提交室内导览交互与讲解优化

src/services/sgs/SgsMapScriptLoader.ts

@@ -0,0 +1,60 @@
+import type {
+  SgsMapSDKConstructor
+} from '@/types/sgs-map-sdk'
+
+let loadingScriptUrl = ''
+let loadRequest: Promise<SgsMapSDKConstructor> | null = null
+
+const findExistingScript = (scriptUrl: string) => (
+  Array.from(document.scripts).find((script) => script.src.endsWith(scriptUrl) || script.getAttribute('src') === scriptUrl)
+)
+
+export const loadSgsMapScript = (scriptUrl: string): Promise<SgsMapSDKConstructor> => {
+  if (typeof window === 'undefined' || typeof document === 'undefined') {
+    return Promise.reject(new Error('SGS Map SDK 只能在 H5 浏览器环境中加载'))
+  }
+
+  if (window.SGSMapSDK) {
+    return Promise.resolve(window.SGSMapSDK)
+  }
+
+  if (loadRequest && loadingScriptUrl === scriptUrl) {
+    return loadRequest
+  }
+
+  loadingScriptUrl = scriptUrl
+  const request = new Promise<SgsMapSDKConstructor>((resolve, reject) => {
+    const existingScript = findExistingScript(scriptUrl)
+    const script = existingScript || document.createElement('script')
+
+    const resolveLoadedSdk = () => {
+      if (!window.SGSMapSDK) {
+        reject(new Error('SGS Map SDK 脚本已加载，但未发现 window.SGSMapSDK'))
+        return
+      }
+
+      resolve(window.SGSMapSDK)
+    }
+
+    script.addEventListener('load', resolveLoadedSdk, { once: true })
+    script.addEventListener('error', () => {
+      reject(new Error(`SGS Map SDK 脚本加载失败: ${scriptUrl}`))
+    }, { once: true })
+
+    if (!existingScript) {
+      script.src = scriptUrl
+      script.async = true
+      document.head.appendChild(script)
+      return
+    }
+
+    if (window.SGSMapSDK) {
+      resolveLoadedSdk()
+    }
+  }).finally(() => {
+    loadRequest = null
+  })
+
+  loadRequest = request
+  return request
+}