import sqlEqualityParser from "../../../utils/sql-equality-parser";
import { ServerQueryEqualities } from "../../../types";

type Params = {
    fieldName: string;
    value?: string;
    equality: (typeof ServerQueryEqualities)[number];
};

/**
 * # SQL Gen Operator Gen
 * @description Generates an SQL operator for node module `mysql` or `serverless-mysql`
 */
export default function sqlGenOperatorGen({
    fieldName,
    value,
    equality,
}: Params): string {
    if (value) {
        if (equality == "LIKE") {
            return `LOWER(${fieldName}) LIKE LOWER('%${value}%')`;
        } else if (equality == "LIKE_RAW") {
            return `LOWER(${fieldName}) LIKE LOWER('${value}')`;
        } else if (equality == "NOT LIKE") {
            return `LOWER(${fieldName}) NOT LIKE LOWER('%${value}%')`;
        } else if (equality == "NOT LIKE_RAW") {
            return `LOWER(${fieldName}) NOT LIKE LOWER('${value}')`;
        } else if (equality == "REGEXP") {
            return `LOWER(${fieldName}) REGEXP LOWER('${value}')`;
        } else if (equality == "FULLTEXT") {
            return `MATCH(${fieldName}) AGAINST('${value}' IN BOOLEAN MODE)`;
        } else if (equality == "NOT EQUAL") {
            return `${fieldName} != ${value}`;
        } else if (equality) {
            return `${fieldName} ${sqlEqualityParser(equality)} ${value}`;
        } else {
            return `${fieldName} = ${value}`;
        }
    } else {
        if (equality == "IS NULL") {
            return `${fieldName} IS NULL`;
        } else if (equality == "IS NOT NULL") {
            return `${fieldName} IS NOT NULL`;
        } else if (equality) {
            return `${fieldName} ${sqlEqualityParser(equality)} ?`;
        } else {
            return `${fieldName} = ?`;
        }
    }
}