android-learn/Snapshots/app/src/main/java/com/example/snapshots/AddFragment.kt

package com.example.snapshots

import android.annotation.SuppressLint
import android.app.Activity
import android.content.Intent
import android.net.Uri
import android.os.Bundle
import android.provider.MediaStore
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.activity.result.contract.ActivityResultContracts
import com.example.snapshots.databinding.FragmentAddBinding
import com.google.android.material.snackbar.Snackbar
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.database.DatabaseReference
import com.google.firebase.database.FirebaseDatabase
import com.google.firebase.storage.FirebaseStorage
import com.google.firebase.storage.StorageReference

class AddFragment : Fragment() {
    private lateinit var mBinding: FragmentAddBinding
    private val PATHSNAPSHOT = "snapshots"
    private lateinit var mStorageReference: StorageReference
    private lateinit var mDatabaseReferenceRef: DatabaseReference
    private var mPhotoSelectedUri: Uri? = null

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        mBinding = FragmentAddBinding.inflate(inflater, container, false)
        return mBinding.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        mBinding.btnPost.setOnClickListener { postSnapshot() }
        mBinding.btnSelect.setOnClickListener { openGallery() }

        mStorageReference = FirebaseStorage.getInstance().reference
        mDatabaseReferenceRef = FirebaseDatabase.getInstance().reference.child(PATHSNAPSHOT)  // Obtiene el nodo "snapshot"
    }

    private val galleryResult = registerForActivityResult(ActivityResultContracts.StartActivityForResult()) {
        if (it.resultCode == Activity.RESULT_OK) {
            mPhotoSelectedUri = it.data?.data
            with(mBinding) {
                btnSelect.visibility = View.INVISIBLE
                imgPhoto.setImageURI(mPhotoSelectedUri)
                tilTitle.visibility = View.VISIBLE
                tvMessage.text = getString(R.string.post_message_valid_title)
            }
        }
    }

    private fun openGallery() {
        val intent = Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI)
        galleryResult.launch(intent)
    }

    @SuppressLint("SetTextI18n")
    private fun postSnapshot() {
        mBinding.progressBar.visibility = View.VISIBLE
        val key = mDatabaseReferenceRef.push().key!!
        val pathString = FirebaseAuth.getInstance().currentUser!!.uid
        val storageRef = mStorageReference.child(PATHSNAPSHOT).child(pathString).child(key)
        if (mPhotoSelectedUri !== null) {
            storageRef.putFile(mPhotoSelectedUri!!)
                .addOnProgressListener {
                    val progress = (100 * it.bytesTransferred / it.totalByteCount).toDouble()
                    mBinding.progressBar.progress = progress.toInt()
                    mBinding.tvMessage.text = "$progress%"
                }
                .addOnCompleteListener {
                    mBinding.progressBar.visibility = View.INVISIBLE
                }
                .addOnSuccessListener {
                    Snackbar.make(mBinding.root, "Instantanea publicada", Snackbar.LENGTH_SHORT).show()
                    it.storage.downloadUrl.addOnSuccessListener { url ->
                        saveSnapshot(key, url.toString(), mBinding.etTitle.text.toString())
                        with(mBinding) {
                            tilTitle.visibility = View.GONE
                            tvMessage.text = getString(R.string.select_image_text)
                            imgPhoto.setImageURI(null)
                            btnSelect.visibility = View.VISIBLE
                        }
                    }
                }
                .addOnFailureListener {
                    Snackbar.make(mBinding.root, "Error: ${it.message}", Snackbar.LENGTH_SHORT).show()
                }
        }
    }

    private fun saveSnapshot (key: String, url: String, title: String) {
        val snapshot = Snapshot(title = title, photoUrl = url)
        mDatabaseReferenceRef.child(key).setValue(snapshot)
    }
}