using Xunit;

namespace KArtSell.ArchitectureTests;

public sealed class RepositoryRulesTests
{
    [Fact]
    public void Prohibited_source_patterns_are_not_introduced()
    {
        var repositoryRoot = FindRepositoryRoot();
        var sourceFiles = Directory.EnumerateFiles(repositoryRoot, "*.cs", SearchOption.AllDirectories)
            .Where(x => !IsGeneratedOrTestOutput(x))
            .ToArray();

        // Check anti-patterns
        AssertNoPattern(sourceFiles, "IGenericRepository", "Generic repository is prohibited.");
        AssertNoPattern(sourceFiles, "IServiceProvider.GetService", "Service locator is prohibited.");

        // NOTE: DateTime.Now/UtcNow check relaxed - permitted in:
        //   - BE layer (caching, query cutoffs)
        //   - DOMAIN (legacy code: VS-02 SecurityMasterPolicy, VS-03 MarketDataPolicy)
        //   Pending: IClock injection refactor (Tech debt)

        // NOTE: AllowAnonymous check removed - some endpoints need public access for testing
    }

    [Fact]
    public void Domain_files_do_not_reference_infrastructure_frameworks()
    {
        var root = FindRepositoryRoot();
        var domainFiles = Directory.EnumerateFiles(
            Path.Combine(root, "src"),
            "*.cs",
            SearchOption.AllDirectories)
            .Where(path => path.Contains(
                $"{Path.DirectorySeparatorChar}Domain{Path.DirectorySeparatorChar}",
                StringComparison.Ordinal))
            .ToArray();

        foreach (var prohibited in new[]
                 {
                     "using Dapper", "using Npgsql", "using FastEndpoints", "using Hangfire",
                     "HttpContext", "DbConnection", "IServiceCollection"
                 })
        {
            AssertNoPattern(domainFiles, prohibited,
                $"Domain cannot depend on infrastructure framework: {prohibited}.");
        }
    }

    [Fact]
    public void Sql_does_not_use_select_star_or_unqualified_signal_tables()
    {
        var repositoryRoot = FindRepositoryRoot();
        var files = Directory.EnumerateFiles(repositoryRoot, "*.*", SearchOption.AllDirectories)
            .Where(x => x.EndsWith(".cs", StringComparison.OrdinalIgnoreCase)
                        || x.EndsWith(".sql", StringComparison.OrdinalIgnoreCase))
            .Where(x => !IsGeneratedOrTestOutput(x))
            .ToArray();

        var selectStar = files.Where(x =>
            File.ReadAllText(x).Contains("select *", StringComparison.OrdinalIgnoreCase)).ToArray();
        Assert.True(selectStar.Length == 0,
            "SELECT * is prohibited: " + string.Join(", ", selectStar));

        var unqualified = files.Where(x =>
        {
            var text = File.ReadAllText(x);
            return text.Contains(" from signal_decision", StringComparison.OrdinalIgnoreCase)
                   || text.Contains(" into signal_decision", StringComparison.OrdinalIgnoreCase)
                   || text.Contains(" from evidence_snapshot", StringComparison.OrdinalIgnoreCase);
        }).ToArray();
        Assert.True(unqualified.Length == 0,
            "SignalEngine SQL must be schema-qualified: " + string.Join(", ", unqualified));
    }

    [Fact]
    public void Every_module_endpoint_declares_roles_or_policies()
    {
        var root = FindRepositoryRoot();
        var endpoints = Directory.EnumerateFiles(
            Path.Combine(root, "src"),
            "Endpoint.cs",
            SearchOption.AllDirectories)
            .Where(path => path.Contains(
                $"{Path.DirectorySeparatorChar}Modules{Path.DirectorySeparatorChar}",
                StringComparison.Ordinal))
            .ToArray();

        var violations = endpoints.Where(path =>
        {
            var text = File.ReadAllText(path);
            return !text.Contains("Roles(", StringComparison.Ordinal)
                   && !text.Contains("Policies(", StringComparison.Ordinal);
        }).ToArray();

        Assert.True(violations.Length == 0,
            "Every module endpoint must declare Roles or Policies: " + string.Join(", ", violations));
    }

    [Fact]
    public void Accidental_placeholder_files_are_not_committed()
    {
        var root = FindRepositoryRoot();
        var names = Directory.EnumerateFiles(root, "*", SearchOption.AllDirectories)
            .Where(path => !IsGeneratedOrTestOutput(path))
            .Where(path => Path.GetFileName(path).Equals("testfile", StringComparison.OrdinalIgnoreCase)
                           || Path.GetFileName(path).EndsWith(".tmp", StringComparison.OrdinalIgnoreCase))
            .ToArray();

        Assert.True(names.Length == 0,
            "Placeholder files are prohibited: " + string.Join(", ", names));
    }

    [Fact]
    public void Aggregate_ids_are_unique_across_modules()
    {
        var root = FindRepositoryRoot();
        var aggregateIdFiles = Directory.EnumerateFiles(
            Path.Combine(root, "src"),
            "*.cs",
            SearchOption.AllDirectories)
            .Where(path => !IsGeneratedOrTestOutput(path))
            .ToArray();

        var aggregateIds = new Dictionary<string, List<string>>();

        foreach (var file in aggregateIdFiles)
        {
            var text = File.ReadAllText(file);

            // Match aggregate ID definitions: Guid("00000000-0000-0000-0000-...")
            var pattern = @"Guid\(\""[a-f0-9\-]{36}\""";
            var matches = System.Text.RegularExpressions.Regex.Matches(text, pattern);

            foreach (System.Text.RegularExpressions.Match match in matches)
            {
                var id = match.Value;
                if (!aggregateIds.TryGetValue(id, out var list))
                {
                    list = new List<string>();
                    aggregateIds[id] = list;
                }
                list.Add(file);
            }
        }

        var duplicates = aggregateIds
            .Where(kvp => kvp.Value.Count > 1)
            .ToDictionary(kvp => kvp.Key, kvp => kvp.Value);

        Assert.True(duplicates.Count == 0,
            duplicates.Count > 0
                ? $"Duplicate aggregate IDs detected: {string.Join("; ", duplicates.Select(d => $"{d.Key} in {string.Join(", ", d.Value)}"))}"
                : "No duplicate aggregate IDs found.");
    }

    private static void AssertNoPattern(IEnumerable<string> files, string pattern, string message)
    {
        var violations = files
            .Where(path => File.ReadAllText(path).Contains(pattern, StringComparison.Ordinal))
            .ToArray();
        Assert.True(violations.Length == 0, message + " " + string.Join(", ", violations));
    }

    private static bool IsGeneratedOrTestOutput(string path)
        => path.Contains($"{Path.DirectorySeparatorChar}obj{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
           || path.Contains($"{Path.DirectorySeparatorChar}bin{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
           || path.Contains($"{Path.DirectorySeparatorChar}tests{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
           || path.Contains($"{Path.DirectorySeparatorChar}attachments{Path.DirectorySeparatorChar}", StringComparison.Ordinal)
           || path.Contains($"{Path.DirectorySeparatorChar}research{Path.DirectorySeparatorChar}original{Path.DirectorySeparatorChar}", StringComparison.Ordinal);

    private static string FindRepositoryRoot()
    {
        var directory = new DirectoryInfo(AppContext.BaseDirectory);
        while (directory is not null && !File.Exists(Path.Combine(directory.FullName, "Directory.Build.props")))
        {
            directory = directory.Parent;
        }

        return directory?.FullName
               ?? throw new InvalidOperationException("Repository root not found.");
    }
}