import { eq } from "drizzle-orm";
import * as schema from "~/database/schema";
import type { database } from "~/database/context";
import { findDiscordIdsByUserIds } from "~/models/account";
import { sendPickAnnouncementNotification } from "~/services/discord";

type DraftSlot = { teamId: string; draftOrder: number };

// Inline snake-draft pick calculation — mirrors calculatePickInfo in draft-utils.ts
// without creating a circular import (draft-utils imports this module).
function pickInRoundFor(pickNumber: number, teamCount: number): number {
  const round = Math.ceil(pickNumber / teamCount);
  const rawPickInRound = ((pickNumber - 1) % teamCount) + 1;
  const isOddRound = round % 2 === 1;
  const teamIndex = isOddRound ? rawPickInRound - 1 : teamCount - rawPickInRound;
  return teamIndex + 1;
}

export async function notifyPickMadeOnDiscord(params: {
  seasonId: string;
  leagueId: string;
  pickedTeamName: string;
  participantName: string;
  sportName: string;
  pickNumber: number;
  round: number;
  pickInRound: number;
  isDraftComplete: boolean;
  totalTeams: number;
  draftSlots: DraftSlot[];
  db: ReturnType<typeof database>;
}): Promise<void> {
  const {
    seasonId,
    leagueId,
    pickedTeamName,
    participantName,
    sportName,
    pickNumber,
    round,
    pickInRound,
    isDraftComplete,
    totalTeams,
    draftSlots,
    db,
  } = params;

  const league = await db.query.leagues.findFirst({
    where: eq(schema.leagues.id, leagueId),
  });
  if (!league?.discordWebhookUrl || !league.discordPicksAnnouncementEnabled) return;

  const appUrl = process.env.APP_URL ?? "https://brackt.com";
  const draftUrl = `${appUrl}/leagues/${leagueId}/draft/${seasonId}`;

  let nextTeamName: string | undefined;
  let nextOwnerDiscordId: string | undefined;

  if (!isDraftComplete) {
    // Read currentPickNumber fresh from DB so we see the post-autodraft-chain state,
    // matching the same guarantee sendOnTheClockEmail provides.
    const freshSeason = await db.query.seasons.findFirst({
      where: eq(schema.seasons.id, seasonId),
    });
    if (freshSeason) {
      const nextPickInRound = pickInRoundFor(freshSeason.currentPickNumber ?? 1, totalTeams);
      const nextSlot = draftSlots.find((s) => s.draftOrder === nextPickInRound);
      if (nextSlot) {
        const nextTeam = await db.query.teams.findFirst({
          where: eq(schema.teams.id, nextSlot.teamId),
        });
        if (nextTeam) {
          nextTeamName = nextTeam.name;
          if (nextTeam.ownerId) {
            const owner = await db.query.users.findFirst({
              where: eq(schema.users.id, nextTeam.ownerId),
            });
            if (owner?.discordPingEnabled) {
              const discordIds = await findDiscordIdsByUserIds([owner.id]);
              nextOwnerDiscordId = discordIds.get(owner.id);
            }
          }
        }
      }
    }
  }

  await sendPickAnnouncementNotification({
    webhookUrl: league.discordWebhookUrl,
    draftUrl,
    pickNumber,
    round,
    pickInRound,
    pickedTeamName,
    participantName,
    sportName,
    nextTeamName,
    nextOwnerDiscordId,
    isDraftComplete,
  });
}