App con inicio y base de datos pero sin direccion

app/src/main/java/com/example/basurapp/LoginActivity.kt

@@ -0,0 +1,88 @@
+package com.example.basurapp
+
+import android.content.Intent
+import android.os.Bundle
+import android.util.Patterns
+import android.view.View
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import com.example.basurapp.databinding.ActivityLoginBinding
+import com.google.firebase.auth.FirebaseAuth
+import com.google.firebase.firestore.FirebaseFirestore
+
+class LoginActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivityLoginBinding
+    private val auth: FirebaseAuth by lazy { FirebaseAuth.getInstance() }
+    private val db: FirebaseFirestore by lazy { FirebaseFirestore.getInstance() }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = ActivityLoginBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        // Padding para system bars
+        ViewCompat.setOnApplyWindowInsetsListener(binding.main) { v, insets ->
+            val bars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
+            v.setPadding(bars.left, bars.top, bars.right, bars.bottom)
+            insets
+        }
+
+        // Si ya hay sesión activa, ir directo al Main
+        if (auth.currentUser != null) {
+            goToMain()
+            return
+        }
+
+        binding.tvCreateAccount.setOnClickListener {
+            startActivity(Intent(this, RegisterActivity::class.java))
+        }
+
+        binding.btnEnter.setOnClickListener {
+            attemptLogin()
+        }
+    }
+
+    private fun attemptLogin() {
+        val email = binding.etEmail.text?.toString()?.trim().orEmpty()
+        val password = binding.etPassword.text?.toString().orEmpty()
+
+        // Validaciones
+        if (email.isEmpty() || password.isEmpty()) {
+            toast(getString(R.string.error_empty_fields))
+            return
+        }
+        if (!Patterns.EMAIL_ADDRESS.matcher(email).matches()) {
+            binding.tilEmail.error = getString(R.string.error_invalid_email)
+            return
+        }
+        binding.tilEmail.error = null
+
+        setLoading(true)
+        auth.signInWithEmailAndPassword(email, password)
+            .addOnCompleteListener { task ->
+                if (task.isSuccessful) {
+                    goToMain()
+                } else {
+                    setLoading(false)
+                    toast(task.exception?.localizedMessage ?: "Error al iniciar sesión")
+                }
+            }
+    }
+
+    private fun goToMain() {
+        startActivity(Intent(this, MainActivity::class.java))
+        finish()
+    }
+
+    private fun setLoading(loading: Boolean) {
+        binding.progressBar.visibility = if (loading) View.VISIBLE else View.GONE
+        binding.btnEnter.isEnabled = !loading
+    }
+
+    private fun toast(msg: String) {
+        Toast.makeText(this, msg, Toast.LENGTH_SHORT).show()
+    }
+}