import { request } from '../lib/apiClient'

/* ============================================================
   interviews.js — backend/job/app.py `/interview/*`.

   THREE READ MODES on one endpoint, selected by which params are present
   (backend/job/app.py::fetch_interview):
     interview_id  -> one row, bare object
     inbox_id      -> every interview on one application, list
     range         -> from_date / to_date / status / top

   Range mode only engages when at least ONE of from_date, to_date, status or
   top is set. With none of them the route raises 400 "interview_id or inbox_id
   is required" — so `list()` always sends `top`, and the screens never call it
   bare.

   Permissions are candidates.*, NOT interviews.* — the eight interviews.* tags
   exist in the catalogue but no route reads them. A user holding only
   interviews.view gets a 403 here.
   ============================================================ */

/** Status vocabulary. `interview_status` is a free-text column, so this file is
    the only place the spelling is decided; writes and filters share it. */
export const INTERVIEW_STATUSES = ['Scheduled', 'Completed', 'Cancelled', 'No Show']

/** Round vocabulary — same story: free text, pinned here. */
export const INTERVIEW_TYPES = [
  'Phone Screen',
  'Technical',
  'System Design',
  'Onsite Loop',
  'Hiring Manager',
  'Culture Fit',
  'Final Round',
]

/** Range read. `top` is always sent so the route takes the range branch. */
export function listRange({ fromDate, toDate, status, top = 200, skip } = {}) {
  return request('/interview/fetch', {
    params: {
      from_date: fromDate,
      to_date: toDate,
      status,
      top,
      skip,
    },
  })
}

export function listByInbox(inboxId) {
  return request('/interview/fetch', { params: { inbox_id: inboxId } })
}

/**
 * Schedule one interview against an APPLICATION (inbox.id), not a candidate:
 * `inbox_id` is the only link the table has, so a candidate with no inbox row
 * (a manual upload) cannot be scheduled through this endpoint at all.
 *
 * interview_date and interview_time are both `datetime` columns, so the same
 * instant goes to each rather than inventing a second one — the same rule the
 * candidate profile's Interview tab already follows.
 */
export function create({ inboxId, instant, type, status }) {
  return request('/interview/create', {
    method: 'POST',
    body: {
      inbox_id: inboxId,
      interview_date: instant,
      interview_time: instant,
      interview_type: type,
      interview_status: status,
    },
  })
}

/** Partial update. Only the keys present are written (exclude_unset server-side). */
export function update(interviewId, { instant, type, status } = {}) {
  const body = {}
  if (instant != null) {
    body.interview_date = instant
    body.interview_time = instant
  }
  if (type != null) body.interview_type = type
  if (status != null) body.interview_status = status
  return request('/interview/update', {
    method: 'PATCH',
    params: { interview_id: interviewId },
    body,
  })
}

/**
 * API row -> what the Interviews table, the Calendar grid and the Up Next rail
 * render.
 *
 * serialize_interview returns seven fields and the `interviews` table has no
 * more columns than that, so five things the prototype showed have no source:
 * meeting mode (video / on-site / phone), duration, interviewer list, the
 * feedback verdict and a numeric score. They are absent here rather than
 * defaulted, and the screens drop those columns — the same rule Jobs and
 * Candidates already follow. `job_title` is likewise absent; the caller
 * hydrates it from the application row when it has one.
 */
export function toInterviewView(row) {
  const whenRaw = row.interview_date || row.interview_time
  const when = whenRaw ? new Date(whenRaw) : null
  return {
    id: row.id,
    inboxId: row.inbox_id,
    candidate: row.candidate_name || 'Unknown candidate',
    type: row.interview_type || 'Interview',
    status: row.interview_status || 'Scheduled',
    when: when && !Number.isNaN(when.getTime()) ? when : null,
  }
}