app.py

import requests
import math
import streamlit as st

# Fetch vehicle coordinates from the API
def get_vehicle_coordinates():
    url = "http://103.9.23.45/TrakkerServices/Api/Home/GetSOSLastLocation/SOSUser1/SOSPassword1/03300607077/null"
    response = requests.get(url)
    
    # Check if the response is successful
    if response.status_code == 200:
        data = response.json()
        return data
    else:
        return None

# Haversine formula to calculate distance between two coordinates
def calculate_distance(coord1, coord2):
    lat1, lon1 = coord1
    lat2, lon2 = coord2
    R = 6371  # Radius of the Earth in kilometers
    phi1, phi2 = math.radians(lat1), math.radians(lat2)
    delta_phi = math.radians(lat2 - lat1)
    delta_lambda = math.radians(lon2 - lon1)
    
    a = math.sin(delta_phi / 2)**2 + math.cos(phi1) * math.cos(phi2) * math.sin(delta_lambda / 2)**2
    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
    distance = R * c  # Resulting distance in kilometers
    return distance

# Streamlit UI
st.title("Vehicle Distance Calculator")

# Fetch the vehicle data from the API
vehicle_data = get_vehicle_coordinates()

# Handle the case where data is not available
if vehicle_data is None:
    st.error("Failed to fetch vehicle data.")
else:
    # Assuming vehicle data has 'RegNo', 'latitude', and 'longitude' for each vehicle
    vehicle_regnos = [vehicle['RegNo'] for vehicle in vehicle_data]  # Extract vehicle registration numbers (RegNo)
    
    # Select two vehicles from the list
    selected_vehicle1 = st.selectbox("Select the first vehicle", vehicle_regnos)
    selected_vehicle2 = st.selectbox("Select the second vehicle", vehicle_regnos)

    # Retrieve the selected vehicle's data
    vehicle1 = next(vehicle for vehicle in vehicle_data if vehicle['RegNo'] == selected_vehicle1)
    vehicle2 = next(vehicle for vehicle in vehicle_data if vehicle['RegNo'] == selected_vehicle2)

    # Extract coordinates of the selected vehicles
    coord1 = (vehicle1['latitude'], vehicle1['longitude'])
    coord2 = (vehicle2['latitude'], vehicle2['longitude'])

    # Calculate the distance between the two vehicles
    distance = calculate_distance(coord1, coord2)

    # Display the calculated distance
    st.write(f"The distance between vehicle {selected_vehicle1} and vehicle {selected_vehicle2} is {distance:.2f} km")