using Xunit;

namespace Admin.NET.Plugin.AiDOP.Tests.S6.Manufacturing;

/// <summary>
/// S6-PI-RESUBMIT-1 源码契约测试：`S6_PROCESS_INSPECTION` 主管退回 → N1 后的重新提交闭环。
///
/// 缺口：`ReturnToPrev` 只回退 <c>CurrentNodeId</c>、**实例仍是 Running**，而 SubmitReview 原先
/// 用「实例 Running」当作「已提交」的代理判据，于是把合法重提一并挡死，单据卡在 N1 无专用出口。
///
/// 修法（Option A）：复用同一 submit-review 入口，按真实 Flow 状态分流 ——
///   无实例 / 上一轮 Rejected|Cancelled → 首次提交（StartFlow + 通过 N1）
///   Running + 节点已回 N1 + 本人持有该 N1 待办 → 重新提交（沿用同一实例，只通过既有任务）
/// 关键是**不放宽 Running**：N2/N3 仍拒绝、非本人待办仍拒绝、终态仍拒绝。
///
/// 沿用本仓既有做法——源码契约断言而非行为级集成测试：该 service 依赖 ISqlSugarClient /
/// FlowEngineService，裸 xUnit 进程无法实例化（见 S8ExceptionFlowTenantContextContractTests）。
/// 真实状态矩阵由本批 Runtime R1–R15 覆盖。
/// </summary>
public class S6ProcessInspectionResubmitContractTests
{
    private static string Svc() => File.ReadAllText(FindFile(
        "server", "Plugins", "Admin.NET.Plugin.AiDOP", "Manufacturing", "S6ProcessInspectionReviewService.cs"));

    private static string Engine() => File.ReadAllText(FindFile(
        "server", "Plugins", "Admin.NET.Plugin.ApprovalFlow", "Service", "FlowEngine", "FlowEngineService.cs"));

    /// <summary>
    /// 提交审核按钮的归属页面。
    /// 2026-09-14 更新：S6-IPQC-BILL-PAGE-1 把 Drawer 退役、审核动作搬到独立详情页
    /// `process-quality/ipqcBillDetail.vue`，原先指向 `productionInstructionList.vue` 的断言
    /// 在那批之后就已失效（该批未重跑本套件，本轮补上）。
    /// </summary>
    private static string Frontend() => File.ReadAllText(FindFile(
        "Web", "src", "views", "aidop", "s6", "process-quality", "ipqcBillDetail.vue"));

    // ── 不得简单放宽 Running ──

    /// <summary>原先那句无条件拒绝必须消失，否则重提永远进不来。</summary>
    [Fact]
    public void SubmitReview_NoLongerRejectsEveryRunningInstance()
    {
        Assert.DoesNotContain("该检验单已在审核中，请勿重复提交", Svc());
    }

    /// <summary>但绝不能退化成「Running 就放行」——必须经过 N1 + 本人待办的判定。</summary>
    [Fact]
    public void SubmitReview_DoesNotBlanketAllowRunning()
    {
        var body = SubmitReviewBody();
        Assert.Contains("RequireResubmittableTaskAsync(inst)", body);
        // 不得出现「Running 直接进重提分支」的写法
        Assert.DoesNotContain("if (inst != null && inst.Status == FlowInstanceStatusEnum.Running)\n            return", body);
    }

    // ── 重提判定：节点 + 待办归属 ──

    /// <summary>仅凭 CurrentNodeId 不够：必须同时验证本人持有 Pending 任务且该任务在 N1。</summary>
    [Fact]
    public void ResubmitGate_ChecksNodeAndPendingTaskOwnership()
    {
        var guard = Slice(Svc(),
            "private async Task<ApprovalFlowTask> RequireResubmittableTaskAsync",
            "private async Task<bool> HasRoleAsync");
        Assert.Contains("inst.CurrentNodeId != S6ProcessInspectionFlowConst.NodeSubmit", guard);
        Assert.Contains("GetMyPendingTaskAsync(inst.Id)", guard);
        Assert.Contains("myTask.NodeId != S6ProcessInspectionFlowConst.NodeSubmit", guard);
    }

    /// <summary>待办归属必须按当前用户过滤——同租户其他人不得重提。</summary>
    [Fact]
    public void PendingTaskLookup_IsScopedToCurrentUser()
    {
        var helper = Slice(Svc(), "private async Task<ApprovalFlowTask?> GetMyPendingTaskAsync", "private async Task<(ApprovalFlowInstance");
        Assert.Contains("_userManager.UserId", helper);
        Assert.Contains("x.AssigneeId == userId", helper);
        Assert.Contains("x.Status == FlowTaskStatusEnum.Pending", helper);
    }

    /// <summary>两类拒绝必须可区分，不得回落成模糊的「状态错误」。</summary>
    [Theory]
    [InlineData("当前流程节点不允许提交审核")]
    [InlineData("当前用户不是该检验单当前检验任务处理人")]
    [InlineData("该检验单审核流程已结束")]
    public void RejectionMessages_AreSpecific(string message)
    {
        Assert.Contains(message, Svc());
    }

    // ── 首次提交契约不得回归 ──

    /// <summary>COMPLETED 门槛对首次与重提一视同仁，且在分流之前。</summary>
    [Fact]
    public void CompletedGate_AppliesBeforeBranching()
    {
        var body = SubmitReviewBody();
        var gateAt = body.IndexOf("INSPECTION_NOT_COMPLETED", StringComparison.Ordinal);
        var branchAt = body.IndexOf("RequireResubmittableTaskAsync", StringComparison.Ordinal);
        Assert.True(gateAt > 0 && branchAt > gateAt, "COMPLETED 门槛必须先于重提分流");
    }

    /// <summary>租户隔离：分流前必须先经过租户作用域的单据加载。</summary>
    [Fact]
    public void TenantScopedBillLoad_HappensFirst()
    {
        var body = SubmitReviewBody();
        var loadAt = body.IndexOf("LoadBillAsync(input.BillId)", StringComparison.Ordinal);
        var instAt = body.IndexOf("GetLatestInstanceAsync(input.BillId)", StringComparison.Ordinal);
        Assert.True(loadAt >= 0 && instAt > loadAt, "必须先加载本租户单据再读流程状态");
        var load = Slice(Svc(), "private async Task<BillRow> LoadBillAsync", "private async Task<ApprovalFlowInstance?> GetLatestInstanceAsync");
        Assert.Contains("b.tenant_id=@tid", load);
        Assert.Contains("ResolveTenantOrThrow()", load);
    }

    /// <summary>已终结（Approved）的流程仍必须拒绝，不得被重提分支放行。</summary>
    [Fact]
    public void CompletedFlow_StillDenied()
    {
        var body = SubmitReviewBody();
        Assert.Contains("inst.Status != FlowInstanceStatusEnum.Rejected", body);
        Assert.Contains("inst.Status != FlowInstanceStatusEnum.Cancelled", body);
        Assert.Contains("该检验单审核流程已结束", body);
    }

    // ── 重复副作用：重提不得重跑首次路径 ──

    /// <summary>StartFlow 每次都会新建实例，重提路径必须绕开它，只 Approve 既有任务。</summary>
    [Fact]
    public void Resubmit_ReusesSameInstance_DoesNotStartFlowAgain()
    {
        var body = SubmitReviewBody();
        var startAt = body.IndexOf("_flowEngine.StartFlow(", StringComparison.Ordinal);
        var guardAt = body.IndexOf("if (taskId == null)", StringComparison.Ordinal);
        Assert.True(guardAt > 0, "缺少「无既有任务才起流程」的分支");
        Assert.True(startAt > guardAt, "StartFlow 必须落在 taskId == null 分支内");
        // 只有一处 StartFlow，避免重提路径另起一个实例
        Assert.Equal(1, CountOf(body, "_flowEngine.StartFlow("));
    }

    /// <summary>两条路径最终汇合到同一次 Approve，不得各写一份推进逻辑。</summary>
    [Fact]
    public void BothPaths_ConvergeOnSingleApprove()
    {
        var body = SubmitReviewBody();
        Assert.Equal(1, CountOf(body, "_flowEngine.Approve("));
        Assert.Contains("_flowEngine.Approve(taskId.Value, input.Comment)", body);
    }

    /// <summary>事务边界不得被破坏：业务判定 + Flow 推进仍同一事务且失败 rethrow。</summary>
    [Fact]
    public void SubmitReview_StaysTransactional()
    {
        var body = SubmitReviewBody();
        var tranAt = body.IndexOf("_db.AsTenant().UseTranAsync(", StringComparison.Ordinal);
        var approveAt = body.IndexOf("_flowEngine.Approve(", StringComparison.Ordinal);
        Assert.True(tranAt > 0 && approveAt > tranAt, "推进必须在事务内");
        Assert.Contains("if (!tran.IsSuccess) throw tran.ErrorException;", body);
    }

    // ── capability flag ──

    /// <summary>退回态必须把 canSubmitReview 打开，且仍受 COMPLETED 约束。</summary>
    [Fact]
    public void State_ExposesCanSubmitReviewOnReturnedNode()
    {
        var s = Svc();
        var branch = Slice(s, "else if (myTask.NodeId == S6ProcessInspectionFlowConst.NodeSubmit)", "}\n        }\n        else");
        Assert.Contains("output.CanSubmitReview = completed;", branch);
        Assert.Contains("已退回", branch);
    }

    /// <summary>不得新增让前端自己推断业务状态的字段。</summary>
    [Theory]
    [InlineData("IsResubmit")]
    [InlineData("IsRejected")]
    [InlineData("IsFirstSubmit")]
    public void State_DoesNotAddFrontendInferenceFlags(string field)
    {
        Assert.DoesNotContain(field, Svc());
    }

    /// <summary>前端仍只按后端 capability 显示按钮，不得自己复制 Flow 判定。</summary>
    [Fact]
    public void Frontend_DrivenByBackendCapabilityOnly()
    {
        var s = VueSource.CodeOnly(Frontend());
        Assert.Contains("review?.canSubmitReview", s);
        Assert.DoesNotContain("N1_SUBMIT", s);
        Assert.DoesNotContain("=== 'Running'", s);
    }

    // ── 上游语义冻结（本批不改，防被无意改坏）──

    /// <summary>ReturnToPrev 必须保持「同一实例 + 新建前节点待办」语义，重提正是建立在它之上。</summary>
    [Fact]
    public void ReturnToPrev_KeepsSameInstanceAndRebuildsPrevTask()
    {
        var body = Slice(Engine(), "public async Task ReturnToPrev(long taskId, string? comment)", "/// <summary>\n    /// 加签");
        Assert.Contains("instance.CurrentNodeId = prevNodeId;", body);
        Assert.Contains("CreateTasksForNode(instance, flowData, prevNodeId)", body);
        Assert.Contains("FlowTaskStatusEnum.Returned", body);
        // 不得在退回时把实例置为终态，否则重提无从谈起
        Assert.DoesNotContain("instance.Status = FlowInstanceStatusEnum.Rejected", body);
    }

    private static string SubmitReviewBody() => Slice(Svc(),
        "public async Task<S6ReviewStateOutput> SubmitReview(",
        "/// <summary>主管审核通过（N2）");

    private static int CountOf(string src, string needle)
    {
        int n = 0, i = 0;
        while ((i = src.IndexOf(needle, i, StringComparison.Ordinal)) >= 0) { n++; i += needle.Length; }
        return n;
    }

    private static string Slice(string src, string from, string to)
    {
        var a = src.IndexOf(from, StringComparison.Ordinal);
        Assert.True(a >= 0, $"未找到起点：{from}");
        var b = src.IndexOf(to, a + from.Length, StringComparison.Ordinal);
        return b > a ? src[a..b] : src[a..];
    }

    private static string FindFile(params string[] parts)
    {
        var dir = new DirectoryInfo(AppContext.BaseDirectory);
        while (dir != null)
        {
            var candidate = Path.Combine(new[] { dir.FullName }.Concat(parts).ToArray());
            if (File.Exists(candidate)) return candidate;
            dir = dir.Parent;
        }
        throw new FileNotFoundException(string.Join("/", parts));
    }
}