using System.Text.Json;
using ClaudeDo.Localization;

namespace ClaudeDo.Localization.Tests;

public class EnJsonCoverageTests
{
    private static string LocalesDir()
    {
        var dir = AppContext.BaseDirectory;
        while (dir is not null)
        {
            var candidate = Path.Combine(dir, "src", "ClaudeDo.Localization", "locales");
            if (Directory.Exists(candidate)) return candidate;
            dir = Path.GetDirectoryName(dir);
        }
        throw new DirectoryNotFoundException("Could not locate src/ClaudeDo.Localization/locales");
    }

    [Fact]
    public void All_locale_files_parse_as_valid_json()
    {
        var localesDir = LocalesDir();
        foreach (var path in Directory.EnumerateFiles(localesDir, "*.json"))
        {
            try
            {
                JsonDocument.Parse(File.ReadAllText(path));
            }
            catch (JsonException ex)
            {
                Assert.Fail($"{Path.GetFileName(path)} is not valid JSON: {ex.Message}");
            }
        }
    }

    [Fact]
    public void Every_locale_has_same_keys_as_english()
    {
        var localesDir = LocalesDir();
        var jsonFileCount = Directory.EnumerateFiles(localesDir, "*.json").Count();
        var store = LocaleStore.Load(localesDir);
        Assert.True(store.Available.Count == jsonFileCount,
            $"Expected {jsonFileCount} locale(s) to load from {localesDir}, but only {store.Available.Count} loaded " +
            $"(loaded: {string.Join(", ", store.Available.Select(l => l.Code))}). A *.json file failed to parse.");
        Assert.True(store.TryGet("de", out _), "Locale 'de' did not load — de.json failed to parse.");

        Assert.True(store.TryGet("en", out var en));
        var enKeys = en!.Strings.Keys.ToHashSet();

        foreach (var locale in store.Available)
        {
            var keys = locale.Strings.Keys.ToHashSet();
            var missing = enKeys.Except(keys).OrderBy(k => k).ToList();
            var extra = keys.Except(enKeys).OrderBy(k => k).ToList();
            Assert.True(missing.Count == 0,
                $"Locale '{locale.Code}' missing keys: {string.Join(", ", missing)}");
            Assert.True(extra.Count == 0,
                $"Locale '{locale.Code}' has extra keys not in en.json: {string.Join(", ", extra)}");
        }
    }
}