// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

using System.Globalization;
using System.ServiceModel;

namespace System.IdentityModel.Tokens
{
    public class LocalIdKeyIdentifierClause : SecurityKeyIdentifierClause
    {
        private readonly string _localId;
        private readonly Type[] _ownerTypes;

        public LocalIdKeyIdentifierClause(string localId)
            : this(localId, (Type[])null)
        {
        }

        public LocalIdKeyIdentifierClause(string localId, Type ownerType)
            : this(localId, ownerType == null ? (Type[])null : new Type[] { ownerType })
        {
        }

        public LocalIdKeyIdentifierClause(string localId, byte[] derivationNonce, int derivationLength, Type ownerType)
            : this(null, derivationNonce, derivationLength, ownerType == null ? (Type[])null : new Type[] { ownerType })
        {
        }

        internal LocalIdKeyIdentifierClause(string localId, Type[] ownerTypes)
            : this(localId, null, 0, ownerTypes)
        {
        }

        internal LocalIdKeyIdentifierClause(string localId, byte[] derivationNonce, int derivationLength, Type[] ownerTypes)
            : base(null, derivationNonce, derivationLength)
        {
            if (localId == null)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("localId");
            }
            if (localId == string.Empty)
            {
                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument(SR.LocalIdCannotBeEmpty);
            }
            _localId = localId;
            _ownerTypes = ownerTypes;
        }

        public string LocalId
        {
            get { return _localId; }
        }

        public Type OwnerType
        {
            get { return (_ownerTypes == null || _ownerTypes.Length == 0) ? null : _ownerTypes[0]; }
        }

        public override bool Matches(SecurityKeyIdentifierClause keyIdentifierClause)
        {
            LocalIdKeyIdentifierClause that = keyIdentifierClause as LocalIdKeyIdentifierClause;
            return ReferenceEquals(this, that) || (that != null && that.Matches(_localId, this.OwnerType));
        }

        public bool Matches(string localId, Type ownerType)
        {
            if (string.IsNullOrEmpty(localId))
                return false;
            if (_localId != localId)
                return false;
            if (_ownerTypes == null || ownerType == null)
                return true;

            for (int i = 0; i < _ownerTypes.Length; ++i)
            {
                if (_ownerTypes[i] == null || _ownerTypes[i] == ownerType)
                    return true;
            }
            return false;
        }

        public override string ToString()
        {
            return string.Format(CultureInfo.InvariantCulture, "LocalIdKeyIdentifierClause(LocalId = '{0}', Owner = '{1}')", this.LocalId, this.OwnerType);
        }
    }
}
