/**
 * v0.10.0 Location-spine backfill (Release A).
 *
 * Moves the live Garden off the freeform `Plant.zone` string onto the shared
 * `Location` tree WITHOUT data loss. Run once, right after `migrate deploy`:
 *
 *     npx tsx prisma/scripts/backfill-locations.ts
 *
 * Idempotent: re-running only fills in plants that still lack a locationId and
 * reuses Locations matched case-insensitively by name. Plant.zone is left
 * intact (the dual-write/read safety net) — it is dropped in Release B.
 */
import { PrismaClient } from "@prisma/client";
import { createId } from "@paralleldrive/cuid2";

const db = new PrismaClient();

/** Normalize a zone string for dedup: trim + collapse inner whitespace, case-insensitive key. */
function normKey(zone: string): string {
  return zone.trim().replace(/\s+/g, " ").toLowerCase();
}

async function main() {
  // Plants that have a zone but no location yet.
  const plants = await db.plant.findMany({
    where: { zone: { not: null }, locationId: null },
    select: { id: true, zone: true },
  });

  if (plants.length === 0) {
    console.log("Backfill: no plants need a Location. Done.");
    return;
  }

  // Seed the lookup with any AREA Locations that already exist (idempotent re-runs).
  const existing = await db.location.findMany({
    where: { kind: "AREA" },
    select: { id: true, name: true },
  });
  const byKey = new Map<string, string>(); // normKey → locationId
  for (const loc of existing) byKey.set(normKey(loc.name), loc.id);

  let createdLocations = 0;
  let mappedPlants = 0;

  for (const plant of plants) {
    const raw = (plant.zone ?? "").trim().replace(/\s+/g, " ");
    if (!raw) continue; // empty/whitespace-only zone → leave unmapped
    const key = normKey(raw);

    let locationId = byKey.get(key);
    if (!locationId) {
      locationId = createId();
      await db.location.create({
        data: { id: locationId, name: raw, kind: "AREA" },
      });
      byKey.set(key, locationId);
      createdLocations++;
    }

    await db.plant.update({ where: { id: plant.id }, data: { locationId } });
    mappedPlants++;
  }

  console.log(
    `Backfill complete: created ${createdLocations} Location(s), mapped ${mappedPlants} plant(s).`,
  );
  console.log(
    "Review the Locations list in the UI and merge any near-duplicates before Release B drops Plant.zone.",
  );
}

main()
  .catch((e) => {
    console.error("Backfill failed:", e);
    process.exit(1);
  })
  .finally(() => db.$disconnect());