import { database } from "~/database/context";
import * as schema from "~/database/schema";
import { eq, and, notInArray, desc, inArray } from "drizzle-orm";
import { getTeamQueue } from "./draft-queue";
import { isParticipantDrafted, getDraftPicksWithSports, getTeamDraftPicksWithSports } from "./draft-pick";
import { getParticipantsForSeasonWithSports } from "./participant";
import { getSeasonSportsSimple } from "./season-sport";
import { calculateDraftEligibility } from "~/lib/draft-eligibility";

/**
 * Auto-pick for a team when their timer runs out
 * 1. Check queue - pick first eligible item if available
 * 2. If queue empty, pick highest EV participant not drafted from eligible sports
 *
 * Updated to respect Omni league draft eligibility rules
 */
export async function autoPickForTeam(
  seasonId: string,
  teamId: string,
  draftRounds: number,
  allTeamIds: string[]
) {
  const db = database();

  // Calculate eligibility for this team
  const allPicks = await getDraftPicksWithSports(seasonId);
  const teamPicks = await getTeamDraftPicksWithSports(teamId, seasonId);
  const allParticipants = await getParticipantsForSeasonWithSports(seasonId);
  const seasonSports = await getSeasonSportsSimple(seasonId);
  const allTeams = allTeamIds.map((id) => ({ id }));

  const eligibility = calculateDraftEligibility(
    teamId,
    teamPicks,
    allPicks,
    allParticipants,
    seasonSports,
    draftRounds,
    allTeams
  );

  // Check queue first - filter by eligible sports
  const queue = await getTeamQueue(teamId);

  if (queue.length > 0) {
    // Get participant details for queue items to check sport eligibility
    const queueParticipantIds = queue.map((item) => item.participantId);
    const queueParticipants = await db.query.participants.findMany({
      where: inArray(schema.participants.id, queueParticipantIds),
      with: {
        sportsSeason: {
          with: {
            sport: true,
          },
        },
      },
    });

    // Try queue items in order, checking both drafted status and eligibility
    for (const item of queue) {
      const participant = queueParticipants.find((p) => p.id === item.participantId);
      if (!participant) continue;

      const sportId = participant.sportsSeason.sport.id;
      const isEligible = eligibility.eligibleSportIds.has(sportId);
      const isDrafted = await isParticipantDrafted(seasonId, item.participantId);

      if (!isDrafted && isEligible) {
        return item.participantId;
      }
    }
  }

  // Queue is empty or all queued players drafted/ineligible
  // Pick highest EV available from eligible sports
  return await getTopAvailableParticipant(seasonId, eligibility.eligibleSportIds);
}

/**
 * Get the highest EV participant that hasn't been drafted yet
 * Updated to filter by eligible sports
 */
export async function getTopAvailableParticipant(
  seasonId: string,
  eligibleSportIds?: Set<string>
) {
  const db = database();
  
  // Get all drafted participant IDs
  const draftedPicks = await db
    .select({ participantId: schema.draftPicks.participantId })
    .from(schema.draftPicks)
    .where(eq(schema.draftPicks.seasonId, seasonId));
  
  const draftedIds = draftedPicks.map((p: { participantId: string }) => p.participantId);
  
  // Get all participants from season sports, filtered by eligible sports if provided
  let seasonSportsData;
  if (eligibleSportIds && eligibleSportIds.size > 0) {
    // Filter to only eligible sports
    seasonSportsData = await db
      .select({
        sportsSeasonId: schema.seasonSports.sportsSeasonId,
        sportId: schema.sports.id,
      })
      .from(schema.seasonSports)
      .innerJoin(
        schema.sportsSeasons,
        eq(schema.seasonSports.sportsSeasonId, schema.sportsSeasons.id)
      )
      .innerJoin(
        schema.sports,
        eq(schema.sportsSeasons.sportId, schema.sports.id)
      )
      .where(eq(schema.seasonSports.seasonId, seasonId));

    // Filter to only eligible sports
    seasonSportsData = seasonSportsData.filter((s: { sportId: string }) =>
      eligibleSportIds.has(s.sportId)
    );
  } else {
    // No filtering - get all sports
    seasonSportsData = await db
      .select({ sportsSeasonId: schema.seasonSports.sportsSeasonId })
      .from(schema.seasonSports)
      .where(eq(schema.seasonSports.seasonId, seasonId));
  }

  const sportsSeasonIds = seasonSportsData.map(
    (s: { sportsSeasonId: string }) => s.sportsSeasonId
  );

  if (sportsSeasonIds.length === 0) {
    return null;
  }
  
  // Get top available participant by EV
  let query = db
    .select()
    .from(schema.participants)
    .where(eq(schema.participants.sportsSeasonId, sportsSeasonIds[0]))
    .orderBy(desc(schema.participants.expectedValue), schema.participants.name);
  
  // Filter out drafted participants if any exist
  if (draftedIds.length > 0) {
    query = db
      .select()
      .from(schema.participants)
      .where(
        and(
          eq(schema.participants.sportsSeasonId, sportsSeasonIds[0]),
          notInArray(schema.participants.id, draftedIds)
        )
      )
      .orderBy(desc(schema.participants.expectedValue), schema.participants.name);
  }
  
  // Handle multiple sports seasons
  if (sportsSeasonIds.length > 1) {
    // For simplicity, we'll query all and sort in memory
    // In production, might want to optimize this
    const allParticipants = [];
    
    for (const sportsSeasonId of sportsSeasonIds) {
      let participantQuery = db
        .select()
        .from(schema.participants)
        .where(eq(schema.participants.sportsSeasonId, sportsSeasonId));
      
      if (draftedIds.length > 0) {
        participantQuery = db
          .select()
          .from(schema.participants)
          .where(
            and(
              eq(schema.participants.sportsSeasonId, sportsSeasonId),
              notInArray(schema.participants.id, draftedIds)
            )
          );
      }
      
      const seasonParticipants = await participantQuery;
      allParticipants.push(...seasonParticipants);
    }
    
    // Sort by EV desc, then name
    allParticipants.sort((a, b) => {
      if (b.expectedValue !== a.expectedValue) {
        return b.expectedValue - a.expectedValue;
      }
      return a.name.localeCompare(b.name);
    });
    
    return allParticipants[0]?.id || null;
  }
  
  const [topParticipant] = await query;
  return topParticipant?.id || null;
}

/**
 * Calculate the current pick based on draft order and round
 */
export function calculatePickInfo(
  pickNumber: number,
  teamCount: number
): { round: number; pickInRound: number; teamIndex: number } {
  const round = Math.ceil(pickNumber / teamCount);
  const pickInRound = ((pickNumber - 1) % teamCount) + 1;
  
  // Snake draft: odd rounds go forward, even rounds go backward
  const isOddRound = round % 2 === 1;
  const teamIndex = isOddRound ? pickInRound - 1 : teamCount - pickInRound;
  
  return { round, pickInRound, teamIndex };
}

/**
 * Get the team ID for a given pick number based on draft order
 */
export function getTeamForPick(
  pickNumber: number,
  draftOrder: { teamId: string; draftOrder: number }[]
): string | null {
  const sortedOrder = [...draftOrder].sort((a, b) => a.draftOrder - b.draftOrder);
  const teamCount = sortedOrder.length;
  
  if (teamCount === 0) return null;
  
  const { teamIndex } = calculatePickInfo(pickNumber, teamCount);
  return sortedOrder[teamIndex]?.teamId || null;
}