// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.


using System;


// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//

namespace GCVariant
{
    internal class GCVariant
    {
        internal static object[] G_Vart;

        public static int Main(string[] args)
        {
            int iRep = 0;
            int iObj = 0;
            int iNum = 0;
            Console.WriteLine("Test should return with ExitCode 100 ...");

            switch (args.Length)
            {
                case 1:
                    if (!Int32.TryParse(args[0], out iRep))
                    {
                        iRep = 5;
                    }
                    iObj = 100;
                    iNum = 10;
                    break;

                case 2:
                    if (!Int32.TryParse(args[0], out iRep))
                    {
                        iRep = 5;
                    }
                    if (!Int32.TryParse(args[1], out iObj))
                    {
                        iObj = 100;
                    }
                    iNum = 10;
                    break;

                case 3:
                    if (!Int32.TryParse(args[0], out iRep))
                    {
                        iRep = 5;
                    }
                    if (!Int32.TryParse(args[1], out iObj))
                    {
                        iObj = 100;
                    }
                    if (!Int32.TryParse(args[2], out iNum))
                    {
                        iNum = 10;
                    }
                    break;

                default:
                    iRep = 5;
                    iObj = 100;
                    iNum = 10;
                    break;
            }


            Console.Write("iRep= ");
            Console.Write(iRep);
            Console.Write(" iObj= ");
            Console.Write(iObj);
            Console.Write(" iNum= ");
            Console.WriteLine(iNum);

            GCVariant Mv_Obj = new GCVariant();

            if (Mv_Obj.runTest(iRep, iObj, iNum))
            {
                Console.WriteLine("Test Passed");
                return 100;
            }
            Console.WriteLine("Test Failed");
            return 1;
        }


        public bool runTest(int iRep, int iObj, int iNum)
        {
            DoubLink L_Node1 = new DoubLink(iNum);
            DLinkNode L_Node2 = new DLinkNode(iNum, null, null);

            for (int i = 0; i < iRep; i++)
            {
                G_Vart = new Object[iObj];
                for (int j = 0; j < iObj; j++)
                {
                    if (j % 2 == 1)
                        G_Vart[j] = (L_Node1);
                    else
                        G_Vart[j] = (L_Node2);
                }
                MakeLeak(iRep, iObj, iNum);
            }
            return true;
        }


        public void MakeLeak(int iRep, int iObj, int iNum)
        {
            DoubLink L_Node1 = new DoubLink(iNum);
            DLinkNode L_Node2 = new DLinkNode(iNum, null, null);
            Object[] L_Vart1 = new Object[iObj];
            Object[] L_Vart2;

            for (int i = 0; i < iRep; i++)
            {
                L_Vart2 = new Object[iObj];
                for (int j = 0; j < iObj; j++)
                {
                    if (j % 2 == 1)
                    {
                        L_Vart1[j] = (j);
                        L_Vart2[j] = ((double)j);
                    }
                    else
                    {
                        L_Vart2[j] = (L_Node2);
                        L_Vart1[j] = (L_Node1);
                    }
                }
            }
        }
    }

    public class DoubLink
    {
        internal DLinkNode[] Mv_DLink;

        public DoubLink(int Num)
            : this(Num, false)
        {
        }

        public DoubLink(int Num, bool large)
        {
            Mv_DLink = new DLinkNode[Num];

            if (Num == 0)
            {
                return;
            }

            if (Num == 1)
            {
                // only one element
                Mv_DLink[0] = new DLinkNode((large ? 256 : 1), Mv_DLink[0], Mv_DLink[0]);
                return;
            }

            // first element
            Mv_DLink[0] = new DLinkNode((large ? 256 : 1), Mv_DLink[Num - 1], Mv_DLink[1]);

            // all elements in between
            for (int i = 1; i < Num - 1; i++)
            {
                Mv_DLink[i] = new DLinkNode((large ? 256 : i + 1), Mv_DLink[i - 1], Mv_DLink[i + 1]);
            }

            // last element
            Mv_DLink[Num - 1] = new DLinkNode((large ? 256 : Num), Mv_DLink[Num - 2], Mv_DLink[0]);
        }


        public int NodeNum
        {
            get
            {
                return Mv_DLink.Length;
            }
        }
    }

    public class DLinkNode
    {
        // disabling unused variable warning
#pragma warning disable 0414
        internal DLinkNode Last;
        internal DLinkNode Next;
#pragma warning restore 0414

        internal int[] Size;

        public DLinkNode(int SizeNum, DLinkNode LastObject, DLinkNode NextObject)
        {
            Last = LastObject;
            Next = NextObject;
            Size = new int[SizeNum * 1024];
            Size[0] = 1;
            Size[SizeNum * 1024 - 1] = 2;
        }
    }
}
