[fenix] For https://github.com/mozilla-mobile/fenix/issues/9425 - Handle undo for custom search engines

On undo, get the template that the user entered for that engine and then
re-add it to the `CustomSearchEngineStore`

app/src/main/java/org/mozilla/fenix/components/searchengine/FenixSearchEngineProvider.kt

@@ -135,24 +135,28 @@ open class FenixSearchEngineProvider(
         return installedSearchEngines(context)
     }
 
-    fun installSearchEngine(context: Context, searchEngine: SearchEngine) = runBlocking {
-        val installedIdentifiers = installedSearchEngineIdentifiers(context).toMutableSet()
-        installedIdentifiers.add(searchEngine.identifier)
-        prefs(context).edit().putStringSet(localeAwareInstalledEnginesKey(), installedIdentifiers).apply()
+    fun installSearchEngine(context: Context, searchEngine: SearchEngine, isCustom: Boolean = false) = runBlocking {
+        if (isCustom) {
+            val searchUrl = searchEngine.getSearchTemplate()
+            CustomSearchEngineStore.addSearchEngine(context, searchEngine.name, searchUrl)
+            reload()
+        } else {
+            val installedIdentifiers = installedSearchEngineIdentifiers(context).toMutableSet()
+            installedIdentifiers.add(searchEngine.identifier)
+            prefs(context).edit()
+                .putStringSet(localeAwareInstalledEnginesKey(), installedIdentifiers).apply()
+        }
     }
 
-    fun uninstallSearchEngine(context: Context, searchEngine: SearchEngine) = runBlocking {
-        val isCustom = CustomSearchEngineStore.isCustomSearchEngine(context, searchEngine.identifier)
-
+    fun uninstallSearchEngine(context: Context, searchEngine: SearchEngine, isCustom: Boolean = false) = runBlocking {
         if (isCustom) {
             CustomSearchEngineStore.removeSearchEngine(context, searchEngine.identifier)
+            reload()
         } else {
             val installedIdentifiers = installedSearchEngineIdentifiers(context).toMutableSet()
             installedIdentifiers.remove(searchEngine.identifier)
             prefs(context).edit().putStringSet(localeAwareInstalledEnginesKey(), installedIdentifiers).apply()
         }
-
-        reload()
     }
 
     fun reload() {

app/src/main/java/org/mozilla/fenix/settings/search/SearchEngineListPreference.kt

@@ -18,7 +18,10 @@ import androidx.core.view.isVisible
 import androidx.navigation.Navigation
 import androidx.preference.Preference
 import androidx.preference.PreferenceViewHolder
-import kotlinx.android.synthetic.main.search_engine_radio_button.view.*
+import kotlinx.android.synthetic.main.search_engine_radio_button.view.engine_icon
+import kotlinx.android.synthetic.main.search_engine_radio_button.view.engine_text
+import kotlinx.android.synthetic.main.search_engine_radio_button.view.overflow_menu
+import kotlinx.android.synthetic.main.search_engine_radio_button.view.radio_button
 import kotlinx.coroutines.MainScope
 import mozilla.components.browser.search.SearchEngine
 import mozilla.components.browser.search.provider.SearchEngineList
@@ -167,7 +170,7 @@ abstract class SearchEngineListPreference @JvmOverloads constructor(
         val initialEngineList = searchEngineList.copy()
         val initialDefaultEngine = searchEngineList.default
 
-        context.components.search.provider.uninstallSearchEngine(context, engine)
+        context.components.search.provider.uninstallSearchEngine(context, engine, isCustomSearchEngine)
 
         MainScope().allowUndo(
             view = context.getRootView()!!,
@@ -175,7 +178,7 @@ abstract class SearchEngineListPreference @JvmOverloads constructor(
                 .getString(R.string.search_delete_search_engine_success_message, engine.name),
             undoActionTitle = context.getString(R.string.snackbar_deleted_undo),
             onCancel = {
-                context.components.search.provider.installSearchEngine(context, engine)
+                context.components.search.provider.installSearchEngine(context, engine, isCustomSearchEngine)
 
                 searchEngineList = initialEngineList.copy(
                     default = initialDefaultEngine

app/src/test/java/org/mozilla/fenix/components/searchengine/FenixSearchEngineProviderTest.kt

@@ -3,6 +3,14 @@ package org.mozilla.fenix.components.searchengine
 import android.content.Context
 import io.mockk.every
 import io.mockk.mockk
+import android.graphics.Bitmap
+import io.mockk.Runs
+import io.mockk.coEvery
+import io.mockk.coVerify
+import io.mockk.every
+import io.mockk.just
+import io.mockk.mockk
+import io.mockk.mockkObject
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.ExperimentalCoroutinesApi
@@ -27,6 +35,12 @@ class FenixSearchEngineProviderTest {
     @Before
     fun before() {
         fenixSearchEngineProvider = FakeFenixSearchEngineProvider(testContext)
+        mockkObject(CustomSearchEngineStore)
+        fenixSearchEngineProvider.let {
+            every { CustomSearchEngineStore.loadCustomSearchEngines(testContext) } returns listOf(
+                (it as FakeFenixSearchEngineProvider).mockSearchEngine("my custom site", "my custom site")
+            )
+        }
     }
 
     /*
@@ -37,6 +51,28 @@ class FenixSearchEngineProviderTest {
         - the above after adding/removing
      */
 
+    @Suppress("DEPRECATION")
+    @Test
+    fun `add custom engine`() = runBlockingTest {
+        val engineName = "Ecosia"
+        val engineQuery = "www.ecosia.com/%s"
+        val searchEngine: SearchEngine = mockk(relaxed = true)
+        every { searchEngine.getSearchTemplate() } returns engineQuery
+        every { searchEngine.name } returns engineName
+        mockkObject(CustomSearchEngineStore)
+        coEvery {
+            CustomSearchEngineStore.addSearchEngine(
+                testContext,
+                engineName,
+                engineQuery
+            )
+        } just Runs
+
+        fenixSearchEngineProvider.installSearchEngine(testContext, searchEngine, true)
+
+        coVerify { CustomSearchEngineStore.addSearchEngine(testContext, engineName, engineQuery) }
+    }
+
     @Test
     fun `GIVEN sharedprefs does not contain installed engines WHEN installedSearchEngineIdentifiers THEN defaultEngines + customEngines ids are returned`() = runBlockingTest {
         val expectedDefaults = fenixSearchEngineProvider.baseSearchEngines.toIdSet()
@@ -96,21 +132,17 @@ class FakeFenixSearchEngineProvider(context: Context) : FenixSearchEngineProvide
         )
     )
 
-    override var customSearchEngines: Deferred<SearchEngineList>
-        get() {
-            return CompletableDeferred(
-                SearchEngineList(
-                    listOf(
-                        mockSearchEngine("my custom site", "my custom site")
-                    ), default = null
-                )
-            )
-        }
-        set(_) = throw NotImplementedError("Setting not currently supported on this fake")
+    override var customSearchEngines: Deferred<SearchEngineList> = CompletableDeferred(
+        SearchEngineList(
+            listOf(
+                mockSearchEngine("my custom site", "my custom site")
+            ), default = null
+        )
+    )
 
     override fun updateBaseSearchEngines() { }
 
-    private fun mockSearchEngine(
+    fun mockSearchEngine(
         id: String,
         n: String = id
     ): SearchEngine {