nj/app/lib/features/class_/widgets/comment_bottom_sheet.dart

// 评语输入 BottomSheet — 老师点评学生日记
//
// 设计要点：
// - 7 个快捷评语模板，一键选择
// - 自由文字输入，支持多行
// - 温暖鼓励的语气（面向小学生日记）
// - 触摸目标 ≥ 44px

import 'package:flutter/material.dart';

/// 老师点评输入面板
class CommentBottomSheet extends StatefulWidget {
  final String journalId;
  final String studentName;
  final void Function(String content) onSubmit;

  const CommentBottomSheet({
    super.key,
    required this.journalId,
    required this.studentName,
    required this.onSubmit,
  });

  @override
  State<CommentBottomSheet> createState() => _CommentBottomSheetState();
}

class _CommentBottomSheetState extends State<CommentBottomSheet> {
  final _controller = TextEditingController();
  final _focusNode = FocusNode();
  bool _isSubmitting = false;

  // 快捷评语模板 — 温暖鼓励风格
  static const _quickComments = [
    '🌟 写得真好！继续加油！',
    '📖 故事很精彩，想象力很丰富！',
    '💪 字写得很工整，继续保持！',
    '🎨 画得很漂亮，很有创意！',
    '🌈 内容很丰富，观察很仔细！',
    '✍️ 可以再多写一点自己的感受哦',
    '📸 照片拍得很好，记录很用心！',
  ];

  @override
  void initState() {
    super.initState();
    Future.microtask(() => _focusNode.requestFocus());
  }

  @override
  void dispose() {
    _controller.dispose();
    _focusNode.dispose();
    super.dispose();
  }

  void _submit() {
    final content = _controller.text.trim();
    if (content.isEmpty) return;

    setState(() => _isSubmitting = true);
    widget.onSubmit(content);
    Navigator.pop(context);
  }

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);

    return Container(
      constraints: BoxConstraints(
        maxHeight: MediaQuery.of(context).size.height * 0.7,
      ),
      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.symmetric(vertical: 8),
              width: 40,
              height: 4,
              decoration: BoxDecoration(
                color: Colors.grey.shade300,
                borderRadius: BorderRadius.circular(2),
              ),
            ),
          ),
          // 标题
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 20),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  '点评 ${widget.studentName} 的日记',
                  style: theme.textTheme.titleSmall,
                ),
                IconButton(
                  icon: const Icon(Icons.close, size: 20),
                  onPressed: () => Navigator.pop(context),
                  padding: EdgeInsets.zero,
                  constraints: const BoxConstraints(),
                ),
              ],
            ),
          ),
          const SizedBox(height: 8),

          // 快捷评语
          SizedBox(
            height: 80,
            child: ListView(
              scrollDirection: Axis.horizontal,
              padding: const EdgeInsets.symmetric(horizontal: 16),
              children: _quickComments.map((comment) {
                return Padding(
                  padding: const EdgeInsets.only(right: 8),
                  child: ActionChip(
                    label: Text(comment, style: const TextStyle(fontSize: 12)),
                    onPressed: () {
                      _controller.text = comment;
                      _focusNode.requestFocus();
                    },
                  ),
                );
              }).toList(),
            ),
          ),
          const SizedBox(height: 8),

          // 输入框
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: TextField(
              controller: _controller,
              focusNode: _focusNode,
              maxLines: 3,
              minLines: 1,
              textInputAction: TextInputAction.done,
              onSubmitted: (_) => _submit(),
              decoration: InputDecoration(
                hintText: '写下你的评语...',
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(10),
                  borderSide: BorderSide(color: Colors.grey.shade300),
                ),
                enabledBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(10),
                  borderSide: BorderSide(color: Colors.grey.shade300),
                ),
                focusedBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(10),
                  borderSide: BorderSide(
                    color: theme.colorScheme.primary,
                    width: 2,
                  ),
                ),
              ),
            ),
          ),
          const SizedBox(height: 12),

          // 提交按钮
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: SizedBox(
              width: double.infinity,
              height: 44,
              child: FilledButton(
                onPressed: _isSubmitting ? null : _submit,
                child: _isSubmitting
                    ? const SizedBox(
                        width: 20,
                        height: 20,
                        child: CircularProgressIndicator(strokeWidth: 2),
                      )
                    : const Text('发布评语'),
              ),
            ),
          ),
          const SizedBox(height: 16),
        ],
      ),
    );
  }
}