Delete scheduled post after editing (#1947)

* Delete scheduled post after editing

This ensures that editing a scheduled toot will not duplicate it.

Fixes #1924

* Fix scheduled toot editing

* Convert isEditingScheduledToot to property

* Replace MediatorLiveData with combineLiveData

* Remove dead code

* Fix observer emission

* Fix "Finish media upload" appearing for split second

app/src/main/java/com/keylesspalace/tusky/SavedTootActivity.java

@@ -164,6 +164,7 @@ public final class SavedTootActivity extends BaseActivity implements SavedTootAd
         List<String> descriptions = gson.fromJson(item.getDescriptions(), stringListType);
 
         ComposeOptions composeOptions = new ComposeOptions(
+                /*scheduledTootUid*/null,
                 item.getUid(),
                 item.getText(),
                 jsonUrls,

app/src/main/java/com/keylesspalace/tusky/components/compose/ComposeActivity.kt

@@ -744,9 +744,11 @@ class ComposeActivity : BaseActivity(),
             composeEditField.error = getString(R.string.error_empty)
             enableButtons(true)
         } else if (characterCount <= maximumTootCharacters) {
+            if (viewModel.media.value!!.isNotEmpty()) {
                 finishingUploadDialog = ProgressDialog.show(
                         this, getString(R.string.dialog_title_finishing_media_upload),
                         getString(R.string.dialog_message_uploading_media), true, true)
+            }
 
             viewModel.sendStatus(contentText, spoilerText).observe(this, {
                 finishingUploadDialog?.dismiss()
@@ -1001,6 +1003,7 @@ class ComposeActivity : BaseActivity(),
     @Parcelize
     data class ComposeOptions(
             // Let's keep fields var until all consumers are Kotlin
+            var scheduledTootUid: String? = null,
             var savedTootUid: Int? = null,
             var tootText: String? = null,
             var mediaUrls: List<String>? = null,

app/src/main/java/com/keylesspalace/tusky/components/compose/ComposeViewModel.kt

@@ -19,8 +19,10 @@ import android.net.Uri
 import android.util.Log
 import androidx.core.net.toUri
 import androidx.lifecycle.LiveData
+import androidx.lifecycle.MediatorLiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.Observer
+import androidx.work.impl.utils.LiveDataUtils
 import com.keylesspalace.tusky.adapter.ComposeAutoCompleteAdapter
 import com.keylesspalace.tusky.components.compose.ComposeActivity.QueuedMedia
 import com.keylesspalace.tusky.components.search.SearchType
@@ -33,6 +35,8 @@ import com.keylesspalace.tusky.network.MastodonApi
 import com.keylesspalace.tusky.service.ServiceClient
 import com.keylesspalace.tusky.service.TootToSend
 import com.keylesspalace.tusky.util.*
+import io.reactivex.Observable.empty
+import io.reactivex.Observable.just
 import io.reactivex.disposables.Disposable
 import io.reactivex.rxkotlin.Singles
 import java.util.*
@@ -58,6 +62,7 @@ class ComposeViewModel
     private var replyingStatusContent: String? = null
     internal var startingText: String? = null
     private var savedTootUid: Int = 0
+    private var scheduledTootUid: String? = null
     private var startingContentWarning: String = ""
     private var inReplyToId: String? = null
     private var startingVisibility: Status.Visibility = Status.Visibility.UNKNOWN
@@ -94,6 +99,7 @@ class ComposeViewModel
 
     private val mediaToDisposable = mutableMapOf<Long, Disposable>()
 
+    private val isEditingScheduledToot get() = !scheduledTootUid.isNullOrEmpty()
 
     init {
 
@@ -241,7 +247,14 @@ class ComposeViewModel
             content: String,
             spoilerText: String
     ): LiveData<Unit> {
-        return media
+
+        val deletionObservable = if (isEditingScheduledToot) {
+            api.deleteScheduledStatus(scheduledTootUid.toString()).toObservable().map { Unit }
+        } else {
+            just(Unit)
+        }.toLiveData()
+
+        val sendObservable = media
                 .filter { items -> items.all { it.uploadPercent == -1 } }
                 .map {
                     val mediaIds = ArrayList<String>()
@@ -272,8 +285,13 @@ class ComposeViewModel
                             idempotencyKey = randomAlphanumericString(16),
                             retries = 0
                     )
+
                     serviceClient.sendToot(tootToSend)
                 }
+
+        return combineLiveData(deletionObservable, sendObservable) { _, _ -> Unit }
+
+
     }
 
     fun updateDescription(localId: Long, description: String): LiveData<Boolean> {
@@ -406,6 +424,7 @@ class ComposeViewModel
 
 
         savedTootUid = composeOptions?.savedTootUid ?: 0
+        scheduledTootUid = composeOptions?.scheduledTootUid
         startingText = composeOptions?.tootText
 
 

app/src/main/java/com/keylesspalace/tusky/components/scheduled/ScheduledTootActivity.kt

@@ -120,6 +120,7 @@ class ScheduledTootActivity : BaseActivity(), ScheduledTootActionListener, Injec
 
     override fun edit(item: ScheduledStatus) {
         val intent = ComposeActivity.startIntent(this, ComposeActivity.ComposeOptions(
+                scheduledTootUid = item.id,
                 tootText = item.params.text,
                 contentWarning = item.params.spoilerText,
                 mediaAttachments = item.mediaAttachments,