import string
from datetime import datetime

from kivy.app import App
from kivy.lang import Builder
from kivy.core.window import Window
from kivy.effects.scroll import ScrollEffect
from kivy.uix.screenmanager import Screen, ScreenManager, NoTransition
from kivy.uix.label import Label
from kivy.uix.widget import Widget
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.scrollview import ScrollView
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.boxlayout import BoxLayout

global msg_stack, pr_msg_y

msg_stack = []
pr_msg_y = 0

Builder.load_string('''
<ScrollView>:
    canvas:
        Color:
            rgba: (1, 1, 1, 1)
        Rectangle:
            pos: self.pos
            size: self.size

<Message>:
    FloatLayout:
        canvas:
            Color:
                rgba: 0, 0, 0, 1
            RoundedRectangle:
            Color:
                rgba: 1, 1, 1, 1
            RoundedRectangle:
                pos: self.x + 1, self.y + 1
                size: self.width - 2, self.height - 2

        Button:
            background_normal: ''
            background_down: ''
            background_color: 0, 0, 0, 0
            on_press: root.test()
            TextInput:
                id: msg
                font_name: "E:\Games\Python 3.4\OpenSans\Arev.ttf"
                background_color: 0, 0, 0, 0
                readonly: True
                text: str(msg)
                cursor_color: 0, 0, 0, 0

        Label:
            id: time
            size: 30, self.height
            background_color: 0, 0, 0, 1
''')

class Message(Widget):
    def __init__(self, **kwargs):
        super(Message, self).__init__(**kwargs)
        print("Message created")

    def test(self, *args, **kwargs):
        print("Touch received")

class Chat(Screen):
    pass

class ChatApp(App):
    def build(self):
        def msg_in(*args, **kwargs):
            global pr_msg_y, msg_stack
            msg = tx1_main.text.strip("\n ")
            if msg not in string.whitespace:
                msg_stack.append(Message())

                time = datetime.now().strftime("%H:%M")
                msg_stack[-1].ids['time'].text = time

                msg_stack[-1].ids['msg'].text = msg

                print((len(msg_stack[-1].ids['msg']._lines) + 1) * msg_stack[-1].ids['msg'].line_height)
                msg_stack[-1].height = (len(msg_stack[-1].ids['msg']._lines) + 1) * msg_stack[-1].ids['msg'].line_height
                msg_stack[-1].y = sv1_main.height - 5 - pr_msg_y - msg_stack[-1].height
                msg_stack[-1].x = 5

                tx1_main.text = ''

                msg_float.add_widget(msg_stack[-1])
                pr_msg_y += msg_stack[-1].height + 5

        Screens = ScreenManager(transition = NoTransition())
        chat = Chat(name = "main")

        tx1_main = TextInput(size_hint = (0.9, 0.155),
                             pos_hint = {"top":0.177, "center_x":0.465})

        sv1_main = ScrollView(pos_hint = {"top":0.87, "center_x":0.5},
                              size_hint = (0.97, 0.65))

        msg_float = FloatLayout()

        bt1_main = Button(size_hint = (0.061, 0.078),
                          pos_hint = {"top":0.097, "center_x":0.951},
                          text = "Send",
                          on_press = msg_in)

        chat.add_widget(tx1_main)
        chat.add_widget(sv1_main)
        sv1_main.add_widget(msg_float)
        chat.add_widget(bt1_main)

        Screens.add_widget(chat)

        return Screens

if __name__ == "__main__":
    ChatApp().run()