using Omika.Diagnostics.Models;
using Omika.Diagnostics.Queries;
using Omika.Diagnostics.Tests.Fakes;

namespace Omika.Diagnostics.Tests;

/// <summary>
/// Tâche 8 — Synchronisation : résumé sync et filtres par liste fermée d'EventCodes.
/// Tests sur <see cref="FakeDiagnosticEventRepository"/> ; la production exécute la même
/// sémantique via COUNT/COUNT(DISTINCT)/FILTER/AVG côté PostgreSQL.
/// </summary>
public class DiagnosticSyncTests
{
    private static readonly DateTimeOffset From = new(2025, 1, 1, 0, 0, 0, TimeSpan.Zero);
    private static readonly DateTimeOffset To = new(2025, 2, 1, 0, 0, 0, TimeSpan.Zero);

    private static DiagnosticEventRecord Ev(
        string eventCode,
        DateTimeOffset? ts = null,
        Guid? operationId = null,
        string level = "Info",
        long? durationMs = null) =>
        new()
        {
            EventId = Guid.NewGuid(),
            EventCode = eventCode,
            TimestampUtc = ts ?? From.AddMinutes(1),
            OperationId = operationId,
            Level = level,
            Priority = "P2",
            DurationMs = durationMs,
            Source = DiagnosticSources.Mobile,
            IngestedAtUtc = DateTimeOffset.UtcNow
        };

    private static DiagnosticAggregateQuery All() => new() { FromUtc = From, ToUtc = To };

    // ------------------------------------------------- S1 : summary multi ----
    [Fact]
    public async Task GetSyncSummary_MultipleEvents_ReturnsSummary()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001", operationId: Guid.NewGuid()),
            Ev("OMK-WKR-SYNC-001", operationId: Guid.NewGuid())
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(2, summary.EventCount);
    }

    // ------------------------------------------------- S2 : EventCount ----
    [Fact]
    public async Task GetSyncSummary_EventCount_CountsOnlySync()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001"),
            Ev("OMK-WKR-SYNC-001"),
            Ev("NOT-SYNC")
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(2, summary.EventCount);
    }

    // ------------------------------------------------- S3 : OperationCount distinct ----
    [Fact]
    public async Task GetSyncSummary_OperationCount_IsDistinct()
    {
        Guid opA = Guid.NewGuid();
        Guid opB = Guid.NewGuid();
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001", operationId: opA),
            Ev("OMK-MOB-SYNC-001", operationId: opA), // même opération
            Ev("OMK-WKR-SYNC-001", operationId: opB)
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(2, summary.OperationCount);
    }

    // ------------------------------------------------- S4 : OperationId null exclu ----
    [Fact]
    public async Task GetSyncSummary_NullOperationId_NotCounted()
    {
        Guid opA = Guid.NewGuid();
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001", operationId: opA),
            Ev("OMK-MOB-SYNC-001", operationId: null) // sans OperationId
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(1, summary.OperationCount);
        Assert.Equal(2, summary.EventCount); // l'événement sans OperationId reste compté
    }

    // ------------------------------------------------- S5 : ErrorCount casse mixte ----
    [Fact]
    public async Task GetSyncSummary_ErrorCount_MixedCase()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-WKR-SYNC-002", level: "Error"),
            Ev("OMK-WKR-SYNC-002", level: "error"),
            Ev("OMK-WKR-SYNC-002", level: "Critical"),
            Ev("OMK-WKR-SYNC-001", level: "Info")
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(3, summary.ErrorCount);
    }

    // ------------------------------------------------- S6 : durée avg/min/max ----
    [Fact]
    public async Task GetSyncSummary_DurationStats_AreCorrect()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-WKR-SYNC-001", durationMs: 100),
            Ev("OMK-WKR-SYNC-001", durationMs: 300)
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(2, summary.DurationCount);
        Assert.Equal(200, summary.AverageMs);
        Assert.Equal(100, summary.MinMs);
        Assert.Equal(300, summary.MaxMs);
    }

    // ------------------------------------------------- S7 : durée NULL ignorée ----
    [Fact]
    public async Task GetSyncSummary_NullDurations_Ignored()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-WKR-SYNC-001", durationMs: 100),
            Ev("OMK-WKR-SYNC-001", durationMs: null)
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(1, summary.DurationCount);
        Assert.Equal(100, summary.AverageMs);
    }

    [Fact]
    public async Task GetSyncSummary_NoDurations_NullStats()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001", durationMs: null)
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(0, summary.DurationCount);
        Assert.Null(summary.AverageMs);
        Assert.Null(summary.MinMs);
        Assert.Null(summary.MaxMs);
    }

    // ------------------------------------------------- S8 : période ----
    [Fact]
    public async Task GetSyncSummary_RespectsPeriod()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001", From.AddMinutes(-5)), // avant
            Ev("OMK-MOB-SYNC-001", From.AddMinutes(5)), // dans
            Ev("OMK-MOB-SYNC-001", To.AddMinutes(5))    // après
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(1, summary.EventCount);
    }

    // ------------------------------------------------- S9 : non-sync exclu ----
    [Fact]
    public async Task GetSyncSummary_NonSyncExcluded()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001"),
            Ev("OMK-MOB-APP-001") // non-sync
        });

        DiagnosticSyncSummary summary = await repo.GetSyncSummaryAsync(All());

        Assert.Equal(1, summary.EventCount);
    }

    // ------------------------------------------------- S10 : reconnaissance ----
    [Theory]
    [InlineData("OMK-MOB-SYNC-001", true)]
    [InlineData("OMK-WKR-SYNC-001", true)]
    [InlineData("OMK-WKR-SYNC-002", true)]
    [InlineData("OMK-MOB-APP-001", false)]
    [InlineData(null, false)]
    public void SyncEventCodes_Recognition(string? code, bool expected)
    {
        Assert.Equal(expected, DiagnosticSyncEventCodes.IsSyncEventCode(code));
    }

    // ------------------------------------------------- S11 : distribution EventCode ----
    [Fact]
    public async Task CountGrouped_EventCode_SyncOnly_ReturnsOnlySyncCodes()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("OMK-MOB-SYNC-001"),
            Ev("OMK-MOB-SYNC-001"),
            Ev("OMK-WKR-SYNC-001"),
            Ev("OMK-MOB-APP-001") // non-sync → exclu
        });

        IReadOnlyList<DiagnosticGroupCount> result = await repo.CountGroupedAsync(
            DiagnosticGroupDimension.EventCode,
            new DiagnosticAggregateQuery { FromUtc = From, ToUtc = To, SyncOnly = true });

        Assert.Equal(2, result.Count);
        Assert.DoesNotContain(result, g => g.Key == "OMK-MOB-APP-001");
        Assert.Contains(result, g => g.Key == "OMK-MOB-SYNC-001" && g.Count == 2);
    }
}