/**
 * CLI entry point for the Phase 2 canonical backfill.
 *
 * Usage:
 *   npm run backfill:canonical -- [--dry-run | --apply] [--sport=<uuid>]
 *
 * Defaults to --dry-run for safety. No writes will be issued unless
 * --apply is passed explicitly.
 */

import { DatabaseContext } from "~/database/context";
import { db } from "../server/db";
import { runBackfill } from "./backfill-canonical-layer";
import type { BackfillOptions } from "./backfill-canonical-layer";

function printHelp(): void {
  console.log(
    [
      "Usage: backfill-cli [options]",
      "",
      "Options:",
      "  --dry-run         Run without writing (default).",
      "  --apply           Actually write to the database.",
      "  --sport=<uuid>    Only backfill for the given sport id.",
      "  --help            Show this message.",
    ].join("\n"),
  );
}

function parseArgs(): BackfillOptions {
  const args = process.argv.slice(2);
  const opts: BackfillOptions = { dryRun: true }; // dry-run by default for safety
  for (const a of args) {
    if (a === "--apply") {
      opts.dryRun = false;
    } else if (a === "--dry-run") {
      opts.dryRun = true;
    } else if (a.startsWith("--sport=")) {
      opts.sportId = a.slice("--sport=".length);
    } else if (a === "--help" || a === "-h") {
      printHelp();
      process.exit(0);
    } else {
      console.error(`unknown arg: ${a}`);
      process.exit(1);
    }
  }
  return opts;
}

async function main() {
  const opts = parseArgs();
  console.log(
    `Running backfill (dryRun=${opts.dryRun}, sportId=${opts.sportId ?? "all"})`,
  );
  const report = await DatabaseContext.run(db, () => runBackfill(opts));

  console.log("---");
  console.log(`tournamentsCreated:        ${report.tournamentsCreated}`);
  console.log(`tournamentsLinked:         ${report.tournamentsLinked}`);
  console.log(`participantsCreated:       ${report.participantsCreated}`);
  console.log(`participantsLinked:        ${report.participantsLinked}`);
  console.log(`tournamentResultsCreated:  ${report.tournamentResultsCreated}`);
  console.log(`surfaceElosCreated:        ${report.surfaceElosCreated}`);

  if (report.warnings.length) {
    console.log("\nWARNINGS:");
    for (const w of report.warnings) console.log(`  ${w}`);
  }
  if (report.errors.length) {
    console.log("\nERRORS:");
    for (const e of report.errors) console.log(`  ${e}`);
    process.exit(2);
  }
}

main()
  .then(() => process.exit(0))
  .catch((e) => {
    console.error(e);
    process.exit(1);
  });