/**
 * Backfill: re-score qualifying majors so mis-split QP is corrected.
 *
 * Sibling/mirror windows used to compute a placement's tie span from the players
 * present on THAT window's roster (a subset of the field), so a tied group split
 * fewer ways and over-awarded — tennis Round-of-16 losers landed at 2 QP instead of
 * the correct 1.5 (positions 9–16: (2+2+2+2+1+1+1+1)/8). processQualifyingEvent now
 * derives the tie span from the canonical full field, so re-running the fan-out
 * rewrites the stored event_results QP, participant totals, and league standings.
 *
 * This is idempotent and SILENT: notifications are suppressed so re-scoring history
 * (2 → 1.5 for many participants) does not re-ping every league's Discord. It does
 * NOT re-link events or designate primaries — run backfill-major-linking.ts first if
 * the data predates the shared-major model. majorsCompleted needs no fix (it is now
 * derived on read from completed qualifying events).
 *
 * Safe to re-run. Validate on a DB snapshot first. Reads DATABASE_URL.
 *
 *   npx tsx scripts/backfill-qp-resplit.ts          # apply
 *   npx tsx scripts/backfill-qp-resplit.ts --dry    # report only
 */

import { drizzle } from "drizzle-orm/postgres-js";
import postgres from "postgres";
import { eq } from "drizzle-orm";
import * as schema from "../database/schema.js";
import { DatabaseContext, database } from "../database/context.js";
import { isBracketMajor } from "../app/lib/event-utils.js";
import {
  syncTournamentResults,
  syncMajorFromPrimaryEvent,
} from "../app/services/sync-tournament-results.js";

const DRY = process.argv.includes("--dry");
const log = (...a: unknown[]) => console.log(...a);

async function run() {
  const db = database();

  // Every tournament-linked qualifying event, grouped by canonical tournament.
  const events = await db.query.scoringEvents.findMany({
    where: eq(schema.scoringEvents.isQualifyingEvent, true),
    with: { sportsSeason: { with: { sport: true } } },
  });
  const byTournament = new Map<string, typeof events>();
  for (const ev of events) {
    if (!ev.tournamentId) continue; // standalone/manual events: nothing to fan out
    const arr = byTournament.get(ev.tournamentId) ?? [];
    arr.push(ev);
    byTournament.set(ev.tournamentId, arr);
  }

  log(`Tournaments with linked qualifying events: ${byTournament.size}`);
  let ok = 0;
  let failed = 0;

  for (const [tournamentId, evs] of byTournament) {
    const simulatorType = evs[0]?.sportsSeason?.sport?.simulatorType ?? null;
    const bracketMajor = isBracketMajor(simulatorType);
    const name = evs[0]?.name ?? tournamentId;

    // Only re-score fully-scored majors so we don't mark in-progress ones complete.
    const anyComplete = evs.some((e) => e.isComplete);
    const markComplete = evs.every((e) => e.isComplete);

    if (DRY) {
      log(
        `  (dry) ${name}: ${evs.length} window(s), bracket=${bracketMajor}, ` +
          `complete=${markComplete} — would re-score silently`
      );
      continue;
    }

    try {
      if (bracketMajor) {
        // Re-derive canonical from the primary, then fan out to siblings (which now
        // split ties by the full field). Primary is scored in place and skipped.
        const primary = evs.find((e) => e.isPrimary);
        if (!primary) {
          log(`  ! ${name}: no primary window — skipping (run backfill-major-linking.ts)`);
          failed += 1;
          continue;
        }
        const report = await syncMajorFromPrimaryEvent(primary.id, {
          markComplete,
          skipNotifications: true,
        });
        ok += report.windowsSynced;
        failed += report.windowsFailed;
        log(
          `  ${name}: re-scored via primary — ${report.windowsSynced} ok, ${report.windowsFailed} failed`
        );
      } else {
        // Golf/placement: canonical tournament_results already exist; just fan out.
        if (!anyComplete) {
          log(`  ${name}: no completed window — skipping`);
          continue;
        }
        const report = await syncTournamentResults(tournamentId, {
          markComplete,
          skipNotifications: true,
        });
        ok += report.windowsSynced;
        failed += report.windowsFailed;
        log(
          `  ${name}: re-scored — ${report.windowsSynced} ok, ${report.windowsFailed} failed`
        );
      }
    } catch (e) {
      failed += 1;
      log(`  ! ${name}: ${(e as Error).message}`);
    }
  }

  log(`\nDone${DRY ? " (dry run — no writes)" : ""}. windows ok=${ok}, failed=${failed}.`);
}

async function main() {
  const dbUrl = process.env.DATABASE_URL;
  if (!dbUrl) {
    console.error("ERROR: DATABASE_URL is required");
    process.exit(1);
  }
  const client = postgres(dbUrl, { max: 1 });
  const db = drizzle(client, { schema });
  try {
    await DatabaseContext.run(db, run);
  } finally {
    await client.end();
  }
}

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