refactor: split update service responsibilities

src/main/services/update/update-support.ts

@@ -0,0 +1,76 @@
+import { app } from 'electron'
+import * as fs from 'fs'
+import * as path from 'path'
+import type { UpdateConfig } from '../../types/config.schema'
+import type { ReleaseChannel, UpdateStatus } from '../../types/update.types'
+
+export function appendPortableLaunchLog(
+  logPath: string,
+  message: string,
+  meta?: Record<string, unknown>
+): void {
+  try {
+    fs.mkdirSync(path.dirname(logPath), { recursive: true })
+    const timestamp = new Date().toISOString()
+    const suffix = meta ? ` ${JSON.stringify(meta)}` : ''
+    fs.appendFileSync(logPath, `${timestamp} ${message}${suffix}\n`, 'utf-8')
+  } catch {
+    // Best-effort debug log only.
+  }
+}
+
+export function getCurrentAppVersion(): string {
+  return typeof app?.getVersion === 'function' ? app.getVersion() : '0.0.0'
+}
+
+export function getCurrentChannel(): ReleaseChannel {
+  return typeof __APP_CHANNEL__ !== 'undefined' ? __APP_CHANNEL__ : 'stable'
+}
+
+export function isMissingObjectError(error: unknown): boolean {
+  if (!error || typeof error !== 'object') {
+    return false
+  }
+
+  const candidate = error as {
+    name?: string
+    Code?: string
+    code?: string
+    message?: string
+  }
+
+  return (
+    candidate.name === 'NoSuchKey' ||
+    candidate.Code === 'NoSuchKey' ||
+    candidate.code === 'NoSuchKey' ||
+    candidate.message?.includes('The specified key does not exist') === true
+  )
+}
+
+export function getSupportState(config: UpdateConfig | null): {
+  supported: boolean
+  reason?: string
+} {
+  if (process.platform !== 'win32') {
+    return { supported: false, reason: '当前仅支持 Windows 自动更新' }
+  }
+
+  if (app?.isPackaged) {
+    return { supported: true }
+  }
+
+  if (config?.allowDevMode) {
+    return { supported: true, reason: '开发模式调试已启用更新检查' }
+  }
+
+  return { supported: false, reason: '开发模式默认禁用自动更新检查' }
+}
+
+export const DEFAULT_STATUS: UpdateStatus = {
+  enabled: false,
+  supported: false,
+  phase: 'idle',
+  currentVersion: getCurrentAppVersion(),
+  currentChannel: getCurrentChannel(),
+  currentUserType: null
+}