PipefyProspUpdate/AppState.cs

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;

namespace PipefyProspUpdate
{
    public class AppState
    {
        private static readonly List<Models.Suggestion> suggestions = new();
        public DateTime LastUpdated { get; set; }
        public List<Models.Suggestion>? Suggestions { get; set; } = suggestions;
        public List<Models.Suggestion> MesoChangeBoxItems { get; set; } = new();
        public List<Models.Suggestion> CityChangeBoxItems { get; set; } = new();
        public List<Models.Users> Users { get; set; } = new();
        public List<Models.Users> Prospectante { get; set; } = new();
        public List<Models.Users> Others { get; set; } = new();
        public List<Models.Node> ProspeccaoFilteredCards {  get; set; } = new();
        public List<Models.Node> recentMutations {  get; set; } = new();
        public bool filterFlag { get; set; }
        public int currentItems { get; set; }
        public string? selectedUF { get; set; }
        public bool KeepProsp { get; set; }
        public bool KeepResp { get; set; }
        private static AppState? _instance;
        private static readonly string FilePath = SetPath();

        public static AppState Instance => _instance ??= Load();

        private AppState() {  }

        public static string SetPath()
        {
            return $"{System.IO.Path.GetTempPath()}appstate.json";
        }

        public void Save()
        {
            var json = JsonConvert.SerializeObject(this, Formatting.Indented);
            File.WriteAllText(FilePath, json);
        }

        private static AppState Load()
        {
            if (File.Exists(FilePath))
            {
                var json = File.ReadAllText(FilePath);
                return JsonConvert.DeserializeObject<AppState>(json) ?? new AppState();
            }
            return new AppState();
        }
    }
}