// apps/hq/test/documents.test.ts
import { describe, it, expect } from 'vitest'
import { openDb } from '../src/db'
import { createClient } from '../src/repos-clients'
import { createModule, setPrice } from '../src/repos-modules'
import {
  createDraft, issueDocument, convertDocument, createCreditNote, cancelDocument, getDocument,
} from '../src/repos-documents'

function setup() {
  const db = openDb(':memory:')
  db.prepare(`INSERT INTO setting (key, value) VALUES ('company.state_code','32')`).run()
  db.prepare(`INSERT INTO tax_class (class_code, rate_pct_bp, effective_from) VALUES ('GST18', 1800, '2017-07-01')`).run()
  const c = createClient(db, 'u1', { name: 'Acme', stateCode: '32' })
  const m = createModule(db, 'u1', { code: 'POS', name: 'POS Billing' })
  setPrice(db, 'u1', { moduleId: m.id, kind: 'yearly', pricePaise: 10_000_00, effectiveFrom: '2026-04-01' })
  return { db, c, m }
}

describe('documents', () => {
  it('quotation: ₹10,000 + 18% intra-state = CGST 900 + SGST 900, payable ₹11,800', () => {
    const { db, c, m } = setup()
    const d = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    expect(d.taxablePaise).toBe(10_000_00)
    expect(d.cgstPaise).toBe(900_00)
    expect(d.sgstPaise).toBe(900_00)
    expect(d.igstPaise).toBe(0)
    expect(d.payablePaise).toBe(11_800_00)
    expect(d.status).toBe('draft')
    expect(d.docNo).toBeNull()
  })
  it('inter-state client gets IGST', () => {
    const { db, m } = setup()
    const db2 = db
    const kar = createClient(db2, 'u1', { name: 'BLR Co', stateCode: '29' })
    const d = createDraft(db2, 'u1', { docType: 'INVOICE', clientId: kar.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    expect(d.igstPaise).toBe(1_800_00)
    expect(d.cgstPaise).toBe(0)
  })
  it('issue assigns a series number; convert QT→INV carries lines and links back', () => {
    const { db, c, m } = setup()
    const qt = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    const issued = issueDocument(db, 'u1', qt.id)
    expect(issued.docNo).toMatch(/^QT\/\d{2}-\d{2}-\d{4}$/)
    const inv = convertDocument(db, 'u1', qt.id, 'INVOICE')
    expect(inv.refDocId).toBe(qt.id)
    expect(inv.payablePaise).toBe(qt.payablePaise)
  })
  it('line contents default to the module quote content, and can be overridden per line', () => {
    const { db, c } = setup()
    const sms = createModule(db, 'u1', {
      code: 'SMS', name: 'SMS Gateway', quoteContent: ['Bulk SMS gateway', 'DLT registration'],
    })
    setPrice(db, 'u1', { moduleId: sms.id, kind: 'yearly', pricePaise: 5_000_00, effectiveFrom: '2026-04-01' })
    const d = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: sms.id, qty: 1, kind: 'yearly' }] })
    expect(d.payload.lineContents).toEqual([['Bulk SMS gateway', 'DLT registration']])
    const d2 = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: sms.id, qty: 1, kind: 'yearly', contentLines: ['Custom scope only'] }] })
    expect(d2.payload.lineContents).toEqual([['Custom scope only']])
  })

  it('a module without quote content contributes an empty content array', () => {
    const { db, c, m } = setup()
    const d = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    expect(d.payload.lineContents).toEqual([[]])
  })

  it('a pack (non-standard edition) prices from that edition and prints the pack name on the line', () => {
    const { db, c, m } = setup()
    setPrice(db, 'u1', { moduleId: m.id, edition: 'SMS-50K', kind: 'yearly', pricePaise: 5_000_00, effectiveFrom: '2026-04-01' })
    const d = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly', edition: 'SMS-50K' }] })
    expect(d.taxablePaise).toBe(5_000_00)
    expect(d.payload.lines[0]!.name).toContain('— SMS-50K')
    const std = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    expect(std.payload.lines[0]!.name).not.toContain('—')
  })

  it('convert is one-shot: a live forward child blocks re-convert; cancelling it re-opens (rule 4 / F4)', () => {
    const { db, c, m } = setup()
    const qt = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    const inv = convertDocument(db, 'u1', qt.id, 'INVOICE')
    // one sale, one invoice — a double-click cannot mint a second legal document
    expect(() => convertDocument(db, 'u1', qt.id, 'INVOICE')).toThrow(/already converted/i)
    expect(() => convertDocument(db, 'u1', qt.id, 'PROFORMA')).toThrow(/already converted/i)
    // a cancelled child is dead paper: the path re-opens
    issueDocument(db, 'u1', inv.id)
    cancelDocument(db, 'u1', inv.id)
    const inv2 = convertDocument(db, 'u1', qt.id, 'INVOICE')
    expect(inv2.refDocId).toBe(qt.id)
  })

  it('QT→PROFORMA moves the quotation out of the sent set (status → invoiced)', () => {
    const { db, c, m } = setup()
    const qt = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
    const pi = convertDocument(db, 'u1', qt.id, 'PROFORMA')
    expect(pi.docType).toBe('PROFORMA')
    expect(pi.status).toBe('draft')
    expect(getDocument(db, qt.id)!.status).toBe('invoiced') // never re-enters scan/pipeline 'sent' sets
  })

  it('→INVOICE recomputes GST on the invoice date (rule 2 / F3); QT→PI copies verbatim', () => {
    const { db, c, m } = setup()
    const qt = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] }) // 18% → ₹11,800
    const pi = convertDocument(db, 'u1', qt.id, 'PROFORMA')
    expect(pi.payablePaise).toBe(11_800_00) // copy-only: both are non-legal paper
    // The rate changes (new dated tax_class row) before the invoice is drawn.
    const today = new Date().toISOString().slice(0, 10)
    db.prepare(
      `INSERT INTO tax_class (class_code, rate_pct_bp, effective_from) VALUES ('GST18', 2800, ?)`,
    ).run(today)
    const inv = convertDocument(db, 'u1', pi.id, 'INVOICE')
    expect(inv.taxablePaise).toBe(10_000_00)
    expect(inv.cgstPaise).toBe(1_400_00)
    expect(inv.sgstPaise).toBe(1_400_00)
    expect(inv.payablePaise).toBe(12_800_00) // the rate that is law on the invoice's own date
    expect(getDocument(db, pi.id)!.payablePaise).toBe(11_800_00) // source untouched
  })

  it('credit note defaults to full value against the invoice; cancel keeps the number', () => {
    const { db, c, m } = setup()
    const inv = issueDocument(db, 'u1', createDraft(db, 'u1', { docType: 'INVOICE', clientId: c.id,
      lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] }).id)
    const cn = createCreditNote(db, 'u1', inv.id)
    expect(cn.docType).toBe('CREDIT_NOTE')
    expect(cn.payablePaise).toBe(inv.payablePaise)
    const cancelled = cancelDocument(db, 'u1', inv.id)
    expect(cancelled.status).toBe('cancelled')
    expect(cancelled.docNo).toBe(inv.docNo) // number consumed, never reused
  })
})