"""
@package iscatt.dialogs

@brief Dialogs widgets.

Classes:
 - dialogs::AddScattPlotDialog
 - dialogs::ExportCategoryRaster
 - dialogs::SettingsDialog
 - dialogs::ManageBusyCursorMixin
 - dialogs::RenameClassDialog

(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

import wx
from iscatt.iscatt_core import idBandsToidScatt
from gui_core.gselect import Select
import wx.lib.colourselect as csel

import grass.script as grass

from core import globalvar
from core.gcmd import GMessage
from core.settings import UserSettings
from gui_core.dialogs import SimpleDialog

class AddScattPlotDialog(wx.Dialog):

    def __init__(self, parent, bands, check_bands_callback, id  = wx.ID_ANY):
        wx.Dialog.__init__(self, parent, title = _("Add scatter plots"), id = id)

        self.bands = bands

        self.x_band = None
        self.y_band = None

        self.chb_callback = check_bands_callback

        self.added_bands_ids = []
        self.sel_bands_ids = []
        self._createWidgets()

    def _createWidgets(self):

        self.labels = {}
        self.params = {}

        self.band_1_label = wx.StaticText(parent = self, id = wx.ID_ANY, label = _("x axis:"))

        self.band_1_ch = wx.ComboBox(parent = self, id = wx.ID_ANY,
                                     choices = self.bands,
                                     style = wx.CB_READONLY, size = (350, 30))

        self.band_2_label = wx.StaticText(parent = self, id = wx.ID_ANY, label = _("y axis:"))

        self.band_2_ch = wx.ComboBox(parent = self, id = wx.ID_ANY,
                                     choices = self.bands,
                                     style = wx.CB_READONLY, size = (350, 30))

        self.scattsBox = wx.ListBox(parent = self,  id = wx.ID_ANY, size = (-1, 150),
                                    style = wx.LB_MULTIPLE | wx.LB_NEEDED_SB)

        # buttons
        self.btn_add = wx.Button(parent=self, id=wx.ID_ADD)
        self.btn_remove = wx.Button(parent=self, id=wx.ID_REMOVE)
        
        self.btn_close = wx.Button(parent=self, id=wx.ID_CANCEL)        
        self.btn_ok = wx.Button(parent=self, id=wx.ID_OK)

        self._layout()

    def _layout(self):

        border = wx.BoxSizer(wx.VERTICAL) 
        dialogSizer = wx.BoxSizer(wx.VERTICAL)

        regionSizer = wx.BoxSizer(wx.HORIZONTAL)

        dialogSizer.Add(item = self._addSelectSizer(title = self.band_1_label, 
                                                    sel = self.band_1_ch))

        dialogSizer.Add(item = self._addSelectSizer(title = self.band_2_label, 
                                                    sel = self.band_2_ch))


        dialogSizer.Add(item=self.btn_add, proportion=0,  flag = wx.TOP | wx.ALIGN_RIGHT, border = 5)

        box = wx.StaticBox(self, id = wx.ID_ANY,
                           label = " %s " % _("Bands of scatter plots to be added (x y):"))
        sizer = wx.StaticBoxSizer(box, wx.VERTICAL)

        sizer.Add(item=self.scattsBox, proportion=1, flag=wx.EXPAND | wx.TOP, border=5)
        sizer.Add(item=self.btn_remove, proportion=0, flag=wx.TOP | wx.ALIGN_RIGHT, border = 5)

        dialogSizer.Add(item=sizer, proportion=1,  flag = wx.EXPAND | wx.TOP, border = 5)

        # buttons
        self.btnsizer = wx.BoxSizer(orient = wx.HORIZONTAL)

        self.btnsizer.Add(item = self.btn_close, proportion = 0,
                          flag = wx.RIGHT | wx.LEFT | wx.ALIGN_CENTER,
                          border = 10)
        
        self.btnsizer.Add(item = self.btn_ok, proportion = 0,
                          flag = wx.RIGHT | wx.LEFT | wx.ALIGN_CENTER,
                          border = 10)

        dialogSizer.Add(item = self.btnsizer, proportion = 0,
                        flag = wx.ALIGN_CENTER | wx.TOP, border = 5)

        border.Add(item = dialogSizer, proportion = 0,
                   flag = wx.LEFT | wx.RIGHT | wx.BOTTOM, border = 10)

        self.SetSizer(border)
        self.Layout()
        self.Fit()

        # bindings
        self.btn_close.Bind(wx.EVT_BUTTON, self.OnClose)
        self.btn_ok.Bind(wx.EVT_BUTTON, self.OnOk)
        self.btn_add.Bind(wx.EVT_BUTTON, self.OnAdd)
        self.btn_remove.Bind(wx.EVT_BUTTON, self.OnRemoveLayer)

    def OnOk(self, event):
        
        if not self.GetBands():
            GMessage(parent=self, message=_("No scatter plots selected."))
            return

        event.Skip()

    def _addSelectSizer(self, title, sel): 
        """Helper layout function.
        """
        selSizer = wx.BoxSizer(orient = wx.VERTICAL)

        selTitleSizer = wx.BoxSizer(wx.HORIZONTAL)
        selTitleSizer.Add(item = title, proportion = 1,
                          flag = wx.TOP | wx.EXPAND, border = 5)

        selSizer.Add(item = selTitleSizer, proportion = 0,
                     flag = wx.EXPAND)

        selSizer.Add(item = sel, proportion = 1,
                     flag = wx.EXPAND | wx.TOP| wx.ALIGN_CENTER_VERTICAL,
                     border = 5)

        return selSizer

    def GetBands(self):
        """Get layers"""
        return self.sel_bands_ids

    def OnClose(self, event):
        """Close dialog
        """
        if not self.IsModal():
            self.Destroy()
        event.Skip()

    def OnRemoveLayer(self, event):
        """Remove layer from listbox"""
        while self.scattsBox.GetSelections():
            sel = self.scattsBox.GetSelections()[0]
            self.scattsBox.Delete(sel)
            self.sel_bands_ids.pop(sel)

    def OnAdd(self, event):
        """
        """
        b_x = self.band_1_ch.GetSelection()
        b_y = self.band_2_ch.GetSelection()

        if b_x < 0 or b_y < 0:
            GMessage(parent=self, message=_("Select both x and y bands."))
            return
        if b_y == b_x:
            GMessage(parent=self, message=_("Selected bands must be different."))
            return

        if [b_x, b_y] in self.sel_bands_ids or [b_y, b_x] in self.sel_bands_ids:
            GMessage(parent=self, 
                     message=_("Scatter plot with same bands combination (regardless x y order) " 
                               "has been already added into the list."))
            return

        if not self.chb_callback(b_x, b_y):
            return

        self.sel_bands_ids.append([b_x, b_y])

        b_x_str = self.band_1_ch.GetStringSelection()
        b_y_str = self.band_2_ch.GetStringSelection()

        text = b_x_str + " " + b_y_str

        self.scattsBox.Append(text)
        event.Skip()

class ExportCategoryRaster(wx.Dialog):
    def __init__(self, parent, title, rasterName = None, id = wx.ID_ANY,
                 style = wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER,
                 **kwargs):
        """Dialog for export of category raster.
        
        :param parent: window
        :param str rasterName name of vector layer for export
        :param title: window title
        """
        wx.Dialog.__init__(self, parent, id, title, style = style, **kwargs)
        
        self.rasterName = rasterName
        self.panel = wx.Panel(parent = self, id = wx.ID_ANY)
        
        self.btnCancel = wx.Button(parent = self.panel, id = wx.ID_CANCEL)
        self.btnOK     = wx.Button(parent = self.panel, id = wx.ID_OK)
        self.btnOK.SetDefault()
        self.btnOK.Enable(False)
        self.btnOK.Bind(wx.EVT_BUTTON, self.OnOK)
        
        self.__layout()
        
        self.vectorNameCtrl.Bind(wx.EVT_TEXT, self.OnTextChanged)
        self.OnTextChanged(None)
        wx.CallAfter(self.vectorNameCtrl.SetFocus)

    def OnTextChanged(self, event):
        """Name of new vector map given.
        
        Enable/diable OK button.
        """
        file = self.vectorNameCtrl.GetValue()
        if len(file) > 0:
            self.btnOK.Enable(True)
        else:
            self.btnOK.Enable(False)
        
    def __layout(self):
        """Do layout"""
        sizer = wx.BoxSizer(wx.VERTICAL)
        
        dataSizer = wx.BoxSizer(wx.VERTICAL)
        
        dataSizer.Add(item = wx.StaticText(parent = self.panel, id = wx.ID_ANY,
                                           label = _("Enter name of new vector map:")),
                      proportion = 0, flag = wx.ALL, border = 3)
        self.vectorNameCtrl = Select(parent = self.panel, type = 'raster',
                                     mapsets = [grass.gisenv()['MAPSET']],
                                     size = globalvar.DIALOG_GSELECT_SIZE)
        if self.rasterName:
            self.vectorNameCtrl.SetValue(self.rasterName)
        dataSizer.Add(item = self.vectorNameCtrl,
                      proportion = 0, flag = wx.ALL | wx.EXPAND, border = 3)
        
                      
        # buttons
        btnSizer = wx.StdDialogButtonSizer()
        btnSizer.AddButton(self.btnCancel)
        btnSizer.AddButton(self.btnOK)
        btnSizer.Realize()
        
        sizer.Add(item = dataSizer, proportion = 1,
                       flag = wx.EXPAND | wx.ALL | wx.ALIGN_CENTER, border = 5)
        
        sizer.Add(item = btnSizer, proportion = 0,
                       flag = wx.EXPAND | wx.ALL | wx.ALIGN_CENTER, border = 5)
        
        self.panel.SetSizer(sizer)
        sizer.Fit(self)
        
        self.SetMinSize(self.GetSize())
        
    def GetRasterName(self):
        """Returns vector name"""
        return self.vectorNameCtrl.GetValue()

    def OnOK(self, event):
        """Checks if map exists and can be overwritten."""
        overwrite = UserSettings.Get(group = 'cmd', key = 'overwrite', subkey = 'enabled')
        rast_name = self.GetRasterName()
        res = grass.find_file(rast_name, element = 'cell')
        if res['fullname'] and overwrite is False:
            qdlg = wx.MessageDialog(parent = self,
                                        message = _("Raster map <%s> already exists."
                                                    " Do you want to overwrite it?" % rast_name) ,
                                        caption = _("Raster <%s> exists" % rast_name),
                                        style = wx.YES_NO | wx.NO_DEFAULT | wx.ICON_QUESTION | wx.CENTRE)
            if qdlg.ShowModal() == wx.ID_YES:
                event.Skip()
            qdlg.Destroy()
        else:
            event.Skip()

class SettingsDialog(wx.Dialog):
    def __init__(self, parent, id, title, scatt_mgr, pos=wx.DefaultPosition, size=wx.DefaultSize,
                 style=wx.DEFAULT_DIALOG_STYLE):
        """Settings dialog"""
        wx.Dialog.__init__(self, parent, id, title, pos, size, style)

        self.scatt_mgr = scatt_mgr

        maxValue = 1e8
        self.parent = parent
        self.settings = {}

        settsLabels = {} 

        self.settings["show_ellips"] = wx.CheckBox(parent = self, id=wx.ID_ANY,
                                                   label = _('Show confidence ellipses'))
        show_ellips = UserSettings.Get(group ='scatt', key = "ellipses", subkey = "show_ellips")
        self.settings["show_ellips"].SetValue(show_ellips)


        self.colorsSetts = {
                            "sel_pol" : ["selection", _("Selection polygon color:")],
                            "sel_pol_vertex" : ["selection", _("Color of selection polygon vertex:")], 
                            "sel_area" : ["selection", _("Selected area color:")]
                           }

        for settKey, sett in self.colorsSetts.iteritems():
            settsLabels[settKey] = wx.StaticText(parent = self, id = wx.ID_ANY, label = sett[1])
            col = UserSettings.Get(group ='scatt', key = sett[0], subkey = settKey)
            self.settings[settKey] = csel.ColourSelect(parent = self, id = wx.ID_ANY,
                                            colour = wx.Colour(col[0],
                                                               col[1],
                                                               col[2], 
                                                               255))

        self.sizeSetts = {
                          "snap_tresh" : ["selection", _("Snapping treshold in pixels:")],
                          "sel_area_opacty" : ["selection", _("Selected area opacity:")]
                         }

        for settKey, sett in self.sizeSetts.iteritems():
            settsLabels[settKey] = wx.StaticText(parent = self, id = wx.ID_ANY, label = sett[1])
            self.settings[settKey] = wx.SpinCtrl(parent = self, id = wx.ID_ANY, min=0, max = 100)
            size = int(UserSettings.Get(group = 'scatt', key = sett[0], subkey = settKey))
            self.settings[settKey].SetValue(size)


        # buttons
        self.btnSave = wx.Button(self, wx.ID_SAVE)
        self.btnApply = wx.Button(self, wx.ID_APPLY)
        self.btnClose = wx.Button(self, wx.ID_CLOSE)
        self.btnApply.SetDefault()

        # bindings
        self.btnApply.Bind(wx.EVT_BUTTON, self.OnApply)
        self.btnApply.SetToolTipString(_("Apply changes for the current session"))
        self.btnSave.Bind(wx.EVT_BUTTON, self.OnSave)
        self.btnSave.SetToolTipString(_("Apply and save changes to user settings file (default for next sessions)"))
        self.btnClose.Bind(wx.EVT_BUTTON, self.OnClose)
        self.btnClose.SetToolTipString(_("Close dialog"))

        #Layout

        # Analysis result style layout
        self.SetMinSize(self.GetBestSize())

        sizer = wx.BoxSizer(wx.VERTICAL)

        sel_pol_box = wx.StaticBox(parent = self, id = wx.ID_ANY,
                                   label =" %s " % _("Selection style:"))
        selPolBoxSizer = wx.StaticBoxSizer(sel_pol_box, wx.VERTICAL)

        gridSizer = wx.GridBagSizer(vgap = 1, hgap = 1)

        row = 0
        setts = dict(self.colorsSetts.items() + self.sizeSetts.items())

        settsOrder = ["sel_pol", "sel_pol_vertex", "sel_area",
                      "sel_area_opacty", "snap_tresh"]
        for settKey in settsOrder:
            sett = setts[settKey]
            gridSizer.Add(item = settsLabels[settKey], flag = wx.ALIGN_CENTER_VERTICAL, pos =(row, 0))
            gridSizer.Add(item = self.settings[settKey],
                          flag = wx.ALIGN_RIGHT | wx.ALL, border = 5,
                          pos =(row, 1))  
            row += 1

        gridSizer.AddGrowableCol(1)
        selPolBoxSizer.Add(item = gridSizer, flag = wx.EXPAND)

        ell_box = wx.StaticBox(parent = self, id = wx.ID_ANY,
                               label =" %s " % _("Ellipses settings:"))
        ellPolBoxSizer = wx.StaticBoxSizer(ell_box, wx.VERTICAL)
        gridSizer = wx.GridBagSizer(vgap = 1, hgap = 1)

        sett = setts[settKey]

        row = 0
        gridSizer.Add(item=self.settings["show_ellips"], 
                      flag=wx.ALIGN_CENTER_VERTICAL, 
                      pos=(row, 0))

        gridSizer.AddGrowableCol(1)
        ellPolBoxSizer.Add(item=gridSizer, flag=wx.EXPAND)

        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(self.btnApply, flag=wx.LEFT | wx.RIGHT, border=5)
        btnSizer.Add(self.btnSave, flag=wx.LEFT | wx.RIGHT, border=5)
        btnSizer.Add(self.btnClose, flag=wx.LEFT | wx.RIGHT, border=5)

        sizer.Add(item=selPolBoxSizer, flag=wx.EXPAND | wx.ALL, border=5)
        sizer.Add(item=ellPolBoxSizer, flag=wx.EXPAND | wx.ALL, border=5)
        sizer.Add(item=btnSizer, flag=wx.EXPAND | wx.ALL, border=5, proportion=0)    

        self.SetSizer(sizer)
        sizer.Fit(self)
     
    def OnSave(self, event):
        """Button 'Save' pressed"""
        self.UpdateSettings()

        fileSettings = {}
        UserSettings.ReadSettingsFile(settings=fileSettings)
        fileSettings['scatt'] = UserSettings.Get(group='scatt')
        UserSettings.SaveToFile(fileSettings)

        self.Close()

    def UpdateSettings(self):

        chanaged_setts = [];
        for settKey, sett in self.colorsSetts.iteritems():
            col = tuple(self.settings[settKey].GetColour())
            col_s = UserSettings.Get(group='scatt', key=sett[0], subkey=settKey)
            if col_s != col:
                UserSettings.Set(group='scatt', 
                                 key=sett[0], 
                                 subkey=settKey,
                                 value=col)
                chanaged_setts.append([settKey, sett[0]])

        for settKey, sett in self.sizeSetts.iteritems():
            val = self.settings[settKey].GetValue()
            val_s = UserSettings.Get(group ='scatt', key = sett[0], subkey = settKey)

            if val_s != val:
                UserSettings.Set(group = 'scatt', key = sett[0], subkey = settKey, 
                                 value = val)
                chanaged_setts.append([settKey, sett[0]])

        val = self.settings['show_ellips'].IsChecked()
        val_s = UserSettings.Get(group ='scatt', key='ellipses', subkey='show_ellips')

        if val != val_s:
            UserSettings.Set(group='scatt', key='ellipses', subkey='show_ellips', 
                             value=val)
            chanaged_setts.append(['ellipses', 'show_ellips'])

        if chanaged_setts: 
            self.scatt_mgr.SettingsUpdated(chanaged_setts)

    def OnApply(self, event):
        """Button 'Apply' pressed"""
        self.UpdateSettings()
        #self.Close()

    def OnClose(self, event):
        """Button 'Cancel' pressed"""
        self.Close()

class ManageBusyCursorMixin:
    def __init__(self, window):
        self.win = window

        self.is_busy = False
        self.cur_inside = False

        self.win.Bind(wx.EVT_ENTER_WINDOW, self.OnEnter)
        self.win.Bind(wx.EVT_LEAVE_WINDOW, self.OnLeave)

    def OnLeave(self, event):   
        self.cur_inside = False     
        self.busy_cur = None

    def OnEnter(self, event):
        self.cur_inside = True
        if self.is_busy:
            self.busy_cur = wx.BusyCursor()

    def UpdateCur(self, busy):
        self.is_busy = busy
        if self.cur_inside and self.is_busy:
            self.busy_cur = wx.BusyCursor()
            return

        self.busy_cur = None

class RenameClassDialog(SimpleDialog):
    def __init__(self, parent, old_name, title=("Change class name")):
        SimpleDialog.__init__(self, parent, title)

        self.name = wx.TextCtrl(self.panel, id = wx.ID_ANY) 
        self.name.SetValue(old_name)

        self.dataSizer.Add(self.name, proportion = 0,
                           flag = wx.EXPAND | wx.ALL, border = 1)

        self.panel.SetSizer(self.sizer)
        self.name.SetMinSize((200, -1))
        self.sizer.Fit(self)

    def GetNewName(self):
        return self.name.GetValue()