import { Card, CardContent } from "@/components/ui/card";

type StatColor = "blue" | "green" | "violet" | "amber" | "emerald";

const gradientMap: Record<StatColor, string> = {
  blue: "from-blue-300 to-blue-500",
  green: "from-green-300 to-green-500",
  violet: "from-violet-300 to-violet-500",
  amber: "from-amber-300 to-amber-500",
  emerald: "from-emerald-300 to-emerald-500",
};

const accentLineMap: Record<StatColor, string> = {
  blue: "#3b82f6",
  green: "#22c55e",
  violet: "#8b5cf6",
  amber: "#f59e0b",
  emerald: "#10b981",
};

const strokeColorMap: Record<StatColor, [string, string]> = {
  blue: ["#93c5fd", "#3b82f6"],
  green: ["#86efac", "#22c55e"],
  violet: ["#c4b5fd", "#8b5cf6"],
  amber: ["#fcd34d", "#f59e0b"],
  emerald: ["#6ee7b7", "#10b981"],
};

interface StatCardProps {
  label: string;
  value: string | number;
  sub?: React.ReactNode;
  color?: StatColor;
  gauge?: number; // 0-100 percentage for ring gauge
}

function GaugeRing({ pct, color, size = 64, stroke = 4 }: { pct: number; color: StatColor; size?: number; stroke?: number }) {
  const radius = (size - stroke) / 2;
  const circumference = 2 * Math.PI * radius;
  const offset = circumference - (pct / 100) * circumference;
  const gradientId = `gauge-grad-${color}`;
  const [stopStart, stopEnd] = strokeColorMap[color] ?? ["#93c5fd", "#3b82f6"];

  return (
    <svg width={size} height={size} viewBox={`0 0 ${size} ${size}`} className="-rotate-90">
      <defs>
        <linearGradient id={gradientId}>
          <stop offset="0%" stopColor={stopStart} />
          <stop offset="100%" stopColor={stopEnd} />
        </linearGradient>
      </defs>
      <circle
        className="gauge-track"
        cx={size / 2}
        cy={size / 2}
        r={radius}
        strokeWidth={stroke}
      />
      <circle
        className="gauge-fill"
        cx={size / 2}
        cy={size / 2}
        r={radius}
        strokeWidth={stroke}
        stroke={`url(#${gradientId})`}
        strokeDasharray={circumference}
        strokeDashoffset={offset}
      />
    </svg>
  );
}

export function StatCard({ label, value, sub, color = "blue", gauge }: StatCardProps) {
  const hasGauge = gauge != null && gauge >= 0;
  const accent = accentLineMap[color];

  return (
    <Card className="card-hover-lift overflow-hidden relative group">
      {/* Top accent line */}
      <span
        className="absolute top-0 left-[20%] right-[20%] h-px"
        style={{
          background: `linear-gradient(90deg, transparent, ${accent}, transparent)`,
        }}
      />
      <CardContent className="pt-5 pb-4 px-4 relative flex flex-col items-center justify-center text-center min-h-[110px]">
        {hasGauge ? (
          <div className="relative flex items-center justify-center mb-1" style={{ width: 64, height: 64 }}>
            <GaugeRing pct={gauge} color={color} />
            <span
              className={`absolute inset-0 flex items-center justify-center text-xl font-bold bg-gradient-to-b ${gradientMap[color]} bg-clip-text text-transparent tabular-nums-transition`}
            >
              {value}
            </span>
          </div>
        ) : (
          <p
            className={`text-3xl font-bold bg-gradient-to-b ${gradientMap[color]} bg-clip-text text-transparent tabular-nums-transition mb-1`}
          >
            {value}
          </p>
        )}
        <p className="text-xs uppercase tracking-wider text-muted-foreground font-medium">
          {label}
        </p>
        {sub && <div className="mt-0.5 text-sm text-muted-foreground/70">{sub}</div>}
      </CardContent>
    </Card>
  );
}
