// scrot PWA — thin client mirroring cli/scrot-clip-push, scrot-clip-pull,
// scrot-shot. Token lives in localStorage (used for every fetch here) and
// mirrored into a cookie (read server-side by /manifest.webmanifest to bake
// the token into the share_target action — see server/src/manifest.ts).

const TOKEN_KEY = 'scrot_token'

const $ = (id) => document.getElementById(id)
const toastEl = $('toast')
const onboardEl = $('onboard')
const tokenInput = $('tokenInput')

function getToken() {
  return localStorage.getItem(TOKEN_KEY) || ''
}

function setToken(token) {
  localStorage.setItem(TOKEN_KEY, token)
  // 1 year, Lax is enough since this cookie is only ever read by our own
  // manifest route, never sent cross-site meaningfully.
  document.cookie = `scrot_token=${encodeURIComponent(token)}; path=/; max-age=31536000; samesite=lax`
}

function toast(message) {
  toastEl.textContent = message
  toastEl.style.display = 'block'
  clearTimeout(toast._t)
  toast._t = setTimeout(() => { toastEl.style.display = 'none' }, 4000)
}

function refreshOnboardVisibility() {
  const has = !!getToken()
  onboardEl.style.display = has ? 'none' : 'block'
  if (has) tokenInput.value = getToken()
}

// --- onboarding: pick up #t=<token> from cli/scrot-onboard's QR/link ---
function consumeHashToken() {
  const match = location.hash.match(/(?:^#|&)t=([^&]+)/)
  if (!match) return false
  const token = decodeURIComponent(match[1])
  setToken(token)
  history.replaceState(null, '', location.pathname + location.search)
  toast('Device token saved. Add scrot to your home screen to enable "Share to scrot".')
  return true
}

const hadHashToken = consumeHashToken()
if (!hadHashToken && getToken()) setToken(getToken()) // re-assert cookie in case it expired
refreshOnboardVisibility()

$('saveToken').addEventListener('click', () => {
  const token = tokenInput.value.trim()
  if (!token) return
  setToken(token)
  refreshOnboardVisibility()
  toast('Device token saved.')
})

$('editToken').addEventListener('click', () => {
  onboardEl.style.display = 'block'
  tokenInput.focus()
})

// --- share-target redirect landing ---
const params = new URLSearchParams(location.search)
if (params.get('shared') === 'clip') toast('Shared text saved as a clip.')
if (params.get('shared') === 'shot') toast('Shared screenshot uploaded.')
if (params.get('shared') === 'empty') toast('Nothing shareable in that share (no text or image).')
if (params.has('shared')) history.replaceState(null, '', location.pathname)

// --- push clip ---
$('pasteFromClipboard').addEventListener('click', async () => {
  try {
    $('clipText').value = await navigator.clipboard.readText()
  } catch {
    toast('Clipboard read not available — paste manually instead.')
  }
})

$('pushClip').addEventListener('click', async () => {
  const text = $('clipText').value
  if (!text) return
  const result = $('clipResult')
  result.textContent = 'Sending…'
  try {
    const res = await fetch('/api/blobs', {
      method: 'POST',
      headers: { 'X-Device-Token': getToken(), 'X-Blob-Kind': 'clip', 'Content-Type': 'text/plain; charset=utf-8' },
      body: text,
    })
    if (!res.ok) throw new Error(await res.text())
    result.textContent = 'Sent.'
  } catch (err) {
    result.textContent = `Failed: ${err.message || err}`
  }
})

// --- pull clip ---
let lastPulled = ''
$('pullClip').addEventListener('click', async () => {
  const result = $('pullResult')
  result.textContent = 'Fetching…'
  try {
    const res = await fetch('/api/clip/latest', { headers: { 'X-Device-Token': getToken() } })
    if (res.status === 204) {
      result.textContent = 'No clip yet.'
      $('copyPulled').disabled = true
      return
    }
    if (!res.ok) throw new Error(await res.text())
    lastPulled = await res.text()
    result.textContent = lastPulled
    $('copyPulled').disabled = false
  } catch (err) {
    result.textContent = `Failed: ${err.message || err}`
  }
})

$('copyPulled').addEventListener('click', async () => {
  try {
    await navigator.clipboard.writeText(lastPulled)
    toast('Copied.')
  } catch {
    toast('Clipboard write not available.')
  }
})

// --- push shot ---
$('pushShot').addEventListener('click', async () => {
  const file = $('shotFile').files[0]
  const result = $('shotResult')
  if (!file) {
    result.textContent = 'Pick an image first.'
    return
  }
  result.textContent = 'Uploading…'
  try {
    const res = await fetch('/api/blobs', {
      method: 'POST',
      headers: { 'X-Device-Token': getToken(), 'X-Blob-Kind': 'shot', 'Content-Type': file.type || 'application/octet-stream' },
      body: file,
    })
    if (!res.ok) throw new Error(await res.text())
    const { url } = await res.json()
    const fullUrl = new URL(url, location.origin).toString()
    result.innerHTML = `<a href="${fullUrl}" target="_blank" rel="noopener">${fullUrl}</a>`
    try {
      await navigator.clipboard.writeText(fullUrl)
      toast('Link copied to clipboard.')
    } catch { /* clipboard write may be unavailable; link is still shown above */ }
  } catch (err) {
    result.textContent = `Failed: ${err.message || err}`
  }
})