import 'dart:convert';

import 'package:flutter/services.dart';
import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:image_picker/image_picker.dart';
import 'package:twongCustomer/routes/utils.dart';
import 'package:twongCustomer/utils/loading.dart';

import '../utils/http.dart';
import '../utils/cache.dart';
import '../utils/emoji.dart';
import '../models/index.dart';
import '../utils/events.dart';
import '../utils/size_fit.dart';

class ChatPage extends StatefulWidget{
  final UserInfo user;
  ChatPage(this.user, {Key key}): super(key: key);

  @override
  State<StatefulWidget> createState() {
    return _ChatPageState();
  }
}

class _ChatPageState extends State<ChatPage> with WidgetsBindingObserver {
  UserInfo user;
  FocusNode _inputFocus = new FocusNode();
  List<List<String>> emojis = new List<List<String>>();
  List<HttpMessage> _messageList = new List<HttpMessage>();
  ScrollController _scrollController = new ScrollController();
  TextEditingController _textController = new TextEditingController();

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);

    initData();
    initEventListener();
    Events.fire(ClearUnread(widget.user.uid));
  }

  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    print("--" + state.toString());
    switch (state) {
      case AppLifecycleState.inactive: // 处于这种状态的应用程序应该假设它们可能在任何时候暂停。
        break;
      case AppLifecycleState.resumed:// 应用程序可见，前台
        break;
      case AppLifecycleState.paused: // 应用程序不可见，后台
        break;
      case AppLifecycleState.detached:
        break;
    }
  }

  @override
  void dispose() {
    super.dispose();
    print("chat dispose");
  }

  void initData() {
    initEmojis();
    user = AppData.get("info");

    // Loading.show(context);
    Http.getHistory(widget.user.uid).then((list) {
      if (!mounted) return;
      setState(() {
        _messageList = list;
      });
      Loading.hide(context);
    }).catchError((err) {
      Loading.hide(context);
      Fluttertoast.showToast(msg: "获取聊天记录失败");
      print("history err: " + err.toString());
    });
  }

  void initEmojis() {
    var idx = 1;
    var page = 0;
    emojis.add(new List<String>());
    for(var item in EmojiConf.list) {
      emojis[page].add(item);
      if(idx % 24 == 0){
        page++;
        emojis.add(new List<String>());
      }
      idx++;
    }
  }

  void initEventListener() {
    Events.on<UserMessage>().listen((event) {
      if(!mounted) return;
      setState(() {
        _messageList.add(event.message);
        _scrollController.animateTo(0,
          duration: const Duration(milliseconds: 300),
          curve: Curves.easeOut,
        );
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: true,
      appBar: AppBar(
        centerTitle: true,
        title: Text(widget.user.username),
        actions: [
          IconButton(icon: Icon(Icons.more_horiz_outlined, size: 34), onPressed: () {
            RouterUtils.toUserInfo(context, widget.user);
          }),
          Container(width: 6)
        ],
      ),
      body: SafeArea(
          child: ListView(children: <Widget>[
            Container(
              height: 500,
              child: ListView.builder(
                  reverse: true,
                  controller: _scrollController,
                  physics: BouncingScrollPhysics(),
                  itemCount: _messageList.length,
                  itemBuilder: (context, i) {
                    return _buildMessage(i);
                  },
                ),
              ),
            // Divider(height: 1.0),
            _buildComposer(),
          ]),
        )
      );
  }

  Widget _buildAvatar(String url) {
    return Container(
        padding: EdgeInsets.only(top: 4),
        child: ClipRRect(
            borderRadius: BorderRadius.circular(20),
            child: Image.network(url, width: 40, height: 40)
        ));
  }

  Widget _buildMsgBody(bool visitor, HttpMessage msg) {
    // print("build msg: " + user.toJson().toString());
    return Flexible(child: Container(
      margin: EdgeInsets.only(left: 10, right: 10),
      child: Column(
        crossAxisAlignment: visitor ? CrossAxisAlignment.start : CrossAxisAlignment
            .end,
        children: [
          Text(visitor ? msg.visitor_name : user.name, textAlign: TextAlign.right,),
          Container(
              margin: EdgeInsets.only(top: 6),
              padding: EdgeInsets.all(10),
              decoration: BoxDecoration(
                  color: _getBackground(visitor, msg),
                  borderRadius: BorderRadius.all(Radius.circular(20))
              ),
              child: _buildMsgContent(msg)
          )
        ],
      ),
    ));
  }

  Color _getBackground(bool visitor, HttpMessage msg) {
    if(msg.content.startsWith("face[")) {
      return visitor ? Colors.cyanAccent : Colors.greenAccent;
    }

    if(msg.content.startsWith("img[")) {
      return null;
    }

    if(msg.content.startsWith("product[")) {
      return Colors.white70;
    }

    if(msg.content.startsWith("order[")) {
      return null;
    }

    return visitor ? Colors.cyanAccent : Colors.greenAccent;
  }

  Widget _buildMsgContent(HttpMessage msg) {
    if(msg.content.startsWith("face[")) {
      var name = msg.content.substring(5, msg.content.length - 1);
      return Container( height: 32, width: 32, child: Image.asset("assets/emojis/" + name + ".png"));
    }

    if(msg.content.startsWith("img[")) {
      var url = msg.content.substring(4, msg.content.length - 1);
      return Image.network(url);
    }

    if(msg.content.startsWith("product[")) {
      var url = msg.content.substring(8, msg.content.length - 1);
      print(url);
      var product = Product.fromJson(json.decode(url));
      return _buildProduct(product);
    }

    if(msg.content.startsWith("order[")) {
      var url = msg.content.substring(6, msg.content.length - 1);
      print(url);
      var order = Order.fromJson(json.decode(url));
      return _buildOrder(order);
    }

    return Text(msg.content);
  }

  Widget _buildOrder(Order order) {
    return Container(
        padding: EdgeInsets.all(10.px),
        decoration: BoxDecoration(
            color: Colors.white,
            borderRadius: BorderRadius.circular(4.px)
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text("订单号："),
            Row(
              children: [
                Expanded(child: Text(order.order_id, style: TextStyle(decoration:
                  TextDecoration.underline, fontWeight: FontWeight.bold))),
                GestureDetector(
                  onTap: () {
                    Clipboard.setData(ClipboardData(text: order.order_id))
                        .then((value) => Fluttertoast.showToast(msg: "复制成功！"));
                  },
                  child: Container(
                    padding: EdgeInsets.only(left: 8.px,right: 8.px, top: 2.px, bottom: 2.px),
                    decoration: BoxDecoration(
                        color: Colors.blue,
                        borderRadius: BorderRadius.circular(4.px)
                    ),
                    child: Text("复制", style: TextStyle(color: Colors.white)),
                  ),
                )
              ],
            )
          ],
        ));
  }

  Widget _buildProduct(Product product) {
    return Container(
      padding: EdgeInsets.all(4.px),
      child: Column(
        children: [
          Image.network(product.image),
          Text(product.store_name, style: TextStyle(fontWeight: FontWeight.bold)),
          Row(
            children: [
              Expanded(child: RichText(
                text: TextSpan(
                  text: "会员价：",
                    style: TextStyle(color: Colors.black, fontSize: 14.px),
                  children: [
                    TextSpan(
                      text: "￥",
                      style: TextStyle(color: Colors.black, fontSize: 12.px),
                    ),
                    TextSpan(
                        text: product.vip_price,
                        style: TextStyle(color: Colors.red, fontSize: 16.px)
                    )
                  ]
                ),
              )),
              Expanded(child: RichText(
                text: TextSpan(
                    text: "售价：",
                    style: TextStyle(color: Colors.black, fontSize: 14.px),
                    children: [
                      TextSpan(
                        text: "￥",
                        style: TextStyle(color: Colors.black, fontSize: 12.px),
                      ),
                      TextSpan(
                          text: product.price,
                          style: TextStyle(color: Colors.red, fontSize: 16.px)
                      )
                    ]
                ),
              )),
            ],
          )
        ],
      ),
    );
  }

  Widget _buildMessage(idx) {
    var msg = _messageList[_messageList.length - idx - 1];
    var visitor = msg.mes_type == "visitor";
    var customer = AppData.get("info") as UserInfo;
    // print(msg.toJson());
    return Container(
      padding: EdgeInsets.all(10),
      alignment: visitor ? Alignment.topLeft : Alignment.topRight,
      child: visitor ? Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.start,
        children: [
          _buildAvatar(visitor ? msg.visitor_avator : customer.avator),
          _buildMsgBody(visitor, msg)
        ],
      ): Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisAlignment: MainAxisAlignment.end,
        children: [
          _buildMsgBody(visitor, msg),
          _buildAvatar(customer.avator)
        ],
      )
    );
  }

  Widget _buildComposer() {
    return Container(
      alignment: Alignment.center,
      height: 45.0,
      width: double.infinity,
      margin: EdgeInsets.all(3.0),
      child: Row(
        children: <Widget>[
          IconButton(icon: Icon(
            Icons.emoji_emotions, color: Colors.black26, size: 30,),
              onPressed: _openFaces),
          Expanded(
            child: TextField(
              focusNode: _inputFocus,
              textInputAction: TextInputAction.send,
              controller: _textController,
              onSubmitted: _submitMsg,
              decoration: InputDecoration(
                contentPadding: EdgeInsets.all(10.0),
                hintText: "想说点儿什么？",
                fillColor: Colors.white,
                filled: true,
                border: OutlineInputBorder(
                  borderSide: BorderSide.none,
                  borderRadius: BorderRadius.all(Radius.circular(5)),
                ),
              ),
            ),
          ),
          IconButton(
            icon: Icon(Icons.add_circle_outline),
            onPressed: _openAction,
            color: Colors.black26,
          ),
        ],
      ),
    );
  }

  void _submitMsg(String txt) async {
    var tem = _textController.text;
    _textController.text = "";
    FocusScope.of(context).requestFocus(_inputFocus);
    await Http.sendMsg(widget.user.uid, txt).then((res) {
      var msg = HttpMessage();
      msg.content = txt;
      Events.fire(UserMessage(msg));
    }).catchError((err) {
      print(err);
      _textController.text = tem;
      Fluttertoast.showToast(msg: "发送失败!");
    });
  }

  void _submitFace(String name) async {
    var code = "face[$name]";
    await Http.sendMsg(widget.user.uid, code).then((res) {
      var msg = HttpMessage();
      msg.content = code;
      Events.fire(UserMessage(msg));
      Navigator.pop(context);
    }).catchError((err) {
      print(err);
      Fluttertoast.showToast(msg: "发送失败!");
    });
  }

  Widget _getAvatar(String name) {
    return InkWell(onTap: () => _submitFace(name), child: CircleAvatar(child:
      Container(child: Image.asset("assets/emojis/" + name + ".png"),
        margin: EdgeInsets.all(8)), radius: 20, backgroundColor: Colors.transparent));
  }

  Future _openFaces () {
    var pageWidgets = List<Widget>();
    for(var item in emojis) {
      var faceWidgets = List<Widget>();
      for(var face in item) {
        faceWidgets.add(_getAvatar(face));
      }
      pageWidgets.add(GridView(
        gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
            crossAxisCount: 8, //横轴三个子widget
            childAspectRatio: 1 //宽高比为1时，子widget
        ),
        children: faceWidgets,
      ));
    }

    return showModalBottomSheet(
        context: context,
        isScrollControlled: true,
        builder: (BuildContext context) {
          return Container(
            height: 160,
            child: PageView(
              children: pageWidgets,
            ),
          );
        });
  }

  Future _openAction() {
    return showModalBottomSheet(
        context: context,
        builder: (BuildContext context) {
          return SafeArea(child: Column(
            mainAxisSize: MainAxisSize.min,
            children: <Widget>[
              new ListTile(
                leading: Icon(Icons.photo_camera),
                title: Text("相机拍摄"),
                onTap: () async {
                  var image = await ImagePicker.pickImage(
                      source: ImageSource.camera);
                  Navigator.pop(context);
                },
              ),
              new ListTile(
                leading: Icon(Icons.photo_library),
                title: Text("照片库"),
                onTap: () async {
                  var image = await ImagePicker.pickImage(
                      source: ImageSource.gallery);
                  Navigator.pop(context);
                },
              ),
            ],
          ));
        });
  }
}