import 'package:flutter/cupertino.dart';
import 'package:please_pay_me/core/format/formatters.dart';
import 'package:please_pay_me/data/models/job.dart';
import 'package:please_pay_me/features/work/jobs_controller.dart';
import 'package:please_pay_me/theme/theme.dart';
import 'package:please_pay_me/ui/ui.dart';

/// Create / edit form for a job and its payday schedule.
class JobFormSheet extends StatefulWidget {
  const JobFormSheet({super.key, required this.onSubmit, this.initial});

  final Job? initial;

  final Future<String?> Function({
    required String name,
    required double salaryAmount,
    required List<int> payDays,
    required double firstPayPercent,
    required WeekendPolicy weekendPolicy,
  }) onSubmit;

  @override
  State<JobFormSheet> createState() => _JobFormSheetState();
}

class _JobFormSheetState extends State<JobFormSheet> {
  late final _nameController = TextEditingController(text: widget.initial?.name ?? '');
  late final _salaryController = TextEditingController(
    text: widget.initial == null ? '' : widget.initial!.salaryAmount.toStringAsFixed(0),
  );

  late int _firstDay = widget.initial?.payDays.firstOrNull ?? 5;
  late int? _secondDay =
      (widget.initial?.payDays.length ?? 0) > 1 ? widget.initial!.payDays[1] : 20;
  late double _firstPercent = widget.initial?.firstPayPercent ?? 40;
  late WeekendPolicy _policy = widget.initial?.weekendPolicy ?? WeekendPolicy.beforeWeekend;

  bool _saving = false;
  String? _error;

  bool get _isEditing => widget.initial != null;

  @override
  void dispose() {
    _nameController.dispose();
    _salaryController.dispose();
    super.dispose();
  }

  Future<void> _submit() async {
    final name = _nameController.text.trim();
    final salary = double.tryParse(
      _salaryController.text.trim().replaceAll(',', '.').replaceAll(' ', ''),
    );

    if (name.isEmpty) {
      setState(() => _error = 'Введите название работы');
      return;
    }
    if (salary == null || salary <= 0) {
      setState(() => _error = 'Введите оклад больше нуля');
      return;
    }

    setState(() {
      _saving = true;
      _error = null;
    });

    final error = await widget.onSubmit(
      name: name,
      salaryAmount: salary,
      payDays: [_firstDay, if (_secondDay != null) _secondDay!],
      firstPayPercent: _secondDay == null ? 100 : _firstPercent,
      weekendPolicy: _policy,
    );

    if (!mounted) return;

    if (error != null) {
      setState(() {
        _saving = false;
        _error = error;
      });
      return;
    }

    Navigator.of(context).pop(true);
  }

  @override
  Widget build(BuildContext context) {
    final salary = double.tryParse(
          _salaryController.text.trim().replaceAll(',', '.').replaceAll(' ', ''),
        ) ??
        0;

    return CupertinoPageScaffold(
      backgroundColor: AppColors.of(context, AppColors.groupedBackground),
      navigationBar: AppNavBar(
        title: _isEditing ? 'Работа' : 'Новая работа',
        leading: CupertinoButton(
          padding: EdgeInsets.zero,
          minimumSize: Size.zero,
          onPressed: _saving ? null : () => Navigator.of(context).pop(false),
          child: const AppText.body('Отмена', color: AppColors.accent),
        ),
      ),
      child: SafeArea(
        child: ListView(
          padding: const EdgeInsets.only(top: AppSpacing.s4, bottom: AppSpacing.s6),
          children: [
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: AppSpacing.gutter),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  AppTextField(
                    label: 'Название',
                    placeholder: 'Основная работа',
                    controller: _nameController,
                    enabled: !_saving,
                  ),
                  const SizedBox(height: AppSpacing.s4),
                  AppTextField(
                    label: 'Оклад в месяц',
                    placeholder: '0',
                    controller: _salaryController,
                    enabled: !_saving,
                    keyboardType: const TextInputType.numberWithOptions(decimal: true),
                    onChanged: (_) => setState(() {}),
                  ),
                ],
              ),
            ),
            const SizedBox(height: AppSpacing.s5),
            AppListSection(
              header: 'Дни выплат',
              footer: 'Если день выпадает на выходные, выплата сдвигается по правилу ниже.',
              children: [
                AppListTile(
                  title: 'Первая выплата',
                  value: '$_firstDay числа',
                  onTap: _saving ? null : () => _pickDay(isFirst: true),
                ),
                AppSwitchRow(
                  title: 'Вторая выплата',
                  value: _secondDay != null,
                  onChanged: _saving
                      ? null
                      : (value) => setState(() => _secondDay = value ? 20 : null),
                ),
                if (_secondDay != null)
                  AppListTile(
                    title: 'Вторая выплата',
                    value: '$_secondDay числа',
                    onTap: _saving ? null : () => _pickDay(isFirst: false),
                  ),
              ],
            ),
            if (_secondDay != null) ...[
              const SizedBox(height: AppSpacing.s5),
              AppCard(
                title: 'Доля первой выплаты',
                subtitle: '${_firstPercent.round()}% — '
                    '${formatMoney(salary * _firstPercent / 100)} из ${formatMoney(salary)}',
                child: CupertinoSlider(
                  value: _firstPercent,
                  min: 5,
                  max: 95,
                  divisions: 18,
                  activeColor: AppColors.of(context, AppColors.accent),
                  onChanged: _saving ? null : (v) => setState(() => _firstPercent = v),
                ),
              ),
            ],
            const SizedBox(height: AppSpacing.s5),
            const AppSectionHeader('Если выплата на выходных'),
            AppSegmentedControl(
              labels: WeekendPolicy.values.map((policy) => policy.label).toList(),
              index: WeekendPolicy.values.indexOf(_policy),
              onChanged: (index) => setState(() => _policy = WeekendPolicy.values[index]),
            ),
            if (_error != null)
              Padding(
                padding: const EdgeInsets.fromLTRB(
                  AppSpacing.gutter,
                  AppSpacing.s3,
                  AppSpacing.gutter,
                  0,
                ),
                child: AppText.footnote(_error!, color: AppColors.systemRed),
              ),
            const SizedBox(height: AppSpacing.s5),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: AppSpacing.gutter),
              child: AppButton(
                label: _isEditing ? 'Сохранить' : 'Добавить работу',
                loading: _saving,
                onPressed: _submit,
              ),
            ),
          ],
        ),
      ),
    );
  }

  Future<void> _pickDay({required bool isFirst}) async {
    final initial = isFirst ? _firstDay : (_secondDay ?? 20);
    var picked = initial;

    final result = await showCupertinoModalPopup<int>(
      context: context,
      builder: (ctx) => Container(
        height: 280,
        color: AppColors.of(ctx, AppColors.groupedSurface),
        child: SafeArea(
          top: false,
          child: Column(
            children: [
              Expanded(
                child: CupertinoPicker(
                  itemExtent: 36,
                  scrollController: FixedExtentScrollController(initialItem: initial - 1),
                  onSelectedItemChanged: (index) => picked = index + 1,
                  children: [
                    for (var day = 1; day <= 31; day++) Center(child: AppText.body('$day числа')),
                  ],
                ),
              ),
              Padding(
                padding: const EdgeInsets.fromLTRB(
                  AppSpacing.gutter,
                  AppSpacing.s2,
                  AppSpacing.gutter,
                  AppSpacing.s3,
                ),
                child: AppButton(
                  label: 'Готово',
                  onPressed: () => Navigator.of(ctx).pop(picked),
                ),
              ),
            ],
          ),
        ),
      ),
    );

    if (result == null || !mounted) return;
    setState(() {
      if (isFirst) {
        _firstDay = result;
      } else {
        _secondDay = result;
      }
    });
  }
}

Future<void> showJobFormSheet({
  required BuildContext context,
  required JobsController controller,
  Job? initial,
}) async {
  final saved = await showAppFormSheet<bool>(
    context: context,
    builder: (_) => JobFormSheet(
      initial: initial,
      onSubmit: ({
        required name,
        required salaryAmount,
        required payDays,
        required firstPayPercent,
        required weekendPolicy,
      }) {
        if (initial == null) {
          return controller.create(
            name: name,
            salaryAmount: salaryAmount,
            payDays: payDays,
            firstPayPercent: firstPayPercent,
            weekendPolicy: weekendPolicy,
          );
        }
        return controller.update(
          jobId: initial.id,
          name: name,
          salaryAmount: salaryAmount,
          payDays: payDays,
          firstPayPercent: firstPayPercent,
          weekendPolicy: weekendPolicy,
        );
      },
    ),
  );

  if (saved == true && context.mounted) {
    await showAppToast(
      context,
      message: initial == null ? 'Работа добавлена' : 'Работа обновлена',
    );
  }
}