import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:image_picker/image_picker.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:zhiying_base_widget/pages/feedback_page/feedback_record_page.dart';
import 'package:zhiying_base_widget/pages/feedback_page/widgets/feedback_image.dart';
import 'package:zhiying_base_widget/pages/feedback_page/widgets/feedback_tab_widget.dart';
import 'package:zhiying_base_widget/widgets/others/action_selected_alert/action_selected_alert.dart';
import 'package:zhiying_comm/util/log/let_log.dart';

class FeedbackPage extends StatefulWidget {
  @override
  _FeedbackPageState createState() => _FeedbackPageState();
}

class _FeedbackPageState extends State<FeedbackPage> {
  List<File> _images = List();
  bool _submitable = false;
  TextEditingController _feedback = TextEditingController();

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      resizeToAvoidBottomInset: false,
      appBar: _createNav(),
      body: GestureDetector(
        onTap: () {
          FocusScope.of(context).requestFocus(FocusNode());
        },
        child: SafeArea(
          child: Column(
            children: <Widget>[
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    children: <Widget>[
                      Container(
                        width: double.infinity,
                        margin: EdgeInsets.only(
                            top: 10, bottom: 10, left: 12.5, right: 12.5),
                        padding: EdgeInsets.all(12.5),
                        decoration: BoxDecoration(
                            color: Colors.white,
                            borderRadius: BorderRadius.circular(7.5)),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          mainAxisAlignment: MainAxisAlignment.start,
                          children: <Widget>[
                            _createTitle(),
                            _createUpload(),
                            _createSubmit(),
                          ],
                        ),
                      )
                    ],
                  ),
                ),
              ),
              Center(
                child: GestureDetector(
                  behavior: HitTestBehavior.opaque,
                  onTap: () {
                    Navigator.push(
                      context,
                      CupertinoPageRoute(
                        builder: (_) => FeedbackRecordPage(),
                      ),
                    );
                  },
                  child: Container(
                    width: 120,
                    height: 30,
                    margin: EdgeInsets.all(10),
                    decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(15)),
                    child: Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      crossAxisAlignment: CrossAxisAlignment.center,
                      children: <Widget>[
                        Padding(
                          padding: EdgeInsets.only(right: 6),
                          child: Icon(
                            Icons.list,
                            size: 12,
                          ),
                        ),
                        Text(
                          '反馈记录',
                          style:
                              TextStyle(fontSize: 13, color: Color(0xff333333)),
                        )
                      ],
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  // 导航栏
  Widget _createNav() {
    return CupertinoNavigationBar(
      border: Border(
        bottom: BorderSide(
          width: 0.0, // One physical pixel.
          style: BorderStyle.none,
        ),
      ),
      backgroundColor: Colors.white,
      leading: Navigator.canPop(context)
          ? GestureDetector(
              child: Container(
                padding: EdgeInsets.zero,
                child: Icon(
                  Icons.arrow_back_ios,
                  size: 20,
                ),
              ),
              onTap: () {
                if (Navigator.canPop(context)) {
                  Navigator.pop(context);
                }
              },
            )
          : Container(),
      middle: Text(
        '意见反馈',
        style: TextStyle(
          fontSize: 15,
          color: Color(0xff333333),
        ),
      ),
    );
  }

  Widget _createTitle() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisAlignment: MainAxisAlignment.start,
      children: <Widget>[
        Text(
          '反馈描述',
          style: TextStyle(
            fontSize: 14,
            color: Color(0xff333333),
            fontWeight: FontWeight.bold,
          ),
        ),
        Padding(
          padding: EdgeInsets.only(top: 4, bottom: 4),
          child: Row(
            children: List.generate(
                3,
                (index) => Expanded(
                      child: Container(
                          margin: EdgeInsets.only(left: 2, right: 2),
                          height: 28,
                          child: FeedbackTabWidget('功能异常')),
                    )),
          ),
        ),
        Container(
          height: 118,
          margin: EdgeInsets.only(left: 2, right: 2, top: 4, bottom: 4),
          child: CupertinoTextField(
            controller: _feedback,
            textAlignVertical: TextAlignVertical.top,
            style: TextStyle(fontSize: 12, color: Color(0xff333333)),
            maxLines: null,
            placeholder: '请输入您的意见（最多100个字）',
            placeholderStyle: TextStyle(
              fontSize: 12,
              color: Color(0xff999999),
            ),
            decoration: BoxDecoration(
                color: Color(0xfff9f9f9),
                borderRadius: BorderRadius.circular(7.5)),
            onChanged: (value) {
              if (value == null || value == '') {
                _submitable = false;
              } else {
                _submitable = true;
              }
              setState(() {});
            },
          ),
        ),
      ],
    );
  }

  Widget _createUpload() {
    List<Widget> images = List();
    _images.forEach((file) {
      images.add(Container(
        margin: EdgeInsets.only(top: 4, bottom: 4, right: 8),
        width: 80,
        height: 80,
        child: FeedbackImageWidget(
          file: file,
          onDelete: () {
            _images.remove(file);
            setState(() {});
          },
        ),
      ));
    });
    if (images.length < 4) {
      images.add(GestureDetector(
        child: Container(
          margin: EdgeInsets.only(top: 4, bottom: 4),
          decoration: BoxDecoration(
              borderRadius: BorderRadius.circular(7.5),
              color: Color(0xfff9f9f9)),
          height: 80,
          width: 80,
          child: Icon(
            Icons.add,
            size: 60,
            color: Color(0xffd8d8d8),
          ),
        ),
        onTap: _onAddImage,
      ));
    }

    return Column(
      children: <Widget>[
        Row(
          children: <Widget>[
            Padding(
              padding: EdgeInsets.only(right: 10, top: 4, bottom: 4),
              child: Text(
                '上传图片',
                style: TextStyle(
                  fontSize: 14,
                  color: Color(0xff333333),
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
            Text(
              '最多上传4张，大小不超过1M/张',
              style: TextStyle(
                fontSize: 12,
                color: Color(0xff999999),
              ),
            ),
          ],
        ),
        Row(
          children: images,
        )
      ],
    );
  }

  Widget _createSubmit() {
    return GestureDetector(
      onTap: () {
        if (!_submitable) {
          return;
        }
        Logger.debug('提交:${_feedback.text.toString()}');
      },
      child: Container(
        margin: EdgeInsets.only(top: 24, bottom: 4),
        height: 45,
        decoration: BoxDecoration(
          color: _submitable ? Colors.redAccent : Color(0xffffe1e1),
          borderRadius: BorderRadius.circular(7.5),
        ),
        child: Center(
          child: Text(
            '提交意见',
            style: TextStyle(
              fontSize: 14,
              color: Colors.white,
            ),
          ),
        ),
      ),
    );
  }

  void _onAddImage() async {
    if (_images.length >= 4) {
      Fluttertoast.showToast(msg: '最多上传4张图片');
      return;
    }

    var status = await Permission.photos.status;
    if (status != PermissionStatus.granted) {
      status = await Permission.photos.request();
    }
    if (status == PermissionStatus.denied) {
      Fluttertoast.showToast(msg: '暂无权限，图片选择失败');
      return null;
    }

    final picker = ImagePicker();
    PickedFile file;
    int index = await showModalBottomSheet(
        context: context,
        builder: (context) {
          return ActionSelectedAlert(
            // title: '拍照/选择图片',
            actions: ['拍照', '从相册选择图片'],
          );
        },
        isScrollControlled: false,
        backgroundColor: Colors.transparent);
    if (index != null) {
      if (index == 0) {
        file = await picker.getImage(source: ImageSource.camera);
      } else {
        file = await picker.getImage(source: ImageSource.gallery);
      }

      if (file == null) return;

      setState(() {
        _images.add(File(file.path));
      });

      // File resultFile = await EncodeUtil.compressImage(file, 800);
    }
  }
}