[fenix] Closes https://github.com/mozilla-mobile/fenix/issues/17531: Use top sites count fact for top sites telemetry (https://github.com/mozilla-mobile/fenix/pull/17664)

app/src/main/java/org/mozilla/fenix/components/metrics/Event.kt

@@ -205,6 +205,9 @@ sealed class Event {
     object ContextMenuSelectAllTapped : Event()
     object ContextMenuShareTapped : Event()
 
+    object HaveTopSites : Event()
+    object HaveNoTopSites : Event()
+
     // Interaction events with extras
 
     data class TopSiteSwipeCarousel(val page: Int) : Event() {

app/src/main/java/org/mozilla/fenix/components/metrics/GleanMetricsService.kt

@@ -726,6 +726,12 @@ private val Event.wrapper: EventWrapper<*>?
         Event.HaveNoOpenTabs -> EventWrapper<NoExtraKeys>(
             { Metrics.hasOpenTabs.set(false) }
         )
+        Event.HaveTopSites -> EventWrapper<NoExtraKeys>(
+            { Metrics.hasTopSites.set(true) }
+        )
+        Event.HaveNoTopSites -> EventWrapper<NoExtraKeys>(
+            { Metrics.hasTopSites.set(false) }
+        )
 
         // Don't record other events in Glean:
         is Event.AddBookmark -> null

app/src/main/java/org/mozilla/fenix/components/metrics/MetricController.kt

@@ -22,6 +22,7 @@ import mozilla.components.feature.findinpage.facts.FindInPageFacts
 import mozilla.components.feature.media.facts.MediaFacts
 import mozilla.components.feature.prompts.dialog.LoginDialogFacts
 import mozilla.components.feature.pwa.ProgressiveWebAppFacts
+import mozilla.components.feature.top.sites.facts.TopSitesFacts
 import mozilla.components.support.base.Component
 import mozilla.components.support.base.facts.Action
 import mozilla.components.support.base.facts.Fact
@@ -134,6 +135,13 @@ internal class ReleaseMetricController(
             }
     }
 
+    @VisibleForTesting
+    internal fun factToEvent(
+        fact: Fact
+    ): Event? {
+        return fact.toEvent()
+    }
+
     private fun isInitialized(type: MetricServiceType): Boolean = initialized.contains(type)
 
     private fun isTelemetryEnabled(type: MetricServiceType): Boolean = when (type) {
@@ -242,6 +250,23 @@ internal class ReleaseMetricController(
         Component.FEATURE_PWA to ProgressiveWebAppFacts.Items.INSTALL_SHORTCUT -> {
             Event.ProgressiveWebAppInstallAsShortcut
         }
+        Component.FEATURE_TOP_SITES to TopSitesFacts.Items.COUNT -> {
+            value?.let {
+                var count = 0
+                try {
+                    count = it.toInt()
+                } catch (e: NumberFormatException) {
+                    // Do nothing
+                }
+
+                return if (count > 0) {
+                    Event.HaveTopSites
+                } else {
+                    Event.HaveNoTopSites
+                }
+            }
+            null
+        }
         else -> null
     }
 

app/src/test/java/org/mozilla/fenix/components/metrics/MetricControllerTest.kt

@@ -10,7 +10,12 @@ import io.mockk.impl.annotations.MockK
 import io.mockk.mockk
 import io.mockk.verify
 import io.mockk.verifyAll
+import mozilla.components.feature.top.sites.facts.TopSitesFacts
+import mozilla.components.support.base.Component
+import mozilla.components.support.base.facts.Action
+import mozilla.components.support.base.facts.Fact
 import mozilla.components.support.base.log.logger.Logger
+import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Test
 
@@ -167,4 +172,59 @@ class MetricControllerTest {
         controller.track(Event.TabMediaPause)
         verify { marketingService1.track(Event.TabMediaPause) }
     }
+
+    @Test
+    fun `topsites fact should convert to the right events`() {
+        var enabled = true
+        val controller = ReleaseMetricController(
+            services = listOf(dataService1),
+            isDataTelemetryEnabled = { enabled },
+            isMarketingDataTelemetryEnabled = { enabled }
+        )
+
+        var fact = Fact(
+            Component.FEATURE_TOP_SITES,
+            Action.INTERACTION,
+            TopSitesFacts.Items.COUNT,
+            "1"
+        )
+
+        assertEquals(controller.factToEvent(fact), Event.HaveTopSites)
+
+        fact = Fact(
+            Component.FEATURE_TOP_SITES,
+            Action.INTERACTION,
+            TopSitesFacts.Items.COUNT,
+            "0"
+        )
+
+        assertEquals(controller.factToEvent(fact), Event.HaveNoTopSites)
+
+        fact = Fact(
+            Component.FEATURE_TOP_SITES,
+            Action.INTERACTION,
+            TopSitesFacts.Items.COUNT,
+            "10"
+        )
+
+        assertEquals(controller.factToEvent(fact), Event.HaveTopSites)
+
+        fact = Fact(
+            Component.FEATURE_TOP_SITES,
+            Action.INTERACTION,
+            TopSitesFacts.Items.COUNT,
+            "-4"
+        )
+
+        assertEquals(controller.factToEvent(fact), Event.HaveNoTopSites)
+
+        fact = Fact(
+            Component.FEATURE_TOP_SITES,
+            Action.INTERACTION,
+            TopSitesFacts.Items.COUNT,
+            "test"
+        )
+
+        assertEquals(controller.factToEvent(fact), Event.HaveNoTopSites)
+    }
 }