"""
@package iscatt.controllers

@brief Controller layer wx.iscatt.

Classes:
 - controllers::ScattsManager
 - controllers::PlotsRenderingManager
 - controllers::CategoriesManager
 - controllers::IMapWinDigitConnection
 - controllers::IClassDigitConnection
 - controllers::IMapDispConnection
 - controllers::IClassConnection

(C) 2013 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 Stepan Turek <stepan.turek seznam.cz> (mentor: Martin Landa)
"""
import os
import sys
from copy import deepcopy
import wx


from core.gcmd import GException, GError, GMessage, RunCommand, GWarning
from core.settings import UserSettings
from core.gthread import gThread
from iscatt.iscatt_core import Core, idBandsToidScatt, GetRasterInfo, GetRegion, \
    MAX_SCATT_SIZE, WARN_SCATT_SIZE, MAX_NCELLS, WARN_NCELLS
from iscatt.dialogs import AddScattPlotDialog, ExportCategoryRaster
from iclass.dialogs import IClassGroupDialog

import grass.script as grass

from grass.pydispatch.signal import Signal


class ScattsManager:
    """Main controller
    """

    def __init__(self, guiparent, giface, iclass_mapwin=None):
        self.giface = giface
        self.mapDisp = giface.GetMapDisplay()

        if iclass_mapwin:
            self.mapWin = iclass_mapwin
        else:
            self.mapWin = giface.GetMapWindow()

        self.guiparent = guiparent

        self.show_add_scatt_plot = False

        self.core = Core()

        self.cats_mgr = CategoriesManager(self, self.core)
        self.render_mgr = PlotsRenderingManager(scatt_mgr=self,
                                                cats_mgr=self.cats_mgr,
                                                core=self.core)

        self.thread = gThread()

        self.plots = {}

        self.plot_mode = None
        self.pol_sel_mode = [False, None]

        self.data_set = False

        self.cursorPlotMove = Signal("ScattsManager.cursorPlotMove")

        self.renderingStarted = self.render_mgr.renderingStarted
        self.renderingFinished = self.render_mgr.renderingFinished

        self.computingStarted = Signal("ScattsManager.computingStarted")

        if iclass_mapwin:
            self.digit_conn = IClassDigitConnection(self,
                                                    self.mapWin,
                                                    self.core.CatRastUpdater())
            self.iclass_conn = IClassConnection(self,
                                                iclass_mapwin.parent,
                                                self.cats_mgr)
        else:
            self.digit_conn = IMapWinDigitConnection()
            self.iclass_conn = IMapDispConnection(scatt_mgr=self,
                                                  cats_mgr=self.cats_mgr,
                                                  giface=self.giface)

        self._initSettings()

        self.modeSet = Signal("ScattsManager.mondeSet")

    def CleanUp(self):
        self.thread.Terminate()
        # there should be better way hot to clean up the thread
        # than calling the clean up function outside the thread,
        # which still may running
        self.core.CleanUp()

    def CleanUpDone(self):
        for scatt_id, scatt in self.plots.items():
            if scatt['scatt']:
                scatt['scatt'].CleanUp()

        self.plots.clear()

    def _initSettings(self):
        """Initialization of settings (if not already defined)
        """
        # initializes default settings
        initSettings = [
            ['selection', 'sel_pol', (255, 255, 0)],
            ['selection', 'sel_pol_vertex', (255, 0, 0)],
            ['selection', 'sel_area', (0, 255, 19)],
            ['selection', "snap_tresh", 10],
            ['selection', 'sel_area_opacty', 50],
            ['ellipses', 'show_ellips', True],
        ]

        for init in initSettings:
            UserSettings.ReadSettingsFile()
            UserSettings.Append(dict=UserSettings.userSettings,
                                group='scatt',
                                key=init[0],
                                subkey=init[1],
                                value=init[2],
                                overwrite=False)

    def SetData(self):
        self.iclass_conn.SetData()
        self.digit_conn.SetData()

    def SetBands(self, bands):
        self.busy = wx.BusyInfo(_("Loading data..."))
        self.data_set = False
        self.thread.Run(callable=self.core.CleanUp,
                        ondone=lambda event: self.CleanUpDone())

        if self.show_add_scatt_plot:
            show_add = True
        else:
            show_add = False

        self.all_bands_to_bands = dict(zip(bands, [-1] * len(bands)))
        self.all_bands = bands

        self.region = GetRegion()
        ncells = self.region["rows"] * self.region["cols"]

        if ncells > MAX_NCELLS:
            del self.busy
            self.data_set = True
            return

        self.bands = bands[:]
        self.bands_info = {}
        valid_bands = []

        for b in self.bands[:]:
            i = GetRasterInfo(b)

            self.bands_info[b] = i
            if i is not None:
                valid_bands.append(b)

        for i, b in enumerate(valid_bands):
            # name : index in core bands -
            # if not in core bands (not CELL type) -> index = -1
            self.all_bands_to_bands[b] = i

        self.thread.Run(callable=self.core.SetData,
                        bands=valid_bands,
                        ondone=self.SetDataDone,
                        userdata={"show_add": show_add})

    def SetDataDone(self, event):
        del self.busy
        self.data_set = True

        todo = event.ret
        self.bad_bands = event.ret
        bands = self.core.GetBands()

        self.bad_rasts = event.ret
        self.cats_mgr.SetData()
        if event.userdata['show_add']:
            self.AddScattPlot()

    def GetBands(self):
        return self.core.GetBands()

    def AddScattPlot(self):
        if not self.data_set and self.iclass_conn:
            self.show_add_scatt_plot = True
            self.iclass_conn.SetData()
            self.show_add_scatt_plot = False
            return
        if not self.data_set:
            GError(_('No data set.'))
            return

        self.computingStarted.emit()

        bands = self.core.GetBands()

        #added_bands_ids = []
        # for scatt_id in self.plots):
        #    added_bands_ids.append[idBandsToidScatt(scatt_id)]

        self.digit_conn.Update()

        ncells = self.region["rows"] * self.region["cols"]
        if ncells > MAX_NCELLS:
            GError(
                _(
                    parent=self.guiparent, mmessage=_(
                        "Interactive Scatter Plot Tool can not be used.\n"
                        "Number of cells (rows*cols) <%d> in current region"
                        "is higher than maximum limit <%d>.\n\n"
                        "You can reduce number of cells in current region using <g.region> command." %
                        (ncells, MAX_NCELLS))))
            return
        elif ncells > WARN_NCELLS:
            dlg = wx.MessageDialog(
                parent=self.guiparent,
                message=_("Number of cells (rows*cols) <%d> in current region is "
                          "higher than recommended threshold <%d>.\n"
                          "It is strongly advised to reduce number of cells "
                          "in current region below recommend threshold.\n "
                          "It can be done by <g.region> command.\n\n"
                          "Do you want to continue using "
                          "Interactive Scatter Plot Tool with this region?"
                          % (ncells, WARN_NCELLS)),
                style=wx.YES_NO | wx.NO_DEFAULT | wx.ICON_WARNING)
            ret = dlg.ShowModal()
            if ret != wx.ID_YES:
                return

        dlg = AddScattPlotDialog(parent=self.guiparent,
                                 bands=self.all_bands,
                                 check_bands_callback=self.CheckBands)

        if dlg.ShowModal() == wx.ID_OK:

            scatt_ids = []
            sel_bands = dlg.GetBands()

            for b_1, b_2 in sel_bands:
                transpose = False
                if b_1 > b_2:
                    transpose = True
                    tmp_band = b_2
                    b_2 = b_1
                    b_1 = tmp_band

                b_1_id = self.all_bands_to_bands[self.all_bands[b_1]]
                b_2_id = self.all_bands_to_bands[self.all_bands[b_2]]

                scatt_id = idBandsToidScatt(b_1_id, b_2_id, len(bands))
                if scatt_id in self.plots:
                    continue

                self.plots[scatt_id] = {'transpose': transpose,
                                        'scatt': None}
                scatt_ids.append(scatt_id)

            self._addScattPlot(scatt_ids)

        dlg.Destroy()

    def CheckBands(self, b_1, b_2):
        bands = self.core.GetBands()
        added_scatts_ids = self.plots.keys()

        b_1_id = self.all_bands_to_bands[self.all_bands[b_1]]
        b_2_id = self.all_bands_to_bands[self.all_bands[b_1]]

        scatt_id = idBandsToidScatt(b_1_id, b_2_id, len(bands))

        if scatt_id in added_scatts_ids:
            GWarning(
                parent=self.guiparent, message=_(
                    "Scatter plot with same band combination (regardless x y order) "
                    "is already displayed."))
            return False

        b_1_name = self.all_bands[b_1]
        b_2_name = self.all_bands[b_2]

        b_1_i = self.bands_info[b_1_name]
        b_2_i = self.bands_info[b_2_name]

        err = ""
        for b in [b_1_name, b_2_name]:
            if self.bands_info[b] is None:
                err += _("Band <%s> is not CELL (integer) type.\n" % b)
        if err:
            GMessage(parent=self.guiparent,
                     message=_("Scatter plot cannot be added.\n" + err))
            return False

        mrange = b_1_i['range'] * b_2_i['range']
        if mrange > MAX_SCATT_SIZE:
            GWarning(parent=self.guiparent,
                     message=_("Scatter plot cannot be added.\n"
                               "Multiple of bands ranges <%s:%d * %s:%d = %d> "
                               "is higher than maximum limit <%d>.\n"
                               % (b_1_name, b_1_i['range'], b_1_name, b_2_i['range'],
                                  mrange, MAX_SCATT_SIZE)))
            return False
        elif mrange > WARN_SCATT_SIZE:
            dlg = wx.MessageDialog(
                parent=self.guiparent,
                message=_(
                    "Multiple of bands ranges <%s:%d * %s:%d = %d> "
                    "is higher than recommended limit <%d>.\n"
                    "It is strongly advised to reduce range extend of bands"
                    "(e. g. using r.rescale) below recommended threshold.\n\n"
                    "Do you really want to add this scatter plot?" %
                    (b_1_name, b_1_i['range'],
                     b_1_name, b_2_i['range'],
                     mrange, WARN_SCATT_SIZE)),
                style=wx.YES_NO | wx.NO_DEFAULT | wx.ICON_WARNING)
            ret = dlg.ShowModal()
            if ret != wx.ID_YES:
                return False

        return True

    def _addScattPlot(self, scatt_ids):
        self.render_mgr.NewRunningProcess()
        self.thread.Run(callable=self.core.AddScattPlots,
                        scatt_ids=scatt_ids, ondone=self.AddScattPlotDone)

    def AddScattPlotDone(self, event):
        if not self.data_set:
            return

        scatt_ids = event.kwds['scatt_ids']
        for s_id in scatt_ids:
            trans = self.plots[s_id]['transpose']

            self.plots[s_id]['scatt'] = self.guiparent.NewScatterPlot(
                scatt_id=s_id, transpose=trans)

            self.plots[s_id]['scatt'].plotClosed.connect(self.PlotClosed)
            self.plots[s_id]['scatt'].cursorMove.connect(
                lambda x, y, scatt_id:
                self.cursorPlotMove.emit(x=x, y=y,
                                         scatt_id=scatt_id))

            if self.plot_mode:
                self.plots[s_id]['scatt'].SetMode(self.plot_mode)
                self.plots[s_id]['scatt'].ZoomToExtend()

        self.render_mgr.RunningProcessDone()

    def PlotClosed(self, scatt_id):
        del self.plots[scatt_id]

    def SetPlotsMode(self, mode):

        self.plot_mode = mode
        for scatt in self.plots.itervalues():
            if scatt['scatt']:
                scatt['scatt'].SetMode(mode)

        self.modeSet.emit(mode=mode)

    def ActivateSelectionPolygonMode(self, activate):
        self.pol_sel_mode[0] = activate
        for scatt in self.plots.itervalues():
            if not scatt['scatt']:
                continue
            scatt['scatt'].SetSelectionPolygonMode(activate)
            if not activate and self.plot_mode not in [
                    'zoom', 'pan', 'zoom_extend']:
                self.SetPlotsMode(None)

        self.render_mgr.RunningProcessDone()
        return activate

    def ProcessSelectionPolygons(self, process_mode):
        scatts_polygons = {}
        for scatt_id, scatt in self.plots.iteritems():
            if not scatt['scatt']:
                continue
            coords = scatt['scatt'].GetCoords()
            if coords is not None:
                scatts_polygons[scatt_id] = coords

        if not scatts_polygons:
            return

        value = 1
        if process_mode == 'remove':
            value = 0

        sel_cat_id = self.cats_mgr.GetSelectedCat()
        if not sel_cat_id:
            dlg = wx.MessageDialog(
                parent=self.guiparent,
                message=_(
                    "In order to select arrea in scatter plot, "
                    "you have to select class first.\n\n"
                    "There is no class yet, "
                    "do you want to create one?"),
                caption=_("No class selected"),
                style=wx.YES_NO)
            if dlg.ShowModal() == wx.ID_YES:
                self.iclass_conn.EmptyCategories()

        sel_cat_id = self.cats_mgr.GetSelectedCat()
        if not sel_cat_id:
            return

        for scatt in self.plots.itervalues():
            if scatt['scatt']:
                scatt['scatt'].SetEmpty()

        self.computingStarted.emit()

        self.render_mgr.NewRunningProcess()
        self.render_mgr.CategoryChanged(cat_ids=[sel_cat_id])
        self.render_mgr.CategoryCondsChanged(cat_ids=[sel_cat_id])

        self.thread.Run(callable=self.core.UpdateCategoryWithPolygons,
                        cat_id=sel_cat_id,
                        scatts_pols=scatts_polygons,
                        value=value, ondone=self.SetEditCatDataDone)

    def SetEditCatDataDone(self, event):
        if not self.data_set:
            return

        self.render_mgr.RunningProcessDone()
        if event.exception:
            GError(
                _("Error occurred during computation of scatter plot category:\n%s"),
                parent=self.guiparent,
                showTraceback=False)

        cat_id = event.ret
        self.iclass_conn.RenderCatRast(cat_id)

    def SettingsUpdated(self, chanaged_setts):
        self.render_mgr.RenderRequest()

        #['ellipses', 'show_ellips']
    def GetCategoriesManager(self):
        return self.cats_mgr


class PlotsRenderingManager:
    """Manages rendering of scatter plot.

    .. todo::
        still space for optimalization
    """

    def __init__(self, scatt_mgr, cats_mgr, core):
        self.scatt_mgr = scatt_mgr
        self.cats_mgr = cats_mgr
        self.core = core
        self.scatts_dt, self.scatt_conds_dt = self.core.GetScattsData()

        self.runningProcesses = 0

        self.data_to_render = {}
        self.render_queue = []

        self.cat_ids = []
        self.cat_cond_ids = []

        self.renderingStarted = Signal("ScattsManager.renderingStarted")
        self.renderingFinished = Signal("ScattsManager.renderingFinished")

    def AddRenderRequest(self, scatts):
        for scatt_id, cat_ids in scatts:
            if not self.data_to_render.has_key[scatt_id]:
                self.data_to_render = cat_ids
            else:
                for c in cat_ids:
                    if c not in self.data_to_render[scatt_id]:
                        self.data_to_render[scatt_id].append(c)

    def NewRunningProcess(self):
        self.runningProcesses += 1

    def RunningProcessDone(self):
        self.runningProcesses -= 1
        if self.runningProcesses <= 1:
            self.RenderScattPlts()

    def RenderRequest(self):
        if self.runningProcesses <= 1:
            self.RenderScattPlts()

    def CategoryChanged(self, cat_ids):
        for c in cat_ids:
            if c not in self.cat_ids:
                self.cat_ids.append(c)

    def CategoryCondsChanged(self, cat_ids):
        for c in cat_ids:
            if c not in self.cat_cond_ids:
                self.cat_cond_ids.append(c)

    def RenderScattPlts(self, scatt_ids=None):
        if len(self.render_queue) > 1:
            return

        self.renderingStarted.emit()
        self.render_queue.append(self.scatt_mgr.thread.GetId())

        cats_attrs = deepcopy(self.cats_mgr.GetCategoriesAttrs())
        cats = self.cats_mgr.GetCategories()[:]
        self.scatt_mgr.thread.Run(
            callable=self._renderscattplts,
            scatt_ids=scatt_ids,
            cats=cats,
            cats_attrs=cats_attrs,
            ondone=self.RenderingDone)

    def _renderscattplts(self, scatt_ids, cats, cats_attrs):
        cats.reverse()
        cats.insert(0, 0)
        for i_scatt_id, scatt in self.scatt_mgr.plots.items():
            if scatt_ids is not None and \
               i_scatt_id not in scatt_ids:
                continue
            if not scatt['scatt']:
                continue

            scatt_dt = self.scatts_dt.GetScatt(i_scatt_id)
            if self._showConfEllipses():
                ellipses_dt = self.scatts_dt.GetEllipses(
                    i_scatt_id, cats_attrs)
            else:
                ellipses_dt = {}

            for c in scatt_dt.iterkeys():
                try:
                    self.cat_ids.remove(c)
                    scatt_dt[c]['render'] = True
                except:
                    scatt_dt[c]['render'] = False

            if self.scatt_mgr.pol_sel_mode[0]:
                self._getSelectedAreas(cats, i_scatt_id, scatt_dt, cats_attrs)

            scatt['scatt'].Plot(cats_order=cats,
                                scatts=scatt_dt,
                                ellipses=ellipses_dt,
                                styles=cats_attrs)

    def RenderingDone(self, event):
        self.render_queue.remove(event.pid)
        if not self.render_queue:
            self.renderingFinished.emit()

    def _getSelectedAreas(self, cats_order, scatt_id, scatt_dt, cats_attrs):

        cat_id = self.cats_mgr.GetSelectedCat()
        if not cat_id:
            return

        sel_a_cat_id = -1

        s = self.scatt_conds_dt.GetScatt(scatt_id, [cat_id])
        if not s:
            return

        cats_order.append(sel_a_cat_id)

        col = UserSettings.Get(group='scatt',
                               key='selection',
                               subkey='sel_area')

        col = ":".join(map(str, col))
        opac = UserSettings.Get(group='scatt',
                                key='selection',
                                subkey='sel_area_opacty') / 100.0

        cats_attrs[sel_a_cat_id] = {'color': col,
                                    'opacity': opac,
                                    'show': True}

        scatt_dt[sel_a_cat_id] = s[cat_id]

        scatt_dt[sel_a_cat_id]['render'] = False
        if cat_id in self.cat_cond_ids:
            scatt_dt[sel_a_cat_id]['render'] = True
            self.cat_cond_ids.remove(cat_id)

    def _showConfEllipses(self):
        return UserSettings.Get(group='scatt',
                                key="ellipses",
                                subkey="show_ellips")


class CategoriesManager:
    """Manages categories list of scatter plot.
    """

    def __init__(self, scatt_mgr, core):

        self.core = core
        self.scatt_mgr = scatt_mgr

        self.cats = {}
        self.cats_ids = []

        self.sel_cat_id = None

        self.exportRaster = None

        self.initialized = Signal('CategoriesManager.initialized')
        self.setCategoryAttrs = Signal('CategoriesManager.setCategoryAttrs')
        self.deletedCategory = Signal('CategoriesManager.deletedCategory')
        self.addedCategory = Signal('CategoriesManager.addedCategory')

    def ChangePosition(self, cat_id, new_pos):
        if new_pos >= len(self.cats_ids):
            return False

        try:
            pos = self.cats_ids.index(cat_id)
        except:
            return False

        if pos > new_pos:
            pos -= 1

        self.cats_ids.remove(cat_id)

        self.cats_ids.insert(new_pos, cat_id)

        self.scatt_mgr.render_mgr.RenderRequest()
        return True

    def _addCategory(self, cat_id):
        self.scatt_mgr.thread.Run(callable=self.core.AddCategory,
                                  cat_id=cat_id)

    def SetData(self):

        if not self.scatt_mgr.data_set:
            return

        for cat_id in self.cats_ids:
            self.scatt_mgr.thread.Run(callable=self.core.AddCategory,
                                      cat_id=cat_id)

    def AddCategory(self, cat_id=None, name=None, color=None, nstd=None):

        if cat_id is None:
            if self.cats_ids:
                cat_id = max(self.cats_ids) + 1
            else:
                cat_id = 1

        if self.scatt_mgr.data_set:
            self.scatt_mgr.thread.Run(callable=self.core.AddCategory,
                                      cat_id=cat_id)
            # TODO check number of cats
            # if ret < 0: #TODO
            #    return -1;

        self.cats[cat_id] = {
            'name': 'class_%d' % cat_id,
            'color': "0:0:0",
            'opacity': 1.0,
            'show': True,
            'nstd': 1.0,
        }

        self.cats_ids.insert(0, cat_id)

        if name is not None:
            self.cats[cat_id]["name"] = name

        if color is not None:
            self.cats[cat_id]["color"] = color

        if nstd is not None:
            self.cats[cat_id]["nstd"] = nstd

        self.addedCategory.emit(cat_id=cat_id,
                                name=self.cats[cat_id]["name"],
                                color=self.cats[cat_id]["color"])
        return cat_id

    def SetCategoryAttrs(self, cat_id, attrs_dict):
        render = False
        update_cat_rast = []

        for k, v in attrs_dict.iteritems():
            if not render and k in ['color', 'opacity', 'show', 'nstd']:
                render = True
            if k in ['color', 'name']:
                update_cat_rast.append(k)

            self.cats[cat_id][k] = v

        if render:
            self.scatt_mgr.render_mgr.CategoryChanged(cat_ids=[cat_id])
            self.scatt_mgr.render_mgr.RenderRequest()

        if update_cat_rast:
            self.scatt_mgr.iclass_conn.UpdateCategoryRaster(
                cat_id, update_cat_rast)

        self.setCategoryAttrs.emit(cat_id=cat_id, attrs_dict=attrs_dict)

    def DeleteCategory(self, cat_id):

        if self.scatt_mgr.data_set:
            self.scatt_mgr.thread.Run(callable=self.core.DeleteCategory,
                                      cat_id=cat_id)
        del self.cats[cat_id]
        self.cats_ids.remove(cat_id)

        self.deletedCategory.emit(cat_id=cat_id)

    # TODO emit event?
    def SetSelectedCat(self, cat_id):
        self.sel_cat_id = cat_id
        if self.scatt_mgr.pol_sel_mode[0]:
            self.scatt_mgr.render_mgr.RenderRequest()

    def GetSelectedCat(self):
        return self.sel_cat_id

    def GetCategoryAttrs(self, cat_id):
        #TODO is mutable
        return self.cats[cat_id]

    def GetCategoriesAttrs(self):
        #TODO is mutable
        return self.cats

    def GetCategories(self):
        return self.cats_ids[:]

    def SetCategoryPosition(self):
        if newindex > oldindex:
            newindex -= 1

        self.cats_ids.insert(newindex, self.cats_ids.pop(oldindex))

    def ExportCatRast(self, cat_id):

        cat_attrs = self.GetCategoryAttrs(cat_id)

        dlg = ExportCategoryRaster(
            parent=self.scatt_mgr.guiparent,
            rasterName=self.exportRaster,
            title=_("Export scatter plot raster of class <%s>") %
            cat_attrs['name'])

        if dlg.ShowModal() == wx.ID_OK:
            self.exportCatRast = dlg.GetRasterName()
            dlg.Destroy()

            self.scatt_mgr.thread.Run(callable=self.core.ExportCatRast,
                                      userdata={'name': cat_attrs['name']},
                                      cat_id=cat_id,
                                      rast_name=self.exportCatRast,
                                      ondone=self.OnExportCatRastDone)

    def OnExportCatRastDone(self, event):
        ret, err = event.ret
        if ret == 0:
            cat_attrs = self.GetCategoryAttrs(event.kwds['cat_id'])
            GMessage(
                _("Scatter plot raster of class <%s> exported to raster map <%s>.") %
                (event.userdata['name'], event.kwds['rast_name']))
        else:
            GMessage(
                _("Export of scatter plot raster of class <%s> to map <%s> failed.\n%s") %
                (event.userdata['name'], event.kwds['rast_name'], err))


class IMapWinDigitConnection:
    """Manage communication of the scatter plot with digitizer in
    mapwindow (does not work).
    """

    def Update(self):
        pass

    def SetData(self):
        pass


class IClassDigitConnection:
    """Manages communication of the scatter plot with digitizer in
    wx.iclass.
    """

    def __init__(self, scatt_mgr, mapWin, scatt_rast_updater):
        self.mapWin = mapWin
        self.vectMap = None
        self.scatt_rast_updater = scatt_rast_updater
        self.scatt_mgr = scatt_mgr
        self.cats_mgr = scatt_mgr.cats_mgr

        self.cats_to_update = []
        self.pids = {'mapwin_conn': []}

        self.thread = self.scatt_mgr.thread

        # TODO
        self.mapWin.parent.toolbars[
            "vdigit"].editingStarted.connect(self.DigitDataChanged)

    def Update(self):
        self.thread.Run(callable=self.scatt_rast_updater.SyncWithMap)

    def SetData(self):
        self.cats_to_update = []
        self.pids = {'mapwin_conn': []}

    def _connectSignals(self):
        self.digit.featureAdded.connect(self.AddFeature)
        self.digit.areasDeleted.connect(self.DeleteAreas)
        self.digit.featuresDeleted.connect(self.DeleteAreas)
        self.digit.vertexMoved.connect(self.EditedFeature)
        self.digit.vertexRemoved.connect(self.EditedFeature)
        self.digit.lineEdited.connect(self.EditedFeature)
        self.digit.featuresMoved.connect(self.EditedFeature)

    def AddFeature(self, new_bboxs, new_areas_cats):
        if not self.scatt_mgr.data_set:
            return
        self.scatt_mgr.computingStarted.emit()

        self.pids['mapwin_conn'].append(self.thread.GetId())
        self.thread.Run(callable=self.scatt_rast_updater.EditedFeature,
                        new_bboxs=new_bboxs,
                        old_bboxs=[],
                        old_areas_cats=[],
                        new_areas_cats=new_areas_cats,
                        ondone=self.OnDone)

    def DeleteAreas(self, old_bboxs, old_areas_cats):
        if not self.scatt_mgr.data_set:
            return
        self.scatt_mgr.computingStarted.emit()

        self.pids['mapwin_conn'].append(self.thread.GetId())
        self.thread.Run(callable=self.scatt_rast_updater.EditedFeature,
                        new_bboxs=[],
                        old_bboxs=old_bboxs,
                        old_areas_cats=old_areas_cats,
                        new_areas_cats=[],
                        ondone=self.OnDone)

    def EditedFeature(self, new_bboxs, new_areas_cats,
                      old_bboxs, old_areas_cats):
        if not self.scatt_mgr.data_set:
            return
        self.scatt_mgr.computingStarted.emit()

        self.pids['mapwin_conn'].append(self.thread.GetId())
        self.thread.Run(callable=self.scatt_rast_updater.EditedFeature,
                        new_bboxs=new_bboxs,
                        old_bboxs=old_bboxs,
                        old_areas_cats=old_areas_cats,
                        new_areas_cats=new_areas_cats,
                        ondone=self.OnDone)

    def DigitDataChanged(self, vectMap, digit):

        self.digit = digit
        self.vectMap = vectMap

        self.digit.EmitSignals(emit=True)

        self.scatt_rast_updater.SetVectMap(vectMap)

        self._connectSignals()

    def OnDone(self, event):
        if not self.scatt_mgr.data_set:
            return
        self.pids['mapwin_conn'].remove(event.pid)
        updated_cats = event.ret
        for cat in updated_cats:
            if cat not in self.cats_to_update:
                self.cats_to_update.append(cat)

        if not self.pids['mapwin_conn']:
            self.thread.Run(
                callable=self.scatt_mgr.core.ComputeCatsScatts,
                cats_ids=self.cats_to_update[:],
                ondone=self.Render)
            del self.cats_to_update[:]

    def Render(self, event):
        self.scatt_mgr.render_mgr.RenderScattPlts()


class IMapDispConnection:
    """Manage comunication of the scatter plot with mapdisplay in mapwindow.
    """

    def __init__(self, scatt_mgr, cats_mgr, giface):
        self.scatt_mgr = scatt_mgr
        self.cats_mgr = cats_mgr
        self.set_g = {'group': None, 'subg': None}
        self.giface = giface
        self.added_cats_rasts = {}

    def SetData(self):

        dlg = IClassGroupDialog(self.scatt_mgr.guiparent,
                                group=self.set_g['group'],
                                subgroup=self.set_g['subg'])

        bands = []
        while True:
            if dlg.ShowModal() == wx.ID_OK:

                bands = dlg.GetGroupBandsErr(parent=self.scatt_mgr.guiparent)
                if bands:
                    name, s = dlg.GetData()
                    group = grass.find_file(name=name, element='group')
                    self.set_g['group'] = group['name']
                    self.set_g['subg'] = s

                    break
            else:
                break

        dlg.Destroy()
        self.added_cats_rasts = {}

        if bands:
            self.scatt_mgr.SetBands(bands)

    def EmptyCategories(self):
        return None

    def UpdateCategoryRaster(self, cat_id, attrs, render=True):

        cat_rast = self.scatt_mgr.core.GetCatRast(cat_id)
        if not grass.find_file(cat_rast, element='cell', mapset='.')['file']:
            return
        cats_attrs = self.cats_mgr.GetCategoryAttrs(cat_id)

        if "color" in attrs:
            ret, err_msg = RunCommand('r.colors',
                                      map=cat_rast,
                                      rules="-",
                                      stdin="1 %s" % cats_attrs["color"],
                                      getErrorMsg=True)

            if ret != 0:
                GError("r.colors failed\n%s" % err_msg)
            if render:
                self.giface.updateMap.emit()

        if "name" in attrs:
            # TODO hack
            self.giface.GetLayerList()._tree.SetItemText(
                self.added_cats_rasts[cat_id], cats_attrs['name'])
            cats_attrs["name"]

    def RenderCatRast(self, cat_id):

        if not cat_id in self.added_cats_rasts.iterkeys():
            cat_rast = self.scatt_mgr.core.GetCatRast(cat_id)

            cat_name = self.cats_mgr.GetCategoryAttrs(cat_id)['name']
            self.UpdateCategoryRaster(cat_id, ['color'], render=False)

            cmd = ['d.rast', 'map=%s' % cat_rast]
            # TODO HACK
            layer = self.giface.GetLayerList()._tree.AddLayer(ltype="raster",
                                                              lname=cat_name,
                                                              lcmd=cmd,
                                                              lchecked=True)
            self.added_cats_rasts[cat_id] = layer
        else:  # TODO settings
            self.giface.updateMap.emit()


class IClassConnection:
    """Manage comunication of the scatter plot with mapdisplay in wx.iclass.
    """

    def __init__(self, scatt_mgr, iclass_frame, cats_mgr):
        self.iclass_frame = iclass_frame
        self.stats_data = self.iclass_frame.stats_data
        self.cats_mgr = cats_mgr
        self.scatt_mgr = scatt_mgr
        self.added_cats_rasts = []

        self.stats_data.statisticsAdded.connect(self.AddCategory)
        self.stats_data.statisticsDeleted.connect(self.DeleteCategory)
        self.stats_data.allStatisticsDeleted.connect(self.DeletAllCategories)
        self.stats_data.statisticsSet.connect(self.SetCategory)

        self.iclass_frame.groupSet.connect(self.GroupSet)

        self.cats_mgr.setCategoryAttrs.connect(self.SetStatistics)
        self.cats_mgr.deletedCategory.connect(self.DeleteStatistics)
        self.cats_mgr.addedCategory.connect(self.AddStatistics)

        self.iclass_frame.categoryChanged.connect(self.CategoryChanged)

        self.SyncCats()

    def UpdateCategoryRaster(self, cat_id, attrs, render=True):
        if not self.scatt_mgr.data_set:
            return

        cat_rast = self.scatt_mgr.core.GetCatRast(cat_id)
        if not cat_rast:
            return

        if not grass.find_file(cat_rast, element='cell', mapset='.')['file']:
            return
        cats_attrs = self.cats_mgr.GetCategoryAttrs(cat_id)
        train_mgr, preview_mgr = self.iclass_frame.GetMapManagers()

        if "color" in attrs:
            ret, err_msg = RunCommand('r.colors',
                                      map=cat_rast,
                                      rules="-",
                                      stdin="1 %s" % cats_attrs["color"],
                                      getErrorMsg=True)

            if ret != 0:
                GError("r.colors failed\n%s" % err_msg)
            if render:
                train_mgr.Render()

        if "name" in attrs:
            cat_rast = self.scatt_mgr.core.GetCatRast(cat_id)

            train_mgr.SetAlias(original=cat_rast, alias=cats_attrs['name'])
            cats_attrs["name"]

    def RenderCatRast(self, cat_id):

        train_mgr, preview_mgr = self.iclass_frame.GetMapManagers()
        if not cat_id in self.added_cats_rasts:
            cat_rast = self.scatt_mgr.core.GetCatRast(cat_id)

            cat_name = self.cats_mgr.GetCategoryAttrs(cat_id)['name']
            self.UpdateCategoryRaster(cat_id, ['color'], render=False)
            train_mgr.AddLayer(cat_rast, alias=cat_name)

            self.added_cats_rasts.append(cat_id)
        else:  # TODO settings
            train_mgr.Render()

    def SetData(self):
        self.iclass_frame.AddBands()
        self.added_cats_rasts = []

    def EmptyCategories(self):
        self.iclass_frame.OnCategoryManager(None)

    def SyncCats(self, cats_ids=None):
        self.cats_mgr.addedCategory.disconnect(self.AddStatistics)
        cats = self.stats_data.GetCategories()
        for c in cats:
            if cats_ids and c not in cats_ids:
                continue
            stats = self.stats_data.GetStatistics(c)
            self.cats_mgr.AddCategory(c, stats.name, stats.color, stats.nstd)
        self.cats_mgr.addedCategory.connect(self.AddStatistics)

    def CategoryChanged(self, cat):
        self.cats_mgr.SetSelectedCat(cat)

    def AddCategory(self, cat, name, color):
        self.cats_mgr.addedCategory.disconnect(self.AddStatistics)
        stats = self.stats_data.GetStatistics(cat)
        self.cats_mgr.AddCategory(
            cat_id=cat,
            name=name,
            color=color,
            nstd=stats.nstd)
        self.cats_mgr.addedCategory.connect(self.AddStatistics)

    def DeleteCategory(self, cat):
        self.cats_mgr.deletedCategory.disconnect(self.DeleteStatistics)
        self.cats_mgr.DeleteCategory(cat)
        self.cats_mgr.deletedCategory.connect(self.DeleteStatistics)

    def DeletAllCategories(self):

        self.cats_mgr.deletedCategory.disconnect(self.DeleteStatistics)
        cats = self.stats_data.GetCategories()
        for c in cats:
            self.cats_mgr.DeleteCategory(c)
        self.cats_mgr.deletedCategory.connect(self.DeleteStatistics)

    def SetCategory(self, cat, stats):

        self.cats_mgr.setCategoryAttrs.disconnect(self.SetStatistics)
        cats_attr = {}

        for attr in ['name', 'color', 'nstd']:
            if attr in stats:
                cats_attr[attr] = stats[attr]

        if cats_attr:
            self.cats_mgr.SetCategoryAttrs(cat, cats_attr)
        self.cats_mgr.setCategoryAttrs.connect(self.SetStatistics)

    def SetStatistics(self, cat_id, attrs_dict):
        self.stats_data.statisticsSet.disconnect(self.SetCategory)
        self.stats_data.GetStatistics(cat_id).SetStatistics(attrs_dict)
        self.stats_data.statisticsSet.connect(self.SetCategory)

    def AddStatistics(self, cat_id, name, color):
        self.stats_data.statisticsAdded.disconnect(self.AddCategory)
        self.stats_data.AddStatistics(cat_id, name, color)
        self.stats_data.statisticsAdded.connect(self.AddCategory)

    def DeleteStatistics(self, cat_id):
        self.stats_data.statisticsDeleted.disconnect(self.DeleteCategory)
        self.stats_data.DeleteStatistics(cat_id)
        self.stats_data.statisticsDeleted.connect(self.DeleteCategory)

    def GroupSet(self, group, subgroup):
        kwargs = {}
        if subgroup:
            kwargs['subgroup'] = subgroup

        res = RunCommand('i.group',
                         flags='g',
                         group=group,
                         read=True, **kwargs).strip()

        if res.splitlines()[0]:
            bands = res.splitlines()
            self.scatt_mgr.SetBands(bands)
