Handle unassigned device after child deletion

banban-mini/src/pages/device/index.tsx

@@ -126,6 +126,7 @@ function getAlarmLocationHint(alarm: DeviceAlarmItem | null): string {
 export default function Device() {
   const systemBanner = useSystemBanner()
   const [binding, setBinding] = useState<Binding | null>(null)
+  const [pendingBinding, setPendingBinding] = useState<Binding | null>(null)
   const [child, setChild] = useState<Child | null>(null)
   const [deviceStatus, setDeviceStatus] = useState<DeviceStatus | null>(null)
   const [deviceAlarms, setDeviceAlarms] = useState<DeviceAlarmItem[]>([])
@@ -144,6 +145,7 @@ export default function Device() {
   const loadDeviceInfo = async () => {
     if (!getToken()) {
       setBinding(null)
+      setPendingBinding(null)
       setChild(null)
       setDeviceStatus(null)
       setDeviceAlarms([])
@@ -159,6 +161,7 @@ export default function Device() {
       const context = await loadCurrentChildBindingContext()
       setChild(context.currentChild)
       setBinding(context.currentBinding)
+      setPendingBinding(context.pendingBinding)
 
       if (context.currentBinding?.device_id) {
         const [nextStatus, nextAlarms] = await Promise.all([
@@ -324,6 +327,7 @@ export default function Device() {
   }
 
   if (!child) {
+    const hasPendingDevice = Boolean(pendingBinding?.device_id)
     return (
       <View className='device-page'>
         <View className='page-header'>
@@ -334,10 +338,14 @@ export default function Device() {
           <View className='empty-robot'>
             <Image className='robot-img' src={require('../../assets/tab-icons/robot.png')} mode='aspectFit' />
           </View>
-          <Text className='empty-title'>先绑定一台伴伴设备</Text>
+          <Text className='empty-title'>{hasPendingDevice ? '设备已绑定，待关联孩子' : '先绑定一台伴伴设备'}</Text>
-          <Text className='empty-subtitle'>绑定时可以选择已有孩子，或直接新建孩子昵称</Text>
+          <Text className='empty-subtitle'>
-          <View className='empty-btn' onClick={() => Taro.navigateTo({ url: '/pages/bind/index' })}>
+            {hasPendingDevice
-            <Text className='empty-btn-text'>添加设备</Text>
+              ? '这台设备还没有关联孩子，关联后即可查看定位、聊天和设备状态'
+              : '绑定时可以选择已有孩子，或直接新建孩子昵称'}
+          </Text>
+          <View className='empty-btn' onClick={() => Taro.navigateTo({ url: hasPendingDevice ? '/pages/bind/index?mode=assign' : '/pages/bind/index' })}>
+            <Text className='empty-btn-text'>{hasPendingDevice ? '关联孩子' : '添加设备'}</Text>
           </View>
         </View>
         {systemBanner}
@@ -346,6 +354,7 @@ export default function Device() {
   }
 
   if (!binding) {
+    const hasPendingDevice = Boolean(pendingBinding?.device_id)
     return (
       <View className='device-page'>
         <View className='page-header'>
@@ -366,10 +375,14 @@ export default function Device() {
           <View className='empty-robot'>
             <Image className='robot-img' src={require('../../assets/tab-icons/robot.png')} mode='aspectFit' />
           </View>
-          <Text className='empty-title'>给当前孩子绑定一台设备</Text>
+          <Text className='empty-title'>{hasPendingDevice ? '有设备待关联' : '给当前孩子绑定一台设备'}</Text>
-          <Text className='empty-subtitle'>绑定后，这个孩子的聊天记录、定位和设备状态都会显示在首页</Text>
+          <Text className='empty-subtitle'>
-          <View className='empty-btn' onClick={() => Taro.navigateTo({ url: '/pages/bind/index' })}>
+            {hasPendingDevice
-            <Text className='empty-btn-text'>去绑定设备</Text>
+              ? `设备 ${pendingBinding?.device_id} 还没有关联孩子，可以关联到当前孩子`
+              : '绑定后，这个孩子的聊天记录、定位和设备状态都会显示在首页'}
+          </Text>
+          <View className='empty-btn' onClick={() => Taro.navigateTo({ url: hasPendingDevice ? '/pages/bind/index?mode=assign' : '/pages/bind/index' })}>
+            <Text className='empty-btn-text'>{hasPendingDevice ? '关联到当前孩子' : '去绑定设备'}</Text>
           </View>
         </View>
         {systemBanner}

banban-mini/src/services/binding.ts

@@ -54,6 +54,7 @@ export interface BindingCardGroupListResponse {
 export interface BindingChildContext {
   currentChild: Child | null
   currentBinding: Binding | null
+  pendingBinding: Binding | null
 }
 
 export interface DirectBindPayload {
@@ -253,9 +254,23 @@ export function resolveBindingForChild<T extends { child_id: number | null }>(
   return childBindings[0] || null
 }
 
+export function resolveUnassignedBinding<T extends { child_id: number | null; device_id: string }>(items: T[]): T | null {
+  const unassignedBindings = items.filter((item) => item.device_id && item.child_id === null)
+  if (unassignedBindings.length === 0) return null
+
+  const selectedDeviceId = getSelectedBindingDeviceId()
+  if (selectedDeviceId) {
+    const selectedBinding = unassignedBindings.find((item) => item.device_id === selectedDeviceId) || null
+    if (selectedBinding) return selectedBinding
+  }
+
+  return unassignedBindings[0] || null
+}
+
 export function syncChildAndBindingSelection(children: Child[], bindings: Binding[]): BindingChildContext {
   const currentChild = resolveChildSelection(children)
-  const currentBinding = currentChild ? resolveBindingForChild(bindings, currentChild.child_id) : null
+  const childBinding = currentChild ? resolveBindingForChild(bindings, currentChild.child_id) : null
+  const unassignedBinding = resolveUnassignedBinding(bindings)
 
   if (currentChild) {
     setSelectedChildId(currentChild.child_id)
@@ -263,15 +278,18 @@ export function syncChildAndBindingSelection(children: Child[], bindings: Bindin
     clearSelectedChildId()
   }
 
-  if (currentBinding?.device_id) {
+  if (childBinding?.device_id) {
-    setSelectedBindingDeviceId(currentBinding.device_id)
+    setSelectedBindingDeviceId(childBinding.device_id)
+  } else if (unassignedBinding?.device_id) {
+    setSelectedBindingDeviceId(unassignedBinding.device_id)
   } else {
     clearSelectedBindingDeviceId()
   }
 
   return {
     currentChild,
-    currentBinding,
+    currentBinding: childBinding,
+    pendingBinding: unassignedBinding,
   }
 }
 
@@ -280,16 +298,18 @@ export async function loadCurrentChildBindingContext(): Promise<{
   bindings: Binding[]
   currentChild: Child | null
   currentBinding: Binding | null
+  pendingBinding: Binding | null
 }> {
   const [childResponse, bindingResponse] = await Promise.all([getChildren(undefined, 100), getBindings(undefined, 100)])
   const children = childResponse.items || []
   const bindings = bindingResponse.items || []
-  const { currentChild, currentBinding } = syncChildAndBindingSelection(children, bindings)
+  const { currentChild, currentBinding, pendingBinding } = syncChildAndBindingSelection(children, bindings)
 
   return {
     children,
     bindings,
     currentChild,
     currentBinding,
+    pendingBinding,
   }
 }