Geografic-Information-System/gui/wxpython/gis_set.py

"""
@package gis_set

GRASS start-up screen.

Initialization module for wxPython GRASS GUI.
Location/mapset management (selection, creation, etc.).

Classes:
 - gis_set::GRASSStartup
 - gis_set::GListBox
 - gis_set::StartUp

(C) 2006-2014 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 Michael Barton and Jachym Cepicky (original author)
@author Martin Landa <landa.martin gmail.com> (various updates)
"""

import os
import sys
import copy
import platform

# i18n is taken care of in the grass library code.
# So we need to import it before any of the GUI code.

from core import globalvar
import wx
import wx.lib.mixins.listctrl as listmix

from core.gcmd import GMessage, GError, RunCommand
from core.utils import GetListOfLocations, GetListOfMapsets
from startup.utils import (
    get_lockfile_if_present, get_possible_database_path,
    create_database_directory)
from startup.guiutils import (SetSessionMapset,
                              create_mapset_interactively,
                              rename_mapset_interactively,
                              rename_location_interactively,
                              delete_mapset_interactively,
                              delete_location_interactively)
import startup.guiutils as sgui
from location_wizard.dialogs import RegionDef
from gui_core.widgets import StaticWrapText
from gui_core.wrap import Button, ListCtrl, StaticText, StaticBox, \
    TextCtrl, BitmapFromImage


class GRASSStartup(wx.Frame):
    exit_success = 0
    # 2 is file not found from python interpreter
    exit_user_requested = 5

    """GRASS start-up screen"""

    def __init__(self, parent=None, id=wx.ID_ANY,
                 style=wx.DEFAULT_FRAME_STYLE):

        #
        # GRASS variables
        #
        self.gisbase = os.getenv("GISBASE")
        self.grassrc = sgui.read_gisrc()
        self.gisdbase = self.GetRCValue("GISDBASE")

        #
        # list of locations/mapsets
        #
        self.listOfLocations = []
        self.listOfMapsets = []
        self.listOfMapsetsSelectable = []

        wx.Frame.__init__(self, parent=parent, id=id, style=style)

        self.locale = wx.Locale(language=wx.LANGUAGE_DEFAULT)

        # scroll panel was used here but not properly and is probably not need
        # as long as it is not high too much
        self.panel = wx.Panel(parent=self, id=wx.ID_ANY)

        # i18N

        #
        # graphical elements
        #
        # image
        try:
            if os.getenv('ISISROOT'):
                name = os.path.join(
                    globalvar.GUIDIR,
                    "images",
                    "startup_banner_isis.png")
            else:
                name = os.path.join(
                    globalvar.GUIDIR, "images", "startup_banner.png")
            self.hbitmap = wx.StaticBitmap(self.panel, wx.ID_ANY,
                                           wx.Bitmap(name=name,
                                                     type=wx.BITMAP_TYPE_PNG))
        except:
            self.hbitmap = wx.StaticBitmap(
                self.panel, wx.ID_ANY, BitmapFromImage(
                    wx.EmptyImage(530, 150)))

        # labels
        # crashes when LOCATION doesn't exist
        # get version & revision
        grassVersion, grassRevisionStr = sgui.GetVersion()

        self.gisdbase_box = StaticBox(
            parent=self.panel, id=wx.ID_ANY, label=" %s " %
            _("1. Select GRASS GIS database directory"))
        self.location_box = StaticBox(
            parent=self.panel, id=wx.ID_ANY, label=" %s " %
            _("2. Select GRASS Location"))
        self.mapset_box = StaticBox(
            parent=self.panel, id=wx.ID_ANY, label=" %s " %
            _("3. Select GRASS Mapset"))

        self.lmessage = StaticWrapText(parent=self.panel)
        # It is not clear if all wx versions supports color, so try-except.
        # The color itself may not be correct for all platforms/system settings
        # but in http://xoomer.virgilio.it/infinity77/wxPython/Widgets/wx.SystemSettings.html
        # there is no 'warning' color.
        try:
            self.lmessage.SetForegroundColour(wx.Colour(255, 0, 0))
        except AttributeError:
            pass

        self.gisdbase_panel = wx.Panel(parent=self.panel)
        self.location_panel = wx.Panel(parent=self.panel)
        self.mapset_panel = wx.Panel(parent=self.panel)

        self.ldbase = StaticText(
            parent=self.gisdbase_panel, id=wx.ID_ANY,
            label=_("GRASS GIS database directory contains Locations."))

        self.llocation = StaticWrapText(
            parent=self.location_panel, id=wx.ID_ANY,
            label=_("All data in one Location is in the same "
                    " coordinate reference system (projection)."
                    " One Location can be one project."
                    " Location contains Mapsets."),
            style=wx.ALIGN_LEFT)

        self.lmapset = StaticWrapText(
            parent=self.mapset_panel, id=wx.ID_ANY,
            label=_("Mapset contains GIS data related"
                    " to one project, task within one project,"
                    " subregion or user."),
            style=wx.ALIGN_LEFT)

        try:
            for label in [self.ldbase, self.llocation, self.lmapset]:
                label.SetForegroundColour(
                    wx.SystemSettings.GetColour(wx.SYS_COLOUR_GRAYTEXT))
        except AttributeError:
            # for explanation of try-except see above
            pass

        # buttons
        self.bstart = Button(parent=self.panel, id=wx.ID_ANY,
                             label=_("Start &GRASS session"))
        self.bstart.SetDefault()
        self.bexit = Button(parent=self.panel, id=wx.ID_EXIT)
        self.bstart.SetMinSize((180, self.bexit.GetSize()[1]))
        self.bhelp = Button(parent=self.panel, id=wx.ID_HELP)
        self.bbrowse = Button(parent=self.gisdbase_panel, id=wx.ID_ANY,
                              label=_("&Browse"))
        self.bmapset = Button(parent=self.mapset_panel, id=wx.ID_ANY,
                              # GTC New mapset
                              label=_("&New"))
        self.bmapset.SetToolTip(_("Create a new Mapset in selected Location"))
        self.bwizard = Button(parent=self.location_panel, id=wx.ID_ANY,
                              # GTC New location
                              label=_("N&ew"))
        self.bwizard.SetToolTip(
            _(
                "Create a new location using location wizard."
                " After location is created successfully,"
                " GRASS session is started."))
        self.rename_location_button = Button(parent=self.location_panel, id=wx.ID_ANY,
                                             # GTC Rename location
                                             label=_("Ren&ame"))
        self.rename_location_button.SetToolTip(_("Rename selected location"))
        self.delete_location_button = Button(parent=self.location_panel, id=wx.ID_ANY,
                                             # GTC Delete location
                                             label=_("De&lete"))
        self.delete_location_button.SetToolTip(_("Delete selected location"))
        self.download_location_button = Button(parent=self.location_panel, id=wx.ID_ANY,
                                             label=_("Do&wnload"))
        self.download_location_button.SetToolTip(_("Download sample location"))

        self.rename_mapset_button = Button(parent=self.mapset_panel, id=wx.ID_ANY,
                                           # GTC Rename mapset
                                           label=_("&Rename"))
        self.rename_mapset_button.SetToolTip(_("Rename selected mapset"))
        self.delete_mapset_button = Button(parent=self.mapset_panel, id=wx.ID_ANY,
                                           # GTC Delete mapset
                                           label=_("&Delete"))
        self.delete_mapset_button.SetToolTip(_("Delete selected mapset"))

        # textinputs
        self.tgisdbase = TextCtrl(
            parent=self.gisdbase_panel, id=wx.ID_ANY, value="", size=(
                300, -1), style=wx.TE_PROCESS_ENTER)

        # Locations
        self.lblocations = GListBox(parent=self.location_panel,
                                    id=wx.ID_ANY, size=(180, 200),
                                    choices=self.listOfLocations)
        self.lblocations.SetColumnWidth(0, 180)

        # TODO: sort; but keep PERMANENT on top of list
        # Mapsets
        self.lbmapsets = GListBox(parent=self.mapset_panel,
                                  id=wx.ID_ANY, size=(180, 200),
                                  choices=self.listOfMapsets)
        self.lbmapsets.SetColumnWidth(0, 180)

        # layout & properties, first do layout so everything is created
        self._do_layout()
        self._set_properties(grassVersion, grassRevisionStr)

        # events
        self.bbrowse.Bind(wx.EVT_BUTTON, self.OnBrowse)
        self.bstart.Bind(wx.EVT_BUTTON, self.OnStart)
        self.bexit.Bind(wx.EVT_BUTTON, self.OnExit)
        self.bhelp.Bind(wx.EVT_BUTTON, self.OnHelp)
        self.bmapset.Bind(wx.EVT_BUTTON, self.OnCreateMapset)
        self.bwizard.Bind(wx.EVT_BUTTON, self.OnWizard)

        self.rename_location_button.Bind(wx.EVT_BUTTON, self.OnRenameLocation)
        self.delete_location_button.Bind(wx.EVT_BUTTON, self.OnDeleteLocation)
        self.download_location_button.Bind(wx.EVT_BUTTON, self.OnDownloadLocation)
        self.rename_mapset_button.Bind(wx.EVT_BUTTON, self.OnRenameMapset)
        self.delete_mapset_button.Bind(wx.EVT_BUTTON, self.OnDeleteMapset)

        self.lblocations.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnSelectLocation)
        self.lbmapsets.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnSelectMapset)
        self.lbmapsets.Bind(wx.EVT_LIST_ITEM_ACTIVATED, self.OnStart)
        self.tgisdbase.Bind(wx.EVT_TEXT_ENTER, self.OnSetDatabase)
        self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)

    def _set_properties(self, version, revision):
        """Set frame properties

        :param version: Version in the form of X.Y.Z
        :param revision: Version control revision with leading space

        *revision* should be an empty string in case of release and
        otherwise it needs a leading space to be separated from the rest
        of the title.
        """
        self.SetTitle(_("GRASS GIS %s Startup%s") % (version, revision))
        self.SetIcon(wx.Icon(os.path.join(globalvar.ICONDIR, "grass.ico"),
                             wx.BITMAP_TYPE_ICO))

        self.bstart.SetForegroundColour(wx.Colour(35, 142, 35))
        self.bstart.SetToolTip(_("Enter GRASS session"))
        self.bstart.Enable(False)
        self.bmapset.Enable(False)
        # this all was originally a choice, perhaps just mapset needed
        self.rename_location_button.Enable(False)
        self.delete_location_button.Enable(False)
        self.rename_mapset_button.Enable(False)
        self.delete_mapset_button.Enable(False)

        # set database
        if not self.gisdbase:
            # sets an initial path for gisdbase if nothing in GISRC
            if os.path.isdir(os.getenv("HOME")):
                self.gisdbase = os.getenv("HOME")
            else:
                self.gisdbase = os.getcwd()
        try:
            self.tgisdbase.SetValue(self.gisdbase)
        except UnicodeDecodeError:
            wx.MessageBox(parent=self, caption=_("Error"),
                          message=_("Unable to set GRASS database. "
                                    "Check your locale settings."),
                          style=wx.OK | wx.ICON_ERROR | wx.CENTRE)

        self.OnSetDatabase(None)
        location = self.GetRCValue("LOCATION_NAME")
        if location == "<UNKNOWN>" or location is None:
            return
        if not os.path.isdir(os.path.join(self.gisdbase, location)):
            location = None

        # list of locations
        self.UpdateLocations(self.gisdbase)
        try:
            self.lblocations.SetSelection(self.listOfLocations.index(location),
                                          force=True)
            self.lblocations.EnsureVisible(
                self.listOfLocations.index(location))
        except ValueError:
            sys.stderr.write(
                _("ERROR: Location <%s> not found\n") %
                self.GetRCValue("LOCATION_NAME"))
            if len(self.listOfLocations) > 0:
                self.lblocations.SetSelection(0, force=True)
                self.lblocations.EnsureVisible(0)
                location = self.listOfLocations[0]
            else:
                return

        # list of mapsets
        self.UpdateMapsets(os.path.join(self.gisdbase, location))
        mapset = self.GetRCValue("MAPSET")
        if mapset:
            try:
                self.lbmapsets.SetSelection(self.listOfMapsets.index(mapset),
                                            force=True)
                self.lbmapsets.EnsureVisible(self.listOfMapsets.index(mapset))
            except ValueError:
                sys.stderr.write(_("ERROR: Mapset <%s> not found\n") % mapset)
                self.lbmapsets.SetSelection(0, force=True)
                self.lbmapsets.EnsureVisible(0)

    def _do_layout(self):
        sizer = wx.BoxSizer(wx.VERTICAL)
        self.sizer = sizer  # for the layout call after changing message
        dbase_sizer = wx.BoxSizer(wx.HORIZONTAL)

        location_mapset_sizer = wx.BoxSizer(wx.HORIZONTAL)

        gisdbase_panel_sizer = wx.BoxSizer(wx.VERTICAL)
        gisdbase_boxsizer = wx.StaticBoxSizer(self.gisdbase_box, wx.VERTICAL)

        btns_sizer = wx.BoxSizer(wx.HORIZONTAL)

        self.gisdbase_panel.SetSizer(gisdbase_panel_sizer)

        # gis data directory

        gisdbase_boxsizer.Add(self.gisdbase_panel, proportion=1,
                              flag=wx.EXPAND | wx.ALL,
                              border=1)

        gisdbase_panel_sizer.Add(dbase_sizer, proportion=1,
                                 flag=wx.EXPAND | wx.ALL,
                                 border=1)
        gisdbase_panel_sizer.Add(self.ldbase, proportion=0,
                                 flag=wx.EXPAND | wx.ALL,
                                 border=1)

        dbase_sizer.Add(self.tgisdbase, proportion=1,
                        flag=wx.ALIGN_CENTER_VERTICAL | wx.ALL,
                        border=1)
        dbase_sizer.Add(self.bbrowse, proportion=0,
                        flag=wx.ALIGN_CENTER_VERTICAL | wx.ALL,
                        border=1)

        gisdbase_panel_sizer.Fit(self.gisdbase_panel)

        # location and mapset lists

        def layout_list_box(box, panel, list_box, buttons, description):
            panel_sizer = wx.BoxSizer(wx.VERTICAL)
            main_sizer = wx.BoxSizer(wx.HORIZONTAL)
            box_sizer = wx.StaticBoxSizer(box, wx.VERTICAL)
            buttons_sizer = wx.BoxSizer(wx.VERTICAL)

            panel.SetSizer(panel_sizer)
            panel_sizer.Fit(panel)

            main_sizer.Add(list_box, proportion=1,
                           flag=wx.EXPAND | wx.ALL,
                           border=1)
            main_sizer.Add(buttons_sizer, proportion=0,
                           flag=wx.ALL,
                           border=1)
            for button in buttons:
                buttons_sizer.Add(button, proportion=0,
                                  flag=wx.EXPAND | wx.LEFT | wx.RIGHT | wx.BOTTOM,
                                  border=3)
            box_sizer.Add(panel, proportion=1,
                          flag=wx.EXPAND | wx.ALL,
                          border=1)
            panel_sizer.Add(main_sizer, proportion=1,
                            flag=wx.EXPAND | wx.ALL,
                            border=1)
            panel_sizer.Add(description, proportion=0,
                            flag=wx.EXPAND | wx.ALL,
                            border=1)
            return box_sizer

        location_boxsizer = layout_list_box(
            box=self.location_box,
            panel=self.location_panel,
            list_box=self.lblocations,
            buttons=[self.bwizard, self.rename_location_button,
                     self.delete_location_button,
                     self.download_location_button],
            description=self.llocation)
        mapset_boxsizer = layout_list_box(
            box=self.mapset_box,
            panel=self.mapset_panel,
            list_box=self.lbmapsets,
            buttons=[self.bmapset, self.rename_mapset_button,
                     self.delete_mapset_button],
            description=self.lmapset)

        # location and mapset sizer
        location_mapset_sizer.Add(location_boxsizer, proportion=1,
                                  flag=wx.LEFT | wx.RIGHT | wx.EXPAND,
                                  border=3)
        location_mapset_sizer.Add(mapset_boxsizer, proportion=1,
                                  flag=wx.RIGHT | wx.EXPAND,
                                  border=3)

        # buttons
        btns_sizer.Add(self.bstart, proportion=0,
                       flag=wx.ALIGN_CENTER_HORIZONTAL |
                       wx.ALIGN_CENTER_VERTICAL |
                       wx.ALL,
                       border=5)
        btns_sizer.Add(self.bexit, proportion=0,
                       flag=wx.ALIGN_CENTER_HORIZONTAL |
                       wx.ALIGN_CENTER_VERTICAL |
                       wx.ALL,
                       border=5)
        btns_sizer.Add(self.bhelp, proportion=0,
                       flag=wx.ALIGN_CENTER_HORIZONTAL |
                       wx.ALIGN_CENTER_VERTICAL |
                       wx.ALL,
                       border=5)

        # main sizer
        sizer.Add(self.hbitmap,
                  proportion=0,
                  flag=wx.ALIGN_CENTER_VERTICAL |
                  wx.ALIGN_CENTER_HORIZONTAL |
                  wx.ALL,
                  border=3)  # image
        sizer.Add(gisdbase_boxsizer, proportion=0,
                  flag=wx.RIGHT | wx.LEFT | wx.TOP | wx.EXPAND,
                  border=3)  # GISDBASE setting

        # warning/error message
        sizer.Add(self.lmessage,
                  proportion=0,
                  flag=wx.ALIGN_LEFT | wx.ALL | wx.EXPAND, border=5)
        sizer.Add(location_mapset_sizer, proportion=1,
                  flag=wx.RIGHT | wx.LEFT | wx.EXPAND,
                  border=1)
        sizer.Add(btns_sizer, proportion=0,
                  flag=wx.ALIGN_CENTER_VERTICAL |
                  wx.ALIGN_CENTER_HORIZONTAL |
                  wx.RIGHT | wx.LEFT,
                  border=3)

        self.panel.SetAutoLayout(True)
        self.panel.SetSizer(sizer)
        sizer.Fit(self.panel)
        sizer.SetSizeHints(self)
        self.Layout()

    def _showWarning(self, text):
        """Displays a warning, hint or info message to the user.

        This function can be used for all kinds of messages except for
        error messages.

        .. note::
            There is no cleaning procedure. You should call _hideMessage when
            you know that there is everything correct now.
        """
        self.lmessage.SetLabel(text)
        self.sizer.Layout()

    def _showError(self, text):
        """Displays a error message to the user.

        This function should be used only when something serious and unexpected
        happens, otherwise _showWarning should be used.

        .. note::
            There is no cleaning procedure. You should call _hideMessage when
            you know that there is everything correct now.
        """
        self.lmessage.SetLabel(_("Error: {text}").format(text=text))
        self.sizer.Layout()

    def _hideMessage(self):
        """Clears/hides the error message."""
        # we do no hide widget
        # because we do not want the dialog to change the size
        self.lmessage.SetLabel("")
        self.sizer.Layout()

    def GetRCValue(self, value):
        """Return GRASS variable (read from GISRC)
        """
        if value in self.grassrc:
            return self.grassrc[value]
        else:
            return None

    def SuggestDatabase(self):
        """Suggest (set) possible GRASS Database value"""
        # only if nothing is set (<UNKNOWN> comes from init script)
        if self.GetRCValue("LOCATION_NAME") != "<UNKNOWN>":
            return
        path = get_possible_database_path()
        # If nothing found, try to create GRASS directory
        if path is None:
            path = create_database_directory()

        if path:
            try:
                self.tgisdbase.SetValue(path)
            except UnicodeDecodeError:
                # restore previous state
                # wizard gives error in this case, we just ignore
                path = None
                self.tgisdbase.SetValue(self.gisdbase)
            # if we still have path
            if path:
                self.gisdbase = path
                self.OnSetDatabase(None)
        else:
            # nothing found
            # TODO: should it be warning, hint or message?
            self._showWarning(_(
                'GRASS needs a directory (GRASS database) '
                'in which to store its data. '
                'Create one now if you have not already done so. '
                'A popular choice is "grassdata", located in '
                'your home directory. '
                'Press Browse button to select the directory.'))

    def OnWizard(self, event):
        """Location wizard started"""
        from location_wizard.wizard import LocationWizard
        gWizard = LocationWizard(parent=self,
                                 grassdatabase=self.tgisdbase.GetValue())
        if gWizard.location is not None:
            self.tgisdbase.SetValue(gWizard.grassdatabase)
            self.OnSetDatabase(None)
            self.UpdateMapsets(os.path.join(self.gisdbase, gWizard.location))
            self.lblocations.SetSelection(
                self.listOfLocations.index(
                    gWizard.location))
            self.lbmapsets.SetSelection(0)
            self.SetLocation(self.gisdbase, gWizard.location, 'PERMANENT')
            if gWizard.georeffile:
                message = _("Do you want to import <%(name)s> to the newly created location?") % {
                    'name': gWizard.georeffile}
                dlg = wx.MessageDialog(parent=self, message=message, caption=_(
                    "Import data?"), style=wx.YES_NO | wx.YES_DEFAULT | wx.ICON_QUESTION)
                dlg.CenterOnParent()
                if dlg.ShowModal() == wx.ID_YES:
                    self.ImportFile(gWizard.georeffile)
                dlg.Destroy()
            if gWizard.default_region:
                defineRegion = RegionDef(self, location=gWizard.location)
                defineRegion.CenterOnParent()
                defineRegion.ShowModal()
                defineRegion.Destroy()

            if gWizard.user_mapset:
                self.OnCreateMapset(event)

    def ImportFile(self, filePath):
        """Tries to import file as vector or raster.

        If successfull sets default region from imported map.
        """
        RunCommand('db.connect', flags='c')
        mapName = os.path.splitext(os.path.basename(filePath))[0]
        vectors = RunCommand('v.in.ogr', input=filePath, flags='l',
                             read=True)

        wx.BeginBusyCursor()
        wx.GetApp().Yield()
        if vectors:
            # vector detected
            returncode, error = RunCommand(
                'v.in.ogr', input=filePath, output=mapName, flags='e',
                getErrorMsg=True)
        else:
            returncode, error = RunCommand(
                'r.in.gdal', input=filePath, output=mapName, flags='e',
                getErrorMsg=True)
        wx.EndBusyCursor()

        if returncode != 0:
            GError(
                parent=self,
                message=_(
                    "Import of <%(name)s> failed.\n"
                    "Reason: %(msg)s") % ({
                        'name': filePath,
                        'msg': error}))
        else:
            GMessage(
                message=_(
                    "Data file <%(name)s> imported successfully. "
                    "The location's default region was set from this imported map.") % {
                    'name': filePath},
                parent=self)

    # the event can be refactored out by using lambda in bind
    def OnRenameMapset(self, event):
        """Rename selected mapset
        """
        location = self.listOfLocations[self.lblocations.GetSelection()]
        mapset = self.listOfMapsets[self.lbmapsets.GetSelection()]
        try:
            newmapset = rename_mapset_interactively(self, self.gisdbase,
                                                    location, mapset)
            if newmapset:
                self.OnSelectLocation(None)
                self.lbmapsets.SetSelection(
                        self.listOfMapsets.index(newmapset))
        except Exception as e:
            GError(parent=self,
                   message=_("Unable to rename mapset: %s") % e,
                   showTraceback=False)

    def OnRenameLocation(self, event):
        """Rename selected location
        """
        location = self.listOfLocations[self.lblocations.GetSelection()]
        try:
            newlocation = rename_location_interactively(self, self.gisdbase,
                                                        location)
            if newlocation:
                self.UpdateLocations(self.gisdbase)
                self.lblocations.SetSelection(
                        self.listOfLocations.index(newlocation))
                self.UpdateMapsets(newlocation)
        except Exception as e:
            GError(parent=self,
                   message=_("Unable to rename location: %s") % e,
                   showTraceback=False)

    def OnDeleteMapset(self, event):
        """
        Delete selected mapset
        """
        location = self.listOfLocations[self.lblocations.GetSelection()]
        mapset = self.listOfMapsets[self.lbmapsets.GetSelection()]
        try:
            if (delete_mapset_interactively(self, self.gisdbase,
                                            location, mapset)):
                self.OnSelectLocation(None)
                self.lbmapsets.SetSelection(0)
        except Exception as e:
            GError(parent=self,
                   message=_("Unable to delete mapset: %s") % e,
                   showTraceback=False)

    def OnDeleteLocation(self, event):
        """
        Delete selected location
        """
        location = self.listOfLocations[self.lblocations.GetSelection()]
        try:
            if (delete_location_interactively(self, self.gisdbase, location)):
                self.UpdateLocations(self.gisdbase)
                self.lblocations.SetSelection(0)
                self.OnSelectLocation(None)
                self.lbmapsets.SetSelection(0)
        except Exception as e:
            GError(parent=self,
                   message=_("Unable to delete location: %s") % e,
                   showTraceback=False)

    def OnDownloadLocation(self, event):
        """Download location online"""
        from startup.locdownload import LocationDownloadDialog

        loc_download = LocationDownloadDialog(parent=self, database=self.gisdbase)
        loc_download.ShowModal()
        location = loc_download.GetLocation()
        if location:
            # get the new location to the list
            self.UpdateLocations(self.gisdbase)
            # seems to be used in similar context
            self.UpdateMapsets(os.path.join(self.gisdbase, location))
            self.lblocations.SetSelection(
                self.listOfLocations.index(location))
            # wizard does this as well, not sure if needed
            self.SetLocation(self.gisdbase, location, 'PERMANENT')
            # seems to be used in similar context
            self.OnSelectLocation(None)
        loc_download.Destroy()

    def UpdateLocations(self, dbase):
        """Update list of locations"""
        try:
            self.listOfLocations = GetListOfLocations(dbase)
        except (UnicodeEncodeError, UnicodeDecodeError) as e:
            GError(parent=self,
                   message=_("Unicode error detected. "
                             "Check your locale settings. Details: {0}").format(e),
                   showTraceback=False)

        self.lblocations.Clear()
        self.lblocations.InsertItems(self.listOfLocations, 0)

        if len(self.listOfLocations) > 0:
            self._hideMessage()
            self.lblocations.SetSelection(0)
        else:
            self.lblocations.SetSelection(wx.NOT_FOUND)
            self._showWarning(_("No GRASS Location found in '%s'."
                                " Create a new Location or choose different"
                                " GRASS database directory.")
                              % self.gisdbase)

        return self.listOfLocations

    def UpdateMapsets(self, location):
        """Update list of mapsets"""
        self.FormerMapsetSelection = wx.NOT_FOUND  # for non-selectable item

        self.listOfMapsetsSelectable = list()
        self.listOfMapsets = GetListOfMapsets(self.gisdbase, location)

        self.lbmapsets.Clear()

        # disable mapset with denied permission
        locationName = os.path.basename(location)

        ret = RunCommand('g.mapset',
                         read=True,
                         flags='l',
                         location=locationName,
                         gisdbase=self.gisdbase)

        if ret:
            for line in ret.splitlines():
                self.listOfMapsetsSelectable += line.split(' ')
        else:
            self.SetLocation(self.gisdbase, locationName, "PERMANENT")
            # first run only
            self.listOfMapsetsSelectable = copy.copy(self.listOfMapsets)

        disabled = []
        idx = 0
        for mapset in self.listOfMapsets:
            if mapset not in self.listOfMapsetsSelectable or \
                    get_lockfile_if_present(self.gisdbase,
                                            locationName, mapset):
                disabled.append(idx)
            idx += 1

        self.lbmapsets.InsertItems(self.listOfMapsets, 0, disabled=disabled)

        return self.listOfMapsets

    def OnSelectLocation(self, event):
        """Location selected"""
        if event:
            self.lblocations.SetSelection(event.GetIndex())

        if self.lblocations.GetSelection() != wx.NOT_FOUND:
            self.UpdateMapsets(
                os.path.join(
                    self.gisdbase,
                    self.listOfLocations[
                        self.lblocations.GetSelection()]))
        else:
            self.listOfMapsets = []

        disabled = []
        idx = 0
        try:
            locationName = self.listOfLocations[
                self.lblocations.GetSelection()]
        except IndexError:
            locationName = ''

        for mapset in self.listOfMapsets:
            if mapset not in self.listOfMapsetsSelectable or \
                    get_lockfile_if_present(self.gisdbase,
                                            locationName, mapset):
                disabled.append(idx)
            idx += 1

        self.lbmapsets.Clear()
        self.lbmapsets.InsertItems(self.listOfMapsets, 0, disabled=disabled)

        if len(self.listOfMapsets) > 0:
            self.lbmapsets.SetSelection(0)
            if locationName:
                # enable start button when location and mapset is selected
                self.bstart.Enable()
                self.bstart.SetFocus()
                self.bmapset.Enable()
                # replacing disabled choice, perhaps just mapset needed
                self.rename_location_button.Enable()
                self.delete_location_button.Enable()
                self.rename_mapset_button.Enable()
                self.delete_mapset_button.Enable()
        else:
            self.lbmapsets.SetSelection(wx.NOT_FOUND)
            self.bstart.Enable(False)
            self.bmapset.Enable(False)
            # this all was originally a choice, perhaps just mapset needed
            self.rename_location_button.Enable(False)
            self.delete_location_button.Enable(False)
            self.rename_mapset_button.Enable(False)
            self.delete_mapset_button.Enable(False)

    def OnSelectMapset(self, event):
        """Mapset selected"""
        self.lbmapsets.SetSelection(event.GetIndex())

        if event.GetText() not in self.listOfMapsetsSelectable:
            self.lbmapsets.SetSelection(self.FormerMapsetSelection)
        else:
            self.FormerMapsetSelection = event.GetIndex()
            event.Skip()

    def OnSetDatabase(self, event):
        """Database set"""
        gisdbase = self.tgisdbase.GetValue()
        self._hideMessage()
        if not os.path.exists(gisdbase):
            self._showError(_("Path '%s' doesn't exist.") % gisdbase)
            return

        self.gisdbase = self.tgisdbase.GetValue()
        self.UpdateLocations(self.gisdbase)

        self.OnSelectLocation(None)

    def OnBrowse(self, event):
        """'Browse' button clicked"""
        if not event:
            defaultPath = os.getenv('HOME')
        else:
            defaultPath = ""

        dlg = wx.DirDialog(parent=self, message=_("Choose GIS Data Directory"),
                           defaultPath=defaultPath, style=wx.DD_DEFAULT_STYLE)

        if dlg.ShowModal() == wx.ID_OK:
            self.gisdbase = dlg.GetPath()
            self.tgisdbase.SetValue(self.gisdbase)
            self.OnSetDatabase(event)

        dlg.Destroy()

    def OnCreateMapset(self, event):
        """Create new mapset"""
        gisdbase = self.tgisdbase.GetValue()
        location = self.listOfLocations[self.lblocations.GetSelection()]
        try:
            mapset = create_mapset_interactively(self, gisdbase, location)
            if mapset:
                self.OnSelectLocation(None)
                self.lbmapsets.SetSelection(self.listOfMapsets.index(mapset))
                self.bstart.SetFocus()
        except Exception as e:
            GError(parent=self,
                   message=_("Unable to create new mapset: %s") % e,
                   showTraceback=False)

    def OnStart(self, event):
        """'Start GRASS' button clicked"""
        dbase = self.tgisdbase.GetValue()
        location = self.listOfLocations[self.lblocations.GetSelection()]
        mapset = self.listOfMapsets[self.lbmapsets.GetSelection()]

        lockfile = get_lockfile_if_present(dbase, location, mapset)
        if lockfile:
            dlg = wx.MessageDialog(
                parent=self,
                message=_(
                    "GRASS is already running in selected mapset <%(mapset)s>\n"
                    "(file %(lock)s found).\n\n"
                    "Concurrent use not allowed.\n\n"
                    "Do you want to try to remove .gislock (note that you "
                    "need permission for this operation) and continue?") %
                {'mapset': mapset, 'lock': lockfile},
                caption=_("Lock file found"),
                style=wx.YES_NO | wx.NO_DEFAULT | wx.ICON_QUESTION | wx.CENTRE)

            ret = dlg.ShowModal()
            dlg.Destroy()
            if ret == wx.ID_YES:
                dlg1 = wx.MessageDialog(
                    parent=self,
                    message=_(
                        "ARE YOU REALLY SURE?\n\n"
                        "If you really are running another GRASS session doing this "
                        "could corrupt your data. Have another look in the processor "
                        "manager just to be sure..."),
                    caption=_("Lock file found"),
                    style=wx.YES_NO | wx.NO_DEFAULT | wx.ICON_QUESTION | wx.CENTRE)

                ret = dlg1.ShowModal()
                dlg1.Destroy()

                if ret == wx.ID_YES:
                    try:
                        os.remove(lockfile)
                    except IOError as e:
                        GError(_("Unable to remove '%(lock)s'.\n\n"
                                 "Details: %(reason)s") % {'lock': lockfile, 'reason': e})
                else:
                    return
            else:
                return
        self.SetLocation(dbase, location, mapset)
        self.ExitSuccessfully()

    def SetLocation(self, dbase, location, mapset):
        SetSessionMapset(dbase, location, mapset)

    def ExitSuccessfully(self):
        self.Destroy()
        sys.exit(self.exit_success)

    def OnExit(self, event):
        """'Exit' button clicked"""
        self.Destroy()
        sys.exit(self.exit_user_requested)

    def OnHelp(self, event):
        """'Help' button clicked"""

        # help text in lib/init/helptext.html
        RunCommand('g.manual', entry='helptext')

    def OnCloseWindow(self, event):
        """Close window event"""
        event.Skip()
        sys.exit(self.exit_user_requested)


class GListBox(ListCtrl, listmix.ListCtrlAutoWidthMixin):
    """Use wx.ListCtrl instead of wx.ListBox, different style for
    non-selectable items (e.g. mapsets with denied permission)"""

    def __init__(self, parent, id, size,
                 choices, disabled=[]):
        ListCtrl.__init__(
            self, parent, id, size=size, style=wx.LC_REPORT | wx.LC_NO_HEADER |
            wx.LC_SINGLE_SEL | wx.BORDER_SUNKEN)

        listmix.ListCtrlAutoWidthMixin.__init__(self)

        self.InsertColumn(0, '')

        self.selected = wx.NOT_FOUND

        self._LoadData(choices, disabled)

    def _LoadData(self, choices, disabled=[]):
        """Load data into list

        :param choices: list of item
        :param disabled: list of indices of non-selectable items
        """
        idx = 0
        count = self.GetItemCount()
        for item in choices:
            index = self.InsertItem(count + idx, item)
            self.SetItem(index, 0, item)

            if idx in disabled:
                self.SetItemTextColour(idx, wx.Colour(150, 150, 150))
            idx += 1

    def Clear(self):
        self.DeleteAllItems()

    def InsertItems(self, choices, pos, disabled=[]):
        self._LoadData(choices, disabled)

    def SetSelection(self, item, force=False):
        if item != wx.NOT_FOUND and \
                (platform.system() != 'Windows' or force):
            # Windows -> FIXME
            self.SetItemState(
                item,
                wx.LIST_STATE_SELECTED,
                wx.LIST_STATE_SELECTED)

        self.selected = item

    def GetSelection(self):
        return self.selected


class StartUp(wx.App):
    """Start-up application"""

    def OnInit(self):
        StartUp = GRASSStartup()
        StartUp.CenterOnScreen()
        self.SetTopWindow(StartUp)
        StartUp.Show()
        StartUp.SuggestDatabase()

        return 1


if __name__ == "__main__":
    if os.getenv("GISBASE") is None:
        sys.exit("Failed to start GUI, GRASS GIS is not running.")

    GRASSStartUp = StartUp(0)
    GRASSStartUp.MainLoop()