import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output

from .app import app
from .exam_analysis import app as exam_analysis
from .create_exam import app as create_exam
from .student_analysis import app as student_analysis


app.layout = html.Div(
    [dcc.Location(id="url", refresh=False), html.Div(id="page-content")]
)


@app.callback(Output("page-content", "children"), Input("url", "pathname"))
def display_page(pathname):
    if pathname == "/":
        return exam_analysis.layout
    elif pathname == "/create-exam":
        return create_exam.layout
    elif pathname == "/students":
        return student_analysis.layout
    else:
        return "404"


if __name__ == "__main__":
    app.run_server(debug=True)