// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
// What a page says about itself, rendered with a customer's brand: their name, their colours on the
// first byte of the document, and no trace of ConusAI's (plan item AT2.6 done_when, the rendered-page
// half; there are no emails or share images in the template to render).

import { brandTokenStyle, defineBrand } from "@app/config"
import { createElement } from "react"
import { renderToStaticMarkup } from "react-dom/server"
import { describe, expect, it } from "vitest"
import { brandHead, brandMetadata, brandTokensOnly, Document } from "../apps/web/src/ui/document"
import { appCatalogues } from "../apps/web/src/ui/messages"

const customer = defineBrand({
  name: "Acme Review",
  shortName: "Acme",
  primary: "#1a1a8c",
  logo: { light: "/acme-light.svg", dark: "/acme-dark.svg", favicon: "/acme.svg" },
})

// The layout's own consent wording in the page's locale, as RootLayout passes it.
const consent = (key: string): string => {
  const text = appCatalogues.lt?.consent?.[key]
  if (!text) throw new Error(`missing lt consent.${key}`)
  return text
}
const privacy = {
  title: consent("title"),
  body: consent("body"),
  replay: consent("replay"),
  accept: consent("accept"),
  reject: consent("reject"),
  reopen: consent("reopen"),
  gpc: consent("gpc"),
}

const render = (extra: { theme?: "dark" | "light"; observe?: { release: string; environment: string } } = {}): string =>
  renderToStaticMarkup(
    createElement(Document, {
      brand: { ...customer, style: brandTokenStyle(customer) },
      locale: "lt",
      theme: extra.theme ?? "dark",
      signedIn: false,
      signIn: "Prisijungti",
      signOut: null,
      controls: null,
      privacy,
      ...(extra.observe ? { observe: extra.observe } : {}),
      children: createElement("main", null, "turinys"),
    }),
  )

const html = render()

describe("a page rendered with a customer's brand", () => {
  it("carries the customer's name and logos and no ConusAI name", () => {
    expect(html).toContain("Acme Review")
    expect(html).toContain('src="/acme-dark.svg"')
    expect(html.toLowerCase()).not.toContain("conusai")
  })

  it("writes the brand layer as a stylesheet in the head, so the first paint is branded and a platform theme can win", () => {
    const root = /<html[^>]*>/.exec(html)?.[0] ?? ""
    expect(root).toContain('lang="lt"')
    expect(root).not.toContain("--primary")
    const layer = /<style data-brand-layer="app"[^>]*>([^<]*)<\/style>/.exec(html)?.[1] ?? ""
    expect(html.indexOf("data-brand-layer")).toBeLessThan(html.indexOf("</head>"))
    expect(layer).toMatch(/^:root:root\{.*--primary:light-dark\(#1a1a8c, ?#[0-9a-f]{6}\)/)
    expect(layer).toMatch(/--ring:light-dark\(#[0-9a-f]{6}, ?#[0-9a-f]{6}\)/)
  })

  it("leaves the colours to the platform's organization theme when there is one, keeping the brand's own tokens", () => {
    expect(brandTokensOnly({ "--primary": "#1a1a8c", "--brand-font-size-root": "16px" })).toEqual({
      "--brand-font-size-root": "16px",
    })
  })

  it("names the customer, and only the customer, in the tab and in a share card", () => {
    const metadata = JSON.stringify(brandMetadata(customer))
    expect(metadata).toContain("Acme Review")
    expect(metadata.toLowerCase()).not.toContain("conusai")
  })

  it("points the share card at the app's own image, or at the organization's on its own pages", () => {
    const app = brandMetadata(customer)
    expect(app.openGraph?.images).toEqual([{ url: "/api/brand/og", width: 1200, height: 630, alt: "Acme Review" }])
    expect(app.twitter).toMatchObject({ card: "summary_large_image", images: ["/api/brand/og"] })
    const organization = brandMetadata(customer, "/acme/brand/og")
    expect(JSON.stringify(organization)).toContain("/acme/brand/og")
    expect(JSON.stringify(organization)).not.toContain("/api/brand/og")
  })

  it("gives a link preview an absolute image address from the deployment's public URL", () => {
    const { meta } = brandHead(brandMetadata(customer), "https://app.example.test")
    expect(meta).toContainEqual({ property: "og:image", content: "https://app.example.test/api/brand/og" })
    expect(meta).toContainEqual({ name: "twitter:image", content: "https://app.example.test/api/brand/og" })
  })

  it("has exactly one element that carries the theme class: the page, not a component", () => {
    expect((html.match(/class="[^"]*\blight\b/g) ?? []).length).toBeLessThanOrEqual(1)
  })

  it("puts the light theme on the root element from the first byte, and the dark one on nothing", () => {
    expect(/<html[^>]*>/.exec(html)?.[0]).not.toMatch(/class="[^"]*\blight\b/)
    const light = render({ theme: "light" })
    expect(/<html[^>]*>/.exec(light)?.[0]).toMatch(/class="light"/)
    expect((light.match(/class="(?:[^"]* )?light(?: [^"]*)?"/g) ?? []).length).toBe(1)
  })

  it("tells the browser to start observability only when the server turned it on, without naming ConusAI", () => {
    expect(html).not.toContain("app-observe")
    const observed = render({ observe: { release: "2026.10.1", environment: "production" } })
    expect(observed).toContain('name="app-observe"')
    expect(observed).toContain('data-release="2026.10.1"')
    expect(observed.toLowerCase()).not.toContain("conusai")
  })
})