umami/components/metrics/EventsChart.js

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import React, { useMemo } from 'react';
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import tinycolor from 'tinycolor2';
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import BarChart from './BarChart';
import { getDateArray, getDateLength } from 'lib/date';
import useFetch from 'hooks/useFetch';
import useDateRange from 'hooks/useDateRange';
import useTimezone from 'hooks/useTimezone';
import { EVENT_COLORS } from 'lib/constants';
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export default function EventsChart({ websiteId, token }) {
const [dateRange] = useDateRange(websiteId);
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const { startDate, endDate, unit, modified } = dateRange;
const [timezone] = useTimezone();
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const { data } = useFetch(
`/api/website/${websiteId}/events`,
{
start_at: +startDate,
end_at: +endDate,
unit,
tz: timezone,
token,
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},
{ update: [modified] },
);
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const datasets = useMemo(() => {
if (!data) return [];
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const map = data.reduce((obj, { x, t, y }) => {
if (!obj[x]) {
obj[x] = [];
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}
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obj[x].push({ t, y });
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return obj;
}, {});
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Object.keys(map).forEach(key => {
map[key] = getDateArray(map[key], startDate, endDate, unit);
});
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return Object.keys(map).map((key, index) => {
const color = tinycolor(EVENT_COLORS[index]);
return {
label: key,
data: map[key],
lineTension: 0,
backgroundColor: color.setAlpha(0.6).toRgbString(),
borderColor: color.setAlpha(0.7).toRgbString(),
borderWidth: 1,
};
});
}, [data]);
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function handleCreate(options) {
const legend = {
position: 'bottom',
};
options.legend = legend;
}
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function handleUpdate(chart) {
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chart.data.datasets = datasets;
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chart.update();
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}
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if (!data) {
return null;
}
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return (
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<BarChart
chartId={`events-${websiteId}`}
datasets={datasets}
unit={unit}
records={getDateLength(startDate, endDate, unit)}
onCreate={handleCreate}
onUpdate={handleUpdate}
stacked
/>
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);
}