// apps/hq/test/public-share.test.ts
import { describe, it, expect } from 'vitest'
import express from 'express'
import { openDb } from '../src/db'
import { seedIfEmpty } from '../src/seed'
import { createStaff } from '../src/auth'
import { createClient } from '../src/repos-clients'
import { createModule, setPrice } from '../src/repos-modules'
import { createDraft } from '../src/repos-documents'
import { mintShare, revokeShare } from '../src/repos-shares'
import { mountPublicShare } from '../src/server'

/**
 * The PUBLIC read route GET /share/:token — mounted OUTSIDE the /api auth router.
 * A live token renders exactly one document via the existing documentHtml/renderPdf
 * path and returns it inline (application/pdf); unknown/expired/revoked → a plain 404
 * HTML page. No auth header is ever required, and lookups are rate-limited per IP.
 *
 * renderPdf is injected (a fake %PDF- buffer) so the route logic is exercised without
 * launching Chrome — the house pattern for every PDF-touching test in this suite.
 */
function setup(rateLimit?: { limit: number; windowMs: number }) {
  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 Traders', code: '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' })
  const doc = createDraft(db, 'u1', { docType: 'QUOTATION', clientId: c.id,
    lines: [{ moduleId: m.id, qty: 1, kind: 'yearly' }] })
  const rendered: string[] = []
  const fakePdf = async (html: string): Promise<Buffer> => { rendered.push(html); return Buffer.from('%PDF-1.4 fake') }
  const app = express(); app.use(express.json()); app.locals['db'] = db
  const deps: Parameters<typeof mountPublicShare>[2] = { renderPdf: fakePdf }
  if (rateLimit !== undefined) deps.rateLimit = rateLimit
  mountPublicShare(app, db, deps)
  const server = app.listen(0)
  const base = `http://localhost:${(server.address() as { port: number }).port}`
  return { db, server, base, c, m, doc, rendered }
}

describe('public GET /share/:token', () => {
  it('serves the one document inline as a PDF for a live token — with NO auth header', async () => {
    const ctx = setup()
    try {
      const s = mintShare(ctx.db, 'u1', ctx.doc.id)
      const res = await fetch(`${ctx.base}/share/${s.token}`) // deliberately no authorization header
      expect(res.status).toBe(200)
      expect(res.headers.get('content-type')).toContain('application/pdf')
      const buf = Buffer.from(await res.arrayBuffer())
      expect(buf.subarray(0, 5).toString()).toBe('%PDF-')
      // Rendered exactly one document, and it was THIS document (its client is on the letterhead).
      expect(ctx.rendered.length).toBe(1)
      expect(ctx.rendered[0]).toContain('Acme Traders')
    } finally { ctx.server.close() }
  })

  it('serves the PDF inline (Content-Disposition inline, not attachment)', async () => {
    const ctx = setup()
    try {
      const s = mintShare(ctx.db, 'u1', ctx.doc.id)
      const res = await fetch(`${ctx.base}/share/${s.token}`)
      expect(res.headers.get('content-disposition')).toMatch(/^inline/)
    } finally { ctx.server.close() }
  })

  it('404s with a plain HTML "expired or invalid" page for an unknown token — renders nothing', async () => {
    const ctx = setup()
    try {
      const res = await fetch(`${ctx.base}/share/deadbeefdeadbeef`)
      expect(res.status).toBe(404)
      expect(res.headers.get('content-type')).toContain('text/html')
      const body = (await res.text()).toLowerCase()
      expect(body).toMatch(/expired|invalid/)
      expect(ctx.rendered.length).toBe(0) // a miss never touches the renderer
    } finally { ctx.server.close() }
  })

  it('404s for an expired token', async () => {
    const ctx = setup()
    try {
      const s = mintShare(ctx.db, 'u1', ctx.doc.id, { expiresDays: -1 }) // already expired
      const res = await fetch(`${ctx.base}/share/${s.token}`)
      expect(res.status).toBe(404)
      expect(ctx.rendered.length).toBe(0)
    } finally { ctx.server.close() }
  })

  it('404s for a revoked token', async () => {
    const ctx = setup()
    try {
      const s = mintShare(ctx.db, 'u1', ctx.doc.id)
      revokeShare(ctx.db, 'u1', s.id)
      const res = await fetch(`${ctx.base}/share/${s.token}`)
      expect(res.status).toBe(404)
      expect(ctx.rendered.length).toBe(0)
    } finally { ctx.server.close() }
  })

  it('rate-limits lookups per IP to blunt token brute-forcing', async () => {
    const ctx = setup({ limit: 3, windowMs: 60_000 })
    try {
      for (let i = 0; i < 3; i++) {
        const r = await fetch(`${ctx.base}/share/badtoken${i}`)
        expect(r.status).toBe(404) // allowed (though a miss), counts against the cap
      }
      const blocked = await fetch(`${ctx.base}/share/badtoken-final`)
      expect(blocked.status).toBe(429)
    } finally { ctx.server.close() }
  })
})