const dateFormatOptions = { year: 'numeric', month: '2-digit', day: '2-digit' };
const dateFormat = new Intl.DateTimeFormat('de-DE', dateFormatOptions);

const dateTimeFormatOptions = { year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: 'numeric', second: 'numeric' };
const dateTimeFormat = new Intl.DateTimeFormat('de-DE', dateTimeFormatOptions);

const formatTimeElements = () => {
    Array.from(document.getElementsByTagName('time')).forEach((timeTag) => {
        let date = Date.parse(timeTag.getAttribute('datetime'));
        if (! isNaN(date)) {
            timeTag.innerText = dateTimeFormat.format(date);
        }
    });
};

window.addEventListener('load', formatTimeElements);
window.addEventListener('htmx:afterRequest', formatTimeElements);

function drawPieChart(url, elemId, title, data) {
    if (data) {
        update(elemId, data);
    } else {
        fetch(url)
            .then(resp => resp.json())
            .then(d => {
                draw(elemId, title, d);
                update(elemId, d);
            });
    }

    function update(elemId, data) {
        let chartDom = document.getElementById(elemId);
        let chart = echarts.init(chartDom);

        let option = {
            color: data.map(i => i.color),
            animationDuration: 250,
            animationDurationUpdate: 250,
            series: [
                {
                    type: 'pie',
                    radius: ['40%', '70%'],
                    avoidLabelOverlap: false,
                    label: {
                        show: false,
                        position: 'center'
                    },
                    labelLine: {
                        show: false
                    },
                    data: data
                }
            ]
        };

        option && chart.setOption(option);
    }

    function draw(elemId, title, data) {
        let chartDom = document.getElementById(elemId);
        let chart = echarts.init(chartDom);
        let option= {
            title: {
                text: title,
                left: 'center'
            },
            tooltip: {
                trigger: 'item'
            },
            color: data.map(i => i.color),
            animationDuration: 250,
            animationDurationUpdate: 250
        };

        option && chart.setOption(option);
    }
}

function drawBarChart(url, elemId, title, data) {
    if (data) {
        update(elemId, data);
    } else {
        fetch(url)
            .then(resp => resp.json())
            .then(data => {
                draw(elemId, title, data);
                update(elemId, data);
            });
    }

    function update(elemId, data) {
        let chartDom = document.getElementById(elemId);
        let chart = echarts.init(chartDom);

        let option = {
            series: [
                {
                    name: 'UNKNOWN',
                    type: 'bar',
                    stack: 'total',
                    data: data.map(i => i.nameValues.unknown)
                },
                {
                    name: 'ERROR',
                    type: 'bar',
                    stack: 'total',
                    data: data.map(i => i.nameValues.error)
                },
                {
                    name: 'WARNING',
                    type: 'bar',
                    stack: 'total',
                    data: data.map(i => i.nameValues.warning)
                },
                {
                    name: 'SUCCESS',
                    type: 'bar',
                    stack: 'total',
                    data: data.map(i => i.nameValues.success)
                },
                {
                    name: 'DUPLICATION',
                    type: 'bar',
                    stack: 'total',
                    data: data.map(i => i.nameValues.duplication)
                }
            ]
        };

        option && chart.setOption(option);
    }

    function draw(elemId, title, data) {
        let chartDom = document.getElementById(elemId);
        let chart = echarts.init(chartDom);
        let option= {
            title: {
                text: title,
                left: 'center'
            },
            xAxis: {
                type: 'category',
                data: data.map(i => dateFormat.format(Date.parse(i.date)))
            },
            yAxis: {
                type: 'value',
                minInterval: 1
            },
            tooltip: {
                trigger: 'item'
            },
            color: ['slategray', 'red', 'darkorange', 'green', 'slategray'],
            animationDuration: 250,
            animationDurationUpdate: 250
        };

        option && chart.setOption(option);
    }
}