import { ServerQueryOperators, SQlComparisons } from "../types";
/**
 * Quote a single identifier (table, column, alias) with backticks.
 * Already-quoted identifiers (e.g. "`users`") are returned unchanged.
 */
export function quoteIdentifier(identifier) {
    const str = String(identifier);
    if (/^`(?:[^`]|``)+`$/.test(str))
        return str;
    return `\`${str.replace(/`/g, "``")}\``;
}
/**
 * Quote a possibly qualified identifier: "table.field" -> `table`.`field`.
 * A bare "*" (or "table.*") is kept as a wildcard.
 */
export function quoteQualified(identifier) {
    const str = String(identifier);
    if (/^`(?:[^`]|``)+`$/.test(str))
        return str;
    return str
        .split(".")
        .map((part) => (part === "*" ? "*" : quoteIdentifier(part)))
        .join(".");
}
/**
 * Build a column reference, prefixing the table when one is given and the
 * field is not already qualified.
 */
export function columnRef(field, table) {
    const fieldStr = String(field);
    if (!table || fieldStr.includes("."))
        return quoteQualified(fieldStr);
    return `${quoteQualified(table)}.${fieldStr === "*" ? "*" : quoteIdentifier(fieldStr)}`;
}
/**
 * Escape a value for use inside a single-quoted SQL string literal.
 */
export function escapeStringLiteral(value) {
    return String(value).replace(/\\/g, "\\\\").replace(/'/g, "''");
}
export function sqlLogicalOperator(operator) {
    if (!operator)
        return "AND";
    const upper = String(operator).toUpperCase();
    if (ServerQueryOperators.includes(upper)) {
        return upper;
    }
    throw new Error(`Invalid logical operator: ${operator}`);
}
export function sqlOrderStrategy(strategy) {
    if (!strategy)
        return "ASC";
    const upper = String(strategy).toUpperCase();
    if (upper === "ASC" || upper === "DESC")
        return upper;
    throw new Error(`Invalid order strategy: ${strategy}`);
}
export function sqlRawComparison(comparison) {
    const upper = String(comparison).toUpperCase();
    if (SQlComparisons.includes(upper))
        return upper;
    throw new Error(`Invalid comparison operator: ${comparison}`);
}
const JoinTypes = ["INNER JOIN", "JOIN", "LEFT JOIN", "RIGHT JOIN"];
export function sqlJoinType(joinType) {
    const upper = String(joinType).toUpperCase();
    if (JoinTypes.includes(upper))
        return upper;
    throw new Error(`Invalid join type: ${joinType}`);
}
/**
 * Validate a LIMIT / OFFSET / page value as a non-negative integer.
 */
export function sqlNonNegativeInt(value, name) {
    const num = typeof value == "string" && value.trim() !== "" ? Number(value) : value;
    if (typeof num != "number" || !Number.isInteger(num) || num < 0) {
        throw new Error(`Invalid ${name}: ${String(value)}`);
    }
    return num;
}