/**
 * One-shot migration: legacy NocoDB Interests → new client/interest split.
 *
 * Usage:
 *
 *   pnpm tsx scripts/migrate-from-nocodb.ts --dry-run
 *     Pulls the live NocoDB base, runs the transform + dedup pipeline,
 *     writes a report to .migration/<timestamp>/. NO database writes.
 *
 *   pnpm tsx scripts/migrate-from-nocodb.ts --dry-run --port-slug harbor-royale
 *     Same, but tags the planned writes with the named port (matters for
 *     the apply phase — every client/interest belongs to one port).
 *
 *   pnpm tsx scripts/migrate-from-nocodb.ts --apply --report .migration/<dir>/
 *     [Not yet implemented — apply phase comes in a follow-up PR.]
 *
 * Design reference: docs/superpowers/specs/2026-05-03-dedup-and-migration-design.md §9.
 */

import 'dotenv/config';

import path from 'node:path';
import { fileURLToPath } from 'node:url';

import { fetchSnapshot, loadNocoDbConfig } from '@/lib/dedup/nocodb-source';
import { transformSnapshot } from '@/lib/dedup/migration-transform';
import { resolveReportPaths, writeReport } from '@/lib/dedup/migration-report';

interface CliArgs {
  dryRun: boolean;
  apply: boolean;
  portSlug: string | null;
  reportDir: string | null;
}

function parseArgs(argv: string[]): CliArgs {
  const args: CliArgs = {
    dryRun: false,
    apply: false,
    portSlug: null,
    reportDir: null,
  };
  for (let i = 0; i < argv.length; i += 1) {
    const a = argv[i]!;
    if (a === '--dry-run') args.dryRun = true;
    else if (a === '--apply') args.apply = true;
    else if (a === '--port-slug') args.portSlug = argv[++i] ?? null;
    else if (a === '--report') args.reportDir = argv[++i] ?? null;
    else if (a === '-h' || a === '--help') {
      printHelp();
      process.exit(0);
    } else {
      console.error(`Unknown argument: ${a}`);
      printHelp();
      process.exit(1);
    }
  }
  return args;
}

function printHelp(): void {
  console.log(`Usage:
  pnpm tsx scripts/migrate-from-nocodb.ts --dry-run [--port-slug <slug>]
    Pulls NocoDB → transforms → writes report to .migration/<timestamp>/.
    No database writes.

  pnpm tsx scripts/migrate-from-nocodb.ts --apply --report .migration/<dir>/
    Apply phase. (Not yet implemented.)

Flags:
  --dry-run               Read NocoDB, write report only.
  --apply                 Actually write to the new DB. (Not yet supported.)
  --port-slug <slug>      Port slug to attach to all imported entities.
                          Defaults to the first available port if omitted.
  --report <dir>          Path to a previously-generated report dir
                          (only used by --apply).
  -h, --help              Show this help.
`);
}

async function main(): Promise<void> {
  const args = parseArgs(process.argv.slice(2));

  if (!args.dryRun && !args.apply) {
    console.error('Must specify --dry-run or --apply');
    printHelp();
    process.exit(1);
  }

  if (args.apply) {
    console.error('--apply is not yet implemented in this version. P3 ships dry-run first.');
    console.error('See docs/superpowers/specs/2026-05-03-dedup-and-migration-design.md §9.2.');
    process.exit(2);
  }

  // ── Dry-run path ───────────────────────────────────────────────────────────

  console.log('[migrate] Loading NocoDB config…');
  const config = loadNocoDbConfig();
  console.log(`[migrate] Source: ${config.url}`);

  console.log('[migrate] Fetching snapshot from NocoDB…');
  const start = Date.now();
  const snapshot = await fetchSnapshot(config);
  const elapsed = ((Date.now() - start) / 1000).toFixed(1);
  console.log(
    `[migrate] Snapshot fetched in ${elapsed}s — ${snapshot.interests.length} interests, ${snapshot.residentialInterests.length} residential, ${snapshot.berths.length} berths.`,
  );

  console.log('[migrate] Running transform + dedup pipeline…');
  const plan = transformSnapshot(snapshot);

  // Resolve output paths relative to the worktree root (the script itself
  // lives in scripts/; we want the .migration dir at the repo root).
  const scriptDir = path.dirname(fileURLToPath(import.meta.url));
  const repoRoot = path.resolve(scriptDir, '..');
  const generatedAt = new Date().toISOString();
  const paths = resolveReportPaths(repoRoot);

  console.log(`[migrate] Writing report to ${paths.rootDir}…`);
  await writeReport(paths, plan, generatedAt);

  // ── Console summary ──────────────────────────────────────────────────────
  const s = plan.stats;
  console.log('');
  console.log('=== Migration Plan Summary ===');
  console.log(
    `  Input:     ${s.inputInterestRows} interests, ${s.inputResidentialRows} residential interests`,
  );
  console.log(`  Output:    ${s.outputClients} clients, ${s.outputInterests} interests`);
  console.log(`             ${s.outputContacts} contacts, ${s.outputAddresses} addresses`);
  console.log(
    `  Dedup:     ${s.autoLinkedClusters} auto-linked clusters, ${s.needsReviewPairs} pairs flagged for review`,
  );
  console.log(`  Quality:   ${s.flaggedRows} rows flagged (see report.csv)`);
  console.log('');
  console.log(`  Full report: ${paths.summaryPath}`);
  console.log('');
}

main().catch((err) => {
  console.error('[migrate] Fatal error:', err);
  process.exit(1);
});