/**
 * Integration Test: League Stats Data Flow
 * 
 * Tests the complete data flow from database to API response for league stats:
 * 1. Database query returns correct data
 * 2. Use case processes the data correctly
 * 3. Presenter transforms data to DTOs
 * 4. API returns correct response
 */

import { describe, it, expect, beforeAll, afterAll, beforeEach } from 'vitest';
import { IntegrationTestHarness, createTestHarness } from '../harness';

describe('League Stats - Data Flow Integration', () => {
  let harness: IntegrationTestHarness;

  beforeAll(async () => {
    harness = createTestHarness();
    await harness.beforeAll();
  }, 120000);

  afterAll(async () => {
    await harness.afterAll();
  }, 30000);

  beforeEach(async () => {
    await harness.beforeEach();
  });

  describe('API to View Data Flow', () => {
    it('should return correct stats DTO structure from API', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Stats Test League' });
      const season = await factory.createSeason(league.id.toString());
      
      // Create drivers
      const drivers = await Promise.all([
        factory.createDriver({ name: 'Driver 1', country: 'US' }),
        factory.createDriver({ name: 'Driver 2', country: 'UK' }),
        factory.createDriver({ name: 'Driver 3', country: 'CA' }),
      ]);

      // Create races
      const races = await Promise.all([
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Track 1',
          car: 'Car 1',
          scheduledAt: new Date(Date.now() - 21 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Track 2',
          car: 'Car 1',
          scheduledAt: new Date(Date.now() - 14 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Track 3',
          car: 'Car 1',
          scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
      ]);

      // Create results
      await factory.createResult(races[0].id.toString(), drivers[0].id.toString(), { position: 1, fastestLap: 90000, incidents: 0, startPosition: 1 });
      await factory.createResult(races[0].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 90500, incidents: 1, startPosition: 2 });
      await factory.createResult(races[0].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 91000, incidents: 2, startPosition: 3 });

      await factory.createResult(races[1].id.toString(), drivers[0].id.toString(), { position: 2, fastestLap: 89500, incidents: 1, startPosition: 2 });
      await factory.createResult(races[1].id.toString(), drivers[1].id.toString(), { position: 1, fastestLap: 89000, incidents: 0, startPosition: 3 });
      await factory.createResult(races[1].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 89500, incidents: 1, startPosition: 1 });

      await factory.createResult(races[2].id.toString(), drivers[0].id.toString(), { position: 3, fastestLap: 88500, incidents: 2, startPosition: 3 });
      await factory.createResult(races[2].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 88000, incidents: 1, startPosition: 1 });
      await factory.createResult(races[2].id.toString(), drivers[2].id.toString(), { position: 1, fastestLap: 87500, incidents: 0, startPosition: 2 });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      // Verify: API response structure
      expect(response).toBeDefined();
      expect(response).toHaveProperty('totalRaces');
      expect(response).toHaveProperty('totalDrivers');
      expect(response).toHaveProperty('totalResults');
      expect(response).toHaveProperty('averageIncidentsPerRace');
      expect(response).toHaveProperty('mostCommonTrack');
      expect(response).toHaveProperty('mostCommonCar');
      expect(response).toHaveProperty('topPerformers');
      expect(Array.isArray(response.topPerformers)).toBe(true);

      // Verify: Top performers structure
      for (const performer of response.topPerformers) {
        expect(performer).toHaveProperty('driverId');
        expect(performer).toHaveProperty('driver');
        expect(performer).toHaveProperty('points');
        expect(performer).toHaveProperty('wins');
        expect(performer).toHaveProperty('podiums');
        expect(performer).toHaveProperty('races');
      }
    });

    it('should return empty stats for league with no data', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Empty Stats League' });
      const season = await factory.createSeason(league.id.toString());

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      expect(response.totalRaces).toBe(0);
      expect(response.totalDrivers).toBe(0);
      expect(response.totalResults).toBe(0);
      expect(response.topPerformers).toEqual([]);
    });

    it('should handle stats with single race', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Single Race Stats League' });
      const season = await factory.createSeason(league.id.toString());
      
      const driver = await factory.createDriver({ name: 'Solo Driver', country: 'US' });
      const race = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'Monza',
        car: 'GT3',
        scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
        status: 'completed'
      });

      await factory.createResult(race.id.toString(), driver.id.toString(), { position: 1, fastestLap: 85000, incidents: 0, startPosition: 1 });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      expect(response.totalRaces).toBe(1);
      expect(response.totalDrivers).toBe(1);
      expect(response.totalResults).toBe(1);
      expect(response.topPerformers).toHaveLength(1);
      expect(response.topPerformers[0].driver.name).toBe('Solo Driver');
    });
  });

  describe('End-to-End Data Flow', () => {
    it('should correctly calculate stats from race results', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Calculation Stats League' });
      const season = await factory.createSeason(league.id.toString());
      
      const drivers = await Promise.all([
        factory.createDriver({ name: 'Driver A', iracingId: '1001' }),
        factory.createDriver({ name: 'Driver B', iracingId: '1002' }),
        factory.createDriver({ name: 'Driver C', iracingId: '1003' }),
      ]);

      // Create 5 races with different tracks and cars
      const races = await Promise.all([
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Laguna Seca',
          car: 'Formula Ford',
          scheduledAt: new Date(Date.now() - 35 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Road Atlanta',
          car: 'Formula Ford',
          scheduledAt: new Date(Date.now() - 28 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Laguna Seca',
          car: 'Formula Ford',
          scheduledAt: new Date(Date.now() - 21 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Nürburgring',
          car: 'GT3',
          scheduledAt: new Date(Date.now() - 14 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
        factory.createRace({ 
          leagueId: league.id.toString(),
          track: 'Road Atlanta',
          car: 'GT3',
          scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
          status: 'completed'
        }),
      ]);

      // Create results with specific incidents
      // Race 1: Laguna Seca, Formula Ford
      await factory.createResult(races[0].id.toString(), drivers[0].id.toString(), { position: 1, fastestLap: 95000, incidents: 0, startPosition: 1 });
      await factory.createResult(races[0].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 95500, incidents: 1, startPosition: 2 });
      await factory.createResult(races[0].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 96000, incidents: 2, startPosition: 3 });

      // Race 2: Road Atlanta, Formula Ford
      await factory.createResult(races[1].id.toString(), drivers[0].id.toString(), { position: 2, fastestLap: 94500, incidents: 1, startPosition: 2 });
      await factory.createResult(races[1].id.toString(), drivers[1].id.toString(), { position: 1, fastestLap: 94000, incidents: 0, startPosition: 3 });
      await factory.createResult(races[1].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 95000, incidents: 1, startPosition: 1 });

      // Race 3: Laguna Seca, Formula Ford
      await factory.createResult(races[2].id.toString(), drivers[0].id.toString(), { position: 1, fastestLap: 93500, incidents: 0, startPosition: 1 });
      await factory.createResult(races[2].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 94000, incidents: 1, startPosition: 2 });
      await factory.createResult(races[2].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 94500, incidents: 2, startPosition: 3 });

      // Race 4: Nürburgring, GT3
      await factory.createResult(races[3].id.toString(), drivers[0].id.toString(), { position: 3, fastestLap: 92500, incidents: 2, startPosition: 3 });
      await factory.createResult(races[3].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 92000, incidents: 1, startPosition: 1 });
      await factory.createResult(races[3].id.toString(), drivers[2].id.toString(), { position: 1, fastestLap: 91500, incidents: 0, startPosition: 2 });

      // Race 5: Road Atlanta, GT3
      await factory.createResult(races[4].id.toString(), drivers[0].id.toString(), { position: 2, fastestLap: 91000, incidents: 1, startPosition: 2 });
      await factory.createResult(races[4].id.toString(), drivers[1].id.toString(), { position: 1, fastestLap: 90500, incidents: 0, startPosition: 3 });
      await factory.createResult(races[4].id.toString(), drivers[2].id.toString(), { position: 3, fastestLap: 91500, incidents: 1, startPosition: 1 });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      // Verify calculated stats
      expect(response.totalRaces).toBe(5);
      expect(response.totalDrivers).toBe(3);
      expect(response.totalResults).toBe(15);

      // Verify average incidents per race
      // Total incidents: 0+1+2 + 1+0+1 + 0+1+2 + 2+1+0 + 1+0+1 = 15
      // Average: 15 / 5 = 3
      expect(response.averageIncidentsPerRace).toBe(3);

      // Verify most common track (Laguna Seca appears 2 times, Road Atlanta 2 times, Nürburgring 1 time)
      // Should return one of the most common tracks
      expect(['Laguna Seca', 'Road Atlanta']).toContain(response.mostCommonTrack);

      // Verify most common car (Formula Ford appears 3 times, GT3 appears 2 times)
      expect(response.mostCommonCar).toBe('Formula Ford');

      // Verify top performers
      expect(response.topPerformers).toHaveLength(3);

      // Find drivers in response
      const performerA = response.topPerformers.find(p => p.driver.name === 'Driver A');
      const performerB = response.topPerformers.find(p => p.driver.name === 'Driver B');
      const performerC = response.topPerformers.find(p => p.driver.name === 'Driver C');

      expect(performerA).toBeDefined();
      expect(performerB).toBeDefined();
      expect(performerC).toBeDefined();

      // Verify race counts
      expect(performerA?.races).toBe(5);
      expect(performerB?.races).toBe(5);
      expect(performerC?.races).toBe(5);

      // Verify win counts
      expect(performerA?.wins).toBe(2); // Races 1 and 3
      expect(performerB?.wins).toBe(2); // Races 2 and 5
      expect(performerC?.wins).toBe(1); // Race 4

      // Verify podium counts
      expect(performerA?.podiums).toBe(5); // All races
      expect(performerB?.podiums).toBe(5); // All races
      expect(performerC?.podiums).toBe(5); // All races
    });

    it('should handle stats with varying race counts per driver', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Varying Races League' });
      const season = await factory.createSeason(league.id.toString());
      
      const drivers = await Promise.all([
        factory.createDriver({ name: 'Full Timer', iracingId: '2001' }),
        factory.createDriver({ name: 'Part Timer', iracingId: '2002' }),
        factory.createDriver({ name: 'One Race', iracingId: '2003' }),
      ]);

      // Create 5 races
      const races = await Promise.all([
        factory.createRace({ leagueId: league.id.toString(), track: 'Track 1', car: 'Car 1', scheduledAt: new Date(Date.now() - 35 * 24 * 60 * 60 * 1000), status: 'completed' }),
        factory.createRace({ leagueId: league.id.toString(), track: 'Track 2', car: 'Car 1', scheduledAt: new Date(Date.now() - 28 * 24 * 60 * 60 * 1000), status: 'completed' }),
        factory.createRace({ leagueId: league.id.toString(), track: 'Track 3', car: 'Car 1', scheduledAt: new Date(Date.now() - 21 * 24 * 60 * 60 * 1000), status: 'completed' }),
        factory.createRace({ leagueId: league.id.toString(), track: 'Track 4', car: 'Car 1', scheduledAt: new Date(Date.now() - 14 * 24 * 60 * 60 * 1000), status: 'completed' }),
        factory.createRace({ leagueId: league.id.toString(), track: 'Track 5', car: 'Car 1', scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000), status: 'completed' }),
      ]);

      // Full Timer: all 5 races
      for (let i = 0; i < 5; i++) {
        await factory.createResult(races[i].id.toString(), drivers[0].id.toString(), { position: 1, fastestLap: 90000 + i * 100, incidents: i % 2, startPosition: 1 });
      }

      // Part Timer: 3 races (1, 2, 4)
      await factory.createResult(races[0].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 90500, incidents: 1, startPosition: 2 });
      await factory.createResult(races[1].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 90600, incidents: 1, startPosition: 2 });
      await factory.createResult(races[3].id.toString(), drivers[1].id.toString(), { position: 2, fastestLap: 90800, incidents: 1, startPosition: 2 });

      // One Race: only race 5
      await factory.createResult(races[4].id.toString(), drivers[2].id.toString(), { position: 2, fastestLap: 90900, incidents: 0, startPosition: 2 });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      expect(response.totalRaces).toBe(5);
      expect(response.totalDrivers).toBe(3);
      expect(response.totalResults).toBe(9); // 5 + 3 + 1

      // Verify top performers have correct race counts
      const fullTimer = response.topPerformers.find(p => p.driver.name === 'Full Timer');
      const partTimer = response.topPerformers.find(p => p.driver.name === 'Part Timer');
      const oneRace = response.topPerformers.find(p => p.driver.name === 'One Race');

      expect(fullTimer?.races).toBe(5);
      expect(partTimer?.races).toBe(3);
      expect(oneRace?.races).toBe(1);
    });
  });

  describe('Data Consistency', () => {
    it('should maintain data consistency across multiple API calls', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Consistency Stats League' });
      const season = await factory.createSeason(league.id.toString());
      
      const driver = await factory.createDriver({ name: 'Consistent Driver', country: 'DE' });
      const race = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'Nürburgring',
        car: 'GT3',
        scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
        status: 'completed'
      });

      await factory.createResult(race.id.toString(), driver.id.toString(), { position: 1, fastestLap: 85000, incidents: 0, startPosition: 1 });

      const api = harness.getApi();
      
      // Make multiple calls
      const response1 = await api.get(`/leagues/${league.id}/stats`);
      const response2 = await api.get(`/leagues/${league.id}/stats`);
      const response3 = await api.get(`/leagues/${league.id}/stats`);

      // All responses should be identical
      expect(response1).toEqual(response2);
      expect(response2).toEqual(response3);

      // Verify data integrity
      expect(response1.totalRaces).toBe(1);
      expect(response1.totalDrivers).toBe(1);
      expect(response1.totalResults).toBe(1);
      expect(response1.topPerformers).toHaveLength(1);
      expect(response1.topPerformers[0].driver.name).toBe('Consistent Driver');
    });

    it('should handle edge case: league with many races and drivers', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Large Stats League' });
      const season = await factory.createSeason(league.id.toString());

      // Create 10 drivers
      const drivers = await Promise.all(
        Array.from({ length: 10 }, (_, i) => 
          factory.createDriver({ name: `Driver ${i + 1}`, iracingId: `${3000 + i}` })
        )
      );

      // Create 10 races
      const races = await Promise.all(
        Array.from({ length: 10 }, (_, i) => 
          factory.createRace({ 
            leagueId: league.id.toString(),
            track: `Track ${i + 1}`,
            car: 'GT3',
            scheduledAt: new Date(Date.now() - (10 - i) * 24 * 60 * 60 * 1000),
            status: 'completed'
          })
        )
      );

      // Create results for each race (all drivers participate)
      for (let raceIndex = 0; raceIndex < 10; raceIndex++) {
        for (let driverIndex = 0; driverIndex < 10; driverIndex++) {
          const position = ((driverIndex + raceIndex) % 10) + 1;
          await factory.createResult(
            races[raceIndex].id.toString(),
            drivers[driverIndex].id.toString(),
            { 
              position, 
              fastestLap: 85000 + (position * 100), 
              incidents: position % 3, 
              startPosition: position 
            }
          );
        }
      }

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      // Should have correct totals
      expect(response.totalRaces).toBe(10);
      expect(response.totalDrivers).toBe(10);
      expect(response.totalResults).toBe(100); // 10 races * 10 drivers

      // Should have 10 top performers (one per driver)
      expect(response.topPerformers).toHaveLength(10);

      // All top performers should have 10 races
      for (const performer of response.topPerformers) {
        expect(performer.races).toBe(10);
        expect(performer.driver).toBeDefined();
        expect(performer.driver.id).toBeDefined();
        expect(performer.driver.name).toBeDefined();
      }
    });

    it('should handle edge case: league with no completed races', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'No Completed Races League' });
      const season = await factory.createSeason(league.id.toString());
      
      const driver = await factory.createDriver({ name: 'Waiting Driver', country: 'US' });
      
      // Create only scheduled races (no completed races)
      const race = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'Future Track',
        car: 'Future Car',
        scheduledAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
        status: 'scheduled'
      });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      // Should have 0 stats since no completed races
      expect(response.totalRaces).toBe(0);
      expect(response.totalDrivers).toBe(0);
      expect(response.totalResults).toBe(0);
      expect(response.topPerformers).toEqual([]);
    });

    it('should handle edge case: league with mixed race statuses', async () => {
      const factory = harness.getFactory();
      const league = await factory.createLeague({ name: 'Mixed Status League' });
      const season = await factory.createSeason(league.id.toString());
      
      const driver = await factory.createDriver({ name: 'Mixed Driver', country: 'US' });
      
      // Create races with different statuses
      const completedRace = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'Completed Track',
        car: 'Completed Car',
        scheduledAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000),
        status: 'completed'
      });

      const scheduledRace = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'Scheduled Track',
        car: 'Scheduled Car',
        scheduledAt: new Date(Date.now() + 7 * 24 * 60 * 60 * 1000),
        status: 'scheduled'
      });

      const inProgressRace = await factory.createRace({ 
        leagueId: league.id.toString(),
        track: 'In Progress Track',
        car: 'In Progress Car',
        scheduledAt: new Date(Date.now() - 1 * 24 * 60 * 60 * 1000),
        status: 'in_progress'
      });

      // Add result only to completed race
      await factory.createResult(completedRace.id.toString(), driver.id.toString(), { position: 1, fastestLap: 85000, incidents: 0, startPosition: 1 });

      const api = harness.getApi();
      const response = await api.get(`/leagues/${league.id}/stats`);

      // Should only count completed races
      expect(response.totalRaces).toBe(1);
      expect(response.totalDrivers).toBe(1);
      expect(response.totalResults).toBe(1);
      expect(response.topPerformers).toHaveLength(1);
      expect(response.topPerformers[0].driver.name).toBe('Mixed Driver');
    });
  });
});