export function randomFromArray<T>(a: Array<T>): T {
  const l = a.length;
  const ind = Math.floor(Math.random() * l);
  if (ind === l) return a[ind - 1];
  else return a[ind];
}
export function randomFromArrayAcc<T>(a: Array<T>, s?: Set<T>): T {
  const st = s ? s : new Set(a);
  const l = a.length;
  const ind = Math.floor(Math.random() * l);
  const res = ind === l ? a[ind - 1] : a[ind];
  if (st.has(res)) return randomFromArrayAcc(a, st);
  else {
    st.add(res);
    // TODO have to return this too?
    return res;
  }
}
export function notRandomFromArray<T>(data: string, a: Array<T>): T {
  const l = a.length;
  const ind = hashTextToNumber(data, l - 1);
  return a[ind];
}

function hashTextToNumber(text: string, max: number): number {
  let hash = 0;
  for (let i = 0; i < text.length; i++) {
    const char = text.charCodeAt(i);
    hash = (hash << 5) - hash + char;
    hash = hash & hash; // Convert to 32-bit integer
  }
  // Make sure the hash is positive and within the given range
  return Math.abs(hash) % max;
}

// Format time for display (HH:MM:SS)
export const formatTime = (seconds: number): string => {
  const hrs = Math.floor(seconds / 3600);
  const mins = Math.floor((seconds % 3600) / 60);
  const secs = Math.floor(seconds % 60);

  return `${hrs.toString().padStart(2, "0")}:${mins
    .toString()
    .padStart(2, "0")}:${secs.toString().padStart(2, "0")}`;
};

export function date_diff(date: number, type: "short" | "long") {
  const now = new Date().getTime();
  const diff = now - new Date(date).getTime();
  if (type == "short") {
    return to_string(diff / 1000);
  } else {
    return to_string_long(diff / 1000);
  }
}

function to_string(s: number) {
  if (s < 60) {
    return "now";
  } else if (s < 3600) {
    return `${Math.ceil(s / 60)}m`;
  } else if (s < 86400) {
    return `${Math.ceil(s / 60 / 60)}h`;
  } else if (s < 2678400) {
    return `${Math.ceil(s / 60 / 60 / 24)}d`;
  } else if (s < 32140800) {
    return `${Math.ceil(s / 60 / 60 / 24 / 30)}mo`;
  } else {
    return `${Math.ceil(s / 60 / 60 / 24 / 30 / 12)}y`;
  }
}

function to_string_long(s: number) {
  if (s < 60) {
    return "right now";
  } else if (s < 3600) {
    return `${Math.ceil(s / 60)} minutes ago`;
  } else if (s < 86400) {
    return `${Math.ceil(s / 60 / 60)} hours ago`;
  } else if (s < 2678400) {
    return `${Math.ceil(s / 60 / 60 / 24)} days ago`;
  } else if (s < 32140800) {
    return `${Math.ceil(s / 60 / 60 / 24 / 30)} months ago`;
  } else {
    return `${Math.ceil(s / 60 / 60 / 24 / 30 / 12)} years ago`;
  }
}