import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';

enum ToastType { info, success, error, warning }

abstract final class AppToast {
  static OverlayEntry? _current;

  static void show(
    BuildContext context,
    String message, {
    ToastType type = ToastType.info,
    Duration duration = const Duration(seconds: 4),
  }) {
    _current?.remove();
    _current = null;

    final overlay = Overlay.of(context, rootOverlay: true);
    late OverlayEntry entry;
    entry = OverlayEntry(
      builder: (_) => _ToastBanner(
        message: message,
        type: type,
        duration: duration,
        onDismiss: () {
          entry.remove();
          if (_current == entry) _current = null;
        },
      ),
    );
    _current = entry;
    overlay.insert(entry);
  }
}

class _ToastBanner extends StatefulWidget {
  const _ToastBanner({
    required this.message,
    required this.type,
    required this.duration,
    required this.onDismiss,
  });

  final String message;
  final ToastType type;
  final Duration duration;
  final VoidCallback onDismiss;

  @override
  State<_ToastBanner> createState() => _ToastBannerState();
}

class _ToastBannerState extends State<_ToastBanner>
    with SingleTickerProviderStateMixin {
  late final AnimationController _ctrl;
  late final Animation<Offset> _slide;
  late final Animation<double> _fade;
  Timer? _timer;

  @override
  void initState() {
    super.initState();
    _ctrl = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 280),
    );
    _slide = Tween<Offset>(
      begin: const Offset(0, -1.2),
      end: Offset.zero,
    ).animate(CurvedAnimation(parent: _ctrl, curve: Curves.easeOutCubic));
    _fade = CurvedAnimation(parent: _ctrl, curve: Curves.easeOut);

    unawaited(_ctrl.forward());
    _timer = Timer(widget.duration, _dismiss);
  }

  void _dismiss() {
    _timer?.cancel();
    unawaited(_ctrl.reverse().then((_) => widget.onDismiss()));
  }

  @override
  void dispose() {
    _timer?.cancel();
    _ctrl.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final (accentColor, icon) = switch (widget.type) {
      ToastType.success =>
        (const Color(0xFF34C759), Icons.check_circle_outline_rounded),
      ToastType.error =>
        (const Color(0xFFFF3B30), Icons.error_outline_rounded),
      ToastType.warning =>
        (const Color(0xFFFF9F0A), Icons.warning_amber_rounded),
      ToastType.info =>
        (const Color(0xFF6B63D9), Icons.info_outline_rounded),
    };

    final topPadding = MediaQuery.of(context).padding.top;

    return Positioned(
      top: topPadding + 10.h,
      left: 16.w,
      right: 16.w,
      child: SlideTransition(
        position: _slide,
        child: FadeTransition(
          opacity: _fade,
          child: Material(
            elevation: 12,
            shadowColor: Colors.black26,
            borderRadius: BorderRadius.circular(14.r),
            color: Colors.white,
            child: ClipRRect(
              borderRadius: BorderRadius.circular(14.r),
              child: IntrinsicHeight(
                child: Row(
                  crossAxisAlignment: CrossAxisAlignment.stretch,
                  children: [
                    Container(width: 4.w, color: accentColor),
                    Expanded(
                      child: Padding(
                        padding: EdgeInsets.symmetric(
                          horizontal: 14.w,
                          vertical: 13.h,
                        ),
                        child: Row(
                          children: [
                            Icon(icon, color: accentColor, size: 20.sp),
                            SizedBox(width: 10.w),
                            Expanded(
                              child: Text(
                                widget.message,
                                style: TextStyle(
                                  color: const Color(0xFF1C1C1E),
                                  fontSize: 14.sp,
                                  fontWeight: FontWeight.w500,
                                  height: 1.4,
                                ),
                              ),
                            ),
                            SizedBox(width: 8.w),
                            GestureDetector(
                              onTap: _dismiss,
                              behavior: HitTestBehavior.opaque,
                              child: Padding(
                                padding: EdgeInsets.all(4.w),
                                child: Icon(
                                  Icons.close_rounded,
                                  color: const Color(0xFFAEAEB2),
                                  size: 16.sp,
                                ),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ),
      ),
    );
  }
}