using System.Text.RegularExpressions;

namespace TarninaHub.Tests.Architecture;

/// <summary>
/// Guarantees that data contracts never expose object-valued dictionaries.
/// Such dictionaries break CBOR deserialization of SurrealDB rows and force
/// lossy conversions, so only string-valued maps are allowed.
/// </summary>
public class NoObjectValuedDictionariesTests
{
    private static readonly Regex Forbidden = new(@"Dictionary<string,\s*object", RegexOptions.Compiled);

    [Fact]
    public void DataContracts_MustNotUseObjectValuedDictionaries()
    {
        var root = FindRepositoryRoot();
        var files = new List<string>();

        foreach (var directory in new[]
                 {
                     Path.Combine(root, "backend", "Application", "Dtos"),
                     Path.Combine(root, "backend", "Application", "Abstractions"),
                     Path.Combine(root, "backend", "Domain"),
                 })
        {
            files.AddRange(Directory.GetFiles(directory, "*.cs", SearchOption.AllDirectories));
        }

        files.AddRange(Directory.GetFiles(
            Path.Combine(root, "backend", "Infrastructure", "Persistence"),
            "*Row.cs",
            SearchOption.AllDirectories));

        var offenders = files
            .Where(file => Forbidden.IsMatch(File.ReadAllText(file)))
            .Select(file => Path.GetRelativePath(root, file))
            .OrderBy(path => path, StringComparer.Ordinal)
            .ToList();

        Assert.True(
            offenders.Count == 0,
            "Object-valued dictionaries are forbidden in data contracts. " +
            "Use string-valued maps instead:\n" + string.Join(Environment.NewLine, offenders));
    }

    private static string FindRepositoryRoot()
    {
        var directory = new DirectoryInfo(AppContext.BaseDirectory);

        while (directory is not null && !File.Exists(Path.Combine(directory.FullName, "TarninaHub.slnx")))
        {
            directory = directory.Parent;
        }

        Assert.NotNull(directory);

        return directory!.FullName;
    }
}