Added connection to the api (login only)

app/build.gradle.kts

@@ -54,7 +54,7 @@ dependencies {
     implementation("androidx.core:core-ktx:1.12.0")
     implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
     implementation("androidx.activity:activity-compose:1.8.2")
-    implementation(platform("androidx.compose:compose-bom:2024.02.01"))
+    implementation(platform("androidx.compose:compose-bom:2024.04.00"))
     implementation("androidx.compose.ui:ui")
     implementation("androidx.compose.ui:ui-graphics")
     implementation("androidx.compose.ui:ui-tooling-preview")
@@ -62,7 +62,7 @@ dependencies {
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
-    androidTestImplementation(platform("androidx.compose:compose-bom:2024.02.01"))
+    androidTestImplementation(platform("androidx.compose:compose-bom:2024.04.00"))
     androidTestImplementation("androidx.compose.ui:ui-test-junit4")
     debugImplementation("androidx.compose.ui:ui-tooling")
     debugImplementation("androidx.compose.ui:ui-test-manifest")
@@ -71,11 +71,16 @@ dependencies {
     implementation("io.github.raamcosta.compose-destinations:core:1.0.2-beta")
     ksp("io.github.raamcosta.compose-destinations:ksp:1.0.2-beta")
 
-    implementation("androidx.compose.material:material-icons-extended:1.6.2")
+    implementation("androidx.compose.material:material-icons-extended:1.6.5")
 
     implementation("com.google.accompanist:accompanist-permissions:0.34.0")
-    implementation("androidx.camera:camera-camera2:1.3.1")
+    implementation("androidx.camera:camera-camera2:1.3.2")
-    implementation("androidx.camera:camera-lifecycle:1.3.1")
+    implementation("androidx.camera:camera-lifecycle:1.3.2")
-    implementation("androidx.camera:camera-view:1.3.1")
+    implementation("androidx.camera:camera-view:1.3.2")
     implementation("com.google.mlkit:barcode-scanning:17.2.0")
+
+    implementation("com.squareup.retrofit2:retrofit:2.11.0")
+    implementation("com.squareup.retrofit2:converter-gson:2.11.0")
+    implementation("com.squareup.okhttp3:okhttp:5.0.0-alpha.12")
+    implementation("com.squareup.okhttp3:logging-interceptor:5.0.0-alpha.12")
 }

app/src/main/AndroidManifest.xml

@@ -6,6 +6,8 @@
     <uses-feature android:name="android.hardware.camera.autofocus"/>
     <uses-permission android:name="android.permission.CAMERA"/>
 
+    <uses-permission android:name="android.permission.INTERNET"/>
+
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/it/edu/cassandroferminervi/flowschool/remote/ApiService.kt

@@ -0,0 +1,13 @@
+package it.edu.cassandroferminervi.flowschool.remote
+
+import it.edu.cassandroferminervi.flowschool.remote.dto.LoginResult
+import retrofit2.Response
+import retrofit2.http.Field
+import retrofit2.http.FormUrlEncoded
+import retrofit2.http.POST
+
+interface ApiService {
+    @FormUrlEncoded
+    @POST("login.php")
+    suspend fun postLogin(@Field("username") code: String, @Field("password") password: String): Response<LoginResult>
+}

app/src/main/java/it/edu/cassandroferminervi/flowschool/remote/RetrofitInstance.kt

@@ -0,0 +1,23 @@
+package it.edu.cassandroferminervi.flowschool.remote
+
+import okhttp3.OkHttpClient
+import okhttp3.logging.HttpLoggingInterceptor
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+
+object RetrofitInstance {
+    private val client = OkHttpClient.Builder()
+        .addInterceptor(HttpLoggingInterceptor().apply {
+            level = HttpLoggingInterceptor.Level.BODY
+        })
+        .build()
+
+    val api: ApiService by lazy {
+        Retrofit.Builder()
+            .baseUrl("https://flowschool.riefolo.me/api/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .client(client)
+            .build()
+            .create(ApiService::class.java)
+    }
+}

app/src/main/java/it/edu/cassandroferminervi/flowschool/remote/dto/LoginResult.kt

@@ -0,0 +1,3 @@
+package it.edu.cassandroferminervi.flowschool.remote.dto
+
+data class LoginResult(val token: String?, val error: String?)

app/src/main/java/it/edu/cassandroferminervi/flowschool/screens/HomeScreen.kt

@@ -19,7 +19,7 @@ import com.ramcosta.composedestinations.navigation.DestinationsNavigator
 
 @Destination
 @Composable
-fun HomeScreen(navigator: DestinationsNavigator) {
+fun HomeScreen(navigator: DestinationsNavigator, token: String) {
     Column(
         verticalArrangement = Arrangement.Center,
         modifier = Modifier
@@ -27,13 +27,13 @@ fun HomeScreen(navigator: DestinationsNavigator) {
             .padding(horizontal = 50.dp)
     ) {
         Button(onClick = {
-            navigator.navigate(PermissionScreenDestination)
+            navigator.navigate(PermissionScreenDestination(token))
         }, modifier = Modifier.align(Alignment.CenterHorizontally)) {
             Text("Scannerizza codice QR")
         }
         Spacer(modifier = Modifier.height(8.dp))
         Button(onClick = {
-            navigator.navigate(SearchingScreenDestination)
+            navigator.navigate(SearchingScreenDestination(token))
         }, modifier = Modifier.align(Alignment.CenterHorizontally)) {
             Text("Cerca professore")
         }

app/src/main/java/it/edu/cassandroferminervi/flowschool/screens/LoginScreen.kt

@@ -1,5 +1,6 @@
 package it.edu.cassandroferminervi.flowschool.screens
 
+import android.widget.Toast
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
@@ -23,10 +24,12 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.text.input.PasswordVisualTransformation
@@ -36,6 +39,9 @@ import com.ramcosta.composedestinations.HomeScreenDestination
 import com.ramcosta.composedestinations.annotation.Destination
 import com.ramcosta.composedestinations.navigation.DestinationsNavigator
 import it.edu.cassandroferminervi.flowschool.R
+import it.edu.cassandroferminervi.flowschool.remote.RetrofitInstance
+import kotlinx.coroutines.launch
+
 
 @Destination(start = true)
 @Composable
@@ -44,6 +50,9 @@ fun LoginScreen(navigator: DestinationsNavigator) {
     var password by remember { mutableStateOf("") }
     var passwordVisible by remember { mutableStateOf(false) }
 
+    val coroutineScope = rememberCoroutineScope()
+    val context = LocalContext.current
+
     Column(
         verticalArrangement = Arrangement.Center,
         modifier = Modifier
@@ -62,7 +71,7 @@ fun LoginScreen(navigator: DestinationsNavigator) {
         TextField(
             value = code,
             onValueChange = { code = it },
-            label = { Text("Codice") },
+            label = { Text("Username") },
             singleLine = true,
             modifier = Modifier.fillMaxWidth()
         )
@@ -89,7 +98,17 @@ fun LoginScreen(navigator: DestinationsNavigator) {
         )
         Spacer(modifier = Modifier.height(8.dp))
         Button(onClick = {
-            navigator.navigate(HomeScreenDestination)
+            coroutineScope.launch {
+                val response = RetrofitInstance.api.postLogin(code, password)
+                val loginResult = response.body()
+
+                if (!response.isSuccessful || loginResult == null)
+                    Toast.makeText(context, "Errore del server", Toast.LENGTH_LONG).show()
+                else if (!loginResult.token.isNullOrEmpty() && loginResult.error.isNullOrEmpty())
+                    navigator.navigate(HomeScreenDestination(loginResult.token))
+                else
+                    Toast.makeText(context, loginResult.error, Toast.LENGTH_LONG).show()
+            }
         }, modifier = Modifier.align(Alignment.End)) {
             Text("Accedi")
         }

app/src/main/java/it/edu/cassandroferminervi/flowschool/screens/PermissionScreen.kt

@@ -16,7 +16,7 @@ import com.ramcosta.composedestinations.annotation.Destination
 @OptIn(ExperimentalPermissionsApi::class)
 @Destination
 @Composable
-fun PermissionScreen() {
+fun PermissionScreen(token: String) {
     val cameraPermissionState = rememberPermissionState(android.Manifest.permission.CAMERA)
 
     if (cameraPermissionState.status.isGranted) {

app/src/main/java/it/edu/cassandroferminervi/flowschool/screens/SearchingScreen.kt

@@ -26,7 +26,7 @@ import com.ramcosta.composedestinations.navigation.DestinationsNavigator
 
 @Destination
 @Composable
-fun SearchingScreen(navigator: DestinationsNavigator) {
+fun SearchingScreen(navigator: DestinationsNavigator, token: String) {
     val teachers = listOf(
         "Mario Rossi",
         "Michele Verdi",