import { Month } from './month.vo'
import { DomainError } from '@/shared/exceptions'

describe('Month Value Object', () => {
  describe('create', () => {
    it('should create a valid month', () => {
      const month = Month.create('2024-01')
      expect(month.value).toBe('2024-01')
    })

    it('should throw error for invalid format', () => {
      expect(() => Month.create('2024-1')).toThrow(DomainError)
      expect(() => Month.create('2024/01')).toThrow(DomainError)
      expect(() => Month.create('202401')).toThrow(DomainError)
      expect(() => Month.create('invalid')).toThrow(DomainError)
    })
  })

  describe('current', () => {
    it('should return current month in YYYY-MM format', () => {
      const month = Month.current()
      expect(month.value).toMatch(/^\d{4}-\d{2}$/)
    })
  })

  describe('next', () => {
    it('should return next month', () => {
      const month = Month.create('2024-01')
      expect(month.next().value).toBe('2024-02')
    })

    it('should handle year transition', () => {
      const month = Month.create('2024-12')
      expect(month.next().value).toBe('2025-01')
    })
  })

  describe('previous', () => {
    it('should return previous month', () => {
      const month = Month.create('2024-02')
      expect(month.previous().value).toBe('2024-01')
    })

    it('should handle year transition', () => {
      const month = Month.create('2024-01')
      expect(month.previous().value).toBe('2023-12')
    })
  })

  describe('equals', () => {
    it('should return true for equal months', () => {
      const month1 = Month.create('2024-01')
      const month2 = Month.create('2024-01')
      expect(month1.equals(month2)).toBe(true)
    })

    it('should return false for different months', () => {
      const month1 = Month.create('2024-01')
      const month2 = Month.create('2024-02')
      expect(month1.equals(month2)).toBe(false)
    })
  })

  describe('isAfter/isBefore', () => {
    it('should compare months correctly', () => {
      const jan = Month.create('2024-01')
      const feb = Month.create('2024-02')

      expect(feb.isAfter(jan)).toBe(true)
      expect(jan.isBefore(feb)).toBe(true)
      expect(jan.isAfter(feb)).toBe(false)
      expect(feb.isBefore(jan)).toBe(false)
    })
  })

  describe('getYear/getMonth', () => {
    it('should extract year and month correctly', () => {
      const month = Month.create('2024-06')
      expect(month.getYear()).toBe(2024)
      expect(month.getMonth()).toBe(6)
    })
  })
})