using System.IO;
using System.Text.Json;
using WindowsGotify.Models;

namespace WindowsGotify.Services;

public sealed class ConfigService
{
    private readonly Logger _logger;
    private readonly string _configPath;
    private readonly JsonSerializerOptions _options = new()
    {
        WriteIndented = true
    };

    public ConfigService(Logger logger)
    {
        _logger = logger;
        var dir = Path.Combine(
            Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
            "WindowsGotify");

        Directory.CreateDirectory(dir);
        _configPath = Path.Combine(dir, "config.json");
    }

    public async Task<AppConfig> LoadAsync()
    {
        if (!File.Exists(_configPath))
        {
            var config = new AppConfig();
            await SaveAsync(config);
            _logger.Warn($"Created default config: {_configPath}");
            return config;
        }

        try
        {
            await using var stream = File.OpenRead(_configPath);
            return await JsonSerializer.DeserializeAsync<AppConfig>(stream, _options)
                   ?? new AppConfig();
        }
        catch (Exception ex)
        {
            _logger.Error("Config load failed; using default config.", ex);
            return new AppConfig();
        }
    }

    public async Task SaveAsync(AppConfig config)
    {
        await using var stream = File.Create(_configPath);
        await JsonSerializer.SerializeAsync(stream, config, _options);
    }

    public string GetConfigPath() => _configPath;
}