document.addEventListener('DOMContentLoaded', function () {
    var chartContainer = document.getElementById('chart-container');
    var myChart = echarts.init(chartContainer);

    var timestamps = [], temperatures = [];

    function fetchInitialData() {
        fetch('http://111.230.197.156:8000/get_sensor_data')
            .then(response => response.json())
            .then(data => {
                timestamps = data.timestamps.slice(-200); // 只保留最新的200个时间戳
                temperatures = data.temperatures.slice(-200); // 只保留最新的200个温度数据

                updateChart();
            });
    }

    function fetchLatestData() {
        fetch('http://111.230.197.156:8000/get_latest_sensor_data')
            .then(response => response.json())
            .then(data => {
                // 如果已有200个数据则移除最旧的一条
                if (timestamps.length >= 200) {
                    timestamps.shift();
                    temperatures.shift();
                }

                // 添加新的数据
                timestamps.push(data.timestamps);
                temperatures.push(data.temperature);

                updateChart();
            });
    }

    function updateChart() {
        var option = {
            title: { text: '温度数据', textStyle: { color: 'white' } },
            tooltip: { trigger: 'axis' },
            legend: { data: ['温度'], textStyle: { color: 'white' } },
            xAxis: { type: 'category', data: timestamps, axisLabel: { color: 'white' } },
            yAxis: { type: 'value', axisLabel: { color: 'white' } },
            series: [{ name: '温度', type: 'line', data: temperatures }]
        };
        myChart.setOption(option);
        document.getElementById('temperature').textContent = `当前温度: ${temperatures[temperatures.length - 1]}℃`;
    }

    // 初始化时获取所有数据
    fetchInitialData();

    // 每5秒获取最新的数据
    setInterval(fetchLatestData, 1000);
});