import 'dart:async';

import 'package:flutter/material.dart';
import 'package:routemaster/routemaster.dart';

import '../../Services/date_service.dart';
import '../Misc/InputFields/date_range_picker.dart';

/// Stellt die Inputfelder für die Verlaufsübersicht dar
class InputFields extends StatefulWidget {
  /// Erstellt eine neue Instanz dieser Klasse
  const InputFields({
    super.key,
    this.amountMax,
    this.amountMin,
    this.dateFrom,
    this.dateTo,
    this.name,
  });

  /// Der Name der Transaktion, nach der gesucht werden soll
  final String? name;

  /// Der Mindestbetrag der Transaktion, nach der gesucht werden soll
  final double? amountMin;

  /// Der Maximalbetrag der Transaktion, nach der gesucht werden soll
  final double? amountMax;

  /// Das Datum der Transaktionen, ab dem gestartet wurde
  final DateTime? dateFrom;

  ///Das Datum der Transaktionen, bis zu welchen beendet wurde
  final DateTime? dateTo;

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

class _InputFields extends State<InputFields> {
  final TextEditingController _nameController = TextEditingController();
  final TextEditingController _amountMinController = TextEditingController();
  final TextEditingController _amountMaxController = TextEditingController();
  final TextEditingController _dateTimeController = TextEditingController();

  static const double _filterBreakpoint = 600;

  @override
  void initState() {
    super.initState();

    if (widget.name != null) {
      _nameController.text = widget.name!;
    }

    if (widget.amountMin != null) {
      _amountMinController.text = widget.amountMin!.toString();
    }

    if (widget.amountMax != null) {
      _amountMaxController.text = widget.amountMax!.toString();
    }

    if (widget.dateFrom != null && widget.dateTo != null) {
      final DateTimeRange dateTimeRange = DateTimeRange(
        start: widget.dateFrom!,
        end: widget.dateTo!,
      );

      _dateTimeController.text = DateService.dateTimeRangeToString(
        dateTimeRange,
      )!;
    }
  }

  @override
  void dispose() {
    _nameController.dispose();
    _amountMinController.dispose();
    _amountMaxController.dispose();
    _dateTimeController.dispose();

    super.dispose();
  }

  @override
  Widget build(final BuildContext context) {
    final ThemeData theme = Theme.of(context);

    return LayoutBuilder(
      builder: (final context, final constraints) {
        if (constraints.maxWidth < _filterBreakpoint) {
          return _buildFilterButton(context, theme);
        }

        return _buildInlineFilters(theme);
      },
    );
  }

  Widget _buildInlineFilters(final ThemeData theme) => Row(
    children: <Widget>[
      Expanded(
        child: TextField(
          controller: _nameController,
          decoration: const InputDecoration(
            labelText: 'Name',
            border: OutlineInputBorder(),
          ),
          onChanged: (_) => _updateUrl(),
        ),
      ),
      const SizedBox(width: 8),
      Expanded(
        child: TextField(
          controller: _amountMinController,
          decoration: const InputDecoration(
            labelText: 'Min Betrag €',
            border: OutlineInputBorder(),
          ),
          keyboardType: const TextInputType.numberWithOptions(decimal: true),
          onChanged: (_) => _updateUrl(),
        ),
      ),
      const SizedBox(width: 8),
      Expanded(
        child: TextField(
          controller: _amountMaxController,
          decoration: const InputDecoration(
            labelText: 'Max Betrag €',
            border: OutlineInputBorder(),
          ),
          keyboardType: const TextInputType.numberWithOptions(decimal: true),
          onChanged: (_) => _updateUrl(),
        ),
      ),
      const SizedBox(width: 8),
      Expanded(
        child: DateRangePicker(
          controller: _dateTimeController,
          onChanged: (_) => _updateUrl(),
          decoration: InputDecoration(
            labelText: 'Zeitraum',
            border: const OutlineInputBorder(),
            suffixIcon: Icon(
              Icons.calendar_month,
              color: theme.colorScheme.onSurface,
            ),
          ),
        ),
      ),
      const SizedBox(width: 8),
      IconButton(onPressed: _clear, icon: const Icon(Icons.clear)),
    ],
  );

  Widget _buildFilterButton(
    final BuildContext context,
    final ThemeData theme,
  ) => Align(
    alignment: Alignment.centerLeft,
    child: ElevatedButton.icon(
      icon: const Icon(Icons.filter_alt),
      label: const Text('Filter'),
      onPressed: () => _openFilterDialog(context),
    ),
  );

  void _openFilterDialog(final BuildContext context) {
    unawaited(
      showDialog(
        context: context,
        builder: (final context) => AlertDialog(
          title: const Text('Filter'),
          content: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                TextField(
                  controller: _nameController,
                  decoration: const InputDecoration(
                    labelText: 'Name',
                    border: OutlineInputBorder(),
                  ),
                ),
                const SizedBox(height: 12),
                TextField(
                  controller: _amountMinController,
                  decoration: const InputDecoration(
                    labelText: 'Min Betrag €',
                    border: OutlineInputBorder(),
                  ),
                  keyboardType: const TextInputType.numberWithOptions(
                    decimal: true,
                  ),
                ),
                const SizedBox(height: 12),
                TextField(
                  controller: _amountMaxController,
                  decoration: const InputDecoration(
                    labelText: 'Max Betrag €',
                    border: OutlineInputBorder(),
                  ),
                  keyboardType: const TextInputType.numberWithOptions(
                    decimal: true,
                  ),
                ),
                const SizedBox(height: 12),
                DateRangePicker(
                  controller: _dateTimeController,
                  onChanged: (_) {},
                  decoration: const InputDecoration(
                    labelText: 'Zeitraum',
                    border: OutlineInputBorder(),
                  ),
                ),
              ],
            ),
          ),
          actions: [
            TextButton(
              onPressed: () {
                _clear();
                Navigator.of(context).pop();
              },
              child: const Text('Zurücksetzen'),
            ),
            ElevatedButton(
              onPressed: () {
                _updateUrl();
                Navigator.of(context).pop();
              },
              child: const Text('Anwenden'),
            ),
          ],
        ),
      ),
    );
  }

  void _clear() {
    _nameController.clear();
    _amountMinController.clear();
    _amountMaxController.clear();
    _dateTimeController.clear();
    _updateUrl();
  }

  void _updateUrl() {
    final params = <String, String>{
      if (_nameController.text != '') 'name': _nameController.text,
      if (_amountMinController.text != '')
        'amountMin': _amountMinController.text,
      if (_amountMaxController.text != '')
        'amountMax': _amountMaxController.text,
    };

    if (_dateTimeController.text != '') {
      final DateTimeRange<DateTime>? range = DateService.stringToDateTimeRange(
        _dateTimeController.text,
      );

      if (range != null) {
        params['dateFrom'] = range.start.toIso8601String();
        params['dateTo'] = range.end.toIso8601String();
      }
    }

    Routemaster.of(context).replace('/trend', queryParameters: params);
  }
}