didvan-app/lib/views/home/media/widgets/banner_grid_view.dart

import 'package:didvan/config/design_config.dart';
import 'package:didvan/config/theme_data.dart';
import 'package:didvan/views/home/infography/infography_screen_state.dart';
import 'package:didvan/views/home/main/widgets/infography_item.dart';
import 'package:didvan/views/widgets/state_handlers/state_handler.dart';
import 'package:didvan/views/widgets/shimmer_placeholder.dart';
import 'package:didvan/views/widgets/didvan/card.dart';
import 'package:didvan/views/widgets/didvan/divider.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'package:provider/provider.dart';

class BannerGridView extends StatefulWidget {
  const BannerGridView({super.key});

  @override
  State<BannerGridView> createState() => _BannerGridViewState();
}

class _BannerGridViewState extends State<BannerGridView> {
  int _visibleItemCount = 4;
  final ScrollController _scrollController = ScrollController();
  int pageNumber = 1;

  @override
  void initState() {
    super.initState();
    Future.microtask(() {
      context.read<InfographyScreenState>().init();
    });
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Consumer<InfographyScreenState>(
      builder: (context, state, child) {
        return StateHandler<InfographyScreenState>(
          placeholder: Column(
            children: [
              _buildPlaceholder(),
              const SizedBox(height: 8.0),
              _buildPlaceholder(),
            ],
          ),
          topPadding: 0,
          onRetry: () => state.init(),
          state: state,
          builder: (context, state) {
            final contents = state.contents;

            final itemsToShow = _visibleItemCount > contents.length
                ? contents.length
                : _visibleItemCount;

            final hasMoreItems = itemsToShow < contents.length;

            return Column(
              children: [
                _buildCategoryFilters(state),
                const SizedBox(height: 16),
                ListView.separated(
                  shrinkWrap: true,
                  physics: const NeverScrollableScrollPhysics(),
                  padding: const EdgeInsets.all(8.0),
                  itemCount: itemsToShow,
                  separatorBuilder: (context, index) =>
                      const SizedBox(height: 8.0),
                  itemBuilder: (context, index) {
                    final item = contents[index];
                    return InfographyItem(
                      id: item.id,
                      onMarkChanged: (id, value, _) =>
                          state.changeMark(id, value),
                      image: item.image,
                      category: item.category,
                      createdAt: item.createdAt,
                      title: item.title,
                      tag: item.tags,
                      marked: item.marked,
                      liked: item.liked,
                      onLikedChanged: (id, value, _) =>
                          state.changeLiked(id, value),
                      likes: item.likes,
                    );
                  },
                ),
                if (hasMoreItems)
                  Padding(
                    padding: const EdgeInsets.symmetric(vertical: 16.0),
                    child: GestureDetector(
                      onTap: () {
                        setState(() {
                          _visibleItemCount += 4;
                        });
                      },
                      child: Container(
                        padding: const EdgeInsets.symmetric(
                          horizontal: 50.0,
                          vertical: 12.0,
                        ),
                        decoration: BoxDecoration(
                          color: const Color.fromARGB(255, 0, 126, 167),
                          borderRadius: BorderRadius.circular(15),
                        ),
                        child: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            SvgPicture.asset(
                              'lib/assets/icons/element-plus.svg',
                            ),
                            const SizedBox(width: 8),
                            const Text(
                              'بارگذاری بیشتر',
                              style: TextStyle(
                                color: Colors.white,
                                fontSize: 14,
                                fontWeight: FontWeight.bold,
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
              ],
            );
          },
        );
      },
    );
  }

  Widget _buildCategoryFilters(InfographyScreenState state) {
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      padding: const EdgeInsets.symmetric(horizontal: 8.0),
      child: Row(
        children: [
          Padding(
            padding: const EdgeInsets.only(left: 8.0),
            child: FilterChip(
              label: const Padding(
                padding: EdgeInsets.all(1.0),
                child: Text('همه'),
              ),
              selected: state.selectedCats.isEmpty,
              onSelected: (selected) {
                if (selected) {
                  state.selectedCats.clear();
                  state.getInfographyContent(page: 1);
                  setState(() {
                    _visibleItemCount = 4;
                  });
                }
              },
              selectedColor: const Color.fromARGB(255, 200, 224, 244),
              backgroundColor: state.selectedCats.isEmpty
                  ? DesignConfig.isDark
                      ? const Color.fromARGB(255, 30, 30, 30)
                      : const Color.fromARGB(255, 200, 224, 244)
                  : DesignConfig.isDark
                      ? const Color.fromARGB(255, 61, 61, 61)
                      : const Color.fromARGB(255, 224, 224, 224),
              labelStyle: TextStyle(
                color: state.selectedCats.isEmpty
                    ? const Color.fromARGB(255, 0, 115, 153)
                    : Theme.of(context).colorScheme.caption,
                fontWeight: state.selectedCats.isEmpty
                    ? FontWeight.bold
                    : FontWeight.normal,
              ),
              shape: RoundedRectangleBorder(
                borderRadius: BorderRadius.circular(24),
              ),
              showCheckmark: false,
            ),
          ),
          ...state.categories.map((category) {
            final isSelected = state.selectedCats.contains(category);

            return Padding(
              padding: const EdgeInsets.only(left: 8.0),
              child: FilterChip(
                label: Padding(
                  padding: const EdgeInsets.all(1.0),
                  child: Text(category.label),
                ),
                selected: isSelected,
                onSelected: (selected) {
                  if (selected) {
                    state.selectedCats.add(category);
                  } else {
                    state.selectedCats.remove(category);
                  }
                  state.getInfographyContent(page: 1);
                  setState(() {
                    _visibleItemCount = 4;
                  });
                },
                selectedColor: const Color.fromARGB(255, 200, 224, 244),
                backgroundColor: isSelected
                    ? DesignConfig.isDark
                        ? const Color.fromARGB(255, 30, 30, 30)
                        : const Color.fromARGB(255, 200, 224, 244)
                    : DesignConfig.isDark
                        ? const Color.fromARGB(255, 61, 61, 61)
                        : const Color.fromARGB(255, 224, 224, 224),
                labelStyle: TextStyle(
                  color: isSelected
                      ? const Color.fromARGB(255, 0, 115, 153)
                      : Theme.of(context).colorScheme.caption,
                  fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
                ),
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(24),
                ),
                showCheckmark: false,
              ),
            );
          }).toList(),
        ],
      ),
    );
  }

  Widget _buildPlaceholder() {
    return const DidvanCard(
      padding: EdgeInsets.all(8),
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              ShimmerPlaceholder(
                height: 16,
                width: 240,
              ),
            ],
          ),
          SizedBox(height: 12),
          ShimmerPlaceholder(height: 200, width: 400),
          SizedBox(height: 12),
          Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              ShimmerPlaceholder(
                height: 32,
                width: 100,
              ),
            ],
          ),
          DidvanDivider(
            verticalPadding: 12,
          ),
          ShimmerPlaceholder(
            height: 16,
            width: double.infinity,
          ),
        ],
      ),
    );
  }
}