import { sqlName, sqlStringLiteral } from "./sql-safe";

type Param = {
    /**
     * An already validated and quoted column reference
     */
    field: string;
    alias: string;
    separator?: string;
    distinct?: boolean;
};

export default function sqlGenGrabConcatStr({
    alias,
    field,
    separator = ",",
    distinct,
}: Param) {
    let gc = `GROUP_CONCAT(`;

    if (distinct) {
        gc += `DISTINCT `;
    }

    gc += field;

    if (!distinct) {
        gc += `, ${sqlStringLiteral(String(separator))}`;
    }

    gc += `)`;
    gc += ` AS ${sqlName(alias, "alias")}`;

    return gc;
}