import 'package:PiliPlus/common/widgets/custom_icon.dart';
import 'package:PiliPlus/common/widgets/loading_widget/loading_widget.dart';
import 'package:PiliPlus/http/loading_state.dart';
import 'package:PiliPlus/models/topic_pub_search/topic_item.dart';
import 'package:PiliPlus/pages/dynamics_select_topic/controller.dart';
import 'package:PiliPlus/utils/extension.dart';
import 'package:PiliPlus/utils/utils.dart';
import 'package:easy_debounce/easy_throttle.dart';
import 'package:flutter/material.dart';
import 'package:get/get.dart';

class SelectTopicPanel extends StatefulWidget {
  const SelectTopicPanel({
    super.key,
    this.scrollController,
  });

  final ScrollController? scrollController;

  @override
  State<SelectTopicPanel> createState() => _SelectTopicPanelState();
}

class _SelectTopicPanelState extends State<SelectTopicPanel> {
  final _controller = Get.put(SelectTopicController());

  @override
  void initState() {
    super.initState();
    if (_controller.loadingState.value is Error) {
      _controller.onReload();
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    return Column(
      children: [
        InkWell(
          onTap: Get.back,
          borderRadius: const BorderRadius.only(
            topLeft: Radius.circular(18),
            topRight: Radius.circular(18),
          ),
          child: Container(
            height: 35,
            padding: const EdgeInsets.only(bottom: 2),
            child: Center(
              child: Container(
                width: 32,
                height: 3,
                decoration: BoxDecoration(
                  color: theme.colorScheme.outline,
                  borderRadius: const BorderRadius.all(Radius.circular(3)),
                ),
              ),
            ),
          ),
        ),
        Padding(
          padding: const EdgeInsets.only(left: 16, right: 16, bottom: 5),
          child: TextField(
            controller: _controller.controller,
            onChanged: (value) {
              EasyThrottle.throttle(
                'topicPubSearch',
                const Duration(milliseconds: 300),
                () => _controller
                  ..enableClear.value = value.isNotEmpty
                  ..onRefresh()
                      .whenComplete(() => widget.scrollController?.jumpToTop()),
              );
            },
            decoration: InputDecoration(
              border: const OutlineInputBorder(
                gapPadding: 0,
                borderSide: BorderSide.none,
                borderRadius: BorderRadius.all(
                  Radius.circular(25),
                ),
              ),
              isDense: true,
              filled: true,
              fillColor: theme.colorScheme.onInverseSurface,
              hintText: '搜索话题',
              hintStyle: const TextStyle(fontSize: 14),
              prefixIcon: const Padding(
                padding: EdgeInsets.only(left: 12, right: 4),
                child: Icon(Icons.search, size: 20),
              ),
              prefixIconConstraints:
                  const BoxConstraints(minHeight: 0, minWidth: 0),
              contentPadding:
                  const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
              suffixIcon: Obx(
                () => _controller.enableClear.value
                    ? Padding(
                        padding: const EdgeInsets.only(right: 12),
                        child: GestureDetector(
                          child: Container(
                            padding: const EdgeInsetsDirectional.all(2),
                            decoration: BoxDecoration(
                              shape: BoxShape.circle,
                              color: theme.colorScheme.secondaryContainer,
                            ),
                            child: Icon(
                              Icons.clear,
                              size: 16,
                              color: theme.colorScheme.onSecondaryContainer,
                            ),
                          ),
                          onTap: () => _controller
                            ..enableClear.value = false
                            ..controller.clear()
                            ..onRefresh().whenComplete(
                                () => widget.scrollController?.jumpToTop()),
                        ),
                      )
                    : const SizedBox.shrink(),
              ),
              suffixIconConstraints:
                  const BoxConstraints(minHeight: 0, minWidth: 0),
            ),
          ),
        ),
        Expanded(
          child: Material(
            color: Colors.transparent,
            child: Obx(() => _buildBody(theme, _controller.loadingState.value)),
          ),
        ),
      ],
    );
  }

  Widget _buildBody(
      ThemeData theme, LoadingState<List<TopicPubSearchItem>?> loadingState) {
    return switch (loadingState) {
      Loading() => loadingWidget,
      Success<List<TopicPubSearchItem>?>(:var response) =>
        response?.isNotEmpty == true
            ? ListView.builder(
                padding: EdgeInsets.only(
                  bottom: MediaQuery.paddingOf(context).bottom +
                      MediaQuery.viewInsetsOf(context).bottom +
                      80,
                ),
                controller: widget.scrollController,
                itemBuilder: (context, index) {
                  if (index == response.length - 1) {
                    _controller.onLoadMore();
                  }
                  final item = response[index];
                  return ListTile(
                    dense: true,
                    onTap: () => Get.back(result: item),
                    title: Text.rich(
                      TextSpan(
                        children: [
                          const WidgetSpan(
                            alignment: PlaceholderAlignment.middle,
                            child: Padding(
                              padding: EdgeInsets.only(right: 5),
                              child: Icon(
                                CustomIcon.topic_tag,
                                size: 18,
                              ),
                            ),
                          ),
                          TextSpan(
                            text: item.name,
                            style: const TextStyle(fontSize: 14),
                          ),
                        ],
                      ),
                    ),
                    subtitle: Padding(
                      padding: const EdgeInsets.only(left: 23),
                      child: Text(
                        '${Utils.numFormat(item.view)}浏览 · ${Utils.numFormat(item.discuss)}讨论',
                        style: TextStyle(color: theme.colorScheme.outline),
                      ),
                    ),
                  );
                },
                itemCount: response!.length,
              )
            : scrollErrorWidget(
                controller: widget.scrollController,
                onReload: _controller.onReload,
              ),
      Error(:var errMsg) => scrollErrorWidget(
          errMsg: errMsg,
          controller: widget.scrollController,
          onReload: _controller.onReload,
        ),
    };
  }
}