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

/* ============================================================
   offers.js — backend/offer/app.py.

   Permissioned OFFERS_VIEW / OFFERS_CREATE / OFFERS_EDIT / OFFERS_APPROVE, so a
   recruiter who can read offers still cannot issue one.

   List rows include candidate_name / created_by_name. Job title is still
   hydrated from /job/fetch?ids=. Create Offer uses POST /offers/jobs/sent.
   ============================================================ */

/** `status` is a free-text column defaulting to "draft"; the vocabulary is decided here. */
export const OFFER_STATUSES = ['draft', 'sent', 'failed', 'negotiating', 'accepted', 'declined', 'expired']

export const OFFER_STATUS_LABEL = {
  draft: 'Draft',
  sent: 'Sent',
  failed: 'Failed',
  negotiating: 'Negotiating',
  accepted: 'Accepted',
  declined: 'Declined',
  expired: 'Expired',
}

/** Label -> wire value, for the filter select. */
export const OFFER_STATUS_VALUE = Object.fromEntries(
  Object.entries(OFFER_STATUS_LABEL).map(([value, label]) => [label, value]),
)

const STATUS_CLASS = {
  accepted: 'b-green',
  sent: 'b-blue',
  negotiating: 'b-amber',
  declined: 'b-red',
  expired: 'b-gray',
  draft: 'b-gray',
  failed: 'b-red',
}

export function list({ offerId, status, inboxId, jobPostId, top, skip } = {}) {
  return request('/offers/fetch', {
    params: {
      offer_id: offerId,
      status,
      inbox_id: inboxId,
      job_post_id: jobPostId,
      top,
      skip,
    },
  })
}

/** One offer. GET /offers/fetch?offer_id= returns `data` as the row, not a list. */
export function get(offerId) {
  return request('/offers/fetch', { params: { offer_id: offerId } })
}

export function listCandidates({ search, top, skip } = {}) {
  return request('/offers/jobs/candidates/lists', {
    params: { search, top, skip },
  })
}

export function send(body) {
  return request('/offers/jobs/sent', { method: 'POST', body })
}

/**
 * Create a draft. All three links are REQUIRED server-side — `inbox_id` (422 if
 * blank), `job_post_id` and `candidate_user_id` (422 if not parseable as UUIDs)
 * — which is why the Create Offer picker is sourced from the pipeline board:
 * that payload is the only one carrying all three on a single row.
 */
export function create(body) {
  return request('/offers/create', { method: 'POST', body })
}

export function update(offerId, body) {
  return request('/offers/update', {
    method: 'PATCH',
    params: { offer_id: offerId },
    body,
  })
}

/**
 * Issue — stamps `issued_by` + `sent_at` and moves draft -> sent, writing a row
 * to offer_status_history. Re-issuing an already-sent offer is allowed and
 * re-stamps sent_at, which is what "Resend" means here.
 */
export function issue(offerId, body = {}) {
  return request('/offers/issue', {
    method: 'POST',
    params: { offer_id: offerId },
    body,
  })
}

/**
 * `{equity_units, equity_instrument}` -> the one string the table shows.
 * Returns null rather than "0 RSU" when nothing was agreed, so the cell reads
 * as "not offered" instead of "offered nothing".
 */
function equityLabel(units, instrument) {
  if (units == null || units === 0) return null
  const n = Number(units)
  const pretty = n >= 1000 && n % 1000 === 0 ? `${n / 1000}k` : String(n)
  return `${pretty} ${instrument || 'RSU'}`
}

/**
 * API row -> the shape Offers.jsx renders. `people` and `jobTitles` are the
 * hydration maps the screen builds once per page; both are optional so this
 * stays usable from a context that has neither.
 */
export function toOfferView(row, { people, jobTitles } = {}) {
  const person = people?.get(String(row.candidate_user_id)) ?? null
  const jobTitle = jobTitles?.get(String(row.job_post_id)) ?? null
  const status = row.status || 'draft'
  const bonusPct = row.annual_bonus_pct
  return {
    id: row.id,
    inboxId: row.inbox_id,
    manualUploadId: row.manual_upload_candidate_id ?? null,
    formDataId: row.form_data_id ?? null,
    jobPostId: row.job_post_id,
    candidateUserId: row.candidate_user_id,
    candidate: person?.name || row.candidate_name || 'Unknown candidate',
    email: person?.email ?? null,
    createdByName: row.created_by_name || null,
    jobTitle: jobTitle || '—',
    status,
    statusLabel: OFFER_STATUS_LABEL[status] ?? status,
    statusClass: STATUS_CLASS[status] ?? 'b-gray',
    base: row.base_salary ?? null,
    currency: row.currency || 'USD',
    salaryPeriod: row.salary_period || 'year',
    signingBonus: row.signing_bonus ?? null,
    bonusPct: bonusPct ?? null,
    bonus: bonusPct != null ? `${bonusPct}%` : null,
    equity: equityLabel(row.equity_units, row.equity_instrument),
    equityUnits: row.equity_units ?? null,
    equityInstrument: row.equity_instrument || null,
    // Annexure J (offer email format) fields.
    cadre: row.cadre || null,
    grossSalaryInWords: row.gross_salary_in_words || null,
    subsidizedServices: row.subsidized_services || null,
    probationPeriod: row.probation_period || null,
    noticePeriod: row.notice_period || null,
    workLocation: row.work_location || null,
    workTimings: row.work_timings || null,
    startDate: toDate(row.start_date),
    expiry: toDate(row.expiry_date),
    sent: toDate(row.sent_at),
    respondedAt: toDate(row.responded_at),
    closedAt: toDate(row.closed_at),
    created: toDate(row.created_at),
  }
}