import { database } from "~/database/context";
import * as schema from "~/database/schema";
import { eq, and, desc, asc, gte, lte, or, inArray, isNotNull, sql } from "drizzle-orm";
import type { BracketRegion } from "~/lib/bracket-templates";
import { recalculateAffectedLeagues } from "./scoring-calculator";
import { hasProcessedQualifyingPlacement, recalculateParticipantQP } from "./qualifying-points";
import { findParticipantNamesByIds } from "./season-participant";
import { deleteTournament } from "./tournament";
import type { EventType } from "./scoring-event-types";
export { type EventType, getEventTypeLabel } from "./scoring-event-types";

export interface CreateScoringEventData {
  sportsSeasonId: string;
  name: string;
  eventDate?: Date;
  eventStartsAt?: Date;
  eventType: EventType;
  isQualifyingEvent?: boolean;
  /** Required when isQualifyingEvent=true (DB check constraint). */
  tournamentId?: string;
  // Template system fields (Phase 2.6)
  bracketTemplateId?: string;
  scoringStartsAtRound?: string;
}

export interface UpdateScoringEventData {
  name?: string;
  eventDate?: Date | null;
  eventStartsAt?: Date | null;
  isComplete?: boolean;
  completedAt?: Date;
  bracketTemplateId?: string;
  scoringStartsAtRound?: string;
  /** Per-event region config for NCAA-style brackets (overrides template defaults) */
  bracketRegionConfig?: BracketRegion[] | null;
  /** External data-source locator (e.g. Wikipedia article title for tennis draws) */
  externalSourceKey?: string | null;
}

/**
 * Create a new scoring event
 */
export async function createScoringEvent(
  data: CreateScoringEventData,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  const [event] = await db
    .insert(schema.scoringEvents)
    .values({
      sportsSeasonId: data.sportsSeasonId,
      name: data.name,
      eventDate: data.eventDate ? data.eventDate.toISOString().split('T')[0] : undefined,
      eventStartsAt: data.eventStartsAt,
      eventType: data.eventType,
      isQualifyingEvent: data.isQualifyingEvent || false,
      tournamentId: data.tournamentId,
      bracketTemplateId: data.bracketTemplateId,
      scoringStartsAtRound: data.scoringStartsAtRound,
      isComplete: false,
    })
    .returning();

  return event;
}

/**
 * Get a scoring event by ID
 */
export async function getScoringEventById(
  eventId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return await db.query.scoringEvents.findFirst({
    where: eq(schema.scoringEvents.id, eventId),
    with: {
      sportsSeason: {
        with: {
          sport: true,
        },
      },
    },
  });
}

/**
 * Get all scoring events for a sports season
 */
export async function getScoringEventsForSportsSeason(
  sportsSeasonId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return await db.query.scoringEvents.findMany({
    where: eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
    orderBy: [desc(schema.scoringEvents.eventDate), desc(schema.scoringEvents.eventStartsAt), desc(schema.scoringEvents.createdAt)],
    with: {
      eventResults: {
        with: {
          seasonParticipant: true,
        },
      },
    },
  });
}

/**
 * Get incomplete scoring events for a sports season
 */
export async function getIncompleteScoringEvents(
  sportsSeasonId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return await db.query.scoringEvents.findMany({
    where: and(
      eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
      eq(schema.scoringEvents.isComplete, false)
    ),
    orderBy: [desc(schema.scoringEvents.eventDate), desc(schema.scoringEvents.createdAt)],
  });
}

/**
 * Get qualifying events for a sports season
 */
export async function getQualifyingEvents(
  sportsSeasonId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return await db.query.scoringEvents.findMany({
    where: and(
      eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
      eq(schema.scoringEvents.isQualifyingEvent, true)
    ),
    orderBy: [desc(schema.scoringEvents.eventDate), desc(schema.scoringEvents.createdAt)],
  });
}

/**
 * Update a scoring event
 */
export async function updateScoringEvent(
  eventId: string,
  data: UpdateScoringEventData,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  const updateData: Partial<typeof schema.scoringEvents.$inferInsert> = { updatedAt: new Date() };

  if (data.name !== undefined) updateData.name = data.name;
  if (data.eventDate !== undefined) {
    updateData.eventDate = data.eventDate ? data.eventDate.toISOString().split('T')[0] : null;
  }
  if (data.eventStartsAt !== undefined) updateData.eventStartsAt = data.eventStartsAt;
  if (data.isComplete !== undefined) updateData.isComplete = data.isComplete;
  if (data.completedAt !== undefined) updateData.completedAt = data.completedAt;
  if (data.bracketTemplateId !== undefined) updateData.bracketTemplateId = data.bracketTemplateId;
  if (data.scoringStartsAtRound !== undefined) updateData.scoringStartsAtRound = data.scoringStartsAtRound;
  if (data.bracketRegionConfig !== undefined) updateData.bracketRegionConfig = data.bracketRegionConfig;
  if (data.externalSourceKey !== undefined) updateData.externalSourceKey = data.externalSourceKey;

  const [updated] = await db
    .update(schema.scoringEvents)
    .set(updateData)
    .where(eq(schema.scoringEvents.id, eventId))
    .returning();

  return updated;
}

/**
 * Mark a scoring event as complete
 */
export async function completeScoringEvent(
  eventId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return await updateScoringEvent(
    eventId,
    {
      isComplete: true,
      completedAt: new Date(),
    },
    db
  );
}

/**
 * Delete a scoring event.
 * For bracket events (playoff_game), also clears all participant results for the
 * sports season (placements are stored there with no FK back to the event) and
 * recalculates league standings.
 */
export interface DeleteScoringEventOptions {
  /**
   * When this was the last window linked to its shared tournament, also delete
   * the now-orphaned canonical tournament (and its results). No-op when other
   * windows remain. Off by default so deleting one season's event never touches
   * the shared tournament unless explicitly requested.
   */
  deleteOrphanTournament?: boolean;
}

export interface DeleteScoringEventResult {
  /** The shared tournament this event was linked to, if any. */
  tournamentId: string | null;
  /** How many other windows still link to that tournament after the delete. */
  remainingWindows: number;
  /** Event promoted to primary because the deleted event was the primary window. */
  promotedPrimaryId: string | null;
  /** Whether the orphaned canonical tournament was deleted. */
  deletedTournament: boolean;
}

export async function deleteScoringEvent(
  eventId: string,
  providedDb?: ReturnType<typeof database>,
  opts?: DeleteScoringEventOptions
): Promise<DeleteScoringEventResult> {
  const db = providedDb || database();

  const event = await db.query.scoringEvents.findFirst({
    where: eq(schema.scoringEvents.id, eventId),
  });

  if (!event) {
    return {
      tournamentId: null,
      remainingWindows: 0,
      promotedPrimaryId: null,
      deletedTournament: false,
    };
  }

  // For qualifying events: capture affected participant IDs before the cascade deletes
  // eventResults (which is how we know who had QP awarded from this event).
  let affectedParticipantIds: string[] = [];
  let wasQPProcessed = false;
  if (event.isQualifyingEvent) {
    const results = await db.query.eventResults.findMany({
      where: eq(schema.eventResults.scoringEventId, eventId),
    });
    affectedParticipantIds = results.map((r) => r.seasonParticipantId);
    wasQPProcessed = hasProcessedQualifyingPlacement(results);
  }

  await db.transaction(async (tx) => {
    if (event.eventType === "playoff_game" || event.eventType === "major_tournament") {
      await tx
        .delete(schema.seasonParticipantResults)
        .where(eq(schema.seasonParticipantResults.sportsSeasonId, event.sportsSeasonId));
    }
    // Cascades: playoffMatches, eventResults, tournamentGroups/Members
    await tx.delete(schema.scoringEvents).where(eq(schema.scoringEvents.id, eventId));
  });

  if (event.eventType === "playoff_game" || event.eventType === "major_tournament") {
    await recalculateAffectedLeagues(event.sportsSeasonId, db);
  }

  if (event.isQualifyingEvent && affectedParticipantIds.length > 0) {
    // eventResults have been cascade-deleted; recalculate QP totals from remaining events
    for (const participantId of affectedParticipantIds) {
      await recalculateParticipantQP(participantId, event.sportsSeasonId, db);
    }

    // Decrement majorsCompleted if this event had already been processed
    if (wasQPProcessed) {
      const sportsSeason = await db.query.sportsSeasons.findFirst({
        where: eq(schema.sportsSeasons.id, event.sportsSeasonId),
      });
      if (sportsSeason && (sportsSeason.majorsCompleted ?? 0) > 0) {
        await db
          .update(schema.sportsSeasons)
          .set({ majorsCompleted: (sportsSeason.majorsCompleted ?? 1) - 1, updatedAt: new Date() })
          .where(eq(schema.sportsSeasons.id, event.sportsSeasonId));
      }
    }

    await recalculateAffectedLeagues(event.sportsSeasonId, db);
  }

  // Shared-tournament bookkeeping: keep the primary window valid and optionally
  // clean up a canonical tournament left with no windows.
  let remainingWindows = 0;
  let promotedPrimaryId: string | null = null;
  let deletedTournament = false;

  if (event.tournamentId) {
    const remaining = await db.query.scoringEvents.findMany({
      where: eq(schema.scoringEvents.tournamentId, event.tournamentId),
      orderBy: asc(schema.scoringEvents.createdAt),
    });
    remainingWindows = remaining.length;

    if (remaining.length > 0) {
      // Auto-heal: if the deleted event was the primary window (or no sibling is
      // flagged primary anymore), promote the earliest remaining window so the
      // shared major stays scorable and fan-out stays deterministic.
      const hasPrimary = remaining.some((e) => e.isPrimary);
      if (event.isPrimary || !hasPrimary) {
        await setPrimaryEvent(remaining[0].id, db);
        promotedPrimaryId = remaining[0].id;
      }
    } else if (opts?.deleteOrphanTournament) {
      await deleteTournament(event.tournamentId, db);
      deletedTournament = true;
    }
  }

  return {
    tournamentId: event.tournamentId,
    remainingWindows,
    promotedPrimaryId,
    deletedTournament,
  };
}

/**
 * Check if all events for a sports season are complete
 */
export async function areAllEventsComplete(
  sportsSeasonId: string,
  providedDb?: ReturnType<typeof database>
): Promise<boolean> {
  const db = providedDb || database();

  const incompleteEvents = await getIncompleteScoringEvents(sportsSeasonId, db);
  return incompleteEvents.length === 0;
}

/**
 * Get upcoming (not yet complete) scoring events for a sports season,
 * ordered by effective start date ascending (soonest first).
 *
 * Effective date = min(eventDate, eventStartsAt, earliest future bracket-game scheduledAt).
 * This ensures CS2 Champions Stage events (which have game times set on
 * playoff_match_games but no eventDate on the event record) sort correctly.
 */
export async function getUpcomingScoringEvents(
  sportsSeasonId: string,
  limit = 5,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  // Over-fetch relative to the requested limit so the subsequent game-time
  // re-sort has enough candidates without an unbounded query.
  const events = await db.query.scoringEvents.findMany({
    where: and(
      eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
      eq(schema.scoringEvents.isComplete, false)
    ),
    orderBy: [asc(schema.scoringEvents.eventDate), asc(schema.scoringEvents.eventStartsAt), asc(schema.scoringEvents.createdAt)],
    limit: Math.max(limit * 5, 50),
  });

  if (events.length === 0) return [];

  // Find earliest upcoming game time per event from both bracket match games
  // and group stage matches (FIFA World Cup style).
  const eventIds = events.map((e) => e.id);
  const now = new Date();

  const [gameTimeRows, groupStageTimeRows] = await Promise.all([
    db
      .select({
        eventId: schema.scoringEvents.id,
        scheduledAt: schema.playoffMatchGames.scheduledAt,
      })
      .from(schema.scoringEvents)
      .innerJoin(
        schema.playoffMatches,
        eq(schema.playoffMatches.scoringEventId, schema.scoringEvents.id)
      )
      .innerJoin(
        schema.playoffMatchGames,
        eq(schema.playoffMatchGames.playoffMatchId, schema.playoffMatches.id)
      )
      .where(
        and(
          inArray(schema.scoringEvents.id, eventIds),
          isNotNull(schema.playoffMatchGames.scheduledAt),
          gte(schema.playoffMatchGames.scheduledAt, now)
        )
      ),
    db
      .select({
        eventId: schema.tournamentGroups.scoringEventId,
        scheduledAt: schema.groupStageMatches.scheduledAt,
      })
      .from(schema.groupStageMatches)
      .innerJoin(
        schema.tournamentGroups,
        eq(schema.groupStageMatches.tournamentGroupId, schema.tournamentGroups.id)
      )
      .where(
        and(
          inArray(schema.tournamentGroups.scoringEventId, eventIds),
          isNotNull(schema.groupStageMatches.scheduledAt),
          gte(schema.groupStageMatches.scheduledAt, now)
        )
      ),
  ]);

  const earliestGameById = new Map<string, Date>();
  for (const row of [...gameTimeRows, ...groupStageTimeRows]) {
    if (!row.scheduledAt) continue;
    const prev = earliestGameById.get(row.eventId);
    if (!prev || row.scheduledAt < prev) {
      earliestGameById.set(row.eventId, row.scheduledAt);
    }
  }

  const getEffectiveMs = (e: (typeof events)[0]): number => {
    const candidates: number[] = [];
    if (e.eventDate) candidates.push(new Date(e.eventDate + "T00:00:00Z").getTime());
    if (e.eventStartsAt) candidates.push(e.eventStartsAt.getTime());
    const game = earliestGameById.get(e.id);
    if (game) candidates.push(game.getTime());
    return candidates.length > 0 ? Math.min(...candidates) : Infinity;
  };

  return events
    .toSorted((a, b) => getEffectiveMs(a) - getEffectiveMs(b))
    .slice(0, limit)
    .map((e) => ({
      ...e,
      earliestGameTime: earliestGameById.get(e.id)?.toISOString()
        ?? e.eventStartsAt?.toISOString()
        ?? null,
    }));
}

/**
 * Get the single next upcoming event for a sports season (for card display).
 */
export async function getNextScoringEvent(
  sportsSeasonId: string,
  providedDb?: ReturnType<typeof database>
) {
  const upcoming = await getUpcomingScoringEvents(sportsSeasonId, 1, providedDb);
  return upcoming[0] || null;
}

/**
 * Get recently completed scoring events for a sports season,
 * ordered by completedAt descending (most recent first).
 */
export async function getRecentCompletedEvents(
  sportsSeasonId: string,
  limit = 3,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  return db.query.scoringEvents.findMany({
    where: and(
      eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
      eq(schema.scoringEvents.isComplete, true)
    ),
    orderBy: [desc(schema.scoringEvents.completedAt), desc(schema.scoringEvents.eventDate)],
    limit,
  });
}

// Scoring patterns where each participant competes in every event.
// Valid scoringPatternEnum values: playoff_bracket | season_standings | qualifying_points
const ALL_COMPETE_PATTERNS = new Set(["season_standings", "qualifying_points"]);

export interface UpcomingParticipantEvent {
  id: string;
  /**
   * The actual scoring event database ID. For all-compete events this equals id;
   * for bracket events id is a composite key (eventId|matchId|gameNum) so this
   * separate field is needed to build event-detail page links.
   * null/undefined for group-stage match entries and legacy callers.
   */
  scoringEventId?: string | null;
  name: string;
  eventDate: string | null;
  /**
   * Earliest scheduledAt timestamp (ISO string) across individual playoff match
   * games for this event — bracket sports only. Used when eventDate is null.
   */
  earliestGameTime: string | null;
  /**
   * e.g. "Team Spirit vs G2 Esports" — the bracket matchup, derived from
   * playoffMatches.participant1Id/participant2Id (or group-stage match
   * participants). Falls back to a round/game-number label (e.g. "Semifinals
   * Game #1") when neither participant's name resolves. null when unavailable
   * or redundant with event name.
   */
  matchLabel: string | null;
  eventType: string;
  sportsSeasonId: string;
  /** simulatorType from the parent sport — used to distinguish bracket-majors from manual-entry majors */
  simulatorType?: string | null;
  /** Only the current user's drafted participants involved in this event */
  relevantParticipants: Array<{ id: string; name: string }>;
}

/**
 * Get upcoming scoring events (within the given date window) that involve
 * at least one of the given drafted participants.
 *
 * - Bracket sports (playoff_bracket, ucl_bracket): only events where a
 *   participant appears in a playoff match.
 * - All-compete sports (season_standings, qualifying_points, etc.): every
 *   upcoming event; all draftedParticipants are attached.
 *
 * Events without a date or that are already complete are excluded.
 */
export async function getUpcomingEventsForDraftedParticipants(
  sportsSeasonId: string,
  scoringPattern: string,
  draftedParticipants: Array<{ id: string; name: string }>,
  dateFromStr: string,
  dateToStr: string,
  providedDb?: ReturnType<typeof database>
): Promise<UpcomingParticipantEvent[]> {
  if (draftedParticipants.length === 0) return [];

  const db = providedDb || database();
  const draftedIds = draftedParticipants.map((p) => p.id);
  const draftedMap = new Map(draftedParticipants.map((p) => [p.id, p]));

  // Timestamp bounds used by both all-compete and bracket paths below.
  const dateFromTimestampAllCompete = new Date(dateFromStr + "T00:00:00.000Z");
  const dateToTimestampAllCompete = new Date(dateToStr + "T23:59:59.999Z");

  if (ALL_COMPETE_PATTERNS.has(scoringPattern)) {
    // Primary: events with eventDate in the window.
    const eventsByDate = await db.query.scoringEvents.findMany({
      where: and(
        eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
        eq(schema.scoringEvents.isComplete, false),
        isNotNull(schema.scoringEvents.eventDate),
        gte(schema.scoringEvents.eventDate, dateFromStr),
        lte(schema.scoringEvents.eventDate, dateToStr)
      ),
      orderBy: [asc(schema.scoringEvents.eventDate)],
    });

    const foundByDateIds = new Set(eventsByDate.map((e) => e.id));

    // Secondary: events that have bracket game times within the window.
    // This catches CS2 Champions Stage bracket events whose eventDate is in
    // the past (or unset) but which have upcoming playoff_match_games scheduled.
    const gameTimeRows = await db
      .select({
        eventId: schema.scoringEvents.id,
        scheduledAt: schema.playoffMatchGames.scheduledAt,
      })
      .from(schema.scoringEvents)
      .innerJoin(
        schema.playoffMatches,
        eq(schema.playoffMatches.scoringEventId, schema.scoringEvents.id)
      )
      .innerJoin(
        schema.playoffMatchGames,
        eq(schema.playoffMatchGames.playoffMatchId, schema.playoffMatches.id)
      )
      .where(
        and(
          eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
          eq(schema.scoringEvents.isComplete, false),
          isNotNull(schema.playoffMatchGames.scheduledAt),
          gte(schema.playoffMatchGames.scheduledAt, dateFromTimestampAllCompete),
          lte(schema.playoffMatchGames.scheduledAt, dateToTimestampAllCompete)
        )
      );

    // Collect earliest game time per event; track which event IDs are new.
    const earliestGameTimeById = new Map<string, Date>();
    const extraEventIds = new Set<string>();
    for (const row of gameTimeRows) {
      if (!row.scheduledAt) continue;
      const prev = earliestGameTimeById.get(row.eventId);
      if (!prev || row.scheduledAt < prev) {
        earliestGameTimeById.set(row.eventId, row.scheduledAt);
      }
      if (!foundByDateIds.has(row.eventId)) {
        extraEventIds.add(row.eventId);
      }
    }

    // Fetch full event records for any extras not already in eventsByDate.
    let extraEvents: (typeof eventsByDate)[0][] = [];
    if (extraEventIds.size > 0) {
      extraEvents = await db.query.scoringEvents.findMany({
        where: inArray(schema.scoringEvents.id, [...extraEventIds]),
      });
    }

    // Merge and sort by effective start date (eventDate → eventStartsAt → game time).
    const allEvents = [...eventsByDate, ...extraEvents];
    const getEffectiveMs = (e: (typeof allEvents)[0]): number => {
      const candidates: number[] = [];
      if (e.eventDate) candidates.push(new Date(e.eventDate + "T00:00:00Z").getTime());
      if (e.eventStartsAt) candidates.push(e.eventStartsAt.getTime());
      const game = earliestGameTimeById.get(e.id);
      if (game) candidates.push(game.getTime());
      return candidates.length > 0 ? Math.min(...candidates) : Infinity;
    };
    allEvents.sort((a, b) => getEffectiveMs(a) - getEffectiveMs(b));

    return allEvents.map((e) => {
      const gameTime = earliestGameTimeById.get(e.id);
      return {
        id: e.id,
        scoringEventId: e.id,
        name: e.name,
        eventDate: e.eventDate,
        earliestGameTime: gameTime
          ? gameTime.toISOString()
          : e.eventStartsAt
          ? e.eventStartsAt.toISOString()
          : null,
        matchLabel: null,
        eventType: e.eventType,
        sportsSeasonId: e.sportsSeasonId,
        relevantParticipants: draftedParticipants,
      };
    });
  }

  // Bracket sports: join through playoff_matches → playoff_match_games to find relevant events.
  // scoringEvent.eventDate may be null — admins often set dates on individual games
  // (playoffMatchGames.scheduledAt) rather than on the event record itself.
  // We include an event if EITHER its eventDate OR any of its game scheduledAt timestamps
  // falls within the window.
  const dateFromTimestamp = dateFromTimestampAllCompete;
  const dateToTimestamp = dateToTimestampAllCompete;

  const rows = await db
    .selectDistinct({
      id: schema.scoringEvents.id,
      name: schema.scoringEvents.name,
      eventDate: schema.scoringEvents.eventDate,
      eventType: schema.scoringEvents.eventType,
      sportsSeasonId: schema.scoringEvents.sportsSeasonId,
      playoffMatchId: schema.playoffMatches.id,
      participant1Id: schema.playoffMatches.participant1Id,
      participant2Id: schema.playoffMatches.participant2Id,
      round: schema.playoffMatches.round,
      gameNumber: schema.playoffMatchGames.gameNumber,
      scheduledAt: schema.playoffMatchGames.scheduledAt,
    })
    .from(schema.scoringEvents)
    .innerJoin(
      schema.playoffMatches,
      eq(schema.playoffMatches.scoringEventId, schema.scoringEvents.id)
    )
    .leftJoin(
      schema.playoffMatchGames,
      eq(schema.playoffMatchGames.playoffMatchId, schema.playoffMatches.id)
    )
    .where(
      and(
        eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
        eq(schema.scoringEvents.isComplete, false),
        eq(schema.playoffMatches.isComplete, false),
        or(
          inArray(schema.playoffMatches.participant1Id, draftedIds),
          // participant2Id is nullable UUID — same underlying type as participant1Id;
          // the notNull difference only exists at the TypeScript layer
          // oxlint-disable-next-line typescript/no-explicit-any -- participant2Id is nullable UUID; notNull difference only exists at the TypeScript layer
          // eslint-disable-next-line @typescript-eslint/no-explicit-any
          inArray(schema.playoffMatches.participant2Id as any, draftedIds)
        ),
        or(
          // scoringEvent has an explicit date within the window
          and(
            isNotNull(schema.scoringEvents.eventDate),
            gte(schema.scoringEvents.eventDate, dateFromStr),
            lte(schema.scoringEvents.eventDate, dateToStr)
          ),
          // Or one of the individual games is scheduled within the window
          and(
            isNotNull(schema.playoffMatchGames.scheduledAt),
            gte(schema.playoffMatchGames.scheduledAt, dateFromTimestamp),
            lte(schema.playoffMatchGames.scheduledAt, dateToTimestamp)
          )
        )
      )
    )
    .orderBy(asc(schema.scoringEvents.eventDate));

  // Look up names for ALL participants in these matches (not just drafted
  // ones) so matchLabel can show the "P1 vs P2" matchup, mirroring the
  // group-stage matchLabel below. Run alongside the max-game-number lookup
  // below since neither depends on the other's result.
  const allMatchParticipantIds = [
    ...new Set(
      rows.flatMap((r) => [r.participant1Id, r.participant2Id]).filter((id): id is string => !!id)
    ),
  ];
  const eventIdsFromRows = [...new Set(rows.map((r) => r.id))];

  const [matchParticipantNameById, maxGameNumberByEvent] = await Promise.all([
    findParticipantNamesByIds(db, allMatchParticipantIds),
    (async () => {
      // Determine max game number per event across ALL games (not date-filtered)
      // so we can distinguish single-game matchups from multi-game series.
      const map = new Map<string, number>();
      if (eventIdsFromRows.length === 0) return map;

      const allGameRows = await db
        .selectDistinct({
          eventId: schema.scoringEvents.id,
          gameNumber: schema.playoffMatchGames.gameNumber,
        })
        .from(schema.scoringEvents)
        .innerJoin(
          schema.playoffMatches,
          eq(schema.playoffMatches.scoringEventId, schema.scoringEvents.id)
        )
        .innerJoin(
          schema.playoffMatchGames,
          eq(schema.playoffMatchGames.playoffMatchId, schema.playoffMatches.id)
        )
        .where(inArray(schema.scoringEvents.id, eventIdsFromRows));

      for (const row of allGameRows) {
        if (row.gameNumber !== null) {
          const current = map.get(row.eventId) ?? 0;
          map.set(row.eventId, Math.max(current, row.gameNumber));
        }
      }
      return map;
    })(),
  ]);

  // Group rows into calendar entries.
  // Series events (max game number > 1) get one entry per game so each game
  // appears as its own row on the calendar. Single-game events get one entry.
  const entryMap = new Map<string, UpcomingParticipantEvent>();
  const participantsByEntry = new Map<string, Map<string, { id: string; name: string }>>();
  const gameKeysByEntry = new Map<string, Set<string>>();
  const earliestTimeByEntry = new Map<string, Date>();
  const isSeriesByEntry = new Map<string, boolean>();
  const matchupIdsByEntry = new Map<string, { p1Id: string | null; p2Id: string | null }>();

  for (const row of rows) {
    const isSeries = (maxGameNumberByEvent.get(row.id) ?? 1) > 1;
    const entryKey =
      isSeries && row.gameNumber !== null
        ? `${row.id}|${row.playoffMatchId}|${row.gameNumber}`
        : `${row.id}|${row.playoffMatchId}`;

    if (!entryMap.has(entryKey)) {
      entryMap.set(entryKey, {
        id: entryKey,
        scoringEventId: row.id,
        name: row.name,
        eventDate: row.eventDate,
        earliestGameTime: null,
        matchLabel: null,
        eventType: row.eventType,
        sportsSeasonId: row.sportsSeasonId,
        relevantParticipants: [],
      });
      participantsByEntry.set(entryKey, new Map());
      gameKeysByEntry.set(entryKey, new Set());
      isSeriesByEntry.set(entryKey, isSeries);
      matchupIdsByEntry.set(entryKey, { p1Id: row.participant1Id, p2Id: row.participant2Id });
    }

    const pMap = participantsByEntry.get(entryKey);
    if (pMap) {
      if (row.participant1Id) {
        const p1 = draftedMap.get(row.participant1Id);
        if (p1) pMap.set(row.participant1Id, p1);
      }
      if (row.participant2Id) {
        const p2 = draftedMap.get(row.participant2Id);
        if (p2) pMap.set(row.participant2Id, p2);
      }
    }

    if (row.round && row.gameNumber !== null) {
      gameKeysByEntry.get(entryKey)?.add(`${row.round}|${row.gameNumber}`);
    }

    if (row.scheduledAt) {
      const prev = earliestTimeByEntry.get(entryKey);
      if (!prev || row.scheduledAt < prev) {
        earliestTimeByEntry.set(entryKey, row.scheduledAt);
      }
    }
  }

  for (const [entryKey, event] of entryMap) {
    event.relevantParticipants = Array.from(participantsByEntry.get(entryKey)?.values() ?? []);

    const earliest = earliestTimeByEntry.get(entryKey);
    event.earliestGameTime = earliest ? earliest.toISOString() : null;

    const isSeries = isSeriesByEntry.get(entryKey) ?? false;
    const gameKeys = gameKeysByEntry.get(entryKey) ?? new Set<string>();

    // matchLabel shows the "P1 vs P2" matchup whenever either participant's
    // name is known — the round/game-number info is intentionally NOT
    // included (the event name + sport already give that context); it's
    // only used as a last-resort fallback when no participant name resolved
    // at all (e.g. a deleted/orphaned participant row).
    const matchupIds = matchupIdsByEntry.get(entryKey);
    const p1Name = matchupIds?.p1Id ? matchParticipantNameById.get(matchupIds.p1Id) : undefined;
    const p2Name = matchupIds?.p2Id ? matchParticipantNameById.get(matchupIds.p2Id) : undefined;
    const matchupLabel = p1Name || p2Name ? `${p1Name ?? "?"} vs ${p2Name ?? "?"}` : null;

    let roundLabel: string | null = null;
    if (isSeries) {
      if (gameKeys.size >= 1) {
        const [round, gameNumberStr] = [...gameKeys][0].split("|");
        roundLabel =
          round === event.name ? `Game #${gameNumberStr}` : `${round} Game #${gameNumberStr}`;
      }
    } else {
      // Single-game: omit the game number, just show the round name.
      if (gameKeys.size === 1) {
        const [round] = [...gameKeys][0].split("|");
        roundLabel = round === event.name ? null : round;
      } else if (gameKeys.size > 1) {
        const rounds = new Set([...gameKeys].map((k) => k.split("|")[0]));
        if (rounds.size === 1) {
          const round = [...rounds][0];
          roundLabel = round === event.name ? null : round;
        }
      }
    }

    event.matchLabel = matchupLabel ?? roundLabel;
  }

  const bracketResults = Array.from(entryMap.values());

  // Also include group stage matches for the drafted participants.
  // Group stage matches live in groupStageMatches, not playoffMatches, so
  // the bracket query above misses them entirely.
  const groupStageRows = await db
    .select({
      matchId: schema.groupStageMatches.id,
      groupName: schema.tournamentGroups.groupName,
      scoringEventName: schema.scoringEvents.name,
      sportsSeasonId: schema.scoringEvents.sportsSeasonId,
      scheduledAt: schema.groupStageMatches.scheduledAt,
      participant1Id: schema.groupStageMatches.participant1Id,
      participant2Id: schema.groupStageMatches.participant2Id,
    })
    .from(schema.groupStageMatches)
    .innerJoin(
      schema.tournamentGroups,
      eq(schema.groupStageMatches.tournamentGroupId, schema.tournamentGroups.id)
    )
    .innerJoin(
      schema.scoringEvents,
      eq(schema.tournamentGroups.scoringEventId, schema.scoringEvents.id)
    )
    .where(
      and(
        eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
        eq(schema.groupStageMatches.isComplete, false),
        or(
          inArray(schema.groupStageMatches.participant1Id, draftedIds),
          inArray(schema.groupStageMatches.participant2Id, draftedIds)
        ),
        isNotNull(schema.groupStageMatches.scheduledAt),
        gte(schema.groupStageMatches.scheduledAt, dateFromTimestamp),
        lte(schema.groupStageMatches.scheduledAt, dateToTimestamp)
      )
    )
    .orderBy(asc(schema.groupStageMatches.scheduledAt));

  if (groupStageRows.length > 0) {
    const allGroupParticipantIds = [
      ...new Set(groupStageRows.flatMap((r) => [r.participant1Id, r.participant2Id])),
    ];
    const groupParticipantRows = await db.query.seasonParticipants.findMany({
      where: inArray(schema.seasonParticipants.id, allGroupParticipantIds),
    });
    const groupParticipantMap = new Map(groupParticipantRows.map((p) => [p.id, p]));

    for (const row of groupStageRows) {
      if (!row.scheduledAt) continue;
      const p1 = groupParticipantMap.get(row.participant1Id);
      const p2 = groupParticipantMap.get(row.participant2Id);
      const relevantParticipants: Array<{ id: string; name: string }> = [];
      if (draftedIds.includes(row.participant1Id) && p1) {
        relevantParticipants.push({ id: row.participant1Id, name: p1.name });
      }
      if (draftedIds.includes(row.participant2Id) && p2) {
        relevantParticipants.push({ id: row.participant2Id, name: p2.name });
      }
      bracketResults.push({
        id: `group|${row.matchId}`,
        scoringEventId: null,
        name: row.scoringEventName,
        eventDate: null,
        earliestGameTime: row.scheduledAt.toISOString(),
        matchLabel: `Group ${row.groupName} — ${p1?.name ?? "?"} vs ${p2?.name ?? "?"}`,
        eventType: "group_stage_match",
        sportsSeasonId: row.sportsSeasonId,
        relevantParticipants,
      });
    }
  }

  return bracketResults;
}

export interface DashboardScoringEvent {
  id: string;
  name: string;
  eventDate: string | null;
  /** Resolved date for tab bucketing: eventDate if set, else earliest matched game date. */
  displayDate: string | null;
  eventStartsAt: Date | null;
  eventType: string;
  isComplete: boolean;
  completedAt: Date | null;
  sportsSeasonId: string;
  sportsSeasonName: string;
  sportName: string;
  sportSlug: string | null;
}

/**
 * Get all scoring events (excluding schedule_event type) for the given dates,
 * joined with their sports season and sport info. Used for the admin dashboard
 * "Games to Score" widget.
 *
 * An event is included if EITHER its own eventDate falls on one of the given
 * dates, OR any of its playoffMatchGames has a scheduledAt timestamp on one of
 * those dates. This ensures bracket events where the admin set dates on
 * individual games (rather than the event itself) are still surfaced.
 */
export async function getEventsForDates(
  dates: string[],
  providedDb?: ReturnType<typeof database>
): Promise<DashboardScoringEvent[]> {
  if (dates.length === 0) return [];

  const db = providedDb || database();

  // Build timestamp bounds covering the full span of the requested dates so we
  // can range-check the playoffMatchGames.scheduledAt timestamp column.
  const sortedDates = [...dates].toSorted();
  const dateFromTimestamp = new Date(sortedDates[0] + "T00:00:00.000Z");
  const dateToTimestamp = new Date(sortedDates[sortedDates.length - 1] + "T23:59:59.999Z");

  // Step 1: collect event IDs where the event date OR any game's scheduledAt
  // falls within the requested dates. Also capture the matched date so we can
  // bucket events that have no eventDate (bracket events) into the right tab.
  const rows = await db
    .select({
      id: schema.scoringEvents.id,
      eventDate: schema.scoringEvents.eventDate,
      gameDate: sql<string | null>`DATE(${schema.playoffMatchGames.scheduledAt} AT TIME ZONE 'UTC')`,
    })
    .from(schema.scoringEvents)
    .leftJoin(
      schema.playoffMatches,
      eq(schema.playoffMatches.scoringEventId, schema.scoringEvents.id)
    )
    .leftJoin(
      schema.playoffMatchGames,
      eq(schema.playoffMatchGames.playoffMatchId, schema.playoffMatches.id)
    )
    .where(
      and(
        inArray(schema.scoringEvents.eventType, [
          "playoff_game",
          "major_tournament",
          "final_standings",
        ]),
        or(
          inArray(schema.scoringEvents.eventDate, dates),
          and(
            isNotNull(schema.playoffMatchGames.scheduledAt),
            gte(schema.playoffMatchGames.scheduledAt, dateFromTimestamp),
            lte(schema.playoffMatchGames.scheduledAt, dateToTimestamp)
          )
        )
      )
    );

  if (rows.length === 0) return [];

  // Collect ALL dates each event qualifies for. For bracket events, the
  // game's scheduledAt date (gameDate) takes priority over the event-level
  // eventDate — the event-level date might be set to the overall round date
  // (e.g. "April 5") while an individual game is actually scheduled today.
  // Using a Set per event also de-duplicates naturally when multiple matches
  // in the same bracket have games on the same day.
  const eventDatesMap = new Map<string, Set<string>>();
  for (const row of rows) {
    if (!eventDatesMap.has(row.id)) {
      eventDatesMap.set(row.id, new Set());
    }
    const dateSet = eventDatesMap.get(row.id);
    if (!dateSet) continue;
    if (row.eventDate && dates.includes(row.eventDate)) {
      dateSet.add(row.eventDate);
    }
    if (row.gameDate && dates.includes(row.gameDate)) {
      dateSet.add(row.gameDate);
    }
    // Fallback: row passed the WHERE clause so at least one date is relevant;
    // if neither mapped to a requested date (shouldn't happen), keep something.
    if (dateSet.size === 0) {
      const fallback = row.gameDate ?? row.eventDate ?? null;
      if (fallback) dateSet.add(fallback);
    }
  }
  const eventIds = [...eventDatesMap.keys()];

  // Step 2: fetch the matched events with sport season + sport info.
  const events = await db.query.scoringEvents.findMany({
    where: inArray(schema.scoringEvents.id, eventIds),
    orderBy: [
      asc(schema.scoringEvents.eventDate),
      asc(schema.scoringEvents.eventStartsAt),
      asc(schema.scoringEvents.createdAt),
    ],
    with: {
      sportsSeason: {
        with: {
          sport: true,
        },
      },
    },
  });

  // Return one entry per (event, date) pair so that an event with games on
  // both today and tomorrow appears in both tabs of the dashboard widget.
  return events.flatMap((e) => {
    const matchingDates = [...(eventDatesMap.get(e.id) ?? [])].toSorted();
    const base = {
      id: e.id,
      name: e.name,
      eventDate: e.eventDate,
      eventStartsAt: e.eventStartsAt,
      eventType: e.eventType,
      isComplete: e.isComplete,
      completedAt: e.completedAt,
      sportsSeasonId: e.sportsSeasonId,
      sportsSeasonName: e.sportsSeason.name,
      sportName: e.sportsSeason.sport.name,
      sportSlug: e.sportsSeason.sport.slug,
    };
    if (matchingDates.length === 0) {
      return [{ ...base, displayDate: e.eventDate ?? null }];
    }
    return matchingDates.map((date) => ({ ...base, displayDate: date }));
  });
}

/**
 * Bulk create scoring events for a sports season.
 * Returns created events in order.
 */
export async function bulkCreateScoringEvents(
  sportsSeasonId: string,
  events: Array<{ name: string; eventDate?: Date; eventStartsAt?: Date; eventType: EventType; isQualifyingEvent?: boolean; tournamentId?: string }>,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();

  if (events.length === 0) return [];

  const rows = events.map((e) => ({
    sportsSeasonId,
    name: e.name,
    eventDate: e.eventDate ? e.eventDate.toISOString().split("T")[0] : undefined,
    eventStartsAt: e.eventStartsAt,
    eventType: e.eventType,
    isQualifyingEvent: e.isQualifyingEvent ?? false,
    tournamentId: e.tournamentId,
    isComplete: false,
  }));

  return db.insert(schema.scoringEvents).values(rows).returning();
}

export async function getTournamentsBySportsSeason(sportsSeasonId: string) {
  const db = database();
  const rows = await db.query.scoringEvents.findMany({
    where: and(
      eq(schema.scoringEvents.sportsSeasonId, sportsSeasonId),
      isNotNull(schema.scoringEvents.tournamentId)
    ),
    with: { tournament: true },
  });
  const seen = new Set<string>();
  return rows.filter((r) => {
    if (!r.tournamentId || seen.has(r.tournamentId)) return false;
    seen.add(r.tournamentId);
    return true;
  });
}

export async function getSportsSeasonsByTournament(tournamentId: string) {
  const db = database();
  const rows = await db.query.scoringEvents.findMany({
    where: eq(schema.scoringEvents.tournamentId, tournamentId),
    with: { sportsSeason: { with: { sport: true } } },
  });
  const seen = new Set<string>();
  return rows.filter((r) => {
    if (seen.has(r.sportsSeasonId)) return false;
    seen.add(r.sportsSeasonId);
    return true;
  });
}

/**
 * The primary scoring event for a tournament — the single window where the admin
 * builds the bracket/stages and scoring happens; its results fan out to siblings.
 * Returns the explicitly-flagged primary, falling back to the earliest-created
 * linked event so callers (league/sim loaders) always have a structure source
 * even before a primary is designated.
 */
export async function getPrimaryEventForTournament(
  tournamentId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();
  const primary = await db.query.scoringEvents.findFirst({
    where: and(
      eq(schema.scoringEvents.tournamentId, tournamentId),
      eq(schema.scoringEvents.isPrimary, true)
    ),
  });
  if (primary) return primary;

  return db.query.scoringEvents.findFirst({
    where: eq(schema.scoringEvents.tournamentId, tournamentId),
    orderBy: asc(schema.scoringEvents.createdAt),
  });
}

/**
 * A tournament-linked, non-primary event is a read-only mirror: its results are
 * owned by the shared major's primary window and fan out to it. Direct scoring
 * on such an event must be rejected so windows can't diverge. Single source of
 * truth for that predicate, shared by the admin route guards and the loaders.
 */
export function isReadOnlySibling(event: {
  tournamentId: string | null;
  isPrimary: boolean;
}): boolean {
  return !!event.tournamentId && !event.isPrimary;
}

/**
 * Make `eventId` the single primary window for its tournament — set it primary
 * and clear the flag on every sibling. Used by the "Make this the primary
 * window" admin action and to seed a primary when the first bracket-major event
 * is created.
 */
export async function setPrimaryEvent(
  eventId: string,
  providedDb?: ReturnType<typeof database>
) {
  const db = providedDb || database();
  const event = await db.query.scoringEvents.findFirst({
    where: eq(schema.scoringEvents.id, eventId),
  });
  if (!event?.tournamentId) {
    throw new Error(`Event ${eventId} is not linked to a tournament`);
  }
  await db
    .update(schema.scoringEvents)
    .set({ isPrimary: false, updatedAt: new Date() })
    .where(eq(schema.scoringEvents.tournamentId, event.tournamentId));
  await db
    .update(schema.scoringEvents)
    .set({ isPrimary: true, updatedAt: new Date() })
    .where(eq(schema.scoringEvents.id, eventId));
}

/**
 * Designate `eventId` as the tournament's primary window only if none is set
 * yet. Idempotent: returns the existing primary's id when one already exists, so
 * creating/linking additional windows never steals primary from the first.
 */
export async function ensurePrimaryEvent(
  tournamentId: string,
  eventId: string,
  providedDb?: ReturnType<typeof database>
): Promise<string> {
  const db = providedDb || database();
  const existing = await db.query.scoringEvents.findFirst({
    where: and(
      eq(schema.scoringEvents.tournamentId, tournamentId),
      eq(schema.scoringEvents.isPrimary, true)
    ),
  });
  if (existing) return existing.id;
  await db
    .update(schema.scoringEvents)
    .set({ isPrimary: true, updatedAt: new Date() })
    .where(eq(schema.scoringEvents.id, eventId));
  return eventId;
}