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import clsx from "clsx";
import { SEVERITY_COLORS, formatPercentage } from "../../constants";
import type { Severity } from "../../types";
import styles from "./MemoryGauge.module.scss";
export interface MemoryGaugeProps {
/** Usage percentage (0-100) */
usagePercentage: number | null;
/** Current severity level */
severity: Severity;
/** Formatted heap used string */
heapUsed?: string;
/** Formatted heap limit string */
heapLimit?: string;
/** Warning threshold */
warningThreshold?: number;
/** Critical threshold */
criticalThreshold?: number;
/** Custom class name */
className?: string;
}
/**
* Custom SVG arc path generator
*/
function describeArc(
cx: number,
cy: number,
radius: number,
startAngle: number,
endAngle: number
): string {
const start = polarToCartesian(cx, cy, radius, endAngle);
const end = polarToCartesian(cx, cy, radius, startAngle);
const largeArcFlag = endAngle - startAngle <= 180 ? "0" : "1";
return [
"M", start.x, start.y,
"A", radius, radius, 0, largeArcFlag, 0, end.x, end.y,
].join(" ");
}
function polarToCartesian(
cx: number,
cy: number,
radius: number,
angleInDegrees: number
) {
const angleInRadians = ((angleInDegrees - 180) * Math.PI) / 180;
return {
x: cx + radius * Math.cos(angleInRadians),
y: cy + radius * Math.sin(angleInRadians),
};
}
/**
* Radial gauge chart showing memory usage percentage
* Uses custom SVG for precise control over appearance
*/
export function MemoryGauge({
usagePercentage,
severity,
heapUsed,
heapLimit,
warningThreshold = 70,
criticalThreshold = 90,
className,
}: MemoryGaugeProps) {
const percentage = usagePercentage ?? 0;
const color = SEVERITY_COLORS[severity].accent;
// SVG dimensions
const width = 280;
const height = 160;
const cx = width / 2;
const cy = height - 20;
const radius = 100;
const strokeWidth = 24;
// Arc angles (180° arc from left to right)
const startAngle = 0;
const endAngle = 180;
const progressAngle = (percentage / 100) * 180;
// Generate arc paths
const backgroundArc = useMemo(
() => describeArc(cx, cy, radius, startAngle, endAngle),
[cx, cy, radius]
);
const progressArc = useMemo(
() =>
percentage > 0
? describeArc(cx, cy, radius, startAngle, Math.min(progressAngle, 180))
: "",
[cx, cy, radius, percentage, progressAngle]
);
return (
<div className={clsx(styles.container, className)}>
{/* SVG Gauge */}
<div className={styles.svgWrapper}>
<svg
width={width}
height={height}
viewBox={`0 0 ${width} ${height}`}
className={styles.svg}
>
{/* Background arc */}
<path
d={backgroundArc}
fill="none"
stroke="currentColor"
strokeWidth={strokeWidth}
strokeLinecap="round"
className={styles.backgroundArc}
/>
{/* Progress arc */}
{percentage > 0 && (
<path
d={progressArc}
fill="none"
stroke={color}
strokeWidth={strokeWidth}
strokeLinecap="round"
style={{
transition: "stroke-dashoffset 0.5s ease-out",
}}
/>
)}
</svg>
{/* Center content - positioned over the SVG */}
<div className={styles.centerContent}>
<div
className={clsx(
styles.percentageValue,
severity === "critical" && styles.critical,
severity === "warning" && styles.warning
)}
>
{formatPercentage(usagePercentage)}
</div>
{heapUsed && heapLimit && (
<div className={styles.heapInfo}>
{heapUsed} / {heapLimit}
</div>
)}
</div>
</div>
{/* Threshold markers */}
<div
className={styles.thresholdMarkers}
style={{ width: width - 20 }}
>
<span>0%</span>
<span className={styles.warningMarker}>{warningThreshold}%</span>
<span className={styles.criticalMarker}>{criticalThreshold}%</span>
<span>100%</span>
</div>
</div>
);
}
MemoryGauge.displayName = "MemoryGauge";
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