Solian/lib/widgets/attachments/attachment_list.dart

import 'dart:ui';

import 'package:carousel_slider/carousel_slider.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:solian/models/attachment.dart';
import 'package:solian/widgets/attachments/attachment_item.dart';
import 'package:solian/providers/content/attachment.dart';
import 'package:solian/widgets/attachments/attachment_list_fullscreen.dart';

class AttachmentList extends StatefulWidget {
  final String parentId;
  final List<int> attachmentsId;

  const AttachmentList(
      {super.key, required this.parentId, required this.attachmentsId});

  @override
  State<AttachmentList> createState() => _AttachmentListState();
}

class _AttachmentListState extends State<AttachmentList> {
  bool _isLoading = true;
  bool _showMature = false;

  double _aspectRatio = 1;

  List<Attachment?> _attachmentsMeta = List.empty();

  void getMetadataList() {
    final AttachmentProvider provider = Get.find();

    if (widget.attachmentsId.isEmpty) {
      return;
    } else {
      _attachmentsMeta = List.filled(widget.attachmentsId.length, null);
    }

    int progress = 0;
    for (var idx = 0; idx < widget.attachmentsId.length; idx++) {
      provider.getMetadata(widget.attachmentsId[idx]).then((resp) {
        progress++;
        _attachmentsMeta[idx] = Attachment.fromJson(resp.body);
        if (progress == widget.attachmentsId.length) {
          setState(() {
            calculateAspectRatio();
            _isLoading = false;
          });
        }
      });
    }
  }

  void calculateAspectRatio() {
    bool isConsistent = true;
    double? consistentValue;
    int portrait = 0, square = 0, landscape = 0;
    for (var entry in _attachmentsMeta) {
      if (entry!.metadata?['ratio'] != null) {
        if (entry.metadata?['ratio'] is int) {
          consistentValue ??= entry.metadata?['ratio'].toDouble();
        } else {
          consistentValue ??= entry.metadata?['ratio'];
        }
        if (isConsistent && entry.metadata?['ratio'] != consistentValue) {
          isConsistent = false;
        }
        if (entry.metadata!['ratio'] > 1) {
          landscape++;
        } else if (entry.metadata!['ratio'] == 1) {
          square++;
        } else {
          portrait++;
        }
      }
    }
    if (isConsistent && consistentValue != null) {
      _aspectRatio = consistentValue;
    } else {
      if (portrait > square && portrait > landscape) {
        _aspectRatio = 9 / 16;
      }
      if (landscape > square && landscape > portrait) {
        _aspectRatio = 16 / 9;
      } else {
        _aspectRatio = 1;
      }
    }
  }

  @override
  void initState() {
    super.initState();

    getMetadataList();
  }

  @override
  Widget build(BuildContext context) {
    if (widget.attachmentsId.isEmpty) {
      return const SizedBox();
    }

    if (_isLoading) {
      return Container(
        decoration: BoxDecoration(
            color: Theme.of(context).colorScheme.surfaceContainerHigh),
        child: const LinearProgressIndicator(),
      );
    }

    return CarouselSlider.builder(
      options: CarouselOptions(
        aspectRatio: _aspectRatio,
        viewportFraction: 1,
        enableInfiniteScroll: false,
      ),
      itemCount: _attachmentsMeta.length,
      itemBuilder: (context, idx, _) {
        final element = _attachmentsMeta[idx];
        return GestureDetector(
          child: Container(
            width: MediaQuery.of(context).size.width,
            decoration: BoxDecoration(
              color: Theme.of(context).colorScheme.surfaceContainerHigh,
            ),
            child: Stack(
              fit: StackFit.expand,
              children: [
                AttachmentItem(
                  parentId: widget.parentId,
                  key: Key('a${element!.uuid}'),
                  item: element,
                  badge: _attachmentsMeta.length > 1
                      ? '${idx + 1}/${_attachmentsMeta.length}'
                      : null,
                  showHideButton: !element.isMature || _showMature,
                  onHide: () {
                    setState(() => _showMature = false);
                  },
                ),
                if (element.isMature && !_showMature)
                  BackdropFilter(
                    filter: ImageFilter.blur(sigmaX: 100, sigmaY: 100),
                    child: Container(
                      decoration: BoxDecoration(
                        color: Colors.black.withOpacity(0.5),
                      ),
                    ),
                  ),
                if (element.isMature && !_showMature)
                  Center(
                    child: Container(
                      constraints: const BoxConstraints(maxWidth: 280),
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          const Icon(Icons.visibility_off,
                              color: Colors.white, size: 32),
                          const SizedBox(height: 8),
                          Text(
                            'matureContent'.tr,
                            style: const TextStyle(
                                color: Colors.white,
                                fontWeight: FontWeight.bold,
                                fontSize: 16),
                          ),
                          Text(
                            'matureContentCaption'.tr,
                            style: const TextStyle(color: Colors.white),
                            textAlign: TextAlign.center,
                          ),
                        ],
                      ),
                    ),
                  ),
              ],
            ),
          ),
          onTap: () {
            if (!_showMature && _attachmentsMeta.any((e) => e!.isMature)) {
              setState(() => _showMature = true);
            } else if (['image'].contains(element.mimetype.split('/').first)) {
              Navigator.of(context, rootNavigator: true).push(
                MaterialPageRoute(
                  builder: (context) => AttachmentListFullScreen(
                    parentId: widget.parentId,
                    attachment: element,
                  ),
                ),
              );
            }
          },
        );
      },
    );
  }
}