/**
 * Imports a Frollo transaction export into `transactions`.
 *
 *   node --experimental-strip-types scripts/import-frollo.mts --file <csv>
 *   node --experimental-strip-types scripts/import-frollo.mts --file <csv> --apply
 *
 * Dry run by default: it prints exactly what it would do and touches nothing.
 * Rehearse first — the failure mode here is doubling reported income, and the
 * de-duplication rule that shipped second only survived because a dry run was
 * read against the salary rows.
 *
 * Export the file with PENDING TRANSACTIONS EXCLUDED. A pending row changes both
 * its id and its description when it settles, so importing one guarantees a
 * duplicate on the next run; every pending row observed has been on a credit
 * card, which this importer does not cover anyway. See DECISIONS.md ING-11.
 *
 * All parsing, scoping, de-duplication and insertion live in
 * `src/lib/frollo-ingest.ts`, shared with POST /api/frollo/ingest so the manual
 * and automatic paths cannot drift.
 *
 * Needs DATABASE_URL. postgres-personal publishes no host port, so from the host:
 *   export DATABASE_URL="postgresql://personal:<pw>@$(docker inspect postgres-personal \
 *     --format '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}'):5432/personal"
 * The container IP changes on every recreate.
 */
import { readFileSync } from "node:fs";
import pg from "pg";
import { ingestFrolloCsv, LEDGER_MATCH_DAYS, type SqlExecutor } from "../src/lib/frollo-ingest.ts";

function arg(name: string, fallback?: string): string | undefined {
  const i = process.argv.indexOf(`--${name}`);
  if (i >= 0 && process.argv[i + 1] && !process.argv[i + 1].startsWith("--")) return process.argv[i + 1];
  return fallback;
}
const has = (name: string) => process.argv.includes(`--${name}`);

const file = arg("file");
if (!file) {
  console.error("usage: --file <csv> [--apply] [--force] [--owner <id>]");
  process.exit(2);
}
if (!process.env.DATABASE_URL) {
  console.error("DATABASE_URL is not set — cannot compare against the ledger.");
  process.exit(2);
}

const money = (n: number) => n.toLocaleString("en-AU", { minimumFractionDigits: 2, maximumFractionDigits: 2 });

const client = new pg.Client({ connectionString: process.env.DATABASE_URL });
await client.connect();
const exec: SqlExecutor = async <T,>(sql: string, params: unknown[]) =>
  (await client.query(sql, params)).rows as T[];

let report;
try {
  report = await ingestFrolloCsv(readFileSync(file, "utf8"), exec, {
    ownerId: Number(arg("owner", "1")),
    apply: has("apply"),
    force: has("force"),
  });
} finally {
  // Left open, the process hangs after an exception and looks like a slow query.
  if (!has("keep-open")) await client.end().catch(() => {});
}

console.log(`\n${file}`);
console.log(`  ${report.totalRows} rows in file\n`);

console.log("SCOPE");
for (const [why, n] of Object.entries(report.skipped).sort((a, b) => b[1]! - a[1]!)) {
  console.log(`  skipped ${String(n).padStart(5)}  ${why}`);
}
console.log(`  in scope ${String(report.inScope).padStart(4)}\n`);

console.log("ACCOUNTS");
for (const a of report.accounts) {
  console.log(
    `  ${a.present ? " " : "!"} ${a.spec.last4}  ${a.spec.label.padEnd(24)} ${String(a.rows).padStart(5)} rows`
  );
}
if (report.unknownAccounts.length > 0) {
  console.log("\n  accounts in the file this importer does not know (skipped):");
  for (const u of report.unknownAccounts) {
    console.log(`    ${u.accountNumber}  ${u.accountName}  ${u.rows} rows`);
  }
}
console.log();

console.log("DE-DUPLICATION  (re-ingest twins from CDR re-consent)");
console.log(`  ${report.duplicatesDropped} dropped`);
if (report.suspectRepeats.length > 0) {
  console.log(`\n  REVIEW: ${report.suspectRepeats.length} collapsed row(s) had near-consecutive ids`);
  console.log("          and may be real repeats rather than duplicates:");
  for (const s of report.suspectRepeats.slice(0, 10)) {
    console.log(`    ${s.transactionDate} ${money(s.amount).padStart(11)} ${s.description.slice(0, 40)} (gap ${s.idGap})`);
  }
}
console.log();

console.log("LEDGER");
console.log(`  already imported : ${String(report.alreadyImported).padStart(5)}`);
// Printed even when zero. This is the count that was missing on 2026-08-13,
// when the whole file was written on top of a ledger that already held 77% of
// it; a number you have to go looking for is a number nobody looks at.
console.log(`  already on ledger: ${String(report.ledgerDuplicates).padStart(5)}  (statement twin within ${LEDGER_MATCH_DAYS} days)`);
console.log(`  new to insert    : ${String(report.toInsert).padStart(5)}`);

if (report.anomalies.length > 0) {
  console.log("\nANOMALIES");
  for (const a of report.anomalies) console.log(`  ! ${a}`);
}

if (report.applied) {
  console.log(`\nInserted ${report.inserted} row(s).\n`);
} else if (report.anomalies.length > 0 && has("apply")) {
  console.log("\nNOT APPLIED — anomalies above. Read them, then re-run with --force.\n");
  process.exit(1);
} else {
  console.log("\nDRY RUN — nothing written. Re-run with --apply to insert.\n");
}