import 'package:date_field/date_field.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:nextcloud_reminder/repeating_task.dart';
import 'package:nextcloud_reminder/types/repeat.dart';
import 'package:nextcloud_reminder/types/tasks.dart';
import 'package:tuple/tuple.dart';

class AddTaskWidget extends StatefulWidget {
  const AddTaskWidget({super.key, this.restorationId, required this.onSave});

  final ValueChanged<RepeatingTask> onSave;
  final String? restorationId;

  @override
  State<StatefulWidget> createState() => _AddTaskWidgetState();
}

//TODO: make _repeat changeable.

class _AddTaskWidgetState extends State<AddTaskWidget> {
  final _formKey = GlobalKey<FormState>();
  final _titleController = TextEditingController();
  static _emptyRepetition() {
    return Tuple2(TextEditingController(text: "1"), ValueNotifier(DateInterval.daily));
  }
  final List<Tuple2<TextEditingController,ValueNotifier<DateInterval>>> _repeatEveryController = [_emptyRepetition()];
  DateTime _beginDate = DateTime.now();

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

  String _prettyInterval(DateInterval d) {
    switch (d) {
      default:
        return d.toString();
    }
  }

  Widget _repeatBuilder(BuildContext context, Tuple2<TextEditingController,ValueNotifier<DateInterval>> data) {
    return Row(
      children: [
        Text("Repeat every " ),
        Expanded(
          flex: 1,
          child: TextFormField(
            controller: data.item1,
            decoration: const InputDecoration(
              hintText: "1",
            ),
            keyboardType: const TextInputType.numberWithOptions(signed: false, decimal: false),
            inputFormatters: [FilteringTextInputFormatter.digitsOnly],
          ),
        ),
        Expanded(
          flex: 3,
          child: DropdownButton<DateInterval>(
            items: DateInterval.values.map((v) => DropdownMenuItem(value: v, child: Text(_prettyInterval(v)))).toList(),
            onChanged: (v) => setState(() {
              data.item2.value = v ?? data.item2.value;
            }),
            value: data.item2.value,
          ),
        ),
        IconButton(onPressed: () => setState(() {
          _repeatEveryController.remove(data);
        }), icon: Icon(Icons.remove, color: Theme.of(context).errorColor,)),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Add new repeating Task')
      ),
      body: Form(
        key: _formKey,
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            TextFormField(
              // The validator receives the text that the user has entered.
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return 'Please enter a name';
                }
                return null;
              },
              controller: _titleController,
              decoration: const InputDecoration(
                labelText: "Taskname"
              ),
            ),

            DateTimeField(
              onDateSelected: (v) => setState(() { _beginDate = v; }),
              selectedDate: _beginDate,
              decoration: const InputDecoration(
                suffixIcon: Icon(Icons.event_note),
                labelText: "Begin"
              ),
              mode: DateTimeFieldPickerMode.date,
            ),
            ] + _repeatEveryController.map((c) => _repeatBuilder(context,c)).toList()
            + [
            ElevatedButton(onPressed: () => setState(() {
              _repeatEveryController.add(_emptyRepetition());
            }), child: const Text("add repetition")),
            Padding(
              padding: const EdgeInsets.symmetric(vertical: 16.0),
              child: ElevatedButton(
                onPressed: () {
                  // Validate returns true if the form is valid, or false otherwise.
                  if (_formKey.currentState!.validate()) {
                    // If the form is valid, display a snackbar. In the real world,
                    // you'd often call a server or save the information in a database.
                    ScaffoldMessenger.of(context).showSnackBar(
                      const SnackBar(content: Text('Task added.')),
                    );
                    var repeats = _repeatEveryController.map((e) => RepeatInterval(interval: e.item2.value, every: int.parse(e.item1.text))).toList();
                    var meta = repeats.map((e) => e.toString()).join("/");
                    widget.onSave(RepeatingTask(
                      task: TaskExtra(
                          title: _titleController.text,
                          begin: _beginDate,
                          meta: {"repeat": meta},
                          repeat: repeats,
                      )
                    ));
                    Navigator.pop(context);
                  }
                },
                child: const Text('Submit'),
              ),
            ),
          ],
        ),
      )
    );
  }
}