Merge pull request #1 from theshiftstudio/tudor/account-flow

Having fun with FirebaseAuthUI, Workflows & Compose. YAY!

app/build.gradle.kts

@@ -6,6 +6,8 @@ plugins {
     kotlin("plugin.serialization")
 
     id("dagger.hilt.android.plugin")
+
+    // id("com.google.gms.google-services")
 }
 
 android {
@@ -105,8 +107,6 @@ dependencies {
 
     implementation(COIL.compose)
 
-    // implementation("com.squareup.workflow1:workflow-ui-core-android:_")
-    // implementation(Dependencies.Square.Workflow.uiCoreAndroid)
     implementation(Dependencies.Square.Workflow.compose)
     implementation(Dependencies.Square.Workflow.composeTooling)
 
@@ -115,6 +115,10 @@ dependencies {
     implementation(AndroidX.lifecycle.viewModelCompose)
     implementation(AndroidX.lifecycle.viewModelSavedState)
 
+    implementation(platform(Firebase.bom))
+    implementation(Firebase.authenticationKtx)
+    implementation(Dependencies.Firebase.uiAuth)
+
     debugImplementation(Square.leakCanary.android)
 
     testImplementation(Testing.junit4)

app/src/main/AndroidManifest.xml

@@ -3,16 +3,20 @@
     package="com.shiftstudio.workflowshenanigans">
 
     <application
-        android:allowBackup="true"
+        android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
+        android:name=".infrastructure.ShenanigansApplication"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.WorkflowShenanigans">
+
         <activity
-            android:name=".MainActivity"
+            android:name=".infrastructure.MainActivity"
+            android:configChanges="colorMode|density|fontScale|keyboard|keyboardHidden|layoutDirection|locale|mcc|mnc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|touchscreen|uiMode"
             android:exported="true"
             android:label="@string/app_name"
+            android:launchMode="singleTask"
             android:theme="@style/Theme.WorkflowShenanigans.NoActionBar">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/com/shiftstudio/workflowshenanigans/ShenanigansModule.kt

@@ -0,0 +1,14 @@
+package com.shiftstudio.workflowshenanigans
+
+import dagger.Binds
+import dagger.Module
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+abstract class ShenanigansModule {
+
+    @Binds
+    abstract fun bindShenanigansWorkflow(impl: ShenanigansWorkflowImpl): ShenanigansWorkflow
+}

app/src/main/java/com/shiftstudio/workflowshenanigans/ShenanigansWorkflow.kt

@@ -0,0 +1,97 @@
+@file:OptIn(WorkflowUiExperimentalApi::class)
+
+package com.shiftstudio.workflowshenanigans
+
+import androidx.activity.ComponentActivity
+import com.shiftstudio.workflowshenanigans.ShenanigansWorkflow.ActivityAndProps
+import com.shiftstudio.workflowshenanigans.account.AccountViewRegistry
+import com.shiftstudio.workflowshenanigans.account.AccountWorkflow
+import com.shiftstudio.workflowshenanigans.login.LoginViewRegistry
+import com.shiftstudio.workflowshenanigans.welcome.WelcomeWorkflow
+import com.squareup.workflow1.Snapshot
+import com.squareup.workflow1.StatefulWorkflow
+import com.squareup.workflow1.Workflow
+import com.squareup.workflow1.action
+import com.squareup.workflow1.parse
+import com.squareup.workflow1.ui.NamedViewFactory
+import com.squareup.workflow1.ui.ViewRegistry
+import com.squareup.workflow1.ui.WorkflowUiExperimentalApi
+import com.squareup.workflow1.ui.backstack.BackStackContainer
+import com.squareup.workflow1.ui.backstack.BackStackScreen
+import com.squareup.workflow1.ui.backstack.toBackStackScreen
+import com.squareup.workflow1.ui.plus
+import javax.inject.Inject
+
+interface ShenanigansWorkflow : Workflow<ActivityAndProps<Unit>, Nothing, BackStackScreen<Any>> {
+
+    data class ActivityAndProps<R>(
+        val activity: ComponentActivity,
+        val props: R
+    )
+}
+
+val ShenanigansViewRegistry: ViewRegistry = ViewRegistry(BackStackContainer, NamedViewFactory) +
+    AccountViewRegistry +
+    LoginViewRegistry
+
+class ShenanigansWorkflowImpl @Inject constructor(
+    private val welcomeWorkflow: WelcomeWorkflow,
+    private val accountWorkflow: AccountWorkflow,
+) : ShenanigansWorkflow,
+    StatefulWorkflow<ActivityAndProps<Unit>, ShenanigansWorkflowImpl.State, Nothing, BackStackScreen<Any>>() {
+
+    sealed class State {
+        object Welcome : State()
+
+        object Account : State()
+    }
+
+    override fun initialState(props: ActivityAndProps<Unit>, snapshot: Snapshot?): State {
+        return snapshot?.bytes
+            ?.parse { source -> if (source.readInt() == 0) State.Welcome else State.Account }
+            ?: State.Welcome
+    }
+
+    override fun render(
+        renderProps: ActivityAndProps<Unit>,
+        renderState: State,
+        context: RenderContext
+    ): BackStackScreen<Any> {
+        val backStack = mutableListOf<Any>()
+
+        val welcomeScreen = context.renderChild(welcomeWorkflow, Unit) { output ->
+            handleWelcomeOutput(output)
+        }
+        backStack += welcomeScreen
+
+        when (renderState) {
+            is State.Welcome -> {
+                // We always add the welcome screen to the backstack, so this is a no op.
+            }
+            is State.Account -> {
+                val accountScreen = context.renderChild(accountWorkflow, renderProps) {
+                    goToWelcome()
+                }
+                backStack += accountScreen
+            }
+        }
+
+        return backStack.toBackStackScreen()
+    }
+
+    private fun handleWelcomeOutput(output: WelcomeWorkflow.Output) = action {
+        when (output) {
+            is WelcomeWorkflow.Output.GoToAccount -> {
+                state = State.Account
+            }
+        }
+    }
+
+    private fun goToWelcome() = action {
+        state = State.Welcome
+    }
+
+    override fun snapshotState(state: State): Snapshot {
+        return Snapshot.of(if (state == State.Welcome) 0 else 1)
+    }
+}

app/src/main/java/com/shiftstudio/workflowshenanigans/account/AccountModule.kt

@@ -0,0 +1,14 @@
+package com.shiftstudio.workflowshenanigans.account
+
+import dagger.Binds
+import dagger.Module
+import dagger.hilt.InstallIn
+import dagger.hilt.components.SingletonComponent
+
+@Module
+@InstallIn(SingletonComponent::class)
+abstract class AccountModule {
+
+    @Binds
+    abstract fun bindAccountWorkflow(impl: AccountWorkflowImpl): AccountWorkflow
+}

app/src/main/java/com/shiftstudio/workflowshenanigans/account/AccountScreen.kt

@@ -0,0 +1,44 @@
+@file:OptIn(WorkflowUiExperimentalApi::class)
+
+package com.shiftstudio.workflowshenanigans.account
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.height
+import androidx.compose.material.Button
+import androidx.compose.material.CircularProgressIndicator
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Surface
+import androidx.compose.material.Text
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.unit.dp
+import com.squareup.workflow1.ui.ViewRegistry
+import com.squareup.workflow1.ui.WorkflowUiExperimentalApi
+import com.squareup.workflow1.ui.compose.composeViewFactory
+
+private val LoadingUserBinding = composeViewFactory<LoadingUserRendering> { _, _ ->
+    Surface(color = MaterialTheme.colors.background) {
+        Column(
+            modifier = Modifier.fillMaxSize(),
+            verticalArrangement = Arrangement.Center,
+            horizontalAlignment = Alignment.CenterHorizontally
+        ) {
+            CircularProgressIndicator()
+        }
+    }
+}
+
+private val UserRenderingBinding = composeViewFactory<UserRendering> { rendering, _ ->
+    Column(horizontalAlignment = Alignment.CenterHorizontally) {
+        Text(text = rendering.user.name)
+        Spacer(modifier = Modifier.height(16.dp))
+        Button(onClick = { rendering.onSignOut() }) {
+            Text(text = "Sign out")
+        }
+    }
+}
+
+val AccountViewRegistry = ViewRegistry(LoadingUserBinding, UserRenderingBinding)