import { describe, it, expect } from 'vitest'
import {
  parseToWords,
  toCamelCase,
  toPascalCase,
  toSnakeCase,
  toKebabCase,
  toConstantCase,
} from '../../src/utils/variableName.js'

describe('variableName', () => {
  describe('parseToWords', () => {
    it('returns empty array for blank input', () => {
      expect(parseToWords('')).toEqual([])
      expect(parseToWords('   ')).toEqual([])
    })

    it('parses snake_case', () => {
      expect(parseToWords('hello_world')).toEqual(['hello', 'world'])
    })

    it('parses kebab-case', () => {
      expect(parseToWords('hello-world')).toEqual(['hello', 'world'])
    })

    it('parses camelCase', () => {
      expect(parseToWords('helloWorld')).toEqual(['hello', 'world'])
    })

    it('parses PascalCase', () => {
      expect(parseToWords('HelloWorld')).toEqual(['hello', 'world'])
    })

    it('parses consecutive uppercase (XMLHttpRequest)', () => {
      expect(parseToWords('XMLHttpRequest')).toEqual(['xml', 'http', 'request'])
    })

    it('parses numbers in identifiers', () => {
      expect(parseToWords('item2')).toEqual(['item', '2'])
      expect(parseToWords('temp2Detail')).toEqual(['temp', '2', 'detail'])
    })
  })

  describe('case conversions', () => {
    const words = ['hello', 'world']

    it('converts to camelCase', () => {
      expect(toCamelCase(words)).toBe('helloWorld')
      expect(toCamelCase([])).toBe('')
    })

    it('converts to PascalCase', () => {
      expect(toPascalCase(words)).toBe('HelloWorld')
    })

    it('converts to snake_case', () => {
      expect(toSnakeCase(words)).toBe('hello_world')
    })

    it('converts to kebab-case', () => {
      expect(toKebabCase(words)).toBe('hello-world')
    })

    it('converts to CONSTANT_CASE', () => {
      expect(toConstantCase(words)).toBe('HELLO_WORLD')
    })

    it('preserves numeric words in camelCase', () => {
      expect(toCamelCase(['item', '2'])).toBe('item2')
    })
  })
})