Default to Search Mode on Input Screen (#6411)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1210814996510638?focus=true

### Description

- Defaults the Input Screen to Search

### Steps to test this PR

- [x] Tap on the omnibar 
- [x] Verify that the Input Screen always opens in Search Mode

Author: joshliebe

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/store/InputScreenDataStore.kt

@@ -38,8 +38,6 @@ import com.duckduckgo.duckchat.impl.R
 import com.duckduckgo.duckchat.impl.databinding.FragmentInputScreenBinding
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.EditWithSelectedQuery
-import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.SwitchModeToChat
-import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.SwitchModeToSearch
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.SwitchToTab
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.UserSubmittedQuery
 import com.duckduckgo.duckchat.impl.inputscreen.ui.state.SubmitButtonIcon.GLOBE
@@ -154,14 +152,6 @@ class InputScreenFragment : DuckDuckGoFragment(R.layout.fragment_input_screen) {
                 requireActivity().setResult(Activity.RESULT_OK, data)
                 exitInterstitial()
             }
-            SwitchModeToSearch -> {
-                binding.viewPager.setCurrentItem(0, false)
-            }
-
-            SwitchModeToChat -> {
-                binding.viewPager.setCurrentItem(1, false)
-            }
-
             else -> {
                 // TODO handle other commands
             }

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/ui/InputScreenFragment.kt

@@ -24,6 +24,4 @@ sealed class Command {
     data class SwitchToTab(val tabId: String) : Command()
     data class UserSubmittedQuery(val query: String) : Command()
     data class EditWithSelectedQuery(val query: String) : Command()
-    data object SwitchModeToSearch : Command()
-    data object SwitchModeToChat : Command()
 }

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/ui/command/Command.kt

@@ -93,6 +93,8 @@ class InputModeWidget @JvmOverloads constructor(
         configureTabBehavior()
         applyModeSpecificInputBehaviour(isSearchTab = true)
         configureShadow()
+
+        onSearchSelected?.invoke()
     }
 
     fun provideInitialText(text: String) {

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/ui/view/InputModeWidget.kt

@@ -35,8 +35,6 @@ import com.duckduckgo.browser.api.autocomplete.AutoComplete.AutoCompleteSuggesti
 import com.duckduckgo.browser.api.autocomplete.AutoCompleteSettings
 import com.duckduckgo.common.utils.DispatcherProvider
 import com.duckduckgo.common.utils.SingleLiveEvent
-import com.duckduckgo.duckchat.impl.inputscreen.store.InputScreenDataStore
-import com.duckduckgo.duckchat.impl.inputscreen.store.InputScreenMode
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.AutocompleteItemRemoved
 import com.duckduckgo.duckchat.impl.inputscreen.ui.command.Command.EditWithSelectedQuery
@@ -83,7 +81,6 @@ class InputScreenViewModel @AssistedInject constructor(
     private val dispatchers: DispatcherProvider,
     private val history: NavigationHistory,
     @AppCoroutineScope private val appCoroutineScope: CoroutineScope,
-    private val inputScreenDataStore: InputScreenDataStore,
     private val voiceSearchAvailability: VoiceSearchAvailability,
     private val autoCompleteSettings: AutoCompleteSettings,
 ) : ViewModel() {
@@ -184,17 +181,6 @@ class InputScreenViewModel @AssistedInject constructor(
     val command: SingleLiveEvent<Command> = SingleLiveEvent()
 
     init {
-        viewModelScope.launch {
-            inputScreenDataStore.getLastUsedMode().let { mode ->
-                command.value = when (mode) {
-                    null,
-                    InputScreenMode.SEARCH,
-                    -> Command.SwitchModeToSearch
-                    InputScreenMode.CHAT -> Command.SwitchModeToChat
-                }
-            }
-        }
-
         combine(voiceServiceAvailable, voiceInputAllowed) { serviceAvailable, inputAllowed ->
             serviceAvailable && inputAllowed
         }.onEach { voiceInputPossible ->
@@ -315,7 +301,6 @@ class InputScreenViewModel @AssistedInject constructor(
 
     fun onSearchSelected() {
         viewModelScope.launch {
-            inputScreenDataStore.setLastUsedMode(InputScreenMode.SEARCH)
             _visibilityState.update {
                 it.copy(
                     forceWebSearchButtonVisible = false,
@@ -326,7 +311,6 @@ class InputScreenViewModel @AssistedInject constructor(
 
     fun onChatSelected() {
         viewModelScope.launch {
-            inputScreenDataStore.setLastUsedMode(InputScreenMode.CHAT)
             _visibilityState.update {
                 it.copy(
                     forceWebSearchButtonVisible = true,

duckchat/duckchat-impl/src/main/java/com/duckduckgo/duckchat/impl/inputscreen/ui/viewmodel/InputScreenViewModel.kt

@@ -8,7 +8,6 @@ import com.duckduckgo.browser.api.autocomplete.AutoComplete.AutoCompleteSuggesti
 import com.duckduckgo.browser.api.autocomplete.AutoComplete.AutoCompleteSuggestion.AutoCompleteSearchSuggestion
 import com.duckduckgo.browser.api.autocomplete.AutoCompleteSettings
 import com.duckduckgo.common.test.CoroutineTestRule
-import com.duckduckgo.duckchat.impl.inputscreen.store.InputScreenDataStore
 import com.duckduckgo.duckchat.impl.inputscreen.ui.state.SubmitButtonIcon
 import com.duckduckgo.duckchat.impl.inputscreen.ui.viewmodel.InputScreenViewModel
 import com.duckduckgo.history.api.NavigationHistory
@@ -43,7 +42,6 @@ class InputScreenViewModelTest {
     private val autoComplete: AutoComplete = mock()
     private val history: NavigationHistory = mock()
     private val appCoroutineScope: CoroutineScope = mock()
-    private val inputScreenDataStore: InputScreenDataStore = mock()
     private val voiceSearchAvailability: VoiceSearchAvailability = mock()
     private val autoCompleteSettings: AutoCompleteSettings = mock()
 
@@ -62,7 +60,6 @@ class InputScreenViewModelTest {
             dispatchers = coroutineRule.testDispatcherProvider,
             history = history,
             appCoroutineScope = appCoroutineScope,
-            inputScreenDataStore = inputScreenDataStore,
             voiceSearchAvailability = voiceSearchAvailability,
             autoCompleteSettings = autoCompleteSettings,
         )