import { describe, it, expect } from 'vitest'

describe('env helpers', () => {
  it('uses default value when env var is missing', () => {
    delete process.env.TEST_VAR_UNIQUE
    const env = (key: string, defaultValue?: string): string => {
      const value = process.env[key]
      if (value === undefined || value === '') {
        if (defaultValue !== undefined) return defaultValue
        throw new Error(`Missing ${key}`)
      }
      return value
    }
    expect(env('TEST_VAR_UNIQUE', 'fallback')).toBe('fallback')
  })

  it('returns env value when present', () => {
    process.env.TEST_VAR_UNIQUE = 'value'
    const env = (key: string, defaultValue?: string): string => {
      const value = process.env[key]
      if (value === undefined || value === '') {
        if (defaultValue !== undefined) return defaultValue
        throw new Error(`Missing ${key}`)
      }
      return value
    }
    expect(env('TEST_VAR_UNIQUE')).toBe('value')
    delete process.env.TEST_VAR_UNIQUE
  })

  it('envInt parses integer', () => {
    process.env.TEST_INT = '42'
    const envInt = (key: string, defaultValue?: number): number => {
      const raw = process.env[key]
      if (raw === undefined || raw === '') {
        if (defaultValue !== undefined) return defaultValue
        throw new Error(`Missing ${key}`)
      }
      const parsed = parseInt(raw, 10)
      if (Number.isNaN(parsed)) throw new Error(`Invalid int ${key}`)
      return parsed
    }
    expect(envInt('TEST_INT')).toBe(42)
    delete process.env.TEST_INT
  })

  it('envInt throws on NaN', () => {
    process.env.TEST_INT = 'abc'
    const envInt = (key: string, defaultValue?: number): number => {
      const raw = process.env[key]
      if (raw === undefined || raw === '') {
        if (defaultValue !== undefined) return defaultValue
        throw new Error(`Missing ${key}`)
      }
      const parsed = parseInt(raw, 10)
      if (Number.isNaN(parsed)) throw new Error(`Invalid int ${key}`)
      return parsed
    }
    expect(() => envInt('TEST_INT')).toThrow('Invalid int TEST_INT')
    delete process.env.TEST_INT
  })
})