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from sympy.matrices import *
from sympy.printing import *
from IPython.display import display, HTML, Math, Latex, clear_output
from ipywidgets import widgets
from random import randint

text1 = widgets.Text()

button1 = widgets.Button(description="Auswerten")
button2 = widgets.Button(description="Neue Aufgabe")

x = Matrix()
y = Matrix()

latexWidget = widgets.Latex()

taskWidget = widgets.HTML()
taskWidget.value = "<b>Berechnen Sie:</b>"

mhbox1 = widgets.HBox((taskWidget, latexWidget))
mhbox2 = widgets.HBox((button1, button2))

def init_vectors(b):
        global x, y, text1
        x = Matrix([randint(-20,20), randint(-20,20), randint(-20,20)])
        y = Matrix([randint(-20,20), randint(-20,20), randint(-20,20)])
        text1.value = ""
        display_task()

def display_task():
        global x, y, latexWidget

        clear_output()

        a1 = latex(x)
        a2 = latex(y)

        a1 = a1.replace("left[", "left(")
        a2 = a2.replace("left[", "left(")
        a1 = a1.replace("right]", "right)")
        a2 = a2.replace("right]", "right)")

        str1 = "$\langle" + a1 + ", " + a2 + "\\rangle$"
        latexWidget.value = str1

def evaluate(b):
        global x, y, text1
        z = x.dot(y)

        clear_output()
        display_task()

        if "{0}".format(z) == text1.value:
                display(HTML("<b><font color='green'>Richtig</font></b>"))
        else:
                display(HTML("<b><font color='red'>Falsch</font></b>"))


def exec_la_scalar():
        init_vectors(button2)
        button2.on_click(init_vectors)
        button1.on_click(evaluate)
        display(widgets.VBox((mhbox1, text1, mhbox2)))