import { findColumn } from '../shared/column-utils'
import type { DetectedSupplierColumns } from './types'

const NAME_KEYWORDS = [
  'leverantörsnamn', 'leverantorsnamn', 'leverantör', 'leverantor', 'namn', 'name',
  'supplier', 'supplier name', 'företag', 'foretag', 'company', 'vendor',
]

const ORG_NUMBER_KEYWORDS = [
  'orgnr', 'org nr', 'organisationsnummer', 'organisationsnr', 'org',
  'personnr', 'personnummer', 'org number', 'organization number',
]

const SUPPLIER_TYPE_KEYWORDS = [
  'leverantörstyp', 'leverantorstyp', 'typ', 'type', 'supplier type',
  'supplier_type',
]

const EMAIL_KEYWORDS = ['epost', 'e post', 'email', 'mail', 'e mail', 'e-post']

const PHONE_KEYWORDS = [
  'telefon', 'tel', 'phone', 'mobil', 'mobile', 'telefonnummer',
]

const ADDRESS_LINE1_KEYWORDS = [
  'adress', 'address', 'gatuadress', 'street', 'gata',
  'address line 1', 'address1', 'adressrad 1',
]

const ADDRESS_LINE2_KEYWORDS = [
  'address line 2', 'address2', 'adressrad 2', 'c o', 'co',
]

const POSTAL_CODE_KEYWORDS = [
  'postnr', 'postnummer', 'postal code', 'postal_code', 'zip', 'zip code',
]

const CITY_KEYWORDS = ['ort', 'stad', 'city', 'postort']

const COUNTRY_KEYWORDS = ['land', 'country']

const VAT_NUMBER_KEYWORDS = [
  'vat', 'vatnr', 'vat nr', 'vat number', 'momsnummer', 'momsregistreringsnummer',
  'momsregnr', 'moms nr',
]

const BANKGIRO_KEYWORDS = [
  'bankgiro', 'bg', 'bgnr', 'bg nr', 'bankgironr', 'bankgironummer',
]

const PLUSGIRO_KEYWORDS = [
  'plusgiro', 'pg', 'pgnr', 'pg nr', 'postgiro', 'plusgironummer',
]

const BANK_ACCOUNT_KEYWORDS = [
  'bankkonto', 'kontonummer', 'bank account', 'bank_account', 'clearing',
]

const IBAN_KEYWORDS = ['iban', 'iban nr']

const BIC_KEYWORDS = ['bic', 'swift', 'swift code', 'bic code']

const PAYMENT_TERMS_KEYWORDS = [
  'betalningsvillkor', 'betalvillkor', 'payment terms', 'kredittid', 'kreditdagar',
  'dagar', 'förfallodagar', 'forfallodagar',
]

const CURRENCY_KEYWORDS = ['valuta', 'currency', 'curr']

const NOTES_KEYWORDS = [
  'anteckning', 'anteckningar', 'notes', 'kommentar', 'kommentarer', 'comment',
  'note', 'beskrivning',
]

export function detectSupplierColumns(headers: string[]): DetectedSupplierColumns {
  const taken = new Set<number>()

  const name_col = findColumn(headers, NAME_KEYWORDS, taken) ?? -1
  const org_number_col = findColumn(headers, ORG_NUMBER_KEYWORDS, taken)
  const supplier_type_col = findColumn(headers, SUPPLIER_TYPE_KEYWORDS, taken)
  const email_col = findColumn(headers, EMAIL_KEYWORDS, taken)
  const phone_col = findColumn(headers, PHONE_KEYWORDS, taken)
  const address_line1_col = findColumn(headers, ADDRESS_LINE1_KEYWORDS, taken)
  const address_line2_col = findColumn(headers, ADDRESS_LINE2_KEYWORDS, taken)
  const postal_code_col = findColumn(headers, POSTAL_CODE_KEYWORDS, taken)
  const city_col = findColumn(headers, CITY_KEYWORDS, taken)
  const country_col = findColumn(headers, COUNTRY_KEYWORDS, taken)
  const vat_number_col = findColumn(headers, VAT_NUMBER_KEYWORDS, taken)
  const bankgiro_col = findColumn(headers, BANKGIRO_KEYWORDS, taken)
  const plusgiro_col = findColumn(headers, PLUSGIRO_KEYWORDS, taken)
  const bank_account_col = findColumn(headers, BANK_ACCOUNT_KEYWORDS, taken)
  const iban_col = findColumn(headers, IBAN_KEYWORDS, taken)
  const bic_col = findColumn(headers, BIC_KEYWORDS, taken)
  const payment_terms_col = findColumn(headers, PAYMENT_TERMS_KEYWORDS, taken)
  const default_currency_col = findColumn(headers, CURRENCY_KEYWORDS, taken)
  const notes_col = findColumn(headers, NOTES_KEYWORDS, taken)

  let confidence = 0
  if (name_col >= 0) {
    const matched = [
      org_number_col, email_col, phone_col, address_line1_col,
      postal_code_col, city_col, vat_number_col, bankgiro_col, iban_col,
      payment_terms_col,
    ].filter((c) => c !== null).length
    confidence = 0.55 + Math.min(matched, 6) * 0.075
  }

  return {
    name_col: name_col >= 0 ? name_col : 0,
    org_number_col,
    supplier_type_col,
    email_col,
    phone_col,
    address_line1_col,
    address_line2_col,
    postal_code_col,
    city_col,
    country_col,
    vat_number_col,
    bankgiro_col,
    plusgiro_col,
    bank_account_col,
    iban_col,
    bic_col,
    payment_terms_col,
    default_currency_col,
    notes_col,
    confidence: Math.min(Math.round(confidence * 100) / 100, 1),
  }
}