/**
 * Canonical PearData binary host list (64-bit only — no ia32 / armv7).
 * Used by make scripts, predownload-electron, and release tooling.
 */
'use strict'

/** @type {readonly string[]} */
const SERVER_LINUX = Object.freeze(['linux-x64', 'linux-arm64'])

/** @type {readonly string[]} */
const ALL_64 = Object.freeze([
  'linux-x64',
  'linux-arm64',
  'darwin-x64',
  'darwin-arm64',
  'win32-x64',
  'win32-arm64',
])

/**
 * Hosts where `@qvac/llm-llamacpp` (and related) ship Bare prebuilds.
 * Matches prebuilds under node_modules/@qvac/llm-llamacpp/prebuilds.
 * win32-arm64 is intentionally absent — QVAC Windows is x64-only today.
 *
 * @see https://docs.qvac.tether.io/installation (Windows: x64)
 * @type {readonly string[]}
 */
const QVAC_NATIVE_HOSTS = Object.freeze([
  'linux-x64',
  'linux-arm64',
  'darwin-x64',
  'darwin-arm64',
  'win32-x64',
])

/**
 * @param {string} host e.g. win32-arm64
 * @returns {boolean}
 */
function hostSupportsQvacNative(host) {
  return QVAC_NATIVE_HOSTS.includes(host)
}

/**
 * @param {string|undefined} envVal comma-separated override
 * @param {readonly string[]} fallback
 */
function parseHostList(envVal, fallback = ALL_64) {
  if (!envVal || !String(envVal).trim()) return [...fallback]
  return String(envVal)
    .split(',')
    .map((s) => s.trim())
    .filter(Boolean)
}

/**
 * electron-forge platform/arch for a host triple
 * @param {string} host
 * @returns {{ platform: string, arch: string }}
 */
function hostToElectron(host) {
  const [platform, arch] = host.split('-')
  if (!platform || !arch) throw new Error(`Invalid host: ${host}`)
  return { platform, arch }
}

/**
 * npm script name for client package, or null
 * @param {string} host
 */
function clientNpmScript(host) {
  const map = {
    'linux-x64': 'make:client:linux-x64',
    'linux-arm64': 'make:client:linux-arm64',
    'darwin-arm64': 'make:client:darwin-arm64',
    'darwin-x64': 'make:client:darwin-x64',
    'win32-x64': 'make:client:win32-x64',
    'win32-arm64': 'make:client:win32-arm64',
  }
  return map[host] || null
}

/**
 * npm script name for server package, or null
 * @param {string} host
 */
function serverNpmScript(host) {
  // Server is Linux-only
  const map = {
    'linux-x64': 'make:server:linux-x64',
    'linux-arm64': 'make:server:linux-arm64',
  }
  return map[host] || null
}

module.exports = {
  SERVER_LINUX,
  ALL_64,
  CLIENT_HOSTS: ALL_64,
  QVAC_NATIVE_HOSTS,
  hostSupportsQvacNative,
  parseHostList,
  hostToElectron,
  clientNpmScript,
  serverNpmScript,
}