Add TriggerViewModel and Trigger component

android/nativebrik/src/main/java/com/nativebrik/sdk/component/trigger.kt

@@ -0,0 +1,58 @@
+package com.nativebrik.sdk.component
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.mutableStateListOf
+import androidx.lifecycle.ViewModel
+import com.nativebrik.sdk.NativebrikEvent
+import com.nativebrik.sdk.data.Container
+import com.nativebrik.sdk.schema.TriggerEventNameDefs
+import com.nativebrik.sdk.schema.UIBlock
+import com.nativebrik.sdk.schema.UIRootBlock
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+
+class TriggerViewModel(internal val container: Container) : ViewModel() {
+    internal val modalStacks = mutableStateListOf<UIRootBlock>()
+
+    fun dispatch(event: NativebrikEvent) {
+        val self = this
+        GlobalScope.launch(Dispatchers.IO) {
+            self.container.fetchInAppMessage(event.name).onSuccess {
+                GlobalScope.launch(Dispatchers.Main) {
+                    if (it is UIBlock.UnionUIRootBlock) {
+                        self.modalStacks.add(it.data)
+                    }
+                }
+            }
+        }
+    }
+
+    fun handleDismiss(root: UIRootBlock) {
+        modalStacks.removeIf {
+            it.id == root.id
+        }
+    }
+
+}
+
+@Composable
+fun Trigger(trigger: TriggerViewModel) {
+    LaunchedEffect("") {
+        trigger.dispatch(NativebrikEvent(TriggerEventNameDefs.USER_BOOT_APP.name))
+    }
+
+    if (trigger.modalStacks.isNotEmpty()) {
+        for (stack in trigger.modalStacks) {
+            Root(
+                container = trigger.container,
+                root = stack,
+                embeddingVisibility = false,
+                onDismiss = {
+                    trigger.handleDismiss(it)
+                }
+            )
+        }
+    }
+}

android/nativebrik/src/main/java/com/nativebrik/sdk/sdk.kt

@@ -18,19 +18,25 @@ import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import com.nativebrik.sdk.component.Embedding
 import com.nativebrik.sdk.component.EmbeddingLoadingState
+import com.nativebrik.sdk.component.Trigger
+import com.nativebrik.sdk.component.TriggerViewModel
 import com.nativebrik.sdk.data.Container
 import com.nativebrik.sdk.data.ContainerImpl
 import com.nativebrik.sdk.data.user.NativebrikUser
 
 data class Endpoint(
     val cdn: String = "https://cdn.nativebrik.com",
     val track: String = "https://track.nativebrik.com/track/v1",
-) {}
+)
 
 data class Config(
     val projectId: String,
     val endpoint: Endpoint = Endpoint()
-) {}
+)
+
+data class NativebrikEvent(
+    val name: String
+)
 
 internal var LocalNativebrikClient = compositionLocalOf<NativebrikClient> {
     error("NativebrikClient is not found")
@@ -54,6 +60,7 @@ public fun NativebrikProvider(
     CompositionLocalProvider(
         LocalNativebrikClient provides client
     ) {
+        client.experiment.Overlay()
         content()
     }
 }
@@ -77,15 +84,25 @@ public class NativebrikClient {
 
 public class NativebrikExperiment {
     private val container: Container
+    private val trigger: TriggerViewModel
+
     internal constructor(config: Config, user: NativebrikUser, context: Context) {
         this.container = ContainerImpl(
             config = config,
             user = user,
             context = context,
         )
+        this.trigger = TriggerViewModel(this.container)
+    }
+
+    public fun dispatch(event: NativebrikEvent) {
+        this.trigger.dispatch(event)
     }
 
-    public fun dispatch(name: String) {}
+    @Composable
+    public fun Overlay() {
+        Trigger(trigger = this.trigger)
+    }
 
     @Composable
     public fun Embedding(id: String, modifier: Modifier = Modifier) {