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 * OPC Foundation MIT License 1.00
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using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Opc.Ua;
using Opc.Ua.Aas.Server.Materialization;

namespace AasSample
{
    /// <summary>
    /// Small in-memory document store used by the sample materialization coordinator.
    /// </summary>
    public sealed class AasSampleMaterializationDocumentStore : IAasMaterializationDocumentStore
    {
        /// <summary>
        /// Initializes the store.
        /// </summary>
        public AasSampleMaterializationDocumentStore(ArrayOf<AasMaterializationDocument> documents)
        {
            m_documents = documents.IsNull ? [] : documents;
        }

        /// <summary>
        /// Gets the last states applied by the coordinator.
        /// </summary>
        public ArrayOf<AasMaterializationDocumentState> States { get; private set; } = [];

        /// <inheritdoc/>
        public ValueTask<ArrayOf<AasMaterializationDocument>> GetDocumentsAsync(
            ArrayOf<string> targets,
            CancellationToken cancellationToken = default)
        {
            cancellationToken.ThrowIfCancellationRequested();
            if (targets.IsNull || targets.Count == 0)
            {
                return new ValueTask<ArrayOf<AasMaterializationDocument>>(m_documents);
            }

            var documents = new List<AasMaterializationDocument>();
            for (int ii = 0; ii < targets.Count; ii++)
            {
                for (int jj = 0; jj < m_documents.Count; jj++)
                {
                    if (string.Equals(targets[ii], m_documents[jj].Xid, StringComparison.Ordinal))
                    {
                        documents.Add(m_documents[jj]);
                    }
                }
            }
            return new ValueTask<ArrayOf<AasMaterializationDocument>>(new ArrayOf<AasMaterializationDocument>(
                documents.ToArray()));
        }

        /// <inheritdoc/>
        public ValueTask ApplyMaterializationAsync(
            ArrayOf<AasMaterializationDocumentState> states,
            CancellationToken cancellationToken = default)
        {
            cancellationToken.ThrowIfCancellationRequested();
            States = states.IsNull ? [] : states;
            return ValueTask.CompletedTask;
        }

        /// <inheritdoc/>
        public ValueTask<AasMaterializationDocument> UpdateValueAsync(
            AasValueWriteBackRequest request,
            CancellationToken cancellationToken = default)
        {
            cancellationToken.ThrowIfCancellationRequested();
            throw new ServiceResultException(StatusCodes.BadNotWritable);
        }

        private readonly ArrayOf<AasMaterializationDocument> m_documents;
    }
}