// Author: fruit.com.cn

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

import '../../core/data/services/favorite_controller.dart';
import '../../core/theme/app_colors.dart';
import '../../l10n/app_localizations.dart';

enum FollowingTab { favorites, history }

/// 编辑底栏的全选与取消动作。
class FollowingEditActions {
  const FollowingEditActions({
    required this.onToggleAll,
    required this.onRemove,
  });

  final void Function(Set<String> ids) onToggleAll;
  final VoidCallback onRemove;
}

const double _barHeight = 48;
const double _barHorizontal = 16;
const double _barFontSize = 13;
const double _barButtonHeight = 30;
const double _removeDialogButtonHeight = 32;

/// 只在追剧编辑中显示底栏。
class FollowingEditSlot extends StatelessWidget {
  const FollowingEditSlot({
    super.key,
    required this.tab,
    required this.editing,
    required this.favorites,
    required this.selected,
    required this.actions,
  });

  final ValueListenable<FollowingTab> tab;
  final ValueListenable<bool> editing;
  final FavoriteController favorites;
  final ValueListenable<Set<String>> selected;
  final FollowingEditActions actions;

  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder<FollowingTab>(
      valueListenable: tab,
      builder: (context, current, _) {
        return ValueListenableBuilder<bool>(
          valueListenable: editing,
          builder: (context, isEditing, _) {
            if (!isEditing || current != FollowingTab.favorites) {
              return const SizedBox.shrink();
            }
            return _bar();
          },
        );
      },
    );
  }

  Widget _bar() {
    return ListenableBuilder(
      listenable: favorites,
      builder: (context, _) {
        return ValueListenableBuilder<Set<String>>(
          valueListenable: selected,
          builder: (context, picked, _) {
            final ids = favorites.cards.map((drama) => drama.id).toSet();
            return FollowingEditBar(
              allSelected: ids.isNotEmpty && ids.every(picked.contains),
              canRemove: picked.isNotEmpty,
              onToggleAll: () => actions.onToggleAll(ids),
              onRemove: actions.onRemove,
            );
          },
        );
      },
    );
  }
}

/// 追剧编辑底栏：全选，以及取消已选追剧。
class FollowingEditBar extends StatelessWidget {
  const FollowingEditBar({
    super.key,
    required this.allSelected,
    required this.canRemove,
    required this.onToggleAll,
    required this.onRemove,
  });

  final bool allSelected;
  final bool canRemove;
  final VoidCallback onToggleAll;
  final VoidCallback onRemove;

  @override
  Widget build(BuildContext context) {
    final l10n = AppLocalizations.of(context)!;
    return Material(
      key: const Key('following-edit-bar'),
      color: AppColors.card,
      child: SafeArea(
        top: false,
        child: SizedBox(
          height: _barHeight,
          child: Padding(
            padding: const EdgeInsets.symmetric(horizontal: _barHorizontal),
            child: Row(
              children: [
                TextButton(
                  key: const Key('following-select-all'),
                  style: TextButton.styleFrom(
                    foregroundColor: AppColors.brandRed,
                    visualDensity: VisualDensity.compact,
                    tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                    minimumSize: const Size(0, _barButtonHeight),
                    padding: const EdgeInsets.symmetric(horizontal: 4),
                    textStyle: const TextStyle(
                      fontSize: _barFontSize,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                  onPressed: onToggleAll,
                  child: Text(
                    allSelected ? l10n.deselectAll : l10n.selectAll,
                    style: const TextStyle(
                      fontSize: _barFontSize,
                      fontWeight: FontWeight.w500,
                    ),
                  ),
                ),
                const Spacer(),
                TextButton(
                  key: const Key('following-cancel-follow'),
                  style: TextButton.styleFrom(
                    foregroundColor: AppColors.brandRed,
                    visualDensity: VisualDensity.compact,
                    tapTargetSize: MaterialTapTargetSize.shrinkWrap,
                    minimumSize: const Size(0, _removeDialogButtonHeight),
                    padding: const EdgeInsets.symmetric(horizontal: 12),
                    textStyle: const TextStyle(
                      fontSize: _barFontSize,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                  onPressed: canRemove ? onRemove : null,
                  child: Text(
                    l10n.cancelFollowing,
                    style: const TextStyle(
                      fontSize: _barFontSize,
                      fontWeight: FontWeight.w600,
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}