using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;

using Newtonsoft.Json;

using Shadowsocks.Controller;

namespace Shadowsocks.Model
{
    [Serializable]
    public class StatisticsStrategyConfiguration
    {
        public static readonly string ID = "com.shadowsocks.strategy.statistics";
        private bool _statisticsEnabled = true;
        private bool _byIsp = false;
        private bool _byHourOfDay = false;
        private int _choiceKeptMinutes = 10;
        private int _dataCollectionMinutes = 10;
        private int _repeatTimesNum = 4;

        private const string ConfigFile = "statistics-config.json";

        public static StatisticsStrategyConfiguration Load()
        {
            try
            {
                var content = File.ReadAllText(ConfigFile);
                var configuration = JsonConvert.DeserializeObject<StatisticsStrategyConfiguration>(content);
                return configuration;
            }
            catch (FileNotFoundException)
            {
                var configuration = new StatisticsStrategyConfiguration();
                Save(configuration);
                return configuration;
            }
            catch (Exception e)
            {
                Logging.LogUsefulException(e);
                return new StatisticsStrategyConfiguration();
            }
        }

        public static void Save(StatisticsStrategyConfiguration configuration)
        {
            try
            {
                var content = JsonConvert.SerializeObject(configuration, Formatting.Indented);
                File.WriteAllText(ConfigFile, content);
            }
            catch (Exception e)
            {
                Logging.LogUsefulException(e);
            }
        }

        public Dictionary<string, float> Calculations;

        public StatisticsStrategyConfiguration()
        {
            var availabilityStatisticsType = typeof(AvailabilityStatistics);
            var statisticsData = availabilityStatisticsType.GetNestedType("StatisticsData");
            var properties = statisticsData.GetFields(BindingFlags.Instance | BindingFlags.Public);
            Calculations = properties.ToDictionary(p => p.Name, _ => (float)0);
        }

        public bool StatisticsEnabled
        {
            get { return _statisticsEnabled; }
            set { _statisticsEnabled = value; }
        }

        public bool ByIsp
        {
            get { return _byIsp; }
            set { _byIsp = value; }
        }

        public bool ByHourOfDay
        {
            get { return _byHourOfDay; }
            set { _byHourOfDay = value; }
        }

        public int ChoiceKeptMinutes
        {
            get { return _choiceKeptMinutes; }
            set { _choiceKeptMinutes = value; }
        }

        public int DataCollectionMinutes
        {
            get { return _dataCollectionMinutes; }
            set { _dataCollectionMinutes = value; }
        }

        public int RepeatTimesNum
        {
            get { return _repeatTimesNum; }
            set { _repeatTimesNum = value; }
        }
    }
}