import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
import 'package:intl/intl.dart';
import 'User.dart' as User;
DateFormat dateFormat = DateFormat("yyyy-MM-dd HH:mm:ss");
DateFormat durationFormat = DateFormat("HH:mm:ss");

class NewActivity extends StatefulWidget {
  const NewActivity({Key? key}) : super(key: key);

  @override
  _NewActivity createState() => _NewActivity();
}

String selectedCat = User.taskTypes[0].name;

List<String> getActivities(){
  List<String> _cats = [];
  print(User.taskTypes[0].name + " : " + selectedCat);
  User.taskTypes.forEach((element) {
    String name = element.name;
    if(_cats.contains(element.name)){

    }else{
    _cats.add(name);}
  });
  return _cats;
}

class _NewActivity extends State<NewActivity> {

  DateTime startTime = DateTime.now();
  DateTime endTime = DateTime.now().add(Duration(minutes: 30));
  TextEditingController metadataController = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text('New Activity')),
        body: Container(
            height: MediaQuery.of(context).size.height,
            child: Column(
                mainAxisSize: MainAxisSize.max,
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  SingleChildScrollView(
                      child: Padding(
                          padding: EdgeInsets.fromLTRB(20, 50, 20, 50),
                          child: Column(
                            children: [
                              Column(children: [
                                Container(
                                    padding: EdgeInsets.all(10),
                                    child: Text('Task')),
                                
                                Container(
                                    padding: EdgeInsets.symmetric(
                                        horizontal: 12, vertical: 1),
                                    decoration: BoxDecoration(
                                        color: Colors.blueGrey,
                                        borderRadius: BorderRadius.circular(12),
                                        border: Border.all(
                                            color: Colors.grey, width: 2)),
                                    child: DropdownButton<String>(
                                        dropdownColor: Colors.blueGrey,
                                        iconSize: 30,
                                        elevation: 10,
                                        borderRadius: BorderRadius.circular(10),
                                        value: selectedCat,
                                        isExpanded: true,
                                        items: getActivities().map<DropdownMenuItem<String>>(
                                                (String value) {
                                                  print(value);
                                              return DropdownMenuItem<String>(
                                                value: value,
                                                child: Text(value),
                                              );
                                            }).toList(),
                                        onChanged: (String? _value) {
                                          setState(() {
                                            selectedCat = _value ?? 'n/a';
                                          });
                                        })),

                                Container(
                                  padding: EdgeInsets.all(10),
                                  child:Column(
                                    children: [

                                      TextField(
                                        controller: metadataController,
                                        decoration: InputDecoration(
                                          hintText: 'Description (optional)',
                                            filled: true,
                                            border: OutlineInputBorder(
                                              borderRadius: BorderRadius.circular(20)
                                            )
                                        ),
                                      ),
                                    ],
                                  )
                                ),
                                Container(
                                    child: Divider(
                                  height: 30,
                                )),
                                Container(
                                    padding: EdgeInsets.all(10),
                                    child: Text('Start Time')),
                                Row(
                                  mainAxisSize: MainAxisSize.max,
                                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                                  children: [
                                    QuickTimeButton('Last', Function: (){
                                      if(User.activities.length > 0) {
                                        startTime= User.activities[0].endTime;
                                      }
                                    })
                                    ,
                                    Container(
                                        padding: EdgeInsets.symmetric(
                                            horizontal: 12, vertical: 1),
                                        decoration: BoxDecoration(
                                            borderRadius: BorderRadius.circular(12),
                                            border: Border.all(
                                                color: Colors.grey, width: 2)),
                                        child: MaterialButton(
                                            onPressed: () {
                                              setState(() {
                                                DatePicker.showDateTimePicker(
                                                    context,
                                                    showTitleActions: true,
                                                    onChanged: (date) {
                                                  // print('change $date');
                                                }, onConfirm: (date) {
                                                  setState(() {
                                                    if(endTime.compareTo(date) < 0){
                                                      const snackBar = SnackBar(
                                                        content: Text('You cannot start something after you ended it!'),
                                                      );
                                                      ScaffoldMessenger.of(context).showSnackBar(snackBar);
                                                    }else {
                                                      startTime = date;
                                                    }
                                                  });
                                                },
                                                    currentTime: startTime,
                                                    locale: LocaleType.en);
                                              });
                                            },
                                            child: Text(
                                                dateFormat.format(startTime),
                                                style: TextStyle(
                                                    color: Colors.blue)))),
                                    QuickTimeButton('Now', Function: (){
                                      startTime = DateTime.now();
                                    })
                                  ],
                                ),
                                SizedBox(
                                  height: 10,
                                ),
                                Container(
                                    padding: EdgeInsets.all(10),
                                    child: Text('Ended Time')),
                                Row(
                                  mainAxisSize: MainAxisSize.max,
                                  mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                                  children: [
                                    Container(width: 60,),
                                    Container(
                                        padding: EdgeInsets.symmetric(
                                            horizontal: 12, vertical: 1),
                                        decoration: BoxDecoration(
                                            borderRadius: BorderRadius.circular(12),
                                            border: Border.all(
                                                color: Colors.grey, width: 2)),
                                        child: MaterialButton(

                                            onPressed: () {
                                              setState(() {
                                                DatePicker.showDateTimePicker(
                                                    context,
                                                    showTitleActions: true,
                                                    onChanged: (date) {
                                                  // print('change $date');
                                                }, onConfirm: (date) {
                                                  setState(() {
                                                    if(startTime.compareTo(date) > 0){
                                                      const snackBar = SnackBar(
                                                        content: Text('You cannot end something before you start it!'),
                                                      );
                                                      ScaffoldMessenger.of(context).showSnackBar(snackBar);
                                                    }else {
                                                      endTime = date;
                                                    }
                                                  });
                                                },
                                                    currentTime: endTime,
                                                    locale: LocaleType.en);
                                              });
                                            },
                                            child: Text(dateFormat.format(endTime),
                                                style: TextStyle(
                                                    color: Colors.blue)))),
                                    QuickTimeButton('Now', Function: (){
                                      endTime = DateTime.now();
                                    })
                                  ],
                                ),
                                SizedBox(
                                  height: 30,
                                ),
                                Text('Duration : ' +
                                    _printDuration(
                                        endTime.difference(startTime)),
                                    style:TextStyle(
                                      fontSize: 20,
                                )),
                                Divider(
                                  height: 30,
                                ),
                                Column(
                                  crossAxisAlignment: CrossAxisAlignment.start,
                                  children: [
                                    
                                  ],
                                )
                              ]),
                            ],
                          ))),
                  Container(
                      padding:
                          EdgeInsets.symmetric(vertical: 10, horizontal: 20),
                      child: Row(
                        mainAxisSize: MainAxisSize.max,
                        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                        children: [
                          Expanded(
                              flex: 5,
                              child: Container(
                                padding: EdgeInsets.symmetric(horizontal: 10, vertical: 0),
                                  child: ElevatedButton(

                                    style:ElevatedButton.styleFrom(
                                        primary: Colors.red,
                                        shape: StadiumBorder()
                                    ),
                                      onPressed: () {
                                        Navigator.pop(context);
                                      },
                                      child: Text('Back',
                                          style: TextStyle(fontSize: 20))))),
                          Expanded(
                              flex: 6,
                            child: Container(
                                padding: EdgeInsets.symmetric(horizontal: 10, vertical: 0),
                                child: ElevatedButton(
                                  style:ElevatedButton.styleFrom(
                                      primary: Colors.green,
                                      shape: StadiumBorder()
                                  ),
                                  onPressed: () {

                                    add_action();
                                  },
                                  child: Text('Add Entry',
                                      style: TextStyle(fontSize: 20))))),
                        ],
                      ))
                ])));
  }

  Widget QuickTimeButton(text, {Function}){
    return InkWell(
      child: Container(
          padding:EdgeInsets.symmetric(horizontal: 15),
        height: 30,
        decoration:BoxDecoration(
          color: Colors.blueAccent,
          borderRadius: BorderRadius.circular(50)
        ),
          child:Align(child: Text(text),alignment: Alignment.center,)
      ),

      onTap: (){
        Function();
        setState(() {

        });
      },);
  }

  void add_action() async{

    print('adding Task Type : $selectedCat at $startTime - $endTime');
    bool failed=false;
    await User.UserOperations.addActivity(selectedCat,startTime.toString(), endTime.toString(),metadata:metadataController.text, onOverlap: (overlapCount){
      showAlertDialog(context, 'Error adding activity', 'Cannot add activity between ${dateFormat.format(startTime)} - ${dateFormat.format(endTime)}, $overlapCount activities are already added within this time range');
      failed=true;
    });

    if(!failed)
      Navigator.of(context).pop();
  }
}

String _printDuration(Duration duration) {
  String twoDigits(int n) => n.toString().padLeft(2, "0");
  String twoDigitMinutes = twoDigits(duration.inMinutes.remainder(60));
  String twoDigitSeconds = twoDigits(duration.inSeconds.remainder(60));
  return "${twoDigits(duration.inHours)}:$twoDigitMinutes:$twoDigitSeconds";
}

showAlertDialog(BuildContext context, String title, String message) {

  // set up the button
  Widget okButton = TextButton(
    child: Text("OK"),
    onPressed: () { Navigator.of(context).pop(); },
  );

  // set up the AlertDialog
  AlertDialog alert = AlertDialog(
    title: Text(title),
    content: Text(message),
    actions: [
      okButton,
    ],
  );

  // show the dialog
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return alert;
    },
  );
}