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

using System.Collections;
using System.Globalization;
using System.Runtime.InteropServices;

namespace System.DirectoryServices.ActiveDirectory
{
    public class ActiveDirectoryReplicationMetadata : DictionaryBase
    {
        private readonly DirectoryServer _server;
        private readonly Hashtable _nameTable;

        internal ActiveDirectoryReplicationMetadata(DirectoryServer server)
        {
            _server = server;
            Hashtable tempNameTable = new Hashtable();
            _nameTable = Hashtable.Synchronized(tempNameTable);
        }

        public AttributeMetadata? this[string name]
        {
            get
            {
                string tempName = name.ToLowerInvariant();
                if (Contains(tempName))
                {
                    return (AttributeMetadata)InnerHashtable[tempName]!;
                }
                else
                    return null;
            }
        }

        public ReadOnlyStringCollection AttributeNames { get; } = new ReadOnlyStringCollection();

        public AttributeMetadataCollection Values { get; } = new AttributeMetadataCollection();

        public bool Contains(string attributeName)
        {
            string tempName = attributeName.ToLowerInvariant();
            return Dictionary.Contains(tempName);
        }

        public void CopyTo(AttributeMetadata[] array, int index)
        {
            Dictionary.Values.CopyTo((Array)array, index);
        }

        private void Add(string name, AttributeMetadata value)
        {
            Dictionary.Add(name.ToLowerInvariant(), value);

            AttributeNames.Add(name);
            Values.Add(value);
        }

        internal void AddHelper(int count, IntPtr info, bool advanced)
        {
            IntPtr addr = (IntPtr)0;

            for (int i = 0; i < count; i++)
            {
                if (advanced)
                {
                    addr = IntPtr.Add(info, sizeof(int) * 2 + i * Marshal.SizeOf<DS_REPL_ATTR_META_DATA_2>());

                    AttributeMetadata managedMetaData = new AttributeMetadata(addr, true, _server, _nameTable);
                    Add(managedMetaData.Name, managedMetaData);
                }
                else
                {
                    addr = IntPtr.Add(info, sizeof(int) * 2 + i * Marshal.SizeOf<DS_REPL_ATTR_META_DATA>());

                    AttributeMetadata managedMetaData = new AttributeMetadata(addr, false, _server, _nameTable);
                    Add(managedMetaData.Name, managedMetaData);
                }
            }
        }
    }
}