P2022-1321 Register screen functionality (validation)

app/src/main/java/com/intive/patronage22/intivi/Fragments/SignUpFragment.kt

@@ -6,22 +6,69 @@ import androidx.fragment.app.Fragment
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.EditText
 import com.intive.patronage22.intivi.MainActivity
+import com.intive.patronage22.intivi.R
 import com.intive.patronage22.intivi.databinding.FragmentSignUpBinding
+import java.util.regex.Pattern
 
 class SignUpFragment : Fragment() {
 
     override fun onCreateView(
         inflater: LayoutInflater, container: ViewGroup?,
         savedInstanceState: Bundle?
-    ): View
-    {
+    ): View {
         val bind = FragmentSignUpBinding.inflate(layoutInflater)
 
-        bind.SignUpButton.setOnClickListener{
-            val intent = Intent(this.requireContext(), MainActivity::class.java)
-            startActivity(intent)
+        bind.SignUpButton.setOnClickListener {
+            if (isEmailOK() and isPasswordOK() and isRepeatPasswordOK()) {
+                val intent = Intent(this.requireContext(), MainActivity::class.java)
+                startActivity(intent)
+            }
         }
         return bind.root
     }
+
+    private fun isEmailOK(): Boolean {
+        val editText = requireView().findViewById<EditText>(R.id.loginEditText)
+        if (!isEmailValid(editText.text.toString())) {
+            editText.error = "This is not an e-mail address"
+            return false
+        } else {
+            return true
+        }
+    }
+
+    private fun isEmailValid(email: String): Boolean {
+        return Pattern.compile(
+            "[a-zA-Z0-9+._%-]{1,256}" +
+                    "@" +
+                    "[a-zA-Z0-9][a-zA-Z0-9-]{0,64}" +
+                    "(" +
+                    "\\." +
+                    "[a-zA-Z0-9][a-zA-Z0-9-]{0,25}" +
+                    ")+"
+        ).matcher(email).matches()
+    }
+
+    private fun isPasswordOK(): Boolean {
+        val editText = requireView().findViewById<EditText>(R.id.passwordEditText)
+        if (editText.text.length < 5) {
+            editText.error = "Password must be at least 5 characters long"
+            return false
+        } else {
+            return true
+        }
+    }
+
+    private fun isRepeatPasswordOK(): Boolean {
+        val password = requireView().findViewById<EditText>(R.id.passwordEditText)
+        val repeatPassword = requireView().findViewById<EditText>(R.id.repeatPassword)
+        if (password.text.toString() != repeatPassword.text.toString()) {
+            repeatPassword.error = "Passwords do not match"
+            return false
+        } else {
+            return true
+        }
+    }
 }