import { formatDocNo } from '@sims/domain'
import type { DB } from './db'

export const TYPE_PREFIX: Record<string, string> = {
  QUOTATION: 'QT', PROFORMA: 'PI', INVOICE: 'INV', RECEIPT: 'RCT', CREDIT_NOTE: 'CN',
}

export function nextDocNo(db: DB, docType: string, fy: string): string {
  const prefix = `${TYPE_PREFIX[docType]}/${fy.slice(2)}`
  db.prepare(
    `INSERT INTO doc_series (doc_type, fy, prefix, next_seq) VALUES (?, ?, ?, 1)
     ON CONFLICT (doc_type, fy) DO NOTHING`,
  ).run(docType, fy, prefix)
  const row = db.prepare(`SELECT prefix, next_seq FROM doc_series WHERE doc_type=? AND fy=?`)
    .get(docType, fy) as { prefix: string; next_seq: number }
  db.prepare(`UPDATE doc_series SET next_seq = next_seq + 1 WHERE doc_type=? AND fy=?`).run(docType, fy)
  return formatDocNo(row.prefix, row.next_seq, 4)
}

/** Mid-FY cutover (spec §4): continue after the last APEX-issued number. */
export function seedSeries(db: DB, docType: string, fy: string, lastUsedSeq: number): void {
  const prefix = `${TYPE_PREFIX[docType]}/${fy.slice(2)}`
  db.prepare(
    `INSERT INTO doc_series (doc_type, fy, prefix, next_seq) VALUES (?, ?, ?, ?)
     ON CONFLICT (doc_type, fy) DO UPDATE SET next_seq = excluded.next_seq`,
  ).run(docType, fy, prefix, lastUsedSeq + 1)
}