import { CountdownInfo } from "./types";

/**
 * Determine the countdown label, color and urgency for a target time.
 *
 * Thresholds (minutes until target):
 * - 0   → red, "Now"
 * - ≤10 → orange (urgent)
 * - ≤30 → yellow
 * - ≤60 → green
 * - >60 → blue ("Xh Ymin")
 */
export function calculateCountdown(targetDate: Date): CountdownInfo {
  const now = new Date();
  const diffMs = targetDate.getTime() - now.getTime();
  const diffMin = Math.floor(diffMs / 60000);

  if (diffMin <= 0) {
    return {
      label: "Now",
      color: "red",
      urgent: true,
    };
  }

  if (diffMin <= 10) {
    return {
      label: `${diffMin}min`,
      color: "orange",
      urgent: true,
    };
  }

  if (diffMin <= 30) {
    return {
      label: `${diffMin}min`,
      color: "yellow",
      urgent: false,
    };
  }

  if (diffMin <= 60) {
    return {
      label: `${diffMin}min`,
      color: "green",
      urgent: false,
    };
  }

  const hours = Math.floor(diffMin / 60);
  const remainingMin = diffMin % 60;
  return {
    label: `${hours}h ${remainingMin}min`,
    color: "blue",
    urgent: false,
  };
}