// src/components/NotificationContainer/index.js
/**
 * 通知容器组件 - 右下角层叠显示实时通知
 */

import React from 'react';
import {
    Box,
    VStack,
    HStack,
    Text,
    IconButton,
    Icon,
    useColorModeValue,
    Slide,
    ScaleFade,
} from '@chakra-ui/react';
import { MdClose, MdCheckCircle, MdError, MdWarning, MdInfo } from 'react-icons/md';
import { useNotification } from '../../contexts/NotificationContext';

// 通知类型对应的图标和颜色
const NOTIFICATION_STYLES = {
    success: {
        icon: MdCheckCircle,
        colorScheme: 'green',
        bg: 'green.50',
        borderColor: 'green.400',
        iconColor: 'green.500',
    },
    error: {
        icon: MdError,
        colorScheme: 'red',
        bg: 'red.50',
        borderColor: 'red.400',
        iconColor: 'red.500',
    },
    warning: {
        icon: MdWarning,
        colorScheme: 'orange',
        bg: 'orange.50',
        borderColor: 'orange.400',
        iconColor: 'orange.500',
    },
    info: {
        icon: MdInfo,
        colorScheme: 'blue',
        bg: 'blue.50',
        borderColor: 'blue.400',
        iconColor: 'blue.500',
    },
};

/**
 * 单个通知项组件
 */
const NotificationItem = ({ notification, onClose, isNewest = false }) => {
    const { id, severity = 'info', title, message } = notification;
    const style = NOTIFICATION_STYLES[severity] || NOTIFICATION_STYLES.info;

    const bgColor = useColorModeValue(style.bg, `${style.colorScheme}.900`);
    const borderColor = useColorModeValue(style.borderColor, `${style.colorScheme}.500`);
    const textColor = useColorModeValue('gray.800', 'white');
    const subTextColor = useColorModeValue('gray.600', 'gray.300');

    return (
        <ScaleFade initialScale={0.9} in={true}>
            <Box
                bg={bgColor}
                borderLeft="4px solid"
                borderColor={borderColor}
                borderRadius="md"
                boxShadow={isNewest ? '2xl' : 'lg'}  // 最新消息更强的阴影
                p={4}
                minW="350px"
                maxW="450px"
                position="relative"
                _hover={{
                    boxShadow: 'xl',
                    transform: 'translateX(-4px)',
                }}
                transition="all 0.2s"
                // 最新消息添加微妙的高亮边框
                {...(isNewest && {
                    borderRight: '1px solid',
                    borderRightColor: borderColor,
                    borderTop: '1px solid',
                    borderTopColor: useColorModeValue(`${style.colorScheme}.100`, `${style.colorScheme}.700`),
                })}
            >
                <HStack spacing={3} align="start">
                    {/* 图标 */}
                    <Icon
                        as={style.icon}
                        w={6}
                        h={6}
                        color={style.iconColor}
                        mt={0.5}
                        flexShrink={0}
                    />

                    {/* 内容 */}
                    <VStack align="start" spacing={1} flex={1} mr={6}>
                        <Text
                            fontSize="md"
                            fontWeight="bold"
                            color={textColor}
                            lineHeight="short"
                        >
                            {title}
                        </Text>
                        {message && (
                            <Text
                                fontSize="sm"
                                color={subTextColor}
                                lineHeight="short"
                            >
                                {message}
                            </Text>
                        )}
                    </VStack>

                    {/* 关闭按钮 */}
                    <IconButton
                        icon={<MdClose />}
                        size="sm"
                        variant="ghost"
                        colorScheme={style.colorScheme}
                        aria-label="关闭通知"
                        onClick={() => onClose(id)}
                        position="absolute"
                        top={2}
                        right={2}
                        _hover={{
                            bg: useColorModeValue(`${style.colorScheme}.100`, `${style.colorScheme}.800`),
                        }}
                    />
                </HStack>
            </Box>
        </ScaleFade>
    );
};

/**
 * 通知容器组件 - 主组件
 */
const NotificationContainer = () => {
    const { notifications, removeNotification } = useNotification();

    // 如果没有通知，不渲染
    if (notifications.length === 0) {
        return null;
    }

    return (
        <Box
            position="fixed"
            bottom={6}
            right={6}
            zIndex={9999}
            pointerEvents="none"
        >
            <VStack
                spacing={3}  // 消息之间间距 12px
                align="flex-end"
                pointerEvents="auto"
            >
                {notifications.map((notification, index) => (
                    <Slide
                        key={notification.id}
                        direction="right"
                        in={true}
                        style={{
                            position: 'relative',
                            zIndex: 9999 - index,  // 最新消息（index=0）z-index最高
                        }}
                    >
                        <NotificationItem
                            notification={notification}
                            onClose={removeNotification}
                            isNewest={index === 0}  // 第一条消息是最新的
                        />
                    </Slide>
                ))}
            </VStack>
        </Box>
    );
};

export default NotificationContainer;