import { heyFetch, heyRequest, BASE } from './client.js'
import listBoxes from './boxes.js'

const JSON_HEADERS = { 'Content-Type': 'application/json' }

function topicIdFromMessage(message) {
  return message?.topic_id ?? message?.topicId ?? message?.topic?.id
}

async function resolveTopicId(input) {
  if (input?.topicId != null) return input.topicId
  const entryId = input?.entryId
  if (entryId == null) throw new Error('topicId or entryId is required')
  const message = await heyFetch(`/messages/${entryId}.json`)
  const topicId = topicIdFromMessage(message)
  if (topicId == null) throw new Error('message names no topic')
  return topicId
}

async function paperTrailBoxId() {
  const boxes = await listBoxes()
  const trail = (Array.isArray(boxes) ? boxes : []).find((box) => box?.kind === 'trailbox')
  if (trail?.id == null) throw new Error('HEY lists no Paper Trail box')
  return trail.id
}

/**
 * Move one HEY topic (thread) to the Paper Trail. Per topic only: it does
 * not change the sender's screening or where their other mail lands.
 *
 * Resolves the Paper Trail box from GET /boxes.json (kind `trailbox`), then
 * POSTs the official SDK MoveTopic body to /topics/{topicId}/moves.json.
 *
 * @param {{ topicId?: number|string, entryId?: number|string }} input
 * @returns {Promise<{ topicId: number|string, boxId: number, status: number, url: string }>}
 *
 * @example
 * import moveToPaperTrail from 'kody:@danj/hey-email/paper-trail'
 * const moved = await moveToPaperTrail({ topicId: 123456789 })
 */
export async function moveToPaperTrail(input = {}) {
  const topicId = await resolveTopicId(input)
  const boxId = await paperTrailBoxId()
  const path = `/topics/${topicId}/moves.json`
  const { status } = await heyRequest(path, {
    method: 'POST',
    headers: JSON_HEADERS,
    body: JSON.stringify({ box_id: boxId }),
  })
  return {
    topicId,
    boxId,
    status,
    url: `${BASE}/topics/${topicId}`,
  }
}

export default moveToPaperTrail