PixelDroid-App-Android/app/src/main/java/com/h/pixeldroid/MainActivity.kt

package com.h.pixeldroid

import android.content.Intent
import android.os.Bundle
import android.view.MenuItem
import android.view.View
import android.widget.Button
import androidx.annotation.NonNull
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.GravityCompat
import androidx.drawerlayout.widget.DrawerLayout
import com.google.android.material.navigation.NavigationView

class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener {

    private lateinit var drawerLayout: DrawerLayout

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        // Setup the drawer
        drawerLayout = findViewById(R.id.drawer_layout)
        val navigationView: NavigationView = findViewById(R.id.nav_view)
        navigationView.setNavigationItemSelectedListener(this)

        val buttonLogin = findViewById<Button>(R.id.button_start_login)
        buttonLogin.setOnClickListener((View.OnClickListener {
            val intent = Intent(this, LoginActivity::class.java)
            startActivity(intent) }))

        val button = findViewById<Button>(R.id.button)
        button.setOnClickListener((View.OnClickListener {
            val intent = Intent(this, ProfileActivity::class.java)
            startActivity(intent) }))
    }

    /*
    When clicking in the drawer menu, go to the corresponding activity
     */
    override fun onNavigationItemSelected(@NonNull item: MenuItem): Boolean {
        when (item.itemId){
            R.id.nav_settings -> launchActivity(SettingsActivity())
            R.id.nav_account -> launchActivity(ProfileActivity())
        }

        drawerLayout.closeDrawer(GravityCompat.START)

        return true
    }

    /*
    Launches the given activity and put it as the current one
     */
    private fun launchActivity(activity: AppCompatActivity) {
        val intent = Intent(this, activity::class.java)
        startActivity(intent)
    }

    /*
    Closes the drawer if we are clicking behind it
     */
    override fun onBackPressed() {
        if(drawerLayout.isDrawerOpen(GravityCompat.START)){
            drawerLayout.closeDrawer(GravityCompat.START)
        } else {
            super.onBackPressed()
        }
    }

}