import 'package:eatvio_app/features/insights/models/insights_payload_model.dart';
import 'package:eatvio_app/features/insights/presentation/widgets/insights_colors.dart';
import 'package:eatvio_app/generated/l10n.dart';
import 'package:flutter/material.dart';

/// Навигация по дням для вкладки «В течение дня»: `‹ дата ›` и выбор даты.
///
/// Колбэки `null` — навигация неактивна (данные других дней ещё не подключены).
class IntraDateNav extends StatelessWidget {
  const IntraDateNav({
    super.key,
    required this.model,
    this.onPreviousDay,
    this.onNextDay,
    this.onDatePicked,
  });

  final IntraChartModel model;
  final VoidCallback? onPreviousDay;
  final VoidCallback? onNextDay;
  final ValueChanged<DateTime>? onDatePicked;

  @override
  Widget build(BuildContext context) {
    final s = S.of(context);
    final canGoNext = !model.isToday && onNextDay != null;

    return Container(
      padding: const EdgeInsets.all(4),
      decoration: BoxDecoration(
        color: InsightsColors.accentBackground,
        borderRadius: BorderRadius.circular(999),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          _NavButton(
            key: const Key('insights_intra_prev'),
            icon: Icons.chevron_left_rounded,
            tooltip: s.insights_prev_day,
            onPressed: onPreviousDay,
          ),
          InkWell(
            key: const Key('insights_intra_pick'),
            borderRadius: BorderRadius.circular(999),
            onTap: onDatePicked == null ? null : () => _pickDate(context),
            child: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
              child: ConstrainedBox(
                constraints: const BoxConstraints(minWidth: 72),
                child: Row(
                  mainAxisSize: MainAxisSize.min,
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: [
                    const Icon(
                      Icons.calendar_today_rounded,
                      size: 14,
                      color: InsightsColors.blue,
                    ),
                    const SizedBox(width: 6),
                    Text(
                      model.dateLabel,
                      key: const Key('insights_intra_date_label'),
                      style: const TextStyle(
                        fontSize: 13.5,
                        fontWeight: FontWeight.w700,
                        color: InsightsColors.title,
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
          _NavButton(
            key: const Key('insights_intra_next'),
            icon: Icons.chevron_right_rounded,
            tooltip: s.insights_next_day,
            onPressed: canGoNext ? onNextDay : null,
          ),
        ],
      ),
    );
  }

  Future<void> _pickDate(BuildContext context) async {
    final lastDate = DateTime.tryParse(model.maxDate) ?? DateTime.now();
    final current = DateTime.tryParse(model.date) ?? lastDate;
    final picked = await showDatePicker(
      context: context,
      initialDate: current.isAfter(lastDate) ? lastDate : current,
      firstDate: DateTime(2000),
      lastDate: lastDate,
      helpText: S.of(context).insights_pick_date,
    );
    if (picked != null) {
      onDatePicked?.call(picked);
    }
  }
}

class _NavButton extends StatelessWidget {
  const _NavButton({
    super.key,
    required this.icon,
    required this.tooltip,
    required this.onPressed,
  });

  final IconData icon;
  final String tooltip;
  final VoidCallback? onPressed;

  @override
  Widget build(BuildContext context) {
    return Opacity(
      opacity: onPressed == null ? 0.35 : 1,
      child: SizedBox(
        width: 36,
        height: 36,
        child: IconButton(
          padding: EdgeInsets.zero,
          tooltip: tooltip,
          onPressed: onPressed,
          icon: Icon(icon, color: InsightsColors.blue),
        ),
      ),
    );
  }
}