import type {
  CountdownConfig,
  CountdownLabels,
  CountdownUnit,
} from "./Countdown.static";
import { countdownUnits } from "./Countdown.static";

const defaultCountdownLabels: Required<CountdownLabels> = {
  days: {
    many: "dni",
    few: "dni",
    one: "deň",
  },
  hours: "hod",
  minutes: "min",
  seconds: "sek",
};

const defaultCountdownTagLabels: Required<CountdownLabels> = {
  days: "d",
  hours: "h",
  minutes: "m",
  seconds: "s",
};

const normalizeUnits = (units?: CountdownUnit[]): CountdownUnit[] => {
  if (!units?.length) {
    return [...countdownUnits];
  }

  return countdownUnits.filter((unit) => units.includes(unit));
};

const getLabelText = (
  unit: CountdownUnit,
  labels: CountdownLabels | undefined,
  fallback: Required<CountdownLabels>,
): string => {
  if (unit === "days") {
    const value = labels?.days ?? fallback.days;
    return typeof value === "string" ? value : value.many;
  }

  return labels?.[unit] ?? fallback[unit];
};

const buildCountdownConfig = (
  targetDate: string,
  units: CountdownUnit[],
  labels?: CountdownLabels,
): CountdownConfig => ({
  labels,
  targetDate,
  units: normalizeUnits(units),
});

const getAriaLive = (units: CountdownUnit[]): "off" | "polite" =>
  units.includes("seconds") ? "off" : "polite";

export {
  buildCountdownConfig,
  defaultCountdownLabels,
  defaultCountdownTagLabels,
  getAriaLive,
  getLabelText,
  normalizeUnits,
};