using System;

namespace Glass.Testbed
{
    /// <summary>
    /// How many garbage collections of each generation have run, for the frame readout.
    /// </summary>
    public readonly struct CollectionCounts
    {
        public readonly int Gen0;
        public readonly int Gen1;
        public readonly int Gen2;

        public CollectionCounts(int gen0, int gen1, int gen2)
        {
            Gen0 = gen0;
            Gen1 = gen1;
            Gen2 = gen2;
        }

        public static CollectionCounts Current()
        {
            return new CollectionCounts(GC.CollectionCount(0), GC.CollectionCount(1), GC.CollectionCount(2));
        }

        public static CollectionCounts operator -(CollectionCounts lhs, CollectionCounts rhs)
        {
            return new CollectionCounts(lhs.Gen0 - rhs.Gen0, lhs.Gen1 - rhs.Gen1, lhs.Gen2 - rhs.Gen2);
        }

        public static CollectionCounts operator +(CollectionCounts lhs, CollectionCounts rhs)
        {
            return new CollectionCounts(lhs.Gen0 + rhs.Gen0, lhs.Gen1 + rhs.Gen1, lhs.Gen2 + rhs.Gen2);
        }
    }
}