// Author: fruit.com.cn

import 'package:flutter/material.dart';

import '../../../core/formatting/count_format.dart';
import '../../../core/theme/app_colors.dart';

const double _defaultButtonSize = 44;
const double _defaultIconSize = 32;
const double _defaultCountFont = 12;
const double _defaultIconCountGap = 2;
const double _defaultItemGap = 24;

/// 互动栏单项：图标、计数与点击。
class InteractionRailItem {
  const InteractionRailItem({
    required this.key,
    required this.label,
    required this.onTap,
    this.asset,
    this.icon,
    this.count,
    this.countKey,
    this.selected = false,
    this.selectedColor = AppColors.blue,
    this.mirrorIcon = false,
  }) : assert((asset == null) != (icon == null));

  final Key key;
  final String? asset;
  final IconData? icon;
  final String label;
  final VoidCallback onTap;
  final int? count;
  final Key? countKey;
  final bool selected;
  final Color selectedColor;

  /// 水平镜像图标（分享弯箭头用 reply 镜像得到）。
  final bool mirrorIcon;
}

/// 播放页与首页 feed 共用的右侧互动栏：收藏/评论/喜欢/分享。
class InteractionRail extends StatelessWidget {
  const InteractionRail({
    super.key,
    required this.items,
    this.itemGap = _defaultItemGap,
    this.buttonSize = _defaultButtonSize,
    this.iconSize = _defaultIconSize,
    this.countFontSize = _defaultCountFont,
    this.iconCountGap = _defaultIconCountGap,
  });

  final List<InteractionRailItem> items;
  final double itemGap;
  final double buttonSize;
  final double iconSize;
  final double countFontSize;
  final double iconCountGap;

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      children: [
        for (var index = 0; index < items.length; index++) ...[
          if (index > 0) SizedBox(height: itemGap),
          _RailButton(
            item: items[index],
            buttonSize: buttonSize,
            iconSize: iconSize,
            countFontSize: countFontSize,
            iconCountGap: iconCountGap,
          ),
        ],
      ],
    );
  }
}

class _RailButton extends StatelessWidget {
  const _RailButton({
    required this.item,
    required this.buttonSize,
    required this.iconSize,
    required this.countFontSize,
    required this.iconCountGap,
  });

  final InteractionRailItem item;
  final double buttonSize;
  final double iconSize;
  final double countFontSize;
  final double iconCountGap;

  @override
  Widget build(BuildContext context) {
    final tint = item.selected ? item.selectedColor : AppColors.onPrimary;
    return Column(
      key: item.key,
      mainAxisSize: MainAxisSize.min,
      children: [
        SizedBox.square(
          dimension: buttonSize,
          child: IconButton(
            onPressed: item.onTap,
            padding: EdgeInsets.zero,
            icon: item.asset != null
                ? Image.asset(
                    item.asset!,
                    width: iconSize,
                    height: iconSize,
                    fit: BoxFit.contain,
                    color: tint,
                    colorBlendMode: BlendMode.srcIn,
                  )
                : Transform.flip(
                    flipX: item.mirrorIcon,
                    child: Icon(item.icon, size: iconSize, color: tint),
                  ),
          ),
        ),
        SizedBox(height: iconCountGap),
        Text(
          item.count == null ? item.label : formatInteractionCount(item.count!),
          key: item.countKey,
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
          style: TextStyle(
            color: AppColors.onPrimary,
            height: 1,
            fontSize: countFontSize,
            fontWeight: FontWeight.w600,
            shadows: const [
              Shadow(blurRadius: 6, color: AppColors.mediaBlack),
            ],
          ),
        ),
      ],
    );
  }
}