// Import browser version otherwise electron-renderer will end up with node
// version and fail.
import { normaliseInput } from './files/normalise-input-multiple.browser.js'
import { modeToString } from './mode-to-string.js'
import type { MultipartRequest } from './multipart-request.js'
import type { ImportCandidateStream } from '../index.js'

export async function multipartRequest (source: ImportCandidateStream, abortController: AbortController, headers: Headers | Record<string, string> = {}, boundary?: string): Promise<MultipartRequest> {
  const parts = []
  const formData = new FormData()
  let index = 0
  let total = 0

  for await (const { content, path, mode, mtime } of normaliseInput(source)) {
    let fileSuffix = ''
    const type = content != null ? 'file' : 'dir'

    if (index > 0) {
      fileSuffix = `-${index}`
    }

    let fieldName = type + fileSuffix
    const qs = []

    if (mode !== null && mode !== undefined) {
      qs.push(`mode=${modeToString(mode)}`)
    }

    if ((mtime) != null) {
      const { secs, nsecs } = (mtime)

      qs.push(`mtime=${secs}`)

      if (nsecs != null) {
        qs.push(`mtime-nsecs=${nsecs}`)
      }
    }

    if (qs.length > 0) {
      fieldName = `${fieldName}?${qs.join('&')}`
    }

    if (content != null) {
      formData.set(fieldName, content, path != null ? encodeURIComponent(path) : undefined)
      const end = total + content.size
      parts.push({ name: path, start: total, end })
      total = end
    } else if (path != null) {
      formData.set(fieldName, new File([''], encodeURIComponent(path), { type: 'application/x-directory' }))
    } else {
      throw new Error('path or content or both must be set')
    }

    index++
  }

  return {
    total,
    parts,
    headers,
    body: formData
  }
}