import 'package:flutter/material.dart';
import 'package:invoiceninja_flutter/utils/formatting.dart';
import 'package:invoiceninja_flutter/utils/strings.dart';

class DatePicker extends StatefulWidget {
  const DatePicker({
    @required this.labelText,
    @required this.onSelected,
    @required this.selectedDate,
    this.validator,
    this.autoValidate = false,
    this.allowClearing = false,
    this.firstDate,
  });

  final String labelText;
  final String selectedDate;
  final Function(String) onSelected;
  final Function validator;
  final bool autoValidate;
  final bool allowClearing;
  final DateTime firstDate;

  @override
  _DatePickerState createState() => new _DatePickerState();
}

class _DatePickerState extends State<DatePicker> {
  final _textController = TextEditingController();
  final _focusNode = FocusNode();

  @override
  void initState() {
    super.initState();
    _focusNode.addListener(_onFoucsChanged);
  }

  @override
  void didChangeDependencies() {
    _textController.text = formatDate(widget.selectedDate, context);

    super.didChangeDependencies();
  }

  void _onFoucsChanged() {
    if (!_focusNode.hasFocus) {
      _textController.text = formatDate(widget.selectedDate, context);
    }
  }

  @override
  void dispose() {
    _textController.dispose();
    _focusNode.removeListener(_onFoucsChanged);
    _focusNode.dispose();

    super.dispose();
  }

  void _showDatePicker() async {
    DateTime firstDate = DateTime.now();
    final DateTime initialDate =
        widget.selectedDate != null && widget.selectedDate.isNotEmpty
            ? DateTime.tryParse(widget.selectedDate)
            : DateTime.now();

    if (widget.firstDate != null) {
      if (initialDate.isBefore(firstDate)) {
        firstDate = initialDate;
      }
    } else {
      firstDate = DateTime(2015, 8);
    }

    final DateTime selectedDate = await showDatePicker(
      context: context,
      initialDate: initialDate,
      firstDate: firstDate,
      lastDate: DateTime(2101),
      //initialEntryMode: DatePickerEntryMode.input,
    );

    if (selectedDate != null) {
      final date = convertDateTimeToSqlDate(selectedDate);
      _textController.text = formatDate(date, context);
      widget.onSelected(date);
    }
  }

  @override
  Widget build(BuildContext context) {
    return TextFormField(
      focusNode: _focusNode,
      validator: widget.validator,
      autovalidateMode: widget.autoValidate
          ? AutovalidateMode.always
          : AutovalidateMode.onUserInteraction,
      controller: _textController,
      decoration: InputDecoration(
          labelText: widget.labelText,
          suffixIcon:
              widget.allowClearing && (widget.selectedDate ?? '').isNotEmpty
                  ? IconButton(
                      icon: Icon(Icons.clear),
                      onPressed: () {
                        _textController.text = '';
                        widget.onSelected('');
                      },
                    )
                  : IconButton(
                      icon: Icon(Icons.date_range),
                      onPressed: () => _showDatePicker(),
                    )),
      onChanged: (value) {
        if (value.isEmpty) {
          widget.onSelected('');
        } else {
          String date = '';
          if (isAllDigits(value)) {
            if (value.length < 4) {
              value = '0$value';
            }
            if (value.length < 5) {
              value = '${DateTime.now().year}$value';
            }
            date = convertDateTimeToSqlDate(DateTime.tryParse(value));
          } else {
            date = parseDate(value, context);
          }

          if ((date ?? '').isNotEmpty) {
            widget.onSelected(date);
          }
        }
      },
    );
  }
}