import 'dart:io';

import 'package:flutter/material.dart';
import 'package:syncfusion_flutter_pdfviewer/pdfviewer.dart';

import '../app_progress_indicator.dart';

/// SfPdfViewer asserts on `localToGlobal` if mounted during the page-push
/// animation. Defer until the route enter animation completes.
class DeferredPdfViewer extends StatefulWidget {
  const DeferredPdfViewer({super.key, required this.path});
  final String path;

  @override
  State<DeferredPdfViewer> createState() => _DeferredPdfViewerState();
}

class _DeferredPdfViewerState extends State<DeferredPdfViewer> {
  bool _ready = false;
  Animation<double>? _routeAnimation;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (_ready || _routeAnimation != null) return;
    final animation = ModalRoute.of(context)?.animation;
    if (animation == null || animation.isCompleted) {
      _ready = true;
      return;
    }
    _routeAnimation = animation..addStatusListener(_onAnimationStatus);
  }

  void _onAnimationStatus(AnimationStatus status) {
    if (status == AnimationStatus.completed && mounted) {
      setState(() => _ready = true);
    }
  }

  @override
  void dispose() {
    _routeAnimation?.removeStatusListener(_onAnimationStatus);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    if (!_ready) {
      return const Center(child: AppProgressIndicator.large());
    }
    return SfPdfViewer.file(File(widget.path));
  }
}