using BuildFlow.Shared.Domain.Common;
using BuildFlow.Shared.Domain.Exceptions;
using FluentAssertions;
using MediatR;
using Microsoft.EntityFrameworkCore;
using NSubstitute;
using Scripting.Application.Services;
using Scripting.Domain.Entities;
using Scripting.Domain.Enums;
using Scripting.Infrastructure.Persistence;
using Xunit;

namespace BuildFlow.Scripting.Tests;

/// <summary>
/// ScriptExecutionService 集成测试（spec §13 验收项映射）。
/// 使用真实 InMemory ScriptingDbContext + Mock ISender/ICurrentUserContext，覆盖：
/// 脚本执行返回结果、变量读取、沙箱拦截（File/Reflection 禁用 API）、草稿可测、
/// 状态守卫（Draft/Disabled 拒绝正式执行）、执行日志写入（success/timeout/failed）、
/// 编译缓存、Logger 输出收集、按名执行。
/// </summary>
public class ScriptExecutionServiceTests
{
    // ── 夹具 ───────────────────────────────────────────────────────────────

    private static (ScriptingDbContext db, ScriptExecutionService svc) CreateService(ISender? mediator = null)
    {
        var db = ScriptingTestDbFactory.Create();
        var sender = mediator ?? Substitute.For<ISender>();
        var currentUser = Substitute.For<ICurrentUserContext>();
        currentUser.UserId.Returns("test-user");
        currentUser.IPAddress.Returns("127.0.0.1");
        var svc = new ScriptExecutionService(db, sender, currentUser);
        return (db, svc);
    }

    private static ScriptFunction SeedScript(
        ScriptingDbContext db,
        string code,
        ScriptStatus status = ScriptStatus.Published,
        string name = "test-script",
        int timeoutMs = 5000)
    {
        var script = new ScriptFunction
        {
            Id = Guid.NewGuid(),
            Name = name,
            DisplayName = name,
            Code = code,
            Status = status,
            TimeoutMs = timeoutMs,
            CreatedBy = "test",
            UpdatedBy = "test",
            OperatorIP = "127.0.0.1",
        };
        db.Scripts.Add(script);
        db.SaveChanges();
        return script;
    }

    // ── A1: 简单脚本返回结果 ──────────────────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_SimpleReturnScript_ReturnsSerializedResult()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 42;");
        await using var _ = db;

        var result = await svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        result.Status.Should().Be(ScriptExecutionStatus.Success);
        result.ResultJson.Should().Be("42");
    }

    // ── A2: 脚本读取 Variables（原生类型） ─────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_ScriptReadsVariable_ReturnsComputedResult()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return (long)Variables[\"x\"] + (long)Variables[\"y\"];");
        await using var _ = db;

        var result = await svc.ExecuteByIdAsync(script.Id, """{"x":3,"y":4}""", CancellationToken.None);

        result.Status.Should().Be(ScriptExecutionStatus.Success);
        result.ResultJson.Should().Be("7");
    }

    // ── §13 #4: SANDBOX — 禁用 API（File）被拦截 ───────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_ForbiddenFileApi_ThrowsBusinessException()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, """System.IO.File.ReadAllText("/etc/passwd"); return 1;""");
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        (await act.Should().ThrowAsync<BusinessException>())
            .WithMessage("*禁用*")
            .Which.Message.Should().Contain("File");
    }

    // ── §13 #4: SANDBOX — Reflection 被拦截 ────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_ReflectionApi_ThrowsBusinessException()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "var a = System.Reflection.Assembly.GetExecutingAssembly(); return 1;");
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        (await act.Should().ThrowAsync<BusinessException>())
            .WithMessage("*禁用*");
    }

    // ── §13 #5: 草稿可测（ExecuteTestAsync 跳过 Published 校验） ───────────

    [Fact]
    public async Task ExecuteTestAsync_DraftScript_ExecutesSuccessfully()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 42;", status: ScriptStatus.Draft);
        await using var _ = db;

        var result = await svc.ExecuteTestAsync(script.Id, "{}", CancellationToken.None);

        result.Status.Should().Be(ScriptExecutionStatus.Success);
        result.ResultJson.Should().Be("42");
        // 测试执行日志的 FunctionName 应标注 [TEST]
        (await db.ScriptExecutionLogs.FirstAsync()).FunctionName.Should().Be("[TEST] test-script");
    }

    // ── 状态守卫：ExecuteByIdAsync 拒绝 Draft ──────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_DraftScript_ThrowsNotPublished()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 1;", status: ScriptStatus.Draft);
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>().WithMessage("*尚未发布*");
    }

    // ── 状态守卫：ExecuteByIdAsync 拒绝 Disabled ───────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_DisabledScript_ThrowsDisabled()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 1;", status: ScriptStatus.Disabled);
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>().WithMessage("*已禁用*");
    }

    // ── §13 #10: 成功执行写入执行日志 ─────────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_Success_WritesExecutionLog()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 42;");
        await using var _ = db;

        await svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        var logs = await db.ScriptExecutionLogs.ToListAsync();
        logs.Should().HaveCount(1);
        logs[0].Status.Should().Be(ScriptExecutionStatus.Success);
        logs[0].FunctionId.Should().Be(script.Id);
        logs[0].ResultJson.Should().Be("42");
        logs[0].ErrorMessage.Should().BeNull();
    }

    // ── §13 #10: 超时执行写入 Timeout 日志 ────────────────────────────────
    // 注：CSharpScript 的取消是协作式的（仅在 await 检查点响应令牌）。
    // 真实长耗时脚本会用 Task.Delay(CancellationToken) 在 await 处被中断，
    // 因此这里用 Task.Delay 而非 while(true){} 自旋（自旋不检查令牌会卡死）。

    [Fact]
    public async Task ExecuteByIdAsync_Timeout_WritesTimeoutLog()
    {
        var (db, svc) = CreateService();
        // 脚本等待 10s，但超时设为 100ms，必定先超时
        var script = SeedScript(db, "await Task.Delay(10000, CancellationToken); return 1;", timeoutMs: 100);
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>().WithMessage("*超时*");
        var logs = await db.ScriptExecutionLogs.ToListAsync();
        logs.Should().HaveCount(1);
        logs[0].Status.Should().Be(ScriptExecutionStatus.Timeout);
        logs[0].ErrorMessage.Should().Contain("超时");
    }

    // ── 脚本运行时异常写入 Failed 日志 ────────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_RuntimeError_WritesFailedLog()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, """throw new System.Exception("boom");""");
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>();
        var logs = await db.ScriptExecutionLogs.ToListAsync();
        logs.Should().HaveCount(1);
        logs[0].Status.Should().Be(ScriptExecutionStatus.Failed);
        logs[0].ErrorMessage.Should().Contain("boom");
    }

    // ── 按名执行 ───────────────────────────────────────────────────────────

    [Fact]
    public async Task ExecuteByNameAsync_PublishedScript_ReturnsResult()
    {
        var (db, svc) = CreateService();
        SeedScript(db, "return 99;", name: "by-name-fn");
        await using var _ = db;

        var result = await svc.ExecuteByNameAsync("by-name-fn", "{}", CancellationToken.None);

        result.Status.Should().Be(ScriptExecutionStatus.Success);
        result.ResultJson.Should().Be("99");
    }

    [Fact]
    public async Task ExecuteByNameAsync_NotFound_ThrowsBusinessException()
    {
        var (db, svc) = CreateService();
        await using var _ = db;

        var act = () => svc.ExecuteByNameAsync("no-such-script", "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>().WithMessage("*不存在*");
    }

    // ── §13 #8: 编译缓存（同代码两次执行都成功） ───────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_SameCodeTwice_BothSucceed()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, "return 1 + 1;");
        await using var _ = db;

        var r1 = await svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);
        var r2 = await svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        r1.Status.Should().Be(ScriptExecutionStatus.Success);
        r2.Status.Should().Be(ScriptExecutionStatus.Success);
        r1.ResultJson.Should().Be("2");
        r2.ResultJson.Should().Be("2");
    }

    // ── Logger 输出收集 ────────────────────────────────────────────────────

    [Fact]
    public async Task ExecuteByIdAsync_ScriptLogs_ReturnsLogLines()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db, """Logger.Info("hello-from-script"); return 1;""");
        await using var _ = db;

        var result = await svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        result.LogLines.Should().NotBeNull();
        result.LogLines.Should().Contain("hello-from-script");
    }

    // ── §13 #3: 业务异常（如权限拒绝）直接冒泡不包裹 ──────────────────────
    // 模拟 MediatR handler 抛出权限拒绝类业务异常的场景：脚本里直接抛 BusinessException，
    // 验证 ScriptExecutionService 的 catch(BusinessException) 分支直接 rethrow 而非包裹成"脚本执行失败"。

    [Fact]
    public async Task ExecuteByIdAsync_ScriptThrowsBusinessException_BubblesUpUnwrapped()
    {
        var (db, svc) = CreateService();
        var script = SeedScript(db,
            """throw new BuildFlow.Shared.Domain.Exceptions.BusinessException("权限不足");""");
        await using var _ = db;

        var act = () => svc.ExecuteByIdAsync(script.Id, "{}", CancellationToken.None);

        (await act.Should().ThrowAsync<BusinessException>())
            .WithMessage("权限不足");
        // 业务异常路径仍应写 Failed 日志
        (await db.ScriptExecutionLogs.CountAsync()).Should().Be(1);
    }

    // ── 按名执行：草稿拒绝（requirePublished 守卫） ────────────────────────

    [Fact]
    public async Task ExecuteByNameAsync_DraftScript_ThrowsNotPublished()
    {
        var (db, svc) = CreateService();
        SeedScript(db, "return 1;", status: ScriptStatus.Draft, name: "draft-fn");
        await using var _ = db;

        var act = () => svc.ExecuteByNameAsync("draft-fn", "{}", CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>().WithMessage("*尚未发布*");
    }
}