import { isApplicationDocumentNo } from './documentClassification.js'

export const AI_DOCUMENT_DETAIL_HREF_PREFIX = '#ai-open-document-detail:'
export const AI_APPLICATION_DETAIL_HREF_PREFIX = '#ai-open-application-detail:'

const SHORT_BUSINESS_DOCUMENT_NO_PATTERN = /^(?:A|R|D)[A-HJ-NP-Z2-9]{8}$/
const LEGACY_BUSINESS_DOCUMENT_NO_PATTERN = /^(?:AP|APP|RE|AD|EXP|CL|BX)-/

function normalizeText(value = '') {
  return String(value ?? '').trim()
}

export function isBusinessDocumentReference(value = '') {
  const text = normalizeText(value)
  return Boolean(
    text &&
    (
      SHORT_BUSINESS_DOCUMENT_NO_PATTERN.test(text) ||
      LEGACY_BUSINESS_DOCUMENT_NO_PATTERN.test(text)
    )
  )
}

function parseDetailReferencePayload(reference = '', options = {}) {
  const text = normalizeText(reference)
  if (!text) {
    return null
  }

  const params = new URLSearchParams(text)
  const claimId = normalizeText(params.get('claim_id') || params.get('claimId'))
  const claimNo = normalizeText(
    params.get('claim_no') ||
    params.get('claimNo') ||
    params.get('document_no') ||
    params.get('documentNo')
  )
  const documentType = normalizeText(options.documentType)

  if (claimId || claimNo) {
    return {
      reference: claimNo || claimId,
      claimId,
      claimNo,
      ...(documentType ? { documentType } : {})
    }
  }

  return {
    reference: text,
    ...(documentType ? { documentType } : {})
  }
}

function parseAiDetailHref(href = '', prefix = '', options = {}) {
  const value = normalizeText(href)
  if (!value.startsWith(prefix)) {
    return null
  }
  const encodedReference = value.slice(prefix.length)
  if (!encodedReference) {
    return null
  }
  try {
    return parseDetailReferencePayload(decodeURIComponent(encodedReference), options)
  } catch {
    return parseDetailReferencePayload(encodedReference, options)
  }
}

export function parseAiDocumentDetailHref(href = '') {
  return parseAiDetailHref(href, AI_DOCUMENT_DETAIL_HREF_PREFIX)
}

export function parseAiApplicationDetailHref(href = '') {
  return parseAiDetailHref(href, AI_APPLICATION_DETAIL_HREF_PREFIX, { documentType: 'application' })
}

function resolveExplicitClaimId(source = {}) {
  const claimNo = normalizeText(source.claimNo || source.claim_no || source.documentNo || source.document_no)
  const rawClaimId = normalizeText(source.claimId || source.claim_id || source.id)
  if (!rawClaimId || rawClaimId === claimNo || isBusinessDocumentReference(rawClaimId)) {
    return ''
  }
  return rawClaimId
}

export function buildAiDocumentDetailHref(source = {}, options = {}) {
  const prefix = normalizeText(options.prefix) || AI_DOCUMENT_DETAIL_HREF_PREFIX
  const claimId = resolveExplicitClaimId(source)
  const claimNo = normalizeText(source.claimNo || source.claim_no || source.documentNo || source.document_no)
  const fallback = normalizeText(source.reference)

  if (claimId || claimNo) {
    const params = new URLSearchParams()
    if (claimId) {
      params.set('claim_id', claimId)
    }
    if (claimNo) {
      params.set('claim_no', claimNo)
    }
    return `${prefix}${encodeURIComponent(params.toString())}`
  }

  return fallback ? `${prefix}${encodeURIComponent(fallback)}` : ''
}

export function buildAiDocumentDetailRequest(detailReference = {}) {
  const reference = normalizeText(detailReference.reference)
  const explicitClaimId = resolveExplicitClaimId(detailReference)
  const explicitClaimNo = normalizeText(
    detailReference.claimNo ||
    detailReference.claim_no ||
    detailReference.documentNo ||
    detailReference.document_no
  )
  const referenceIsBusinessNo = isBusinessDocumentReference(reference)
  const claimId = explicitClaimId || (!referenceIsBusinessNo ? reference : '')
  const claimNo = explicitClaimNo || (referenceIsBusinessNo ? reference : '')
  const lookupReference = claimId || claimNo || reference
  const displayReference = claimNo || reference || lookupReference
  const documentTypeCode = normalizeText(
    detailReference.documentTypeCode ||
    detailReference.document_type_code ||
    detailReference.documentType ||
    detailReference.document_type
  ).toLowerCase()
  const isApplication = documentTypeCode === 'application' || isApplicationDocumentNo(displayReference)

  return {
    id: lookupReference,
    claimId,
    claimNo,
    documentNo: displayReference,
    documentType: isApplication ? 'application' : 'reimbursement',
    documentTypeCode: isApplication ? 'application' : 'reimbursement',
    detailLookupOnly: true,
    source: 'ai-conversation',
    returnTo: 'conversation'
  }
}