import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
import { saveCsv } from '@/shared/downloadCsv'

describe('saveCsv', () => {
  beforeEach(() => vi.stubGlobal('URL', { createObjectURL: vi.fn(), revokeObjectURL: vi.fn() }))
  afterEach(() => { vi.restoreAllMocks(); vi.unstubAllGlobals() })

  it('downloads the provided Blob with the requested file name and always revokes the URL', () => {
    const blob = new Blob(['id,status\n1,ACTIVE\n'], { type: 'text/csv;charset=UTF-8' })
    const createObjectURL = vi.mocked(URL.createObjectURL).mockReturnValue('blob:overseas-master-data')
    const revokeObjectURL = vi.mocked(URL.revokeObjectURL)
    const click = vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => undefined)

    saveCsv(blob, 'vehicles.csv')

    expect(createObjectURL).toHaveBeenCalledWith(blob)
    expect(click).toHaveBeenCalledOnce()
    expect(revokeObjectURL).toHaveBeenCalledWith('blob:overseas-master-data')
  })

  it('revokes the Blob URL even when the browser click fails', () => {
    vi.mocked(URL.createObjectURL).mockReturnValue('blob:failed-download')
    const revokeObjectURL = vi.mocked(URL.revokeObjectURL)
    vi.spyOn(HTMLAnchorElement.prototype, 'click').mockImplementation(() => { throw new Error('browser blocked') })

    expect(() => saveCsv(new Blob(['csv']), 'quotes.csv')).toThrow('browser blocked')
    expect(revokeObjectURL).toHaveBeenCalledWith('blob:failed-download')
  })
})