import { describe, expect, it } from 'vitest'
import { parseMigrationVersion } from './migration-utils'
import dayjs from 'dayjs'

describe('parseMigrationVersion', () => {
  it('should parse valid migration version in YYYYMMDDHHmmss format', () => {
    const result = parseMigrationVersion('20231128095400')

    expect(result).not.toBeNull()
    expect(result?.isValid()).toBe(true)
    expect(result?.year()).toBe(2023)
    expect(result?.month()).toBe(10)
    expect(result?.date()).toBe(28)
    expect(result?.hour()).toBe(9)
    expect(result?.minute()).toBe(54)
    expect(result?.second()).toBe(0)
  })

  it('should return undefined for invalid version format like "001"', () => {
    const result = parseMigrationVersion('001')

    expect(result).toBeUndefined()
  })

  it('should return undefined for invalid version format like "002"', () => {
    const result = parseMigrationVersion('002')

    expect(result).toBeUndefined()
  })

  it('should return undefined for invalid version format like "003"', () => {
    const result = parseMigrationVersion('003')

    expect(result).toBeUndefined()
  })

  it('should return undefined for empty string', () => {
    const result = parseMigrationVersion('')

    expect(result).toBeUndefined()
  })

  it('should return undefined for random string', () => {
    const result = parseMigrationVersion('not-a-date')

    expect(result).toBeUndefined()
  })

  it('should return undefined for partial date format', () => {
    const result = parseMigrationVersion('20231128')

    expect(result).toBeUndefined()
  })

  it('should handle edge case date values that dayjs can parse', () => {
    // dayjs is lenient and will wrap invalid values to valid dates
    // This is acceptable for our use case - the main goal is to reject
    // non-date formats like "001", "002", etc.
    const result = parseMigrationVersion('20231399000000')

    expect(result).not.toBeNull()
    expect(result?.isValid()).toBe(true)
  })

  it('should allow chaining dayjs methods when valid', () => {
    const result = parseMigrationVersion('20231128095400')

    expect(result?.fromNow()).toBeDefined()
    expect(result?.toISOString()).toBeDefined()
    expect(result?.format('DD MMM YYYY')).toBe('28 Nov 2023')
  })
})