import { existsSync, readFileSync } from 'node:fs';
import { FOOD_GROUPS, type FoodGroup } from '../groups.ts';

// Groups two models of different families agreed on for records whose source gives no category (20 FD-09).
// `scripts/food-assign-groups.mjs` writes the file, one {"key":"SRC-06|<record id>","group":"…"} per line;
// CALSA_GROUP_ASSIGNMENTS names it. Without the variable nothing is assigned.
let table: Map<string, FoodGroup> | undefined;
export function assignedGroup(src: string, recordId: string): FoodGroup | null {
  if (!table) {
    table = new Map();
    const path = process.env.CALSA_GROUP_ASSIGNMENTS;
    if (path && existsSync(path)) for (const line of readFileSync(path, 'utf8').split('\n')) {
      if (!line) continue;
      const { key, group } = JSON.parse(line) as { key: string; group: string };
      if ((FOOD_GROUPS as readonly string[]).includes(group)) table.set(key, group as FoodGroup);
    }
  }
  return table.get(`${src}|${recordId}`) ?? null;
}