using System;
using System.Text;

namespace NzbDrone.Core.Qualities
{
    public class Revision : IEquatable<Revision>, IComparable<Revision>
    {
        public Revision(Int32 version = 1, Int32 real = 0)
        {
            Version = version;
            Real = real;
        }

        public Int32 Version { get; set; }
        public Int32 Real { get; set; }

        public bool Equals(Revision other)
        {
            if (ReferenceEquals(null, other)) return false;

            return other.Version.Equals(Version) && other.Real.Equals(Real);
        }

        public int CompareTo(Revision other)
        {
            if (Real > other.Real) return 1;
            if (Real < other.Real) return -1;
            if (Version > other.Version) return 1;
            if (Version < other.Version) return -1;

            return 0;
        }

        public override string ToString()
        {
            var sb = new StringBuilder();
            sb.AppendFormat("v{0}", Version);

            if (Real > 0)
            {
                sb.AppendFormat(" Real:{0}", Real);
            }

            return sb.ToString();
        }

        public override int GetHashCode()
        {
            return Version ^ Real << 8;
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;

            return Equals(obj as Revision);
        }

        public static bool operator ==(Revision left, Revision right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(Revision left, Revision right)
        {
            return !Equals(left, right);
        }

        public static bool operator >(Revision left, Revision right)
        {
            if (left == null) return false;
            if (right == null) return true;

            return left.CompareTo(right) > 0;
        }

        public static bool operator <(Revision left, Revision right)
        {
            if (left == null) return true;
            if (right == null) return false;

            return left.CompareTo(right) < 0;
        }

        public static bool operator >=(Revision left, Revision right)
        {
            if (left == null) return false;
            if (right == null) return true;

            return left.CompareTo(right) >= 0;
        }

        public static bool operator <=(Revision left, Revision right)
        {
            if (left == null) return true;
            if (right == null) return false;

            return left.CompareTo(right) <= 0;
        }
    }
}