# -*- coding: utf-8 -*-
#Copyright (c) 2010, Kirk Winans

# 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.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import gtk
from os import environ
from os.path import join, basename
import hippo

import shutil
import tempfile
from gettext import gettext as _
import logging
from gobject import SIGNAL_RUN_FIRST, TYPE_PYOBJECT
from sugar.graphics import style
from sugar.graphics.toolbutton import ToolButton
from sugar.graphics.icon import Icon
from sugar.graphics.palette import Palette
from port.widgets import ToggleToolButton
from port.widgets import CanvasRoundBox, ToolComboBox
#from port import chooser

from sugar.datastore import datastore
import xml.etree.ElementTree
from datetime import date
import time
_logger = logging.getLogger("test-activity")

_1_DAY = 60 * 60 * 24
_2_DAYS = _1_DAY * 2
_4_DAYS = _2_DAYS * 2
_1_WEEK = _1_DAY * 7
_2_WEEKS = _1_WEEK * 2
_1_MONTH = _2_WEEKS * 2

_REVIEWED = False

#
# Review Panel for the Flashcard Activity
#
class ReviewPanel(gtk.VBox):

    def __init__(self, deckfile, box, catagory, expired_only):
        gtk.VBox.__init__(self)

        self.catagory = catagory
        self.box_number = self.get_box_number(box)
        self.expired_only = expired_only

        self.view_box = gtk.HBox()
        self.entry_box = gtk.HBox()
        self.button_box = gtk.HButtonBox()
        self.answer_box = gtk.HBox()

        self.frontlabel = gtk.Label(_('Front:'))

        self.viewcard = gtk.TextView()
        self.textbuffer = self.viewcard.get_buffer()
        self.viewcard.set_editable(False)
        self.viewcard.set_wrap_mode(gtk.WRAP_WORD)
        self.viewcard.set_justification(gtk.JUSTIFY_CENTER)
        self.viewcard.set_pixels_above_lines(40)

        self.entrylabel = gtk.Label(_('Back:'))

        self.answer_entry = gtk.Entry()
        
        self.answerlabel = gtk.Label(_('The answer was:'))

        self.correct = gtk.TextView()
        self.correcttextbuffer = self.correct.get_buffer()
        self.correct.set_editable(False)
        self.correct.set_wrap_mode(gtk.WRAP_WORD)
        self.correct.set_justification(gtk.JUSTIFY_CENTER)
        self.correct.set_pixels_above_lines(40)

        _checkbutton = ToolButton(tooltip=_('Check Answer!'))
        _checkbutton.connect('clicked', self._check_answer_cb)
        _checkbutton.set_icon_widget(
                self.make_label('next', ' ' + _('Check Answer!')))

        _nextcard = ToolButton(tooltip=_('Next Card'))
        _nextcard.connect('clicked', self._next_card_cb)
        _nextcard.set_icon_widget(
            self.make_label('next', ' ' + _('Next Card')))

        self.view_box.pack_start(self.frontlabel)
        self.view_box.pack_start(self.viewcard)
        
        self.entry_box.pack_start(self.entrylabel)
        self.entry_box.pack_start(self.answer_entry)

        self.button_box.pack_start(_checkbutton)
        self.button_box.pack_start(_nextcard)

        self.answer_box.pack_start(self.answerlabel)
        self.answer_box.pack_start(self.correct)
        

        self.pack_start(self.view_box)
        self.pack_start(self.entry_box)
        self.pack_start(self.answer_box)
        self.pack_start(self.button_box)

        self.frontlabel.show()
        self.viewcard.show()
        
        self.entrylabel.show()
        self.answer_entry.show()

        self.answerlabel.show()
        self.correct.show()

        _checkbutton.show()
        _nextcard.show()

        self.view_box.show()
        self.entry_box.show()
        self.answer_box.show()
        self.button_box.show()

        self.current_date = time.time()

        self.deckfile = deckfile

        self.tree = xml.etree.ElementTree.parse(self.deckfile)

        self.deck = self.get_selected_deck()

        self.current_card_index = 0

        self.card = self.next_card()

        self.card_reviewed = False

        self.textbuffer.set_text(self.card.find("front").text)

    # Returns the box number of the selected box
    def get_box_number(self, box):
        if box == "Every Day":
            return "0"
        elif box == "Every 2 Days":
            return "1"
        elif box == "Every 4 Days":
            return "2"
        elif box == "Every Week":
            return "3"
        elif box == "Every 2 Weeks":
            return "4"
        elif box == "Every Month":
            return "5"
        else:
            return box

        
    # Check answer callback
    def _check_answer_cb(self, button):
        self.correcttextbuffer.set_text(self.check_answer())
        self.card_reviewed = True
        

    def _next_card_cb(self, button):
        if self.card_reviewed:
           self.answer_entry.set_text("") 
           self.card = self.next_card()
           self.textbuffer.set_text(self.card.find("front").text)
           self.correcttextbuffer.set_text("")
           self.card_reviewed = False


    # Checks the answer submitted, returns "Correct" or the back of the card
    def check_answer(self):
        if self.answer_entry.get_text() == self.card.find("back").text:
            if self.expired_only: 
                new_stage = int(self.card.find("stage").text) + 1
                self.update_card(new_stage)
            return "Correct!"

        else:
            if self.expired_only:
                self.update_card(0)
            return self.card.find("back").text

    # Returns the selected deck, based on expiration, 
    # the box, and the category
    def get_selected_deck(self):
        if self.expired_only:
            selected_deck = self.get_all_expired()
        
        else:
            selected_deck = self.tree.getroot()

        selected_deck = self.get_selected_box(selected_deck)

        selected_deck = self.get_selected_catagory(selected_deck)

        return selected_deck
                 

    # Returns all the expired cards
    def get_all_expired(self):
        deck = self.tree.getroot()
        expired_deck = []
        for card in deck:
            if self.card_is_expired(card):
                expired_deck = expired_deck + [card]
        return expired_deck

    # Returns True if the card is expired
    def card_is_expired(self, card):
        card_stage = card.find("stage").text
        card_date = float(card.find("last_reviewed").text)
        date_difference = self.current_date - card_date
        if (card_stage == "0") and (date_difference > _1_DAY):
            return True

        elif (card_stage == "1") and (date_difference > _2_DAYS):
            return True

        elif (card_stage == "2") and (date_difference > _4_DAYS):
            return True

        elif (card_stage == "3") and (date_difference > _1_WEEK):
            return True

        elif (card_stage == "4") and (date_difference > _2_WEEKS):
            return True

        elif (card_stage == "5") and (date_differnce > _1_MONTH):
            return True

        else:
            return False

    # Modifies the deck for the selected box, returns the deck
    def get_selected_box(self, selected_deck):
        if self.box_number != "All":
            selected_box = []
            for card in selected_deck:
                if card.find("stage").text == self.box_number:
                    selected_box = selected_box + [card]
            return selected_box
        else:
            return selected_deck  

    # Modifies the deck for teh selected category, returns the deck
    def get_selected_catagory(self, selected_deck):
        catagory_deck = []
        if self.catagory != "All":
            for card in selected_deck:
                if card.find("catagory").text == self.catagory:
                    catagory_deck = catagory_deck + [card]
            return catagory_deck
        else:
            return selected_deck

    # returns the next card to be reviewed, if there are no more,
    # returns an empty card
    def next_card(self):
        if len(self.deck) > 0 and self.current_card_index < len(self.deck):
            next_card = self.deck[self.current_card_index]

            self.current_card_index += 1

            return next_card

        else:
            return self.gen_empty_card()

            
    # Returns an empty card that states there are no Cards to Review
    def gen_empty_card(self):
        
        empty_card = xml.etree.ElementTree.Element("card")

        e_c_front = xml.etree.ElementTree.Element("front")
        e_c_back = xml.etree.ElementTree.Element("back")
        e_c_last = xml.etree.ElementTree.Element("last_reviewed")
        e_c_stage = xml.etree.ElementTree.Element("stage")
        e_c_catagory = xml.etree.ElementTree.Element("catagory")
    
        e_c_front.text = "No Cards to Review!"
        e_c_back.text = "None"
        e_c_last.text = str(time.time())
        e_c_stage.text = "0"
        e_c_catagory.text = "None"

        empty_card.append(e_c_front)
        empty_card.append(e_c_back)
        empty_card.append(e_c_last)
        empty_card.append(e_c_stage)
        empty_card.append(e_c_catagory)

        return empty_card

    # updates the card after it has been reviewed to reflect
    # the new box and its last reviewed date
    def update_card(self, stage):

        self.card.find("last_reviewed").text = str(time.time())
        self.card.find("stage").text = str(stage)

        self.tree.write(self.deckfile)

    # Gets the icon for the button and makes the label
    # Written by Simon Schampijer
    def make_label(self, icon_name, label):
        label_box = gtk.HBox()
        icon = Icon(
                icon_name=icon_name,
                icon_size=gtk.ICON_SIZE_LARGE_TOOLBAR)
        label_box.pack_start(icon, False)
        label = gtk.Label(label)
        label.modify_fg(gtk.STATE_NORMAL,
                style.COLOR_TOOLBAR_GREY.get_gdk_color())
        label_box.pack_start(label)
        label_box.show_all()
        return label_box