// 分享 BottomSheet — 编辑器完成后选择分享到班级或仅自己可见
//
// 设计要点：
// - 温暖友好的文案（面向小学生）
// - 分享到班级（有班级时显示）/ 仅自己可见
// - 无班级时提示加入班级后可分享
// - 分享前自动进行内容安全检查（敏感词过滤）

import 'package:flutter/material.dart';

import '../../../data/services/content_filter_service.dart';

/// 编辑器完成后的分享选择面板
class ShareBottomSheet extends StatelessWidget {
  final String? classId;
  final String className;
  final void Function(bool shareToClass) onDecision;

  /// 用于内容安全检查的文本内容（标题 + 文本元素）
  final String contentText;

  const ShareBottomSheet({
    super.key,
    required this.classId,
    required this.className,
    required this.onDecision,
    this.contentText = '',
  });

  @override
  Widget build(BuildContext context) {
    final hasClass = classId != null && classId!.isNotEmpty;
    final theme = Theme.of(context);

    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: theme.colorScheme.surface,
        borderRadius: const BorderRadius.vertical(top: Radius.circular(22)),
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          // 拖拽条
          Center(
            child: Container(
              margin: const EdgeInsets.only(bottom: 16),
              width: 40,
              height: 4,
              decoration: BoxDecoration(
                color: Colors.grey.shade300,
                borderRadius: BorderRadius.circular(2),
              ),
            ),
          ),
          Text(
            '日记写好了！',
            style: theme.textTheme.titleMedium,
          ),
          const SizedBox(height: 8),
          Text(
            '要分享给老师和同学们看看吗？',
            style: theme.textTheme.bodyMedium?.copyWith(
              color: Colors.grey.shade600,
            ),
          ),
          const SizedBox(height: 24),

          // 分享到班级
          if (hasClass) ...[
            SizedBox(
              width: double.infinity,
              height: 52,
              child: FilledButton.icon(
                onPressed: () => _handleShare(context, shareToClass: true),
                icon: const Icon(Icons.group),
                label: Text('分享到 $className'),
                style: FilledButton.styleFrom(
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12),
                  ),
                ),
              ),
            ),
            const SizedBox(height: 12),
          ],

          // 仅自己可见
          SizedBox(
            width: double.infinity,
            height: 52,
            child: OutlinedButton.icon(
              onPressed: () => _handleShare(context, shareToClass: false),
              icon: const Icon(Icons.lock_outline),
              label: const Text('仅自己可见'),
              style: OutlinedButton.styleFrom(
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(12),
                ),
              ),
            ),
          ),

          // 无班级时的提示
          if (!hasClass) ...[
            const SizedBox(height: 12),
            Text(
              '加入班级后可以分享给老师和同学哦',
              style: theme.textTheme.bodySmall?.copyWith(
                color: Colors.grey.shade500,
              ),
            ),
          ],

          const SizedBox(height: 8),
        ],
      ),
    );
  }

  /// 处理分享/保存决定
  void _handleShare(BuildContext context, {required bool shareToClass}) {
    // 仅在分享到班级时进行内容安全检查
    if (shareToClass && contentText.isNotEmpty) {
      final matches = ContentFilterService.checkText(contentText);
      if (matches.isNotEmpty) {
        _showContentWarning(context, matches);
        return;
      }
    }
    // 安全或仅自己可见 → 直接执行
    onDecision(shareToClass);
    Navigator.pop(context);
  }

  /// 显示内容安全警告对话框
  void _showContentWarning(
    BuildContext context,
    List<SensitiveWordMatch> matches,
  ) {
    final categories = ContentFilterService.getMatchedCategories(matches);
    final words = matches.map((m) => ' "${m.word}"').toSet().toList();
    final wordList = words.take(5).join('、');
    final categoryList = categories.join('、');

    showDialog(
      context: context,
      builder: (dialogContext) => AlertDialog(
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
        title: const Row(
          children: [
            Icon(Icons.warning_amber_rounded, color: Colors.orange),
            SizedBox(width: 8),
            Text('内容提醒'),
          ],
        ),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('日记中可能包含不太合适分享的内容：'),
            const SizedBox(height: 8),
            Text(
              wordList,
              style: const TextStyle(fontWeight: FontWeight.w600),
            ),
            const SizedBox(height: 4),
            Text(
              '涉及：$categoryList',
              style: TextStyle(fontSize: 13, color: Colors.grey.shade600),
            ),
            const SizedBox(height: 12),
            const Text(
              '建议修改后再分享，或者先保存为仅自己可见。',
              style: TextStyle(fontSize: 13),
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(dialogContext),
            child: const Text('返回修改'),
          ),
          TextButton(
            onPressed: () {
              Navigator.pop(dialogContext); // 关闭对话框
              onDecision(true); // 仍然分享
              Navigator.pop(context); // 关闭 BottomSheet
            },
            child: const Text('仍然分享'),
          ),
        ],
      ),
    );
  }
}