// Based on OpenClaw Browser Extension Relay (MIT License)
// https://github.com/nicepkg/openclaw

function hasCdpVersionShape(data) {
  return !!data && typeof data === 'object' && 'Browser' in data && 'Protocol-Version' in data
}

/**
 * Turn whatever someone typed into a bare host.
 *
 * People paste the address they use for Officer, which has a scheme on it and sometimes a port and a
 * path. Taking it raw produced `http://https://platform.officer.dev:18792/` — a URL that cannot resolve,
 * reported as "Relay not reachable", which reads as the relay being down rather than the address being
 * mangled. Reported by the owner, with a screenshot, as "very very bad".
 *
 * Returns the host and, when the input carried one, the port — so pasting `host:1234` moves the port
 * field rather than being silently dropped.
 *
 * ── The scheme is always https ──
 *
 * Whatever was typed. `http://` in the box becomes https, and nothing becomes https. The relay carries a
 * pairing token on every request and drives a browser someone is signed into; sending that over plaintext
 * because a field was left blank is not a default worth having.
 */
export function normalizeHost(input) {
  let value = String(input || '').trim()
  if (!value) return { host: '', port: null }

  value = value.replace(/^[a-z][a-z0-9+.-]*:\/\//i, '') // scheme — discarded, https is forced below
  value = value.replace(/\/.*$/, '') // path
  value = value.replace(/^[^@]*@/, '') // credentials, if someone pastes them

  // IPv6 in brackets keeps its colons; anything else splits on the last one.
  let port = null
  const bracketed = value.match(/^\[(.+)\](?::(\d+))?$/)
  if (bracketed) {
    value = bracketed[1]
    if (bracketed[2]) port = Number(bracketed[2])
  } else if (/^[^:]+:(\d+)$/.test(value)) {
    const [h, p] = value.split(':')
    value = h
    port = Number(p)
  }

  return { host: value, port }
}

/** The one place a relay URL is spelled. https always — see `normalizeHost`. */
export const relayUrl = (host, port, path = '') => `https://${host}:${port}${path}`

export function classifyRelayCheckResponse(res, host, port) {
  if (!res) {
    return { action: 'throw', error: 'No response from service worker' }
  }

  if (res.status === 401) {
    return { action: 'status', kind: 'error', message: 'Relay token rejected. Check token and save again.' }
  }

  if (res.error) {
    return { action: 'throw', error: res.error }
  }

  if (!res.ok) {
    return { action: 'throw', error: `HTTP ${res.status}` }
  }

  const contentType = String(res.contentType || '')
  if (!contentType.includes('application/json')) {
    return {
      action: 'status',
      kind: 'error',
      message: `Wrong endpoint: expected Officer browser relay at this address.`,
    }
  }

  if (!hasCdpVersionShape(res.json)) {
    const browser = res.json?.Browser ?? ''
    if (browser && !browser.startsWith('Officer/')) {
      return {
        action: 'status',
        kind: 'error',
        message: `Wrong relay: found "${browser}" instead of Officer/browser-relay.`,
      }
    }
    return {
      action: 'status',
      kind: 'error',
      message: `Wrong endpoint: expected relay /json/version response.`,
    }
  }

  return { action: 'status', kind: 'ok', message: `Relay reachable and authenticated at ${relayUrl(host, port, '/')}` }
}

export function classifyRelayCheckException(err, host, port) {
  const message = String(err || '').toLowerCase()
  if (message.includes('json') || message.includes('syntax')) {
    return {
      kind: 'error',
      message: `Wrong endpoint: this is not a relay endpoint.`,
    }
  }

  // Say what was actually tried and what usually explains it. "Verify the server address" is true and
  // useless — the address is usually a real one that simply does not carry this port.
  return {
    kind: 'error',
    message:
      `Nothing answered at ${relayUrl(host, port, '/')}. The relay listens on the machine Officer runs on, ` +
      `on a port that is normally reachable only over your private network — a public hostname will not ` +
      `have it open. Try the address you use to SSH to that machine.`,
  }
}