// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.


//
//
// This class identifies a deployment or manifest identity.
//

namespace System {
    using System.Reflection;
    using System.Security;
    using System.Security.Policy;
    using System.Security.Util;
    using System.Text;
    using System.Diagnostics.Contracts;

    [Serializable]
    [System.Runtime.InteropServices.ComVisible(true)]
    public sealed class ApplicationId {
        private string m_name;
        private Version m_version;
        private string m_processorArchitecture;
        private string m_culture;
        internal byte[] m_publicKeyToken;

        internal ApplicationId () {}

        //
        // Public.
        //

        public ApplicationId (byte[] publicKeyToken, string name, Version version, string processorArchitecture, string culture) {
            if (name == null)
                throw new ArgumentNullException(nameof(name));
            if (name.Length == 0)
                throw new ArgumentException(Environment.GetResourceString("Argument_EmptyApplicationName"));
            if (version == null)
                throw new ArgumentNullException(nameof(version));
            if (publicKeyToken == null)
                throw new ArgumentNullException(nameof(publicKeyToken));
            Contract.EndContractBlock();

            m_publicKeyToken = new byte[publicKeyToken.Length];
            Array.Copy(publicKeyToken, 0, m_publicKeyToken, 0, publicKeyToken.Length);
            m_name = name;
            m_version = version;
            m_processorArchitecture = processorArchitecture;
            m_culture = culture;
        }

        public byte[] PublicKeyToken {
            get {
                byte[] publicKeyToken = new byte[m_publicKeyToken.Length];
                Array.Copy(m_publicKeyToken, 0, publicKeyToken, 0, m_publicKeyToken.Length);
                return publicKeyToken;
            }
        }

        public string Name {
            get {
                return m_name;
            }
        }

        public Version Version {
            get {
                return m_version;
            }
        }

        public string ProcessorArchitecture {
            get {
                return m_processorArchitecture;
            }
        }

        public string Culture {
            get {
                return m_culture;
            }
        }

        public ApplicationId Copy () {
            return new ApplicationId(m_publicKeyToken, m_name, m_version, m_processorArchitecture, m_culture);
        }

        public override string ToString () {
            StringBuilder sb = StringBuilderCache.Acquire();
            sb.Append(this.m_name);
            if (m_culture != null) {
                sb.Append(", culture=\"");
                sb.Append(m_culture);
                sb.Append("\"");
            }
            sb.Append(", version=\"");
            sb.Append(m_version.ToString());
            sb.Append("\"");
            if (m_publicKeyToken != null) {
                sb.Append(", publicKeyToken=\"");
                sb.Append(Hex.EncodeHexString(m_publicKeyToken));
                sb.Append("\"");
            }
            if (m_processorArchitecture != null) {
                sb.Append(", processorArchitecture =\"");
                sb.Append(this.m_processorArchitecture);
                sb.Append("\"");
            }
            return StringBuilderCache.GetStringAndRelease(sb);
        }

        public override bool Equals (Object o) {
            ApplicationId other = (o as ApplicationId);
            if (other == null)
                return false;

            if (!(Equals(this.m_name, other.m_name) &&
                  Equals(this.m_version, other.m_version) &&
                  Equals(this.m_processorArchitecture, other.m_processorArchitecture) &&
                  Equals(this.m_culture, other.m_culture)))
                return false;

            if (this.m_publicKeyToken.Length != other.m_publicKeyToken.Length)
                return false;

            for (int i = 0; i < this.m_publicKeyToken.Length; ++i) {
                if (this.m_publicKeyToken[i] != other.m_publicKeyToken[i])
                    return false;
            }

            return true;
        }

        public override int GetHashCode() {
            // Note: purposely skipping publicKeyToken, processor architecture and culture as they
            // are less likely to make things not equal than name and version.
            return m_name.GetHashCode() ^ m_version.GetHashCode();
        }
    }
}