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

import '../../../shared/widgets/smart_image.dart';


class AndroidDetailBanner extends StatefulWidget {
  const AndroidDetailBanner({
    super.key,
    required this.scrollProgress,
    required this.backdropUrl,
    required this.fallbackUrls,
    this.embyBaseUrl = '',
    this.imageHeaders,
  });

  final ValueListenable<double> scrollProgress;
  final String backdropUrl;
  final List<String> fallbackUrls;
  final String embyBaseUrl;
  final Map<String, String>? imageHeaders;

  @override
  State<AndroidDetailBanner> createState() => _AndroidDetailBannerState();
}

class _AndroidDetailBannerState extends State<AndroidDetailBanner> {
  bool _allImagesFailed = false;

  @override
  void didUpdateWidget(covariant AndroidDetailBanner oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.backdropUrl != widget.backdropUrl ||
        !listEquals(oldWidget.fallbackUrls, widget.fallbackUrls)) {
      _allImagesFailed = false;
    }
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      fit: StackFit.expand,
      children: [
        if (!_allImagesFailed)
          ShaderMask(
            shaderCallback: (bounds) => const LinearGradient(
              begin: Alignment.topCenter,
              end: Alignment.bottomCenter,
              stops: [0.0, 0.68, 1.0],
              colors: [Colors.black, Colors.black, Colors.transparent],
            ).createShader(bounds),
            blendMode: BlendMode.dstIn,
            child: SmartImage(
              url: widget.backdropUrl,
              fallbackUrls: widget.fallbackUrls,
              fit: BoxFit.cover,
              alignment: Alignment.center,
              borderRadius: 0,
              placeholder: const SizedBox.expand(),
              onError: () {
                if (mounted && !_allImagesFailed) {
                  setState(() => _allImagesFailed = true);
                }
              },
              resolveHttpHeaders: (url) =>
                  widget.embyBaseUrl.isNotEmpty &&
                      url.startsWith(widget.embyBaseUrl)
                  ? widget.imageHeaders
                  : null,
            ),
          ),
        Positioned(
          top: 0,
          left: 0,
          right: 0,
          height: 120,
          child: IgnorePointer(
            child: DecoratedBox(
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  begin: Alignment.topCenter,
                  end: Alignment.bottomCenter,
                  colors: [
                    Colors.black.withValues(alpha: 0.38),
                    Colors.transparent,
                  ],
                ),
              ),
            ),
          ),
        ),
        Positioned.fill(
          child: ValueListenableBuilder<double>(
            valueListenable: widget.scrollProgress,
            builder: (context, rawProgress, child) {
              final progress = rawProgress.clamp(0.0, 1.0);
              return IgnorePointer(
                child: ColoredBox(
                  color: Colors.black.withValues(alpha: progress * 0.5),
                ),
              );
            },
          ),
        ),
      ],
    );
  }
}