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

namespace Omika.Diagnostics.Tests;

/// <summary>
/// Tâche 4 (extension) — Séries par client et classement des licences en erreur.
/// Contrats couverts : <c>CountByTimeBucketAndClientAsync</c> (répartition par client,
/// NULL/vides regroupés, ErrorsOnly) et <c>CountLicensesByErrorsAsync</c> (classement
/// par nombre d'erreurs, licences manquantes exclues, limite). Tests sur le
/// <see cref="FakeDiagnosticEventRepository"/> (in-memory) ; l'implémentation PostgreSQL
/// exécute les mêmes contrats via <c>GROUP BY date_trunc(...), NULLIF(TRIM(client_code),'')</c>
/// et <c>GROUP BY NULLIF(TRIM(license_number),'')</c>.
/// </summary>
public class DiagnosticClientSeriesTests
{
    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(
        DateTimeOffset? ts = null,
        string? clientCode = null,
        string? licenseNumber = null,
        string level = "Info") =>
        new()
        {
            EventId = Guid.NewGuid(),
            EventCode = "TEST",
            TimestampUtc = ts ?? From.AddMinutes(1),
            ClientCode = clientCode,
            LicenseNumber = licenseNumber,
            Level = level,
            Priority = "P2",
            Source = DiagnosticSources.Mobile,
            IngestedAtUtc = DateTimeOffset.UtcNow
        };

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

    // --------------------------------------------- série par client : répartition ----
    [Fact]
    public async Task CountByTimeBucketAndClient_SplitsByClient()
    {
        var repo = new FakeDiagnosticEventRepository();
        var t = new DateTimeOffset(2025, 1, 1, 10, 0, 0, TimeSpan.Zero);
        await repo.InsertBatchAsync(new[]
        {
            Ev(t, clientCode: "BATIK.01"),
            Ev(t.AddMinutes(5), clientCode: "BATIK.01"),
            Ev(t.AddMinutes(10), clientCode: "AUTRE.02")
        });

        IReadOnlyList<DiagnosticBucketClientCount> result = await repo.CountByTimeBucketAndClientAsync(
            DiagnosticTimeBucket.Hour, All());

        Assert.Equal(2, result.Count);
        Assert.All(result, r => Assert.Equal(new DateTimeOffset(2025, 1, 1, 10, 0, 0, TimeSpan.Zero), r.BucketUtc));
        Assert.Contains(result, r => r.ClientCode == "BATIK.01" && r.Count == 2);
        Assert.Contains(result, r => r.ClientCode == "AUTRE.02" && r.Count == 1);
    }

    // ---------------------------------------- série par client : client manquant ----
    [Fact]
    public async Task CountByTimeBucketAndClient_NullAndBlankClients_GroupedUnderNull()
    {
        var repo = new FakeDiagnosticEventRepository();
        var t = new DateTimeOffset(2025, 1, 1, 10, 0, 0, TimeSpan.Zero);
        await repo.InsertBatchAsync(new[]
        {
            Ev(t, clientCode: null),
            Ev(t.AddMinutes(5), clientCode: "   "), // espaces → groupe « non identifié »
            Ev(t.AddMinutes(10), clientCode: "BATIK.01")
        });

        IReadOnlyList<DiagnosticBucketClientCount> result = await repo.CountByTimeBucketAndClientAsync(
            DiagnosticTimeBucket.Hour, All());

        Assert.Equal(2, result.Count);
        Assert.Contains(result, r => r.ClientCode is null && r.Count == 2);
        Assert.Contains(result, r => r.ClientCode == "BATIK.01" && r.Count == 1);
    }

    // ------------------------------------------- série par client : ErrorsOnly ----
    [Fact]
    public async Task CountByTimeBucketAndClient_ErrorsOnly_OnlyErrorLevels()
    {
        var repo = new FakeDiagnosticEventRepository();
        var t = new DateTimeOffset(2025, 1, 1, 10, 0, 0, TimeSpan.Zero);
        await repo.InsertBatchAsync(new[]
        {
            Ev(t, clientCode: "A", level: "Error"),
            Ev(t.AddMinutes(5), clientCode: "A", level: "Info"),
            Ev(t.AddMinutes(10), clientCode: "B", level: "critical")
        });

        IReadOnlyList<DiagnosticBucketClientCount> result = await repo.CountByTimeBucketAndClientAsync(
            DiagnosticTimeBucket.Hour,
            new DiagnosticAggregateQuery { FromUtc = From, ToUtc = To, ErrorsOnly = true });

        Assert.Equal(2, result.Count);
        Assert.Contains(result, r => r.ClientCode == "A" && r.Count == 1);
        Assert.Contains(result, r => r.ClientCode == "B" && r.Count == 1);
    }

    // ------------------------------------------ licences en erreur : classement ----
    [Fact]
    public async Task CountLicensesByErrors_RanksByErrorCount()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev(From.AddMinutes(1), licenseNumber: "L-1", level: "Error"),
            Ev(From.AddMinutes(2), licenseNumber: "L-1", level: "Critical"),
            Ev(From.AddMinutes(3), licenseNumber: "L-2", level: "Error"),
            Ev(From.AddMinutes(4), licenseNumber: "L-1", level: "Info"), // non-erreur → exclu
            Ev(From.AddMinutes(5), licenseNumber: "L-2", level: "Info")
        });

        IReadOnlyList<DiagnosticLicenseErrorCount> result = await repo.CountLicensesByErrorsAsync(All());

        Assert.Equal(2, result.Count);
        Assert.Equal("L-1", result[0].LicenseNumber);
        Assert.Equal(2, result[0].ErrorCount);
        Assert.Equal("L-2", result[1].LicenseNumber);
        Assert.Equal(1, result[1].ErrorCount);
    }

    // ----------------------------------- licences en erreur : licences manquantes ----
    [Fact]
    public async Task CountLicensesByErrors_ExcludesMissingLicenses()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev(From.AddMinutes(1), licenseNumber: null, level: "Error"),
            Ev(From.AddMinutes(2), licenseNumber: "   ", level: "Error"),
            Ev(From.AddMinutes(3), licenseNumber: "L-1", level: "Error")
        });

        IReadOnlyList<DiagnosticLicenseErrorCount> result = await repo.CountLicensesByErrorsAsync(All());

        DiagnosticLicenseErrorCount row = Assert.Single(result);
        Assert.Equal("L-1", row.LicenseNumber);
        Assert.Equal(1, row.ErrorCount);
    }

    // ------------------------------------------- licences en erreur : limite ----
    [Fact]
    public async Task CountLicensesByErrors_RespectsLimit()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev(From.AddMinutes(1), licenseNumber: "L-1", level: "Error"),
            Ev(From.AddMinutes(2), licenseNumber: "L-2", level: "Error"),
            Ev(From.AddMinutes(3), licenseNumber: "L-2", level: "Error"),
            Ev(From.AddMinutes(4), licenseNumber: "L-3", level: "Error")
        });

        IReadOnlyList<DiagnosticLicenseErrorCount> result = await repo.CountLicensesByErrorsAsync(
            new DiagnosticAggregateQuery { FromUtc = From, ToUtc = To, Limit = 2 });

        Assert.Equal(2, result.Count);
        Assert.Equal("L-2", result[0].LicenseNumber);
        Assert.Equal("L-1", result[1].LicenseNumber); // ex-aequo 1 erreur : ordre alphabétique
    }
}