using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Service.S8;
using Xunit;

namespace Admin.NET.Plugin.AiDOP.Tests.S8;

/// <summary>
/// S8-STEP6C-CFG-NOTIFY-FIX-AND-CERT-1 · N-1 回归。
///
/// 覆盖 <see cref="S8NotificationLayerMerge"/> 的逐层覆盖语义。这是纯函数测试，不触 DB、不触 pusher。
/// runtime resolver 与配置页 ListAsync 都调用同一个 Effective()，因此本文件同时守住两处。
///
/// 被守住的缺陷（修正前真实存在）：工厂只为某一层建行，平台默认在该 scene+severity 下的
/// **其余层级会整体消失** —— 工厂本意「补一层」，实际「换掉整组」，且页面上不可见。
/// </summary>
public class S8NotificationLayerMergeTests
{
    private const long GlobalTenant = 0L;
    private const long GlobalFactory = 0L;
    private const long FactoryTenant = 838257186181189L;
    private const long FactoryFactory = 838257186320453L;

    private static AdoS8NotificationLayer Row(
        long id, long tenantId, long factoryId, string scene, string severity, string level) =>
        new()
        {
            Id = id,
            TenantId = tenantId,
            FactoryId = factoryId,
            SceneCode = scene,
            Severity = severity,
            LevelCode = level,
            TargetRoleIds = "ROLE_X",
            NotifyChannel = "log,SignalR"
        };

    private static AdoS8NotificationLayer Global(long id, string scene, string sev, string level) =>
        Row(id, GlobalTenant, GlobalFactory, scene, sev, level);

    private static AdoS8NotificationLayer Factory(long id, string scene, string sev, string level) =>
        Row(id, FactoryTenant, FactoryFactory, scene, sev, level);

    /// <summary>
    /// N-1 的核心回归：工厂只覆盖 L2，平台默认的 L1 / L3 必须**继续生效**。
    /// 修正前此处会只剩 1 行（工厂的 L2），L1/L3 静默消失。
    /// </summary>
    [Fact]
    public void FactoryOverrideOnOneLevel_KeepsPlatformDefaultsOnOtherLevels()
    {
        var candidates = new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Global(2, "S1", "FOLLOW", "L2_MANAGER"),
            Global(3, "S1", "FOLLOW", "L3_DIRECTOR"),
            Factory(100, "S1", "FOLLOW", "L2_MANAGER"),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Equal(3, effective.Count);
        Assert.Equal(new[] { "L1_OPERATOR", "L2_MANAGER", "L3_DIRECTOR" }, effective.Select(x => x.LevelCode));
        // L1 / L3 仍来自平台默认，L2 被工厂接管
        Assert.Equal(GlobalTenant, effective[0].TenantId);
        Assert.Equal(FactoryTenant, effective[1].TenantId);
        Assert.Equal(100, effective[1].Id);
        Assert.Equal(GlobalTenant, effective[2].TenantId);
    }

    /// <summary>同层级有工厂行时，该层级的平台默认必须被替换掉（不能两行都发）。</summary>
    [Fact]
    public void FactoryRow_ReplacesPlatformDefault_OnSameLevel()
    {
        var candidates = new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Factory(100, "S1", "FOLLOW", "L1_OPERATOR"),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Single(effective);
        Assert.Equal(100, effective[0].Id);
    }

    /// <summary>覆盖不跨 scene / severity：S1 的工厂行不得影响 S2，FOLLOW 的不得影响 SERIOUS。</summary>
    [Fact]
    public void Override_DoesNotLeakAcrossSceneOrSeverity()
    {
        var candidates = new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Global(2, "S1", "SERIOUS", "L1_OPERATOR"),
            Global(3, "S2", "FOLLOW", "L1_OPERATOR"),
            Factory(100, "S1", "FOLLOW", "L1_OPERATOR"),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Equal(3, effective.Count);
        Assert.Equal(100, effective.Single(x => x.SceneCode == "S1" && x.Severity == "FOLLOW").Id);
        Assert.Equal(2, effective.Single(x => x.SceneCode == "S1" && x.Severity == "SERIOUS").Id);
        Assert.Equal(3, effective.Single(x => x.SceneCode == "S2").Id);
    }

    /// <summary>
    /// severity 参与分组前必须归一：平台默认写 FOLLOW、工厂行写 legacy 的 LOW，
    /// 二者是同一档，必须归到同一组由工厂接管，而不是各发一条。
    /// </summary>
    [Fact]
    public void SeverityIsNormalizedBeforeGrouping()
    {
        var candidates = new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Factory(100, "S1", "LOW", "L1_OPERATOR"),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Single(effective);
        Assert.Equal(100, effective[0].Id);
    }

    /// <summary>level_code 归一：大小写 / 空白差异不得让工厂行与平台默认分到两组。</summary>
    [Fact]
    public void LevelIsNormalizedBeforeGrouping()
    {
        var candidates = new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Factory(100, "S1", "FOLLOW", " l1_operator "),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Single(effective);
        Assert.Equal(100, effective[0].Id);
    }

    /// <summary>
    /// 历史脏数据：level_code = '' 的行自成一组，既不吞掉合法层级、也不被合法层级吞掉。
    /// （库中实测存在这样的行。）
    /// </summary>
    [Fact]
    public void EmptyLevelCode_FormsItsOwnGroup()
    {
        var candidates = new[]
        {
            Global(1, "S1", "SERIOUS", "L1_OPERATOR"),
            Factory(100, "S1", "SERIOUS", ""),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Equal(2, effective.Count);
        Assert.Contains(effective, x => x.Id == 1);
        Assert.Contains(effective, x => x.Id == 100);
    }

    /// <summary>
    /// 无唯一索引，同键可能重复行：必须全部保留（丢弃会让 runtime 与页面不一致），
    /// 且顺序按 Id 稳定，不依赖 DB 返回序。
    /// </summary>
    [Fact]
    public void DuplicateRowsOnSameKey_AreAllKept_InStableIdOrder()
    {
        var candidates = new[]
        {
            Factory(300, "S1", "FOLLOW", "L1_OPERATOR"),
            Factory(100, "S1", "FOLLOW", "L1_OPERATOR"),
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
        };

        var effective = S8NotificationLayerMerge.Effective(candidates);

        Assert.Equal(new[] { 100L, 300L }, effective.Select(x => x.Id));
    }

    /// <summary>输入顺序不影响输出：稳定确定序是 scene → severity → level → id。</summary>
    [Fact]
    public void OrderingIsDeterministic_RegardlessOfInputOrder()
    {
        var rows = new[]
        {
            Global(3, "S2", "FOLLOW", "L1_OPERATOR"),
            Global(2, "S1", "SERIOUS", "L1_OPERATOR"),
            Global(1, "S1", "FOLLOW", "L2_MANAGER"),
            Global(4, "S1", "FOLLOW", "L1_OPERATOR"),
        };

        var forward = S8NotificationLayerMerge.Effective(rows).Select(x => x.Id).ToList();
        var reversed = S8NotificationLayerMerge.Effective(rows.Reverse().ToList()).Select(x => x.Id).ToList();

        Assert.Equal(new[] { 4L, 1L, 2L, 3L }, forward);
        Assert.Equal(forward, reversed);
    }

    /// <summary>只有平台默认时全部生效；只有工厂行时同理。</summary>
    [Fact]
    public void SingleSidedCandidates_PassThrough()
    {
        var globalsOnly = S8NotificationLayerMerge.Effective(new[]
        {
            Global(1, "S1", "FOLLOW", "L1_OPERATOR"),
            Global(2, "S1", "FOLLOW", "L2_MANAGER"),
        });
        Assert.Equal(2, globalsOnly.Count);

        var factoryOnly = S8NotificationLayerMerge.Effective(new[]
        {
            Factory(100, "S1", "FOLLOW", "L1_OPERATOR"),
        });
        Assert.Single(factoryOnly);

        Assert.Empty(S8NotificationLayerMerge.Effective(Array.Empty<AdoS8NotificationLayer>()));
    }
}