using Deal.Telegram.Dialogs;

namespace Deal.Telegram.Tests.Telegram;

/// <summary>
/// Unit-тесты зеркала каталога/мониторинга диалогов.
/// </summary>
public sealed class DialogCatalogTests
{
    private const string TenantA = "tenant-a";
    private const string TenantB = "tenant-b";
    private const string ChannelId = "-1001234567890";
    private const string GroupId = "-456789";
    private const string UserId = "+12345";

    /// <summary>
    /// SetMonitored включает/выключает диалог; IsMonitored повторяет решение.
    /// </summary>
    [Fact]
    public void SetMonitored_TogglesDialog()
    {
        var catalog = new DialogCatalog();

        Assert.False(catalog.IsMonitored(TenantA, ChannelId));

        catalog.SetMonitored(TenantA, ChannelId, enabled: true);
        Assert.True(catalog.IsMonitored(TenantA, ChannelId));

        catalog.SetMonitored(TenantA, ChannelId, enabled: false);
        Assert.False(catalog.IsMonitored(TenantA, ChannelId));
    }

    /// <summary>
    /// Мониторинг изолирован по тенантам
    /// </summary>
    [Fact]
    public void Monitored_IsIsolatedPerTenant()
    {
        var catalog = new DialogCatalog();
        catalog.SetMonitored(TenantA, ChannelId, enabled: true);

        Assert.True(catalog.IsMonitored(TenantA, ChannelId));
        Assert.False(catalog.IsMonitored(TenantB, ChannelId));
    }

    /// <summary>
    /// SetMonitorAll(true) мониторит каталог и возвращает его размер; false — снимает всё.
    /// </summary>
    [Fact]
    public void SetAllMonitored_EnablesKnownDialogs_AndReturnsCount()
    {
        var catalog = new DialogCatalog();
        catalog.ReplaceKnown(TenantA, [ChannelId, GroupId, UserId]);

        int count = catalog.SetAllMonitored(TenantA, enabled: true);

        Assert.Equal(3, count);
        Assert.True(catalog.IsMonitored(TenantA, ChannelId));
        Assert.True(catalog.IsMonitored(TenantA, GroupId));
        Assert.True(catalog.IsMonitored(TenantA, UserId));

        catalog.SetAllMonitored(TenantA, enabled: false);
        Assert.False(catalog.IsMonitored(TenantA, ChannelId));
        Assert.False(catalog.IsMonitored(TenantA, GroupId));
        Assert.Equal(3, catalog.KnownCount(TenantA));
    }

    /// <summary>
    /// SetMonitorAll(true) сохраняет мониторинг записей вне каталога
    /// </summary>
    [Fact]
    public void SetAllMonitored_TrueKeepsExistingMonitoredOutsideKnown()
    {
        var catalog = new DialogCatalog();
        catalog.SetMonitored(TenantA, UserId, enabled: true);

        catalog.SetAllMonitored(TenantA, enabled: true);

        Assert.True(catalog.IsMonitored(TenantA, UserId));
    }

    /// <summary>
    /// Актуализация ответом SyncDialogs
    /// </summary>
    [Fact]
    public void ReplaceMonitored_OverridesMirror_WithCoreReply()
    {
        var catalog = new DialogCatalog();
        catalog.SetMonitored(TenantA, GroupId, enabled: true);
        catalog.SetMonitored(TenantA, UserId, enabled: true);

        catalog.ReplaceKnown(TenantA, [ChannelId, GroupId]);
        catalog.ReplaceMonitored(TenantA, [GroupId]);

        Assert.False(catalog.IsMonitored(TenantA, UserId)); // ядро сняло мониторинг (нет в каталоге)
        Assert.True(catalog.IsMonitored(TenantA, GroupId));
        Assert.False(catalog.IsMonitored(TenantA, ChannelId));
    }

    /// <summary>
    /// Reset (Logout) очищает каталог и мониторинг тенанта (`.clear`).
    /// </summary>
    [Fact]
    public void Reset_ClearsTenantState()
    {
        var catalog = new DialogCatalog();
        catalog.ReplaceKnown(TenantA, [ChannelId]);
        catalog.SetMonitored(TenantA, ChannelId, enabled: true);

        catalog.Reset(TenantA);

        Assert.Equal(0, catalog.KnownCount(TenantA));
        Assert.False(catalog.IsMonitored(TenantA, ChannelId));
    }

    /// <summary>
    /// Каталог пустого тенанта
    /// </summary>
    [Fact]
    public void UnknownTenant_ReportsEmptyState()
    {
        var catalog = new DialogCatalog();

        Assert.Equal(0, catalog.KnownCount(TenantB));
        Assert.False(catalog.IsMonitored(TenantB, ChannelId));
        Assert.Empty(catalog.SnapshotMonitored(TenantB));
    }
}