// (c) Copyright HutongGames, LLC 2010-2018. All rights reserved.

namespace HutongGames.PlayMaker.Actions
{
    [ActionCategory(ActionCategory.Logic)]
    [Tooltip("Tests if 2 Array Variables have the same values.")]
    public class ArrayCompare : FsmStateAction
    {
        [RequiredField]
        [UIHint(UIHint.Variable)]
        [Tooltip("The first Array Variable to test.")]
        public FsmArray array1;

        [RequiredField]
        [UIHint(UIHint.Variable)]
        [Tooltip("The second Array Variable to test.")]
        public FsmArray array2;

        [Tooltip("Event to send if the 2 arrays have the same values.")]
        public FsmEvent SequenceEqual;

        [Tooltip("Event to send if the 2 arrays have different values.")]
        public FsmEvent SequenceNotEqual;

        [UIHint(UIHint.Variable)]
        [Tooltip("Store the result in a Bool variable.")]
        public FsmBool storeResult;

        [Tooltip("Repeat every frame.")]
        public bool everyFrame;

        public override void Reset()
        {
            array1 = null;
            array2 = null;
            SequenceEqual = null;
            SequenceNotEqual = null;
        }

        public override void OnEnter()
        {
            DoSequenceEqual();
            
            if (!everyFrame)
            {
                Finish();
            }
        }

        private void DoSequenceEqual()
        {
            if (array1.Values == null || array2.Values == null) return;

            // Try to avoid Linq in runtime code. Editor is fine.
            //storeResult.Value = array1.Values.SequenceEqual(array2.Values);

            storeResult.Value = TestSequenceEqual(array1.Values, array2.Values);

            Fsm.Event(storeResult.Value ? SequenceEqual : SequenceNotEqual);
        }

        // NOTE: replaces Linq SequenceEqual. Trying to avoid Linq in runtime code.
        private bool TestSequenceEqual(object[] _array1, object[] _array2)
        {
            if (_array1.Length != _array2.Length) return false;

            for (var i = 0; i < array1.Length; i++)
            {
                if (!_array1[i].Equals(_array2[i])) return false;
            }

            return true;
        }

    }

}