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export function cycleNext(current: number, max: number) {
if (current + 1 === max) return 0;
else return current + 1;
}
export function cyclePrev(current: number, max: number) {
if (current === 0) return max;
else return current - 1;
}
export function randomFromArray<T>(a: Array<T>): T {
const l = a.length;
if (l === 0) throw new Error("Empty array!");
const randomIdx = Math.floor(Math.random() * l);
const idx = randomIdx === l ? randomIdx - 1 : randomIdx;
const el = a[idx]!;
return el;
}
export function randomFromArrayMany<T>(
a: Array<T>,
count: number,
canRepeat = false,
): Array<T> {
if (canRepeat) return [...new Array(count)].map((s) => randomFromArray(a));
else return randomFromArrayNoRepeat(a, count);
}
export function randomFromArrayNoRepeat<T>(
a: Array<T>,
count: number,
acc?: Set<T>,
): T[] {
const all = new Set(a);
const st = acc ? acc : new Set<T>();
if (all.size === st.size || st.size === count) return [...st];
const el = randomFromArray(a);
if (!st.has(el)) st.add(el);
return randomFromArrayNoRepeat(a, count, st);
}
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`;
}
}
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