Billing/Billing.Shared/Helper.cs

using Billing.Models;
using Billing.UI;
using Billing.Views;
using System;
using System.Globalization;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using Xamarin.Essentials;
using Xamarin.Forms;

namespace Billing
{
    internal static class Helper
    {
#if DEBUG
        public static void Debug(string message)
        {
            var time = DateTime.Now.ToString("HH:mm:ss.fff");
            System.Diagnostics.Debug.WriteLine($"[{time}] - {message}");
        }
#else
#pragma warning disable IDE0060 // Remove unused parameter
        public static void Debug(string message)
        {
        }
#pragma warning restore IDE0060 // Remove unused parameter
#endif

        public static void Error(string category, Exception ex)
        {
            Error(category, ex?.ToString() ?? "unknown error");
        }

        public static void Error(string category, string message)
        {
#if DEBUG
            var time = DateTime.Now.ToString("HH:mm:ss.fff");
            System.Diagnostics.Debug.WriteLine($"[{time}] - {category}", message);
            MainThread.BeginInvokeOnMainThread(async () => await Shell.Current.DisplayAlert(category, message, "Ok"));
#endif

            _ = Store.StoreHelper.SaveLogItemAsync(new Logs()
            {
                LogTime = DateTime.Now,
                Category = category,
                Detail = message
            });
        }

        public static bool NetworkAvailable
        {
            get
            {
                try
                {
                    return Connectivity.NetworkAccess == NetworkAccess.Internet
                        || Connectivity.NetworkAccess == NetworkAccess.ConstrainedInternet;
                }
                catch
                {
                    return false;
                }
            }
        }

        public const string DEFAULT_COLOR = "#183153";

        public static string WrapColorString(string color)
        {
            if (color == null)
            {
                return DEFAULT_COLOR;
            }
            if (color.Length > 7)
            {
                var alpha = color[1..3];
                if (int.TryParse(alpha, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out int a) && a == 255)
                {
                    return "#" + color[3..];
                }
            }
            return color;
        }

        public static UIBill WrapBill(Bill b)
        {
            var category = App.Categories.FirstOrDefault(c => c.Id == b.CategoryId);
            return new UIBill(b)
            {
                Icon = category?.Icon ?? Definition.DefaultIcon,
                TintColor = category?.TintColor ?? Definition.TransparentColor,
                Name = b.Name,
                DateCreation = b.CreateTime,
                Amount = b.Amount,
                Wallet = App.Accounts.FirstOrDefault(a => a.Id == b.WalletId)?.Name
            };
        }

        public static bool IsSameDay(DateTime day1, DateTime day2)
        {
            return day1.Year == day2.Year && day1.DayOfYear == day2.DayOfYear;
        }

        public static DateTime FirstDay(DateTime date)
        {
            var week = date.DayOfWeek;
            if (week == DayOfWeek.Sunday)
            {
                return date;
            }
            return date.AddDays(-(int)week);
        }

        public static BindableProperty Create<TResult, TOwner>(string name, TResult defaultValue = default, PropertyValueChanged<TResult, TOwner> propertyChanged = null)
            where TOwner : BindableObject
        {
            if (propertyChanged == null)
            {
                return BindableProperty.Create(name, typeof(TResult), typeof(TOwner), defaultValue: defaultValue);
            }
            return BindableProperty.Create(name, typeof(TResult), typeof(TOwner),
                defaultValue: defaultValue,
                propertyChanged: (obj, old, @new) =>
                {
                    if (old != null && !(old is TResult))
                    {
                        return;
                    }
                    if (@new != null && !(@new is TResult))
                    {
                        return;
                    }
                    propertyChanged((TOwner)obj, (TResult)old, (TResult)@new);
                });
        }

        public delegate void PropertyValueChanged<TResult, TOwner>(TOwner obj, TResult old, TResult @new);

        public static async Task<PermissionStatus> CheckAndRequestPermissionAsync<T>() where T : Permissions.BasePermission, new()
        {
            var status = await Permissions.CheckStatusAsync<T>();
            if (status != PermissionStatus.Disabled &&
                status != PermissionStatus.Granted)
            {
                status = await Permissions.RequestAsync<T>();
            }
            return status;
        }

        private static double TransformLatitude(double x, double y)
        {
            var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.Sqrt(Math.Abs(x));
            ret += (20.0 * Math.Sin(6.0 * x * Math.PI) + 20.0 * Math.Sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
            ret += (20.0 * Math.Sin(y * Math.PI) + 40.0 * Math.Sin(y / 3.0 * Math.PI)) * 2.0 / 3.0;
            ret += (160.0 * Math.Sin(y / 12.0 * Math.PI) + 320 * Math.Sin(y * Math.PI / 30.0)) * 2.0 / 3.0;
            return ret;
        }

        private static double TransformLongitude(double x, double y)
        {
            var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.Sqrt(Math.Abs(x));
            ret += (20.0 * Math.Sin(6.0 * x * Math.PI) + 20.0 * Math.Sin(2.0 * x * Math.PI)) * 2.0 / 3.0;
            ret += (20.0 * Math.Sin(x * Math.PI) + 40.0 * Math.Sin(x / 3.0 * Math.PI)) * 2.0 / 3.0;
            ret += (150.0 * Math.Sin(x / 12.0 * Math.PI) + 300.0 * Math.Sin(x / 30.0 * Math.PI)) * 2.0 / 3.0;
            return ret;
        }

        public static (double longitude, double latitude) Wgs84ToGcj02(double longitude, double latitude)
        {
            var a = 6378245.0;
            var ee = 0.00669342162296594323;
            var offsetLatitude = TransformLatitude(longitude - 105.0, latitude - 35.0);
            var offsetLongitude = TransformLongitude(longitude - 105.0, latitude - 35.0);
            var radiusLatitude = latitude / 180.0 * Math.PI;
            var magic = Math.Sin(radiusLatitude);
            magic = 1 - ee * magic * magic;
            var sqrtMagic = Math.Sqrt(magic);
            offsetLatitude = offsetLatitude * 180.0 / (a * (1 - ee) / (magic * sqrtMagic) * Math.PI);
            offsetLongitude = offsetLongitude * 180.0 / (a / sqrtMagic * Math.Cos(radiusLatitude) * Math.PI);
            return (longitude + offsetLongitude, latitude + offsetLatitude);
        }
    }

    public class AsyncLazy<T>
    {
        private readonly Lazy<Task<T>> instance;

        public AsyncLazy(Func<Task<T>> factory)
        {
            instance = new Lazy<Task<T>>(() => Task.Run(factory));
        }

        public TaskAwaiter<T> GetAwaiter()
        {
            return instance.Value.GetAwaiter();
        }
    }
}