using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CloudBuilder.Gui
{
    public class ExFormSnapshotEntry
    {
        public string ControlName { get; set; }
        public string DataPropertyName { get; set; }
        public string DisplayName { get; set; }
        public string DisplayValue { get; set; }
        public object Value { get; set; }

        // Methods
        public ExFormSnapshotEntry()
        {

        }

        public ExFormSnapshotEntry(string controlName, string displayName, object value, string displayValue)
            : this(controlName, displayName, value, displayValue, null)
        {
        }

        public ExFormSnapshotEntry(string controlName, string displayName, object value, string displayValue, string dataPropertyName)
        {
            ControlName = controlName;
            DisplayName = displayName;
            DisplayValue = displayValue;
            Value = value;
            DataPropertyName = dataPropertyName;
        }

        private static bool IsNull(object value)
        {
            if (value == null) return true;

            if (value is string) return string.IsNullOrEmpty((string)value);

            if (value is DBNull) return true;

            return false;
        }

        public static bool Compare(object v1, object v2)
        {
            bool b1 = IsNull(v1);
            bool b2 = IsNull(v2);

            if (b1 == b2 && b1 == true) return true;

            return v1.Equals(v2);
        }

        public ExFormSnapshotDifferenceEntry Compare(ExFormSnapshotEntry o)
        {
            if (!Compare(this.Value, o.Value))
            {
                return new ExFormSnapshotDifferenceEntry(this.ControlName, this.DisplayName, this.Value, this.DisplayValue, o.Value, o.DisplayValue, this.DataPropertyName);
            }

            return null;
        }
    }
}