using System.Text.Json;
using Xunit;

namespace StellaOps.Notifier.Tests;

public sealed class AttestationTemplateCoverageTests
{
    private static readonly string RepoRoot = LocateRepoRoot();

    [Fact]
    public void Attestation_templates_cover_required_channels()
    {
        var directory = Path.Combine(RepoRoot, "offline", "notifier", "templates", "attestation");
        Assert.True(Directory.Exists(directory), $"Expected template directory at {directory}");

        var templates = Directory
            .GetFiles(directory, "*.template.json")
            .Select(path => new
            {
                Path = path,
                Document = JsonDocument.Parse(File.ReadAllText(path)).RootElement
            })
            .ToList();

        var required = new Dictionary<string, string[]>
        {
            ["tmpl-attest-verify-fail"] = new[] { "slack", "email", "webhook" },
            ["tmpl-attest-expiry-warning"] = new[] { "email", "slack" },
            ["tmpl-attest-key-rotation"] = new[] { "email", "webhook" },
            ["tmpl-attest-transparency-anomaly"] = new[] { "slack", "webhook" }
        };

        foreach (var pair in required)
        {
            var matches = templates.Where(t => t.Document.GetProperty("key").GetString() == pair.Key);
            var channels = matches
                .Select(t => t.Document.GetProperty("channelType").GetString() ?? string.Empty)
                .ToHashSet(StringComparer.OrdinalIgnoreCase);

            var missing = pair.Value.Where(requiredChannel => !channels.Contains(requiredChannel)).ToArray();
            Assert.True(missing.Length == 0, $"{pair.Key} missing channels: {string.Join(", ", missing)}");
        }
    }

    [Fact]
    public void Attestation_templates_include_schema_and_locale_metadata()
    {
        var directory = Path.Combine(RepoRoot, "offline", "notifier", "templates", "attestation");
        Assert.True(Directory.Exists(directory), $"Expected template directory at {directory}");

        foreach (var path in Directory.GetFiles(directory, "*.template.json"))
        {
            var document = JsonDocument.Parse(File.ReadAllText(path)).RootElement;

            Assert.True(document.TryGetProperty("schemaVersion", out var schemaVersion) && !string.IsNullOrWhiteSpace(schemaVersion.GetString()), $"schemaVersion missing for {Path.GetFileName(path)}");
            Assert.True(document.TryGetProperty("locale", out var locale) && !string.IsNullOrWhiteSpace(locale.GetString()), $"locale missing for {Path.GetFileName(path)}");
            Assert.True(document.TryGetProperty("key", out var key) && !string.IsNullOrWhiteSpace(key.GetString()), $"key missing for {Path.GetFileName(path)}");
        }
    }

    private static string LocateRepoRoot()
    {
        var directory = AppContext.BaseDirectory;
        while (directory != null)
        {
            var candidate = Path.Combine(directory, "offline", "notifier", "templates", "attestation");
            if (Directory.Exists(candidate))
            {
                return directory;
            }

            directory = Directory.GetParent(directory)?.FullName;
        }

        throw new InvalidOperationException("Unable to locate repository root containing offline/notifier/templates/attestation.");
    }
}