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

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 GConsole, \
    EVT_CMD_RUN, EVT_CMD_DONE, EVT_CMD_PREPARE, EVT_OUTPUT_TEXT
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 ModelerMenuData
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 gmodeler.pystc       import PyStc

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 = ModelerMenuData())
        
        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 = GConsole(parent = self, frame = self)
        self.goutput.Bind(EVT_OUTPUT_TEXT, self.OnOutputText)
        self.Bind(EVT_CMD_RUN, self.OnCmdRun)
        self.Bind(EVT_CMD_DONE, self.OnCmdDone)
        self.Bind(EVT_CMD_PREPARE, self.OnCmdPrepare)

        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 OnOutputText(self, event):
        """!Manages @c 'output' notebook page according to event priority."""
        if event.priority == 1:
            self.notebook.HighlightPageByName('output')
        if event.priority >= 2:
            self.notebook.SetSelectionByName('output')
        if event.priority >= 3:
            self.SetFocus()
            self.Raise()

    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