using Serilog;
using Serilog.Core;
using Serilog.Events;
using Serilog.Sinks.SystemConsole.Themes;

namespace BangumiRenamer.Utils;

public sealed class Log
{
    private static readonly Lazy<Log> _instance = new Lazy<Log>(() => new Log());
    private Logger _logger;
    private bool _isInitialized = false;
    private readonly object _lockObject = new object();

    public static Log Instance => _instance.Value;
    public static ILogger Logger => Instance._logger;
    
    private Log() { }

    /// <summary>
    /// 初始化日志配置
    /// </summary>
    public static void Initialize(Action<LoggerConfiguration> configure = null)
    {
        Instance.InitializeInternal(configure);
    }

    private void InitializeInternal(Action<LoggerConfiguration> configure = null)
    {
        lock (_lockObject)
        {
            if (_isInitialized)
            {
                Warn("日志系统已经初始化过");
                return;
            }

            var config = new LoggerConfiguration()
                .MinimumLevel.Debug()
                .WriteTo.Console(
                    outputTemplate: "[{Timestamp:HH:mm:ss}][{Level:u3}] {Message:lj}{NewLine}{Exception}",
                    theme: AnsiConsoleTheme.Sixteen
                )
                .Enrich.FromLogContext()
                .Enrich.WithThreadId();

            configure?.Invoke(config);

            _logger = config.CreateLogger();
            _isInitialized = true;
            
            Info("日志系统初始化完成");
        }
    }

    // 静态快捷方法 - 使用更简短的名称
    public static void Debug(string message, params object[] properties) 
        => Instance.EnsureAndLog(LogEventLevel.Debug, message, properties);
    
    public static void Info(string message, params object[] properties) 
        => Instance.EnsureAndLog(LogEventLevel.Information, message, properties);
    
    public static void Warn(string message, params object[] properties) 
        => Instance.EnsureAndLog(LogEventLevel.Warning, message, properties);
    
    public static void Error(string message, params object[] properties) 
        => Instance.EnsureAndLog(LogEventLevel.Error, message, properties);
    
    public static void Error(Exception ex, string message, params object[] properties) 
        => Instance.EnsureAndLog(ex, message, properties);
    
    public static void Fatal(string message, params object[] properties) 
        => Instance.EnsureAndLog(LogEventLevel.Fatal, message, properties);

    // 实例方法
    private void EnsureAndLog(LogEventLevel level, string message, object[] properties)
    {
        EnsureInitialized();
        _logger.Write(level, message, properties);
    }

    private void EnsureAndLog(Exception ex, string message, object[] properties)
    {
        EnsureInitialized();
        _logger.Error(ex, message, properties);
    }

    /// <summary>
    /// 为特定类型创建Logger
    /// </summary>
    public static ILogger ForContext<T>()
    {
        Instance.EnsureInitialized();
        return Instance._logger.ForContext<T>();
    }

    /// <summary>
    /// 为特定源创建Logger
    /// </summary>
    public static ILogger ForContext(string source)
    {
        Instance.EnsureInitialized();
        return Instance._logger.ForContext("SourceContext", source);
    }

    /// <summary>
    /// 开始一个带属性的日志上下文
    /// </summary>
    public static IDisposable BeginScope(string propertyName, object value)
    {
        Instance.EnsureInitialized();
        return Serilog.Context.LogContext.PushProperty(propertyName, value);
    }

    /// <summary>
    /// 开始多个属性的日志上下文
    /// </summary>
    public static IDisposable BeginScope(params (string Name, object Value)[] properties)
    {
        Instance.EnsureInitialized();
        var disposables = properties.Select(p => 
            Serilog.Context.LogContext.PushProperty(p.Name, p.Value)).ToArray();
        return new DisposableGroup(disposables);
    }

    /// <summary>
    /// 关闭并刷新日志
    /// </summary>
    public static void Close()
    {
        Instance._logger?.Dispose();
        Serilog.Log.CloseAndFlush();
        Instance._isInitialized = false;
    }

    private void EnsureInitialized()
    {
        if (!_isInitialized)
        {
            InitializeInternal();
        }
    }

    // 辅助类：用于同时释放多个IDisposable
    private class DisposableGroup : IDisposable
    {
        private readonly IDisposable[] _disposables;
        
        public DisposableGroup(IDisposable[] disposables)
        {
            _disposables = disposables;
        }
        
        public void Dispose()
        {
            foreach (var disposable in _disposables)
            {
                disposable?.Dispose();
            }
        }
    }
}