'use client';
import SendSvg from '@/assets/icons/svg/send.svg';
import SunSvg from '@/assets/icons/svg/sun.svg';
import VideoSvg from '@/assets/icons/svg/video.svg';
import React, { Dispatch, SetStateAction, useCallback, useEffect, useRef, useState } from 'react';
import {
    EventSubscription,
    Keyboard,
    ScrollView,
    StyleSheet,
    TextInput,
    TouchableOpacity,
    View
} from 'react-native';

import { fetchApi } from '@/lib/server-api-util';
import { Message } from '@/types/ask';
import { ThemedText } from '../ThemedText';

interface Props {
    setIsHello: Dispatch<SetStateAction<boolean>>,
    conversationId: string | null,
    setUserMessages: Dispatch<SetStateAction<Message[]>>;
    setConversationId: (conversationId: string) => void,
    selectedImages: string[];
    setSelectedImages: Dispatch<SetStateAction<string[]>>;
}
export default function SendMessage(props: Props) {
    const { setIsHello, conversationId, setUserMessages, setConversationId, selectedImages, setSelectedImages } = props;

    // 用户询问
    const [inputValue, setInputValue] = useState('');

    // 创建新对话并获取消息
    const createNewConversation = useCallback(async (user_text: string) => {
        const data = await fetchApi<string>("/chat/new", {
            method: "POST",
        });
        setConversationId(data);
        await getConversation({ session_id: data, user_text, material_ids: [] });
    }, []);

    // 获取对话信息
    const getConversation = useCallback(async ({ session_id, user_text, material_ids }: { session_id: string, user_text: string, material_ids: string[] }) => {
        // 获取对话信息必须要有对话id
        if (!session_id) return;

        const response = await fetchApi<Message>(`/chat`, {
            method: "POST",
            body: JSON.stringify({
                session_id,
                user_text,
                material_ids
            })
        });
        setSelectedImages([]);
        setUserMessages((prev: Message[]) => [...prev, response]?.filter((item: Message) => item.content.text !== '正在寻找，请稍等...'));
    }, []);

    // 添加一个ref来跟踪键盘状态
    const keyboardDidShowListener = useRef<EventSubscription | null>(null);
    const keyboardDidHideListener = useRef<EventSubscription | null>(null);
    const isKeyboardVisible = useRef(false);

    useEffect(() => {
        // 使用keyboardWillShow而不是keyboardDidShow，这样可以在键盘完全显示前更新UI
        const showSubscription = Keyboard.addListener('keyboardWillShow', () => {
            isKeyboardVisible.current = true;
            if (!conversationId) {
                // 确保在下一个事件循环中更新状态，避免可能的渲染问题
                requestAnimationFrame(() => {
                    setIsHello(false);
                });
            }
        });

        const hideSubscription = Keyboard.addListener('keyboardWillHide', () => {
            isKeyboardVisible.current = false;
        });

        return () => {
            showSubscription.remove();
            hideSubscription.remove();
        };
    }, [conversationId]);

    // 发送询问
    const handleSubmit = useCallback(() => {
        const text = inputValue.trim();
        // 用户输入信息之后进行后续操作
        if (text) {
            // 将用户输入信息添加到消息列表中
            setUserMessages(pre => ([...pre, {
                content: {
                    text: text
                },
                role: 'User',
                timestamp: new Date().toISOString()
            },
            {
                content: {
                    text: "正在寻找，请稍等..."
                },
                role: 'Assistant',
                timestamp: new Date().toISOString()
            }
            ]));
            // 如果没有对话ID，创建新对话并获取消息，否则直接获取消息
            if (!conversationId) {
                createNewConversation(text);
            } else {
                getConversation({
                    session_id: conversationId,
                    user_text: text,
                    material_ids: selectedImages
                });
            }
            // 将输入框清空
            setInputValue('');
            // 只有在键盘可见时才关闭键盘
            if (isKeyboardVisible.current) {
                Keyboard.dismiss();
            }
        }
    }, [inputValue, conversationId, selectedImages, createNewConversation, getConversation]);

    return (
        <View style={styles.container}>
            <View className="relative w-full">
                <ScrollView horizontal={true}>
                    <TouchableOpacity style={[styles.button, { borderColor: '#FFB645' }]}>
                        <SunSvg width={18} height={18} />
                        <ThemedText>检索素材</ThemedText>
                    </TouchableOpacity><TouchableOpacity style={[styles.button, { borderColor: '#E2793F' }]}>
                        <VideoSvg width={18} height={18} />
                        <ThemedText>创作视频</ThemedText>
                    </TouchableOpacity>
                </ScrollView>
                <TextInput
                    style={styles.input}
                    placeholder="Ask MeMo Anything..."
                    placeholderTextColor="#999"
                    value={inputValue}
                    onChangeText={(text: string) => {
                        setInputValue(text);
                    }}
                    onSubmitEditing={handleSubmit}
                    // 调起的键盘类型
                    returnKeyType="send"
                />
                <TouchableOpacity
                    style={styles.voiceButton}
                    onPress={handleSubmit}
                    className={`absolute right-0 bottom-0`} // 使用绝对定位将按钮放在输入框内右侧
                >
                    <View style={{ transform: [{ rotate: '330deg' }] }}>
                        <SendSvg color={'white'} width={24} height={24} />
                    </View>
                </TouchableOpacity>
            </View>
        </View>
    );
}

const styles = StyleSheet.create({
    button: {
        paddingHorizontal: 8,
        paddingVertical: 4,
        margin: 5,
        borderRadius: 25,
        alignItems: 'center',
        borderWidth: 2,
        display: 'flex',
        flexDirection: 'row',
        gap: 5
    },
    container: {
        justifyContent: 'center',
        backgroundColor: '#transparent',
    },
    input: {
        borderColor: '#FF9500',
        borderWidth: 1,
        borderRadius: 25,
        paddingHorizontal: 20,
        paddingVertical: 12,
        fontSize: 16,
        width: '100%', // 确保输入框宽度撑满
        paddingRight: 50
    },
    voiceButton: {
        width: 40,
        height: 40,
        borderRadius: 20,
        backgroundColor: '#FF9500',
        justifyContent: 'center',
        alignItems: 'center',
        marginRight: 8, // 添加一点
    },
});