save a draft while you are typing the post

app/src/main/java/com/vitorpamplona/amethyst/LocalPreferences.kt

@@ -111,6 +111,7 @@ private object PrefKeys {
     const val LOGIN_WITH_EXTERNAL_SIGNER = "login_with_external_signer"
     const val AUTOMATICALLY_SHOW_PROFILE_PICTURE = "automatically_show_profile_picture"
     const val SIGNER_PACKAGE_NAME = "signer_package_name"
+    const val NEW_POST_DRAFT = "draft_new_post"
 
     const val ALL_ACCOUNT_INFO = "all_saved_accounts_info"
     const val SHARED_SETTINGS = "shared_settings"
@@ -458,6 +459,30 @@ object LocalPreferences {
             }
         }
 
+    fun saveDraft(
+        message: String,
+        account: Account,
+    ) {
+        val prefs = encryptedPreferences(account.keyPair.pubKey.toNpub())
+        with(prefs.edit()) {
+            putString(PrefKeys.NEW_POST_DRAFT, message)
+            apply()
+        }
+    }
+
+    fun loadDraft(account: Account): String? {
+        val prefs = encryptedPreferences(account.keyPair.pubKey.toNpub())
+        return prefs.getString(PrefKeys.NEW_POST_DRAFT, "")
+    }
+
+    fun clearDraft(account: Account) {
+        val prefs = encryptedPreferences(account.keyPair.pubKey.toNpub())
+        with(prefs.edit()) {
+            remove(PrefKeys.NEW_POST_DRAFT)
+            apply()
+        }
+    }
+
     suspend fun innerLoadCurrentAccountFromEncryptedStorage(npub: String?): Account? =
         withContext(Dispatchers.IO) {
             checkNotInMainThread()

app/src/main/java/com/vitorpamplona/amethyst/ui/actions/NewPostViewModel.kt

@@ -35,6 +35,7 @@ import androidx.compose.ui.text.input.TextFieldValue
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import com.fonfon.kgeohash.toGeoHash
+import com.vitorpamplona.amethyst.LocalPreferences
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
@@ -213,6 +214,14 @@ open class NewPostViewModel() : ViewModel() {
         zapRaiserAmount = null
         forwardZapTo = Split()
         forwardZapToEditting = TextFieldValue("")
+
+        viewModelScope.launch(Dispatchers.IO) {
+            val draft = loadDraft()
+            if (draft != null) {
+                message = TextFieldValue(draft)
+                updateMessage(message)
+            }
+        }
     }
 
     fun sendPost(relayList: List<Relay>? = null) {
@@ -535,6 +544,10 @@ open class NewPostViewModel() : ViewModel() {
         userSuggestionAnchor = null
         userSuggestionsMainMessage = null
 
+        viewModelScope.launch(Dispatchers.IO) {
+            clearDraft()
+        }
+
         NostrSearchEventOrUserDataSource.clear()
     }
 
@@ -550,7 +563,24 @@ open class NewPostViewModel() : ViewModel() {
         pTags = pTags?.filter { it != userToRemove }
     }
 
+    open fun saveDraft(message: String) {
+        account?.let { LocalPreferences.saveDraft(message, it) }
+    }
+
+    open fun loadDraft(): String? {
+        account?.let { return LocalPreferences.loadDraft(it) }
+
+        return null
+    }
+
+    open fun clearDraft() {
+        account?.let { LocalPreferences.clearDraft(it) }
+    }
+
     open fun updateMessage(it: TextFieldValue) {
+        viewModelScope.launch(Dispatchers.IO) {
+            saveDraft(it.text)
+        }
         message = it
         urlPreview = findUrlInMessage()