/**
 * HtmlPreviewFrame delivery tests — the piece that exists ONLY because of the
 * DSH Desktop renderer fence: the host refuses `/sidebar/html/…` to any
 * request without the Electron renderer capability, which a frame sandboxed
 * without allow-same-origin (an opaque origin) can never carry. The document
 * is therefore fetched by the MAIN frame and handed over through `srcdoc`,
 * with the sandbox attribute untouched.
 *
 * Mounted client-side (createRoot + act) because the delivery path is an
 * effect; the sandbox-contract assertions live in sandbox-views.spec.tsx.
 */
// @vitest-environment jsdom
import { afterEach, describe, expect, it, vi } from 'vitest'
import { createElement } from 'react'
import { act } from 'react-dom/test-utils'
import { HtmlPreviewFrame } from '../src/client/HtmlPreviewFrame.tsx'
import { HTML_IFRAME_SANDBOX } from '../src/client/html-preview.ts'
import { renderRoot, setupReactAct } from './test-utils.ts'

setupReactAct()

const URL_ = '/sidebar/html/s1/p/a/index.html'
const DOC = '<html><head><title>t</title></head><body><h1>hi</h1></body></html>'

/** Stub the global fetch with one canned response. */
function stubFetch(text: string, ok = true): void {
  vi.stubGlobal('fetch', vi.fn(async () => ({ ok, status: ok ? 200 : 403, text: async () => text })))
}

/** Flush the fetch's microtasks + the React commit they trigger. */
async function flush(): Promise<void> {
  await act(async () => { await new Promise(resolve => { setTimeout(resolve, 0) }) })
}

afterEach(() => { vi.unstubAllGlobals() })

describe('HtmlPreviewFrame delivery', () => {
  it('starts empty, never pointing the frame at the route itself', () => {
    stubFetch(DOC)
    const r = renderRoot(createElement(HtmlPreviewFrame, { url: URL_, sandboxed: true, title: 'index.html' }))
    const iframe = r.container.querySelector('iframe')!
    expect(iframe.getAttribute('srcdoc')).toBe('')
    expect(iframe.getAttribute('src')).toBe(null)
    // The boundary is unchanged while the document is in flight.
    expect(iframe.getAttribute('sandbox')).toBe(HTML_IFRAME_SANDBOX)
    r.unmount()
  })

  it('hands the fetched markup to the frame through srcdoc, base-rewritten, sandbox kept', async () => {
    stubFetch(DOC)
    const r = renderRoot(createElement(HtmlPreviewFrame, { url: URL_, sandboxed: true, title: 'index.html' }))
    await flush()
    const iframe = r.container.querySelector('iframe')!
    const srcdoc = iframe.getAttribute('srcdoc')
    expect(srcdoc).toContain('<base href="/sidebar/html/s1/p/a/">')
    expect(srcdoc).toContain('<h1>hi</h1>')
    // Still no route src: the opaque frame must not be asked to fetch.
    expect(iframe.getAttribute('src')).toBe(null)
    expect(iframe.getAttribute('sandbox')).toBe(HTML_IFRAME_SANDBOX)
    expect(HTML_IFRAME_SANDBOX).not.toContain('allow-same-origin')
    r.unmount()
  })

  it('drops the sandbox attribute for the warned unlock path (the frame inherits the GUI origin)', async () => {
    stubFetch(DOC)
    const r = renderRoot(createElement(HtmlPreviewFrame, { url: URL_, sandboxed: false, title: 'index.html' }))
    await flush()
    const iframe = r.container.querySelector('iframe')!
    expect(iframe.getAttribute('sandbox')).toBe(null)
    expect(iframe.getAttribute('srcdoc')).toContain('<h1>hi</h1>')
    r.unmount()
  })

  it('falls back to the route URL when the fetch fails, so the route still answers', async () => {
    stubFetch('', false)
    const r = renderRoot(createElement(HtmlPreviewFrame, { url: URL_, sandboxed: true, title: 'index.html' }))
    await flush()
    const iframe = r.container.querySelector('iframe')!
    expect(iframe.getAttribute('src')).toBe(URL_)
    expect(iframe.getAttribute('srcdoc')).toBe(null)
    r.unmount()
  })

  it('refetches when the previewed file changes', async () => {
    stubFetch('<h1>one</h1>')
    const r = renderRoot(createElement(HtmlPreviewFrame, { url: URL_, sandboxed: true, title: 'a.html' }))
    await flush()
    expect(r.container.querySelector('iframe')!.getAttribute('srcdoc')).toContain('<h1>one</h1>')
    stubFetch('<h1>two</h1>')
    r.rerender(createElement(HtmlPreviewFrame, { url: '/sidebar/html/s1/p/a/two.html', sandboxed: true, title: 'b.html' }))
    await flush()
    expect(r.container.querySelector('iframe')!.getAttribute('srcdoc')).toContain('<h1>two</h1>')
    r.unmount()
  })
})