"""
@package core.menutree

@brief Creates tree structure for wxGUI menus (former menudata.py)

Classes:
 - menutree::MenuTreeModelBuilder

Usage:
@code
python menutree.py [action] [menu]
@endcode

where <i>action</i>:
 - strings (default, used for translations)
 - tree (simple tree structure)
 - commands (command names and their place in tree)
 - dump (tree structure with stored data)

and <i>menu</i>:
 - manager (Main menu in Layer Manager)
 - module_tree (Module tree in Layer Manager)
 - modeler (Graphical Modeler)
 - psmap (Cartographic Composer)

(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 Glynn Clements (menudata.py)
@author Martin Landa <landa.martin gmail.com> (menudata.py)
@author Anna Petrasova <kratochanna gmail.com>
"""

from __future__ import print_function

import os
import sys
import copy
try:
    import xml.etree.ElementTree as etree
except ImportError:
    import elementtree.ElementTree as etree  # Python <= 2.4

import wx

from core.treemodel import TreeModel, ModuleNode
from core.settings import UserSettings
from core.toolboxes import expandAddons as expAddons
from core.toolboxes import getMessages as getToolboxMessages
from core.toolboxes import clearMessages as clearToolboxMessages
from core.gcmd import GError

if not os.getenv("GISBASE"):
    sys.exit("GRASS is not running. Exiting...")


# TODO: change the system to remove strange derived classes
class MenuTreeModelBuilder:
    """Abstract menu data class"""

    # TODO: message_handler=GError is just for backwards compatibility
    # message_handler=GError should be replaced by None
    def __init__(self, filename, expandAddons=True, message_handler=GError):

        self.menustyle = UserSettings.Get(group='appearance',
                                          key='menustyle',
                                          subkey='selection')

        xmlTree = etree.parse(filename)
        if expandAddons:
            expAddons(xmlTree)
            for message in getToolboxMessages():
                message_handler(message)
            clearToolboxMessages()

        self.model = TreeModel(ModuleNode)
        self._createModel(xmlTree)

    def _createModel(self, xmlTree):
        root = xmlTree.getroot()
        menubar = root.findall('menubar')[0]
        menus = menubar.findall('menu')
        for m in menus:
            self._createMenu(m, self.model.root)

    def _createMenu(self, menu, node):
        label = _(menu.find('label').text)
        items = menu.find('items')
        node = self.model.AppendNode(parent=node, label=label)
        for item in items:
            self._createItem(item, node)

    def _createItem(self, item, node):
        if item.tag == 'separator':
            data = dict(label='', description='', handler='',
                        command='', keywords='', shortcut='', wxId='', icon='')
            self.model.AppendNode(parent=node, label='', data=data)
        elif item.tag == 'menuitem':
            origLabel = _(item.find('label').text)
            handler = item.find('handler').text
            desc = item.find('help')  # optional
            gcmd = item.find('command')  # optional
            keywords = item.find('keywords')  # optional
            shortcut = item.find('shortcut')  # optional
            wxId = item.find('id')       # optional
            icon = item.find('icon')     # optional
            if gcmd is not None:
                gcmd = gcmd.text
            else:
                gcmd = ""
            if desc.text:
                desc = _(desc.text)
            else:
                desc = ""
            if keywords is None or keywords.text is None:
                keywords = ""
            else:
                keywords = keywords.text
            if shortcut is not None:
                shortcut = shortcut.text
            else:
                shortcut = ""
            if wxId is not None:
                wxId = eval('wx.' + wxId.text)
            else:
                wxId = wx.ID_ANY
            if icon is not None:
                icon = icon.text
            else:
                icon = ''
            label = origLabel
            if gcmd:
                if self.menustyle == 1:
                    label += '   [' + gcmd + ']'
                elif self.menustyle == 2:
                    label = '      [' + gcmd + ']'
            data = dict(
                label=origLabel,
                description=desc,
                handler=handler,
                command=gcmd,
                keywords=keywords,
                shortcut=shortcut,
                wxId=wxId,
                icon=icon)
            self.model.AppendNode(parent=node, label=label, data=data)
        elif item.tag == 'menu':
            self._createMenu(item, node)
        else:
            raise ValueError(_("Unknow tag %s") % item.tag)

    def GetModel(self, separators=False):
        """Returns copy of model with or without separators
        (for menu or for search tree).
        """
        if separators:
            return copy.deepcopy(self.model)
        else:
            model = copy.deepcopy(self.model)
            removeSeparators(model)
            return model

    def PrintTree(self, fh):
        for child in self.model.root.children:
            printTree(node=child, fh=fh)

    def PrintStrings(self, fh):
        """Print menu strings to file (used for localization)

        :param fh: file descriptor
        """
        className = str(self.__class__).split('.', 1)[1]
        fh.write('menustrings_%s = [\n' % className)
        for child in self.model.root.children:
            printStrings(child, fh)
        fh.write('    \'\']\n')

    def PrintCommands(self, fh):
        printCommands(self.model.root, fh, itemSep=' | ', menuSep=' > ')


def removeSeparators(model, node=None):
    if not node:
        node = model.root
    if node.label:
        for child in reversed(node.children):
            removeSeparators(model, child)
    else:
        model.RemoveNode(node)


def printTree(node, fh, indent=0):
    if not node.label:
        return
    text = '%s- %s\n' % (' ' * indent, node.label.replace('&', ''))
    fh.write(text)
    for child in node.children:
        printTree(node=child, fh=fh, indent=indent + 2)


def printStrings(node, fh):
    # node.label  - with module in brackets
    # node.data['label'] - without module in brackets
    if node.label and not node.data:
        fh.write('    _(%r),\n' % str(node.label))
    if node.data:
        if 'label' in node.data and node.data['label']:
            fh.write('    _(%r),\n' % str(node.data['label']))
        if 'description' in node.data and node.data['description']:
            fh.write('    _(%r),\n' % str(node.data['description']))
    for child in node.children:
        printStrings(node=child, fh=fh)


def printCommands(node, fh, itemSep, menuSep):

    def collectParents(node, parents):
        parent = node.parent
        if parent.parent:
            parents.insert(0, node.parent)
            collectParents(node.parent, parents)

    data = node.data
    if data and 'command' in data and data['command']:
        fh.write('%s%s' % (data['command'], itemSep))
        parents = [node]
        collectParents(node, parents)
        labels = [parent.label.replace('&', '') for parent in parents]
        fh.write(menuSep.join(labels))
        fh.write('\n')

    for child in node.children:
        printCommands(child, fh, itemSep, menuSep)


if __name__ == "__main__":

    action = 'strings'
    menu = 'manager'

    for arg in sys.argv:
        if arg in ('strings', 'tree', 'commands', 'dump'):
            action = arg
        elif arg in ('manager', 'module_tree', 'modeler', 'psmap'):
            menu = arg

    # FIXME: cross-dependencies
    if menu == 'manager':
        from lmgr.menudata import LayerManagerMenuData
        from core.globalvar import WXGUIDIR
        filename = os.path.join(WXGUIDIR, 'xml', 'menudata.xml')
        menudata = LayerManagerMenuData(filename)
    # FIXME: since module descriptions are used again we have now the third
    # copy of the same string (one is in modules)
    elif menu == 'module_tree':
        from lmgr.menudata import LayerManagerModuleTree
        from core.globalvar import WXGUIDIR
        filename = os.path.join(WXGUIDIR, 'xml', 'module_tree_menudata.xml')
        menudata = LayerManagerModuleTree(filename)
    elif menu == 'modeler':
        from gmodeler.menudata import ModelerMenuData
        menudata = ModelerMenuData()
    elif menu == 'psmap':
        from psmap.menudata import PsMapMenuData
        menudata = PsMapMenuData()
    else:
        import grass.script.core as gscore
        gscore.fatal("Unknown value for parameter menu: " % menu)

    if action == 'strings':
        menudata.PrintStrings(sys.stdout)
    elif action == 'tree':
        menudata.PrintTree(sys.stdout)
    elif action == 'commands':
        menudata.PrintCommands(sys.stdout)
    elif action == 'dump':
        print(menudata.model)
    else:
        import grass.script.core as gscore
        gscore.fatal("Unknown value for parameter action: " % action)

    sys.exit(0)
