using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using RainOpsMini.Helpers;
using RainOpsMini.Helpers.RCON;
using RainOpsMini.Models;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace RainOpsMini.Services
{
    public class ServerInfoStorageService : BackgroundService
    {
        private readonly ILogger<ServerInfoStorageService> _logger;
        private readonly RconDataCache _cache;
        private readonly TimeSpan _interval = TimeSpan.FromMinutes(10);

        public ServerInfoStorageService(ILogger<ServerInfoStorageService> logger, RconDataCache cache)
        {
            _logger = logger;
            _cache = cache;
        }

        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        {
            _logger.LogInformation("[ServerInfoStorage] Service started. Interval: 10 minutes.");

            // Wait a bit on startup to ensure RCON has connected and fetched first data
            await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);

            while (!stoppingToken.IsCancellationRequested)
            {
                try
                {
                    await RecordServerInfo();
                }
                catch (Exception ex)
                {
                    _logger.LogError(ex, "[ServerInfoStorage] Error recording server info.");
                }

                await Task.Delay(_interval, stoppingToken);
            }
        }

        private async Task RecordServerInfo()
        {
            var data = _cache.GetData();
            if (data?.ServerInfo == null)
            {
                _logger.LogWarning("[ServerInfoStorage] Server info is null, skipping record.");
                return;
            }

            int.TryParse(data.ServerInfo.PlayerCount_I, out int playerCount);
            
            var log = new ServerInfoLog
            {
                Timestamp = DateTime.Now,
                PlayerCount = playerCount,
                MaxPlayers = data.ServerInfo.MaxPlayers,
                MapName = data.ServerInfo.MapName_s,
                ServerName = data.ServerInfo.ServerName_s
            };

            using (var db = DbHelper.GetInstance())
            {
                // Create table if not exists (SqlSugar does this automatically if configured, but good to be safe or rely on DbHelper's logic)
                // DbHelper doesn't seem to explicitly create tables on get instance, but usually CodeFirst is used.
                // We'll rely on SqlSugar's CodeFirst capability if we can call it, or assume it works.
                // To be safe, let's call InitTables.
                db.CodeFirst.InitTables<ServerInfoLog>();

                // 1. Insert new record
                await db.Insertable(log).ExecuteCommandAsync();
                
                // 2. Cleanup old records (older than 7 days)
                var sevenDaysAgo = DateTime.Now.AddDays(-7);
                await db.Deleteable<ServerInfoLog>().Where(x => x.Timestamp < sevenDaysAgo).ExecuteCommandAsync();
            }
            
            _logger.LogInformation($"[ServerInfoStorage] Recorded: {log.PlayerCount} players on {log.MapName}.");
        }
    }
}