<template>
    <div class="chart-container">
        <!-- 图表标题和时间范围选择器 -->
        <div class="chart-header">
            <h2>功率与效率趋势</h2>
            <div class="chart-actions">
                <button @click="timeRange = 'day'" :class="{ active: timeRange === 'day' }">今日</button>
                <button @click="timeRange = 'week'" :class="{ active: timeRange === 'week' }">本周</button>
                <button @click="timeRange = 'month'" :class="{ active: timeRange === 'month' }">本月</button>
            </div>
        </div>
        <!-- 图表内容区域 -->
        <div ref="chartRef" class="chart-content"></div>
    </div>
</template>

<script setup>
import { ref, onMounted, watch } from 'vue';
import * as echarts from 'echarts';

// 图表DOM引用
const chartRef = ref(null);
// 时间范围状态
const timeRange = ref('day');
// 图表实例
let chartInstance = null;

// 定义颜色常量
const POWER_COLOR = 'rgba(42, 130, 228, 1)';
const EFFICIENCY_COLOR = 'rgba(67, 207, 124, 1)';

// 生成指定范围内的随机数（用于模拟数据）
const getRandomValue = (min, max) => {
    return Math.floor(Math.random() * (max - min + 1)) + min;
};

// 生成指定范围内的随机浮点数（用于效率数据）
const getRandomFloat = (min, max, decimalPlaces = 1) => {
    const value = Math.random() * (max - min) + min;
    return parseFloat(value.toFixed(decimalPlaces));
};

// 获取当前月份的天数
const getDaysInCurrentMonth = () => {
    const now = new Date();
    const year = now.getFullYear();
    const month = now.getMonth() + 1; // 月份从0开始，所以+1
    return new Date(year, month, 0).getDate();
};

// 根据时间范围返回对应的数据
const getChartData = () => {
    if (timeRange.value === 'day') {
        return {
            xAxis: ['00:00', '03:00', '06:00', '09:00', '12:00', '15:00', '18:00', '21:00'],
            powerData: [320, 380, 350, 420, 580, 630, 550, 480],
            efficiencyData: [85.2, 86.5, 87.1, 88.3, 89.5, 89.2, 88.7, 88.1]
        };
    } else if (timeRange.value === 'week') {
        return {
            xAxis: ['周一', '周二', '周三', '周四', '周五', '周六', '周日'],
            powerData: [4200, 4800, 5100, 4900, 5300, 3800, 3200],
            efficiencyData: [86.2, 87.5, 88.1, 87.8, 89.0, 88.5, 87.9]
        };
    } else {
        // 本月数据 - 按天显示
        const daysInMonth = getDaysInCurrentMonth();
        const xAxis = [];
        const powerData = [];
        const efficiencyData = [];

        // 生成每天的数据
        for (let i = 1; i <= daysInMonth; i++) {
            xAxis.push(`${i}日`);
            // 生成合理范围内的功率数据（10000-25000之间）
            powerData.push(getRandomValue(10000, 25000));
            // 生成合理范围内的效率数据（85-90之间，保留1位小数）
            efficiencyData.push(getRandomFloat(85, 90));
        }

        return {
            xAxis,
            powerData,
            efficiencyData
        };
    }
};

// 初始化图表
const initChart = () => {
    if (chartRef.value && !chartInstance) {
        chartInstance = echarts.init(chartRef.value);
    }

    const data = getChartData();

    const option = {
        tooltip: {
            trigger: 'axis',
            axisPointer: { type: 'cross' }
        },
        legend: {
            data: ['总功率(kW)', '平均效率(%)'],
            top: 0
        },
        grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
        },
        xAxis: {
            type: 'category',
            boundaryGap: false,
            data: data.xAxis,
            // 当月天数较多时，优化X轴标签显示
            axisLabel: {
                interval: timeRange.value === 'month' ? 'auto' : 0,
                rotate: timeRange.value === 'month' ? 45 : 0
            }
        },
        yAxis: [
            {
                type: 'value',
                name: '总功率(kW)',
                axisLabel: {
                    formatter: '{value}'
                }
            },
            {
                type: 'value',
                name: '平均效率(%)',
                min: 80,
                max: 95,
                axisLabel: {
                    formatter: '{value}%'
                }
            }
        ],
        series: [
            {
                name: '总功率(kW)',
                type: 'line',
                data: data.powerData,
                smooth: true,
                lineStyle: {
                    width: 3,
                    color: POWER_COLOR
                },
                symbol: 'circle',
                symbolSize: 8,
                itemStyle: {
                    color: POWER_COLOR
                },
                markPoint: {
                    data: [
                        { type: 'max', name: '最大值' },
                        { type: 'min', name: '最小值' }
                    ],
                    itemStyle: {
                        color: POWER_COLOR
                    }
                }
            },
            {
                name: '平均效率(%)',
                type: 'line',
                yAxisIndex: 1,
                data: data.efficiencyData,
                smooth: true,
                lineStyle: {
                    width: 3,
                    type: 'dashed',
                    color: EFFICIENCY_COLOR
                },
                symbol: 'diamond',
                symbolSize: 8,
                itemStyle: {
                    color: EFFICIENCY_COLOR
                },
                markPoint: {
                    data: [
                        { type: 'max', name: '最大值' },
                        { type: 'min', name: '最小值' }
                    ],
                    itemStyle: {
                        color: EFFICIENCY_COLOR
                    }
                }
            }
        ]
    };

    chartInstance.setOption(option);
};

// 响应窗口大小变化
const handleResize = () => {
    if (chartInstance) {
        chartInstance.resize();
    }
};

// 生命周期钩子
onMounted(() => {
    initChart();
    window.addEventListener('resize', handleResize);

    // 清理函数
    return () => {
        window.removeEventListener('resize', handleResize);
        if (chartInstance) {
            chartInstance.dispose();
            chartInstance = null;
        }
    };
});

// 监听时间范围变化，更新图表
watch(timeRange, () => {
    initChart();
});
</script>

<style scoped>
.chart-container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    height: 400px;
    width: 100%;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid #f0f0f0;
}

.chart-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin: 0;
}

.chart-actions button {
    background: none;
    border: 1px solid #e0e0e0;
    padding: 5px 12px;
    border-radius: 4px;
    margin-left: 8px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s ease;
}

.chart-actions button.active {
    background-color: #1890ff;
    color: white;
    border-color: #1890ff;
}

.chart-content {
    width: 100%;
    height: calc(100% - 54px);
    padding: 10px;
}

@media (max-width: 768px) {
    .chart-container {
        height: 350px;
    }
}

@media (max-width: 480px) {
    .chart-container {
        height: 300px;
    }

    .chart-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    .chart-actions {
        width: 100%;
        display: flex;
        justify-content: space-between;
    }

    .chart-actions button {
        margin: 0;
        flex: 1;
        margin-right: 5px;
    }

    .chart-actions button:last-child {
        margin-right: 0;
    }
}

.model {
    padding: 20px;
    background-color: rgba(242, 248, 252, 1);
}
</style>
