using System;
using System.Collections.Generic;
using System.Text;

namespace ISO
{
    /// <summary>
    /// a simple setting in a test
    /// can have a default value, a value, and an id
    /// default value is used by TestSettingsDictionary for when
    /// the setting doesn't currently exist or have a value
    /// </summary>
    public class TestSetting
    {
        //public string Id { get; }
        public int Id { get; }
        public string Value { get; set; }

        public string DefaultValue { get; }
        private const string SEPARATOR = "_x_";
        public TestSetting(TestSetting copy, string value)
        {
            Id = copy.Id;
            DefaultValue = copy.DefaultValue;
            Value = value;
        }
        public TestSetting(TestSetting copy)
        {
            Id = copy.Id;
            DefaultValue = copy.DefaultValue;
            Value = copy.Value;
        }
        public TestSetting(int id, string value, string defaultValue)
        {
            Id = id;
            Value = value;
            DefaultValue = defaultValue;
        }

        public TestSetting(TestSettingsEnum id, string value, string defaultValue)
        {
            Id = (int)id;
            Value = value;
            DefaultValue = defaultValue;
        }
        public string ToSerializeString()
        {
            return $"{Id}={Value.Replace("=", SEPARATOR)}";
        }

        public static bool TryParse(string s, out TestSetting ts)
        {
            ts = null;

            var tokens = s.Split(new[] { "=" }, StringSplitOptions.None);
            if (tokens.Length < 2) { return false; }
            var id = tokens[0].Replace(SEPARATOR, "=");
            var val = tokens[1].Replace(SEPARATOR, "=");
            if (Enum.TryParse(id, out TestSettingsEnum enumValue))
            {
                ts = new TestSetting(enumValue, val, val);
                return true;
            }
            if (int.TryParse(id, out var iTemp))
            {
                ts = new TestSetting(iTemp, val, val);
                return true;
            }
            return false;
        }
    }
    /// <summary>
    /// list of all non columned test settings
    /// </summary>
    public enum TestSettingsEnum
    {
        ArmCheckListStep,
        CheckListInputVoltageCheck,
        CheckListBatteryVoltageCheck,
        CheckListSquibResistanceCheck,
        CheckListSensorIDCheck,
        CheckListTriggerStartCheck,
        CheckListTiltSensorCheck,
        CheckListTemperatureCheck,
        CheckListClockSyncCheck,
        EW,//ExcitationWarmup
        CheckListMustPass
    }

    /// <summary>
    /// holds all possible settings for a test
    /// </summary>
    public class TestSettingDictionary
    {
        public TestSettingDictionary()
        {
        }
        public TestSettingDictionary(TestSettingDictionary copy)
        {
            using (var e = copy._lookup.GetEnumerator())
            {
                while (e.MoveNext())
                {
                    _lookup[e.Current.Key] = new TestSetting(e.Current.Value);
                }
            }
        }
        private const string SEPARATOR = "_X_";
        private readonly Dictionary<int, TestSetting> _lookup = new Dictionary<int, TestSetting>();
        public string GetValue(int id, string defaultValue)
        {
            if (!_lookup.ContainsKey(id)) { return defaultValue; }
            return _lookup[id].Value ?? _lookup[id].DefaultValue;
        }

        public string GetValue(TestSettingsEnum id, string defaultValue)
        {
            return GetValue((int)id, defaultValue);
        }
        public void UnLoad()
        {
            _lookup.Clear();
        }
        /// <summary>
        /// used to change the value in the dictionary (just the value, leave everything else the same)
        /// </summary>
        /// <param name="setting"></param>
        /// <param name="value"></param>
        public void SetValue(TestSetting setting, string value)
        {
            //we do it this way to avoid Add() and also to avoid accidentally reusing the input setting inappropriately
            _lookup[setting.Id] = new TestSetting(setting, value);
        }
        /// <summary>
        /// used to initialize a value in the dictionary
        /// </summary>
        /// <param name="setting"></param>
        public void SetValue(TestSetting setting)
        {
            _lookup[setting.Id] = setting;
        }

        public void SetValue(TestSettingsEnum id, string value)
        {
            SetValue((int)id, value);
        }
        public void SetValue(int id, string value)
        {
            if (!_lookup.ContainsKey(id))
            {
                _lookup[id] = new TestSetting(id, value, value);
            }
            else { _lookup[id].Value = value; }
        }
        public string ToSerializeString()
        {
            var sb = new StringBuilder();
            foreach (var s in _lookup.Values)
            {
                var sVal = s.ToSerializeString();
                // ReSharper disable once StringIndexOfIsCultureSpecific.1
                System.Diagnostics.Trace.Assert(sVal.IndexOf(SEPARATOR) < 0);
                sVal = sVal.Replace(System.Globalization.CultureInfo.InvariantCulture.TextInfo.ListSeparator, SEPARATOR);
                if (sb.Length > 0) { sb.Append(System.Globalization.CultureInfo.InvariantCulture.TextInfo.ListSeparator); }
                sb.Append(sVal);
            }
            return sb.ToString();
        }
        public void LoadSettings(string s)
        {
            if (string.IsNullOrWhiteSpace(s)) { return; } //nothing to deserialize
            var tokens = s.Split(new[] { System.Globalization.CultureInfo.InvariantCulture.TextInfo.ListSeparator }, StringSplitOptions.None);
            foreach (var token in tokens)
            {
                var tok = token.Replace(SEPARATOR, System.Globalization.CultureInfo.InvariantCulture.TextInfo.ListSeparator);
                //we prefer the default settings from the application
                //if for some reason this key is no longer used, we can still stick it in the storage and use it as is
                if (!TestSetting.TryParse(tok, out var ts)) continue;
                if (!_lookup.ContainsKey(ts.Id))//no longer has a default setting, just use as is
                {
                    _lookup[ts.Id] = ts;
                }
                else { _lookup[ts.Id].Value = ts.Value; }//default setting exists, just set the value
            }
        }
    }
}