import { describe, it, expect, beforeEach } from 'vitest';

import { RecalculateChampionshipStandingsUseCase } from '@gridpilot/racing/application/use-cases/RecalculateChampionshipStandingsUseCase';
import type { ISeasonRepository } from '@gridpilot/racing/domain/repositories/ISeasonRepository';
import type { ILeagueScoringConfigRepository } from '@gridpilot/racing/domain/repositories/ILeagueScoringConfigRepository';
import type { IRaceRepository } from '@gridpilot/racing/domain/repositories/IRaceRepository';
import type { IResultRepository } from '@gridpilot/racing/domain/repositories/IResultRepository';
import type { IPenaltyRepository } from '@gridpilot/racing/domain/repositories/IPenaltyRepository';
import type { IChampionshipStandingRepository } from '@gridpilot/racing/domain/repositories/IChampionshipStandingRepository';

import type { Season } from '@gridpilot/racing/domain/entities/Season';
import type { LeagueScoringConfig } from '@gridpilot/racing/domain/entities/LeagueScoringConfig';
import type { Race } from '@gridpilot/racing/domain/entities/Race';
import type { Result } from '@gridpilot/racing/domain/entities/Result';
import type { Penalty } from '@gridpilot/racing/domain/entities/Penalty';
import type { ChampionshipStanding } from '@gridpilot/racing/domain/entities/ChampionshipStanding';
import type { ChampionshipConfig } from '@gridpilot/racing/domain/types/ChampionshipConfig';
import { EventScoringService } from '@gridpilot/racing/domain/services/EventScoringService';
import { DropScoreApplier } from '@gridpilot/racing/domain/services/DropScoreApplier';
import { ChampionshipAggregator } from '@gridpilot/racing/domain/services/ChampionshipAggregator';
import { PointsTable } from '@gridpilot/racing/domain/value-objects/PointsTable';
import type { SessionType } from '@gridpilot/racing/domain/types/SessionType';
import type { BonusRule } from '@gridpilot/racing/domain/types/BonusRule';
import type { DropScorePolicy } from '@gridpilot/racing/domain/types/DropScorePolicy';

class InMemorySeasonRepository implements ISeasonRepository {
  private seasons: Season[] = [];

  async findById(id: string): Promise<Season | null> {
    return this.seasons.find((s) => s.id === id) || null;
  }

  async findByLeagueId(leagueId: string): Promise<Season[]> {
    return this.seasons.filter((s) => s.leagueId === leagueId);
  }

  seedSeason(season: Season): void {
    this.seasons.push(season);
  }
}

class InMemoryLeagueScoringConfigRepository implements ILeagueScoringConfigRepository {
  private configs: LeagueScoringConfig[] = [];

  async findBySeasonId(seasonId: string): Promise<LeagueScoringConfig | null> {
    return this.configs.find((c) => c.seasonId === seasonId) || null;
  }

  seedConfig(config: LeagueScoringConfig): void {
    this.configs.push(config);
  }
}

class InMemoryRaceRepository implements IRaceRepository {
  private races: Race[] = [];

  async findById(id: string): Promise<Race | null> {
    return this.races.find((r) => r.id === id) || null;
  }

  async findAll(): Promise<Race[]> {
    return [...this.races];
  }

  async findByLeagueId(leagueId: string): Promise<Race[]> {
    return this.races.filter((r) => r.leagueId === leagueId);
  }

  async findUpcomingByLeagueId(): Promise<Race[]> {
    return [];
  }

  async findCompletedByLeagueId(): Promise<Race[]> {
    return [];
  }

  async findByStatus(): Promise<Race[]> {
    return [];
  }

  async findByDateRange(): Promise<Race[]> {
    return [];
  }

  async create(race: Race): Promise<Race> {
    this.races.push(race);
    return race;
  }

  async update(race: Race): Promise<Race> {
    const index = this.races.findIndex((r) => r.id === race.id);
    if (index >= 0) {
      this.races[index] = race;
    } else {
      this.races.push(race);
    }
    return race;
  }

  async delete(id: string): Promise<void> {
    this.races = this.races.filter((r) => r.id !== id);
  }

  async exists(id: string): Promise<boolean> {
    return this.races.some((r) => r.id === id);
  }

  seedRace(race: Race): void {
    this.races.push(race);
  }
}

class InMemoryResultRepository implements IResultRepository {
  private results: Result[] = [];

  async findByRaceId(raceId: string): Promise<Result[]> {
    return this.results.filter((r) => r.raceId === raceId);
  }

  seedResult(result: Result): void {
    this.results.push(result);
  }
}

class InMemoryPenaltyRepository implements IPenaltyRepository {
  private penalties: Penalty[] = [];

  async findByRaceId(raceId: string): Promise<Penalty[]> {
    return this.penalties.filter((p) => p.raceId === raceId);
  }

  async findByLeagueId(leagueId: string): Promise<Penalty[]> {
    return this.penalties.filter((p) => p.leagueId === leagueId);
  }

  async findByLeagueIdAndDriverId(
    leagueId: string,
    driverId: string,
  ): Promise<Penalty[]> {
    return this.penalties.filter(
      (p) => p.leagueId === leagueId && p.driverId === driverId,
    );
  }

  async findAll(): Promise<Penalty[]> {
    return [...this.penalties];
  }

  seedPenalty(penalty: Penalty): void {
    this.penalties.push(penalty);
  }
}

class InMemoryChampionshipStandingRepository implements IChampionshipStandingRepository {
  private standings: ChampionshipStanding[] = [];

  async findBySeasonAndChampionship(
    seasonId: string,
    championshipId: string,
  ): Promise<ChampionshipStanding[]> {
    return this.standings.filter(
      (s) => s.seasonId === seasonId && s.championshipId === championshipId,
    );
  }

  async saveAll(standings: ChampionshipStanding[]): Promise<void> {
    this.standings = standings;
  }

  getAll(): ChampionshipStanding[] {
    return [...this.standings];
  }
}

function makePointsTable(points: number[]): PointsTable {
  const byPos: Record<number, number> = {};
  points.forEach((p, idx) => {
    byPos[idx + 1] = p;
  });
  return new PointsTable(byPos);
}

function makeChampionshipConfig(): ChampionshipConfig {
  const mainPoints = makePointsTable([25, 18, 15, 12, 10, 8, 6, 4, 2, 1]);
  const sprintPoints = makePointsTable([8, 7, 6, 5, 4, 3, 2, 1]);

  const fastestLapBonus: BonusRule = {
    id: 'fastest-lap-main',
    type: 'fastestLap',
    points: 1,
    requiresFinishInTopN: 10,
  };

  const sessionTypes: SessionType[] = ['sprint', 'main'];
  const pointsTableBySessionType: Record<SessionType, PointsTable> = {
    sprint: sprintPoints,
    main: mainPoints,
    practice: new PointsTable({}),
    qualifying: new PointsTable({}),
    q1: new PointsTable({}),
    q2: new PointsTable({}),
    q3: new PointsTable({}),
    timeTrial: new PointsTable({}),
  };

  const bonusRulesBySessionType: Record<SessionType, BonusRule[]> = {
    sprint: [],
    main: [fastestLapBonus],
    practice: [],
    qualifying: [],
    q1: [],
    q2: [],
    q3: [],
    timeTrial: [],
  };

  const dropScorePolicy: DropScorePolicy = {
    strategy: 'bestNResults',
    count: 6,
  };

  return {
    id: 'driver-champ',
    name: 'Driver Championship',
    type: 'driver',
    sessionTypes,
    pointsTableBySessionType,
    bonusRulesBySessionType,
    dropScorePolicy,
  };
}

describe('RecalculateChampionshipStandingsUseCase', () => {
  const leagueId = 'league-1';
  const seasonId = 'season-1';
  const championshipId = 'driver-champ';

  let seasonRepository: InMemorySeasonRepository;
  let leagueScoringConfigRepository: InMemoryLeagueScoringConfigRepository;
  let raceRepository: InMemoryRaceRepository;
  let resultRepository: InMemoryResultRepository;
  let penaltyRepository: InMemoryPenaltyRepository;
  let championshipStandingRepository: InMemoryChampionshipStandingRepository;

  let useCase: RecalculateChampionshipStandingsUseCase;

  beforeEach(() => {
    seasonRepository = new InMemorySeasonRepository();
    leagueScoringConfigRepository = new InMemoryLeagueScoringConfigRepository();
    raceRepository = new InMemoryRaceRepository();
    resultRepository = new InMemoryResultRepository();
    penaltyRepository = new InMemoryPenaltyRepository();
    championshipStandingRepository = new InMemoryChampionshipStandingRepository();

    const eventScoringService = new EventScoringService();
    const dropScoreApplier = new DropScoreApplier();
    const championshipAggregator = new ChampionshipAggregator(dropScoreApplier);

    useCase = new RecalculateChampionshipStandingsUseCase(
      seasonRepository,
      leagueScoringConfigRepository,
      raceRepository,
      resultRepository,
      penaltyRepository,
      championshipStandingRepository,
      eventScoringService,
      championshipAggregator,
    );

    const season: Season = {
      id: seasonId,
      leagueId,
      gameId: 'iracing',
      name: 'Demo Season',
      status: 'active',
      year: 2025,
      order: 1,
      startDate: new Date('2025-01-01'),
      endDate: new Date('2025-12-31'),
    };

    seasonRepository.seedSeason(season);

    const championship = makeChampionshipConfig();

    const leagueScoringConfig: LeagueScoringConfig = {
      id: 'lsc-1',
      seasonId,
      championships: [championship],
    };

    leagueScoringConfigRepository.seedConfig(leagueScoringConfig);

    const races: Race[] = [
      {
        id: 'race-1-sprint',
        leagueId,
        scheduledAt: new Date('2025-02-01'),
        track: 'Track 1',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
      {
        id: 'race-1-main',
        leagueId,
        scheduledAt: new Date('2025-02-01'),
        track: 'Track 1',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
      {
        id: 'race-2-sprint',
        leagueId,
        scheduledAt: new Date('2025-03-01'),
        track: 'Track 2',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
      {
        id: 'race-2-main',
        leagueId,
        scheduledAt: new Date('2025-03-01'),
        track: 'Track 2',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
      {
        id: 'race-3-sprint',
        leagueId,
        scheduledAt: new Date('2025-04-01'),
        track: 'Track 3',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
      {
        id: 'race-3-main',
        leagueId,
        scheduledAt: new Date('2025-04-01'),
        track: 'Track 3',
        car: 'Car A',
        sessionType: 'race',
        status: 'completed',
      },
    ];

    races.forEach((race) => raceRepository.seedRace(race));

    const drivers = ['driver-1', 'driver-2', 'driver-3'];

    const resultsData: Array<{
      raceId: string;
      finishingOrder: string[];
      fastestLapDriverId: string;
    }> = [
      {
        raceId: 'race-1-sprint',
        finishingOrder: ['driver-1', 'driver-2', 'driver-3'],
        fastestLapDriverId: 'driver-2',
      },
      {
        raceId: 'race-1-main',
        finishingOrder: ['driver-2', 'driver-1', 'driver-3'],
        fastestLapDriverId: 'driver-1',
      },
      {
        raceId: 'race-2-sprint',
        finishingOrder: ['driver-1', 'driver-3', 'driver-2'],
        fastestLapDriverId: 'driver-1',
      },
      {
        raceId: 'race-2-main',
        finishingOrder: ['driver-1', 'driver-2', 'driver-3'],
        fastestLapDriverId: 'driver-1',
      },
      {
        raceId: 'race-3-sprint',
        finishingOrder: ['driver-2', 'driver-1', 'driver-3'],
        fastestLapDriverId: 'driver-2',
      },
      {
        raceId: 'race-3-main',
        finishingOrder: ['driver-3', 'driver-1', 'driver-2'],
        fastestLapDriverId: 'driver-3',
      },
    ];

    let resultIdCounter = 1;
    for (const raceData of resultsData) {
      raceData.finishingOrder.forEach((driverId, index) => {
        const result: Result = {
          id: `result-${resultIdCounter++}`,
          raceId: raceData.raceId,
          driverId,
          position: index + 1,
          fastestLap: driverId === raceData.fastestLapDriverId ? 90000 : 91000 + index * 100,
          incidents: 0,
          startPosition: index + 1,
        };
        resultRepository.seedResult(result);
      });
    }
  });

  it('recalculates standings for a driver championship with sprint and main races', async () => {
    const dto = await useCase.execute({
      seasonId,
      championshipId,
    });

    expect(dto.seasonId).toBe(seasonId);
    expect(dto.championshipId).toBe(championshipId);
    expect(dto.championshipName).toBe('Driver Championship');
    expect(dto.rows.length).toBeGreaterThan(0);

    const rows = dto.rows;
    const sorted = [...rows].sort((a, b) => b.totalPoints - a.totalPoints);
    expect(rows.map((r) => r.participant.id)).toEqual(
      sorted.map((r) => r.participant.id),
    );

    const leader = rows[0];
    expect(leader.resultsCounted).toBeLessThanOrEqual(6);
    expect(leader.resultsDropped).toBeGreaterThanOrEqual(0);
  });
});