import { describe, it, expect } from 'vitest';
import { DriverRankingsViewDataBuilder } from './DriverRankingsViewDataBuilder';
import type { DriverLeaderboardItemDTO } from '@/lib/types/generated/DriverLeaderboardItemDTO';

describe('DriverRankingsViewDataBuilder', () => {
  describe('happy paths', () => {
    it('should transform DriverLeaderboardItemDTO array to DriverRankingsViewData correctly', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
          avatarUrl: 'https://example.com/avatar1.jpg',
        },
        {
          id: 'driver-2',
          name: 'Jane Smith',
          rating: 1100.0,
          skillLevel: 'advanced',
          nationality: 'Canada',
          racesCompleted: 100,
          wins: 15,
          podiums: 40,
          isActive: true,
          rank: 2,
          avatarUrl: 'https://example.com/avatar2.jpg',
        },
        {
          id: 'driver-3',
          name: 'Bob Johnson',
          rating: 950.0,
          skillLevel: 'intermediate',
          nationality: 'UK',
          racesCompleted: 80,
          wins: 10,
          podiums: 30,
          isActive: true,
          rank: 3,
          avatarUrl: 'https://example.com/avatar3.jpg',
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      // Verify drivers
      expect(result.drivers).toHaveLength(3);
      expect(result.drivers[0].id).toBe('driver-1');
      expect(result.drivers[0].name).toBe('John Doe');
      expect(result.drivers[0].rating).toBe(1234.56);
      expect(result.drivers[0].skillLevel).toBe('pro');
      expect(result.drivers[0].nationality).toBe('USA');
      expect(result.drivers[0].racesCompleted).toBe(150);
      expect(result.drivers[0].wins).toBe(25);
      expect(result.drivers[0].podiums).toBe(60);
      expect(result.drivers[0].rank).toBe(1);
      expect(result.drivers[0].avatarUrl).toBe('https://example.com/avatar1.jpg');
      expect(result.drivers[0].winRate).toBe('16.7');
      expect(result.drivers[0].medalBg).toBe('bg-warning-amber');
      expect(result.drivers[0].medalColor).toBe('text-warning-amber');

      // Verify podium (top 3 with special ordering: 2nd, 1st, 3rd)
      expect(result.podium).toHaveLength(3);
      expect(result.podium[0].id).toBe('driver-1');
      expect(result.podium[0].name).toBe('John Doe');
      expect(result.podium[0].rating).toBe(1234.56);
      expect(result.podium[0].wins).toBe(25);
      expect(result.podium[0].podiums).toBe(60);
      expect(result.podium[0].avatarUrl).toBe('https://example.com/avatar1.jpg');
      expect(result.podium[0].position).toBe(2); // 2nd place

      expect(result.podium[1].id).toBe('driver-2');
      expect(result.podium[1].position).toBe(1); // 1st place

      expect(result.podium[2].id).toBe('driver-3');
      expect(result.podium[2].position).toBe(3); // 3rd place

      // Verify default values
      expect(result.searchQuery).toBe('');
      expect(result.selectedSkill).toBe('all');
      expect(result.sortBy).toBe('rank');
      expect(result.showFilters).toBe(false);
    });

    it('should handle empty driver array', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers).toEqual([]);
      expect(result.podium).toEqual([]);
      expect(result.searchQuery).toBe('');
      expect(result.selectedSkill).toBe('all');
      expect(result.sortBy).toBe('rank');
      expect(result.showFilters).toBe(false);
    });

    it('should handle less than 3 drivers for podium', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
          avatarUrl: 'https://example.com/avatar1.jpg',
        },
        {
          id: 'driver-2',
          name: 'Jane Smith',
          rating: 1100.0,
          skillLevel: 'advanced',
          nationality: 'Canada',
          racesCompleted: 100,
          wins: 15,
          podiums: 40,
          isActive: true,
          rank: 2,
          avatarUrl: 'https://example.com/avatar2.jpg',
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers).toHaveLength(2);
      expect(result.podium).toHaveLength(2);
      expect(result.podium[0].position).toBe(2); // 2nd place
      expect(result.podium[1].position).toBe(1); // 1st place
    });

    it('should handle missing avatar URLs with empty string fallback', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].avatarUrl).toBe('');
      expect(result.podium[0].avatarUrl).toBe('');
    });

    it('should calculate win rate correctly', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 100,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
        },
        {
          id: 'driver-2',
          name: 'Jane Smith',
          rating: 1100.0,
          skillLevel: 'advanced',
          nationality: 'Canada',
          racesCompleted: 50,
          wins: 10,
          podiums: 25,
          isActive: true,
          rank: 2,
        },
        {
          id: 'driver-3',
          name: 'Bob Johnson',
          rating: 950.0,
          skillLevel: 'intermediate',
          nationality: 'UK',
          racesCompleted: 0,
          wins: 0,
          podiums: 0,
          isActive: true,
          rank: 3,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].winRate).toBe('25.0');
      expect(result.drivers[1].winRate).toBe('20.0');
      expect(result.drivers[2].winRate).toBe('0.0');
    });

    it('should assign correct medal colors based on position', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
        },
        {
          id: 'driver-2',
          name: 'Jane Smith',
          rating: 1100.0,
          skillLevel: 'advanced',
          nationality: 'Canada',
          racesCompleted: 100,
          wins: 15,
          podiums: 40,
          isActive: true,
          rank: 2,
        },
        {
          id: 'driver-3',
          name: 'Bob Johnson',
          rating: 950.0,
          skillLevel: 'intermediate',
          nationality: 'UK',
          racesCompleted: 80,
          wins: 10,
          podiums: 30,
          isActive: true,
          rank: 3,
        },
        {
          id: 'driver-4',
          name: 'Alice Brown',
          rating: 800.0,
          skillLevel: 'beginner',
          nationality: 'Germany',
          racesCompleted: 60,
          wins: 5,
          podiums: 15,
          isActive: true,
          rank: 4,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].medalBg).toBe('bg-warning-amber');
      expect(result.drivers[0].medalColor).toBe('text-warning-amber');
      expect(result.drivers[1].medalBg).toBe('bg-gray-300');
      expect(result.drivers[1].medalColor).toBe('text-gray-300');
      expect(result.drivers[2].medalBg).toBe('bg-orange-700');
      expect(result.drivers[2].medalColor).toBe('text-orange-700');
      expect(result.drivers[3].medalBg).toBe('bg-gray-800');
      expect(result.drivers[3].medalColor).toBe('text-gray-400');
    });
  });

  describe('data transformation', () => {
    it('should preserve all DTO fields in the output', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-123',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
          avatarUrl: 'https://example.com/avatar.jpg',
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].name).toBe(driverDTOs[0].name);
      expect(result.drivers[0].nationality).toBe(driverDTOs[0].nationality);
      expect(result.drivers[0].avatarUrl).toBe(driverDTOs[0].avatarUrl);
      expect(result.drivers[0].skillLevel).toBe(driverDTOs[0].skillLevel);
    });

    it('should not modify the input DTO', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-123',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
          avatarUrl: 'https://example.com/avatar.jpg',
        },
      ];

      const originalDTO = JSON.parse(JSON.stringify(driverDTOs));
      DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(driverDTOs).toEqual(originalDTO);
    });

    it('should handle large numbers correctly', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 999999.99,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 10000,
          wins: 2500,
          podiums: 5000,
          isActive: true,
          rank: 1,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].rating).toBe(999999.99);
      expect(result.drivers[0].wins).toBe(2500);
      expect(result.drivers[0].podiums).toBe(5000);
      expect(result.drivers[0].racesCompleted).toBe(10000);
      expect(result.drivers[0].winRate).toBe('25.0');
    });
  });

  describe('edge cases', () => {
    it('should handle null/undefined avatar URLs', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
          avatarUrl: null as any,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].avatarUrl).toBe('');
      expect(result.podium[0].avatarUrl).toBe('');
    });

    it('should handle null/undefined rating', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: null as any,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 1,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].rating).toBeNull();
      expect(result.podium[0].rating).toBeNull();
    });

    it('should handle zero races completed for win rate calculation', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 0,
          wins: 0,
          podiums: 0,
          isActive: true,
          rank: 1,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].winRate).toBe('0.0');
    });

    it('should handle rank 0', () => {
      const driverDTOs: DriverLeaderboardItemDTO[] = [
        {
          id: 'driver-1',
          name: 'John Doe',
          rating: 1234.56,
          skillLevel: 'pro',
          nationality: 'USA',
          racesCompleted: 150,
          wins: 25,
          podiums: 60,
          isActive: true,
          rank: 0,
        },
      ];

      const result = DriverRankingsViewDataBuilder.build(driverDTOs);

      expect(result.drivers[0].rank).toBe(0);
      expect(result.drivers[0].medalBg).toBe('bg-gray-800');
      expect(result.drivers[0].medalColor).toBe('text-gray-400');
    });
  });
});