brackt/app/routes/api/draft.rollback.ts

import { auth } from "~/lib/auth.server";
import { database } from "~/database/context";
import * as schema from "~/database/schema";
import { eq, and, gte } from "drizzle-orm";
import { isCommissioner } from "~/models/commissioner";
import { logCommissionerAction } from "~/models/audit-log";
import { getSocketIO } from "../../../server/socket";
import { onDraftRolledBack } from "../../../server/timer";
import { logger } from "~/lib/logger";
import { runBracktHarvilleForFantasySeason } from "~/services/brackt.server";

import type { ActionFunctionArgs } from "react-router";
export async function action(args: ActionFunctionArgs) {
  const { request } = args;
  const session = await auth.api.getSession({ headers: args.request.headers });
  const userId = session?.user.id ?? null;

  if (!userId) {
    return Response.json({ error: "Unauthorized" }, { status: 401 });
  }

  const formData = await request.formData();
  const seasonId = formData.get("seasonId") as string;
  const pickNumber = parseInt(formData.get("pickNumber") as string);

  if (!seasonId || isNaN(pickNumber) || pickNumber < 1) {
    return Response.json({ error: "Missing required fields" }, { status: 400 });
  }

  const db = database();

  const season = await db.query.seasons.findFirst({
    where: eq(schema.seasons.id, seasonId),
  });

  if (!season) {
    return Response.json({ error: "Season not found" }, { status: 404 });
  }

  if (!(await isCommissioner(season.leagueId, userId))) {
    return Response.json({ error: "Only commissioners can roll back the draft" }, { status: 403 });
  }

  if (season.status !== "draft") {
    return Response.json(
      { error: "Cannot roll back a draft that is not in progress" },
      { status: 400 }
    );
  }

  const draftSlots = await db.query.draftSlots.findMany({
    where: eq(schema.draftSlots.seasonId, seasonId),
    orderBy: schema.draftSlots.draftOrder,
  });

  const totalTeams = draftSlots.length;

  if (totalTeams === 0) {
    return Response.json({ error: "No draft slots found for this season" }, { status: 400 });
  }

  // Calculate which team is on the clock at the rollback pick (snake draft)
  const round = Math.ceil(pickNumber / totalTeams);
  const isEvenRound = round % 2 === 0;
  let pickInRound = ((pickNumber - 1) % totalTeams) + 1;
  if (isEvenRound) {
    pickInRound = totalTeams - pickInRound + 1;
  }
  const rollbackSlot = draftSlots.find((slot) => slot.draftOrder === pickInRound);

  // Delete picks from pickNumber onwards
  await db
    .delete(schema.draftPicks)
    .where(
      and(
        eq(schema.draftPicks.seasonId, seasonId),
        gte(schema.draftPicks.pickNumber, pickNumber)
      )
    );

  // Update season: reset pick number and pause so the commissioner can review
  // before picks resume. They must explicitly hit Resume to restart the clock.
  await db
    .update(schema.seasons)
    .set({
      currentPickNumber: pickNumber,
      draftPaused: true,
    })
    .where(eq(schema.seasons.id, seasonId));

  await logCommissionerAction({
    seasonId,
    leagueId: season.leagueId,
    actorUserId: userId,
    action: "draft_rollback",
    affectedTeamIds: rollbackSlot?.teamId ? [rollbackSlot.teamId] : [],
    details: {
      rolledBackToPickNumber: pickNumber,
      previousPickNumber: season.currentPickNumber,
    },
  });

  try {
    const io = getSocketIO();
    // Roll-back leaves the draft paused so the commissioner reviews before resuming.
    io.to(`draft-${seasonId}`).emit("draft-paused", { seasonId, paused: true });
    io.to(`draft-${seasonId}`).emit("draft-rolled-back", {
      seasonId,
      pickNumber,
      teamId: rollbackSlot?.teamId,
    });
  } catch (error) {
    logger.error("Socket.IO error:", error);
  }

  try {
    const updates = await runBracktHarvilleForFantasySeason(seasonId, db);
    if (updates.length > 0) {
      getSocketIO().to(`draft-${seasonId}`).emit("brackt-evs-updated", { updates });
    }
  } catch (error) {
    logger.error("[Rollback] Brackt EV update failed:", error);
  }

  // Reset all timer rows to the initial bank and reschedule the clock from scratch.
  // Timer rows are not rolled back by the picks delete above, so without this they
  // would show banked values from the picks that were just deleted (e.g. 2:08, 2:07).
  const initialTime =
    season.draftTimerMode === "standard"
      ? (season.draftIncrementTime || 30)
      : (season.draftInitialTime || 120);
  try {
    await onDraftRolledBack(seasonId, initialTime);
  } catch (err) {
    logger.error("[Rollback] onDraftRolledBack failed:", err);
  }

  return Response.json({ success: true, pickNumber });
}