interface SparklineProps {
  data: number[]
  width?: number
  height?: number
  color?: string
  filled?: boolean
}

export function Sparkline({ data, width = 120, height = 28, color = "currentColor", filled = false }: SparklineProps) {
  const valid = data.filter((v) => v != null && isFinite(v))
  if (valid.length < 2) return <span className="text-muted-foreground/50 text-xs font-mono">—</span>

  const max = Math.max(...valid)
  const min = Math.min(...valid)
  const span = Math.max(1, max - min)

  const pts = data.map((v, i) => [
    (i / (data.length - 1)) * width,
    height - ((v - min) / span) * (height - 2) - 1,
  ])

  const lineD = pts.map(([x, y], i) => `${i === 0 ? "M" : "L"}${x.toFixed(1)},${y.toFixed(1)}`).join(" ")
  const areaD = `${lineD} L${width},${height} L0,${height} Z`

  return (
    <svg width={width} height={height} viewBox={`0 0 ${width} ${height}`} style={{ display: "block" }}>
      {filled && <path d={areaD} style={{ fill: color, fillOpacity: 0.15 }} />}
      <path d={lineD} fill="none" style={{ stroke: color }} strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" />
    </svg>
  )
}
