using System.Text.Json;

namespace HanaToolbox.Config;

public sealed class ConfigService
{
    private const string ConfigDir = "/etc/hanatoolbox";
    private const string ConfigFile = "/etc/hanatoolbox/hanatoolbox.json";

    public static AppConfig Load()
    {
        if (!File.Exists(ConfigFile))
            return new AppConfig();

        try
        {
            var json = File.ReadAllText(ConfigFile);
            return JsonSerializer.Deserialize(json, AppConfigJsonContext.Default.AppConfig)
                   ?? new AppConfig();
        }
        catch (Exception ex)
        {
            throw new InvalidOperationException(
                $"Failed to load config from {ConfigFile}: {ex.Message}", ex);
        }
    }

    public static void Save(AppConfig config)
    {
        Directory.CreateDirectory(ConfigDir);
        Directory.CreateDirectory(StateDirectory);

        var json = JsonSerializer.Serialize(config, AppConfigJsonContext.Default.AppConfig);
        File.WriteAllText(ConfigFile, json);
    }

    public static bool Exists() => File.Exists(ConfigFile);

    public static string StateDirectory => "/etc/hanatoolbox/state";
}