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 'package:tasktracker/main.dart';
import 'Data.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 {
  NewActivity({Key? key, this.selectedTask, this.sTime, this.eTime, this.metadata}) : super(key: key);
  late DateTime? sTime;
  late DateTime? eTime;
  late String? metadata;
  late String? selectedTask;
  @override
  _NewActivity createState() => _NewActivity(eTime: eTime, sTime: sTime,selectedCat: selectedTask, metadata: metadata);
}



class _NewActivity extends State<NewActivity> {
    late DateTime init_sTime;
    late DateTime init_eTime;
    late String init_selectedTask;
  _NewActivity({DateTime? eTime, DateTime? sTime, String? metadata, String? selectedCat}){
    editing = sTime != null && eTime!=null && selectedCat!=null;

    this.init_sTime=this.startTime = sTime ?? DateTime.now();
    this.init_eTime=this.endTime = eTime ??DateTime.now().add(Duration(minutes: 30));
    this.metadataController.text = metadata ?? "";
    this.init_selectedTask=this.selectedCat = selectedCat ?? User.taskTypes[0].name;
    print("etime:$eTime, sTime:$sTime, meta:$metadata, task: $selectedCat");

  }

  late DateTime startTime;
  late DateTime endTime;
  TextEditingController metadataController = TextEditingController();
  late String selectedCat;


  bool editing=false;

  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;
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(title: Text((editing) ? 'Edit Activity':'New Activity')),
        body:Column(
                mainAxisSize: MainAxisSize.max,
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Expanded(
                    flex: 9,
                    child: SingleChildScrollView(
                      scrollDirection: Axis.vertical,
                          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: [

                                      ],
                                    )
                                  ]),
                                ],
                              )),
                        ),
                  ),
                  Expanded(
                    flex: 1,
                    child: 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: () {
                                      if(editing){
                                        edit_action();
                                      }else {
                                        add_action();
                                      }
                                    },
                                    child: Text((editing) ? 'Apply':'Add Activity',
                                        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, endTime,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) {
      print("popping : ${navigatorKey.currentWidget?.toStringShort() ?? "n/a"}");
      Navigator.of(navigatorKey.currentContext!).popUntil((route){
        return route.isFirst;
      });
    }else{
      print("Failed adding new activity");
    }
  }

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

      if(!failed) {
        print("popping : ${navigatorKey.currentWidget?.toStringShort() ?? "n/a"}");
        Navigator.of(navigatorKey.currentContext!).popUntil((route){
          return route.isFirst;
        });
      }else{
        print("Failed editing new activity");
      }
    }
}

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;
    },
  );
}