/**
 * One-off generator, run by hand whenever the catalog's reference data
 * changes (a new ingredient/diet/allergen added to
 * `db/reference-seed-data.ts`): derives every row's slug `key` from its
 * French name (see `slugify.ts`), fails loudly on any collision, and
 * regenerates `apps/web/src/locales/fr/translation.json`'s
 * `catalog.{diets,allergens,ingredients}` sections (key -> French label),
 * merged in without touching the rest of the file.
 *
 * Also (re-)writes `backfill.sql` alongside itself — the `UPDATE ... SET
 * key = ...` statements a migration adding a brand new item needs to carry
 * forward, in case that ever happens again; the one for this refactor's own
 * migration (`prisma/migrations/20260818190000_catalog_labels_to_keys/`)
 * was generated once and copied in by hand, and `backfill.sql` itself is
 * gitignored scratch output, not the source of truth.
 *
 * Never imported by the app itself — a dev-time tool, run via
 * `tsx scripts/generate-catalog-i18n.ts`.
 */
import { readFileSync, writeFileSync } from "node:fs";
import { fileURLToPath } from "node:url";
import { ALLERGENS, DIETS, INGREDIENT_GROUPS } from "../src/db/reference-seed-data.js";
import { slugify } from "../src/utils/slugify.js";

const here = fileURLToPath(new URL(".", import.meta.url));

function toKeyLabelMap(labels: string[]): Record<string, string> {
  const map: Record<string, string> = {};
  const seenKeys = new Map<string, string>();
  for (const label of labels) {
    const key = slugify(label);
    const clashingLabel = seenKeys.get(key);
    if (clashingLabel !== undefined && clashingLabel !== label) {
      throw new Error(`Slug collision: "${clashingLabel}" and "${label}" both slugify to "${key}"`);
    }
    seenKeys.set(key, label);
    map[key] = label;
  }
  return map;
}

const dietLabels = DIETS;
const allergenLabels = ALLERGENS.map((a) => a.name);
const ingredientLabels = INGREDIENT_GROUPS.flatMap((g) => g.items.map((i) => i.name));

const diets = toKeyLabelMap(dietLabels);
const allergens = toKeyLabelMap(allergenLabels);
const ingredients = toKeyLabelMap(ingredientLabels);

console.log(
  `diets: ${Object.keys(diets).length}, allergens: ${Object.keys(allergens).length}, ingredients: ${Object.keys(ingredients).length}`,
);

// --- Merge into the fr locale file -----------------------------------------
const localePath = here + "../../web/src/locales/fr/translation.json";
const locale = JSON.parse(readFileSync(localePath, "utf8"));
locale.catalog = { diets, allergens, ingredients };
writeFileSync(localePath, JSON.stringify(locale, null, 2) + "\n");
console.log(`wrote ${localePath}`);

// --- Emit the migration's backfill SQL --------------------------------------
function escapeSql(value: string): string {
  return value.replace(/'/g, "''");
}

// The migration this feeds renames each table's "name" column to "key"
// *before* running this backfill — so by the time these UPDATEs run, the
// "key" column still holds the old French label value (just under its new
// column name), which is exactly what the WHERE clause below matches on.
const dietUpdates = Object.entries(diets)
  .map(([key, label]) => `UPDATE "diet" SET "key" = '${escapeSql(key)}' WHERE "key" = '${escapeSql(label)}';`)
  .join("\n");
const categoryUpdates = Object.entries(allergens)
  .map(
    ([key, label]) => `UPDATE "category" SET "key" = '${escapeSql(key)}' WHERE "key" = '${escapeSql(label)}';`,
  )
  .join("\n");
const ingredientUpdates = Object.entries(ingredients)
  .map(
    ([key, label]) =>
      `UPDATE "ingredients" SET "key" = '${escapeSql(key)}' WHERE "key" = '${escapeSql(label)}';`,
  )
  .join("\n");

const sql = `-- Auto-generated by scripts/generate-catalog-i18n.ts — do not hand-edit.
-- Backfills the "key" column (just renamed from "name" by this migration's
-- preceding statement, so it still holds the old French label) to its slug
-- value, for every row already seeded in a database this migration runs
-- against. A fresh database has none of these rows yet (the seed script
-- inserts by "key" from the start), so this is a no-op there.

${dietUpdates}

${categoryUpdates}

${ingredientUpdates}
`;
writeFileSync(here + "backfill.sql", sql);
console.log(`wrote ${here}backfill.sql`);