import 'package:flutter/material.dart';
import 'package:rezervisanje/globals.dart' as globals;
import 'dart:async';
import 'package:cloud_firestore/cloud_firestore.dart';

class ReserveTable extends StatefulWidget {
  @override
  _ReserveTableState createState() => _ReserveTableState();
}

class _ReserveTableState extends State<ReserveTable> {
  var sum;
  var step = 0;
  var hours = 0;
  var minutes = 0;
  DateTime times;
  final List<LoadList> terminlist = new List();
  final List<LoadList> items = new List();
  final formKey = GlobalKey<FormState>();
  Future<int> firebaseQuery;
  @override
  void initState() {
    super.initState();
    firebaseQuery = Firestore.instance
        .collection('salons')
        .document(globals.salonkey)
        .get()
        .then((document) {
      setState(() {
        globals.shiftstart = document.data['firstshiftstart'];
        globals.shiftend = document.data['firstshiftend'];
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    if (globals.day == null) {
      globals.day = DateTime(
          DateTime.now().year, DateTime.now().month, DateTime.now().day);
    }
    times = globals.day.add(new Duration(days: -1));
    print("Day ;  " + globals.day.toString());
    print('times : ' + times.toString());
    return StreamBuilder(
      stream: Firestore.instance
          .collection('termins')
          .where('time', isLessThanOrEqualTo: globals.day)
          .where('time', isGreaterThanOrEqualTo: times)
          .where('employeeID', isEqualTo: globals.employeeID)
          .snapshots(),
      builder: (BuildContext context, snapshot) {
        if (snapshot.hasError) {
          return new Center(child: Text(snapshot.error));
        } else {
          if (snapshot.hasData) {
            step = 0;
            sum = snapshot.data.documents.length;
            for (int i = 0; i < sum; i++) {
              DateTime date = snapshot.data.documents[i]['time'].toDate();

              terminlist.add(new LoadList(date.hour, date.minute, true));
            }
            return new FutureBuilder(
              future: firebaseQuery,
              builder: (BuildContext context, AsyncSnapshot document) {
                switch (document.connectionState) {
                  case ConnectionState.none:
                  case ConnectionState.waiting:
                    return new Center(child: new CircularProgressIndicator());
                  default:
                    if (document.hasError)
                      return new Center(child: Text(document.error));
                    else {
                      items.clear();
                      print("HOSSZ: " + terminlist.length.toString());
                      minutes = 0;
                      hours = 0;
                      int div = ((globals.shiftend - globals.shiftstart) *
                              60 /
                              globals.requiredtime)
                          .round();
                      hours = globals.shiftstart;
                      for (var i = 0; i < div; i++) {
                        if (minutes == 60) {
                          minutes = 0;
                          hours = hours + 1;
                        }
                        if (sum != 0 && sum != null) {
                          if (terminlist[step].hours == hours &&
                              terminlist[step].minutes == minutes &&
                              step < sum) {
                            items.add(new LoadList(terminlist[step].hours,
                                terminlist[step].minutes, true));
                            step = step + 1;
                          } else
                            items.add(new LoadList(hours, minutes, false));
                        } else {
                          items.add(new LoadList(hours, minutes, false));
                        }
                        minutes += globals.requiredtime;
                      }
                      print(items.length);
                      return new Scaffold(
                          appBar: new AppBar(
                            title: new Text(globals.employee == ""
                                ? "Rezervisanje"
                                : globals.employee),
                            backgroundColor: Colors.deepOrange,
                          ),
                          drawer: new Drawer(
                              child: new ListView(children: <Widget>[
                            new ListTile(
                                title: new Text("Zatvori"),
                                trailing: new Icon(Icons.arrow_upward),
                                onTap: () {
                                  Navigator.of(context).pop();
                                })
                          ])),
                          body: Card(
                              child: Padding(
                            padding: EdgeInsets.all(8.0),
                            child: Form(
                                key: formKey,
                                child: new ListView.builder(
                                    scrollDirection: Axis.vertical,
                                    itemCount: items.length,
                                    itemBuilder: (context, index) {
                                      new Divider(
                                        height: 15.0,
                                        color: Colors.black,
                                      );
                                      return new Card(
                                        color: items[index].res
                                            ? Colors.deepOrange
                                            : Colors.greenAccent,
                                        child: new Column(
                                          children: <Widget>[
                                            new Column(
                                              children: <Widget>[
                                                new Container(
                                                    child:
                                                        items[index].minutes ==
                                                                0
                                                            ? new Text(
                                                                items[index]
                                                                        .hours
                                                                        .toString() +
                                                                    ':' +
                                                                    items[index]
                                                                        .minutes
                                                                        .toString() +
                                                                    '0',
                                                                style:
                                                                    new TextStyle(
                                                                        fontSize:
                                                                            22),
                                                              )
                                                            : new Text(
                                                                items[index]
                                                                        .hours
                                                                        .toString() +
                                                                    ':' +
                                                                    items[index]
                                                                        .minutes
                                                                        .toString(),
                                                                style:
                                                                    new TextStyle(
                                                                        fontSize:
                                                                            22),
                                                              )),
                                                new Container(
                                                  height: 15.0,
                                                ),
                                                new Text(items[index].res
                                                    ? "Rezervisano"
                                                    : "Slobodno"),
                                                new Divider(
                                                  height: 15.0,
                                                  color: Colors.black,
                                                ),
                                              ],
                                            )
                                          ],
                                        ),
                                      );
                                    })),
                          )));
                    }
                }
              },
            );
          } else {
            return new Text("Pokusaj ponovo!");
          }
        }
      },
    );
  }
}

class LoadList {
  final hours;
  final minutes;
  final res;
  LoadList(this.hours, this.minutes, this.res);
}
//when nothing is in snapshot,in listbuilder are only green field,and then when I add some data in firebase it gives me range error,rebuilding solves it
//when at building the snapshot is not empty its working fine