"""
@package gui_core.query

@brief wxGUI query dialog

Classes:
 - query::QueryDialog

(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 Anna Kratochvilova <kratochanna gmail.com>
"""
import os
import wx

from core.utils import _
from core.gcmd import DecodeString
from gui_core.treeview import TreeListView
from core.treemodel import TreeModel, DictNode

from grass.pydispatch.signal import Signal


class QueryDialog(wx.Dialog):

    def __init__(self, parent, data=None):
        wx.Dialog.__init__(self, parent, id=wx.ID_ANY,
                           title=_("Query results"),
                           size=(420, 400),
                           style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER)
        # send query output to console
        self.redirectOutput = Signal('QueryDialog.redirectOutput')

        self.data = data

        self.panel = wx.Panel(self, id=wx.ID_ANY)
        self.mainSizer = wx.BoxSizer(wx.VERTICAL)

        helpText = wx.StaticText(self.panel, wx.ID_ANY, label=_(
            "Right click to copy selected values to clipboard."))
        helpText.SetForegroundColour(
            wx.SystemSettings_GetColour(
                wx.SYS_COLOUR_GRAYTEXT))
        self.mainSizer.Add(item=helpText, proportion=0, flag=wx.ALL, border=5)

        self._colNames = [_("Feature"), _("Value")]
        self._model = QueryTreeBuilder(self.data, column=self._colNames[1])
        self.tree = TreeListView(model=self._model, parent=self.panel,
                                 columns=self._colNames,
                                 style=wx.TR_DEFAULT_STYLE |
                                 wx.TR_FULL_ROW_HIGHLIGHT | wx.TR_MULTIPLE)

        self.tree.SetColumnWidth(0, 220)
        self.tree.SetColumnWidth(1, 1000)
        self.tree.ExpandAll(self._model.root)
        self.tree.contextMenu.connect(self.ShowContextMenu)
        self.mainSizer.Add(
            item=self.tree,
            proportion=1,
            flag=wx.EXPAND | wx.ALL,
            border=5)

        close = wx.Button(self.panel, id=wx.ID_CLOSE)
        close.Bind(wx.EVT_BUTTON, lambda event: self.Close())
        copy = wx.Button(
            self.panel,
            id=wx.ID_ANY,
            label=_("Copy all to clipboard"))
        copy.Bind(wx.EVT_BUTTON, self.Copy)
        self.Bind(wx.EVT_CLOSE, self.OnClose)
        self.redirect = wx.CheckBox(self.panel, label=_("Redirect to console"))
        self.redirect.SetValue(False)
        self.redirect.Bind(
            wx.EVT_CHECKBOX,
            lambda evt: self._onRedirect(
                evt.IsChecked()))

        hbox = wx.BoxSizer(wx.HORIZONTAL)
        hbox.Add(
            item=self.redirect,
            proportion=0,
            flag=wx.EXPAND | wx.RIGHT,
            border=5)
        hbox.AddStretchSpacer(1)
        hbox.Add(item=copy, proportion=0, flag=wx.EXPAND | wx.RIGHT, border=5)
        hbox.Add(item=close, proportion=0, flag=wx.EXPAND | wx.ALL, border=0)

        self.mainSizer.Add(
            item=hbox,
            proportion=0,
            flag=wx.EXPAND | wx.ALL,
            border=5)
        self.panel.SetSizer(self.mainSizer)
        self.mainSizer.Fit(self.panel)
        # for Windows
        self.SendSizeEvent()

    def SetData(self, data):
        state = self.tree.GetExpansionState()
        self.data = data
        self._model = QueryTreeBuilder(self.data, column=self._colNames[1])
        self.tree.SetModel(self._model)
        self.tree.SetExpansionState(state)

        if self.redirect.IsChecked():
            self.redirectOutput.emit(output=self._textToRedirect())

    def Copy(self, event):
        text = printResults(self._model, self._colNames[1])
        self._copyText(text)

    def ShowContextMenu(self, node):
        """Show context menu.

        Menu for copying distinguishes single and multiple selection.
        """
        nodes = self.tree.GetSelected()
        if not nodes:
            return

        menu = wx.Menu()
        texts = []
        if len(nodes) > 1:
            values = []
            for node in nodes:
                values.append(
                    (node.label, node.data[
                        self._colNames[1]] if node.data else ''))
            col1 = '\n'.join([val[1] for val in values if val[1]])
            col2 = '\n'.join([val[0] for val in values if val[0]])
            table = '\n'.join([val[0] + ': ' + val[1] for val in values])
            texts.append(
                (_("Copy from '%s' column") %
                 self._colNames[1], col1))
            texts.append(
                (_("Copy from '%s' column") %
                 self._colNames[0], col2))
            texts.append((_("Copy selected lines"), table))
        else:
            label1 = nodes[0].label
            texts.append((_("Copy '%s'" % self._cutLabel(label1)), label1))
            if nodes[0].data and nodes[0].data[self._colNames[1]]:
                label2 = nodes[0].data[self._colNames[1]]
                texts.insert(
                    0, (_(
                        "Copy '%s'" %
                        self._cutLabel(label2)), label2))
                texts.append((_("Copy line"), label1 + ': ' + label2))

        ids = []
        for text in texts:
            id = wx.NewId()
            ids.append(id)
            self.Bind(
                wx.EVT_MENU,
                lambda evt,
                t=text[1],
                id=id: self._copyText(t),
                id=id)

            menu.Append(id, text[0])

        # show the popup menu
        self.PopupMenu(menu)
        menu.Destroy()
        for id in ids:
            self.Unbind(wx.EVT_MENU, id=id)

    def _onRedirect(self, redirect):
        """Emits instructions to redirect query results.

        :param redirect: True to start redirecting, False to stop
        """
        if redirect:
            self.redirectOutput.emit(output=_("Query results:"), style='cmd')
            self.redirectOutput.emit(output=self._textToRedirect())
        else:
            self.redirectOutput.emit(output=_(" "), style='cmd')

    def _textToRedirect(self):
        text = printResults(self._model, self._colNames[1])
        text += '\n' + "-" * 50 + '\n'
        return text

    def _cutLabel(self, label):
        limit = 15
        if len(label) > limit:
            return label[:limit] + '...'

        return label

    def _copyText(self, text):
        """Helper function for copying"""
        if wx.TheClipboard.Open():
            do = wx.TextDataObject()
            do.SetText(text)
            wx.TheClipboard.SetData(do)
            wx.TheClipboard.Close()

    def OnClose(self, event):
        if self.redirect.IsChecked():
            self._onRedirect(False)
        self.Destroy()
        event.Skip()


def QueryTreeBuilder(data, column):
    """Builds tree model from query results.
    Convert to unicode.

    :param data: query results as a dictionary
    :param column: column name

    :return: tree model
    """
    def addNode(parent, data, model):
        for k, v in data.iteritems():
            if isinstance(v, str):
                k = DecodeString(k)
            if isinstance(v, dict):
                node = model.AppendNode(parent=parent, label=k)
                addNode(parent=node, data=v, model=model)
            else:
                if not isinstance(v, basestring):
                    v = str(v)
                elif isinstance(v, str):
                    v = DecodeString(v)
                node = model.AppendNode(parent=parent, label=k,
                                        data={column: v})

    model = TreeModel(DictNode)
    for part in data:
        addNode(parent=model.root, data=part, model=model)

    return model


def printResults(model, valueCol):
    """Print all results to string.

    :param model: results tree model
    :param valueCol: column name with value to be printed
    """
    def printTree(node, textList, valueCol, indent=0):
        if node.data.get(valueCol, '') or node.children:
            textList.append(
                indent * ' ' + node.label + ': ' + node.data.get(valueCol, ''))
        for child in node.children:
            printTree(
                node=child,
                textList=textList,
                valueCol=valueCol,
                indent=indent + 2)

    textList = []
    for child in model.root.children:
        printTree(node=child, textList=textList, valueCol=valueCol)
    return '\n'.join(textList)


def PrepareQueryResults(coordinates, result):
    """Prepare query results as a Query dialog input.

    Adds coordinates, improves vector results tree structure.
    """
    data = []
    data.append({_("east, north"): ", ".join(map(str, coordinates))})
    for part in result:
        if 'Map' in part:
            itemText = part['Map']
            if 'Mapset' in part:
                itemText += '@' + part['Mapset']
                del part['Mapset']
            del part['Map']
            if part:
                data.append({itemText: part})
            else:
                data.append({itemText: _("Nothing found")})
        else:
            data.append(part)
    return data


def test():
    app = wx.App()
    from grass.script import vector as gvect
    from grass.script import raster as grast
    testdata1 = grast.raster_what(
        map=('elevation_shade@PERMANENT', 'landclass96'),
        coord=[(638509.051416, 224742.348346)],
        localized=True)

    testdata2 = gvect.vector_what(
        map=(
            'firestations', 'bridges'), coord=(
            633177.897487, 221352.921257), distance=10)

    testdata = testdata1 + testdata2
    data = PrepareQueryResults(
        coordinates=(
            638509.051416,
            224742.348346),
        result=testdata)
    frame = QueryDialog(parent=None, data=data)
    frame.ShowModal()
    frame.Destroy()
    app.MainLoop()

if __name__ == "__main__":
    test()
