/* ============================================================================
   Card.Stat - Figma 25:792 (260 x 166)
   ----------------------------------------------------------------------------
   The figure card used by the home page stats strip: a large accent number,
   an optional trend chip, the label it counts, a rule and a caption. Never a
   link - a number is not a destination.

   USAGE
   -----
   <ul className="grid gap-lg sm:grid-cols-2 lg:grid-cols-4">
     <Card.Stat
       as="li"
       value="2,450"
       label="Participants reached"
       caption="Cumulative regional outreach, updated each quarter."
       trend={{ label: "12%", direction: "up", description: "up 12% on last quarter" }}
     />
     <Card.Stat as="li" value="18" label="Municipalities engaged" />
   </ul>

   // Arabic - Eastern Arabic numerals belong in the value string itself.
   <Card.Stat value="٢٬٤٥٠" label="عدد المشاركين" />
   ========================================================================= */

import { CardIcon, CardShell, cx } from "./CardShell";
import type { CardElement } from "./types";

export interface CardStatTrend {
  /** Visible text, e.g. "12%". */
  label: string;
  /** Up is the accent fill, down the danger fill. Defaults to up. */
  direction?: "up" | "down";
  /**
   * Spoken instead of the bare figure, e.g. "up 12% on last quarter". The
   * arrow is decorative, so without this a screen reader hears only "12%".
   */
  description?: string;
}

export interface CardStatProps {
  /** Pre-formatted for the locale - the card never formats a number itself. */
  value: string;
  label: string;
  caption?: string;
  trend?: CardStatTrend;
  as?: CardElement;
  className?: string;
}

export function CardStat({
  value,
  label,
  caption,
  trend,
  as = "article",
  className,
}: CardStatProps) {
  const isDown = trend?.direction === "down";

  return (
    <CardShell
      as={as}
      className={cx("flex-col items-start gap-md p-lg", className)}
    >
      <div className="flex w-full items-center justify-between gap-sm">
        <p className="display-sm tabular-nums text-text-accent">{value}</p>

        {trend ? (
          /* Figma paints the chip label in text/accent on a background/accent
             fill - green on green, invisible. Kept as the accent fill with the
             always-white on-accent label, and the danger fill when the figure
             is falling. */
          <span
            className={cx(
              "inline-flex shrink-0 items-center gap-2xs rounded-chip px-xs py-2xs",
              "label-md text-text-on-accent",
              isDown ? "bg-surface-danger" : "bg-surface-accent",
            )}
          >
            <CardIcon
              name="arrow-up"
              size={10}
              className={isDown ? "rotate-180" : undefined}
            />
            {trend.description ? (
              <>
                <span aria-hidden="true">{trend.label}</span>
                <span className="sr-only">{trend.description}</span>
              </>
            ) : (
              trend.label
            )}
          </span>
        ) : null}
      </div>

      <p className="body-md-bold text-text-primary">{label}</p>

      <div aria-hidden="true" className="w-full border-t border-border-subtle" />

      {caption ? (
        <p className="body-sm text-text-secondary">{caption}</p>
      ) : null}
    </CardShell>
  );
}