package com.enric.galeria

// imports...

class MainActivity : AppCompatActivity() {

    private lateinit var imageView: ImageView
    private lateinit var btnSelectImage: Button

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

        // Inicializar vistas
        imageView = findViewById(R.id.imageView)
        btnSelectImage = findViewById(R.id.button)

        // Configurar botó
        btnSelectImage.setOnClickListener {
            checkAndRequestPermission()
        }
    }

    // Permís necessari per a Android 13+ (API 33+)
    private val requestPermissionLauncher = registerForActivityResult(
        ActivityResultContracts.RequestPermission()
    ) { isGranted: Boolean ->
        if (isGranted) {
            openGallery()
        } else {
            Toast.makeText(
                this, "Permís denegat. No pots seleccionar imatges.",
                Toast.LENGTH_SHORT ).show()
        }
    }

    // Obrir galeria i obtenir resultat
    private val galleryLauncher = registerForActivityResult(
        ActivityResultContracts.StartActivityForResult()
    ) { result ->
        if (result.resultCode == Activity.RESULT_OK) {
            val data: Intent? = result.data
            val selectedImageUri: Uri? = data?.data

            if (selectedImageUri != null) {
                // Mostrar imatge seleccionada
                imageView.setImageURI(selectedImageUri)
            } else {
                Toast.makeText(
                    this, "No s'ha pogut carregar la imatge.",
                    Toast.LENGTH_SHORT).show()
            }
        }
    }

    private fun checkAndRequestPermission() {
        // Aquesta línia ens obliga a indicar permisos al AndroidManifest.xml
        val permission = android.Manifest.permission.READ_MEDIA_IMAGES

        if (ContextCompat.checkSelfPermission(
            this,permission) == PackageManager.PERMISSION_GRANTED)
        {
            // Permís ja concedit
            openGallery()
        } else {
            // Sol·licitar permís
            requestPermissionLauncher.launch(permission)
        }
    }

    private fun openGallery() {
        val intent = Intent(Intent.ACTION_GET_CONTENT).apply {
            type = "image/*"
            addCategory(Intent.CATEGORY_OPENABLE)
        }

        galleryLauncher.launch(intent)
    }

}