using System.Text.Json.Nodes;
using Marathon.UI.Services;

namespace Marathon.UI.Tests;

public sealed class JsonSettingsWriterTests : IDisposable
{
    private readonly string _tempPath = Path.Combine(Path.GetTempPath(), $"marathon-settings-{Guid.NewGuid():N}.json");

    [Fact]
    public async Task Save_writes_section_and_creates_file()
    {
        var writer = new JsonSettingsWriter(_tempPath);

        await writer.SaveSectionAsync("Localization", new LocalizationOptions { DefaultCulture = "en-US" });

        File.Exists(_tempPath).Should().BeTrue();
        var json = await File.ReadAllTextAsync(_tempPath);
        json.Should().Contain("\"DefaultCulture\"");
        json.Should().Contain("\"en-US\"");
    }

    [Fact]
    public async Task Save_preserves_other_sections()
    {
        await File.WriteAllTextAsync(_tempPath, "{\"Untouched\":{\"Value\":42}}");

        var writer = new JsonSettingsWriter(_tempPath);
        await writer.SaveSectionAsync("Localization", new LocalizationOptions { DefaultCulture = "ru-RU" });

        var root = await writer.ReadAllAsync();
        root["Untouched"].Should().NotBeNull();
        root["Untouched"]!["Value"]!.GetValue<int>().Should().Be(42);
        root["Localization"]!["DefaultCulture"]!.GetValue<string>().Should().Be("ru-RU");
    }

    [Fact]
    public async Task Reset_removes_section_only()
    {
        var writer = new JsonSettingsWriter(_tempPath);
        await writer.SaveSectionAsync("A", new { X = 1 });
        await writer.SaveSectionAsync("B", new { Y = 2 });

        await writer.ResetSectionAsync("A");

        var root = await writer.ReadAllAsync();
        root.ContainsKey("A").Should().BeFalse();
        root.ContainsKey("B").Should().BeTrue();
    }

    [Fact]
    public async Task Reset_when_file_missing_is_a_no_op()
    {
        var writer = new JsonSettingsWriter(_tempPath);
        await writer.ResetSectionAsync("Anything");
        File.Exists(_tempPath).Should().BeFalse();
    }

    public void Dispose()
    {
        try
        {
            if (File.Exists(_tempPath))
            {
                File.Delete(_tempPath);
            }
        }
        catch
        {
            // best effort
        }
    }
}