DirectProfileDownloadActivity: Handle more potential cases

e.g. we can skip the slot selection dialog if there is only one chip in
the device.

app-common/src/main/java/im/angry/openeuicc/ui/DirectProfileDownloadActivity.kt

@@ -3,7 +3,7 @@ package im.angry.openeuicc.ui
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.lifecycle.lifecycleScope
-import im.angry.openeuicc.util.openEuiccApplication
+import im.angry.openeuicc.util.*
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -16,8 +16,21 @@ class DirectProfileDownloadActivity : AppCompatActivity(), SlotSelectFragment.Sl
                 openEuiccApplication.euiccChannelManager.enumerateEuiccChannels()
             }
 
-            SlotSelectFragment.newInstance()
-                .show(supportFragmentManager, SlotSelectFragment.TAG)
+            val knownChannels = openEuiccApplication.euiccChannelManager.knownChannels
+            when {
+                knownChannels.isEmpty() -> {
+                    finish()
+                }
+                knownChannels.hasMultipleChips -> {
+                    SlotSelectFragment.newInstance()
+                        .show(supportFragmentManager, SlotSelectFragment.TAG)
+                }
+                else -> {
+                    // If the device has only one eSIM "chip" (but may be mapped to multiple slots),
+                    // we can skip the slot selection dialog since there is only one chip to save to.
+                    onSlotSelected(knownChannels[0].slotId, knownChannels[0].portId)
+                }
+            }
         }
     }
 

app-common/src/main/java/im/angry/openeuicc/util/Utils.kt

@@ -2,6 +2,7 @@ package im.angry.openeuicc.util
 
 import android.content.Context
 import android.content.pm.PackageManager
+import im.angry.openeuicc.core.EuiccChannel
 import net.typeblog.lpac_jni.LocalProfileInfo
 import java.lang.RuntimeException
 
@@ -15,4 +16,7 @@ val Context.selfAppVersion: String
         }
 
 val LocalProfileInfo.isEnabled: Boolean
-    get() = state == LocalProfileInfo.State.Enabled
+    get() = state == LocalProfileInfo.State.Enabled
+
+val List<EuiccChannel>.hasMultipleChips: Boolean
+    get() = distinctBy { it.slotId }.size > 1