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import {
LineChart as ReLineChart,
XAxis,
YAxis,
CartesianGrid,
Line,
DotProps,
Layer,
} from 'recharts';
// Components
import CustomTooltip from './CustomTooltip';
import CustomXAxisTick from './CustomXAxisTick';
import CustomYAxisTick from './CustomYAxisTick';
// Constants
import { CHART_COLORS } from '@/constants/chart';
// Utils
import { isTruthy } from '@/utils/validation';
// Types
import { ChartKey, LineChartRow, Metric } from '@/types/chart';
type OnMouseMove = NonNullable<
React.ComponentProps<typeof ReLineChart>['onMouseMove']
>;
interface LineChartProps {
data: LineChartRow[];
metrics: Metric[];
spacing: number;
roundedMax: number;
ticks: number[];
colors: string[];
colorsByKey?: Record<string, string>;
width?: number;
height?: number;
barSize?: number;
activeIndex?: number | null;
modeKey?: ChartKey;
containerRef?: React.RefObject<HTMLDivElement | null>;
onActiveIndexChange?: (i: number | null) => void;
}
const LineChart = ({
data,
metrics,
spacing,
roundedMax,
ticks,
colors,
colorsByKey,
width = 300,
height = 200,
barSize = 16,
activeIndex = null,
modeKey = ChartKey.SLOT,
containerRef,
onActiveIndexChange,
}: LineChartProps) => {
const dotRef = useRef<Record<number, { cx: number; cy: number }>>({});
const [overlayX, setOverlayX] = useState<number | null>(null);
const [hoverIndex, setHoverIndex] = useState<number | null>(null);
const setActiveIndex = useCallback(
(next: number | null) => {
if (next !== activeIndex) {
onActiveIndexChange?.(next);
}
},
[activeIndex],
);
const handleMouseMove: OnMouseMove = useCallback(
(state) => {
if (state?.isTooltipActive && isTruthy(state.activeTooltipIndex)) {
const idx = Number(state.activeTooltipIndex);
const x = state.activeCoordinate?.x ?? 0;
setOverlayX((prev) => (prev !== x ? x : prev));
setHoverIndex((prev) => (prev !== idx ? idx : prev));
} else {
if (isTruthy(overlayX || hoverIndex)) {
setOverlayX(null);
setHoverIndex(null);
setActiveIndex?.(null);
}
}
},
[overlayX, hoverIndex, setActiveIndex],
);
const handleMouseLeave = useCallback(() => {
setActiveIndex?.(null);
}, [setActiveIndex]);
const handleMouseEnter = useCallback(() => {
setActiveIndex?.(hoverIndex);
}, [hoverIndex, setActiveIndex]);
const hasDataRow = useMemo(
() =>
isTruthy(hoverIndex) &&
data[hoverIndex] &&
Object.entries(data[hoverIndex]).some(([key, value]) => {
return !isNaN(Number(key)) && typeof value === 'number' && value > 0;
}),
[hoverIndex, data],
);
const widthYAxis = useMemo(() => {
const dynamicWidth = Math.max(...ticks).toString().length * 10;
return Math.max(dynamicWidth, 30); // 30 is min width
}, [ticks]);
return (
<ReLineChart
data={data}
width={width}
height={height}
margin={{ top: 16, right: 0, left: 0, bottom: 0 }}
onMouseMove={handleMouseMove}
onMouseLeave={handleMouseLeave}
>
<CartesianGrid strokeDasharray="3 3" vertical={false} />
<XAxis
dataKey="label"
tickLine={false}
axisLine={false}
interval={0}
scale="point"
padding={{ left: spacing, right: spacing }}
tick={(props) => (
<CustomXAxisTick {...props} activeIndex={activeIndex} data={data} />
)}
/>
<YAxis
axisLine={false}
tickLine={false}
width={widthYAxis}
domain={[0, roundedMax]}
ticks={ticks}
tick={CustomYAxisTick}
/>
<CustomTooltip
modeKey={modeKey}
colorsByKey={colorsByKey}
activeIndex={activeIndex}
containerRef={containerRef}
dotRef={dotRef}
/>
{metrics.map((m, idx) => {
const color = colors[idx] ?? CHART_COLORS.PRIMARY;
return (
<Line
key={m.key}
type="linear"
dataKey={m.key}
name={m.label ?? m.key}
stroke={color}
dot={{ r: 3, fill: color }}
strokeWidth={1.5}
activeDot={(p) => {
const { index, dataKey, cx, cy } = p;
const row = data[index];
if (row) {
// Find the metric key with the maximum value in the current row
const maxKey = metrics.reduce((prev, curr) => {
const prevVal = row[prev.key] ?? -Infinity;
const currVal = row[curr.key] ?? -Infinity;
return currVal > prevVal ? curr : prev;
});
// If the current dot matches the maximum metric → store its position in ref
if (dataKey === maxKey.key) {
dotRef.current[index] = { cx: cx!, cy: cy! };
}
}
return (
<circle
cx={cx}
cy={cy}
r={activeIndex === index ? 4 : 3}
fill={color}
stroke={color}
/>
);
}}
isAnimationActive={false}
connectNulls={false}
/>
);
})}
<Layer>
{isTruthy(overlayX) && hasDataRow && (
<rect
x={overlayX - barSize / 2}
y={0}
width={barSize}
height={height}
fill="none"
pointerEvents="all"
className="cursor-pointer"
onMouseEnter={handleMouseEnter}
onMouseLeave={handleMouseLeave}
/>
)}
</Layer>
</ReLineChart>
);
};
export default LineChart;
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