using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Service.S8;
using Admin.NET.Plugin.AiDOP.Service.S8.Rules;
using Admin.NET.Plugin.AiDOP.Service.S8.Rules.DataAccess;
using Microsoft.Extensions.Logging.Abstractions;
using Xunit;

namespace Admin.NET.Test.S8;

/// <summary>
/// S8-LEGACY-SQL-RESIDUAL-CLEANUP-3：停止新增 SQL 技术债。
///
/// 治理口径不是"禁止一切 LEGACY_SQL"——132 条历史规则仍需运行，向导也仍在用服务端生成的 SQL。
/// 真正要掐断的是**调用方自带 expression** 这条路径：它既是技术债来源，也是注入面。
/// 因此按创建来源区分：
///   · EXTERNAL_API（裸 REST，调用方自带 SQL）→ 拒绝
///   · WIZARD_GENERATED（服务端字典白名单生成）→ 暂时放行，随向导迁移后收口
/// </summary>
public class S8LegacySqlGovernanceTests
{
    private static AdoS8WatchRule LegacyRule() => new()
    {
        RuleCode = "UT_NEW_LEGACY",
        RuleType = "TIMEOUT",
        DataAccessMode = null,                 // 等价 LEGACY_SQL
        Expression = "SELECT * FROM some_physical_table WHERE 1=1"
    };

    private static AdoS8WatchRule StandardRule() => new()
    {
        RuleCode = "UT_NEW_STANDARD",
        RuleType = "TIMEOUT",
        DataAccessMode = S8DataAccessMode.StandardDataset,
        DatasetCode = "ANY_DATASET"
    };

    // ============================================================
    // C. 新建 Legacy SQL 规则
    // ============================================================

    [Fact]
    public void ExternalApi_CreatingLegacySqlRule_IsRejected()
    {
        var ex = Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureCreationAllowed(LegacyRule(), S8RuleCreationOrigin.ExternalApi));
        Assert.Contains(S8RuleCreationPolicy.LegacySqlCreationDisabledReason, ex.Message);
    }

    [Fact]
    public void ExternalApi_CreatingLegacySqlRule_ExplicitMode_IsAlsoRejected()
    {
        // 显式写 LEGACY_SQL 与留空等价，不能靠显式声明绕过治理。
        var rule = LegacyRule();
        rule.DataAccessMode = S8DataAccessMode.LegacySql;
        Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureCreationAllowed(rule, S8RuleCreationOrigin.ExternalApi));
    }

    [Fact]
    public void WizardGenerated_LegacySqlRule_IsNowAlsoRejected()
    {
        // 语义变更（S8-LEGACY-RUNTIME-RETIREMENT-1）：本用例原名
        // WizardGenerated_LegacySqlRule_StillAllowed —— 当时向导是唯一豁免通道，
        // 因为它是在产流程且 SQL 由服务端按字典白名单生成。
        //
        // 该豁免现已取消：没有治理 Dataset 就没有可运行 Rule，不再用 Legacy SQL 兜底。
        // 向导保留独立文案（提示"当前对象无治理数据集"），因为在向导里报
        // "不接受你自带的 SQL" 会让用户完全对不上号 —— 他并没有写过 SQL。
        var ex = Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureCreationAllowed(LegacyRule(), S8RuleCreationOrigin.WizardGenerated));
        Assert.Contains(S8RuleCreationPolicy.LegacySqlRetiredReason, ex.Message);
    }

    [Fact]
    public void StandardDatasetRule_AllowedFromAnyOrigin()
    {
        S8RuleCreationPolicy.EnsureCreationAllowed(StandardRule(), S8RuleCreationOrigin.ExternalApi);
        S8RuleCreationPolicy.EnsureCreationAllowed(StandardRule(), S8RuleCreationOrigin.WizardGenerated);
    }

    [Fact]
    public void UnknownOrigin_IsTreatedAsExternal_FailClosed()
    {
        // 未知来源按最严格处理：新增调用方不会因为忘记声明来源而意外获得放行。
        Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureCreationAllowed(LegacyRule(), "SOMETHING_NEW"));
    }

    // ============================================================
    // D. 历史 Legacy 规则的维护不受治理影响
    // ============================================================

    [Fact]
    public void ExistingLegacyRule_CanStillBeDisabled()
    {
        // 这条**必须**保持放行：若关停也被拦，数据集/数据源一出问题规则就再也关不掉，
        // 只能去改库。退役门禁的方向是单向的 —— 只拦「进入运行态」。
        var existing = LegacyRule();
        S8RuleCreationPolicy.EnsureMaintenanceAllowed(existing, enabling: false);
    }

    [Fact]
    public void ExistingLegacyRule_CannotBeReEnabled_AfterRuntimeRetirement()
    {
        // 语义变更（S8-LEGACY-RUNTIME-RETIREMENT-1）：本用例原名
        // ExistingLegacyRule_CanStillBeReEnabled —— 上一阶段的治理目标是"不新增旧债"，
        // 故存量规则重新启用是放行的。本阶段目标升级为"旧债不得运行"，因此反转。
        var ex = Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureMaintenanceAllowed(LegacyRule(), enabling: true));
        Assert.Contains(S8RuleCreationPolicy.LegacySqlRetiredReason, ex.Message);
    }

    [Fact]
    public void ExplicitLegacyMode_CannotBeReEnabled_Either()
    {
        // NULL（历史现状）与显式 LEGACY_SQL 必须同样被拦，否则回填一次字面值就能绕过退役。
        var rule = LegacyRule();
        rule.DataAccessMode = S8DataAccessMode.LegacySql;
        Assert.Throws<S8BizException>(() =>
            S8RuleCreationPolicy.EnsureMaintenanceAllowed(rule, enabling: true));
    }

    [Fact]
    public void StandardDatasetRule_CanBeEnabled()
    {
        // 正向对照：退役门禁不能误伤 STANDARD_DATASET（Rule 01 走的正是这条路）。
        S8RuleCreationPolicy.EnsureMaintenanceAllowed(StandardRule(), enabling: true);
    }

    // ============================================================
    // E. 运行资格判定（调度器纵深防御所依赖的同一个谓词）
    // ============================================================

    [Theory]
    [InlineData(null)]              // 132 条历史规则的现状
    [InlineData("")]                // 空串
    [InlineData("   ")]             // 空白
    [InlineData("LEGACY_SQL")]      // 显式声明
    [InlineData("legacy_sql")]      // 大小写变体
    [InlineData("SOMETHING_ELSE")]  // 脏数据：既非 Legacy 也非 Standard
    public void IsRuntimeEligible_IsFalse_ForEverythingButStandardDataset(string? mode)
    {
        var rule = LegacyRule();
        rule.DataAccessMode = mode;
        Assert.False(S8RuleCreationPolicy.IsRuntimeEligible(rule));
    }

    [Theory]
    [InlineData("STANDARD_DATASET")]
    [InlineData("standard_dataset")]  // Resolve 对模式值大小写不敏感
    public void IsRuntimeEligible_IsTrue_ForStandardDataset(string mode)
    {
        var rule = StandardRule();
        rule.DataAccessMode = mode;
        Assert.True(S8RuleCreationPolicy.IsRuntimeEligible(rule));
    }

    [Fact]
    public void IsRuntimeEligible_DoesNotThrow_OnDirtyModeValue()
    {
        // 调度器每个 tick 都会调它。脏数据必须返回 false 而不是抛异常中断整个 tick，
        // 否则一条坏行就能让全租户的监控停摆（S8DataAccessMode.Resolve 对未知值是抛错的）。
        var rule = LegacyRule();
        rule.DataAccessMode = "NOT_A_REAL_MODE";
        Assert.False(S8RuleCreationPolicy.IsRuntimeEligible(rule));
    }

    // ============================================================
    // B. STANDARD_DATASET 即使带恶意 SQL 也绝不执行
    // ============================================================

    private const string PoisonDataset = "FAKE_POISON_DATASET";

    private static S8DatasetCapabilities TimeoutCapable() => new()
    {
        SupportsTimeout = true,
        HasSourceObjectId = true,
        HasRelatedObjectCode = true,
        HasDueAt = true,
        HasStatus = true
    };

    private sealed class PoisonSource : IS8DatasetDefinitionSource
    {
        public IEnumerable<S8DatasetDefinition> GetDefinitions() => new[]
        {
            new S8DatasetDefinition
            {
                DatasetCode = PoisonDataset,
                DisplayName = "恶意SQL防护测试数据集",
                Kind = S8DatasetKind.Object,
                Capabilities = TimeoutCapable()
            }
        };
    }

    private sealed class EmptyProvider : IS8MonitoringDataProvider
    {
        public string DatasetCode => PoisonDataset;
        public S8DatasetCapabilities Capabilities => TimeoutCapable();
        public Task<S8MonitoringRowSet> LoadAsync(S8MonitoringDataRequest request, CancellationToken cancellationToken = default)
        {
            request.EnsureValid();
            return Task.FromResult(S8MonitoringRowSet.Empty);
        }
    }

    private sealed class SpyLegacy : IS8LegacySqlDataProvider
    {
        public int CallCount { get; private set; }
        public string LastExpression { get; private set; }

        public Task<S8MonitoringDataResult> LoadAsync(
            long tenantId, long factoryId, AdoS8WatchRule rule, string ruleType,
            int timeoutSeconds, CancellationToken cancellationToken = default)
        {
            CallCount++;
            LastExpression = rule.Expression;
            return Task.FromResult(new S8MonitoringDataResult { RowSet = S8MonitoringRowSet.Empty });
        }
    }

    [Fact]
    public async Task StandardDataset_MaliciousExpression_IsNeverExecuted()
    {
        var legacy = new SpyLegacy();
        var gateway = new S8MonitoringDataGateway(
            legacy,
            new S8MonitoringDataProviderRegistry(new[] { new EmptyProvider() }),
            new S8DatasetCatalog(new[] { new PoisonSource() }),
            NullLogger<S8MonitoringDataGateway>.Instance);

        var rule = new AdoS8WatchRule
        {
            RuleCode = "UT_POISON",
            RuleType = "TIMEOUT",
            DataAccessMode = S8DataAccessMode.StandardDataset,
            DatasetCode = PoisonDataset,
            // 即使历史遗留字段里躺着可执行 SQL，STANDARD_DATASET 路径也绝不能碰它。
            Expression = "DROP TABLE ado_s8_exception; SELECT SHOULD_NEVER_RUN"
        };

        var result = await gateway.LoadAsync(1, 1, rule, "TIMEOUT", 60, 1000);

        Assert.Equal(S8DataAccessMode.StandardDataset, result.DataAccessMode);
        Assert.Equal(0, legacy.CallCount);
        Assert.Null(legacy.LastExpression);
    }
}