const ids: Set<string> = new Set()
const characters =
    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

/**
 * Creates a unique id with letters, numbers, but no spaces or special characters. By default, the length is 6 characters. Works in the browser and NodeJS (and other runtimes). Handy, but not cryptographically secure.
 *
 *
 * @example
 * Basic usage
 * ```js
 * // Generate a default length id
 * const id = getId();
 * console.log(id); // e.g., 'a1B2c3'
 * ```
 *
 * @example
 * Custom length id
 * ```js
 * const id = getId(10);
 * console.log(id); // e.g., 'a1B2c3D4e5'
 * ```
 *
 * @param length - The length of the generated id. Default is 6.
 */

export default function getId(length: number = 6): string {
    let i = 0
    let id = ""
    do {
        id = createId(length)
        i++
        if (i > 3) {
            console.warn(`getId.ts attempt ${i}! Increase the length.`)
        }
    } while (ids.has(id))
    ids.add(id)
    return id
}

function createId(length: number) {
    return Array.from(
        { length },
        () => characters[Math.floor(Math.random() * characters.length)]
    ).join("")
}