import React, { useState } from 'react';
import { Card, Collapse, Tag, Spin, Typography, Button } from 'antd';
import { ToolOutlined, ThunderboltOutlined, CheckCircleOutlined, LoadingOutlined } from '@ant-design/icons';
import type { ThoughtItem } from '../../types/dify_chat';
import Markdown from './markdown';
import '../../styles/components/chat-with-llm/thought-process.css';

const { Panel } = Collapse;
const { Text, Paragraph } = Typography;

interface ThoughtProcessProps {
    thought: ThoughtItem;
    isFinished: boolean;
    allToolIcons?: Record<string, string>;
}

/**
 * 思考过程组件
 * 展示AI的思考过程和工具调用
 */
export default function ThoughtProcess({
    thought,
    isFinished,
    allToolIcons = {}
}: ThoughtProcessProps) {
    const [expanded, setExpanded] = useState(false);

    const { tool_name, tool_input, tool_output, thought: thoughtText, observation } = thought;

    /**
     * 获取工具图标
     */
    const getToolIcon = (toolName?: string) => {
        if (!toolName) return <ToolOutlined />;

        // 如果有自定义图标映射
        if (allToolIcons[toolName]) {
            return <span>{allToolIcons[toolName]}</span>;
        }

        // 根据工具名称返回默认图标
        switch (toolName.toLowerCase()) {
            case 'search':
            case 'web_search':
                return '🔍';
            case 'calculator':
            case 'math':
                return '🧮';
            case 'code':
            case 'python':
                return '💻';
            case 'image':
            case 'vision':
                return '👁️';
            case 'file':
            case 'document':
                return '📄';
            default:
                return <ToolOutlined />;
        }
    };

    /**
     * 获取状态图标和颜色
     */
    const getStatusInfo = () => {
        if (isFinished && observation) {
            return {
                icon: <CheckCircleOutlined />,
                color: 'success',
                text: '已完成'
            };
        } else if (!isFinished) {
            return {
                icon: <LoadingOutlined spin />,
                color: 'processing',
                text: '执行中'
            };
        } else {
            return {
                icon: <ThunderboltOutlined />,
                color: 'default',
                text: '等待中'
            };
        }
    };

    const statusInfo = getStatusInfo();

    /**
     * 格式化工具输入
     */
    const formatToolInput = (input?: string) => {
        if (!input) return '无输入参数';

        try {
            const parsed = JSON.parse(input);
            return (
                <pre className="bg-gray-50 p-2 rounded text-sm overflow-x-auto">
                    {JSON.stringify(parsed, null, 2)}
                </pre>
            );
        } catch {
            return <Text code>{input}</Text>;
        }
    };

    /**
     * 格式化工具输出
     */
    const formatToolOutput = (output?: string) => {
        if (!output) return '暂无输出';

        try {
            const parsed = JSON.parse(output);
            return (
                <pre className="bg-gray-50 p-2 rounded text-sm overflow-x-auto">
                    {JSON.stringify(parsed, null, 2)}
                </pre>
            );
        } catch {
            return <Markdown content={output} />;
        }
    };

    return (
        <Card
            size="small"
            className="my-2 border-l-4 border-l-blue-400 bg-blue-50"
            bodyStyle={{ padding: '12px' }}
        >
            <div className="flex items-center justify-between mb-2">
                <div className="flex items-center gap-2">
                    <span className="text-lg">{getToolIcon(tool_name)}</span>
                    <Text strong className="text-blue-700">
                        {tool_name || '工具调用'}
                    </Text>
                    <Tag
                        color={statusInfo.color as any}
                        icon={statusInfo.icon}
                        className="ml-2"
                    >
                        {statusInfo.text}
                    </Tag>
                </div>

                {(tool_input || tool_output) && (
                    <Button
                        type="text"
                        size="small"
                        onClick={() => setExpanded(!expanded)}
                        className="text-blue-600"
                    >
                        {expanded ? '收起详情' : '查看详情'}
                    </Button>
                )}
            </div>

            {/* 思考内容 */}
            {thoughtText && (
                <div className="mb-2">
                    <Markdown content={thoughtText} />
                </div>
            )}

            {/* 工具详情 */}
            {expanded && (tool_input || tool_output) && (
                <Collapse
                    ghost
                    size="small"
                    className="bg-white rounded"
                >
                    {tool_input && (
                        <Panel
                            header={
                                <span className="text-sm font-medium text-gray-600">
                                    📥 输入参数
                                </span>
                            }
                            key="input"
                        >
                            {formatToolInput(tool_input)}
                        </Panel>
                    )}

                    {tool_output && (
                        <Panel
                            header={
                                <span className="text-sm font-medium text-gray-600">
                                    📤 执行结果
                                </span>
                            }
                            key="output"
                        >
                            {formatToolOutput(tool_output)}
                        </Panel>
                    )}
                </Collapse>
            )}

            {/* 观察结果 */}
            {observation && observation !== tool_output && (
                <div className="mt-2 p-2 bg-green-50 rounded border border-green-200">
                    <Text className="text-green-700 text-sm font-medium">💡 观察结果：</Text>
                    <div className="mt-1">
                        <Markdown content={observation} />
                    </div>
                </div>
            )}

            {/* 加载状态 */}
            {!isFinished && !observation && (
                <div className="flex items-center justify-center py-2 text-blue-600">
                    <Spin size="small" className="mr-2" />
                    <Text className="text-sm">正在执行工具调用...</Text>
                </div>
            )}
        </Card>
    );
}