/**
 * Ensures every drizzle/*.sql migration file has a matching entry in meta/_journal.json.
 * Run: bun scripts/verify-drizzle-journal.ts
 */
import { readdirSync, readFileSync } from "fs";
import path from "path";

const drizzleDir = path.resolve(import.meta.dir, "../drizzle");
const journalPath = path.join(drizzleDir, "meta/_journal.json");

const journal = JSON.parse(readFileSync(journalPath, "utf8")) as {
  entries: Array<{ idx: number; tag: string; when: number }>;
};

const sqlTags = readdirSync(drizzleDir)
  .filter((name) => /^\d+_.+\.sql$/.test(name))
  .map((name) => name.replace(/\.sql$/, ""))
  .sort();

const journalTags = journal.entries.map((entry) => entry.tag).sort();

const missingFromJournal = sqlTags.filter((tag) => !journalTags.includes(tag));
const missingSql = journalTags.filter((tag) => !sqlTags.includes(tag));

const idxSequence = journal.entries.map((entry) => entry.idx);
const expectedIdx = journal.entries.map((_, i) => i);
const badIdx = idxSequence.some((idx, i) => idx !== expectedIdx[i]);

// drizzle's migrator gates on the single highest `when` already recorded in
// the target DB — it doesn't check hashes per-migration. If `when` values
// ever go non-increasing (e.g. a migration got deleted/renumbered after
// being applied to some environment), later entries can silently be skipped
// forever even though drizzle reports success. Keep this strictly increasing.
//
// 0008 and 0011 are known pre-existing exceptions from before this check
// existed (see git log on those files) — both already guard every statement
// with IF NOT EXISTS specifically because of this, so a skip is harmless.
// Don't add new exceptions here; fix the timestamp instead.
const KNOWN_NON_MONOTONIC_TAGS = new Set([
  "0008_payments_recurring_public_links",
  "0011_time_entry_invoice_id",
]);
const nonMonotonic = journal.entries.some(
  (entry, i) =>
    i > 0 &&
    entry.when <= journal.entries[i - 1]!.when &&
    !KNOWN_NON_MONOTONIC_TAGS.has(entry.tag),
);

let failed = false;

if (missingFromJournal.length > 0) {
  console.error("[verify-drizzle-journal] SQL files missing from journal:");
  for (const tag of missingFromJournal) console.error(`  - ${tag}`);
  failed = true;
}

if (missingSql.length > 0) {
  console.error("[verify-drizzle-journal] Journal entries without SQL files:");
  for (const tag of missingSql) console.error(`  - ${tag}`);
  failed = true;
}

if (badIdx) {
  console.error("[verify-drizzle-journal] Journal idx values are not sequential from 0");
  failed = true;
}

if (nonMonotonic) {
  console.error(
    "[verify-drizzle-journal] Journal `when` timestamps are not strictly increasing. " +
      "drizzle-orm's migrator only compares against the single highest `when` already " +
      "applied in the target DB, so a lower or equal value here can cause migrations to " +
      "be silently skipped on databases that already ran a later timestamp.",
  );
  failed = true;
}

if (failed) {
  process.exit(1);
}

console.log(
  `[verify-drizzle-journal] OK — ${sqlTags.length} migrations match journal entries`,
);