import React, { useState } from 'react';
import { DownOutlined, UpOutlined, BulbOutlined } from '@ant-design/icons';
import '../../styles/components/chat-with-llm/thinking-block.css';

interface ThinkingBlockProps {
    /** 思考过程内容 */
    content: string;
    /** 是否默认展开 */
    defaultExpanded?: boolean;
}

/**
 * 思考过程展示组件
 * 参考 GPT-5 和 Claude 网页版的思考过程UI设计
 * 可折叠的思考过程区域，契合当前淡绿色配色方案
 */
export default function ThinkingBlock({ content, defaultExpanded = false }: ThinkingBlockProps) {
    const [expanded, setExpanded] = useState(defaultExpanded);

    if (!content) return null;

    return (
        <div className="thinking-block">
            {/* 折叠/展开按钮 */}
            <div
                className="thinking-header"
                onClick={() => setExpanded(!expanded)}
                role="button"
                tabIndex={0}
                onKeyDown={(e) => {
                    if (e.key === 'Enter' || e.key === ' ') {
                        setExpanded(!expanded);
                    }
                }}
            >
                <div className="thinking-title">
                    <BulbOutlined className="thinking-icon" />
                    <span className="thinking-label">思考过程</span>
                </div>
                <div className="thinking-toggle">
                    {expanded ? (
                        <UpOutlined className="toggle-icon" />
                    ) : (
                        <DownOutlined className="toggle-icon" />
                    )}
                </div>
            </div>

            {/* 思考内容 */}
            {expanded && (
                <div className="thinking-content">
                    <div className="thinking-text">
                        {content.split('\n').map((line, index) => (
                            <p key={index} className="thinking-paragraph">
                                {line || '\u00A0'}
                            </p>
                        ))}
                    </div>
                </div>
            )}
        </div>
    );
}