lift-app/lib/internal/search/page/search_page.dart

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:liftmanager/internal/bbs/model/banner_model.dart';
import 'package:liftmanager/internal/bbs/model/hot_search_model.dart';
import 'package:liftmanager/internal/search/page/search_index.dart';
import 'package:liftmanager/internal/search/presenter/base_list_provider.dart';
import 'package:liftmanager/net/api_service.dart';
import 'package:liftmanager/res/iconfont.dart';
import 'package:liftmanager/utils/toast.dart';
import 'package:liftmanager/widgets/bbs_content.dart';
import 'package:liftmanager/widgets/load_image.dart';
import 'package:liftmanager/widgets/search_app_bar.dart';
import 'package:shared_preferences/shared_preferences.dart';

class SearchPage extends StatefulWidget {
  @override
  SearchPageState createState() => SearchPageState();
}

class SearchPageState extends State<SearchPage> {
  String searchText;
  bool showSearchResult = false;
  String noText = "";
  List<dynamic> newsList;
  List<dynamic> questionList;
  List<dynamic> videoList;
  List<dynamic> goodsList;
  List<dynamic> positionList;
  List<dynamic> aggregatedData;
  var selectedListType = ListType.all;
  var searchHistories = <String>[];
  var searchHistoriesUnique = <String>{};
  List<HotSearchModel> hotSearches;


  BaseListProvider<Records> provider = BaseListProvider<Records>();

  @override
  initState() {
    super.initState();
    getSearchHistories();
    getHotSearchList();
  }

  Future getSearchHistories() async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      searchHistories.addAll(prefs.getStringList('searchHistory') ?? []);
    });
  }

  Future saveSearchHistories(String newSearchString) async {
    searchHistories.insert(0, newSearchString);

    if (searchHistories.length > 10) {
      searchHistories = searchHistories.sublist(0, 9);
    }

    for (var h in searchHistories) {
      searchHistoriesUnique.add(h);
    }

    final prefs = await SharedPreferences.getInstance();
    return prefs.setStringList('searchHistory', searchHistoriesUnique.toList());
  }

  Future clearSearchHistories() async {
    searchHistories.clear();

    final prefs = await SharedPreferences.getInstance();
    return prefs.remove('searchHistory');
  }

  Future getHotSearchList() async {
    await NewApiService().getSearchHot(onSuccess: (res) {
      setState(() {
        hotSearches = res;
      });
    }, onError: (code, msg) {
      toasts(msg);
    });
  }

  Future getSearchList(text) async {
    await NewApiService().getSearchIndex(text, onSuccess: (res) {
      showSearchResult = true;
      questionList = null;
      videoList = null;
      goodsList = null;
      positionList = null;
      newsList = null;

      if (res.length > 0) {
        saveSearchHistories(text);

        res.forEach((item) {
          if (item.code == "1") {
            questionList = item.infoList.take(3).toList();
          } else if (item.code == "2") {
            videoList = item.infoList.take(3).toList();
          } else if (item.code == "3") {
            goodsList = item.infoList.take(3).toList();
          } else if (item.code == "4") {
            positionList = item.infoList.take(3).toList();
          } else if (item.code == "5") {
            newsList = item.infoList.take(3).toList();
          }
        });
        print(JsonEncoder().convert(res));
        print(JsonEncoder().convert(questionList));
        print("questionList");
        print(JsonEncoder().convert(videoList));
        print("videoList");
        print(JsonEncoder().convert(goodsList));
        print("goodsList");
        print(JsonEncoder().convert(positionList));
        print("positionList");
        setState(() {
          aggregatedData = [
            [newsList, '新闻', ListType.news],
            [videoList, '视频', ListType.video],
            [questionList, '问答', ListType.question],
            [goodsList, '商品', ListType.goods],
            [positionList, '职位', ListType.position]
          ];
        });
      } else {
        setState(() {
          noText = "暂无数据";
        });
      }
    }, onError: (code, msg) {
      toasts(msg);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: SearchAppBar(
        hintText: "输入搜索内容",
        searchText: searchText,
        onPressed: (text) {
          if (text.isEmpty) {
            toasts("搜索关键字不能为空！");
            return;
          }
          setState(() {
            searchText = text;
          });
          aggregatedData = null;
          getSearchList(text);

          FocusScope.of(context).unfocus();
        },
      ),
      body: LayoutBuilder(
        builder: (context, constraints) => Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            if (showSearchResult && aggregatedData != null) ...[
              FilterHeader(
                activeIndex: selectedListType.index,
                filterNameList:
                    aggregatedData.map<String>((e) => e[1] as String).toList(),
                onTap: (index) {
                  setState(() {
                    selectedListType = ListType.values[index];
                  });
                },
              ),
              Container(
                color: Color(0xffF9F9F9),
                height: 5,
              ),
              Container(
                height: constraints.maxHeight - 50,
                child: selectedListType == ListType.all
                    ? ListView(
                        children: [
                          if (selectedListType == ListType.all) ...listAll()
                        ],
                      )
                    : SearchIndex(selectedListType, searchText),
              ),
            ],
            if (aggregatedData == null &&
                searchHistories != null &&
                !showSearchResult) ...[
              SizedBox(
                height: 10,
              ),
              Row(
                children: [
                  CommonSectionHeader(title: '搜索历史'),
                  Spacer(),
                  GestureDetector(
                    child: Icon(
                      Iconfont.shanchu1,
                      color: Color(0xff6A6A76),
                      size: 16,
                    ),
                    onTap: () {
                      setState(() {
                        clearSearchHistories();
                      });
                    },
                  ),
                  SizedBox(
                    width: 10,
                  ),
                ],
              ),
              SizedBox(
                height: 10,
              ),
              Expanded(
                child: historicalSearchSection(),
              ),
              SizedBox(
                height: 10,
              ),
              CommonSectionHeader(title: '热门搜索'),
              if (hotSearches != null)
                Expanded(
                  flex: 3,
                  child: hotSearchSection(),
                ),
              SizedBox(
                height: 10,
              ),
            ],
            if (showSearchResult && aggregatedData == null)
              Center(child: Text(noText))
          ],
        ),
      ),
    );
  }

  List<Widget> listAll() {
    return [
      for (var e in aggregatedData)
        if (e[0] != null && (e[0] as List).length > 0)
          Column(children: [
            SectionHeader(
              title: e[1],
            ),
            if (e[2] == ListType.news)
              Container(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: HotNews(newsList: e[0]),
              ),
            if (e[2] == ListType.video)
              Container(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: Column(
                  children: HotClass(videoList: e[0]).listVideo(context),
                ),
              ),
            if (e[2] == ListType.question)
              Container(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: HotQuestion(initList: e[0]),
              ),
            if (e[2] == ListType.goods)
              Container(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: HotProduct(productList: e[0]),
              ),
            if (e[2] == ListType.position)
              Container(
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: HotPosition(positionList: e[0]),
              ),
            GestureDetector(
              onTap: () {
                setState(() {
                  selectedListType = e[2];
                });
              },
              child: Container(
                height: 40,
                padding: EdgeInsets.symmetric(horizontal: 10),
                child: Row(children: [
                  Icon(
                    Iconfont.sousuo,
                    color: Color(0xff6A6A76),
                    size: 16,
                  ),
                  SizedBox(
                    width: 10,
                  ),
                  Expanded(
                    child: Text(
                      '更多相关${e[1]}',
                      style: TextStyle(
                        color: Color(0xff9A9A9A),
                        fontSize: 14,
                      ),
                    ),
                  ),
                  Icon(
                    Iconfont.gengduo,
                    size: 11,
                    color: Colors.grey,
                  ),
                ]),
              ),
            ),
            Container(
              color: Color(0xffF9F9F9),
              height: 5,
            ),
          ])
    ];
  }

  Widget historicalSearchSection() {
    List<LayoutId> widgetList = [];

    for (var i = 0; i < searchHistories.length; i++) {
      widgetList.add(
        LayoutId(
          id: i,
          child: GestureDetector(
            onTap: () {
              setState(() {
                searchText = searchHistories[i];
              });
              getSearchList(searchHistories[i]);
            },
            child: Container(
              padding: EdgeInsets.all(10),
              decoration: BoxDecoration(
                color: Color(0xffF4F8FA),
                borderRadius: BorderRadius.all(Radius.circular(16)),
              ),
              child: Text(
                searchHistories[i],
                style: TextStyle(color: Color(0xff666666), fontSize: 13),
              ),
            ),
          ),
        ),
      );
    }

    return CustomMultiChildLayout(
      children: widgetList,
      delegate: SearchHistorySectionLayoutDelegate(
          widgetList.map<int>((e) => e.id).toList()),
    );
  }

  Widget hotSearchSection() {
    return Container(
      margin: EdgeInsets.all(10),
      padding: EdgeInsets.all(10),
      decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.all(
            Radius.circular(5),
          ),
          boxShadow: [
            BoxShadow(
              color: Colors.grey.withOpacity(0.2),
              spreadRadius: 1,
              blurRadius: 3,
              offset: Offset(0, 0), // changes position of shadow
            ),
          ]),
      child: ListView.builder(
          itemCount: hotSearches.length > 10 ? 10 : hotSearches.length,
          itemBuilder: (context, index) {
            return SizedBox(
              height: 35,
              child: GestureDetector(
              onTap: (){
                setState(() {
                  searchText = hotSearches[index].keyword;
                });
                getSearchList(hotSearches[index].keyword);
              }, child: Row(
                children: [
                  if (index == 0) LoadAssetImage('icon_crown_golden'),
                  if (index == 1) LoadAssetImage('icon_crown_silver'),
                  if (index == 2) LoadAssetImage('icon_crown_bronze'),
                  if (index > 2) LoadAssetImage('icon_number_${index + 1}'),
                  SizedBox(width: 10),
                  Text(
                    hotSearches[index].keyword,
                    style: TextStyle(
                      fontSize: 13,
                      color: Color(0xff666666),
                    ),
                  ),
                  Spacer(),
                  if (index == 0)
                    Icon(
                      Iconfont.remen,
                      size: 14,
                      color: Color(0xffF95046),
                    ),
                  if (index == 1)
                    Icon(
                      Iconfont.remen,
                      size: 14,
                      color: Color(0xffFDAF2C),
                    ),
                  if (index == 2)
                    Icon(
                      Iconfont.remen,
                      size: 14,
                      color: Color(0xffFEE455),
                    ),
                  SizedBox(width: 10),
                ],
              ),
            ),);
          }),
    );
  }
}

class SearchHistorySectionLayoutDelegate extends MultiChildLayoutDelegate {
  List<int> childIds;

  SearchHistorySectionLayoutDelegate(this.childIds);

  @override
  void performLayout(Size size) {
    Size leaderSize = Size.zero;

    const spacing = 10.0;
    const rightMargin = 10.0;
    var offset = Offset.zero;

    for (var id in childIds) {
      if (hasChild(id)) {
        offset = Offset(offset.dx + leaderSize.width + spacing, offset.dy);

        leaderSize = layoutChild(
          id,
          BoxConstraints.loose(size),
        );

        if (size.width - offset.dx - leaderSize.width <= rightMargin) {
          offset = Offset(spacing, offset.dy + leaderSize.height + spacing);
        }

        positionChild(id, offset);
      }
    }
  }

  @override
  bool shouldRelayout(covariant MultiChildLayoutDelegate oldDelegate) {
    return false;
  }
}