import { z } from "zod";
/**
 * Coerce a value that might be a JSON string into a string array.
 * LLMs sometimes pass arrays as stringified JSON (e.g. '["a","b"]' instead of ["a","b"]).
 */
export function coerceStringArray() {
    return z.preprocess((val) => {
        if (typeof val === "string") {
            try {
                const parsed = JSON.parse(val);
                if (Array.isArray(parsed))
                    return parsed;
            }
            catch {
                // not JSON, return as-is for zod to validate
            }
        }
        return val;
    }, z.array(z.string()));
}
/**
 * Coerce a value that might be a numeric string into a number.
 * LLMs sometimes pass numbers as strings (e.g. "30" instead of 30).
 */
export function coerceNumber() {
    return z.preprocess((val) => {
        if (typeof val === "string") {
            const n = Number(val);
            if (!isNaN(n))
                return n;
        }
        return val;
    }, z.number());
}
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