// ── Job Offer API — Uber-style offer/accept for dispatch jobs ────────────────
// Offers are stored as "Dispatch Offer" docs in ERPNext.
// Flow: dispatcher/customer creates offer → matching techs notified → tech accepts → job assigned
// ─────────────────────────────────────────────────────────────────────────────
import { BASE_URL } from 'src/config/erpnext'
import { authFetch } from './auth'

async function apiGet (path) {
  const res = await authFetch(BASE_URL + path)
  const data = await res.json()
  if (data.exc) throw new Error(data.exc)
  return data
}

async function apiPut (doctype, name, body) {
  const res = await authFetch(
    `${BASE_URL}/api/resource/${encodeURIComponent(doctype)}/${encodeURIComponent(name)}`,
    { method: 'PUT', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(body) },
  )
  const data = await res.json()
  if (data.exc) throw new Error(data.exc)
  return data
}

// ── CRUD ─────────────────────────────────────────────────────────────────────

export async function fetchOffers (filters = null) {
  let url = '/api/resource/Dispatch%20Offer?fields=["*"]&limit_page_length=200&order_by=creation+desc'
  if (filters) url += '&filters=' + encodeURIComponent(JSON.stringify(filters))
  const data = await apiGet(url)
  return data.data || []
}

export async function fetchActiveOffers () {
  return fetchOffers([['status', 'in', ['open', 'pending']]])
}

export async function createOffer (payload) {
  const res = await authFetch(
    `${BASE_URL}/api/resource/Dispatch%20Offer`,
    { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(payload) },
  )
  const data = await res.json()
  if (data.exc) throw new Error(data.exc)
  return data.data
}

export async function updateOffer (name, payload) {
  return apiPut('Dispatch Offer', name, payload)
}

// ── Offer actions ────────────────────────────────────────────────────────────

export async function acceptOffer (offerName, techId) {
  return updateOffer(offerName, { status: 'accepted', accepted_by: techId, accepted_at: new Date().toISOString() })
}

export async function declineOffer (offerName, techId, reason = '') {
  // Record decline — we don't close the offer, just track who declined
  return updateOffer(offerName, {
    declined_techs: JSON.stringify([
      ...JSON.parse((await apiGet(`/api/resource/Dispatch%20Offer/${offerName}`)).data?.declined_techs || '[]'),
      { techId, reason, at: new Date().toISOString() },
    ]),
  })
}

export async function cancelOffer (offerName) {
  return updateOffer(offerName, { status: 'cancelled' })
}

export async function expireOffer (offerName) {
  return updateOffer(offerName, { status: 'expired' })
}