Merge pull request #13 from Faraphel/menu-v1

Liste de cartes

.gitignore

@@ -1,15 +1,9 @@
 *.iml
 .gradle
-/local.properties
+local.properties
-/.idea/caches
+.idea
-/.idea/libraries
-/.idea/modules.xml
-/.idea/workspace.xml
-/.idea/navEditor.xml
-/.idea/assetWizardSettings.xml
 .DS_Store
-/build
+build
-/captures
 .externalNativeBuild
 .cxx
 local.properties

.idea/.gitignore

@@ -1,3 +0,0 @@
-# Default ignored files
-/shelf/
-/workspace.xml

.idea/.name

@@ -1 +0,0 @@
-Palto

.idea/compiler.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="17" />
-  </component>
-</project>

.idea/gradle.xml

@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="GradleMigrationSettings" migrationVersion="1" />
-  <component name="GradleSettings">
-    <option name="linkedExternalProjectsSettings">
-      <GradleProjectSettings>
-        <option name="testRunner" value="GRADLE" />
-        <option name="distributionType" value="DEFAULT_WRAPPED" />
-        <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="jbr-17" />
-        <option name="modules">
-          <set>
-            <option value="$PROJECT_DIR$" />
-            <option value="$PROJECT_DIR$/app" />
-          </set>
-        </option>
-      </GradleProjectSettings>
-    </option>
-  </component>
-</project>

.idea/kotlinc.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="KotlinJpsPluginSettings">
-    <option name="version" value="1.9.0" />
-  </component>
-</project>

.idea/misc.xml

@@ -1,6 +0,0 @@
-<project version="4">
-  <component name="ExternalStorageConfigurationManager" enabled="true" />
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/out" />
-  </component>
-</project>

.idea/vcs.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="" vcs="Git" />
-  </component>
-</project>

app/build.gradle.kts

@@ -30,14 +30,23 @@ android {
         jvmTarget = "1.8"
     }
     buildToolsVersion = "33.0.1"
+    buildFeatures {
+        viewBinding = true
+    }
 }
 
 dependencies {
-
     implementation("androidx.core:core-ktx:1.12.0")
     implementation("androidx.appcompat:appcompat:1.6.1")
     implementation("com.google.android.material:material:1.10.0")
     implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    implementation("androidx.navigation:navigation-fragment-ktx:2.7.5")
+    implementation("androidx.navigation:navigation-ui-ktx:2.7.5")
+    implementation("androidx.annotation:annotation:1.7.0")
+    implementation("androidx.lifecycle:lifecycle-livedata-ktx:2.6.2")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.2")
+    implementation("androidx.legacy:legacy-support-v4:1.0.0")
+    implementation("androidx.recyclerview:recyclerview:1.3.0")
     testImplementation("junit:junit:4.13.2")
     androidTestImplementation("androidx.test.ext:junit:1.1.5")
     androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")

app/src/main/AndroidManifest.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+<manifest
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
     <uses-permission android:name="android.permission.NFC" />
@@ -16,14 +17,20 @@
         android:theme="@style/Theme.Palto"
         tools:targetApi="31">
         <activity
-            android:name=".MainActivity"
+            android:name=".PaltoActivity"
-            android:exported="true" >
+            android:exported="true"
+            android:launchMode="singleTop">
 
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
 
+            <intent-filter>
+                <action android:name="android.nfc.action.TAG_DISCOVERED"/>
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+
         </activity>
     </application>
 

app/src/main/java/com/example/palto/PaltoActivity.kt

@@ -1,48 +1,50 @@
 package com.example.palto
 
-import android.app.PendingIntent
-import android.content.Intent
-import android.content.IntentFilter
 import android.nfc.NfcAdapter
 import android.nfc.Tag
-import android.nfc.tech.IsoDep
-import android.nfc.tech.NdefFormatable
-import android.nfc.tech.NfcA
-import android.os.Build
 import android.os.Bundle
 import android.util.Log
-import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
+import androidx.activity.viewModels
 
 
-class MainActivity : AppCompatActivity() {
+class PaltoActivity : AppCompatActivity() {
+
     private var nfcAdapter: NfcAdapter? = null
 
+    private val paltoViewModel: PaltoViewModel by viewModels()
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
 
         // get the NFC Adapter
-        this.nfcAdapter = NfcAdapter.getDefaultAdapter(this)
+        nfcAdapter = NfcAdapter.getDefaultAdapter(this)
 
         // check if NFC is supported
-        if (this.nfcAdapter == null) {
+        if (nfcAdapter == null) {
             Log.e("NFC", "NFC is not supported")
             return
         }
 
         // check if NFC is disabled
-        if (!(this.nfcAdapter!!.isEnabled)) {
+        if (nfcAdapter?.isEnabled == false) {
             Log.w("NFC", "NFC is not enabled")
         }
+
+        setContentView(R.layout.activity_palto)
+        /*
+        val url = URL("https://www.faraphel.fr/palto/api/auth/token/")
+        val connection = url.openConnection()
+        val auth_data = Json.decodeFromString(connection.content)
+        */
     }
 
     override fun onResume() {
         super.onResume()
 
-        nfcAdapter!!.enableReaderMode(
+        nfcAdapter?.enableReaderMode(
             this,
-            this::processTag,
+            paltoViewModel.tagLiveData::postValue,
             NfcAdapter.FLAG_READER_NFC_A or NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK,
             null
         )
@@ -52,11 +54,11 @@ class MainActivity : AppCompatActivity() {
         super.onPause()
 
         // disable the NFC discovery
-        this.nfcAdapter!!.disableReaderMode(this)
+        nfcAdapter?.disableReaderMode(this)
     }
 
     @OptIn(ExperimentalStdlibApi::class)
     fun processTag(tag: Tag) {
-        Log.d("NFC", "Tag ID : ${tag.id.toHexString()}")
+        Log.d("NFC", "Tag ID : " + tag.id.toHexString())
     }
 }

app/src/main/java/com/example/palto/PaltoViewModel.kt

@@ -0,0 +1,9 @@
+package com.example.palto
+
+import android.nfc.Tag
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class PaltoViewModel: ViewModel() {
+    val tagLiveData = MutableLiveData<Tag>()
+}

app/src/main/java/com/example/palto/data/Result.kt

@@ -0,0 +1,18 @@
+package com.example.palto.data
+
+/**
+ * A generic class that holds a value with its loading status.
+ * @param <T>
+ */
+sealed class Result<out T : Any> {
+
+    data class Success<out T : Any>(val data: T) : Result<T>()
+    data class Error(val exception: Exception) : Result<Nothing>()
+
+    override fun toString(): String {
+        return when (this) {
+            is Success<*> -> "Success[data=$data]"
+            is Error -> "Error[exception=$exception]"
+        }
+    }
+}

app/src/main/java/com/example/palto/data/local/LocalDataSource.kt

@@ -0,0 +1,24 @@
+package com.example.palto.data.local
+
+/**
+ * Class that handles authentication w/ login credentials and retrieves user information.
+ */
+class LocalDataSource {
+    /*
+    fun login(username: String, password: String): Result<LoggedInUser> {
+        try {
+
+
+            val fakeUser = LoggedInUser(java.util.UUID.randomUUID().toString(), "Jane Doe")
+            return Result.Success(fakeUser)
+
+        } catch (e: Throwable) {
+            return Result.Error(IOException("Error logging in", e))
+        }
+    }
+
+    fun logout() {
+        // TODO: revoke authentication
+    }
+     */
+}

app/src/main/java/com/example/palto/data/network/ServerDataSource.kt

@@ -0,0 +1,60 @@
+package com.example.palto.data.network
+
+import com.example.palto.data.Result
+import com.example.palto.model.LoggedInUser
+import com.example.palto.model.Tokens
+import java.io.IOException
+import java.util.UUID
+
+/**
+ * Class that handles API calls.
+ */
+class ServerDataSource {
+
+    private var hostname: String? = null
+
+    fun requestToken(
+        hostname: String,
+        username: String,
+        password: String
+    ): Result<Tokens> {
+        try {
+            val tokens = Tokens(
+                refresh = "aa",
+                access = "bb"
+            )
+            return Result.Success(tokens)
+        } catch (e: Throwable) {
+            return Result.Error(IOException("Error logging in", e))
+        }
+    }
+
+    fun refreshToken(current_tokens: Tokens): Result<Tokens> {
+        return Result.Success(current_tokens)
+    }
+
+    fun verifyToken(): Boolean {
+        return true
+    }
+
+    fun login(
+        hostname: String,
+        username: String,
+        password: String
+    ): Result<LoggedInUser> {
+        try {
+            val fakeUser = LoggedInUser(
+                UUID.randomUUID().toString(),
+                "dede",
+                "Lucie",
+                "Doe",
+                "aa@free.fr",
+                )
+            return Result.Success(fakeUser)
+        } catch (e: Throwable) {
+            return Result.Error(IOException("Error logging in", e))
+        }
+    }
+
+    fun logout() { }
+}

app/src/main/java/com/example/palto/data/repository/AttendanceRepository.kt

@@ -0,0 +1,10 @@
+package com.example.palto.data.repository
+
+import com.example.palto.data.network.ServerDataSource
+
+/**
+ *
+ */
+class AttendanceRepository(val dataSource: ServerDataSource) {
+    // private val cards
+}

app/src/main/java/com/example/palto/data/repository/LoginRepository.kt

@@ -0,0 +1,47 @@
+package com.example.palto.data.repository
+
+import com.example.palto.data.Result
+import com.example.palto.data.network.ServerDataSource
+import com.example.palto.model.LoggedInUser
+
+/**
+ * Class that requests authentication and user information from the remote data source and
+ * maintains an in-memory cache of login status and user credentials information.
+ */
+
+class LoginRepository(val dataSource: ServerDataSource) {
+
+    var user: LoggedInUser? = null
+        private set
+
+    val isLoggedIn: Boolean
+        get() = user != null
+
+    init {
+        user = null
+    }
+
+    fun logout() {
+        user = null
+        dataSource.logout()
+    }
+
+    fun login(
+        hostname: String,
+        username: String,
+        password: String
+    ): Result<LoggedInUser> {
+        // handle login
+        val result = dataSource.login(hostname, username, password)
+
+        if (result is Result.Success) {
+            setLoggedInUser(result.data)
+        }
+
+        return result
+    }
+
+    private fun setLoggedInUser(loggedInUser: LoggedInUser) {
+        this.user = loggedInUser
+    }
+}

app/src/main/java/com/example/palto/data/repository/SessionRepository.kt

@@ -0,0 +1,10 @@
+package com.example.palto.data.repository
+
+import com.example.palto.data.network.ServerDataSource
+
+/**
+ *
+ */
+class SessionRepository(val dataSource: ServerDataSource) {
+    // private val cards
+}

app/src/main/java/com/example/palto/data/repository/TokensRepository.kt

@@ -0,0 +1,43 @@
+package com.example.palto.data.repository
+
+import com.example.palto.data.network.ServerDataSource
+import com.example.palto.model.Tokens
+
+/**
+ * Class that requests authentication and user information from the remote data source and
+ * maintains an in-memory cache of login status and user credentials information.
+ */
+
+class TokensRepository(val dataSource: ServerDataSource) {
+
+    var tokens: Tokens? = null
+        private set
+
+    /*
+    val isLoggedIn: Boolean
+        get() = user != null
+     */
+
+    init {
+        // If user credentials will be cached in local storage, it is recommended it be encrypted
+        // @see https://developer.android.com/training/articles/keystore
+        tokens = null
+    }
+
+    /*
+    fun login(username: String, password: String): Result<LoggedInUser> {
+        // handle login
+        val result = dataSource.login(username, password)
+
+        if (result is Result.Success) {
+            setLoggedInUser(result.data)
+        }
+
+        return result
+    }
+    */
+
+    private fun setTokens(tokens: Tokens) {
+        this.tokens = tokens
+    }
+}

app/src/main/java/com/example/palto/model/Attendance.kt

@@ -0,0 +1,10 @@
+package com.example.palto.model
+import java.io.Serializable
+
+/**
+ * Data class that captures tokens for logged in users retrieved from LoginRepository
+ */
+data class Attendance(
+    val date: String,
+    val access: String
+) : Serializable

app/src/main/java/com/example/palto/model/Card.kt

@@ -0,0 +1,23 @@
+package com.example.palto.model
+import java.io.Serializable
+
+data class Card(
+    val id: String,
+    val uid: ByteArray,
+    val department: String,
+    val owner: String
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Card
+
+        return uid.contentEquals(other.uid)
+    }
+
+    override fun hashCode(): Int {
+        return uid.contentHashCode()
+    }
+
+}

app/src/main/java/com/example/palto/model/LoggedInUser.kt

@@ -0,0 +1,14 @@
+package com.example.palto.model
+
+import java.io.Serializable
+
+/**
+ * Data class that captures user information for logged in users retrieved from LoginRepository
+ */
+data class LoggedInUser(
+    val id: String,
+    val username: String,
+    val first_name: String,
+    val last_name: String,
+    val email: String
+) : Serializable

app/src/main/java/com/example/palto/model/Session.kt

@@ -0,0 +1,9 @@
+package com.example.palto.model
+import java.io.Serializable
+
+/**
+ * Data class that captures tokens for logged in users retrieved from LoginRepository
+ */
+data class Session(
+    val id: String
+) : Serializable

app/src/main/java/com/example/palto/model/Tokens.kt

@@ -0,0 +1,10 @@
+package com.example.palto.model
+import java.io.Serializable
+
+/**
+ * Data class that captures tokens for logged in users retrieved from LoginRepository
+ */
+data class Tokens(
+    val refresh: String,
+    val access: String
+) : Serializable

app/src/main/java/com/example/palto/ui/attendanceList/AttendanceListAdapter.kt

@@ -0,0 +1,58 @@
+package com.example.palto.ui.attendanceList
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.example.palto.databinding.FragmentAttendanceItemBinding
+import com.example.palto.model.Card
+
+/**
+ *
+ */
+class AttendanceListAdapter :
+    ListAdapter<Card, AttendanceListAdapter.ViewHolder>(CardDiffCallback) {
+
+    override fun onCreateViewHolder(
+        parent: ViewGroup,
+        viewType: Int
+    ): ViewHolder {
+
+        return ViewHolder(
+            FragmentAttendanceItemBinding.inflate(
+                LayoutInflater.from(parent.context),
+                parent,
+                false
+            )
+        )
+    }
+
+    @OptIn(ExperimentalStdlibApi::class)
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val item = getItem(position)
+        holder.cardId.text = item.uid.toHexString()
+        //holder.contentView.text = item.content
+    }
+
+    inner class ViewHolder(
+        binding: FragmentAttendanceItemBinding
+    ) : RecyclerView.ViewHolder(binding.root) {
+
+        val cardId: TextView = binding.cardId
+        override fun toString(): String {
+            return super.toString() + " '" + cardId.text + "'"
+        }
+    }
+}
+
+object CardDiffCallback : DiffUtil.ItemCallback<Card>() {
+    override fun areItemsTheSame(oldItem: Card, newItem: Card): Boolean {
+        return oldItem == newItem
+    }
+
+    override fun areContentsTheSame(oldItem: Card, newItem: Card): Boolean {
+        return oldItem.id == newItem.id
+    }
+}

app/src/main/java/com/example/palto/ui/attendanceList/AttendanceListFragment.kt

@@ -0,0 +1,69 @@
+package com.example.palto.ui.attendanceList
+
+import android.nfc.NfcAdapter
+import android.nfc.Tag
+import android.os.Bundle
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
+import androidx.lifecycle.Observer
+import androidx.navigation.navGraphViewModels
+import com.example.palto.PaltoViewModel
+import com.example.palto.R
+import com.example.palto.databinding.FragmentAttendanceListBinding
+
+/**
+ * A fragment representing a list of attendances.
+ */
+class AttendanceListFragment : Fragment() {
+
+    private val attendanceListViewModel: AttendanceListViewModel by
+        navGraphViewModels(R.id.nav_graph) { AttendanceListViewModel.Factory }
+
+    private val paltoViewModel: PaltoViewModel by
+        activityViewModels()
+
+    private var _binding: FragmentAttendanceListBinding? = null
+    // This property is only valid between onCreateView and onDestroyView
+    private val binding get() = _binding!!
+
+    /**
+     * Only inflate the view.
+     */
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        _binding = FragmentAttendanceListBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    /**
+     * Logic on the returned view of onCreateView.
+     */
+    override fun onViewCreated(
+        view: View,
+        savedInstanceState: Bundle?
+    ) {
+        super.onViewCreated(view, savedInstanceState)
+
+        // Set the adapter of the view for managing automatically the list of items on the screen.
+        val adapter = AttendanceListAdapter()
+        binding.list.adapter = adapter
+        attendanceListViewModel.cardsLiveData.observe(viewLifecycleOwner) {
+            Log.d("NFC", "A card has been had to the list")
+            adapter.submitList(it)
+        }
+
+        // Set the listener for a new NFC tag.
+        paltoViewModel.tagLiveData.observe(viewLifecycleOwner) {
+            Log.d("NFC", "tag observer has been notified")
+            attendanceListViewModel.insertCard(it)
+        }
+    }
+}

app/src/main/java/com/example/palto/ui/attendanceList/AttendanceListViewModel.kt

@@ -0,0 +1,49 @@
+package com.example.palto.ui.attendanceList
+
+import android.nfc.Tag
+import android.util.Log
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import com.example.palto.data.network.ServerDataSource
+import com.example.palto.data.repository.AttendanceRepository
+import com.example.palto.model.Card
+
+/**
+ * ViewModel of a session which has a list of attendances.
+ */
+class AttendanceListViewModel(
+    private val attendanceRepository: AttendanceRepository
+) : ViewModel() {
+
+    val cardsLiveData: MutableLiveData<List<Card>> = MutableLiveData(emptyList())
+
+    fun insertCard(tag: Tag) {
+        val card = Card(
+            "0",
+            tag.id,
+            "tmp",
+            "tmp"
+        )
+        cardsLiveData.value = (cardsLiveData.value ?: emptyList()) + card
+        Log.d("NFC", "view model: A card has been had to the list")
+    }
+
+    /**
+     * ViewModel Factory.
+     */
+    companion object {
+
+        val Factory: ViewModelProvider.Factory = object : ViewModelProvider.Factory {
+            @Suppress("UNCHECKED_CAST")
+            override fun <T : ViewModel> create(
+                modelClass: Class<T>
+            ): T {
+                return AttendanceListViewModel(
+                    AttendanceRepository(ServerDataSource())
+                ) as T
+            }
+        }
+    }
+}

app/src/main/java/com/example/palto/ui/login/LoggedInUserView.kt

@@ -0,0 +1,13 @@
+package com.example.palto.ui.login
+
+/* Est-ce que c’est util ?
+ * Updater la vue dans le fragment
+ */
+
+/**
+ * User details post authentication that is exposed to the UI
+ */
+data class LoggedInUserView(
+    val displayName: String
+    //... other data fields that may be accessible to the UI
+)

app/src/main/java/com/example/palto/ui/login/LoginFormState.kt

@@ -0,0 +1,11 @@
+package com.example.palto.ui.login
+
+/**
+ * Data validation state of the login form.
+ */
+data class LoginFormState(
+    val hostnameError: Int? = null,
+    val usernameError: Int? = null,
+    val passwordError: Int? = null,
+    val isDataValid: Boolean = false
+)

app/src/main/java/com/example/palto/ui/login/LoginFragment.kt

@@ -0,0 +1,136 @@
+package com.example.palto.ui.login
+
+import androidx.lifecycle.Observer
+import androidx.annotation.StringRes
+import androidx.fragment.app.Fragment
+import android.os.Bundle
+import android.text.Editable
+import android.text.TextWatcher
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.view.inputmethod.EditorInfo
+import android.widget.Toast
+import androidx.navigation.fragment.findNavController
+import androidx.navigation.navGraphViewModels
+import com.example.palto.databinding.FragmentLoginBinding
+
+import com.example.palto.R
+
+class LoginFragment : Fragment() {
+
+    private val loginViewModel: LoginViewModel by
+        navGraphViewModels(R.id.nav_graph) { LoginViewModelFactory() }
+
+    private var _binding: FragmentLoginBinding? = null
+
+    // This property is only valid between onCreateView and onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+
+        _binding = FragmentLoginBinding.inflate(inflater, container, false)
+        return binding.root
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+
+        val hostnameEditText = binding.hostname
+        val usernameEditText = binding.username
+        val passwordEditText = binding.password
+        val loginButton = binding.login
+        val loadingProgressBar = binding.loading
+
+        //
+        loginViewModel.loginFormState.observe(viewLifecycleOwner,
+            Observer { loginFormState ->
+                if (loginFormState == null) {
+                    return@Observer
+                }
+                loginButton.isEnabled = loginFormState.isDataValid
+                loginFormState.hostnameError?.let {
+                    hostnameEditText.error = getString(it)
+                }
+                loginFormState.usernameError?.let {
+                    usernameEditText.error = getString(it)
+                }
+                loginFormState.passwordError?.let {
+                    passwordEditText.error = getString(it)
+                }
+            })
+
+        loginViewModel.loginResult.observe(viewLifecycleOwner,
+            Observer { loginResult ->
+                loginResult ?: return@Observer
+                loadingProgressBar.visibility = View.GONE
+                loginResult.error?.let {
+                    showLoginFailed(it)
+                }
+                loginResult.success?.let {
+                    //findNavController().navigate(R.id.action_loginFragment_to_attendanceFragment)
+                    //updateUiWithUser(it)
+                }
+            })
+
+        val afterTextChangedListener = object : TextWatcher {
+            override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) { }
+
+            override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) { }
+
+            override fun afterTextChanged(s: Editable) {
+                loginViewModel.loginDataChanged(
+                    hostnameEditText.text.toString(),
+                    usernameEditText.text.toString(),
+                    passwordEditText.text.toString()
+                )
+            }
+        }
+        hostnameEditText.addTextChangedListener(afterTextChangedListener)
+        usernameEditText.addTextChangedListener(afterTextChangedListener)
+        passwordEditText.addTextChangedListener(afterTextChangedListener)
+        passwordEditText.setOnEditorActionListener { _, actionId, _ ->
+            if (actionId == EditorInfo.IME_ACTION_DONE) {
+                loginViewModel.login(
+                    hostnameEditText.text.toString(),
+                    usernameEditText.text.toString(),
+                    passwordEditText.text.toString()
+                )
+            }
+            false
+        }
+
+        // Damien : Le setOnClickListener est là !
+        loginButton.setOnClickListener {
+            loadingProgressBar.visibility = View.VISIBLE
+            loginViewModel.login(
+                hostnameEditText.text.toString(),
+                usernameEditText.text.toString(),
+                passwordEditText.text.toString()
+            )
+        }
+    }
+
+    /*
+    private fun updateUiWithUser(model: LoggedInUserView) {
+        val welcome = getString(R.string.welcome) + model.displayName
+        // TODO : initiate successful logged in experience
+        val appContext = context?.applicationContext ?: return
+        Toast.makeText(appContext, welcome, Toast.LENGTH_LONG).show()
+    }
+    */
+
+    private fun showLoginFailed(@StringRes errorString: Int) {
+        val appContext = context?.applicationContext ?: return
+        Toast.makeText(appContext, errorString, Toast.LENGTH_LONG).show()
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/example/palto/ui/login/LoginResult.kt

@@ -0,0 +1,9 @@
+package com.example.palto.ui.login
+
+/**
+ * Authentication result : success (user details) or error message.
+ */
+data class LoginResult(
+    val success: LoggedInUserView? = null,
+    val error: Int? = null
+)

app/src/main/java/com/example/palto/ui/login/LoginViewModel.kt

@@ -0,0 +1,84 @@
+package com.example.palto.ui.login
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import android.util.Patterns
+import androidx.lifecycle.ViewModelProvider
+import com.example.palto.data.repository.LoginRepository
+
+import com.example.palto.R
+import com.example.palto.data.network.ServerDataSource
+
+class LoginViewModel(private val loginRepository: LoginRepository) : ViewModel() {
+
+    private val _loginForm = MutableLiveData<LoginFormState>()
+    val loginFormState: LiveData<LoginFormState> = _loginForm
+
+    private val _loginResult = MutableLiveData<LoginResult>()
+    val loginResult: LiveData<LoginResult> = _loginResult
+
+    fun login(
+        hostname: String,
+        username: String,
+        password: String) {
+        // can be launched in a separate asynchronous job
+        val result = loginRepository.login(hostname, username, password)
+
+        /*
+        if (result is Result.Success) {
+            _loginResult.value =
+                LoginResult(success = LoggedInUserView(
+                    displayName = result.data.displayName))
+        } else {
+            _loginResult.value = LoginResult(error = R.string.login_failed)
+        }
+         */
+    }
+
+    fun loginDataChanged(
+        hostname: String,
+        username: String,
+        password: String) {
+        if (!isHostNameValid(hostname)) {
+            _loginForm.value = LoginFormState(hostnameError = R.string.invalid_hostname)
+        } else if (!isUserNameValid(username)) {
+            _loginForm.value = LoginFormState(usernameError = R.string.invalid_username)
+        } else if (!isPasswordValid(password)) {
+            _loginForm.value = LoginFormState(passwordError = R.string.invalid_password)
+        } else {
+            _loginForm.value = LoginFormState(isDataValid = true)
+        }
+    }
+
+    private fun isHostNameValid(hostname: String): Boolean {
+        return hostname.isNotBlank()
+    }
+
+    // A placeholder username validation check
+    private fun isUserNameValid(username: String): Boolean {
+        return if (username.contains("@")) {
+            Patterns.EMAIL_ADDRESS.matcher(username).matches()
+        } else {
+            username.isNotBlank()
+        }
+    }
+
+    // A placeholder password validation check
+    private fun isPasswordValid(password: String): Boolean {
+        return password.length > 5
+    }
+}
+
+class LoginViewModelFactory : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        if (modelClass.isAssignableFrom(LoginViewModel::class.java)) {
+            return LoginViewModel(
+                loginRepository = LoginRepository(
+                    dataSource = ServerDataSource()
+                )
+            ) as T
+        }
+        throw IllegalArgumentException("Unknown ViewModel class")
+    }
+}

app/src/main/java/com/example/palto/ui/sessionList/SessionListAdapter.kt

@@ -0,0 +1,44 @@
+package com.example.palto.ui.sessionList
+
+import androidx.recyclerview.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import android.widget.TextView
+
+import com.example.palto.ui.sessionList.placeholder.PlaceholderContent.PlaceholderItem
+import com.example.palto.databinding.FragmentSessionItemBinding
+
+/**
+ * [RecyclerView.Adapter] that can display a [PlaceholderItem].
+ */
+class SessionListAdapter(private val values: List<PlaceholderItem>) :
+    RecyclerView.Adapter<SessionListAdapter.ViewHolder>() {
+
+    class ViewHolder(binding: FragmentSessionItemBinding) :
+        RecyclerView.ViewHolder(binding.root) {
+
+        val idView: TextView = binding.itemNumber
+        val contentView: TextView = binding.content
+
+        override fun toString(): String {
+            return super.toString() + " '" + contentView.text + "'"
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val view = FragmentSessionItemBinding.inflate(
+            LayoutInflater.from(parent.context),
+            parent,
+            false
+        )
+        return ViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        val item = values[position]
+        holder.idView.text = item.id
+        holder.contentView.text = item.content
+    }
+
+    override fun getItemCount(): Int = values.size
+}

app/src/main/java/com/example/palto/ui/sessionList/SessionListFragment.kt

@@ -0,0 +1,31 @@
+package com.example.palto.ui.sessionList
+
+import android.os.Bundle
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import com.example.palto.R
+import com.example.palto.ui.sessionList.placeholder.PlaceholderContent
+
+/**
+ * A fragment representing a list of Sessions.
+ */
+class SessionListFragment : Fragment() {
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+         container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        val view = inflater.inflate(R.layout.fragment_session_list, container, false)
+
+        if (view is RecyclerView) {
+            view.layoutManager = LinearLayoutManager(context)
+            view.adapter = SessionListAdapter(PlaceholderContent.ITEMS)
+        }
+        return view
+    }
+}

app/src/main/java/com/example/palto/ui/sessionList/SessionListViewModel.kt

@@ -0,0 +1,14 @@
+package com.example.palto.ui.sessionList
+
+import androidx.lifecycle.ViewModel
+import com.example.palto.data.repository.LoginRepository
+
+class SessionListViewModel(private val loginRepository: LoginRepository) : ViewModel() {
+    /*
+    private val _loginForm = MutableLiveData<LoginFormState>()
+    val loginFormState: LiveData<LoginFormState> = _loginForm
+
+    private val _loginResult = MutableLiveData<LoginResult>()
+    val loginResult: LiveData<LoginResult> = _loginResult
+    */
+}

app/src/main/java/com/example/palto/ui/sessionList/placeholder/PlaceholderContent.kt

@@ -0,0 +1,57 @@
+package com.example.palto.ui.sessionList.placeholder
+
+import java.util.ArrayList
+import java.util.HashMap
+
+/**
+ * Helper class for providing sample content for user interfaces created by
+ * Android template wizards.
+ *
+ * TODO: Replace all uses of this class before publishing your app.
+ */
+object PlaceholderContent {
+
+    /**
+     * An array of sample (placeholder) items.
+     */
+    val ITEMS: MutableList<PlaceholderItem> = ArrayList()
+
+    /**
+     * A map of sample (placeholder) items, by ID.
+     */
+    val ITEM_MAP: MutableMap<String, PlaceholderItem> = HashMap()
+
+    private val COUNT = 25
+
+    init {
+        // Add some sample items.
+        for (i in 1..COUNT) {
+            addItem(createPlaceholderItem(i))
+        }
+    }
+
+    private fun addItem(item: PlaceholderItem) {
+        ITEMS.add(item)
+        ITEM_MAP.put(item.id, item)
+    }
+
+    private fun createPlaceholderItem(position: Int): PlaceholderItem {
+        return PlaceholderItem(position.toString(), "Item " + position, makeDetails(position))
+    }
+
+    private fun makeDetails(position: Int): String {
+        val builder = StringBuilder()
+        builder.append("Details about Item: ").append(position)
+        for (i in 0..position - 1) {
+            builder.append("\nMore details information here.")
+        }
+        return builder.toString()
+    }
+
+    /**
+     * A placeholder item representing a piece of content.
+     */
+    data class PlaceholderItem(val id: String, val content: String, val details: String) {
+        override fun toString(): String = content
+    }
+}

app/src/main/res/layout/activity_palto.xml

@@ -3,17 +3,17 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
+    android:layout_height="match_parent">
-    tools:context=".MainActivity">
 
-    <TextView
+    <androidx.fragment.app.FragmentContainerView
-        android:id="@+id/test_text"
+        android:id="@+id/fragmentContainerView"
-        android:layout_width="wrap_content"
+        android:name="androidx.navigation.fragment.NavHostFragment"
-        android:layout_height="wrap_content"
+        android:layout_width="0dp"
-        android:text="Hello World!"
+        android:layout_height="0dp"
+        app:defaultNavHost="true"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+        app:layout_constraintTop_toTopOf="parent"
-
+        app:navGraph="@navigation/nav_graph" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_attendance_item.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal">
+
+    <TextView
+        android:id="@+id/card_̤id"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/text_margin"
+        android:textAppearance="?attr/textAppearanceListItem" />
+</LinearLayout>

app/src/main/res/layout/fragment_attendance_list.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/list"
+    android:name="com.example.palto.ui.attendanceList.AttendanceFragment"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_marginLeft="16dp"
+    android:layout_marginRight="16dp"
+    app:layoutManager="LinearLayoutManager"
+    tools:context=".ui.attendanceList.AttendanceListFragment"
+    tools:listitem="@layout/fragment_attendance_item" />

app/src/main/res/layout/fragment_login.xml

@@ -0,0 +1,109 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/container"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:paddingLeft="@dimen/fragment_horizontal_margin"
+    android:paddingTop="@dimen/fragment_vertical_margin"
+    android:paddingRight="@dimen/fragment_horizontal_margin"
+    android:paddingBottom="@dimen/fragment_vertical_margin"
+    tools:context=".ui.login.LoginFragment">
+
+    <EditText
+        android:id="@+id/hostname"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="64dp"
+        android:layout_marginEnd="24dp"
+        android:autofillHints="@string/prompt_hostname"
+        android:hint="@string/prompt_hostname"
+        android:inputType="text"
+        android:selectAllOnFocus="true"
+        app:layout_constraintBottom_toTopOf="@+id/username"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <EditText
+        android:id="@+id/username"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginEnd="24dp"
+        android:autofillHints="@string/prompt_username"
+        android:hint="@string/prompt_username"
+        android:inputType="text"
+        android:selectAllOnFocus="true"
+        app:layout_constraintBottom_toTopOf="@+id/password"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/hostname" />
+
+    <EditText
+        android:id="@+id/password"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginEnd="24dp"
+        android:autofillHints="@string/prompt_password"
+        android:hint="@string/prompt_password"
+        android:imeActionLabel="@string/action_sign_in_short"
+        android:imeOptions="actionDone"
+        android:inputType="textPassword"
+        android:selectAllOnFocus="true"
+        app:layout_constraintBottom_toTopOf="@+id/help_message"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/username" />
+
+    <TextView
+        android:id="@+id/help_message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/help_message"
+        app:layout_constraintBottom_toTopOf="@+id/login"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/password" />
+
+    <Button
+        android:id="@+id/login"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="start"
+        android:layout_marginStart="48dp"
+        android:layout_marginTop="8dp"
+        android:layout_marginEnd="48dp"
+        android:layout_marginBottom="64dp"
+        android:enabled="false"
+        android:text="@string/action_sign_in"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/help_message"
+        app:layout_constraintVertical_bias="0.2" />
+
+    <ProgressBar
+        android:id="@+id/loading"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        android:layout_marginStart="32dp"
+        android:layout_marginTop="64dp"
+        android:layout_marginEnd="32dp"
+        android:layout_marginBottom="64dp"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="@+id/password"
+        app:layout_constraintStart_toStartOf="@+id/password"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintVertical_bias="0.3" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_session_item.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:orientation="horizontal">
+
+    <TextView
+        android:id="@+id/item_number"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/text_margin"
+        android:textAppearance="?attr/textAppearanceListItem" />
+
+    <TextView
+        android:id="@+id/content"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/text_margin"
+        android:textAppearance="?attr/textAppearanceListItem" />
+</LinearLayout>

app/src/main/res/layout/fragment_session_list.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/list"
+    android:name="com.example.palto.ui.session.SessionListFragment"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_marginLeft="16dp"
+    android:layout_marginRight="16dp"
+    app:layoutManager="LinearLayoutManager"
+    tools:context=".ui.sessionList.SessionListFragment"
+    tools:listitem="@layout/fragment_session_item" />

app/src/main/res/navigation/nav_graph.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/nav_graph"
+    app:startDestination="@id/attendanceListFragment">
+    <fragment
+        android:id="@+id/loginFragment"
+        android:name="com.example.palto.ui.login.LoginFragment"
+        android:label="fragment._login"
+        tools:layout="@layout/fragment_login" />
+    <fragment
+        android:id="@+id/sessionListFragment"
+        android:name="com.example.palto.ui.sessionList.SessionListFragment"
+        android:label="fragment_session_list"
+        tools:layout="@layout/fragment_session_list" />
+    <fragment
+        android:id="@+id/attendanceListFragment"
+        android:name="com.example.palto.ui.attendanceList.AttendanceListFragment"
+        android:label="fragment_attendance_list"
+        tools:layout="@layout/fragment_attendance_list" />
+</navigation>

app/src/main/res/values/dimens.xml

@@ -0,0 +1,6 @@
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="fragment_horizontal_margin">16dp</dimen>
+    <dimen name="fragment_vertical_margin">16dp</dimen>
+    <dimen name="text_margin">16dp</dimen>
+</resources>

app/src/main/res/values/strings.xml

@@ -1,3 +1,15 @@
 <resources>
     <string name="app_name">Palto</string>
+    <!-- Strings related to login -->
+    <string name="prompt_hostname">Serveur</string>
+    <string name="prompt_username">Nom d’utilisateur</string>
+    <string name="prompt_password">Mot de passe</string>
+    <string name="action_sign_in">Connexion</string>
+    <string name="action_sign_in_short">Sign in</string>
+    <string name="welcome">"Bienvenue !"</string>
+    <string name="invalid_hostname">Serveur inaccessible</string>
+    <string name="invalid_username">Nom d’utilisateur non valide</string>
+    <string name="invalid_password">Mot de passe invalide</string>
+    <string name="login_failed">"Erreur de connexion !"</string>
+    <string name="help_message">Identifiants Invalides</string>
 </resources>

build.gradle.kts

@@ -1,5 +1,5 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 plugins {
-    id("com.android.application") version "8.1.2" apply false
+    id("com.android.application") version "8.2.0" apply false
     id("org.jetbrains.kotlin.android") version "1.9.0" apply false
 }