using System;
using ArchestrA;
using ZB.MOM.WW.LmxOpcUa.Historian.Aveva;
using ZB.MOM.WW.LmxOpcUa.Host.Configuration;

namespace ZB.MOM.WW.LmxOpcUa.Historian.Aveva.Tests
{
    /// <summary>
    ///     Fake Historian connection factory for tests. Controls whether connections
    ///     succeed, fail, or timeout without requiring the real Historian SDK runtime.
    /// </summary>
    internal sealed class FakeHistorianConnectionFactory : IHistorianConnectionFactory
    {
        public Exception? ConnectException { get; set; }

        public int ConnectCallCount { get; private set; }

        public Action<int>? OnConnect { get; set; }

        public HistorianAccess CreateAndConnect(HistorianConfiguration config, HistorianConnectionType type)
        {
            ConnectCallCount++;

            if (OnConnect != null)
            {
                OnConnect(ConnectCallCount);
            }
            else if (ConnectException != null)
            {
                throw ConnectException;
            }

            // Return a HistorianAccess that is not actually connected.
            // ReadRawAsync etc. will fail when they try to use it, which exercises
            // the HandleConnectionError → reconnect path.
            return new HistorianAccess();
        }
    }
}