import { Test, TestingModule } from '@nestjs/testing';
import { getRepositoryToken } from '@nestjs/typeorm';
import { PricingCatalogService } from './pricing-catalog.service';
import { PricingRate } from './entities/pricing-rate.entity';
import { AddonRate } from './entities/addon-rate.entity';
import { OptionalServiceProfile } from './entities/optional-service-profile.entity';
import { OptionalServiceRate } from './entities/optional-service-rate.entity';
import {
  AppRuntime,
  BillingCycle,
  DatabaseType,
  OptionalService,
  PricingResourceType,
  ProductType,
} from '../common/enums';
import { OPTIONAL_SERVICE_DEPLOY_SPECS } from './pricing-catalog.constants';
import { CalculateCostDto } from './dto/billing.dto';

describe('PricingCatalogService', () => {
  let service: PricingCatalogService;

  const rateRepo = {
    find: jest.fn().mockResolvedValue([]),
    findOne: jest.fn().mockResolvedValue(null),
    save: jest.fn().mockImplementation((x) => Promise.resolve(x)),
    create: jest.fn().mockImplementation((x) => x),
  };

  const addonRepo = {
    find: jest.fn().mockResolvedValue([]),
    findOne: jest.fn().mockResolvedValue(null),
    save: jest.fn().mockImplementation((x) => Promise.resolve(x)),
    create: jest.fn().mockImplementation((x) => x),
  };

  const optionalProfileRepo = {
    find: jest.fn().mockResolvedValue([]),
    findOne: jest.fn().mockResolvedValue(null),
    save: jest.fn().mockImplementation((x) => Promise.resolve(x)),
    create: jest.fn().mockImplementation((x) => x),
  };

  const optionalRateRepo = {
    find: jest.fn().mockResolvedValue([]),
    findOne: jest.fn().mockResolvedValue(null),
    save: jest.fn().mockImplementation((x) => Promise.resolve(x)),
    create: jest.fn().mockImplementation((x) => x),
  };

  beforeEach(async () => {
    jest.clearAllMocks();
    const module: TestingModule = await Test.createTestingModule({
      providers: [
        PricingCatalogService,
        { provide: getRepositoryToken(PricingRate), useValue: rateRepo },
        { provide: getRepositoryToken(AddonRate), useValue: addonRepo },
        { provide: getRepositoryToken(OptionalServiceProfile), useValue: optionalProfileRepo },
        { provide: getRepositoryToken(OptionalServiceRate), useValue: optionalRateRepo },
      ],
    }).compile();

    service = module.get(PricingCatalogService);
  });

  const baseDto = (): CalculateCostDto => ({
    runtime: 'nodejs',
    databaseType: DatabaseType.NONE,
    cpuLimit: '500m',
    memoryLimit: '512Mi',
    replicas: 1,
  });

  const emptyOptional = () => ({ profiles: [], rates: [], customDomain: null });

  it('parses CPU millicores to cores', () => {
    expect(service.parseCpuToCores('500m')).toBe(0.5);
    expect(service.parseCpuToCores('2')).toBe(2);
  });

  it('parses memory Mi to decimal GB for proportional billing (500Mi = 0.5 GB)', () => {
    expect(service.parseMemoryToGb('500Mi')).toBe(0.5);
    expect(service.parseMemoryToGb('1000Mi')).toBe(1);
    expect(service.parseMemoryToGb('1Gi')).toBe(1);
  });

  it('bills memory proportional to decimal GB (500Mi at half the per-GB monthly rate)', () => {
    const rates = [
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.MEMORY_PER_GB,
        hourlyPrice: 0,
        monthlyPrice: 10_000,
        yearlyPrice: 0,
        isActive: true,
      },
    ] as PricingRate[];

    const dto = { ...baseDto(), memoryLimit: '500Mi' };
    const result = service.computeTotalsWithRates(dto, rates, emptyOptional());
    expect(result.monthly).toBe(5000);
  });

  it('computes CPU line with cycle-native prices (no conversion)', () => {
    const rates = [
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.CPU_PER_CORE,
        hourlyPrice: 100,
        monthlyPrice: 5000,
        yearlyPrice: 50000,
        isActive: true,
      },
    ] as PricingRate[];

    const result = service.computeTotalsWithRates(baseDto(), rates, emptyOptional());
    expect(result.hourly).toBe(50);
    expect(result.monthly).toBe(2500);
    expect(result.yearly).toBe(25000);
    expect(result.breakdown[0].label).toContain('CPU');
  });

  it('includes redis optional service only when enabled', () => {
    const profile = {
      service: OptionalService.REDIS,
      cpuLimit: OPTIONAL_SERVICE_DEPLOY_SPECS[OptionalService.REDIS].cpuLimit,
      memoryLimit: '256Mi',
      storageGi: 0,
    } as OptionalServiceProfile;

    const rates = [
      {
        service: OptionalService.REDIS,
        resourceType: PricingResourceType.BASE_FEE,
        hourlyPrice: 10,
        monthlyPrice: 100,
        yearlyPrice: 1000,
        isActive: true,
      },
    ] as OptionalServiceRate[];

    const optional = { profiles: [profile], rates, customDomain: null };

    const without = service.computeTotalsWithRates(baseDto(), [], optional);
    expect(without.monthly).toBe(0);

    const withRedis = service.computeTotalsWithRates(
      { ...baseDto(), enableRedis: true },
      [],
      optional,
    );
    expect(withRedis.monthly).toBe(100);
    expect(withRedis.yearly).toBe(1000);
    expect(withRedis.hourly).toBe(10);
  });

  it('yearly deploy uses yearly column not monthly * 12', () => {
    const rates = [
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.BASE_FEE,
        hourlyPrice: 1,
        monthlyPrice: 100,
        yearlyPrice: 999,
        isActive: true,
      },
    ] as PricingRate[];

    const result = service.computeTotalsWithRates(baseDto(), rates, emptyOptional());
    expect(result.yearly).toBe(999);
    expect(result.monthly).toBe(100);
    expect(result.yearly).not.toBe(result.monthly * 12);
  });

  it('bills optional service CPU from profile and service rate matrix', () => {
    const profile = {
      service: OptionalService.REDIS,
      cpuLimit: OPTIONAL_SERVICE_DEPLOY_SPECS[OptionalService.REDIS].cpuLimit,
      memoryLimit: '256Mi',
      storageGi: 0,
    } as OptionalServiceProfile;

    const rates = [
      {
        service: OptionalService.REDIS,
        resourceType: PricingResourceType.CPU_PER_CORE,
        hourlyPrice: 1000,
        monthlyPrice: 0,
        yearlyPrice: 0,
        isActive: true,
      },
    ] as OptionalServiceRate[];

    const optional = { profiles: [profile], rates, customDomain: null };

    const without = service.computeTotalsWithRates(baseDto(), [], optional);
    const withRedis = service.computeTotalsWithRates(
      { ...baseDto(), enableRedis: true },
      [],
      optional,
    );

    expect(withRedis.hourly - without.hourly).toBe(200);
  });

  it('amountForCycleFromLine picks the correct column', () => {
    const line = { label: 'Test', hourly: 1, monthly: 2, yearly: 3 };
    expect(service.amountForCycleFromLine(line, BillingCycle.HOURLY)).toBe(1);
    expect(service.amountForCycleFromLine(line, BillingCycle.MONTHLY)).toBe(2);
    expect(service.amountForCycleFromLine(line, BillingCycle.YEARLY)).toBe(3);
  });

  it('managed_database bills database addon and resources without app base fee', () => {
    const rates = [
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.BASE_FEE,
        hourlyPrice: 999,
        monthlyPrice: 999,
        yearlyPrice: 999,
        isActive: true,
      },
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.DATABASE_ADDON,
        hourlyPrice: 0,
        monthlyPrice: 500,
        yearlyPrice: 0,
        isActive: true,
      },
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.STORAGE_PER_GB,
        hourlyPrice: 0,
        monthlyPrice: 100,
        yearlyPrice: 0,
        isActive: true,
      },
    ] as PricingRate[];

    const result = service.computeTotalsWithRates(
      {
        ...baseDto(),
        productType: ProductType.MANAGED_DATABASE,
        databaseType: DatabaseType.POSTGRESQL,
        replicas: 0,
        dbStorageSize: '2Gi',
        cpuLimit: '500m',
        memoryLimit: '512Mi',
      },
      rates,
      emptyOptional(),
    );
    expect(result.monthly).toBe(700);
    expect(result.breakdown.some((l) => l.label.includes('Base fee'))).toBe(false);
  });

  it('managed_redis bills only optional redis lines', () => {
    const profile = {
      service: OptionalService.REDIS,
      cpuLimit: OPTIONAL_SERVICE_DEPLOY_SPECS[OptionalService.REDIS].cpuLimit,
      memoryLimit: '256Mi',
      storageGi: 0,
    } as OptionalServiceProfile;

    const rates = [
      {
        service: OptionalService.REDIS,
        resourceType: PricingResourceType.BASE_FEE,
        hourlyPrice: 0,
        monthlyPrice: 250,
        yearlyPrice: 0,
        isActive: true,
      },
    ] as OptionalServiceRate[];

    const appRates = [
      {
        runtime: AppRuntime.NODEJS,
        resourceType: PricingResourceType.BASE_FEE,
        hourlyPrice: 999,
        monthlyPrice: 999,
        yearlyPrice: 999,
        isActive: true,
      },
    ] as PricingRate[];

    const result = service.computeTotalsWithRates(
      {
        ...baseDto(),
        productType: ProductType.MANAGED_REDIS,
        replicas: 0,
        enableRedis: true,
      },
      appRates,
      { profiles: [profile], rates, customDomain: null },
    );
    expect(result.monthly).toBe(250);
  });
});