Add schedule send message creation ui

Move android-smsmms logic into a separate file

app/src/main/kotlin/com/simplemobiletools/smsmessenger/helpers/Constants.kt

@@ -34,6 +34,8 @@ private const val PATH = "com.simplemobiletools.smsmessenger.action."
 const val MARK_AS_READ = PATH + "mark_as_read"
 const val REPLY = PATH + "reply"
 
+const val DATE_FORMAT_PATTERN = "dd MMM, YYYY"
+
 // view types for the thread list view
 const val THREAD_DATE_TIME = 1
 const val THREAD_RECEIVED_MESSAGE = 2

app/src/main/kotlin/com/simplemobiletools/smsmessenger/helpers/Messaging.kt

@@ -0,0 +1,59 @@
+package com.simplemobiletools.smsmessenger.helpers
+
+import android.content.Context
+import android.content.Intent
+import android.net.Uri
+import com.klinker.android.send_message.Settings
+import com.klinker.android.send_message.Transaction
+import com.klinker.android.send_message.Utils
+import com.simplemobiletools.commons.extensions.showErrorToast
+import com.simplemobiletools.smsmessenger.R
+import com.simplemobiletools.smsmessenger.extensions.config
+import com.simplemobiletools.smsmessenger.receivers.SmsStatusDeliveredReceiver
+import com.simplemobiletools.smsmessenger.receivers.SmsStatusSentReceiver
+
+fun Context.getSendMessageSettings(): Settings {
+    val settings = Settings()
+    settings.useSystemSending = true
+    settings.deliveryReports = config.enableDeliveryReports
+    settings.sendLongAsMms = config.sendLongMessageMMS
+    settings.sendLongAsMmsAfter = 1
+    settings.group = config.sendGroupMessageMMS
+    return settings
+}
+
+fun Context.sendTransactionMessage(text: String, addresses: List<String>, subscriptionId: Int?, attachments: List<Uri>) {
+    val settings = getSendMessageSettings()
+    if (subscriptionId != null) {
+        settings.subscriptionId = subscriptionId
+    }
+
+    val transaction = Transaction(this, settings)
+    val message = com.klinker.android.send_message.Message(text, addresses.toTypedArray())
+
+    if (attachments.isNotEmpty()) {
+        for (uri in attachments) {
+            try {
+                val byteArray = contentResolver.openInputStream(uri)?.readBytes() ?: continue
+                val mimeType = contentResolver.getType(uri) ?: continue
+                message.addMedia(byteArray, mimeType)
+            } catch (e: Exception) {
+                showErrorToast(e)
+            } catch (e: Error) {
+                showErrorToast(e.localizedMessage ?: getString(R.string.unknown_error_occurred))
+            }
+        }
+    }
+
+    val smsSentIntent = Intent(this, SmsStatusSentReceiver::class.java)
+    val deliveredIntent = Intent(this, SmsStatusDeliveredReceiver::class.java)
+
+    transaction.setExplicitBroadcastForSentSms(smsSentIntent)
+    transaction.setExplicitBroadcastForDeliveredSms(deliveredIntent)
+    transaction.sendNewMessage(message)
+}
+
+fun Context.isLongMmsMessage(text: String): Boolean {
+    val settings = getSendMessageSettings()
+    return Utils.getNumPages(settings, text) > settings.sendLongAsMmsAfter
+}