Seekers/Views/MapTimer.xaml.cs

using Justice.Helpers;
using Microsoft.Maui.ApplicationModel.Communication;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace Justice.Views
{
    public partial class MapTimer : ContentPage
    {
        private bool isTrackingActive;

        public MapTimer()
        {
            InitializeComponent();
            FetchLocation();
        }

        private async void StartTrackingClicked(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(DestinationLatitudeEntry.Text) ||
                string.IsNullOrWhiteSpace(DestinationLongitudeEntry.Text))
            {
                await DisplayAlert("Error", "Please enter destination coordinates.", "OK");
                return;
            }

            if (!double.TryParse(DestinationLatitudeEntry.Text, out double destinationLatitude) ||
                !double.TryParse(DestinationLongitudeEntry.Text, out double destinationLongitude))
            {
                await DisplayAlert("Error", "Invalid destination coordinates.", "OK");
                return;
            }

            if (!int.TryParse(TimerEntry.Text, out int timerMinutes))
            {
                await DisplayAlert("Error", "Invalid timer value. Please enter a numeric value.", "OK");
                return;
            }

            isTrackingActive = true;

            // Set timer duration
            var timerDuration = TimeSpan.FromMinutes(timerMinutes);
            var timerEnd = DateTime.Now.Add(timerDuration);
            string phoneNumber = "9860104625";

            // Start countdown display
            _ = UpdateCountdownDisplay(timerEnd);

            while (isTrackingActive && DateTime.Now < timerEnd)
            {
                await Task.Delay(5000); // Check location every 5 seconds

                // Fetch current location
                var (currentLatitude, currentLongitude, _) = await GeolocationHelper.GetLocationAsync();

                // Define tolerance for proximity
                const double Tolerance = 0.0001;

                // Check if user has reached the destination
                if (Math.Abs(destinationLatitude - currentLatitude) < Tolerance &&
                    Math.Abs(destinationLongitude - currentLongitude) < Tolerance)
                {
                    isTrackingActive = false;

                    // Notify user and send SMS
                    string reachedMessage = "User has safely reached the destination.";
                    await DisplayAlert("Success", "Safely reached the destination!", "OK");
                    await SendSmsNotification(phoneNumber, reachedMessage);
                    return;
                }
            }

            // If timer expires and destination is not reached
            if (isTrackingActive)
            {
                string notReachedMessage = "User did not reach the destination within the set time.";
                await DisplayAlert("Time's Up", "You did not reach the destination within the set timer.", "OK");
                await SendSmsNotification(phoneNumber, notReachedMessage);
            }
        }

        private async Task UpdateCountdownDisplay(DateTime timerEnd)
        {
            while (isTrackingActive && DateTime.Now < timerEnd)
            {
                TimeSpan remainingTime = timerEnd - DateTime.Now;

                // Update the UI with remaining time
                TimerLabel.Text = $"Time Remaining: {remainingTime.Minutes:D2}:{remainingTime.Seconds:D2}";

                // Wait for 1 second before updating again
                await Task.Delay(1000);
            }

            // Clear the timer label after countdown ends
            TimerLabel.Text = isTrackingActive ? "Time's Up!" : "You reached the destination!";
        }

        private async void FetchLocation()
        {
            try
            {
                var (latitude, longitude, address) = await GeolocationHelper.GetLocationAsync();
                SourceLatitudeEntry.Text = latitude.ToString();
                SourceLongitudeEntry.Text = longitude.ToString();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error fetching location: {ex.Message}");
                await DisplayAlert("Error", $"Failed to get location: {ex.Message}", "OK");
            }
        }

        private async Task SendSmsNotification(string phoneNumber, string message)
        {
            try
            {
                if (Sms.Default.IsComposeSupported)
                {
                    var smsMessage = new SmsMessage
                    {
                        Body = message,
                        Recipients = new List<string> { phoneNumber }
                    };

                    await Sms.Default.ComposeAsync(smsMessage);
                }
                else
                {
                    await DisplayAlert("Error", "SMS is not supported on this device.", "OK");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error sending SMS: {ex.Message}");
                await DisplayAlert("Error", "Failed to send SMS.", "OK");
            }
        }
    }
}