import * as echarts from 'echarts'

function getStartTime(timestamp) {
    return new Date(new Date(timestamp).toLocaleDateString()).getTime();
}

function renderItem(params, api) {
    var categoryIndex = api.value(0);
    var start = api.coord([api.value(1), categoryIndex]);
    var end = api.coord([api.value(2), categoryIndex]);

    var height = api.size([0, 1])[1] * 2;
    var rectShape = echarts.graphic.clipRectByRect(
        {
            x: start[0],
            y: start[1] - height / 2,
            width: end[0] - start[0],
            height: height,
        },
        {
            x: params.coordSys.x,
            y: params.coordSys.y - 16,
            width: params.coordSys.width,
            height: params.coordSys.height,
        }
    );

    return (
        rectShape && {
            type: 'rect',
            transition: ['shape'],
            shape: rectShape,
            style: api.style(),
        }
    );
}

// unused
function getXaxisRange(startTime) {
    return Array(24)
        .fill(startTime)
        .map((item, index) => {
            return new Date(item + index * 3600 * 1000)
                .toLocaleTimeString()
                .split(':')
                .slice(0, 2)
                .join(':');
        });
}

function getTodayStart(today) {
    const [y, m, d] = [
        today.getFullYear(),
        today.getMonth(),
        today.getDate(),
    ];
    // debugger;
    return new Date(y, m, d).getTime();
}


/** 颜色配置 */
const types = [
    { name: '运行', color: '#288AFF' },
    { name: '故障', color: '#FC9C91' },
    { name: '计划停机', color: '#FFDC94' },
    { name: '空白', color: '#F2F4F9' },
];


export default class GanttGraph {
    // tooltip - 基本是固定的
    tooltip = {
        trigger: 'item',
        axisPointer: {
            type: 'none',
        },
        formatter: (params) => {
            return `
                <div style="display: flex; align-items: center; justify-content: space-between">
                <h1 style="font-size: 18px; font-weight: 600;">${params.seriesName}</h1>
                <h2 style="font-size: 18px; font-weight: 400; letter-spacing: 1px;">${params.name} <span style="display: inline-block; margin-left: 8px; width: 12px; height: 12px; border-radius: 50%; background: ${params.color} "></span></h2>
                </div>
                <div>${new Date(params.value[1]).toLocaleString()} ~ ${new Date(params.value[2]).toLocaleString()}</div>
                `
        }
    }
    grid = []
    xAxis = []
    yAxis = []
    series = []

    constructor(el, startTime) {
        this.el = el;
        this.gridIndex = -1;
        this.currentGraphIndex = -2;
        this.startTime = new Date(startTime);
        // this.startTime = new Date(new Date('2023/10/8').toLocaleDateString());
        console.log('<> Gantt Created', this.startTime);

        // this.grid.push(this.makeGrid())
        // this.xAxis.push(...this.makeXaxis())
        // this.yAxis.push(...this.makeYaxis("设备1"))
        // this.series.push(...this.makeSeries({ equipmentName: "设备1" }))

        // this.grid.push(this.makeGrid())
        // this.xAxis.push(...this.makeXaxis())
        // this.yAxis.push(...this.makeYaxis("设备2"))
        // this.series.push(...this.makeSeries({ equipmentName: "设备2" }))

    }

    // 构造一个新的 grid
    makeGrid() {
        this.gridIndex++;
        return {
            id: 'GRID_' + this.gridIndex,
            // top: 12 + 128 * this.gridIndex,
            top: 12 + 104 * this.gridIndex,
            right: 48,
            left: 88,
            height: 56
        }
    }

    // 构造一个 xAxis
    makeXaxis() {
        const [id1, id2] = ['' + Math.random(), '' + Math.random()]
        return [
            {
                id: id1,
                gridIndex: this.gridIndex,
                axisTick: {
                    alignWithLabel: true,
                    inside: true,
                },
                type: 'time',
                min: getTodayStart(this.startTime),
                max: getStartTime(this.startTime.getTime() + 3600 * 24 * 1000),
                splitNumber: 10,
                axisLabel: {
                    margin: 12,
                    formatter: function (val) {
                        return new Date(val)
                            .toLocaleTimeString()
                            .split(':')
                            .slice(0, 2)
                            .join(':');
                    },
                },
                boundaryGap: false,
                // data: getXaxisRange(getTodayStart(new Date())),
            },
            {
                id: id2,
                gridIndex: this.gridIndex,
                axisLabel: { show: false },
                axisLine: { show: false },
            },
        ]
    }


    // 构造一个 yAxis
    makeYaxis(equipmentName) {
        const [id1, id2] = ['' + Math.random(), '' + Math.random()]
        return [
            // 主y轴
            {
                id: id1,
                gridIndex: this.gridIndex,
                type: 'value',
                splitLine: { show: false },
                name: equipmentName,
                nameLocation: 'center',
                nameGap: 14,
                nameRotate: 0,
                nameTextStyle: {
                    fontSize: 16,
                },
                axisLine: {
                    show: true,
                    lineStyle: {},
                },
                axisLabel: { show: false },
                axisTick: { show: false },
            },
            // 辅y轴
            {
                id: id2,
                gridIndex: this.gridIndex,
                type: 'value',
                splitLine: { show: false },
                axisLabel: { show: false },
                axisTick: { show: false },
            },
        ]
    }

    // 构造一个 series
    makeSeries({ equipmentName, arr }) {
        this.currentGraphIndex += 2;
        const bgStartTime = this.startTime.getTime();
        const bgEndTime = bgStartTime + 3600 * 24 * 1000;
        return [
            // 沉默的背景
            {
                xAxisIndex: this.currentGraphIndex,
                yAxisIndex: this.currentGraphIndex,
                type: 'custom',
                renderItem: renderItem,
                silent: true,
                itemStyle: {
                    opacity: 0.8,
                },
                encode: {
                    x: [1, 2],
                    y: 0,
                },
                data: [
                    {
                        name: '无数据',
                        value: [0, bgStartTime, bgEndTime, 0],
                        tooltip: { show: false },
                        itemStyle: {
                            color: '#ccc',
                            opacity: 0.3,
                        }
                    },
                ]
            },
            {
                name: equipmentName,
                xAxisIndex: this.currentGraphIndex,
                yAxisIndex: this.currentGraphIndex,
                type: 'custom',
                renderItem: renderItem,
                itemStyle: {
                    opacity: 0.8,
                },
                encode: {
                    x: [1, 2],
                    y: 0,
                },
                data: arr.map(item => ({
                    name: ['运行', '故障', '计划停机'][item.status],
                    value: [0, item.startTime, item.startTime + item.duration * 60 * 1000, 0],
                    itemStyle: {
                        color: types[item.status].color,
                    }
                })),
            },
        ]
    }

    init(data) {
        if (!this.el) throw new Error('没有可供echarts初始化的容器')
        if (typeof this.el == 'string') {
            this.el = document.querySelector(this.el);
        }
        this.chart = echarts.init(this.el);
        this.handleProps(data);

        setTimeout(() => {
            // debugger;
            this.chart.setOption(this.option);
        }, 200);
    }

    update(data) {
        this.clear();
        this.init(data);
    }

    resize() {
        this.chart.resize();
    }

    get option() {
        return {
            tooltip: this.tooltip,
            grid: this.grid,
            xAxis: this.xAxis,
            yAxis: this.yAxis,
            series: this.series,
        }
    }

    // 每次 graphList 刷新都会重新渲染整个所有图表
    // 可以改进的地方：添加一个 handleAdd() 方法，一次添加一个新的
    handleProps(props) {
        // props 是父组件的 graphList
        console.log('props: ', props);
        props.forEach(eqArr => {
            this.grid.push(this.makeGrid());
            this.xAxis.push(...this.makeXaxis());
            this.yAxis.push(...this.makeYaxis(eqArr.key));
            this.series.push(...this.makeSeries({ equipmentName: eqArr.key, arr: eqArr }))
        });
    }

    // handleAdd
    handleAdd() { }

    clear() {
        this.grid = [];
        this.xAxis = [];
        this.yAxis = [];
        this.series = [];
        this.currentGraphIndex = -2;
        this.gridIndex = -1;
        this.chart.dispose();
    }

    // print option
    print() {
        console.log(JSON.stringify(this.option, null, 2));
    }

}