import { describe, it, expect, beforeEach, vi } from 'vitest'
import { createSpreadDownloadConfig } from './download'
import type { SpreadWidgetData } from './types'

const data: SpreadWidgetData = [
  {
    min: 1,
    max: 9,
    prefix: '$',
    suffix: 'k',
    note: 'q1',
    series: { name: 'Revenue' },
  },
  { min: 0, max: 10 },
]

let csvText = ''

beforeEach(() => {
  csvText = ''
  vi.spyOn(URL, 'createObjectURL').mockReturnValue('blob:mock')
  vi.spyOn(URL, 'revokeObjectURL').mockImplementation(() => undefined)
  const RealBlob = global.Blob
  vi.stubGlobal(
    'Blob',
    class extends RealBlob {
      constructor(parts: BlobPart[], opts?: BlobPropertyBag) {
        csvText = typeof parts[0] === 'string' ? parts[0] : ''
        super(parts, opts)
      }
    },
  )
})

describe('createSpreadDownloadConfig', () => {
  it('CSV-only by default', () => {
    expect(
      createSpreadDownloadConfig({ filename: 's', getData: () => data }).map(
        (i) => i.id,
      ),
    ).toEqual(['csv'])
  })

  it('prepends PNG when getCaptureEl is provided', () => {
    const items = createSpreadDownloadConfig({
      filename: 's',
      getData: () => data,
      getCaptureEl: () => document.createElement('div'),
    })
    expect(items.map((i) => i.id)).toEqual(['png', 'csv'])
  })

  it('CSV resolve emits one row per item with optional fields blanked', async () => {
    const items = createSpreadDownloadConfig({
      filename: 's',
      getData: () => data,
    })
    const handle = await items.find((i) => i.id === 'csv')!.resolve()
    expect(handle.filename).toBe('s.csv')
    expect(csvText).toBe(
      'series,prefix,min,max,suffix,note\nRevenue,$,1,9,k,q1\n,,0,10,,',
    )
  })
})