import {CE} from "js-vextensions";
import {slugid_v4} from "./KeyGenerator_LL.js";
//import {AddSchema} from "./SchemaHelpers.js";

export type UUID = string; // just an alias
export const UUID_regex_partial = "[A-Za-z0-9_-]{22}";
export const UUID_regex = `^${UUID_regex_partial}$`;
//AddSchema("UUID", {type: "string", pattern: UUID_regex}); // moved to "SchemaHelpers.ts" file, so this file can be imported standalone

// we display the first 2 chars of UUIDs in various places, so try to avoid unpleasant character-combos for it
const unpleasant2Chars = ["fu", "pp"];
//let unpleasant4Chars = [];

export const generatedUUIDHistory = [] as string[];
/** Helper, eg. for if creating a db-seed file, and you need to reference the ID of the previous entry within an array literal. */
export function LastUUID(indexAdjustment = 0) {
	return generatedUUIDHistory[(generatedUUIDHistory.length - 1) + indexAdjustment];
}

export function GenerateUUID(avoidUnpleasantStartChars = true): string {
	//return uuidV4(options);
	let result: string = slugid_v4();
	if (avoidUnpleasantStartChars) {
		while (CE(unpleasant2Chars).Contains(result.toLowerCase().slice(0, 2))) {
			result = slugid_v4();
		}
	}
	generatedUUIDHistory.push(result);
	return result;
}