Add functions

LoginView implements MessageView and ShakeView interface now.

app/src/main/java/chat/rocket/android/authentication/login/presentation/LoginView.kt

 package chat.rocket.android.authentication.login.presentation
 
 import chat.rocket.android.core.behaviours.LoadingView
+import chat.rocket.android.core.behaviours.MessageView
+import chat.rocket.android.core.behaviours.ShakeView
 
-interface LoginView : LoadingView {
-    fun onLoginError(message: String?)
+interface LoginView : LoadingView, MessageView, ShakeView {
+
+    /**
+     * Shows the oauth view if the server settings allow the login via social accounts.
+     *
+     * REMARK: we must show at maximum *three* social accounts views ([enableLoginByFacebook], [enableLoginByGithub], [enableLoginByGoogle],
+     * [enableLoginByLinkedin], [enableLoginByMeteor], [enableLoginByTwitter] or [enableLoginByGitlab]) for the oauth view.
+     * If the possibility of login via social accounts exceeds 3 different ways we should set up the FAB ([setupFabListener]) to show the remaining view(s).
+     *
+     * @param show True to show the oauth view, false otherwise.
+     */
+    fun shouldShowOauthView(show: Boolean)
+
+    /**
+     * Setups the FloatingActionButton to show more social accounts views (expanding the oauth view interface to show the remaining view(s)).
+     */
+    fun setupFabListener()
+
+    /**
+     * Shows the login by Facebook view.
+     */
+    fun enableLoginByFacebook()
+
+    /**
+     * Shows the login by Github view.
+     */
+    fun enableLoginByGithub()
+
+    /**
+     * Shows the login by Google view.
+     */
+    fun enableLoginByGoogle()
+
+    /**
+     * Shows the login by Linkedin view.
+     */
+    fun enableLoginByLinkedin()
+
+    /**
+     * Shows the login by Meteor view.
+     */
+    fun enableLoginByMeteor()
+
+    /**
+     * Shows the login by Twitter view.
+     */
+    fun enableLoginByTwitter()
+
+    /**
+     * Shows the login by Gitlab view.
+     */
+    fun enableLoginByGitlab()
+
+    /**
+     * Shows the sign up view if the server settings allow the new users registration.
+     *
+     * @param show True to show the sign up view, false otherwise.
+     */
+    fun shouldShowSignUpView(show: Boolean)
 }
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