// lib/forms/readFormXml.js
import fs from "fs";
import path from "path";

const xmlCache = new Map();

/**
 * Reads /data/formsxml/{appealtypes}.xml and normalises it.
 * Returns { xmlStr } or throws on missing file.
 */
export function readFormXml(appealtypes) {
    if (!appealtypes) throw new Error("readFormXml: appealtypes is required");

    const configDirectory = path.resolve(process.cwd(), "data/formsxml");
    const filePath = path.join(configDirectory, `${appealtypes}.xml`);

    const cacheKey = filePath;
    const cached = xmlCache.get(cacheKey);
    if (cached) {
        return { xmlStr: cached, filePath, fromCache: true };
    }

    let xmlStr = fs.readFileSync(filePath, "utf8");

    // Keep existing normalisation behaviour
    xmlStr = xmlStr.replace(/\t/g, "");
    xmlStr = xmlStr.replace(/\n/g, "");
    xmlStr = xmlStr.replace(/> <"/g, "><");
    xmlStr = xmlStr.toString();

    xmlCache.set(cacheKey, xmlStr);

    return { xmlStr, filePath };
}