lmxopcua/tests/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/FakeTwinCATClient.cs

using ZB.MOM.WW.OtOpcUa.Driver.TwinCAT;

namespace ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests;

internal class FakeTwinCATClient : ITwinCATClient
{
    public bool IsConnected { get; private set; }
    public int ConnectCount { get; private set; }
    public int DisposeCount { get; private set; }
    public bool ThrowOnConnect { get; set; }
    public bool ThrowOnRead { get; set; }
    public bool ThrowOnWrite { get; set; }
    public bool ThrowOnProbe { get; set; }
    public Exception? Exception { get; set; }
    public Dictionary<string, object?> Values { get; } = new(StringComparer.OrdinalIgnoreCase);
    public Dictionary<string, uint> ReadStatuses { get; } = new(StringComparer.OrdinalIgnoreCase);
    public Dictionary<string, uint> WriteStatuses { get; } = new(StringComparer.OrdinalIgnoreCase);
    public List<(string symbol, TwinCATDataType type, int? bit, object? value)> WriteLog { get; } = new();
    public bool ProbeResult { get; set; } = true;

    public virtual Task ConnectAsync(TwinCATAmsAddress address, TimeSpan timeout, CancellationToken ct)
    {
        ConnectCount++;
        if (ThrowOnConnect) throw Exception ?? new InvalidOperationException();
        IsConnected = true;
        return Task.CompletedTask;
    }

    public virtual Task<(object? value, uint status)> ReadValueAsync(
        string symbolPath, TwinCATDataType type, int? bitIndex, CancellationToken ct)
    {
        if (ThrowOnRead) throw Exception ?? new InvalidOperationException();
        var status = ReadStatuses.TryGetValue(symbolPath, out var s) ? s : TwinCATStatusMapper.Good;
        var value = Values.TryGetValue(symbolPath, out var v) ? v : null;
        return Task.FromResult((value, status));
    }

    public virtual Task<uint> WriteValueAsync(
        string symbolPath, TwinCATDataType type, int? bitIndex, object? value, CancellationToken ct)
    {
        if (ThrowOnWrite) throw Exception ?? new InvalidOperationException();
        WriteLog.Add((symbolPath, type, bitIndex, value));
        Values[symbolPath] = value;
        var status = WriteStatuses.TryGetValue(symbolPath, out var s) ? s : TwinCATStatusMapper.Good;
        return Task.FromResult(status);
    }

    public virtual Task<bool> ProbeAsync(CancellationToken ct)
    {
        if (ThrowOnProbe) return Task.FromResult(false);
        return Task.FromResult(ProbeResult);
    }

    public virtual void Dispose()
    {
        DisposeCount++;
        IsConnected = false;
    }
}

internal sealed class FakeTwinCATClientFactory : ITwinCATClientFactory
{
    public List<FakeTwinCATClient> Clients { get; } = new();
    public Func<FakeTwinCATClient>? Customise { get; set; }

    public ITwinCATClient Create()
    {
        var client = Customise?.Invoke() ?? new FakeTwinCATClient();
        Clients.Add(client);
        return client;
    }
}