import 'dart:async';

import 'package:flutter/material.dart';
import 'package:recording_tool/app/router/app_navigator.dart';

class AppToast {
  AppToast._();

  static OverlayEntry? _entry;
  static Timer? _timer;

  static String messageOf(Object? error) {
    if (error == null) return '未知错误';
    if (error is FormatException) return error.message;
    if (error is TimeoutException) return error.message ?? '请求超时';

    var text = error.toString().trim();
    const prefix = 'Exception: ';
    while (text.startsWith(prefix)) {
      text = text.substring(prefix.length).trimLeft();
    }
    return text.isEmpty ? '未知错误' : text;
  }

  static void show(
    String message, {
    Duration duration = const Duration(seconds: 2),
  }) {
    final context = AppNavigator.context;
    if (context == null) return;

    _dismiss();
    final overlay = Overlay.maybeOf(context, rootOverlay: true);
    if (overlay == null) return;

    _entry = OverlayEntry(builder: (_) => _ToastWidget(message: message));
    overlay.insert(_entry!);
    _timer = Timer(duration, _dismiss);
  }

  static void showError(Object error) => show(messageOf(error));

  static void _dismiss() {
    _timer?.cancel();
    _timer = null;
    try {
      _entry?.remove();
    } catch (_) {
      // OverlayEntry may already be removed.
    }
    _entry = null;
  }
}

class _ToastWidget extends StatelessWidget {
  const _ToastWidget({required this.message});

  final String message;

  @override
  Widget build(BuildContext context) {
    return Positioned.fill(
      child: IgnorePointer(
        child: Center(
          child: Material(
            color: Colors.transparent,
            child: Container(
              constraints: BoxConstraints(
                maxWidth: MediaQuery.sizeOf(context).width * 0.8,
              ),
              padding: const EdgeInsets.symmetric(horizontal: 18, vertical: 11),
              decoration: BoxDecoration(
                color: Colors.black.withValues(alpha: 0.82),
                borderRadius: BorderRadius.circular(8),
              ),
              child: Text(
                message,
                textAlign: TextAlign.center,
                style: const TextStyle(color: Colors.white, fontSize: 14),
              ),
            ),
          ),
        ),
      ),
    );
  }
}