# Y1 AUTUMN 2019
# Basic Course in Programming Y1
# Author: Joel Lahenius
# Template for exercise 8.3 Journey Analyzer

from math import pi, cos, sqrt

EARTH_RADIUS = 6371  # km
EARTH_CIRCUMFERENCE = EARTH_RADIUS * 2 * pi  # km
DEGREE_EQUATOR = EARTH_CIRCUMFERENCE / 360  # km


def degrees_to_radians(deg):
    rad = deg * (pi / 180)
    return rad


def calculate_longitude_degree_length(latitude_degrees):
    return cos(degrees_to_radians(latitude_degrees)) * DEGREE_EQUATOR  # km


def calculate_distance(lat1, lon1, lat2, lon2):
    latitude_degree_length = 111.2  # km, roughly constant for our purposes
    longitude_degree_length = calculate_longitude_degree_length((lat1 + lat2) / 2)
    # km, depends on latitude due to Earth being round

    # Write your distance formula here.
    # If you already did it in exercise 7.3 citybike stations,
    # You can use the same formula as there.
    distance = ((latitude_degree_length * (lat1 - lat2)) ** 2 + (longitude_degree_length * (lon1 - lon2)) ** 2) ** (
                1 / 2)

    return distance


def find_distance(line):
    data = line.strip().split(";")
    longitude = data[0]
    latitude = data[1]
    return longitude, latitude


def find_time(line):
    data = line.strip().split(";")
    full_time_stamp = data[3]
    clock_time = full_time_stamp[-9:-1]
    return clock_time


def calculate_time(starting_time, ending_time):
    t0 = starting_time.split(":")
    tn = ending_time.split(":")
    t0 = [int(i) for i in t0]
    tn = [int(i) for i in tn]
    dseconds = tn[2] - t0[2]
    dminutes = tn[1] - t0[1]
    dhours = tn[0] - t0[0]
    hours2minutes = dhours * 60
    seconds2minutes = dseconds / 60
    dt = dminutes + hours2minutes + seconds2minutes
    return round(dt, 1)


def main():
    try:
        filename = input("Journey file name:\n")
        file = open(filename, "r")
        file.readline()
        file.readline()
        file.readline()
        rivi1 = file.readline()
        rivi2 = file.readline()
        start_time = find_time(rivi1)
        while rivi2 != "":



            rivi1 = rivi2
            rivi2 = file.readline()
        file.close()
        end_time = find_time(rivi1)
        time = calculate_time(start_time, end_time)
        print("Your journey took {} minutes.".format(time))
    except FileNotFoundError:
        print("Could not open the file {}, try again.".format(filename))


main()