"""
@package datacatalog::catalog

@brief Data catalog

Classes:
 - datacatalog::DataCatalog

(C) 2014-2018 by Tereza Fiedlerova, and 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 Tereza Fiedlerova
"""

import wx
import os

from core.gthread import gThread
from core.debug import Debug
from datacatalog.tree import DataCatalogTree
from datacatalog.toolbars import DataCatalogToolbar

from grass.pydispatch.signal import Signal


class DataCatalog(wx.Panel):
    """Data catalog panel"""

    def __init__(self, parent, giface=None, id=wx.ID_ANY,
                 title=_("Data catalog"), name='catalog', **kwargs):
        """Panel constructor  """
        self.showNotification = Signal('DataCatalog.showNotification')
        self.changeMapset = Signal('DataCatalog.changeMapset')
        self.changeLocation = Signal('DataCatalog.changeLocation')
        self.parent = parent
        self.baseTitle = title
        wx.Panel.__init__(self, parent=parent, id=id, **kwargs)
        self.SetName("DataCatalog")

        Debug.msg(1, "DataCatalog.__init__()")

        # toolbar
        self.toolbar = DataCatalogToolbar(parent=self)

        # tree with layers
        self.tree = DataCatalogTree(self, giface=giface)
        self.thread = gThread()
        self._loaded = False
        self.tree.showNotification.connect(self.showNotification)
        self.tree.changeMapset.connect(self.changeMapset)
        self.tree.changeLocation.connect(self.changeLocation)

        # some layout
        self._layout()

    def _layout(self):
        """Do layout"""
        sizer = wx.BoxSizer(wx.VERTICAL)

        sizer.Add(self.toolbar, proportion=0,
                  flag=wx.EXPAND)

        sizer.Add(self.tree.GetControl(), proportion=1,
                  flag=wx.EXPAND)

        self.SetAutoLayout(True)
        self.SetSizer(sizer)

        self.Layout()

    def LoadItems(self):
        if self._loaded:
            return

        self.thread.Run(callable=self.tree.InitTreeItems,
                        ondone=lambda event: self.LoadItemsDone())

    def LoadItemsDone(self):
        self._loaded = True
        self.tree.UpdateCurrentDbLocationMapsetNode()
        self.tree.ExpandCurrentMapset()

    def OnReloadTree(self, event):
        """Reload whole tree"""
        self.tree.ReloadTreeItems()
        self.tree.ExpandCurrentMapset()

    def OnReloadCurrentMapset(self, event):
        """Reload current mapset tree only"""
        self.tree.ReloadCurrentMapset()

    def OnAddGrassDB(self, event):
        """Add an existing grass database"""
        dlg = wx.DirDialog(self, _("Choose GRASS data directory:"),
                           os.getcwd(), wx.DD_DEFAULT_STYLE)
        if dlg.ShowModal() == wx.ID_OK:
            grassdatabase = dlg.GetPath()
            self.tree.InsertGrassDb(name=grassdatabase)

        dlg.Destroy()

    def SetRestriction(self, restrict):
        """Allow editing other mapsets or restrict editing to current mapset"""
        self.tree.SetRestriction(restrict)

    def Filter(self, text):
        self.tree.Filter(text=text)