///
/// Copyright (c) 2013-2015 Sensus Metering Systems
///
namespace TBF.Boxes
{
    public class FloatBox : IBox
    {
		/// Box value
		private float val;
        public float Val
		{
			get { return (valid ? val : 0); }
			set { val = value; valid = true; }
		}

		/// Box name
        string name;
		public string Name
		{
			get { return name; }
			set { name = value; }
		}

		/// Validity flag: true = the box value is valid
		private bool valid = false;
		public bool Valid
		{
			get { return valid; }
		}

		/// <summary> Parameterless constructor </summary>
        public FloatBox()
        {
        }

		/// <summary> Constructor that initializes the value </summary>
		public FloatBox(float val)
        {
            this.Val = val;
        }

		/// <summary>
		/// Clear the box value and the valid flag
		/// </summary>
		public void Clear()
		{
			val = 0;
			valid = false;
		}

        ///
		/// Specifies a conversion to a string.
        /// In the most complex case the conversion is:
		///		string.Format(FormatEx, val.ToString(Format))
		///	If the value is invalid, the conversion result is 'FormatInvalid'.
        ///	
		public string Format = null;		/// Used as an argument of ToString.) function
        public string FormatEx = "{0}";		/// Used as the first argument of string.Format(...), can be modified to contain units, etc.
        public string FormatInvalid = "---";
        public float Factor = 1.0f;
        public float LimitLo = float.MinValue;
        public float LimitHi = float.MaxValue;

		/// <summary>
		/// Converts the box value to a string representation
		/// </summary>
		public override string ToString()
        {
			if (!valid)
			{
				return FormatInvalid;
			}
			else if (Format == null)
			{
                return string.Format(FormatEx, Val * Factor);
			}
			else
			{
                return string.Format(FormatEx, (Val * Factor).ToString(Format));
			}
        }

		/// <summary>
		/// Validate the string representation of the box value
		/// </summary>
		/// <param name="strVal">String representation of the parameter</param>
		/// <returns>true = string is OK, false = string is wrong (see 'message')</returns>
		public bool ValidateParam(string strVal)
		{
			float dummy;
            return Utils.TryParseSFloat(strVal, out dummy) &&
                             ((dummy / Factor) >= LimitLo) &&
                             ((dummy / Factor) <= LimitHi);
		}

		/// <summary>
		/// Update the parameter from a string
		/// </summary>
		/// <param name="strVal">String representation of the box value</param>
		public void UpdateParam(string strVal)
		{
			try
			{
				Val = Utils.ParseSFloat(strVal) / Factor;
			}
			catch { };
		}


		public FloatBox Clone()
		{
            FloatBox newFloatBox = new FloatBox();
            newFloatBox.name = name;
            newFloatBox.val = val;
            newFloatBox.valid = valid;
            newFloatBox.Format = Format;
            newFloatBox.FormatInvalid = FormatInvalid;
            newFloatBox.FormatEx = FormatEx;
            newFloatBox.Factor = Factor;
            return newFloatBox;
		}
	}
}