using Newtonsoft.Json;
using NLog;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EgwControlCenter.Core
{
    public class TaskRunStats
    {
        #region Public Constructors

        /// <summary>
        /// init da vuoto
        /// </summary>
        public TaskRunStats()
        {
            // init generico senza reload file
        }

        /// <summary>
        /// Init classe con rilettura dati
        /// </summary>
        public TaskRunStats(string appDir, string confName)
        {
            AppDir = appDir;
            ConfName = confName;
            // inizio rileggendo (se presenti) dati conf da disco
            tryReload();
        }

        #endregion Public Constructors

        #region Public Properties

        /// <summary>
        /// Tempo medio complessivo registrato
        /// </summary>
        public TimeSpan AvgTotalTime
        {
            get
            {
                TimeSpan answ = new TimeSpan();
                if (TaskData != null && TaskData.Count > 0)
                {
                    foreach (var record in TaskData)
                    {
                        answ += record.Value.AvgTime;
                    }
                }
                return answ;
            }
        }

        /// <summary>
        /// nome del task registrato
        /// </summary>
        public Dictionary<string, TaskStat> TaskData { get; set; } = new Dictionary<string, TaskStat>();

        #endregion Public Properties

        #region Public Methods

        /// <summary>
        /// Tempo medio per un Task
        /// </summary>
        public TimeSpan AvgTaskTime(string taskName)
        {
            TimeSpan answ = new TimeSpan();
            if (TaskData != null && TaskData.Count > 0)
            {
                if (TaskData.ContainsKey(taskName))
                {
                    answ = TaskData[taskName].AvgTime;
                }
            }
            return answ;
        }

        /// <summary>
        /// Registro una singola esecuzione x effettuare valutazioni successive...
        /// </summary>
        /// <param name="taskName"></param>
        /// <param name="duration"></param>
        public void RecordExeData(string taskName, TimeSpan duration)
        {
            // cerco nel dizionario se presente
            if (TaskData.ContainsKey(taskName))
            {
                TaskData[taskName].NumRun++;
                TaskData[taskName].TotalTime += duration;
            }
            else
            {
                TaskData.Add(taskName, new TaskStat() { NumRun = 1, TotalTime = duration });
            }
        }

        /// <summary>
        /// Salva le statistiche su disco
        /// </summary>
        public void SaveToDisk()
        {
            var rawData = JsonConvert.SerializeObject(TaskData, Formatting.Indented);
            if (rawData != null && rawData.Length > 2)
            {
                File.WriteAllText(StatsPath, rawData);
            }
        }

        #endregion Public Methods

        #region Private Fields

        private static Logger Log = LogManager.GetCurrentClassLogger();

        #endregion Private Fields

        #region Private Properties

        private string AppDir { get; set; } = "";

        private string ConfName { get; set; } = "";

        /// <summary>
        /// Path file di conf check
        /// </summary>
        private string StatsPath
        {
            get => Path.Combine(AppDir, ConfName);
        }

        #endregion Private Properties

        #region Private Methods

        private void tryReload()
        {
            if (File.Exists(StatsPath))
            {
                string rawData = File.ReadAllText(StatsPath);
                if (!string.IsNullOrEmpty(rawData) && rawData.Length > 2)
                {
                    try
                    {
                        TaskData = JsonConvert.DeserializeObject<Dictionary<string, TaskStat>>(rawData);
                    }
                    catch (Exception exc)
                    {
                        Log.Error($"Eccezione in tryReload:{Environment.NewLine}{exc}");
                    }
                }
            }
        }

        #endregion Private Methods
    }
}