// apps/hq/test/preview-fidelity.test.ts
import { describe, it, expect, afterAll } from 'vitest'
import express from 'express'
import { openDb } from '../src/db'
import { seedIfEmpty } from '../src/seed'
import { createStaff } from '../src/auth'
import { createClient, getClient } from '../src/repos-clients'
import { createModule, setPrice } from '../src/repos-modules'
import { createDraft } from '../src/repos-documents'
import { documentHtml } from '../src/templates'
import { apiRouter } from '../src/api'

function companyMap(db: any): Record<string, string> {
  const rows = db.prepare(`SELECT key, value FROM setting WHERE key LIKE 'company.%'`).all() as { key: string; value: string }[]
  return Object.fromEntries(rows.map((r) => [r.key, r.value]))
}

describe('preview fidelity (string identity with the PDF path)', () => {
  const db = openDb(':memory:'); seedIfEmpty(db)
  createStaff(db, { email: 'owner@test.in', displayName: 'Owner', role: 'owner', password: 'owner-password' })
  const c = createClient(db, 'u1', { name: 'Acme', code: 'ACME', stateCode: '32', address: 'Kochi', gstin: '32ABCDE1234F1Z9' })
  const m = createModule(db, 'u1', { code: 'POS', name: 'POS Billing', quoteContent: ['Cloud POS', 'GST filing'] })
  setPrice(db, 'u1', { moduleId: m.id, kind: 'yearly', pricePaise: 10_000_00, effectiveFrom: '2026-04-01' })
  const app = express(); app.use(express.json()); app.locals['db'] = db; app.use('/api', apiRouter(db))
  const server = app.listen(0)
  const base = `http://localhost:${(server.address() as { port: number }).port}/api`
  afterAll(() => server.close())

  it('preview.html === documentHtml the /pdf route would feed renderPdf', async () => {
    const input = { docType: 'INVOICE', clientId: c.id, terms: 'Net 15',
      lines: [{ moduleId: m.id, qty: 2, kind: 'yearly' }] }
    // The fixture draft: exactly what /documents/:id/pdf renders (un-issued draft, docNo=null).
    const fixture = createDraft(db, 'u1', input)
    const expected = documentHtml(fixture, getClient(db, c.id)!, companyMap(db))

    const token = (await (await fetch(`${base}/auth/login`, { method: 'POST', headers: { 'content-type': 'application/json' }, body: JSON.stringify({ email: 'owner@test.in', password: 'owner-password' }) })).json() as any).token
    const res = await fetch(`${base}/documents/preview`, { method: 'POST', headers: { 'content-type': 'application/json', authorization: `Bearer ${token}` }, body: JSON.stringify(input) })
    const out = await res.json() as any

    expect(out.html).toBe(expected) // one renderer — no drift possible
  })
})