namespace BuildFlow.Architecture.Tests;

using System.Text.RegularExpressions;
using Xunit;

/// <summary>
/// 后端优化闭环 SOP 的可执行合同测试，防止脚本退化为不可复现或会污染开发环境的手工步骤。
/// </summary>
public sealed class BackendOptimizationSopTests
{
    private static readonly string[] OrderedStages =
    [
        "01-preflight",
        "02-static-guards",
        "03-restore-build",
        "04-unit-tests",
        "05-start-infrastructure",
        "06-database-migrations",
        "07-integration-tests",
        "08-recovery-tests",
        "09-performance-tests",
        "10-full-solution",
    ];

    [Fact]
    public void ScriptShouldFailFastAndCleanOnlyItsComposeProject()
    {
        var script = ReadRequiredFile("scripts", "backend-optimization-sop.sh");

        Assert.Contains("#!/usr/bin/env bash", script, StringComparison.Ordinal);
        Assert.Contains("set -euo pipefail", script, StringComparison.Ordinal);
        Assert.Matches(new Regex(@"trap\s+cleanup\s+EXIT", RegexOptions.CultureInvariant), script);
        Assert.Contains(
            "docker compose -p \"$COMPOSE_PROJECT\" -f \"$COMPOSE_FILE\" down -v",
            script,
            StringComparison.Ordinal);
        Assert.DoesNotContain("docker compose down", script, StringComparison.Ordinal);
    }

    [Fact]
    public void ComposeShouldProvideFourPinnedRandomPortServices()
    {
        var compose = ReadRequiredFile("scripts", "backend-optimization-compose.yml");

        Assert.Contains("postgres:", compose, StringComparison.Ordinal);
        Assert.Contains("pgvector/pgvector:0.8.0-pg17", compose, StringComparison.Ordinal);
        Assert.Contains("redis:", compose, StringComparison.Ordinal);
        Assert.Contains("redis:7-alpine", compose, StringComparison.Ordinal);
        Assert.Contains("mongo:", compose, StringComparison.Ordinal);
        Assert.Contains("mongo:7", compose, StringComparison.Ordinal);
        Assert.Contains("minio:", compose, StringComparison.Ordinal);
        Assert.Contains("minio/minio:RELEASE.2025-04-22T22-12-26Z", compose, StringComparison.Ordinal);
        Assert.Contains("127.0.0.1::5432", compose, StringComparison.Ordinal);
        Assert.Contains("127.0.0.1::6379", compose, StringComparison.Ordinal);
        Assert.Contains("127.0.0.1::27017", compose, StringComparison.Ordinal);
        Assert.Contains("127.0.0.1::9000", compose, StringComparison.Ordinal);
    }

    [Fact]
    public void ScriptShouldArchiveOrderedStageCommandsTestsAndMetrics()
    {
        var script = ReadRequiredFile("scripts", "backend-optimization-sop.sh");
        var previousIndex = -1;

        foreach (var stage in OrderedStages)
        {
            var currentIndex = script.IndexOf($"run_stage '{stage}'", StringComparison.Ordinal);
            Assert.True(currentIndex > previousIndex, $"SOP 阶段缺失或顺序错误: {stage}");
            previousIndex = currentIndex;
        }

        Assert.Contains("dotnet restore \"$SOLUTION\"", script, StringComparison.Ordinal);
        Assert.Contains(
            "dotnet build \"$SOLUTION\" --no-restore -warnaserror",
            script,
            StringComparison.Ordinal);
        Assert.Contains("--logger \"trx;LogFileName=", script, StringComparison.Ordinal);
        Assert.Contains("--results-directory \"$TRX_DIR\"", script, StringComparison.Ordinal);
        Assert.Contains("assert_no_skipped_tests", script, StringComparison.Ordinal);
        Assert.Contains("collect_sop_metrics", script, StringComparison.Ordinal);
        Assert.Contains("\"$LOG_DIR\" \"$TRX_DIR\"", script, StringComparison.Ordinal);
        Assert.Contains("SOP_METRIC", script, StringComparison.Ordinal);
        Assert.Contains("summary.md", script, StringComparison.Ordinal);
        Assert.Contains("date -u +%Y%m%dT%H%M%SZ", script, StringComparison.Ordinal);
    }

    [Fact]
    public void ScriptShouldRunFinalDebtScansWithoutDeveloperSecretsOrDatabases()
    {
        var script = ReadRequiredFile("scripts", "backend-optimization-sop.sh");

        Assert.Contains("EndpointConstructorsShouldNotDependOnDbContexts", script, StringComparison.Ordinal);
        Assert.Contains("HostShouldNotContainInProcessBridges", script, StringComparison.Ordinal);
        Assert.Contains("BusinessExceptionsShouldSpecifySemanticErrorCodes", script, StringComparison.Ordinal);
        Assert.Contains("SourceFilesShouldContainAtMostOneTopLevelClassRecordOrEnum", script, StringComparison.Ordinal);
        Assert.Contains("Password\\s*=", script, StringComparison.Ordinal);
        Assert.Contains("DateTime\\.Now", script, StringComparison.Ordinal);
        Assert.Contains("Task\\.Run", script, StringComparison.Ordinal);
        Assert.DoesNotContain("appsettings.Secrets.json", script, StringComparison.Ordinal);
        Assert.DoesNotContain("rag123", script, StringComparison.Ordinal);
        Assert.DoesNotContain("Database=workflow;", script, StringComparison.Ordinal);
        Assert.DoesNotContain("Database=im_system;", script, StringComparison.Ordinal);
    }

    [Fact]
    public void OperatorGuideShouldDocumentInvocationIsolationAndEvidenceRules()
    {
        var guide = ReadRequiredFile("docs", "backend-optimization-sop.md");

        Assert.Contains("scripts/backend-optimization-sop.sh", guide, StringComparison.Ordinal);
        Assert.Contains("BACKEND_SOP_ARTIFACT_ROOT", guide, StringComparison.Ordinal);
        Assert.Contains("随机端口", guide, StringComparison.Ordinal);
        Assert.Contains("独立 Compose 项目", guide, StringComparison.Ordinal);
        Assert.Contains("TRX", guide, StringComparison.Ordinal);
        Assert.Contains("SOP_METRIC", guide, StringComparison.Ordinal);
        Assert.Contains("summary.md", guide, StringComparison.Ordinal);
        Assert.Contains("skipped", guide, StringComparison.OrdinalIgnoreCase);
        Assert.Contains("失败", guide, StringComparison.Ordinal);
    }

    private static string ReadRequiredFile(params string[] pathParts)
    {
        var repoRoot = FindRepoRoot();
        var path = Path.Combine([repoRoot.FullName, .. pathParts]);
        Assert.True(System.IO.File.Exists(path), $"SOP 合同文件不存在: {Path.GetRelativePath(repoRoot.FullName, path)}");
        return System.IO.File.ReadAllText(path);
    }

    private static DirectoryInfo FindRepoRoot()
    {
        var current = new DirectoryInfo(AppContext.BaseDirectory);
        while (current is not null)
        {
            if (System.IO.File.Exists(Path.Combine(current.FullName, "BuildFlow.slnx")))
            {
                return current;
            }

            current = current.Parent;
        }

        throw new InvalidOperationException("无法定位 BuildFlow.slnx，SOP 合同测试无法确定仓库边界。");
    }
}