app/src/main/java/com/faraphel/tasks_valider/MainActivity.kt

@@ -13,7 +13,7 @@ import androidx.activity.compose.setContent
 import androidx.annotation.RequiresApi
 import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
 import com.faraphel.tasks_valider.database.Database
-import com.faraphel.tasks_valider.ui.screen.RoomScreen
+import com.faraphel.tasks_valider.ui.screen.room.RoomScreen
 
 
 class MainActivity : ComponentActivity() {

app/src/main/java/com/faraphel/tasks_valider/connectivity/wifi_p2p/WifiP2pHelper.kt

@@ -119,10 +119,7 @@ class WifiP2pHelper(
      *
      * Connect to another device, allowing for a communication using Sockets
      */
-    fun connect(deviceAddress: String, listener: WifiP2pManager.ActionListener? = null) {
-        val config = WifiP2pConfig().apply {
-            this.deviceAddress = deviceAddress
-        }
+    fun connect(config: WifiP2pConfig, listener: WifiP2pManager.ActionListener? = null) {
         this.manager.connect(this.channel, config, listener)
     }
 
@@ -162,4 +159,55 @@ class WifiP2pHelper(
     fun requestGroupInfo(listener: WifiP2pManager.GroupInfoListener? = null) {
         this.manager.requestGroupInfo(this.channel, listener)
     }
+
+    /**
+     * Wrapper around WifiP2pManager::createGroup
+     *
+     * Create a new WiFi-Direct group.
+     */
+    fun createGroup(listener: WifiP2pManager.ActionListener? = null) {
+        this.manager.createGroup(this.channel, listener)
+    }
+
+    /**
+     * Wrapper around WifiP2pManager::removeGroup
+     *
+     * Disconnect from the current WiFi-Direct group.
+     */
+    fun removeGroup(listener: WifiP2pManager.ActionListener? = null) {
+        this.manager.removeGroup(this.channel, listener)
+    }
+
+    /**
+     * Create a new WiFi-Direct group.
+     * If already connected to a group, quit it first.
+     *
+     * @param listener: the createGroup listener
+     * @param onFailure: error handler for the removeGroup event
+     */
+    fun recreateGroup(
+        listener: WifiP2pManager.ActionListener? = null,
+        onFailure: ((Int) -> Unit)? = null
+    ) {
+        // get the current group information
+        this.requestGroupInfo { group ->
+            // if a group exist, quit it
+            if (group != null)
+                this.removeGroup(object : WifiP2pManager.ActionListener {
+                    override fun onSuccess() {
+                        // once left, create the group
+                        this@WifiP2pHelper.createGroup(listener)
+                    }
+
+                    override fun onFailure(reason: Int) {
+                        // call the handler
+                        onFailure?.invoke(reason)
+                    }
+
+                })
+            else
+                // create the group
+                this.createGroup(listener)
+        }
+    }
 }

app/src/main/java/com/faraphel/tasks_valider/ui/screen/room/RoomClientScreen.kt

@@ -1,17 +1,19 @@
-package com.faraphel.tasks_valider.ui.screen
+package com.faraphel.tasks_valider.ui.screen.room
 
 import android.net.wifi.p2p.WifiP2pDeviceList
 import android.net.wifi.p2p.WifiP2pManager
 import androidx.compose.foundation.layout.Column
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
 import com.faraphel.tasks_valider.ui.widgets.connectivity.WifiP2pDeviceListWidget
 
 
+/**
+ * This screen allow the user to join a room
+ */
 @Composable
 fun RoomClientScreen(wifiP2pHelper: WifiP2pHelper) {
     val peers = remember { mutableStateOf<WifiP2pDeviceList?>(null) }

app/src/main/java/com/faraphel/tasks_valider/ui/screen/room/RoomHostScreen.kt

@@ -0,0 +1,61 @@
+package com.faraphel.tasks_valider.ui.screen.room
+
+import android.net.wifi.p2p.WifiP2pManager
+import android.util.Log
+import androidx.compose.foundation.layout.Column
+import androidx.compose.material3.*
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
+import com.faraphel.tasks_valider.ui.screen.tasks.TaskGroupScreen
+
+
+/**
+ * This screen allow the user to create a room
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun RoomHostScreen(wifiP2pHelper: WifiP2pHelper) {
+    val expanded = remember { mutableStateOf(false) }
+    val isCreated = remember { mutableStateOf(false) }
+
+    // if the group have been created, display the group screen
+    if (isCreated.value) {
+        TaskGroupScreen()
+        return
+    }
+
+    Column {
+        ExposedDropdownMenuBox(
+            expanded = expanded.value,
+            onExpandedChange = { value -> expanded.value = !value }
+        ) {
+            DropdownMenuItem(
+                text = { Text("ISRI") },
+                onClick = {}
+            )
+            DropdownMenuItem(
+                text = { Text("MIAGE") },
+                onClick = {}
+            )
+        }
+
+        Button(onClick = {
+            // create a new WiFi-Direct group
+            wifiP2pHelper.recreateGroup(object : WifiP2pManager.ActionListener {
+                override fun onSuccess() {
+                    Log.i("room", "group created !")
+                    // mark the group as created
+                    isCreated.value = true
+                }
+                override fun onFailure(reason: Int) {
+                    Log.e("room", "error while creating group. Reason: $reason")
+                }
+            })
+        }) {
+            Text("Create")
+        }
+    }
+
+}

app/src/main/java/com/faraphel/tasks_valider/ui/screen/room/RoomScreen.kt

@@ -1,4 +1,4 @@
-package com.faraphel.tasks_valider.ui.screen
+package com.faraphel.tasks_valider.ui.screen.room
 
 import androidx.compose.foundation.layout.Column
 import androidx.compose.material3.Button
@@ -10,7 +10,6 @@ import com.faraphel.tasks_valider.connectivity.wifi_p2p.WifiP2pHelper
 
 
 enum class RoomScreenType {
-    UNDEFINED,
     HOST,
     CLIENT
 }
@@ -21,24 +20,28 @@ enum class RoomScreenType {
  */
 @Composable
 fun RoomScreen(wifiP2pHelper: WifiP2pHelper) {
-    val roomMode = remember { mutableStateOf(RoomScreenType.UNDEFINED) }
+    val roomMode = remember { mutableStateOf<RoomScreenType?>(null) }
 
     when (roomMode.value) {
-        RoomScreenType.UNDEFINED -> Column {
-            Button(onClick = { roomMode.value = RoomScreenType.CLIENT }) {
-                Text(text = "Join a room")
-            }
-            Button(onClick = { roomMode.value = RoomScreenType.HOST }) {
-                Text(text = "Create a room")
-            }
-        }
         RoomScreenType.CLIENT -> {
             // Client mode
             RoomClientScreen(wifiP2pHelper)
         }
         RoomScreenType.HOST -> {
             // Host mode
-            TODO("Faraphel: host mode not implemented")
+            RoomHostScreen(wifiP2pHelper)
+        }
+
+        null -> {
+            // let the user decide which room mode he which to use
+            Column {
+                Button(onClick = { roomMode.value = RoomScreenType.CLIENT }) {
+                    Text(text = "Join a room")
+                }
+                Button(onClick = { roomMode.value = RoomScreenType.HOST }) {
+                    Text(text = "Create a room")
+                }
+            }
         }
     }
-}
+}

app/src/main/java/com/faraphel/tasks_valider/ui/screen/tasks/TaskGroupScreen.kt

@@ -0,0 +1,13 @@
+package com.faraphel.tasks_valider.ui.screen.tasks
+
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+
+
+/**
+ * This screen let the user decide which student team he wants to interact with
+ */
+@Composable
+fun TaskGroupScreen() {
+    Text(text = "Task Group")
+}