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

namespace Omika.Diagnostics.Tests;

/// <summary>
/// Suppression d'un groupe d'erreurs complet (bouton « Supprimer le groupe » /Erreurs).
/// Le repository supprime TOUTES les occurrences d'un groupe (aucune borne de période),
/// restreintes aux niveaux d'erreur réels. Tests sur <see cref="FakeDiagnosticEventRepository"/> ;
/// la production exécute la même sémantique via <c>IS NOT DISTINCT FROM</c> + prédicat
/// d'erreur réel.
/// </summary>
public class DiagnosticErrorGroupDeleteTests
{
    private static DiagnosticEventRecord Ev(
        string eventCode = "ERR",
        DateTimeOffset? ts = null,
        string? errorCode = null,
        string? exceptionType = null,
        string? component = null,
        string level = "Error") =>
        new()
        {
            EventId = Guid.NewGuid(),
            EventCode = eventCode,
            TimestampUtc = ts ?? DateTimeOffset.UtcNow,
            ErrorCode = errorCode,
            ExceptionType = exceptionType,
            Component = component,
            Level = level,
            Priority = "P2",
            Source = DiagnosticSources.Mobile,
            IngestedAtUtc = DateTimeOffset.UtcNow
        };

    /// <summary>
    /// Identité de groupe aux clés NORMALISÉES (même normalisation que
    /// <see cref="DiagnosticErrorGroupLink.TryDecode"/>, qui re-normalise à la réception).
    /// </summary>
    private static DiagnosticErrorGroupIdentity Identity(
        string eventCode = "ERR",
        string? errorCode = null,
        string? exceptionType = null,
        string? component = null) =>
        new(eventCode,
            DiagnosticErrorGrouping.NormalizeKey(errorCode),
            DiagnosticErrorGrouping.NormalizeKey(exceptionType),
            DiagnosticErrorGrouping.NormalizeKey(component));

    // --------------------------------------- D1 : supprime tout le groupe ----
    [Fact]
    public async Task DeleteErrorGroup_RemovesAllOccurrences()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", exceptionType: "System.TimeoutException"),
            Ev("ERR", exceptionType: "System.TimeoutException"),
            Ev("ERR", exceptionType: "System.TimeoutException")
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "system.timeoutexception"));

        Assert.Equal(3, deleted);
        DiagnosticQueryResult<DiagnosticEventRecord> remaining =
            await repo.QueryAsync(new DiagnosticEventQuery { PageSize = 10 });
        Assert.Equal(0, remaining.TotalCount);
    }

    // ------------------------------- D2 : aucune borne de période (tout le groupe) ----
    [Fact]
    public async Task DeleteErrorGroup_NoPeriodBound_RemovesAncientAndRecent()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", DateTimeOffset.UtcNow.AddYears(-2), exceptionType: "System.Exception"),
            Ev("ERR", DateTimeOffset.UtcNow, exceptionType: "System.Exception")
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "system.exception"));

        Assert.Equal(2, deleted);
    }

    // ------------------------------- D3 : casse/espaces → même groupe ----
    [Fact]
    public async Task DeleteErrorGroup_NormalizesKeys()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", exceptionType: "System.TimeoutException", component: "Omika.Api"),
            Ev("ERR", exceptionType: "system.timeoutexception", component: "  omika.api  ")
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "SYSTEM.TIMEOUTEXCEPTION", component: "OMIKA.API"));

        Assert.Equal(2, deleted);
    }

    // ------------------------------- D4 : NULL ErrorCode → retrouvé ----
    [Fact]
    public async Task DeleteErrorGroup_NullErrorCode_IsMatched()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", errorCode: null),
            Ev("ERR", errorCode: string.Empty),
            Ev("ERR", errorCode: "   ")
        });

        long deleted = await repo.DeleteErrorGroupAsync(Identity(errorCode: null));

        Assert.Equal(3, deleted); // null / '' / espaces → tous normalisés en NULL
    }

    // ------------------------------- D5 : autre EventCode → exclu ----
    [Fact]
    public async Task DeleteErrorGroup_DifferentEventCode_IsExcluded()
    {
        var repo = new FakeDiagnosticEventRepository();
        DiagnosticEventRecord keep = Ev("OTHER", exceptionType: "System.Exception");
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", exceptionType: "System.Exception"),
            keep
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(eventCode: "ERR", exceptionType: "system.exception"));

        Assert.Equal(1, deleted);
        DiagnosticQueryResult<DiagnosticEventRecord> remaining =
            await repo.QueryAsync(new DiagnosticEventQuery { PageSize = 10 });
        DiagnosticEventRecord item = Assert.Single(remaining.Items);
        Assert.Equal(keep.EventId, item.EventId);
    }

    // ------------------------------- D6 : non-erreur de même signature → conservé ----
    [Fact]
    public async Task DeleteErrorGroup_NonErrorSameSignature_IsKept()
    {
        var repo = new FakeDiagnosticEventRepository();
        DiagnosticEventRecord info = Ev("ERR", exceptionType: "System.Exception", level: "info");
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", exceptionType: "System.Exception", level: "error"),
            info
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "system.exception"));

        Assert.Equal(1, deleted);
        DiagnosticQueryResult<DiagnosticEventRecord> remaining =
            await repo.QueryAsync(new DiagnosticEventQuery { PageSize = 10 });
        DiagnosticEventRecord item = Assert.Single(remaining.Items);
        Assert.Equal(info.EventId, item.EventId);
    }

    // ------------------------------- D7 : groupe inexistant → 0 ----
    [Fact]
    public async Task DeleteErrorGroup_Nonexistent_ReturnsZero()
    {
        var repo = new FakeDiagnosticEventRepository();
        await repo.InsertBatchAsync(new[] { Ev("ERR", exceptionType: "System.Exception") });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "system.nullreferenceexception"));

        Assert.Equal(0, deleted);
        DiagnosticQueryResult<DiagnosticEventRecord> remaining =
            await repo.QueryAsync(new DiagnosticEventQuery { PageSize = 10 });
        Assert.Equal(1, remaining.TotalCount);
    }

    // ------------------------------- D8 : table vide → 0 ----
    [Fact]
    public async Task DeleteErrorGroup_EmptyTable_ReturnsZero()
    {
        var repo = new FakeDiagnosticEventRepository();
        long deleted = await repo.DeleteErrorGroupAsync(Identity(exceptionType: "system.exception"));
        Assert.Equal(0, deleted);
    }

    // ------------------------------- D9 : ne supprime pas les autres groupes ----
    [Fact]
    public async Task DeleteErrorGroup_LeavesOtherGroups()
    {
        var repo = new FakeDiagnosticEventRepository();
        DiagnosticEventRecord other = Ev("ERR", exceptionType: "System.NullReferenceException");
        await repo.InsertBatchAsync(new[]
        {
            Ev("ERR", exceptionType: "System.TimeoutException"),
            other
        });

        long deleted = await repo.DeleteErrorGroupAsync(
            Identity(exceptionType: "system.timeoutexception"));

        Assert.Equal(1, deleted);
        DiagnosticQueryResult<DiagnosticEventRecord> remaining =
            await repo.QueryAsync(new DiagnosticEventQuery { PageSize = 10 });
        DiagnosticEventRecord item = Assert.Single(remaining.Items);
        Assert.Equal(other.EventId, item.EventId);
    }
}