<template>
    <div class="alarm-table-container">
        <div class="alarm-table-header">
            <div class="header-item">报警时间</div>
            <div class="header-item">设备类型</div>
            <div class="header-item">设备IMEI</div>
            <div class="header-item">报警事件</div>
            <div class="header-item">报警位置</div>
        </div>
        <div class="alarm-table-body">
            <div ref="tableBody" class="alarm-table-body-inner">
                <!-- 第一份数据 -->
                <div v-for="(item, index) in displayData" :key="`first-${getKey(item, index)}`" class="alarm-item">
                    <div class="item-cell">{{ item.startTime }}</div>
                    <div class="item-cell">{{ item.deviceTypeName }}</div>
                    <div class="item-cell">{{ item.deviceImei }}</div>
                    <div class="item-cell alarm-event">
                        {{ getEventName(item.deviceAction) }}
                    </div>
                    <div class="item-cell loaction">{{ item.location }}</div>
                </div>
                <!-- 第二份数据（用于无缝滚动） -->
                <div v-for="(item, index) in displayData" :key="`second-${getKey(item, index)}`" class="alarm-item">
                    <div class="item-cell">{{ item.startTime }}</div>
                    <div class="item-cell">{{ item.deviceTypeName }}</div>
                    <div class="item-cell">{{ item.deviceImei }}</div>
                    <div class="item-cell alarm-event">
                        {{ getEventName(item.deviceAction) }}
                    </div>
                    <div class="item-cell loaction">{{ item.location }}</div>
                </div>
            </div>
        </div>
    </div>
</template>

<script setup>
import { getRealtimeAlarm } from '@/api/homeIndex/index';

let alarmTimer = null;
const alarmData = ref([]);
const displayData = ref([]); // 显示的数据（复制一份用于无缝滚动）
const tableBody = ref(null);
const isScrolling = ref(true);
const animationId = ref(null);
const scrollPosition = ref(0);
const itemHeight = ref(0); // 动态计算每个条目的高度

// 获取报警事件名称
const getEventName = (action) => {
    const eventMap = {
        0: '强制报警',
        1: '撞击闯入',
        2: '自动报警',
        3: '电子围栏告警'
    };
    return eventMap[action] || '未知报警';
};

// 获取实时报警数据
const getRealtimeAlarmData = () => {
    getRealtimeAlarm().then((res) => {
        if (res.data && res.data.length > 0) {
            // 新数据插入到最前面
            alarmData.value = [...res.data, ...alarmData.value];
            
            // 限制数据量，避免性能问题
            if (alarmData.value.length > 10) {
                alarmData.value = alarmData.value.slice(0, 10);
            }
            // 更新显示数据
            updateDisplayData();
            // 新数据插入时重置滚动位置
            scrollPosition.value = 0;
            if (tableBody.value) {
                tableBody.value.style.transform = `translateY(0)`;
            }
        }
    });
};

// 更新显示数据（复制一份用于无缝滚动）
const updateDisplayData = () => {
    displayData.value = [...alarmData.value];
    // 计算每个条目的实际高度
    nextTick(() => {
        const items = document.querySelectorAll('.alarm-item');
        if (items.length > 0) {
            itemHeight.value = items[0].offsetHeight;
        }
    });
};

// 生成唯一的key
const getKey = (item, index) => {
    return `${item.deviceImei}_${item.startTime}_${index}`;
};

// 开始滚动动画
const startScroll = () => {
    if (!tableBody.value || displayData.value.length === 0) return;
    stopScroll(); // 先停止之前的动画
    const scrollSpeed = 0.3; // 滚动速度
    const animate = () => {
        if (!isScrolling.value) {
            animationId.value = requestAnimationFrame(animate);
            return;
        }
        
        scrollPosition.value += scrollSpeed;
        
        // 当滚动超过一份数据的高度时，重置位置
        if (itemHeight.value > 0 && scrollPosition.value >= itemHeight.value * displayData.value.length) {
            scrollPosition.value = 0;
        }
        
        // 应用滚动效果
        if (tableBody.value) {
            tableBody.value.style.transform = `translateY(-${scrollPosition.value}px)`;
        }
        
        animationId.value = requestAnimationFrame(animate);
    };
    
    animationId.value = requestAnimationFrame(animate);
};

// 停止滚动动画
const stopScroll = () => {
    if (animationId.value) {
        cancelAnimationFrame(animationId.value);
        animationId.value = null;
    }
};

// 开始报警定时器
const startAlarmTimer = () => {
    if (alarmTimer) {
        clearInterval(alarmTimer);
    }
    getRealtimeAlarmData();
    alarmTimer = setInterval(getRealtimeAlarmData, 30 * 10000);
};

// 清除报警定时器
const clearAlarmTimer = () => {
    if (alarmTimer) {
        clearInterval(alarmTimer);
        alarmTimer = null;
    }
};

// 监听数据变化
watch(displayData, (newData) => {
    if (newData.length > 0) {
        // 延迟一点确保DOM已更新
        setTimeout(() => {
            startScroll();
        }, 100);
    }
});

onMounted(() => {
    startAlarmTimer();
});

onUnmounted(() => {
    clearAlarmTimer();
    stopScroll();
});
</script>

<style scoped lang="scss">
.alarm-table-container {
    width: 100%;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 4vh;
    padding: 1vw 0vw;
}

.alarm-table-header {
    display: flex;
    color: #00C0FF;
    border-bottom: 1px dashed rgba(100, 150, 200, 0.3);
    font-size: 0.8vw;
    background-color: #0C2644;
}

.header-item {
    flex: 1;
    padding: 8px;
    text-align: center;
}

.alarm-table-body {
    height: 18vh;
    overflow: hidden;
    color: #fff;
    position: relative;
}

.alarm-table-body-inner {
    transition: transform 0.1s linear;
}

.alarm-item {
    display: flex;
    border-bottom: 1px dashed rgba(100, 150, 200, 0.3);
    font-size: 0.6vw;
    align-items: center;
    padding: 0.8vw;
    height: 7vh;
    box-sizing: border-box;
}

.item-cell {
    flex: 1;
    text-align: center;
}

.alarm-event {
    color: #ff5252;
}

/* 隐藏滚动条 */
.alarm-table-body::-webkit-scrollbar {
    display: none;
}

.alarm-table-body {
    -ms-overflow-style: none;
    scrollbar-width: none;
}
</style>