import type { NextApiRequest, NextApiResponse } from 'next'
import { URL } from 'url'
import type { ProxyQueryParams } from './types'
import { parseFileFromMultipartRequest, safeUnlink } from './multipart'
import { makeRequestWithRedirects } from './proxyRequest'
import { handleProxyError } from './requestErrorResponse'
import { handleProxyResponse } from './responseFormatting'

export async function nip95UploadHandler(req: NextApiRequest, res: NextApiResponse): Promise<void> {
  if (req.method !== 'POST') {
    res.status(405).json({ error: 'Method not allowed' })
    return
  }

  const { targetEndpoint, authToken } = readProxyQueryParams(req)
  const currentUrl = new URL(targetEndpoint)

  const fileField = await parseFileFromMultipartRequest(req)
  if (!fileField) {
    res.status(400).json({ error: 'No file provided' })
    return
  }

  try {
    const response = await makeRequestWithRedirects({ targetEndpoint, url: currentUrl, file: fileField, authToken, redirectCount: 0, maxRedirects: 5 })
    handleProxyResponse({ res, response, targetEndpoint })
  } catch (error) {
    handleProxyError({ res, error, targetEndpoint, hostname: currentUrl.hostname, file: fileField })
  } finally {
    safeUnlink(fileField.filepath)
  }
}

function readProxyQueryParams(req: NextApiRequest): ProxyQueryParams {
  return { targetEndpoint: (req.query.endpoint as string) ?? 'https://void.cat/upload', authToken: req.query.auth as string | undefined }
}