import { test } from 'node:test'
import assert from 'node:assert/strict'
import { adminOfferView } from '../server/services/offers.js'

const DAY = 86400000
const iso = (ms) => new Date(ms).toISOString()
const ymd = (ms) => iso(ms).slice(0, 10)
const now = Date.now()

const offer = (fields = {}) => ({
  $id: 'offer-1', $createdAt: iso(now - DAY), status: 'offen', scope: 'neu', months: 2,
  monthlyPriceCents: 2500, regularPriceCents: 5000, customerId: 'c1',
  validUntil: `${ymd(now + 10 * DAY)}T00:00:00.000Z`, notifiedAt: null, ...fields,
})
const customer = { name: 'Martin', email: 'martin@example.invalid' }

test('Offenes, gültiges Angebot: Mail kann (erneut) raus, Adresse steht in der Admin-Ansicht', () => {
  const v = adminOfferView(offer(), customer)
  assert.equal(v.mailSendable, true)
  assert.equal(v.customerEmail, 'martin@example.invalid')
  assert.equal(v.notifiedAt, null)
  assert.equal(adminOfferView(offer({ notifiedAt: iso(now) }), customer).mailSendable, true)
})

test('Keine Mail bei abgelaufenem, zurückgezogenem oder eingelöstem Angebot und ohne Adresse', () => {
  assert.equal(adminOfferView(offer({ validUntil: `${ymd(now - 2 * DAY)}T00:00:00.000Z` }), customer).mailSendable, false)
  assert.equal(adminOfferView(offer({ status: 'zurueckgezogen' }), customer).mailSendable, false)
  const sub = { startedAt: iso(now - DAY), trialEnd: null }
  assert.equal(adminOfferView(offer({ status: 'aktiv', appliedAt: iso(now - DAY + 5000) }), customer, sub).mailSendable, false)
  const v = adminOfferView(offer(), { name: 'Ohne Mail', email: '' })
  assert.equal(v.mailSendable, false)
  assert.equal(v.customerEmail, '')
})

test('Laufendes Abo: Mail nur, solange die erste rabattierte Abbuchung bevorsteht', () => {
  const future = adminOfferView(
    offer({ status: 'aktiv', scope: 'laufend', appliedAt: iso(now - 3600000) }),
    customer,
    { startedAt: iso(now - 10 * DAY), trialEnd: null }
  )
  assert.equal(future.mailSendable, true)
  const past = adminOfferView(
    offer({ status: 'aktiv', scope: 'laufend', appliedAt: iso(now - 40 * DAY) }),
    customer,
    { startedAt: iso(now - 50 * DAY), trialEnd: null }
  )
  assert.equal(past.mailSendable, false)
  // Abo-Dokument fehlt: Termin unbekannt, also keine Mail
  assert.equal(adminOfferView(offer({ status: 'aktiv', scope: 'laufend', appliedAt: iso(now) }), customer, null).mailSendable, false)
})