using System.Text.Json;
using GhostImageManager.Models;

namespace GhostImageManager.Services;

public class GhostConfigService
{
    private readonly string _configPath;
    private readonly object _lock = new();

    public GhostConfigService(IWebHostEnvironment env)
    {
        _configPath = Path.Combine(env.ContentRootPath, "ghost-instances.json");
    }

    public GhostConfig Load()
    {
        if (!File.Exists(_configPath))
        {
            var empty = new GhostConfig();
            Save(empty);
            return empty;
        }

        var json = File.ReadAllText(_configPath);
        return JsonSerializer.Deserialize<GhostConfig>(json, GetOptions()) ?? new GhostConfig();
    }

    public void Save(GhostConfig config)
    {
        lock (_lock)
        {
            var json = JsonSerializer.Serialize(config, GetOptions());
            File.WriteAllText(_configPath, json);
        }
    }

    private static JsonSerializerOptions GetOptions() => new()
    {
        WriteIndented = true,
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase
    };
}