using System;
using System.Xml.Linq;
using System.ComponentModel;

namespace DTS.SensorDB
{
    public class SensorRange : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected bool SetProperty<T>(ref T storage, T value, String propertyName = null)
        {
            if (Equals(storage, value)) return false;

            storage = value;
            OnPropertyChanged(propertyName);
            return true;
        }
        protected void OnPropertyChanged(string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        public double Low { get; set; }

        public double Medium { get; set; }

        public double High { get; set; }

        #region Tags

        internal const string SensorRangeTag = "SensorRange";
        internal const string LowTag = "Low";
        internal const string MediumTag = "Medium";
        internal const string HighTag = "High";

        #endregion
        public SensorRange(string value)
        {
            var values = value.Split(',');
            if (3 != values.Length) { throw new System.IO.InvalidDataException("bad SensorRange, " + value); }
            Low = double.Parse(values[0]);
            Medium = double.Parse(values[1]);
            High = double.Parse(values[2]);
        }
        public string ToSerializeString()
        {
            return $"{Low.ToString(System.Globalization.CultureInfo.InvariantCulture)},{Medium.ToString(System.Globalization.CultureInfo.InvariantCulture)},{High.ToString(System.Globalization.CultureInfo.InvariantCulture)}";
        }
        private string TableName;
        internal SensorRange(XElement elem, string prefix, string tblName, string id)
        {
            TableName = tblName;
            XElement inner = null;
            try
            {
                inner = elem.Element(mkTag(prefix));
            }
            catch (ArgumentNullException)
            {
                if (!string.IsNullOrEmpty(id))
                    throw new Exception($"{TableName}: Can't find tag {prefix + "-" + SensorRangeTag} for entry {id}");
                throw new Exception($"{TableName}: Can't find tag {prefix + "-" + SensorRangeTag} in file");
            }
            Low = Double.Parse(inner.Attribute(LowTag).Value, System.Globalization.CultureInfo.InvariantCulture);
            Medium = Double.Parse(inner.Attribute(MediumTag).Value, System.Globalization.CultureInfo.InvariantCulture);
            High = Double.Parse(inner.Attribute(HighTag).Value, System.Globalization.CultureInfo.InvariantCulture);
        }

        public SensorRange(double low, double medium, double high)
        {
            Low = low;
            Medium = medium;
            High = high;
        }

        internal XElement ToXElement(string prefix)
        {
            var element = new XElement(mkTag(prefix));
            element.SetAttributeValue(LowTag, Low);
            element.SetAttributeValue(MediumTag, Medium);
            element.SetAttributeValue(HighTag, High);
            return element;
        }

        internal void Update(XElement elem, string prefix)
        {
            var element = elem.Element(mkTag(prefix));
            if (element == null) return;
            element.SetAttributeValue(LowTag, Low);
            element.SetAttributeValue(MediumTag, Medium);
            element.SetAttributeValue(HighTag, High);
        }

        internal static string mkTag(string prefix)
        {
            return prefix + "-" + SensorRangeTag;
        }
    }
}