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

describe('SponsorDashboardViewDataBuilder', () => {
  describe('happy paths', () => {
    it('should transform SponsorDashboardDTO to SponsorDashboardViewData correctly', () => {
      const apiDto: SponsorDashboardDTO = {
        sponsorName: 'Test Sponsor',
        metrics: {
          impressions: 5000,
          viewers: 1000,
          exposure: 500,
        },
        investment: {
          activeSponsorships: 5,
          totalSpent: 5000,
        },
        sponsorships: [],
      };

      const result = SponsorDashboardViewDataBuilder.build(apiDto);

      expect(result.sponsorName).toBe('Test Sponsor');
      expect(result.totalImpressions).toBe('5,000');
      expect(result.totalInvestment).toBe('$5,000.00');
      expect(result.activeSponsorships).toBe(5);
      expect(result.metrics.impressionsChange).toBe(15);
    });

    it('should handle low impressions correctly', () => {
      const apiDto: SponsorDashboardDTO = {
        sponsorName: 'Test Sponsor',
        metrics: {
          impressions: 500,
          viewers: 100,
          exposure: 50,
        },
        investment: {
          activeSponsorships: 1,
          totalSpent: 1000,
        },
        sponsorships: [],
      };

      const result = SponsorDashboardViewDataBuilder.build(apiDto);

      expect(result.metrics.impressionsChange).toBe(-5);
    });
  });

  describe('data transformation', () => {
    it('should preserve all DTO fields in the output', () => {
      const apiDto: SponsorDashboardDTO = {
        sponsorName: 'Test Sponsor',
        metrics: {
          impressions: 5000,
          viewers: 1000,
          exposure: 500,
        },
        investment: {
          activeSponsorships: 5,
          totalSpent: 5000,
        },
        sponsorships: [],
      };

      const result = SponsorDashboardViewDataBuilder.build(apiDto);

      expect(result.sponsorName).toBe(apiDto.sponsorName);
      expect(result.activeSponsorships).toBe(apiDto.investment.activeSponsorships);
    });

    it('should not modify the input DTO', () => {
      const apiDto: SponsorDashboardDTO = {
        sponsorName: 'Test Sponsor',
        metrics: {
          impressions: 5000,
          viewers: 1000,
          exposure: 500,
        },
        investment: {
          activeSponsorships: 5,
          totalSpent: 5000,
        },
        sponsorships: [],
      };

      const originalDto = JSON.parse(JSON.stringify(apiDto));
      SponsorDashboardViewDataBuilder.build(apiDto);

      expect(apiDto).toEqual(originalDto);
    });
  });
});