using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Core.Abstractions;

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

/// <summary>
///     Issue #269, plan PR F4-b — <c>cnc_wrmacro</c> coverage. The driver-level
///     <c>Writes.AllowMacro</c> kill switch sits on top of the F4-a
///     <c>Writes.Enabled</c> + per-tag <c>Writable</c> opt-ins. MACRO tags
///     surface <see cref="SecurityClassification.Operate"/> (lighter ACL than PARAM)
///     because macro writes are the standard HMI-driven recipe / setpoint surface.
/// </summary>
[Trait("Category", "Unit")]
public sealed class FocasWriteMacroTests
{
    private const string Host = "focas://10.0.0.5:8193";

    private static FocasDriver NewDriver(
        FocasWritesOptions writes,
        FocasTagDefinition[] tags,
        out FakeFocasClientFactory factory)
    {
        factory = new FakeFocasClientFactory();
        return new FocasDriver(new FocasDriverOptions
        {
            Devices = [new FocasDeviceOptions(Host)],
            Tags = tags,
            Probe = new FocasProbeOptions { Enabled = false },
            Writes = writes,
        }, "drv-1", factory);
    }

    [Fact]
    public async Task AllowMacro_false_returns_BadNotWritable_even_with_Enabled_and_Writable()
    {
        var drv = NewDriver(
            writes: new FocasWritesOptions { Enabled = true, AllowMacro = false, AllowParameter = true },
            tags:
            [
                new FocasTagDefinition("M500", Host, "MACRO:500", FocasDataType.Int32, Writable: true),
            ],
            out var factory);
        await drv.InitializeAsync("{}", CancellationToken.None);

        var results = await drv.WriteAsync(
            [new WriteRequest("M500", 99)], CancellationToken.None);

        results.Single().StatusCode.ShouldBe(FocasStatusMapper.BadNotWritable);
        // Gate fires pre-EnsureConnectedAsync so no wire client gets constructed at all.
        factory.Clients.ShouldBeEmpty();
    }

    [Fact]
    public async Task AllowMacro_true_dispatches_to_typed_WriteMacroAsync()
    {
        var drv = NewDriver(
            writes: new FocasWritesOptions { Enabled = true, AllowMacro = true },
            tags:
            [
                new FocasTagDefinition("M500", Host, "MACRO:500", FocasDataType.Int32, Writable: true),
            ],
            out var factory);
        await drv.InitializeAsync("{}", CancellationToken.None);

        var results = await drv.WriteAsync(
            [new WriteRequest("M500", 99)], CancellationToken.None);

        results.Single().StatusCode.ShouldBe(FocasStatusMapper.Good);
        var log = factory.Clients[0].MacroWriteLog;
        log.Count.ShouldBe(1);
        log[0].addr.Kind.ShouldBe(FocasAreaKind.Macro);
        log[0].addr.Number.ShouldBe(500);
        log[0].value.ShouldBe(99);
        // Generic write log untouched — MACRO routes through the typed entry point.
        factory.Clients[0].WriteLog.ShouldBeEmpty();
    }

    [Fact]
    public async Task MacroWrite_round_trip_stores_value_visible_to_subsequent_read()
    {
        var drv = NewDriver(
            writes: new FocasWritesOptions { Enabled = true, AllowMacro = true },
            tags:
            [
                new FocasTagDefinition("M500", Host, "MACRO:500", FocasDataType.Int32, Writable: true),
            ],
            out var factory);
        await drv.InitializeAsync("{}", CancellationToken.None);

        await drv.WriteAsync([new WriteRequest("M500", 42)], CancellationToken.None);

        factory.Clients[0].Values["MACRO:500"].ShouldBe(42);
    }

    [Fact]
    public void Tag_classification_MACRO_yields_Operate()
    {
        // Server-layer ACL key — MACRO: tags require WriteOperate (per the
        // F4-b plan note about lighter authorization for HMI recipe writes).
        var tag = new FocasTagDefinition(
            "M500", Host, "MACRO:500", FocasDataType.Int32, Writable: true);

        FocasDriver.ClassifyTag(tag).ShouldBe(SecurityClassification.Operate);
    }

    [Fact]
    public void FocasWritesOptions_default_AllowMacro_is_false()
    {
        new FocasWritesOptions().AllowMacro.ShouldBeFalse();
        new FocasDriverOptions().Writes.AllowMacro.ShouldBeFalse();
    }

    [Fact]
    public void Dto_round_trip_preserves_AllowMacro()
    {
        const string json = """
        {
          "Backend": "unimplemented",
          "Devices": [{ "HostAddress": "focas://10.0.0.5:8193" }],
          "Tags": [{
            "Name": "M", "DeviceHostAddress": "focas://10.0.0.5:8193",
            "Address": "MACRO:500", "DataType": "Int32", "Writable": true
          }],
          "Writes": { "Enabled": true, "AllowMacro": true }
        }
        """;

        var drv = FocasDriverFactoryExtensions.CreateInstance("drv-1", json);
        drv.InitializeAsync("{}", CancellationToken.None).GetAwaiter().GetResult();

        var results = drv.WriteAsync(
            [new WriteRequest("M", 42)], CancellationToken.None).GetAwaiter().GetResult();
        // unimplemented backend — anything except BadNotWritable proves the gate let
        // the call through (likely BadCommunicationError from the no-op factory).
        results.Single().StatusCode.ShouldNotBe(FocasStatusMapper.BadNotWritable);
    }

    [Fact]
    public void Dto_round_trip_preserves_both_granular_flags()
    {
        // Both flags must round-trip independently — a deployment that opts into
        // PARAM only doesn't accidentally let MACRO writes through, and vice versa.
        const string json = """
        {
          "Backend": "unimplemented",
          "Devices": [{ "HostAddress": "focas://10.0.0.5:8193" }],
          "Writes": { "Enabled": true, "AllowParameter": true, "AllowMacro": true }
        }
        """;

        var drv = FocasDriverFactoryExtensions.CreateInstance("drv-1", json);
        drv.InitializeAsync("{}", CancellationToken.None).GetAwaiter().GetResult();

        // Both gates open: the driver no longer rejects either kind at the granular
        // gate. Submit one of each and confirm neither maps to BadNotWritable
        // (BadNodeIdUnknown when the tag isn't configured is fine — what matters is
        // we stayed past the per-kind gate).
        var results = drv.WriteAsync(
        [
            new WriteRequest("ParamUnknown", 0),
            new WriteRequest("MacroUnknown", 0),
        ], CancellationToken.None).GetAwaiter().GetResult();

        // Both writes hit BadNodeIdUnknown (tag-lookup fails) rather than the
        // BadNotWritable short-circuit — confirms both flags reached the driver.
        results.Count.ShouldBe(2);
        results[0].StatusCode.ShouldBe(FocasStatusMapper.BadNodeIdUnknown);
        results[1].StatusCode.ShouldBe(FocasStatusMapper.BadNodeIdUnknown);
    }

    [Fact]
    public async Task Per_kind_gate_does_not_affect_PMC_writes()
    {
        // Defense in depth: AllowParameter / AllowMacro stay locked but PMC writes
        // (which already worked in F4-a) keep flowing through Writes.Enabled +
        // per-tag Writable. This guards against regressing the F4-a surface.
        var drv = NewDriver(
            writes: new FocasWritesOptions
            {
                Enabled = true,
                AllowParameter = false,
                AllowMacro = false,
            },
            tags:
            [
                new FocasTagDefinition("R100", Host, "R100", FocasDataType.Byte, Writable: true),
            ],
            out var factory);
        await drv.InitializeAsync("{}", CancellationToken.None);

        var results = await drv.WriteAsync(
            [new WriteRequest("R100", (sbyte)1)], CancellationToken.None);

        results.Single().StatusCode.ShouldBe(FocasStatusMapper.Good);
        // PMC routes through the generic WriteAsync, not the typed entry points.
        factory.Clients[0].WriteLog.Count.ShouldBe(1);
        factory.Clients[0].ParameterWriteLog.ShouldBeEmpty();
        factory.Clients[0].MacroWriteLog.ShouldBeEmpty();
    }
}