#!/usr/bin/env python3

import os
import socket
import io
import time

from flask import Flask

app = Flask( __name__ )

# ---------------------------------------------------------------------

@app.route( "/" )
def home():

    # get our IP address
    try:
        with socket.socket( socket.AF_INET, socket.SOCK_DGRAM ) as sock:
            sock.connect( ( "10.255.255.255", 1 ) )
            ip_address = sock.getsockname()[ 0 ]
    except Exception as ex:
        ip_address = str( ex )

    # get the message of the day
    fname = os.environ.get( "MOTD" )
    if not fname:
        motd = "Embrace the void, there is no message of the day."
    elif not os.path.isfile( fname ):
        motd = "Can't find the MOTD file: {}".format( fname )
    else:
        with open( fname, "r", encoding="utf-8" ) as fp:
            motd = fp.read()

    # generate the response
    buf = io.StringIO()
    print( "Current time: {}".format( time.strftime( "%c" ) ), file=buf )
    print( "<br>", file=buf )
    print( "IP address: {}".format( ip_address ), file=buf )
    print( "<p> Message of the day:", file=buf )
    print( "<pre style='margin:0 0 0 2em;'> {} </pre>".format( motd ), file=buf )
    return buf.getvalue()

# ---------------------------------------------------------------------

# run the Flask webapp
app.run( host="0.0.0.0" )