/// Renders the Task Selection Modal widget for the FocusFlow Flutter UI.
library;

import 'package:flutter/material.dart';

import '../models/today_screen_models.dart';
import '../theme/focus_flow_tokens.dart';
import 'timeline/difficulty_bars.dart';
import 'timeline/reward_icon.dart';

/// Modal shown when a selectable timeline task card is opened.
class TaskSelectionModal extends StatelessWidget {
  /// Creates a task selection modal for [card].
  const TaskSelectionModal({
    required this.card,
    required this.onClose,
    this.onStatusPressed,
    super.key,
  });

  /// Card model whose details and actions should be displayed.
  final TimelineCardModel card;

  /// Callback invoked when the modal should close.
  final VoidCallback onClose;

  /// Callback invoked when the status circle should toggle completion.
  final VoidCallback? onStatusPressed;

  @override
  Widget build(BuildContext context) {
    final accent = _accentFor(card.visualKind);
    return Material(
      color: Colors.transparent,
      child: Container(
        key: const ValueKey('task-selection-modal'),
        width: 548,
        padding: const EdgeInsets.fromLTRB(24, 22, 24, 20),
        decoration: BoxDecoration(
          color: FocusFlowTokens.elevatedPanel.withValues(alpha: 0.98),
          borderRadius: BorderRadius.circular(FocusFlowTokens.modalRadius),
          border: Border.all(color: accent.withValues(alpha: 0.86)),
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                _ModalStatusButton(
                  card: card,
                  color: accent,
                  onPressed: onStatusPressed,
                ),
                const SizedBox(width: 28),
                Expanded(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        card.title,
                        style: const TextStyle(
                          color: FocusFlowTokens.textPrimary,
                          fontSize: FocusFlowTokens.modalTitleSize,
                          fontWeight: FontWeight.w800,
                        ),
                      ),
                      const SizedBox(height: 6),
                      _HeaderMetadata(card: card),
                    ],
                  ),
                ),
                IconButton(
                  key: const ValueKey('close-task-modal'),
                  onPressed: onClose,
                  style: IconButton.styleFrom(
                    backgroundColor: FocusFlowTokens.glassPanelStrong,
                    foregroundColor: FocusFlowTokens.textPrimary,
                  ),
                  icon: const Icon(Icons.close),
                ),
              ],
            ),
            const SizedBox(height: 26),
            Row(
              children: [
                Expanded(
                  child: _InfoTile(
                    label: card.rewardLabel,
                    child: RewardIcon(color: FocusFlowTokens.accentMagenta),
                  ),
                ),
                const SizedBox(width: 28),
                Expanded(
                  child: _InfoTile(
                    label: card.effortLabel,
                    child: DifficultyBars(
                      difficulty: card.difficultyIconToken,
                      color: FocusFlowTokens.restPurple,
                    ),
                  ),
                ),
              ],
            ),
            const SizedBox(height: 30),
            GridView.count(
              crossAxisCount: 2,
              crossAxisSpacing: 26,
              mainAxisSpacing: 16,
              childAspectRatio: 4.1,
              shrinkWrap: true,
              physics: const NeverScrollableScrollPhysics(),
              children: const [
                _ActionButton(icon: Icons.check, label: 'Done'),
                _ActionButton(icon: Icons.arrow_forward, label: 'Push'),
                _ActionButton(
                  icon: Icons.inventory_2_outlined,
                  label: 'Move to Backlog',
                ),
                _ActionButton(icon: Icons.apps, label: 'Break up'),
              ],
            ),
            const SizedBox(height: 14),
            const Text(
              'Options apply after confirmation.',
              style: TextStyle(color: FocusFlowTokens.textMuted, fontSize: 14),
            ),
          ],
        ),
      ),
    );
  }
}

class _ModalStatusButton extends StatelessWidget {
  const _ModalStatusButton({
    required this.card,
    required this.color,
    required this.onPressed,
  });

  final TimelineCardModel card;
  final Color color;
  final VoidCallback? onPressed;

  @override
  Widget build(BuildContext context) {
    final ring = Container(
      key: const ValueKey('task-modal-status'),
      width: 44,
      height: 44,
      decoration: BoxDecoration(
        shape: BoxShape.circle,
        color: card.isCompleted ? color : Colors.transparent,
        border: Border.all(color: color, width: 4),
      ),
      child: card.isCompleted
          ? const Icon(
              Icons.check,
              color: FocusFlowTokens.appBackground,
              size: 26,
            )
          : null,
    );
    if (onPressed == null) {
      return ring;
    }
    return Tooltip(
      message: card.isCompleted ? 'Mark not done' : 'Mark complete',
      child: Semantics(
        button: true,
        label: card.isCompleted
            ? 'Mark ${card.title} not done'
            : 'Mark ${card.title} complete',
        child: MouseRegion(
          cursor: SystemMouseCursors.click,
          child: GestureDetector(
            behavior: HitTestBehavior.opaque,
            onTap: onPressed,
            child: ring,
          ),
        ),
      ),
    );
  }
}

class _HeaderMetadata extends StatelessWidget {
  const _HeaderMetadata({required this.card});

  final TimelineCardModel card;

  @override
  Widget build(BuildContext context) {
    const metadataStyle = TextStyle(
      color: FocusFlowTokens.textMuted,
      fontSize: 17,
    );
    if (!card.isCompleted) {
      return Text('${card.typeLabel} - ${card.timeText}', style: metadataStyle);
    }
    final completedTime = card.completedTimeText;
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          completedTime == null || completedTime.isEmpty
              ? 'Completed'
              : 'Completed - $completedTime',
          style: metadataStyle,
        ),
        const SizedBox(height: 3),
        Text(
          'Planned: ${card.timeText}',
          style: metadataStyle.copyWith(fontSize: 15),
        ),
      ],
    );
  }
}

class _InfoTile extends StatelessWidget {
  const _InfoTile({required this.child, required this.label});

  final Widget child;
  final String label;

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 58,
      padding: const EdgeInsets.symmetric(horizontal: 16),
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(FocusFlowTokens.smallButtonRadius),
        border: Border.all(color: FocusFlowTokens.subtleBorder),
      ),
      child: Row(
        children: [
          child,
          const SizedBox(width: 18),
          Flexible(
            child: Text(
              label,
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
              style: const TextStyle(
                color: FocusFlowTokens.textPrimary,
                fontSize: 17,
                fontWeight: FontWeight.w700,
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _ActionButton extends StatelessWidget {
  const _ActionButton({required this.icon, required this.label});

  final IconData icon;
  final String label;

  @override
  Widget build(BuildContext context) {
    return OutlinedButton.icon(
      onPressed: () {},
      style: OutlinedButton.styleFrom(
        foregroundColor: FocusFlowTokens.textPrimary,
        side: const BorderSide(color: FocusFlowTokens.subtleBorder),
        shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.circular(
            FocusFlowTokens.smallButtonRadius,
          ),
        ),
      ),
      icon: Icon(icon),
      label: Text(
        label,
        style: const TextStyle(
          fontSize: FocusFlowTokens.modalButtonSize,
          fontWeight: FontWeight.w700,
        ),
      ),
    );
  }
}

Color _accentFor(TaskVisualKind kind) {
  return switch (kind) {
    TaskVisualKind.flexible => FocusFlowTokens.flexibleGreen,
    TaskVisualKind.required => FocusFlowTokens.requiredPink,
    TaskVisualKind.appointment => FocusFlowTokens.appointmentBlue,
    TaskVisualKind.freeSlot => FocusFlowTokens.restPurple,
    TaskVisualKind.completedSurprise => FocusFlowTokens.completedGray,
  };
}