Add API key settings with save/delete options

app/src/main/java/com/mistral/chat/ui/MainActivity.kt

@@ -50,13 +50,14 @@ class MainActivity : AppCompatActivity() {
     private lateinit var prefs: SharedPreferences
 
     companion object {
-        private const val API_KEY = "YW0IjDBRLuyEBcgNjVeVUFlMI6fcZYLA"
         private const val PREFS_NAME = "mistral_chat_prefs"
         private const val KEY_USER_NAME = "user_name"
         private const val KEY_USER_BIO = "user_bio"
         private const val KEY_USER_PREFS = "user_preferences"
         private const val KEY_MESSAGES = "chat_messages"
         private const val KEY_PROFILE_HASH = "profile_hash"
+        private const val KEY_API_KEY = "api_key"
+        private const val DEFAULT_API_KEY = "YW0IjDBRLuyEBcgNjVeVUFlMI6fcZYLA"
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -69,7 +70,7 @@ class MainActivity : AppCompatActivity() {
 
         gson = Gson()
         prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE)
-        client = MistralClient(API_KEY)
+        client = MistralClient(getApiKey())
 
         loadMessages()
         
@@ -103,6 +104,10 @@ class MainActivity : AppCompatActivity() {
             popup.menuInflater.inflate(R.menu.main_menu, popup.menu)
             popup.setOnMenuItemClickListener { menuItem ->
                 when (menuItem.itemId) {
+                    R.id.action_api_key -> {
+                        showApiKeyDialog()
+                        true
+                    }
                     R.id.action_profile -> {
                         showProfileDialog()
                         true
@@ -225,6 +230,65 @@ class MainActivity : AppCompatActivity() {
         prefs.edit().putString(KEY_MESSAGES, json).apply()
     }
 
+    private fun getApiKey(): String {
+        return prefs.getString(KEY_API_KEY, DEFAULT_API_KEY) ?: DEFAULT_API_KEY
+    }
+
+    private fun saveApiKey(apiKey: String) {
+        prefs.edit().putString(KEY_API_KEY, apiKey).apply()
+        client = MistralClient(apiKey)
+    }
+
+    private fun deleteApiKey() {
+        prefs.edit().remove(KEY_API_KEY).apply()
+        client = MistralClient(DEFAULT_API_KEY)
+    }
+
+    private fun showApiKeyDialog() {
+        val currentKey = getApiKey()
+        val hasCustomKey = currentKey != DEFAULT_API_KEY && prefs.contains(KEY_API_KEY)
+        val displayKey = if (hasCustomKey && currentKey.length > 8) {
+            currentKey.take(4) + "*".repeat(currentKey.length - 8) + currentKey.takeLast(4)
+        } else if (hasCustomKey) {
+            "******"
+        } else {
+            getString(R.string.no_api_key)
+        }
+
+        val dialogView = layoutInflater.inflate(R.layout.dialog_api_key, null)
+        val inputField = dialogView.findViewById<TextInputEditText>(R.id.apiKeyInput)
+        
+        if (hasCustomKey) {
+            inputField.setText(currentKey)
+        }
+
+        AlertDialog.Builder(this)
+            .setTitle(R.string.api_key_title)
+            .setMessage(getString(R.string.api_key_current, displayKey))
+            .setView(dialogView)
+            .setPositiveButton(R.string.save) { _, _ ->
+                val newKey = inputField.text?.toString()?.trim()
+                if (!newKey.isNullOrEmpty()) {
+                    saveApiKey(newKey)
+                    showToast(getString(R.string.api_key_saved))
+                }
+            }
+            .setNegativeButton(R.string.cancel, null)
+            .apply {
+                if (hasCustomKey) {
+                    setNeutralButton(R.string.delete) { _, _ ->
+                        deleteApiKey()
+                        showToast(getString(R.string.api_key_deleted))
+                    }
+                }
+            }
+            .show()
+    }
+
+    private fun showToast(message: String) {
+        android.widget.Toast.makeText(this, message, android.widget.Toast.LENGTH_SHORT).show()
+    }
+
     private fun sendMessage(userInput: String) {
         val selectedModel = selectedModelName
         

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

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="24dp">
+
+    <com.google.android.material.textfield.TextInputLayout
+        android:id="@+id/apiKeyLayout"
+        style="@style/Widget.Material3.TextInputLayout.OutlinedBox"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:hint="@string/api_key_hint"
+        app:endIconMode="password_toggle">
+
+        <com.google.android.material.textfield.TextInputEditText
+            android:id="@+id/apiKeyInput"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:inputType="textPassword"
+            android:maxLines="1" />
+
+    </com.google.android.material.textfield.TextInputLayout>
+
+</LinearLayout>

app/src/main/res/menu/main_menu.xml

@@ -2,6 +2,10 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
+    <item
+        android:id="@+id/action_api_key"
+        android:title="@string/api_key" />
+
     <item
         android:id="@+id/action_profile"
         android:title="@string/profile" />

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

@@ -25,4 +25,11 @@
     <string name="bio_hint">Расскажите о себе...</string>
     <string name="no_profile">Профиль не установлен</string>
     <string name="settings">Настройки</string>
+    <string name="api_key">Mistral API</string>
+    <string name="api_key_title">Mistral API ключ</string>
+    <string name="api_key_hint">Введите API ключ</string>
+    <string name="api_key_saved">API ключ сохранён</string>
+    <string name="api_key_deleted">API ключ удалён</string>
+    <string name="no_api_key">API ключ не установлен</string>
+    <string name="api_key_current">Текущий ключ: %s</string>
 </resources>