using Microsoft.Extensions.Logging.Abstractions;
using Moq;
using ScadaLink.Commons.Entities.Audit;
using ScadaLink.Commons.Interfaces.Services;
using ScadaLink.Commons.Messages.Integration;
using ScadaLink.Commons.Types;
using ScadaLink.Commons.Types.Enums;
using ScadaLink.SiteRuntime.Scripts;

namespace ScadaLink.SiteRuntime.Tests.Scripts;

/// <summary>
/// Audit Log #23 — M3 Bundle E (Task E6): every script-initiated
/// <c>Database.CachedWrite</c> emits exactly one <c>CachedSubmit</c>
/// combined-telemetry packet at enqueue time on the <c>DbOutbound</c>
/// channel, returns a fresh <see cref="TrackedOperationId"/>, and threads
/// the id into the database gateway so the store-and-forward retry loop can
/// emit per-attempt + terminal telemetry under the same id.
/// </summary>
public class DatabaseCachedWriteEmissionTests
{
    private sealed class CapturingForwarder : ICachedCallTelemetryForwarder
    {
        public List<CachedCallTelemetry> Telemetry { get; } = new();
        public Exception? ThrowOnForward { get; set; }

        public Task ForwardAsync(CachedCallTelemetry telemetry, CancellationToken ct = default)
        {
            if (ThrowOnForward != null)
            {
                return Task.FromException(ThrowOnForward);
            }
            Telemetry.Add(telemetry);
            return Task.CompletedTask;
        }
    }

    private const string SiteId = "site-77";
    private const string InstanceName = "Plant.Pump42";
    private const string SourceScript = "ScriptActor:WriteAudit";

    private static ScriptRuntimeContext.DatabaseHelper CreateHelper(
        IDatabaseGateway gateway,
        ICachedCallTelemetryForwarder? forwarder)
    {
        return new ScriptRuntimeContext.DatabaseHelper(
            gateway,
            InstanceName,
            NullLogger.Instance,
            // Audit Log #23: execution-wide correlation id. Cached rows keep
            // CorrelationId = TrackedOperationId, so any value works here.
            Guid.NewGuid(),
            siteId: SiteId,
            sourceScript: SourceScript,
            cachedForwarder: forwarder);
    }

    [Fact]
    public async Task CachedWrite_EmitsSubmitTelemetry_OnEnqueue_KindCachedSubmit_ChannelDbOutbound()
    {
        var gateway = new Mock<IDatabaseGateway>();
        gateway
            .Setup(g => g.CachedWriteAsync(
                "myDb", "INSERT INTO t VALUES (1)",
                It.IsAny<IReadOnlyDictionary<string, object?>?>(),
                InstanceName,
                It.IsAny<CancellationToken>(),
                It.IsAny<TrackedOperationId?>()))
            .Returns(Task.CompletedTask);
        var forwarder = new CapturingForwarder();

        var helper = CreateHelper(gateway.Object, forwarder);
        var trackedId = await helper.CachedWrite("myDb", "INSERT INTO t VALUES (1)");

        Assert.NotEqual(default, trackedId);
        var packet = Assert.Single(forwarder.Telemetry);

        Assert.Equal(AuditChannel.DbOutbound, packet.Audit.Channel);
        Assert.Equal(AuditKind.CachedSubmit, packet.Audit.Kind);
        Assert.Equal(AuditStatus.Submitted, packet.Audit.Status);
        Assert.Equal("myDb", packet.Audit.Target);
        Assert.Equal(trackedId.Value, packet.Audit.CorrelationId);

        Assert.Equal(trackedId, packet.Operational.TrackedOperationId);
        Assert.Equal("DbOutbound", packet.Operational.Channel);
        Assert.Equal("myDb", packet.Operational.Target);
        Assert.Equal(SiteId, packet.Operational.SourceSite);
        Assert.Equal("Submitted", packet.Operational.Status);
        Assert.Equal(0, packet.Operational.RetryCount);
        Assert.Null(packet.Operational.TerminalAtUtc);
    }

    [Fact]
    public async Task CachedWrite_ProvenancePopulated()
    {
        var gateway = new Mock<IDatabaseGateway>();
        gateway
            .Setup(g => g.CachedWriteAsync(
                It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<IReadOnlyDictionary<string, object?>?>(),
                It.IsAny<string?>(),
                It.IsAny<CancellationToken>(),
                It.IsAny<TrackedOperationId?>()))
            .Returns(Task.CompletedTask);
        var forwarder = new CapturingForwarder();

        var helper = CreateHelper(gateway.Object, forwarder);
        await helper.CachedWrite("myDb", "INSERT INTO t VALUES (1)");

        var packet = Assert.Single(forwarder.Telemetry);
        Assert.Equal(SiteId, packet.Audit.SourceSiteId);
        Assert.Equal(InstanceName, packet.Audit.SourceInstanceId);
        Assert.Equal(SourceScript, packet.Audit.SourceScript);
        Assert.Equal(SiteId, packet.Operational.SourceSite);
    }

    [Fact]
    public async Task CachedWrite_ReturnsTrackedOperationId_ThreadsIdToGateway()
    {
        var gateway = new Mock<IDatabaseGateway>();
        gateway
            .Setup(g => g.CachedWriteAsync(
                It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<IReadOnlyDictionary<string, object?>?>(),
                It.IsAny<string?>(),
                It.IsAny<CancellationToken>(),
                It.IsAny<TrackedOperationId?>()))
            .Returns(Task.CompletedTask);
        var forwarder = new CapturingForwarder();

        var helper = CreateHelper(gateway.Object, forwarder);
        var trackedId = await helper.CachedWrite("myDb", "INSERT INTO t VALUES (1)");

        Assert.NotEqual(default, trackedId);
        gateway.Verify(g => g.CachedWriteAsync(
            "myDb", "INSERT INTO t VALUES (1)",
            It.IsAny<IReadOnlyDictionary<string, object?>?>(),
            InstanceName,
            It.IsAny<CancellationToken>(),
            trackedId),
            Times.Once);
    }

    [Fact]
    public async Task CachedWrite_ForwarderThrows_StillReturnsTrackedOperationId()
    {
        var gateway = new Mock<IDatabaseGateway>();
        gateway
            .Setup(g => g.CachedWriteAsync(
                It.IsAny<string>(), It.IsAny<string>(),
                It.IsAny<IReadOnlyDictionary<string, object?>?>(),
                It.IsAny<string?>(),
                It.IsAny<CancellationToken>(),
                It.IsAny<TrackedOperationId?>()))
            .Returns(Task.CompletedTask);
        var forwarder = new CapturingForwarder
        {
            ThrowOnForward = new InvalidOperationException("simulated forwarder outage"),
        };

        var helper = CreateHelper(gateway.Object, forwarder);
        var trackedId = await helper.CachedWrite("myDb", "INSERT INTO t VALUES (1)");

        Assert.NotEqual(default, trackedId);
        gateway.Verify(g => g.CachedWriteAsync(
            "myDb", "INSERT INTO t VALUES (1)",
            It.IsAny<IReadOnlyDictionary<string, object?>?>(),
            InstanceName,
            It.IsAny<CancellationToken>(),
            trackedId),
            Times.Once);
    }
}