import 'dart:typed_data';

import 'package:flutter/material.dart';
import 'package:rra_app/pages/map/tiles/hive_tile_cache.dart';

class HiveTileImage extends StatefulWidget {
  const HiveTileImage({required this.url, this.onLoaded, super.key});

  final String url;
  final ValueChanged<String>? onLoaded;

  @override
  State<HiveTileImage> createState() => _HiveTileImageState();
}

class _HiveTileImageState extends State<HiveTileImage> {
  Uint8List? _bytes;
  String? _loadingUrl;
  bool _reportedLoaded = false;

  @override
  void initState() {
    super.initState();
    _bytes = HiveTileCache.peek(widget.url);
    if (_bytes != null && _bytes!.isNotEmpty) {
      _reportLoaded();
    } else {
      _load(widget.url);
    }
  }

  @override
  void didUpdateWidget(covariant HiveTileImage oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.url != widget.url) {
      _reportedLoaded = false;
      _bytes = HiveTileCache.peek(widget.url);
      if (_bytes != null && _bytes!.isNotEmpty) {
        _reportLoaded();
      } else {
        _load(widget.url);
      }
    }
  }

  Future<void> _load(String url) async {
    _loadingUrl = url;
    final bytes = await HiveTileCache.getOrFetch(url);
    if (!mounted || _loadingUrl != url) return;
    if (bytes != null && bytes.isNotEmpty) {
      setState(() {
        _bytes = bytes;
      });
      _reportLoaded();
    }
  }

  void _reportLoaded() {
    if (_reportedLoaded) return;
    _reportedLoaded = true;
    widget.onLoaded?.call(widget.url);
  }

  @override
  Widget build(BuildContext context) {
    final bytes = _bytes;
    if (bytes == null || bytes.isEmpty) {
      return const ColoredBox(color: Colors.transparent);
    }
    _reportLoaded();
    return Image.memory(
      bytes,
      scale: widget.url.contains('@2x') ? 2.0 : 1.0,
      fit: BoxFit.cover,
      gaplessPlayback: true,
      filterQuality: FilterQuality.medium,
    );
  }
}