#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
Primitivus: a SAT frontend
Copyright (C) 2009, 2010  Jérôme Poisson (goffi@goffi.org)

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""

import urwid
import custom_widgets
from xml.dom import minidom

class Pairs(urwid.WidgetWrap):

    def __init__(self, weight_0='1', weight_1='1'):
        self.idx = 0
        self.weight_0 = weight_0
        self.weight_1 = weight_1
        columns = urwid.Columns([urwid.Text(''), urwid.Text('')])
        #XXX: empty Text hack needed because Pile doesn't support empty list
        urwid.WidgetWrap.__init__(self,columns)

    def append(self, widget):
        pile = self._w.widget_list[self.idx]
        if pile.__class__ == urwid.Text:
            self._w.widget_list[self.idx] = urwid.Pile([widget])
        else:
            pile.widget_list.append(widget)
            pile.item_types.append(('weight',getattr(self,'weight_'+str(self.idx))))
        self.idx = (self.idx + 1) % 2
        

class XMLUI(urwid.WidgetWrap):
    
    def __init__(self, host, xml_data, title = None, options = [], misc={}):
        self.host = host
        self.title = title
        self.options = options
        self.misc = misc
        self.ctrl_list = {}  # usefull to access ctrl
        widget = self.constructUI(xml_data)
        urwid.WidgetWrap.__init__(self,widget)

    def __parseElems(self, node, parent):
        """Parse elements inside a <layout> tags, and add them to the parent"""
        for elem in node.childNodes:
            if elem.nodeName != "elem":
                message=_("Unmanaged tag")
                error(message)
                raise Exception(message)
            id = elem.getAttribute("id")
            name = elem.getAttribute("name")
            type = elem.getAttribute("type")
            value = elem.getAttribute("value") if elem.hasAttribute('value') else u''
            if type=="empty":
                ctrl = urwid.Text('') 
            elif type=="text":
                try:
                    value = elem.childNodes[0].wholeText
                except KeyError:
                    warning (_("text node has no child !"))
                ctrl = urwid.Text(value)
            elif type=="label":
                ctrl = urwid.Text(value+": ")
            elif type=="string":
                ctrl = urwid.Edit(edit_text = value)
                self.ctrl_list[name] = ({'type':type, 'control':ctrl})
            elif type=="password":
                ctrl = custom_widgets.Password(edit_text = value)
                self.ctrl_list[name] = ({'type':type, 'control':ctrl})
            elif type=="textbox":
                ctrl = urwid.Edit(edit_text = value, multiline=True)
                self.ctrl_list[name] = ({'type':type, 'control':ctrl})
            elif type=="list":
                style=[] if elem.getAttribute("multi")=='yes' else ['single']
                ctrl = custom_widgets.List(options=[option.getAttribute("value") for option in elem.getElementsByTagName("option")], style=style)
                self.ctrl_list[name] = ({'type':type, 'control':ctrl})
            elif type=="button":
                callback_id = elem.getAttribute("callback_id")
                ctrl = urwid.Button(value, on_press=self.onButtonPress)
                ctrl.param_id = (callback_id,[field.getAttribute('name') for field in elem.getElementsByTagName("field_back")])
            else:
                error(_("FIXME FIXME FIXME: type [%s] is not implemented") % type)  #FIXME !
                raise NotImplementedError
            parent.append(ctrl)

    def __parseChilds(self, current, elem, wanted = ['layout']):
        """Recursively parse childNodes of an elemen
        @param current: widget container with 'append' method
        @param elem: element from which childs will be parsed
        @param wanted: list of tag names that can be present in the childs to be SàT XMLUI compliant"""
        for node in elem.childNodes:
            if wanted and not node.nodeName in wanted:
                raise Exception("Invalid XMLUI") #TODO: make a custom exception
            if node.nodeName == "layout":
                type = node.getAttribute('type')
                if type == "tabs":
                    raise NotImplementedError
                    self.__parseChilds(current, None, node, ['category'])
                else:
                    if type == "vertical":
                        pass
                    elif type == "pairs":
                        pairs = Pairs()
                        current.append(pairs)
                        current = pairs
                    else:
                        warning(_("Unknown layout, using default one"))
                    self.__parseElems(node, current)
            elif node.nodeName == "category":
                raise NotImplementedError
                """name = node.getAttribute('name') 
                if not node.nodeName in wanted or not name or not isinstance(parent,wx.Notebook):
                    raise Exception("Invalid XMLUI") #TODO: make a custom exception
                notebook = parent
                tab_panel = wx.Panel(notebook, -1) 
                tab_panel.sizer = wx.BoxSizer(wx.VERTICAL)
                tab_panel.SetSizer(tab_panel.sizer)
                notebook.AddPage(tab_panel, name)
                self.__parseChilds(tab_panel, None, node, ['layout'])"""

            else:
                message=_("Unknown tag")
                error(message)
                raise Exception(message) #TODO: raise a custom exception here

    def constructUI(self, xml_data):
        
        list_box = urwid.ListBox(urwid.SimpleListWalker([]))
        
        cat_dom = minidom.parseString(xml_data.encode('utf-8'))
        top= cat_dom.documentElement
        self.type = top.getAttribute("type")
        if not self.title:
            self.title = top.getAttribute("title") #TODO: manage title
        if top.nodeName != "sat_xmlui" or not self.type in ['form', 'param', 'window']:
            raise Exception("Invalid XMLUI") #TODO: make a custom exception

        self.__parseChilds(list_box.body, cat_dom.documentElement)
        
        if self.type == 'form':
            buttons = []
            buttons.append(urwid.Button(_('Submit'),self.onFormSubmitted))
            if not 'NO_CANCEL' in self.options:
                buttons.append(urwid.Button(_('Cancel'),self.onFormCancelled))
            max_len = max([len(button.get_label()) for button in buttons])
            grid_wid = urwid.GridFlow(buttons,max_len+4,1,0,'center')
            list_box.body.append(grid_wid)
        
        
        return list_box

    def show(self):
        """Show the constructed UI"""
        decorated = custom_widgets.LabelLine(self, custom_widgets.SurroundedText(self.title or '')) 
        self.host.showPopUp(decorated)
        self.host.redraw()


    ##EVENTS##

    def onButtonPress(self, button):
        self.host.debug()

    def onFormSubmitted(self, button):
        data = []
        for ctrl_name in self.ctrl_list:
            ctrl = self.ctrl_list[ctrl_name]
            if isinstance(ctrl['control'], custom_widgets.List):
                data.append((ctrl_name, ctrl['control'].getSelectedValue()))
            else:
                data.append((ctrl_name, ctrl['control'].get_edit_text()))
        if self.misc.has_key('action_back'): #FIXME FIXME FIXME: WTF ! Must be cleaned
            raise NotImplementedError
            self.host.debug()
        elif self.misc.has_key('callback'):
            self.misc['callback'](data)
        else:
            warning (_("The form data is not sent back, the type is not managed properly"))
        self.host.removePopUp()
    
    def onFormCancelled(self, button):
        self.host.removePopUp()