# Copyright (C) 2009, Tomeu Vizoso
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

import logging

import gobject
import gtk
import cjson

from sugar import dispatch

class MindMapModel(gtk.TreeStore):

    def __init__(self):
        gtk.TreeStore.__init__(self, int, str, long, long, str)

        self._next_thought_id = 0
        self._thoughts_by_id = {}
        self._thoughts = []

    def create_new_thought(self, name='', x=0, y=0, color='', parent_id=None):
        thought_id = self._next_thought_id

        parent = None
        if parent_id is not None:
            parent = self.find_by_id(parent_id).iter

        self.append(parent, (thought_id, name, x, y, color))
        self._next_thought_id += 1
        return thought_id

    def _serialize_thoughts(self, rows):
        thoughts = []
        for row in rows:
            thought_dict = {}
            thoughts.append(thought_dict)

            thought_dict['id'] = row[0]
            thought_dict['name'] = row[1]
            thought_dict['x'] = row[2]
            thought_dict['y'] = row[3]
            thought_dict['color'] = row[4]
            
            children = self._serialize_thoughts(row.iterchildren())
            thought_dict['children'] = children

        return thoughts

    def serialize(self):
        return cjson.encode({'thoughts': self._serialize_thoughts(self)})

    def unserialize(self, data):
        thoughts = cjson.decode(data)['thoughts']
        self._unserialize_thoughts(parent=None, thoughts=thoughts)

    def _unserialize_thoughts(self, parent, thoughts):
        for thought_dict in thoughts:
            self._next_thought_id = max(self._next_thought_id + 1,
                                        thought_dict['id'] + 1)
            new_row = self.append(parent, (thought_dict['id'],
                                           thought_dict.get('name', None),
                                           thought_dict.get('x', None),
                                           thought_dict.get('y', None),
                                           thought_dict.get('color', None)))
            children = thought_dict.get('children', [])
            self._unserialize_thoughts(parent=new_row, thoughts=children)

    def find_by_id(self, thought_id, rows=None):
        if rows is None:
            rows = self
        for row in rows:
            if row[0] == thought_id:
                return row

            children = row.iterchildren()
            found_row = self.find_by_id(thought_id, children)
            if found_row is not None:
                return found_row

        return None