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

namespace Helpers
{
    public class JsonPersistentStore<T>
    {
        private readonly string FileName;
        private readonly SemaphoreSlim Semaphore = new SemaphoreSlim(1, 1);
        public readonly List<T> Items = new List<T>();

        public JsonPersistentStore(string fileName)
        {
            FileName = fileName;
        }

        public void Load()
        {
            if (!File.Exists(FileName)) return;
            var json = File.ReadAllText(FileName);
            try
            {
                Items.AddRange(JsonConvert.DeserializeObject<IEnumerable<T>>(json));
            }
            catch (Exception ex)
            {
                DomainPorts.Logger.Warning($"Failed to load items from file: {FileName}", ex);
            }
        }

        public void Save()
        {
            Semaphore.Wait();
            try
            {
                var json = JsonConvert.SerializeObject(Items);
                File.WriteAllText(FileName, json);
            }
            catch (Exception ex)
            {
                DomainPorts.Logger.Warning($"Failed to save items to file: {FileName}", ex);
            }
            finally
            {
                Semaphore.Release();
            }
        }
    }
}