import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_slider_drawer/flutter_slider_drawer.dart';
import 'package:get/get.dart';
import 'package:isekai_wiki/api/mw/list.dart';
import 'package:isekai_wiki/api/mw/mw_api.dart';
import 'package:isekai_wiki/api/mw/parse.dart';
import 'package:isekai_wiki/api/response/page_info.dart';
import 'package:isekai_wiki/api/response/parse.dart';
import 'package:isekai_wiki/components/bottom_nav_bar.dart';
import 'package:isekai_wiki/components/nav_bar_button.dart';
import 'package:isekai_wiki/components/safearea_builder.dart';
import 'package:isekai_wiki/components/toc.dart';
import 'package:isekai_wiki/components/wikipage_parser.dart';
import 'package:isekai_wiki/components/isekai_nav_bar.dart';
import 'package:isekai_wiki/components/isekai_page_scaffold.dart';
import 'package:isekai_wiki/global.dart';
import 'package:isekai_wiki/models/favorite_list.dart';
import 'package:isekai_wiki/reactive/reactive.dart';
import 'package:isekai_wiki/utils/dialog.dart';
import 'package:isekai_wiki/utils/error.dart';
import 'package:isekai_wiki/utils/utils.dart';
import 'package:share_plus/share_plus.dart';

class MinimumArticleData {
  final String title;
  final String? description;
  final String? mainCategory;
  final DateTime? updateTime;

  MinimumArticleData({required this.title, this.description, this.mainCategory, this.updateTime});
}

class ArticleCategoryData {
  final String name;
  final String identity;

  ArticleCategoryData({required this.name, required this.identity});
}

class WikiViewPageController extends GetxController {
  WikiPageParserController? parserController;

  var loading = true.obs;

  var menuSlider = GlobalKey<SliderDrawerState>();

  var pageTitle = "".obs;
  var pageId = 0.obs;

  var pageInfo = Rx<PageInfo?>(null);
  var parseInfo = Rx<MWParseInfo?>(null);

  var displayTitle = "".obs;

  var activedSection = "_firstSection".obs;

  bool get hasFirstSection {
    if (parseInfo.value == null) return false;
    if (parseInfo.value!.sections.isEmpty) return false;
    return parseInfo.value!.sections.first.byteoffset == 0;
  }

  @override
  void onInit() {
    super.onInit();
  }

  Future<void> loadPageContent() async {
    if (pageTitle.isNotEmpty || pageId.value != 0) {
      try {
        // 加载页面信息
        loading.value = true;
        MWResponse<List<PageInfo>> pageInfoRes;
        if (pageId.value != 0) {
          pageInfoRes = await MWApiList.getPageInfoList(pageids: [pageId.value]);
        } else {
          pageInfoRes = await MWApiList.getPageInfoList(titles: [pageTitle.value]);
        }
        if (pageInfoRes.data.isEmpty) {
          throw MWApiErrorException(code: 'no-page', info: "页面信息丢失");
        }

        pageInfo.value = pageInfoRes.data[0];
        displayTitle.value = pageInfo.value!.mainTitle;
        pageId.value = pageInfo.value!.pageid;
        pageTitle.value = pageInfo.value!.title;

        // 获取页面HTML
        var parseRes = await MWApiParse.parse(pageId: pageId.value);
        parseInfo.value = parseRes.data;
      } catch (err, stack) {
        alert(Get.overlayContext!, ErrorUtils.getErrorMessage(err), title: "错误");
        if (kDebugMode) {
          print("Exception in page: $err");
          stack.printError();
        }
        loading.value = false;
      }
    }
  }

  void handleFlowButtonClick() {
    alert(Get.overlayContext!, "评论功能暂未完成");
  }

  void handleShareButtonClick() {
    if (pageInfo.value != null) {
      var pageUrl = pageInfo.value!.fullurl ?? getPageUrl(pageInfo.value!.title);
      var shareTitle = "${pageInfo.value!.title} - ${Global.siteTitle}";

      var shareText = "$shareTitle\n$pageUrl";

      Share.share(shareText, subject: shareTitle);
    } else {
      alert(Get.overlayContext!, "页面还未加载完成");
    }
  }

  void handleTOCButtonClick() {
    menuSlider.currentState?.openSlider();
  }

  void handleSwitchTitle(String anchor) {
    menuSlider.currentState?.closeSlider();

    Future.delayed(const Duration(milliseconds: 360)).then((_) {
      activedSection.value = anchor;
    });

    parserController?.scrollToAnchor(anchor);
  }

  void handleSectionChange(String anchor) {
    activedSection.value = anchor;
  }
}

class WikiViewPage extends StatefulWidget {
  final MinimumArticleData? initialArticleData;
  final String? targetPage;
  final int? targetPageId;

  const WikiViewPage({super.key, this.targetPage, this.targetPageId, this.initialArticleData});

  @override
  State<StatefulWidget> createState() => _WikiViewPageState();
}

class _WikiViewPageState extends ReactiveState<WikiViewPage> {
  var c = WikiViewPageController();

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

    Get.put(c);

    c.loadPageContent();
  }

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

    Get.delete<WikiViewPageController>();
  }

  @override
  void receiveProps() {
    c.pageTitle.value = widget.targetPage ?? "";
    c.pageId.value = widget.targetPageId ?? 0;
    c.displayTitle.value = widget.initialArticleData?.title ?? "加载中";
  }

  Widget renderTOC(BuildContext context) {
    return Obx(
      () => TOCList(
        sections: c.parseInfo.value?.sections ?? const [],
        activedItem: c.activedSection.value,
        hasFirstSection: c.hasFirstSection,
        onSwitchTitle: c.handleSwitchTitle,
      ),
    );
  }

  @override
  Widget render(BuildContext context) {
    final flc = Get.find<FavoriteListController>();

    return SliderDrawer(
      key: c.menuSlider,
      isCupertino: true,
      appBar: null,
      showCover: true,
      slideDirection: SlideDirection.RIGHT_TO_LEFT,
      slider: renderTOC(context),
      animationDuration: 350,
      child: IsekaiPageScaffold(
        navigationBar: IsekaiNavigationBar(
          middle: Obx(() => Text(c.displayTitle.value)),
        ),
        bottomNavigationBar: BottomNavigationBar(
          child: Padding(
            padding: const EdgeInsets.all(0),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                NavBarButton(
                  icon: CupertinoIcons.chat_bubble_2,
                  onPressed: c.handleFlowButtonClick,
                  semanticLabel: "讨论",
                ),
                Obx(() {
                  if (c.pageInfo.value != null && flc.isFavorite(c.pageInfo.value!)) {
                    return NavBarButton(
                      icon: CupertinoIcons.heart_fill,
                      onPressed: () {},
                      semanticLabel: "取消收藏",
                    );
                  } else {
                    return NavBarButton(
                      icon: CupertinoIcons.heart,
                      onPressed: () {},
                      semanticLabel: "收藏",
                    );
                  }
                }),
                NavBarButton(
                  icon: CupertinoIcons.share,
                  onPressed: c.handleShareButtonClick,
                  semanticLabel: "分享",
                ),
                NavBarButton(
                  icon: CupertinoIcons.textformat_alt,
                  onPressed: c.handleFlowButtonClick,
                  semanticLabel: "阅读设置",
                ),
                NavBarButton(
                  icon: CupertinoIcons.list_bullet,
                  onPressed: c.handleTOCButtonClick,
                  semanticLabel: "目录",
                ),
              ],
            ),
          ),
        ),
        child: SafeAreaBuilder(
          builder: (context, padding) => Obx(
            () => WikiPageParser(
              padding: padding,
              pageInfo: c.pageInfo.value,
              parseInfo: c.parseInfo.value,
              onSectionChange: c.handleSectionChange,
              ref: (controller) {
                c.parserController = controller;
              },
            ),
          ),
        ),
      ),
    );
  }
}