Change Duck.ai auto-submit behavior (#5980)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1210096722341714?focus=true

### Description

- While on SERP, if the user is not currently typing in the address bar,
tapping the Duck.ai button will pre-fill the query in Duck.ai. The user
will then need to tap the submit button.
- If the user is typing, then the prompt will auto-submit.
- If the user opens Duck.ai while the current URL is in the address bar
then Duck.ai is opened without a prompt.

### Steps to test this PR

- [ ] On new tab, tap the Duck.ai button
- [ ] Verify that Duck.ai is opened without a prompt
- [ ] Go back
- [ ] Type something and tap the Duck.ai button
- [ ] Verify that Duck.ai is opened with auto-prompt
- [ ] Go back and submit the query
- [ ] Tap the address bar and then the Duck.ai button
- [ ] Verify that the prompt is pre-filled
- [ ] Go back
- [ ] Edit the query and tap the Duck.ai button
- [ ] Verify that Duck.ai is opened with auto-prompt
- [ ] Kill the app and reopen
- [ ] Tap the address bar and then the Duck.ai button
- [ ] Verify that the prompt is pre-filled


---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1210117788341374

Author: joshliebe

app/src/androidTest/java/com/duckduckgo/app/browser/BrowserTabViewModelTest.kt

@@ -6252,6 +6252,51 @@ class BrowserTabViewModelTest {
         verify(mockDuckChat, never()).openDuckChatWithAutoPrompt(any())
     }
 
+    @Test
+    fun whenOpenDuckChatWithQueryEqualToUrlThenOpenDuckChat() = runTest {
+        val url = "https://example.com"
+        loadUrl(url)
+
+        testee.openDuckChat(url)
+
+        verify(mockDuckChat).openDuckChat()
+        verify(mockDuckChat, never()).openDuckChatWithAutoPrompt(any())
+    }
+
+    @Test
+    fun whenOpenDuckChatWithLastSubmittedUserQueryThenOpenDuckChatWithQuery() = runTest {
+        val query = "example"
+        testee.setLastSubmittedUserQuery(query)
+
+        testee.openDuckChat(query)
+
+        verify(mockDuckChat).openDuckChat(query)
+        verify(mockDuckChat, never()).openDuckChatWithAutoPrompt(any())
+    }
+
+    @Test
+    fun whenLastSubmittedUserQueryIsNullAndOmnibarHasTextThenOpenDuckChatWithQuery() = runTest {
+        val query = "example"
+        testee.omnibarViewState.value = omnibarViewState().copy(omnibarText = "foo")
+
+        testee.openDuckChat(query)
+
+        verify(mockDuckChat).openDuckChat(query)
+        verify(mockDuckChat, never()).openDuckChatWithAutoPrompt(any())
+    }
+
+    @Test
+    fun whenLastSubmittedUserQueryDiffersFromNewQueryThenOpenWithAutoPrompt() = runTest {
+        val query = "example"
+        testee.setLastSubmittedUserQuery("foo")
+        testee.omnibarViewState.value = omnibarViewState().copy(omnibarText = "")
+
+        testee.openDuckChat(query)
+
+        verify(mockDuckChat).openDuckChatWithAutoPrompt(query)
+        verify(mockDuckChat, never()).openDuckChat()
+    }
+
     private fun aCredential(): LoginCredentials {
         return LoginCredentials(domain = null, username = null, password = null)
     }

app/src/main/java/com/duckduckgo/app/browser/BrowserTabFragment.kt

@@ -2800,6 +2800,7 @@ class BrowserTabFragment :
     }
 
     private fun userEnteredQuery(query: String) {
+        viewModel.setLastSubmittedUserQuery(query)
         viewModel.onUserSubmittedQuery(query)
     }
 

app/src/main/java/com/duckduckgo/app/browser/BrowserTabViewModel.kt

@@ -571,6 +571,7 @@ class BrowserTabViewModel @Inject constructor(
     private var isProcessingTrackingLink = false
     private var isLinkOpenedInNewTab = false
     private var allowlistRefreshTriggerJob: Job? = null
+    private var lastSubmittedUserQuery: String? = null
 
     private val fireproofWebsitesObserver = Observer<List<FireproofWebsiteEntity>> {
         browserViewState.value = currentBrowserViewState().copy(isFireproofWebsite = isFireproofWebsite())
@@ -4102,12 +4103,18 @@ class BrowserTabViewModel @Inject constructor(
         senseOfProtectionExperiment.firePrivacyDashboardClickedPixelIfInExperiment()
     }
 
-    fun openDuckChat(query: String?) {
-        if (query?.isNotEmpty() == true) {
-            duckChat.openDuckChatWithAutoPrompt(query)
-        } else {
-            duckChat.openDuckChat()
-        }
+    fun openDuckChat(query: String?) = when {
+        query.isNullOrBlank() || query == url -> duckChat.openDuckChat()
+
+        query == lastSubmittedUserQuery ||
+            (lastSubmittedUserQuery == null && !omnibarViewState.value?.omnibarText.isNullOrBlank())
+        -> duckChat.openDuckChat(query)
+
+        else -> duckChat.openDuckChatWithAutoPrompt(query)
+    }
+
+    fun setLastSubmittedUserQuery(query: String) {
+        lastSubmittedUserQuery = query
     }
 
     companion object {