import React, { useState, useRef, useEffect } from 'react';
import {
    PlusOutlined,
    CopyOutlined,
    LikeOutlined,
    DislikeOutlined,
    ArrowLeftOutlined,
    PaperClipOutlined,
    PhoneOutlined,
} from '@ant-design/icons';
import { Tooltip, message } from 'antd';
import ReactMarkdown from 'react-markdown';
import { useChatStore, Message } from '../store/chatStore';
import { sendChatMessage } from '../api';
import '../styles/index.scss';
import aiIcon from '@/assets/public/aiIcon.png';

export const ChatInterface: React.FC = () => {
    const {
        currentSessionId,
        sessions,
        selectedAppId,
        addMessage,
        addSession,
        updateCurrentSession,
        loading,
        setLoading,
    } = useChatStore();

    const [inputValue, setInputValue] = useState('');
    const [activeFeatures, setActiveFeatures] = useState<Set<string>>(new Set());
    const [abortController, setAbortController] = useState<AbortController | null>(null);
    const messagesEndRef = useRef<HTMLDivElement>(null);
    const inputRef = useRef<HTMLDivElement>(null);

    const currentSession = sessions.find((s) => s.id === currentSessionId);
    const messages = currentSession?.messages || [];

    useEffect(() => {
        messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
    }, [messages]);

    const handleSendMessage = async () => {
        if (!inputValue.trim() || loading) return;

        const userMessage: Message = {
            id: Date.now().toString(),
            role: 'user',
            content: inputValue.trim(),
            createTime: new Date().toISOString(),
        };

        let sessionId = currentSessionId;
        if (!sessionId) {
            const newSession = {
                id: Date.now().toString(),
                topic: inputValue.trim().slice(0, 20),
                appId: selectedAppId || undefined,
                messages: [userMessage],
                createTime: new Date().toISOString(),
            };
            addSession(newSession);
            sessionId = newSession.id;
            setInputValue('');
            return;
        }

        addMessage(sessionId, userMessage);
        const userText = inputValue.trim();
        setInputValue('');
        setLoading(true);

        const controller = new AbortController();
        setAbortController(controller);

        try {
            const assistantMessageId = (Date.now() + 1).toString();
            addMessage(sessionId, {
                id: assistantMessageId,
                role: 'assistant',
                content: '',
                createTime: new Date().toISOString(),
            });

            const response = await sendChatMessage({
                message: userText,
                appId: currentSession?.appId || selectedAppId || undefined,
                sessionId,
            });

            updateCurrentSession((session) => {
                const lastMsgIndex = session.messages.length - 1;
                if (lastMsgIndex >= 0 && session.messages[lastMsgIndex].id === assistantMessageId) {
                    session.messages[lastMsgIndex].content = response || '抱歉，我暂时无法回答这个问题。';
                }
            });
        } catch (error: any) {
            if (error.name === 'AbortError') {
                message.info('请求已取消');
            } else {
                message.error('发送失败，请重试');
            }
        } finally {
            setLoading(false);
            setAbortController(null);
        }
    };

    const handleCancel = () => {
        abortController?.abort();
        setLoading(false);
    };

    const handleKeyDown = (e: React.KeyboardEvent) => {
        if (e.key === 'Enter' && !e.shiftKey) {
            e.preventDefault();
            handleSendMessage();
        }
    };

    const handleCopy = (content: string) => {
        navigator.clipboard.writeText(content);
        message.success('复制成功');
    };

    const toggleFeature = (feature: string) => {
        setActiveFeatures((prev) => {
            const next = new Set(prev);
            if (next.has(feature)) {
                next.delete(feature);
            } else {
                next.add(feature);
            }
            return next;
        });
    };

    const handleSuggestionClick = (text: string) => {
        setInputValue(text);
        inputRef.current?.focus();
    };

    const handleBack = () => {
        window.close();
        setTimeout(() => {
            window.location.href = '/appCenter';
        }, 100);
    };

    const features = [
        { key: 'deep-think', label: '深度思考/思维链', icon: '🔬' },
        { key: 'search', label: '联网搜索', icon: '🌐' },
    ];

    const suggestions = [
        '专业知识',
        '职能管理',
        '项目级应用',
    ];

    return (
        <div className="chat-main">
            {/* Back Button */}
            <button className="back-btn" onClick={handleBack}>
                <ArrowLeftOutlined /> 开放平台
            </button>

            {/* Chat Messages */}
            <div className="chat-messages">
                {messages.length === 0 ? (
                    <WelcomeScreen
                        features={features}
                        activeFeatures={activeFeatures}
                        toggleFeature={toggleFeature}
                        suggestions={suggestions}
                        onSuggestionClick={handleSuggestionClick}
                        inputValue={inputValue}
                        setInputValue={setInputValue}
                        onSend={handleSendMessage}
                        loading={loading}
                        inputRef={inputRef}
                    />
                ) : (
                    <>
                        {messages.map((msg) => (
                            <div key={msg.id} className={`message-bubble ${msg.role}`}>
                                <div className="message-avatar">
                                    {msg.role === 'assistant' ? '🤖' : '👤'}
                                </div>
                                <div className="bubble-content">
                                    <ReactMarkdown>{msg.content}</ReactMarkdown>
                                    {msg.role === 'assistant' && (
                                        <div style={{ display: 'flex', gap: '8px', marginTop: '8px', opacity: 0.6 }}>
                                            <button onClick={() => handleCopy(msg.content)} style={{ background: 'none', border: 'none', cursor: 'pointer' }}>
                                                <CopyOutlined style={{ fontSize: '14px' }} />
                                            </button>
                                            <button style={{ background: 'none', border: 'none', cursor: 'pointer' }}>
                                                <LikeOutlined style={{ fontSize: '14px' }} />
                                            </button>
                                            <button style={{ background: 'none', border: 'none', cursor: 'pointer' }}>
                                                <DislikeOutlined style={{ fontSize: '14px' }} />
                                            </button>
                                        </div>
                                    )}
                                </div>
                            </div>
                        ))}
                        {loading && (
                            <div className="message-bubble assistant">
                                <div className="message-avatar">🤖</div>
                                <div className="bubble-content">
                                    <div className="loading-indicator">
                                        <div className="loading-dot"></div>
                                        <div className="loading-dot"></div>
                                        <div className="loading-dot"></div>
                                    </div>
                                </div>
                            </div>
                        )}
                        <div ref={messagesEndRef} />
                    </>
                )}
            </div>

            {/* Footer */}
            <div className="chat-footer">
                <div className="footer-content">
                    <span>内容由 AI 生成，请仔细甄别</span>
                    <span className="footer-divider">|</span>
                    <a className="footer-link" href="https://beian.miit.gov.cn/#/Integrated/index" target="_blank" rel="noopener noreferrer">
                        上海建科工程咨询有限公司
                    </a>
                </div>
            </div>
        </div>
    );
};

// Welcome Screen Component
interface WelcomeScreenProps {
    features: Array<{ key: string; label: string; icon: string; isNew?: boolean }>;
    activeFeatures: Set<string>;
    toggleFeature: (feature: string) => void;
    suggestions: string[];
    onSuggestionClick: (text: string) => void;
    inputValue: string;
    setInputValue: (value: string) => void;
    onSend: () => void;
    loading: boolean;
    inputRef: React.RefObject<HTMLDivElement>;
}

const WelcomeScreen: React.FC<WelcomeScreenProps> = ({
    features,
    activeFeatures,
    toggleFeature,
    suggestions,
    onSuggestionClick,
    inputValue,
    setInputValue,
    onSend,
    loading,
    inputRef,
}) => {
    return (
        <div className="welcome-screen">
            {/* Logo */}
            <div className="welcome-logo">
                <img src={aiIcon} alt="AI Icon" className="logo-icon" />
                <div className="logo-text">建科小智</div>
                <div className="logo-slogan">，智能问答</div>
            </div>

            {/* Input Container */}
            <div className="welcome-input-container">
                <div className="chat-input-wrapper">
                    <div
                        ref={inputRef}
                        className="input-placeholder"
                        contentEditable
                        onInput={(e) => setInputValue(e.currentTarget.textContent || '')}
                        onKeyDown={(e) => {
                            if (e.key === 'Enter' && !e.shiftKey) {
                                e.preventDefault();
                                onSend();
                            }
                        }}
                        suppressContentEditableWarning
                        data-placeholder="请输入你的问题或需求"
                    />

                    {/* Input Actions - 包含功能按钮和发送按钮 */}
                    <div className="input-actions">
                        <div className="left-actions">
                            {/* 附件按钮 */}
                            <button className="action-btn" title="上传附件">
                                <PaperClipOutlined />
                            </button>
                            
                            {/* 功能按钮 */}
                            {features.map((feature) => (
                                <button
                                    key={feature.key}
                                    className={`feature-btn ${activeFeatures.has(feature.key) ? 'active' : ''}`}
                                    onClick={() => toggleFeature(feature.key)}
                                    title={feature.label}
                                >
                                    <span className="feature-icon">{feature.icon}</span>
                                    <span className="feature-label">{feature.label}</span>
                                    {feature.isNew && <span className="new-tag">new</span>}
                                </button>
                            ))}
                        </div>
                        <div className="right-actions">
                            <button className="voice-btn" title="语音输入">
                                <PhoneOutlined />
                            </button>
                            <button 
                                className="send-btn" 
                                onClick={onSend}
                                disabled={!inputValue.trim() || loading}
                                title="发送"
                            >
                                <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor">
                                    <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z"/>
                                </svg>
                            </button>
                        </div>
                    </div>
                </div>
            </div>

            {/* Suggestion Tags */}
            <div className="suggestion-container">
                <div className="suggestion-title">我猜你在找...</div>
                <div className="suggestion-list">
                    {suggestions.map((text, index) => (
                        <div key={index} className="suggestion-item" onClick={() => onSuggestionClick(text)}>
                            {text}
                        </div>
                    ))}
                </div>
            </div>
        </div>
    );
};