using System;
using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace CommonwealthOnline.Host.Services;

// Mirrors CommonwealthOnline.Server Configuration. Keep the JSON shape aligned
// with the server's own serializer so a config saved here loads there.
public sealed class ServerConfig
{
    public string Host { get; set; } = "0.0.0.0";
    public int Port { get; set; } = 7777;
    public string ServerName { get; set; } = "Commonwealth Online Server";
    public string ServerDescription { get; set; } = string.Empty;
    public int MaxPlayers { get; set; } = 16;
    public string LogVerbosity { get; set; } = "info";
    public int AdminPort { get; set; } = 7779;
    public bool EnableGnsTransport { get; set; }
    public string? GnsBridgePath { get; set; }

    private static readonly JsonSerializerOptions Options = new()
    {
        WriteIndented = true,
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
    };

    public static ServerConfig Load(string path)
    {
        try
        {
            if (File.Exists(path))
            {
                return JsonSerializer.Deserialize<ServerConfig>(File.ReadAllText(path), Options)
                       ?? new ServerConfig();
            }
        }
        catch (Exception)
        {
            // Fall back to defaults on unreadable/invalid config.
        }

        return new ServerConfig();
    }

    public void Save(string path) =>
        File.WriteAllText(path, JsonSerializer.Serialize(this, Options));
}