import { getConfig, _getToken } from '@xuqm/rn-common'

export interface UploadResult {
  url: string
  thumbnailUrl: string | null
  hash: string
  size: number
  originalName: string
  mimeType: string
  ext?: string
}

/**
 * Upload a file to the file-service using multipart/form-data.
 * Optionally attach a pre-generated thumbnail (for video files).
 * Requires an active IM session (Bearer token) for authentication.
 */
export async function uploadFile(
  localUri: string,
  mimeType: string,
  filename: string,
  thumbnailUri?: string,
): Promise<UploadResult> {
  const config = getConfig()
  const token = await _getToken()
  if (!token) {
    throw new Error('[uploadFile] No active session — call ImSDK.login() first.')
  }

  const form = new FormData()

  // React Native FormData accepts an object with uri/name/type for file parts
  form.append('file', {
    uri: localUri,
    name: filename,
    type: mimeType,
  } as unknown as Blob)

  if (thumbnailUri) {
    form.append('thumbnail', {
      uri: thumbnailUri,
      name: 'thumbnail.jpg',
      type: 'image/jpeg',
    } as unknown as Blob)
  }

  if (config.debug) {
    console.debug('[XuqmSDK][Upload] request', {
      url: `${config.fileServiceUrl}/api/file/upload`,
      filename,
      mimeType,
      hasThumbnail: Boolean(thumbnailUri),
    })
  }

  const response = await fetch(`${config.fileServiceUrl}/api/file/upload`, {
    method: 'POST',
    headers: {
      Authorization: `Bearer ${token}`,
      // Do NOT set Content-Type — let fetch set it with the correct boundary
    },
    body: form,
  })

  if (!response.ok) {
    const text = await response.text().catch(() => '')
    if (config.debug) {
      console.debug('[XuqmSDK][Upload] response', {
        status: response.status,
        ok: false,
        body: text,
      })
    }
    throw new Error(`[uploadFile] Upload failed (${response.status}): ${text}`)
  }

  const json = await response.json()
  if (config.debug) {
    console.debug('[XuqmSDK][Upload] response', {
      status: response.status,
      ok: true,
    })
  }

  // Server wraps result in ApiResponse { code, data, message }
  const data = json?.data ?? json
  return {
    url:          data.url,
    thumbnailUrl: data.thumbnailUrl ?? null,
    hash:         data.hash,
    size:         data.size,
    originalName: data.originalName,
    mimeType:     data.mimeType,
    ext:          data.ext,
  }
}