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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Opc.Ua.Server;
using Opc.Ua.Server.TestFramework;
using Opc.Ua.Vision.Server;
using Opc.Ua.Vision.Server.Builders;

namespace Opc.Ua.Vision.Tests
{
    /// <summary>
    /// Boots a StandardServer instance and attaches a
    /// <see cref="VisionNodeManager"/> so tests can exercise the fluent
    /// build context and node-manager lifecycle against a real address
    /// space rather than through a bag of mocks.
    /// </summary>
    internal sealed class VisionServerFixture : IAsyncDisposable
    {
        private ServerFixture<StandardServer>? m_fixture;

        public StandardServer Server { get; private set; } = null!;

        public ApplicationConfiguration Configuration =>
            m_fixture?.Config ??
            throw new InvalidOperationException("The Vision server fixture is not started.");

        public VisionNodeManager Manager { get; private set; } = null!;

        public IVisionBuildContext CreateBuildContext()
        {
            return Manager.CreateVisionBuildContext();
        }

        public async Task StartAsync()
        {
            m_fixture = new ServerFixture<StandardServer>(
                telemetry => new StandardServer(telemetry))
            {
                AutoAccept = true,
                SecurityNone = true
            };
            Server = await m_fixture.StartAsync().ConfigureAwait(false);

            Manager = new VisionNodeManager(
                Server.CurrentInstance,
                m_fixture.Config);
            var externalReferences = new Dictionary<NodeId, IList<IReference>>();
            await Manager.CreateAddressSpaceAsync(externalReferences)
                .ConfigureAwait(false);
        }

        public async ValueTask DisposeAsync()
        {
            if (Manager != null)
            {
                await Manager.DisposeAsync().ConfigureAwait(false);
            }
            if (m_fixture != null)
            {
                await m_fixture.StopAsync().ConfigureAwait(false);
            }
        }
    }
}