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

from welcome.board import SmallBoard
from gi.repository import Gtk
import random

try:
    import cairo
    has_cairo = True
    import os
except:
    has_cairo = False


_tip_messages = [
    "Message 1",
    "Message 2",
    "Message 3",
    "Message 4",
    "Message 5",
    "Message 6"
]

assert(len(_tip_messages) > 0)


class TipOfTheDay(SmallBoard):
    """Présente une série d'astuces du jour."""


    def __init__(self):
        """Construit le panneau avec son contenu."""

        super(TipOfTheDay, self).__init__()

        box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
        self.add(box)

        # Barre de contrôle

        toolbar = Gtk.Box(spacing=10)
        toolbar.props.margin = 20
        box.pack_end(toolbar, False, True, 0)

        btn = Gtk.Button('Previous')
        btn.connect('clicked', self.show_previous_message)
        toolbar.pack_start(btn, False, True, 8)

        btn = Gtk.Button('Next')
        btn.connect('clicked', self.show_next_message)
        toolbar.pack_start(btn, False, True, 8)

        # Contenu de l'astuce courante

        desc = Gtk.Label('', use_markup=True, wrap=True, xalign=0)
        self._message = desc
        desc.set_justify(Gtk.Justification.LEFT)
        box.pack_end(desc, False, True, 0)

        # Titre

        desc = Gtk.Label("<b>Did you know?</b>", use_markup=True, wrap=True, xalign=0)
        desc.set_justify(Gtk.Justification.LEFT)
        box.pack_end(desc, False, True, 0)

        # Image de fond, si possible

        if has_cairo:

            os.chdir(os.path.dirname(__file__))

            self._img = cairo.ImageSurface.create_from_png('tipoftheday.png')

            self.connect_after('draw', self.draw_background)

        # Sélection du message courant

        self._indexes = [i for i in range(len(_tip_messages))]
        random.shuffle(self._indexes)

        self._index = 0

        self.show_message()


    def draw_background(self, widget, cr):
        """Dessine une image de fond pour les conseils."""

        img_width = self._img.get_width()
        img_height = self._img.get_height()

        alloc = self.get_allocation()
        target_height = alloc.height * 0.7

        if img_height > target_height:

            scale = float(target_height) / float(img_height)

            cr.translate(alloc.width - img_width * scale - 10, 10)
            cr.scale(scale, scale)

        else:

            cr.translate(alloc.width - img_width - 10, 10)

        cr.set_source_surface(self._img)
        cr.paint_with_alpha(0.6)


    def show_message(self):
        """Affiche un conseil du jour donné."""

        selected = self._indexes[self._index]

        msg = _tip_messages[selected]

        self._message.set_markup(msg)


    def show_previous_message(self, button):
        """Affiche un conseil du jour précédent."""

        if self._index == 0:
            self._index = len(_tip_messages) - 1
        else:
            self._index = self._index - 1

        self.show_message()


    def show_next_message(self, button):
        """Affiche un conseil du jour suivant."""

        self._index = self._index + 1

        if self._index == len(_tip_messages):
            self._index = 0

        self.show_message()


    def get_location(self):
        """Fournit la localisation souhaitée pour la plache."""

        return [ 2, 1, 2, 2 ]