Convert PendingUploadsPresenter and contract to Kotlin with some code-cleanup

app/src/main/java/fr/free/nrw/commons/upload/FailedUploadsFragment.kt

@@ -10,6 +10,7 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import fr.free.nrw.commons.R
 import fr.free.nrw.commons.auth.SessionManager
 import fr.free.nrw.commons.contributions.Contribution
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_FAILED
 import fr.free.nrw.commons.databinding.FragmentFailedUploadsBinding
 import fr.free.nrw.commons.di.CommonsDaggerSupportFragment
 import fr.free.nrw.commons.media.MediaClient
@@ -43,7 +44,7 @@ class FailedUploadsFragment :
 
     private lateinit var adapter: FailedUploadsAdapter
 
-    var contributionsList = ArrayList<Contribution>()
+    var contributionsList = mutableListOf<Contribution>()
 
     private lateinit var uploadProgressActivity: UploadProgressActivity
 
@@ -71,7 +72,7 @@ class FailedUploadsFragment :
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?,
-    ): View? {
+    ): View {
         binding = FragmentFailedUploadsBinding.inflate(layoutInflater)
         pendingUploadsPresenter.onAttachView(this)
         initAdapter()
@@ -99,9 +100,9 @@ class FailedUploadsFragment :
         pendingUploadsPresenter.getFailedContributions()
         pendingUploadsPresenter.failedContributionList.observe(
             viewLifecycleOwner,
-        ) { list: PagedList<Contribution?> ->
+        ) { list: PagedList<Contribution> ->
             adapter.submitList(list)
-            contributionsList = ArrayList()
+            contributionsList = mutableListOf()
             list.forEach {
                 if (it != null) {
                     contributionsList.add(it)
@@ -124,26 +125,22 @@ class FailedUploadsFragment :
      * Restarts all the failed uploads.
      */
     fun restartUploads() {
-        if (contributionsList != null) {
-            pendingUploadsPresenter.restartUploads(
-                contributionsList,
-                0,
-                this.requireContext().applicationContext,
-            )
-        }
+        pendingUploadsPresenter.restartUploads(
+            contributionsList,
+            0,
+            requireContext().applicationContext,
+        )
     }
 
     /**
      * Restarts a specific upload.
      */
     override fun restartUpload(index: Int) {
-        if (contributionsList != null) {
-            pendingUploadsPresenter.restartUpload(
-                contributionsList,
-                index,
-                this.requireContext().applicationContext,
-            )
-        }
+        pendingUploadsPresenter.restartUpload(
+            contributionsList,
+            index,
+            requireContext().applicationContext,
+        )
     }
 
     /**
@@ -166,7 +163,7 @@ class FailedUploadsFragment :
                 ViewUtil.showShortToast(context, R.string.cancelling_upload)
                 pendingUploadsPresenter.deleteUpload(
                     contribution,
-                    this.requireContext().applicationContext,
+                    requireContext().applicationContext,
                 )
             },
             {},
@@ -177,28 +174,24 @@ class FailedUploadsFragment :
      * Deletes all the uploads after getting a confirmation from the user using Dialog.
      */
     fun deleteUploads() {
-        if (contributionsList != null) {
-            DialogUtil.showAlertDialog(
-                requireActivity(),
-                String.format(
-                    Locale.getDefault(),
-                    requireActivity().getString(R.string.cancelling_all_the_uploads),
-                ),
-                String.format(
-                    Locale.getDefault(),
-                    requireActivity().getString(R.string.are_you_sure_that_you_want_cancel_all_the_uploads),
-                ),
-                String.format(Locale.getDefault(), requireActivity().getString(R.string.yes)),
-                String.format(Locale.getDefault(), requireActivity().getString(R.string.no)),
-                {
-                    ViewUtil.showShortToast(context, R.string.cancelling_upload)
-                    uploadProgressActivity.hidePendingIcons()
-                    pendingUploadsPresenter.deleteUploads(
-                        listOf(Contribution.STATE_FAILED),
-                    )
-                },
-                {},
-            )
-        }
+        DialogUtil.showAlertDialog(
+            requireActivity(),
+            String.format(
+                Locale.getDefault(),
+                requireActivity().getString(R.string.cancelling_all_the_uploads),
+            ),
+            String.format(
+                Locale.getDefault(),
+                requireActivity().getString(R.string.are_you_sure_that_you_want_cancel_all_the_uploads),
+            ),
+            String.format(Locale.getDefault(), requireActivity().getString(R.string.yes)),
+            String.format(Locale.getDefault(), requireActivity().getString(R.string.no)),
+            {
+                ViewUtil.showShortToast(context, R.string.cancelling_upload)
+                uploadProgressActivity.hidePendingIcons()
+                pendingUploadsPresenter.deleteUploads(listOf(STATE_FAILED))
+            },
+            {},
+        )
     }
 }

app/src/main/java/fr/free/nrw/commons/upload/PendingUploadsContract.java

@@ -1,31 +0,0 @@
-package fr.free.nrw.commons.upload;
-
-import android.content.Context;
-import fr.free.nrw.commons.BasePresenter;
-import fr.free.nrw.commons.contributions.Contribution;
-import fr.free.nrw.commons.nearby.contract.NearbyParentFragmentContract;
-import fr.free.nrw.commons.nearby.contract.NearbyParentFragmentContract.View;
-
-/**
- * The contract using which the PendingUploadsFragment or FailedUploadsFragment would communicate
- * with its PendingUploadsPresenter
- */
-public class PendingUploadsContract {
-
-    /**
-     * Interface representing the view for uploads.
-     */
-    public interface View { }
-
-    /**
-     * Interface representing the user actions related to uploads.
-     */
-    public interface UserActionListener extends
-        BasePresenter<fr.free.nrw.commons.upload.PendingUploadsContract.View> {
-
-        /**
-         * Deletes a upload.
-         */
-        void deleteUpload(Contribution contribution, Context context);
-    }
-}

app/src/main/java/fr/free/nrw/commons/upload/PendingUploadsContract.kt

@@ -0,0 +1,26 @@
+package fr.free.nrw.commons.upload
+
+import android.content.Context
+import fr.free.nrw.commons.BasePresenter
+import fr.free.nrw.commons.contributions.Contribution
+
+/**
+ * The contract using which the PendingUploadsFragment or FailedUploadsFragment would communicate
+ * with its PendingUploadsPresenter
+ */
+class PendingUploadsContract {
+    /**
+     * Interface representing the view for uploads.
+     */
+    interface View
+
+    /**
+     * Interface representing the user actions related to uploads.
+     */
+    interface UserActionListener : BasePresenter<View> {
+        /**
+         * Deletes a upload.
+         */
+        fun deleteUpload(contribution: Contribution?, context: Context?)
+    }
+}

app/src/main/java/fr/free/nrw/commons/upload/PendingUploadsFragment.kt

@@ -10,6 +10,9 @@ import androidx.recyclerview.widget.LinearLayoutManager
 import fr.free.nrw.commons.CommonsApplication
 import fr.free.nrw.commons.R
 import fr.free.nrw.commons.contributions.Contribution
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_IN_PROGRESS
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_PAUSED
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_QUEUED
 import fr.free.nrw.commons.databinding.FragmentPendingUploadsBinding
 import fr.free.nrw.commons.di.CommonsDaggerSupportFragment
 import fr.free.nrw.commons.utils.DialogUtil.showAlertDialog
@@ -35,7 +38,8 @@ class PendingUploadsFragment :
     private lateinit var adapter: PendingUploadsAdapter
 
     private var contributionsSize = 0
-    var contributionsList = ArrayList<Contribution>()
+
+    private var contributionsList = mutableListOf<Contribution>()
 
     override fun onAttach(context: Context) {
         super.onAttach(context)
@@ -48,7 +52,7 @@ class PendingUploadsFragment :
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?,
-    ): View? {
+    ): View {
         super.onCreate(savedInstanceState)
         binding = FragmentPendingUploadsBinding.inflate(inflater, container, false)
         pendingUploadsPresenter.onAttachView(this)
@@ -71,27 +75,24 @@ class PendingUploadsFragment :
     /**
      * Initializes the recycler view.
      */
-    fun initRecyclerView() {
+    private fun initRecyclerView() {
         binding.pendingUploadsRecyclerView.setLayoutManager(LinearLayoutManager(this.context))
         binding.pendingUploadsRecyclerView.adapter = adapter
         pendingUploadsPresenter.setup()
-        pendingUploadsPresenter.totalContributionList.observe(
-            viewLifecycleOwner,
-        ) { list: PagedList<Contribution?> ->
+        pendingUploadsPresenter.totalContributionList
+            .observe(viewLifecycleOwner) { list: PagedList<Contribution> ->
             contributionsSize = list.size
-            contributionsList = ArrayList()
+            contributionsList = mutableListOf()
             var pausedOrQueuedUploads = 0
             list.forEach {
                 if (it != null) {
-                    if (it.state == Contribution.STATE_PAUSED ||
-                        it.state == Contribution.STATE_QUEUED ||
-                        it.state == Contribution.STATE_IN_PROGRESS
+                    if (it.state == STATE_PAUSED ||
+                        it.state == STATE_QUEUED ||
+                        it.state == STATE_IN_PROGRESS
                     ) {
                         contributionsList.add(it)
                     }
-                    if (it.state == Contribution.STATE_PAUSED ||
-                        it.state == Contribution.STATE_QUEUED
-                    ) {
+                    if (it.state == STATE_PAUSED || it.state == STATE_QUEUED) {
                         pausedOrQueuedUploads++
                     }
                 }
@@ -104,7 +105,7 @@ class PendingUploadsFragment :
                 binding.nopendingTextView.visibility = View.GONE
                 binding.pendingUplaodsLl.visibility = View.VISIBLE
                 adapter.submitList(list)
-                binding.progressTextView.setText(contributionsSize.toString() + " uploads left")
+                binding.progressTextView.setText("$contributionsSize uploads left")
                 if ((pausedOrQueuedUploads == contributionsSize) || CommonsApplication.isPaused) {
                     uploadProgressActivity.setPausedIcon(true)
                 } else {
@@ -118,23 +119,18 @@ class PendingUploadsFragment :
      * Cancels a specific upload after getting a confirmation from the user using Dialog.
      */
     override fun deleteUpload(contribution: Contribution?) {
+        val activity = requireActivity()
+        val locale = Locale.getDefault()
         showAlertDialog(
-            requireActivity(),
-            String.format(
-                Locale.getDefault(),
-                requireActivity().getString(R.string.cancelling_upload),
-            ),
-            String.format(
-                Locale.getDefault(),
-                requireActivity().getString(R.string.cancel_upload_dialog),
-            ),
-            String.format(Locale.getDefault(), requireActivity().getString(R.string.yes)),
-            String.format(Locale.getDefault(), requireActivity().getString(R.string.no)),
+            activity,
+            String.format(locale, activity.getString(R.string.cancelling_upload)),
+            String.format(locale, activity.getString(R.string.cancel_upload_dialog)),
+            String.format(locale, activity.getString(R.string.yes)),
+            String.format(locale, activity.getString(R.string.no)),
             {
                 ViewUtil.showShortToast(context, R.string.cancelling_upload)
                 pendingUploadsPresenter.deleteUpload(
-                    contribution,
-                    this.requireContext().applicationContext,
+                    contribution, requireContext().applicationContext,
                 )
             },
             {},
@@ -144,47 +140,35 @@ class PendingUploadsFragment :
     /**
      * Restarts all the paused uploads.
      */
-    fun restartUploads() {
-        if (contributionsList != null) {
-            pendingUploadsPresenter.restartUploads(
-                contributionsList,
-                0,
-                this.requireContext().applicationContext,
-            )
-        }
-    }
+    fun restartUploads() = pendingUploadsPresenter.restartUploads(
+        contributionsList, 0, requireContext().applicationContext
+    )
 
     /**
      * Pauses all the ongoing uploads.
      */
-    fun pauseUploads() {
-        pendingUploadsPresenter.pauseUploads()
-    }
+    fun pauseUploads() = pendingUploadsPresenter.pauseUploads()
 
     /**
      * Cancels all the uploads after getting a confirmation from the user using Dialog.
      */
     fun deleteUploads() {
+        val activity = requireActivity()
+        val locale = Locale.getDefault()
         showAlertDialog(
-            requireActivity(),
-            String.format(
-                Locale.getDefault(),
-                requireActivity().getString(R.string.cancelling_all_the_uploads),
-            ),
-            String.format(
-                Locale.getDefault(),
-                requireActivity().getString(R.string.are_you_sure_that_you_want_cancel_all_the_uploads),
-            ),
-            String.format(Locale.getDefault(), requireActivity().getString(R.string.yes)),
-            String.format(Locale.getDefault(), requireActivity().getString(R.string.no)),
+            activity,
+            String.format(locale, activity.getString(R.string.cancelling_all_the_uploads)),
+            String.format(locale, activity.getString(R.string.are_you_sure_that_you_want_cancel_all_the_uploads)),
+            String.format(locale, activity.getString(R.string.yes)),
+            String.format(locale, activity.getString(R.string.no)),
             {
                 ViewUtil.showShortToast(context, R.string.cancelling_upload)
                 uploadProgressActivity.hidePendingIcons()
                 pendingUploadsPresenter.deleteUploads(
                     listOf(
-                        Contribution.STATE_QUEUED,
-                        Contribution.STATE_IN_PROGRESS,
-                        Contribution.STATE_PAUSED,
+                        STATE_QUEUED,
+                        STATE_IN_PROGRESS,
+                        STATE_PAUSED,
                     ),
                 )
             },

app/src/main/java/fr/free/nrw/commons/upload/PendingUploadsPresenter.java

@@ -1,263 +0,0 @@
-package fr.free.nrw.commons.upload;
-
-
-import static fr.free.nrw.commons.di.CommonsApplicationModule.IO_THREAD;
-import static fr.free.nrw.commons.utils.ImageUtils.IMAGE_OK;
-
-import android.content.Context;
-import androidx.annotation.NonNull;
-import androidx.lifecycle.LiveData;
-import androidx.paging.DataSource.Factory;
-import androidx.paging.LivePagedListBuilder;
-import androidx.paging.PagedList;
-import androidx.work.ExistingWorkPolicy;
-import fr.free.nrw.commons.CommonsApplication;
-import fr.free.nrw.commons.contributions.Contribution;
-import fr.free.nrw.commons.contributions.ContributionBoundaryCallback;
-import fr.free.nrw.commons.contributions.ContributionsRemoteDataSource;
-import fr.free.nrw.commons.contributions.ContributionsRepository;
-import fr.free.nrw.commons.di.CommonsApplicationModule;
-import fr.free.nrw.commons.repository.UploadRepository;
-import fr.free.nrw.commons.upload.PendingUploadsContract.UserActionListener;
-import fr.free.nrw.commons.upload.PendingUploadsContract.View;
-import fr.free.nrw.commons.upload.worker.WorkRequestHelper;
-import io.reactivex.Scheduler;
-import io.reactivex.disposables.CompositeDisposable;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Calendar;
-import java.util.Collections;
-import java.util.List;
-import javax.inject.Inject;
-import javax.inject.Named;
-import timber.log.Timber;
-
-/**
- * The presenter class for PendingUploadsFragment and FailedUploadsFragment
- */
-public class PendingUploadsPresenter implements UserActionListener {
-
-    private final ContributionBoundaryCallback contributionBoundaryCallback;
-    private final ContributionsRepository contributionsRepository;
-    private final UploadRepository uploadRepository;
-    private final Scheduler ioThreadScheduler;
-
-    private final CompositeDisposable compositeDisposable;
-    private final ContributionsRemoteDataSource contributionsRemoteDataSource;
-
-    LiveData<PagedList<Contribution>> totalContributionList;
-    LiveData<PagedList<Contribution>> failedContributionList;
-
-    @Inject
-    PendingUploadsPresenter(
-        final ContributionBoundaryCallback contributionBoundaryCallback,
-        final ContributionsRemoteDataSource contributionsRemoteDataSource,
-        final ContributionsRepository contributionsRepository,
-        final UploadRepository uploadRepository,
-        @Named(IO_THREAD) final Scheduler ioThreadScheduler) {
-        this.contributionBoundaryCallback = contributionBoundaryCallback;
-        this.contributionsRepository = contributionsRepository;
-        this.uploadRepository = uploadRepository;
-        this.ioThreadScheduler = ioThreadScheduler;
-        this.contributionsRemoteDataSource = contributionsRemoteDataSource;
-        compositeDisposable = new CompositeDisposable();
-    }
-
-    /**
-     * Setups the paged list of Pending Uploads. This method sets the configuration for paged list
-     * and ties it up with the live data object. This method can be tweaked to update the lazy
-     * loading behavior of the contributions list
-     */
-    void setup() {
-        final PagedList.Config pagedListConfig =
-            (new PagedList.Config.Builder())
-                .setPrefetchDistance(50)
-                .setPageSize(10).build();
-        Factory<Integer, Contribution> factory;
-
-        factory = contributionsRepository.fetchContributionsWithStatesSortedByDateUploadStarted(
-            Arrays.asList(Contribution.STATE_QUEUED, Contribution.STATE_IN_PROGRESS,
-                Contribution.STATE_PAUSED));
-        LivePagedListBuilder livePagedListBuilder = new LivePagedListBuilder(factory,
-            pagedListConfig);
-        totalContributionList = livePagedListBuilder.build();
-    }
-
-    /**
-     * Setups the paged list of Failed Uploads. This method sets the configuration for paged list
-     * and ties it up with the live data object. This method can be tweaked to update the lazy
-     * loading behavior of the contributions list
-     */
-    void getFailedContributions() {
-        final PagedList.Config pagedListConfig =
-            (new PagedList.Config.Builder())
-                .setPrefetchDistance(50)
-                .setPageSize(10).build();
-        Factory<Integer, Contribution> factory;
-        factory = contributionsRepository.fetchContributionsWithStatesSortedByDateUploadStarted(
-            Collections.singletonList(Contribution.STATE_FAILED));
-        LivePagedListBuilder livePagedListBuilder = new LivePagedListBuilder(factory,
-            pagedListConfig);
-        failedContributionList = livePagedListBuilder.build();
-    }
-
-    @Override
-    public void onAttachView(@NonNull View view) {
-
-    }
-
-    @Override
-    public void onDetachView() {
-        compositeDisposable.clear();
-        contributionsRemoteDataSource.dispose();
-        contributionBoundaryCallback.dispose();
-    }
-
-    /**
-     * Deletes the specified upload (contribution) from the database.
-     *
-     * @param contribution The contribution object representing the upload to be deleted.
-     * @param context      The context in which the operation is being performed.
-     */
-    @Override
-    public void deleteUpload(final Contribution contribution, Context context) {
-        compositeDisposable.add(contributionsRepository
-            .deleteContributionFromDB(contribution)
-            .subscribeOn(ioThreadScheduler)
-            .subscribe());
-    }
-
-    /**
-     * Pauses all the uploads by changing the state of contributions from STATE_QUEUED and
-     * STATE_IN_PROGRESS to STATE_PAUSED in the database.
-     */
-    public void pauseUploads() {
-        CommonsApplication.isPaused = true;
-        compositeDisposable.add(contributionsRepository
-            .updateContributionsWithStates(
-                List.of(Contribution.STATE_QUEUED, Contribution.STATE_IN_PROGRESS),
-                Contribution.STATE_PAUSED)
-            .subscribeOn(ioThreadScheduler)
-            .subscribe());
-    }
-
-    /**
-     * Deletes contributions from the database that match the specified states.
-     *
-     * @param states A list of integers representing the states of the contributions to be deleted.
-     */
-    public void deleteUploads(List<Integer> states) {
-        compositeDisposable.add(contributionsRepository
-            .deleteContributionsFromDBWithStates(states)
-            .subscribeOn(ioThreadScheduler)
-            .subscribe());
-    }
-
-    /**
-     * Restarts the uploads for the specified list of contributions starting from the given index.
-     *
-     * @param contributionList The list of contributions to be restarted.
-     * @param index            The starting index in the list from which to restart uploads.
-     * @param context          The context in which the operation is being performed.
-     */
-    public void restartUploads(List<Contribution> contributionList, int index, Context context) {
-        CommonsApplication.isPaused = false;
-        if (index >= contributionList.size()) {
-            return;
-        }
-        Contribution it = contributionList.get(index);
-        if (it.getState() == Contribution.STATE_FAILED) {
-            it.setDateUploadStarted(Calendar.getInstance().getTime());
-            if (it.getErrorInfo() == null) {
-                it.setChunkInfo(null);
-                it.setTransferred(0);
-            }
-            compositeDisposable.add(uploadRepository
-                .checkDuplicateImage(it.getLocalUriPath().getPath())
-                .subscribeOn(ioThreadScheduler)
-                .subscribe(imageCheckResult -> {
-                    if (imageCheckResult == IMAGE_OK) {
-                        it.setState(Contribution.STATE_QUEUED);
-                        compositeDisposable.add(contributionsRepository
-                            .save(it)
-                            .subscribeOn(ioThreadScheduler)
-                            .doOnComplete(() -> {
-                                restartUploads(contributionList, index + 1, context);
-                            })
-                            .subscribe(() -> WorkRequestHelper.Companion.makeOneTimeWorkRequest(
-                                context, ExistingWorkPolicy.KEEP)));
-                    } else {
-                        Timber.e("Contribution already exists");
-                        compositeDisposable.add(contributionsRepository
-                            .deleteContributionFromDB(it)
-                            .subscribeOn(ioThreadScheduler).doOnComplete(() -> {
-                                restartUploads(contributionList, index + 1, context);
-                            })
-                            .subscribe());
-                    }
-                }, throwable -> {
-                    Timber.e(throwable);
-                    restartUploads(contributionList, index + 1, context);
-                }));
-        } else {
-            it.setState(Contribution.STATE_QUEUED);
-            compositeDisposable.add(contributionsRepository
-                .save(it)
-                .subscribeOn(ioThreadScheduler)
-                .doOnComplete(() -> {
-                    restartUploads(contributionList, index + 1, context);
-                })
-                .subscribe(() -> WorkRequestHelper.Companion.makeOneTimeWorkRequest(
-                    context, ExistingWorkPolicy.KEEP)));
-        }
-    }
-
-    /**
-     * Restarts the upload for the specified list of contributions for the given index.
-     *
-     * @param contributionList The list of contributions.
-     * @param index            The index in the list which to be restarted.
-     * @param context          The context in which the operation is being performed.
-     */
-    public void restartUpload(List<Contribution> contributionList, int index, Context context) {
-        CommonsApplication.isPaused = false;
-        if (index >= contributionList.size()) {
-            return;
-        }
-        Contribution it = contributionList.get(index);
-        if (it.getState() == Contribution.STATE_FAILED) {
-            it.setDateUploadStarted(Calendar.getInstance().getTime());
-            if (it.getErrorInfo() == null) {
-                it.setChunkInfo(null);
-                it.setTransferred(0);
-            }
-            compositeDisposable.add(uploadRepository
-                .checkDuplicateImage(it.getLocalUriPath().getPath())
-                .subscribeOn(ioThreadScheduler)
-                .subscribe(imageCheckResult -> {
-                    if (imageCheckResult == IMAGE_OK) {
-                        it.setState(Contribution.STATE_QUEUED);
-                        compositeDisposable.add(contributionsRepository
-                            .save(it)
-                            .subscribeOn(ioThreadScheduler)
-                            .subscribe(() -> WorkRequestHelper.Companion.makeOneTimeWorkRequest(
-                                context, ExistingWorkPolicy.KEEP)));
-                    } else {
-                        Timber.e("Contribution already exists");
-                        compositeDisposable.add(contributionsRepository
-                            .deleteContributionFromDB(it)
-                            .subscribeOn(ioThreadScheduler)
-                            .subscribe());
-                    }
-                }));
-        } else {
-            it.setState(Contribution.STATE_QUEUED);
-            compositeDisposable.add(contributionsRepository
-                .save(it)
-                .subscribeOn(ioThreadScheduler)
-                .subscribe(() -> WorkRequestHelper.Companion.makeOneTimeWorkRequest(
-                    context, ExistingWorkPolicy.KEEP)));
-        }
-    }
-
-}

app/src/main/java/fr/free/nrw/commons/upload/PendingUploadsPresenter.kt

@@ -0,0 +1,256 @@
+package fr.free.nrw.commons.upload
+
+import android.content.Context
+import androidx.lifecycle.LiveData
+import androidx.paging.LivePagedListBuilder
+import androidx.paging.PagedList
+import androidx.work.ExistingWorkPolicy
+import fr.free.nrw.commons.CommonsApplication
+import fr.free.nrw.commons.contributions.Contribution
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_FAILED
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_IN_PROGRESS
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_PAUSED
+import fr.free.nrw.commons.contributions.Contribution.Companion.STATE_QUEUED
+import fr.free.nrw.commons.contributions.ContributionBoundaryCallback
+import fr.free.nrw.commons.contributions.ContributionsRemoteDataSource
+import fr.free.nrw.commons.contributions.ContributionsRepository
+import fr.free.nrw.commons.di.CommonsApplicationModule
+import fr.free.nrw.commons.repository.UploadRepository
+import fr.free.nrw.commons.upload.worker.WorkRequestHelper.Companion.makeOneTimeWorkRequest
+import fr.free.nrw.commons.utils.ImageUtils.IMAGE_OK
+import io.reactivex.Scheduler
+import io.reactivex.disposables.CompositeDisposable
+import timber.log.Timber
+import java.util.Calendar
+import javax.inject.Inject
+import javax.inject.Named
+
+
+/**
+ * The presenter class for PendingUploadsFragment and FailedUploadsFragment
+ */
+class PendingUploadsPresenter @Inject internal constructor(
+    private val contributionBoundaryCallback: ContributionBoundaryCallback,
+    private val contributionsRemoteDataSource: ContributionsRemoteDataSource,
+    private val contributionsRepository: ContributionsRepository,
+    private val uploadRepository: UploadRepository,
+    @param:Named(CommonsApplicationModule.IO_THREAD) private val ioThreadScheduler: Scheduler
+) : PendingUploadsContract.UserActionListener {
+    private val compositeDisposable = CompositeDisposable()
+
+    lateinit var totalContributionList: LiveData<PagedList<Contribution>>
+    lateinit var failedContributionList: LiveData<PagedList<Contribution>>
+
+    /**
+     * Setups the paged list of Pending Uploads. This method sets the configuration for paged list
+     * and ties it up with the live data object. This method can be tweaked to update the lazy
+     * loading behavior of the contributions list
+     */
+    fun setup() {
+        val pagedListConfig = PagedList.Config.Builder()
+            .setPrefetchDistance(50)
+            .setPageSize(10).build()
+
+        val factory = contributionsRepository.fetchContributionsWithStatesSortedByDateUploadStarted(
+            listOf(STATE_QUEUED, STATE_IN_PROGRESS, STATE_PAUSED)
+        )
+        totalContributionList = LivePagedListBuilder(factory, pagedListConfig).build()
+    }
+
+    /**
+     * Setups the paged list of Failed Uploads. This method sets the configuration for paged list
+     * and ties it up with the live data object. This method can be tweaked to update the lazy
+     * loading behavior of the contributions list
+     */
+    fun getFailedContributions() {
+        val pagedListConfig = PagedList.Config.Builder()
+            .setPrefetchDistance(50)
+            .setPageSize(10).build()
+
+        val factory = contributionsRepository.fetchContributionsWithStatesSortedByDateUploadStarted(
+            listOf(STATE_FAILED)
+        )
+        failedContributionList = LivePagedListBuilder(factory, pagedListConfig).build()
+    }
+
+    override fun onAttachView(view: PendingUploadsContract.View) {
+    }
+
+    override fun onDetachView() {
+        compositeDisposable.clear()
+        contributionsRemoteDataSource.dispose()
+        contributionBoundaryCallback.dispose()
+    }
+
+    /**
+     * Deletes the specified upload (contribution) from the database.
+     *
+     * @param contribution The contribution object representing the upload to be deleted.
+     * @param context      The context in which the operation is being performed.
+     */
+    override fun deleteUpload(contribution: Contribution?, context: Context?) {
+        compositeDisposable.add(
+            contributionsRepository
+                .deleteContributionFromDB(contribution)
+                .subscribeOn(ioThreadScheduler)
+                .subscribe()
+        )
+    }
+
+    /**
+     * Pauses all the uploads by changing the state of contributions from STATE_QUEUED and
+     * STATE_IN_PROGRESS to STATE_PAUSED in the database.
+     */
+    fun pauseUploads() {
+        CommonsApplication.isPaused = true
+        compositeDisposable.add(
+            contributionsRepository
+                .updateContributionsWithStates(
+                    listOf(STATE_QUEUED, STATE_IN_PROGRESS),
+                    STATE_PAUSED
+                )
+                .subscribeOn(ioThreadScheduler)
+                .subscribe()
+        )
+    }
+
+    /**
+     * Deletes contributions from the database that match the specified states.
+     *
+     * @param states A list of integers representing the states of the contributions to be deleted.
+     */
+    fun deleteUploads(states: List<Int>) {
+        compositeDisposable.add(
+            contributionsRepository
+                .deleteContributionsFromDBWithStates(states)
+                .subscribeOn(ioThreadScheduler)
+                .subscribe()
+        )
+    }
+
+    /**
+     * Restarts the uploads for the specified list of contributions starting from the given index.
+     *
+     * @param contributionList The list of contributions to be restarted.
+     * @param index            The starting index in the list from which to restart uploads.
+     * @param context          The context in which the operation is being performed.
+     */
+    fun restartUploads(contributionList: List<Contribution>, index: Int, context: Context) {
+        CommonsApplication.isPaused = false
+        if (index >= contributionList.size) {
+            return
+        }
+        val contribution = contributionList[index]
+        if (contribution.state == STATE_FAILED) {
+            contribution.dateUploadStarted = Calendar.getInstance().time
+            if (contribution.errorInfo == null) {
+                contribution.chunkInfo = null
+                contribution.transferred = 0
+            }
+            compositeDisposable.add(
+                uploadRepository
+                    .checkDuplicateImage(contribution.localUriPath!!.path)
+                    .subscribeOn(ioThreadScheduler)
+                    .subscribe({ imageCheckResult: Int ->
+                        if (imageCheckResult == IMAGE_OK) {
+                            contribution.state = STATE_QUEUED
+                            compositeDisposable.add(
+                                contributionsRepository
+                                    .save(contribution)
+                                    .subscribeOn(ioThreadScheduler)
+                                    .doOnComplete {
+                                        restartUploads(contributionList, index + 1, context)
+                                    }
+                                    .subscribe {
+                                        makeOneTimeWorkRequest(
+                                            context, ExistingWorkPolicy.KEEP
+                                        )
+                                    })
+                        } else {
+                            Timber.e("Contribution already exists")
+                            compositeDisposable.add(
+                                contributionsRepository
+                                    .deleteContributionFromDB(contribution)
+                                    .subscribeOn(ioThreadScheduler).doOnComplete {
+                                        restartUploads(contributionList, index + 1, context)
+                                    }
+                                    .subscribe())
+                        }
+                    }, { throwable: Throwable? ->
+                        Timber.e(throwable)
+                        restartUploads(contributionList, index + 1, context)
+                    })
+            )
+        } else {
+            contribution.state = STATE_QUEUED
+            compositeDisposable.add(
+                contributionsRepository
+                    .save(contribution)
+                    .subscribeOn(ioThreadScheduler)
+                    .doOnComplete {
+                        restartUploads(contributionList, index + 1, context)
+                    }
+                    .subscribe {
+                        makeOneTimeWorkRequest(context, ExistingWorkPolicy.KEEP)
+                    }
+            )
+        }
+    }
+
+    /**
+     * Restarts the upload for the specified list of contributions for the given index.
+     *
+     * @param contributionList The list of contributions.
+     * @param index            The index in the list which to be restarted.
+     * @param context          The context in which the operation is being performed.
+     */
+    fun restartUpload(contributionList: List<Contribution>, index: Int, context: Context) {
+        CommonsApplication.isPaused = false
+        if (index >= contributionList.size) {
+            return
+        }
+        val contribution = contributionList[index]
+        if (contribution.state == STATE_FAILED) {
+            contribution.dateUploadStarted = Calendar.getInstance().time
+            if (contribution.errorInfo == null) {
+                contribution.chunkInfo = null
+                contribution.transferred = 0
+            }
+            compositeDisposable.add(
+                uploadRepository
+                    .checkDuplicateImage(contribution.localUriPath!!.path)
+                    .subscribeOn(ioThreadScheduler)
+                    .subscribe { imageCheckResult: Int ->
+                        if (imageCheckResult == IMAGE_OK) {
+                            contribution.state = STATE_QUEUED
+                            compositeDisposable.add(
+                                contributionsRepository
+                                    .save(contribution)
+                                    .subscribeOn(ioThreadScheduler)
+                                    .subscribe {
+                                        makeOneTimeWorkRequest(context, ExistingWorkPolicy.KEEP)
+                                    }
+                            )
+                        } else {
+                            Timber.e("Contribution already exists")
+                            compositeDisposable.add(
+                                contributionsRepository
+                                    .deleteContributionFromDB(contribution)
+                                    .subscribeOn(ioThreadScheduler)
+                                    .subscribe()
+                            )
+                        }
+                    })
+        } else {
+            contribution.state = STATE_QUEUED
+            compositeDisposable.add(
+                contributionsRepository
+                    .save(contribution)
+                    .subscribeOn(ioThreadScheduler)
+                    .subscribe {
+                        makeOneTimeWorkRequest(context, ExistingWorkPolicy.KEEP)
+                    }
+            )
+        }
+    }
+}