parent
        
        wx.Panel.__init__(self, parent = parent, id = id, **kwargs)
        
        self.listBox = wx.StaticBox(parent = self, id = wx.ID_ANY,
                                    label=" %s " % _("List of variables - right-click to delete"))
        
        self.list = VariableListCtrl(parent = self,
                                     columns = [_("Name"), _("Data type"),
                                                _("Default value"), _("Description")])
        
        # add new category
        self.addBox = wx.StaticBox(parent = self, id = wx.ID_ANY,
                                   label = " %s " % _("Add new variable"))
        self.name = wx.TextCtrl(parent = self, id = wx.ID_ANY)
        wx.CallAfter(self.name.SetFocus)
        self.type = wx.Choice(parent = self, id = wx.ID_ANY,
                              choices = [_("integer"),
                                         _("float"),
                                         _("string"),
                                         _("raster"),
                                         _("vector"),
                                         _("mapset"),
                                         _("file")])
        self.type.SetSelection(2) # string
        self.value = wx.TextCtrl(parent = self, id = wx.ID_ANY)
        self.desc = wx.TextCtrl(parent = self, id = wx.ID_ANY)
        
        # buttons
        self.btnAdd = wx.Button(parent = self, id = wx.ID_ADD)
        self.btnAdd.SetToolTipString(_("Add new variable to the model"))
        self.btnAdd.Enable(False)
        
        # bindings
        self.name.Bind(wx.EVT_TEXT, self.OnText)
        self.value.Bind(wx.EVT_TEXT, self.OnText)
        self.desc.Bind(wx.EVT_TEXT, self.OnText)
        self.btnAdd.Bind(wx.EVT_BUTTON, self.OnAdd)
        
        self._layout()

    def _layout(self):
        """!Layout dialog"""
        listSizer = wx.StaticBoxSizer(self.listBox, wx.VERTICAL)
        listSizer.Add(item = self.list, proportion = 1,
                      flag = wx.EXPAND)
        
        addSizer = wx.StaticBoxSizer(self.addBox, wx.VERTICAL)
        gridSizer = wx.GridBagSizer(hgap = 5, vgap = 5)
        gridSizer.AddGrowableCol(1)
        gridSizer.Add(item = wx.StaticText(parent = self, id = wx.ID_ANY,
                                           label = "%s:" % _("Name")),
                      flag = wx.ALIGN_CENTER_VERTICAL,
                      pos = (0, 0))
        gridSizer.Add(item = self.name,
                      pos = (0, 1),
                      flag = wx.EXPAND)
        gridSizer.Add(item = wx.StaticText(parent = self, id = wx.ID_ANY,
                                           label = "%s:" % _("Data type")),
                      flag = wx.ALIGN_CENTER_VERTICAL,
                      pos = (0, 2))
        gridSizer.Add(item = self.type,
                      pos = (0, 3))
        gridSizer.Add(item = wx.StaticText(parent = self, id = wx.ID_ANY,
                                           label = "%s:" % _("Default value")),
                      flag = wx.ALIGN_CENTER_VERTICAL,
                      pos = (1, 0))
        gridSizer.Add(item = self.value,
                      pos = (1, 1), span = (1, 3),
                      flag = wx.EXPAND)
        gridSizer.Add(item = wx.StaticText(parent = self, id = wx.ID_ANY,
                                           label = "%s:" % _("Description")),
                      flag = wx.ALIGN_CENTER_VERTICAL,
                      pos = (2, 0))
        gridSizer.Add(item = self.desc,
                      pos = (2, 1), span = (1, 3),
                      flag = wx.EXPAND)
        addSizer.Add(item = gridSizer,
                     flag = wx.EXPAND)
        addSizer.Add(item = self.btnAdd, proportion = 0,
                     flag = wx.TOP | wx.ALIGN_RIGHT, border = 5)
        
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        mainSizer.Add(item = listSizer, proportion = 1,
                      flag = wx.EXPAND | wx.ALL | wx.ALIGN_CENTER, border = 5)
        mainSizer.Add(item = addSizer, proportion = 0,
                      flag = wx.EXPAND | wx.ALIGN_CENTER |
                      wx.LEFT | wx.RIGHT | wx.BOTTOM, border = 5)
        
        self.SetSizer(mainSizer)
        mainSizer.Fit(self)
        
    def OnText(self, event):
        """!Text entered"""
        if self.name.GetValue():
            self.btnAdd.Enable()
        else:
            self.btnAdd.Enable(False)
    
    def OnAdd(self, event):
        """!Add new variable to the list"""
        msg = self.list.Append(self.name.GetValue(),
                               self.type.GetStringSelection(),
                               self.value.GetValue(),
                               self.desc.GetValue())
        self.name.SetValue('')
        self.name.SetFocus()
        
        if msg:
            GError(parent = self,
                   message = msg)
        else:
            self.type.SetSelection(2) # string
            self.value.SetValue('')
            self.desc.SetValue('')
            self.UpdateModelVariables()
        
    def UpdateModelVariables(self):
        """!Update model variables"""
        variables = dict()
        for values in self.list.GetData().itervalues():
            name = values[0]
            variables[name] = { 'type' : str(values[1]) }
            if values[2]:
                variables[name]['value'] = values[2]
            if values[3]:
                variables[name]['description'] = values[3]
        
        self.parent.GetModel().SetVariables(variables)
        self.parent.ModelChanged()

    def Update(self):
        """!Reload list of variables"""
        self.list.OnReload(None)
        
    def Reset(self):
        """!Remove all variables"""
        self.list.DeleteAllItems()
        self.parent.GetModel().SetVariables([])
        
class ItemPanel(wx.Panel):
    def __init__(self, parent, id = wx.ID_ANY,
                 **kwargs):
        """!Manage model items
        """
        self.parent = parent
        
        wx.Panel.__init__(self, parent = parent, id = id, **kwargs)
        
        self.listBox = wx.StaticBox(parent = self, id = wx.ID_ANY,
                                    label=" %s " % _("List of items - right-click to delete"))
        
        self.list = ItemListCtrl(parent = self,
                                 columns = [_("ID"), _("Name"), _("In block"),
                                            _("Command / Condition")])
        
        self._layout()

    def _layout(self):
        """!Layout dialog"""
        listSizer = wx.StaticBoxSizer(self.listBox, wx.VERTICAL)
        listSizer.Add(item = self.list, proportion = 1,
                      flag = wx.EXPAND)
        
        mainSizer = wx.BoxSizer(wx.VERTICAL)
        mainSizer.Add(item = listSizer, proportion = 1,
                      flag = wx.EXPAND | wx.ALL | wx.ALIGN_CENTER, border = 5)
        
        self.SetSizer(mainSizer)
        mainSizer.Fit(self)
        
    def Update(self):
        """!Reload list of variables"""
        self.list.OnReload(None)

class PythonPanel(wx.Panel):
    def __init__(self, parent, id = wx.ID_ANY,
                 **kwargs):
        """!Model as python script
        """
        self.parent = parent
        
        wx.Panel.__init__(self, parent = parent, id = id, **kwargs)

        self.filename = None # temp file to run
        
        self.bodyBox = wx.StaticBox(parent = self, id = wx.ID_ANY,
                                    label = " %s " % _("Python script"))
        self.body = PyStc(parent = self, statusbar = self.parent.GetStatusBar())

        self.btnRun = wx.Button(parent = self, id = wx.ID_ANY, label = _("&Run"))
        self.btnRun.SetToolTipString(_("Run python script"))
        self.Bind(wx.EVT_BUTTON, self.OnRun, self.btnRun)
        self.btnSaveAs = wx.Button(parent = self, id = wx.ID_SAVEAS)
        self.btnSaveAs.SetToolTipString(_("Save python script to file"))
        self.Bind(wx.EVT_BUTTON, self.OnSaveAs, self.btnSaveAs)
        self.btnRefresh = wx.Button(parent = self, id = wx.ID_REFRESH)
        self.btnRefresh.SetToolTipString(_("Refresh python script based on the model.\n"
                                           "It will discards all local changes."))
        self.Bind(wx.EVT_BUTTON, self.OnRefresh, self.btnRefresh)
        
        self._layout()
        
    def _layout(self):
        sizer = wx.BoxSizer(wx.VERTICAL)
        bodySizer = wx.StaticBoxSizer(self.bodyBox, wx.HORIZONTAL)
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        
        bodySizer.Add(item = self.body, proportion = 1,
                      flag = wx.EXPAND | wx.ALL, border = 3)
        
        btnSizer.Add(item = self.btnRefresh, proportion = 0,
                     flag = wx.LEFT | wx.RIGHT, border = 5)
        btnSizer.AddStretchSpacer()
        btnSizer.Add(item = self.btnSaveAs, proportion = 0,
                     flag = wx.RIGHT | wx.ALIGN_RIGHT, border = 5)
        btnSizer.Add(item = self.btnRun, proportion = 0,
                     flag = wx.RIGHT | wx.ALIGN_RIGHT, border = 5)
        
        sizer.Add(item = bodySizer, proportion = 1,
                  flag = wx.EXPAND | wx.ALL, border = 3)
        sizer.Add(item = btnSizer, proportion = 0,
                  flag = wx.EXPAND | wx.ALL, border = 3)
        
        sizer.Fit(self)
        sizer.SetSizeHints(self)
        self.SetSizer(sizer)

    def OnRun(self, event):
        """!Run Python script"""
        self.filename = grass.tempfile()
        try:
            fd = open(self.filename, "w")
            fd.write(self.body.GetText())
        except IOError, e:
            GError(_("Unable to launch Python script. %s") % e,
                   parent = self)
            return
        finally:
            fd.close()
            mode = stat.S_IMODE(os.lstat(self.filename)[stat.ST_MODE])
            os.chmod(self.filename, mode | stat.S_IXUSR)
        
        self.parent.goutput.RunCmd([fd.name], switchPage = True,
                                   skipInterface = True, onDone = self.OnDone)
        
        event.Skip()

    def OnDone(self, cmd, returncode):
        """!Python script finished"""
        grass.try_remove(self.filename)
        self.filename = None
        
    def SaveAs(self, force = False):
        """!Save python script to file

        @return filename
        """
        filename = ''
        dlg = wx.FileDialog(parent = self,
                            message = _("Choose file to save"),
                            defaultDir = os.getcwd(),
                            wildcard = _("Python script (*.py)|*.py"),
                            style = wx.FD_SAVE)
        
        if dlg.ShowModal() == wx.ID_OK:
            filename = dlg.GetPath()
        
        if not filename:
            return ''
        
        # check for extension
        if filename[-3:] != ".py":
            filename += ".py"
        
        if os.path.exists(filename):
            dlg = wx.MessageDialog(self, message=_("File <%s> already exists. "
                                                   "Do you want to overwrite this file?") % filename,
                                   caption=_("Save file"),
                                   style=wx.YES_NO | wx.YES_DEFAULT | wx.ICON_QUESTION)
            if dlg.ShowModal() == wx.ID_NO:
                dlg.Destroy()
                return ''
            
            dlg.Destroy()
        
        fd = open(filename, "w")
        try:
            if force:
                WritePythonFile(fd, self.parent.GetModel())
            else:
                fd.write(self.body.GetText())
        finally:
            fd.close()
        
        # executable file
        os.chmod(filename, stat.S_IRWXU | stat.S_IWUSR)
        
        return filename
    
    def OnSaveAs(self, event):
        """!Save python script to file"""
        self.SaveAs(force = False)
        event.Skip()
        
    def RefreshScript(self):
        """!Refresh Python script

        @return True on refresh
        @return False script hasn't been updated
        """
        if self.body.modified:
            dlg = wx.MessageDialog(self,
                                   message = _("Python script is locally modificated. "
                                               "Refresh will discard all changes. "
                                               "Do you really want to continue?"),
                                   caption=_("Update"),
                                   style = wx.YES_NO | wx.NO_DEFAULT |
                                   wx.ICON_QUESTION | wx.CENTRE)
            ret = dlg.ShowModal()
            dlg.Destroy()
            if ret == wx.ID_NO:
                return False
        
        fd = tempfile.TemporaryFile()
        WritePythonFile(fd, self.parent.GetModel())
        fd.seek(0)
        self.body.SetText(fd.read())
        fd.close()
        
        self.body.modified = False
        
        return True
    
    def OnRefresh(self, event):
        """!Refresh Python script"""
        if self.RefreshScript():
            self.parent.SetStatusText(_('Python script is up-to-date'), 0)
        event.Skip()
        
    def IsModified(self):
        """!Check if python script has been modified"""
        return self.body.modified
    
    def IsEmpty(self):
        """!Check if python script is empty"""
        return len(self.body.GetText()) == 0
        
def main():
    import gettext
    gettext.install('grasswxpy', os.path.join(os.getenv("GISBASE"), 'locale'), unicode = True)
    
    app = wx.PySimpleApp()
    wx.InitAllImageHandlers()
    frame = ModelFrame(parent = None)
    if len(sys.argv) > 1:
        frame.LoadModelFile(sys.argv[1])
    frame.Show()
    
    app.MainLoop()
    
if __name__ == "__main__":
    main()