SolarAgent/lib/widgets/posts/comments.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'package:infinite_scroll_pagination/infinite_scroll_pagination.dart';
import 'package:solaragent/auth.dart';
import 'package:solaragent/models/feed.dart';
import 'package:solaragent/models/pagination.dart';
import 'package:solaragent/router.dart';
import 'package:solaragent/widgets/feed.dart';

class CommentListWidget extends StatefulWidget {
  final Feed parent;

  const CommentListWidget({super.key, required this.parent});

  @override
  State<CommentListWidget> createState() => _CommentListWidgetState();
}

class _CommentListWidgetState extends State<CommentListWidget> {
  static const pageSize = 5;

  final client = Client();

  final PagingController<int, Feed> paginationController =
      PagingController(firstPageKey: 0);

  List<Feed> feed = List.empty();

  @override
  void initState() {
    super.initState();
    paginationController.addPageRequestListener((pageKey) {
      pullFeed(pageKey);
    });
  }

  Future<void> pullFeed(int pageKey) async {
    var offset = pageKey;
    var take = pageSize;

    var dataset = "${widget.parent.modelType}s";
    var alias = widget.parent.alias;

    var uri = Uri.parse(
      'https://co.solsynth.dev/api/p/$dataset/$alias/comments?take=$take&offset=$offset',
    );

    var res = await client.get(uri);
    if (res.statusCode == 200) {
      final result =
          PaginationResult.fromJson(jsonDecode(utf8.decode(res.bodyBytes)));
      final isLastPage = (result.count - pageKey) < pageSize;
      final items =
          result.data?.map((x) => Feed.fromJson(x)).toList() ?? List.empty();
      if (isLastPage || result.data == null) {
        paginationController.appendLastPage(items);
      } else {
        final nextPageKey = pageKey + items.length;
        paginationController.appendPage(items, nextPageKey);
      }
    } else {
      paginationController.error = utf8.decode(res.bodyBytes);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      children: [
        Container(
          padding: const EdgeInsets.only(left: 10, right: 10, top: 20),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: 8.0,
                  vertical: 12.0,
                ),
                child: Text(
                  'Comments',
                  style: Theme.of(context).textTheme.headlineSmall,
                ),
              ),
              FutureBuilder(
                future: authClient.isAuthorized(),
                builder: (context, snapshot) {
                  if (snapshot.hasData && snapshot.data == true) {
                    return TextButton.icon(
                      icon: const Icon(Icons.edit),
                      label: const Text("LEAVE COMMENT"),
                      onPressed: () {
                        router
                            .push("/post/comments", extra: widget.parent)
                            .then((value) {
                          if (value == true) paginationController.refresh();
                        });
                      },
                    );
                  } else {
                    return Container();
                  }
                },
              ),
            ],
          ),
        ),
        Expanded(
          child: PagedListView<int, Feed>(
            pagingController: paginationController,
            builderDelegate: PagedChildBuilderDelegate<Feed>(
              itemBuilder: (context, item, index) => FeedItem(
                item: item,
              ),
            ),
          ),
        ),
      ],
    );
  }

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