/**
 * Minimum NTE floor when a new Webex WO space is opened (first webhook).
 * Pure logic — no ServiceChannel client import (safe for unit tests).
 */

function parseNumberEnv(name, fallback) {
  const raw = process.env[name];
  if (raw == null || raw === '') return fallback;
  const n = Number(raw);
  return Number.isFinite(n) ? n : fallback;
}

/** Minimum NTE applied on new space open; 0 disables the feature. */
export function getWoOpenMinNte() {
  return parseNumberEnv('SC_WO_OPEN_MIN_NTE', 400);
}

export function createWorkOrderNteService({
  getWorkOrderForNte: getWo,
  updateWorkOrderNte: updateNte,
} = {}) {
  if (typeof getWo !== 'function' || typeof updateNte !== 'function') {
    throw new Error('createWorkOrderNteService requires getWorkOrderForNte and updateWorkOrderNte');
  }

  async function ensureWorkOrderMinimumNte(woId, { minNte = 400, hintNte = null } = {}) {
    if (!woId || minNte <= 0) return { updated: false, skipped: true };

    let current = hintNte != null ? Number(hintNte) : NaN;
    if (!Number.isFinite(current)) {
      const wo = await getWo(woId);
      current = Number(wo?.Nte);
    }
    if (!Number.isFinite(current) || current >= minNte) {
      return { updated: false, nte: current };
    }

    await updateNte(woId, minNte);
    return { updated: true, previousNte: current, nte: minNte };
  }

  return { ensureWorkOrderMinimumNte };
}