using Akka.TestKit.Xunit2;
using Microsoft.EntityFrameworkCore;
using ScadaLink.AuditLog.Tests.Integration.Infrastructure;
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.ConfigurationDatabase.Tests.Migrations;

namespace ScadaLink.AuditLog.Tests.Integration;

/// <summary>
/// Bundle G G3 mirror of <see cref="CachedCallCombinedTelemetryTests"/> for
/// <c>Database.CachedWrite</c>. Same pipeline composition, same dual-write
/// transaction, but the lifecycle bridge maps channel <c>"DbOutbound"</c> to
/// <see cref="AuditKind.DbWriteCached"/> on the per-attempt audit row (vs.
/// <see cref="AuditKind.ApiCallCached"/> for API calls). The
/// <see cref="AuditChannel"/> on the audit row, the <c>SiteCalls.Channel</c>
/// column, and the per-attempt <see cref="AuditKind"/> all need to come
/// through as the DB variants for this path to be considered exercised.
/// </summary>
/// <remarks>
/// As with G2, the bridge is driven directly via the harness — we do not
/// stand up a real <c>Database.CachedWrite</c> caller. The site-side
/// unit-level emission for the DB path is exercised in
/// <c>ScadaLink.SiteRuntime.Tests</c>; this suite verifies the end-to-end
/// combined-telemetry path produces the right central rows.
/// </remarks>
public class CachedWriteCombinedTelemetryTests : TestKit, IClassFixture<MsSqlMigrationFixture>
{
    private readonly MsSqlMigrationFixture _fixture;

    public CachedWriteCombinedTelemetryTests(MsSqlMigrationFixture fixture)
    {
        _fixture = fixture;
    }

    private static string NewSiteId() =>
        "test-g3-cachedwrite-" + Guid.NewGuid().ToString("N").Substring(0, 8);

    private static CachedCallTelemetry DbSubmitPacket(
        TrackedOperationId id, string siteId, DateTime nowUtc, string target = "OperationsDb.UpdateOrder") =>
        new(
            Audit: new AuditEvent
            {
                EventId = Guid.NewGuid(),
                OccurredAtUtc = nowUtc,
                Channel = AuditChannel.DbOutbound,
                Kind = AuditKind.CachedSubmit,
                CorrelationId = id.Value,
                SourceSiteId = siteId,
                SourceInstanceId = "Plant.Pump42",
                SourceScript = "ScriptActor:doStuff",
                Target = target,
                Status = AuditStatus.Submitted,
                ForwardState = AuditForwardState.Pending,
            },
            Operational: new SiteCallOperational(
                TrackedOperationId: id,
                Channel: "DbOutbound",
                Target: target,
                SourceSite: siteId,
                Status: "Submitted",
                RetryCount: 0,
                LastError: null,
                HttpStatus: null,
                CreatedAtUtc: nowUtc,
                UpdatedAtUtc: nowUtc,
                TerminalAtUtc: null));

    private static CachedCallAttemptContext DbAttemptContext(
        TrackedOperationId id,
        string siteId,
        CachedCallAttemptOutcome outcome,
        int retryCount,
        string? lastError,
        DateTime createdUtc,
        DateTime occurredUtc,
        string target = "OperationsDb.UpdateOrder") =>
        new(
            TrackedOperationId: id,
            Channel: "DbOutbound",
            Target: target,
            SourceSite: siteId,
            Outcome: outcome,
            RetryCount: retryCount,
            LastError: lastError,
            HttpStatus: null,
            CreatedAtUtc: createdUtc,
            OccurredAtUtc: occurredUtc,
            DurationMs: 12,
            SourceInstanceId: "Plant.Pump42");

    [SkippableFact]
    public async Task CachedWrite_Success_Emits_Delivered_Lifecycle()
    {
        Skip.IfNot(_fixture.Available, _fixture.SkipReason);

        var siteId = NewSiteId();
        var trackedId = TrackedOperationId.New();
        var t0 = new DateTime(2026, 5, 20, 13, 0, 0, DateTimeKind.Utc);

        await using var harness = new CombinedTelemetryHarness(_fixture, this);

        // Submit + immediate delivered attempt.
        await harness.EmitSubmitAsync(DbSubmitPacket(trackedId, siteId, t0));
        await harness.EmitAttemptAsync(DbAttemptContext(
            trackedId, siteId,
            CachedCallAttemptOutcome.Delivered,
            retryCount: 0, lastError: null,
            createdUtc: t0, occurredUtc: t0.AddMilliseconds(50)));

        await using var read = harness.CreateReadContext();

        // Central SiteCalls row — DbOutbound channel, Delivered.
        var siteCall = await read.Set<SiteCall>()
            .SingleAsync(s => s.TrackedOperationId == trackedId);
        Assert.Equal("DbOutbound", siteCall.Channel);
        Assert.Equal("Delivered", siteCall.Status);
        Assert.Equal(0, siteCall.RetryCount);
        Assert.NotNull(siteCall.TerminalAtUtc);

        var auditRows = await read.Set<AuditEvent>()
            .Where(e => e.SourceSiteId == siteId)
            .ToListAsync();
        Assert.Equal(3, auditRows.Count);
        // Submit row: CachedSubmit + DbOutbound channel.
        var submit = Assert.Single(auditRows, r => r.Kind == AuditKind.CachedSubmit);
        Assert.Equal(AuditChannel.DbOutbound, submit.Channel);
        // Per-attempt row: DbWriteCached (NOT ApiCallCached).
        var attempt = Assert.Single(auditRows, r => r.Kind == AuditKind.DbWriteCached);
        Assert.Equal(AuditStatus.Attempted, attempt.Status);
        Assert.Equal(AuditChannel.DbOutbound, attempt.Channel);
        // Terminal: CachedResolve Delivered.
        var resolve = Assert.Single(auditRows, r => r.Kind == AuditKind.CachedResolve);
        Assert.Equal(AuditStatus.Delivered, resolve.Status);
        Assert.Equal(AuditChannel.DbOutbound, resolve.Channel);

        // Site-local tracking row mirrors the same outcome.
        var snapshot = await harness.TrackingStore.GetStatusAsync(trackedId);
        Assert.NotNull(snapshot);
        Assert.Equal("Delivered", snapshot!.Status);
    }

    [SkippableFact]
    public async Task CachedWrite_Parked_Emits_Terminal_Parked()
    {
        Skip.IfNot(_fixture.Available, _fixture.SkipReason);

        var siteId = NewSiteId();
        var trackedId = TrackedOperationId.New();
        var t0 = new DateTime(2026, 5, 20, 14, 0, 0, DateTimeKind.Utc);

        await using var harness = new CombinedTelemetryHarness(_fixture, this);

        await harness.EmitSubmitAsync(DbSubmitPacket(trackedId, siteId, t0));

        // Two transient SQL-error attempts...
        for (int i = 1; i <= 2; i++)
        {
            await harness.EmitAttemptAsync(DbAttemptContext(
                trackedId, siteId,
                CachedCallAttemptOutcome.TransientFailure,
                retryCount: i, lastError: "Deadlock victim",
                createdUtc: t0, occurredUtc: t0.AddSeconds(i * 5)));
        }

        // ...then permanent failure → Parked terminal.
        await harness.EmitAttemptAsync(DbAttemptContext(
            trackedId, siteId,
            CachedCallAttemptOutcome.PermanentFailure,
            retryCount: 3, lastError: "ConstraintViolation: FK_Orders_Customer",
            createdUtc: t0, occurredUtc: t0.AddSeconds(20)));

        await using var read = harness.CreateReadContext();

        var siteCall = await read.Set<SiteCall>()
            .SingleAsync(s => s.TrackedOperationId == trackedId);
        Assert.Equal("DbOutbound", siteCall.Channel);
        Assert.Equal("Parked", siteCall.Status);
        Assert.NotNull(siteCall.TerminalAtUtc);

        var resolve = await read.Set<AuditEvent>()
            .Where(e => e.SourceSiteId == siteId && e.Kind == AuditKind.CachedResolve)
            .SingleAsync();
        Assert.Equal(AuditStatus.Parked, resolve.Status);
        Assert.Equal(AuditChannel.DbOutbound, resolve.Channel);

        // Tracking store mirrors Parked.
        var snapshot = await harness.TrackingStore.GetStatusAsync(trackedId);
        Assert.NotNull(snapshot);
        Assert.Equal("Parked", snapshot!.Status);
        Assert.NotNull(snapshot.TerminalAtUtc);
    }
}