Bug 1812518 - Show the 3rd party download dialog as an Android View

This uses the same direction as the before patch - inflating a new View that
can then serve as an anchor for the Snackbar.
Here we could use directly the AC layout as it needed no special customization.

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -110,6 +110,7 @@ import org.mozilla.fenix.downloads.DownloadService
 import org.mozilla.fenix.downloads.DynamicDownloadDialog
 import org.mozilla.fenix.downloads.FirstPartyDownloadDialog
 import org.mozilla.fenix.downloads.StartDownloadDialog
+import org.mozilla.fenix.downloads.ThirdPartyDownloadDialog
 import org.mozilla.fenix.ext.accessibilityManager
 import org.mozilla.fenix.ext.breadcrumb
 import org.mozilla.fenix.ext.components
@@ -511,6 +512,18 @@ abstract class BaseBrowserFragment :
                     currentStartDownloadDialog = it
                 }
             },
+            customThirdPartyDownloadDialog = { downloaderApps, onAppSelected, negativeActionCallback ->
+                ThirdPartyDownloadDialog(
+                    activity = requireActivity(),
+                    downloaderApps = downloaderApps.value,
+                    onAppSelected = onAppSelected.value,
+                    negativeButtonAction = negativeActionCallback.value,
+                ).onDismiss {
+                    currentStartDownloadDialog = null
+                }.show(binding.startDownloadDialogContainer).also {
+                    currentStartDownloadDialog = it
+                }
+            },
         )
 
         downloadFeature.onDownloadStopped = { downloadState, _, downloadJobStatus ->

app/src/main/java/org/mozilla/fenix/downloads/StartDownloadDialog.kt

@@ -20,7 +20,10 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.ViewCompat
 import androidx.core.view.children
 import androidx.viewbinding.ViewBinding
+import mozilla.components.feature.downloads.databinding.MozacDownloaderChooserPromptBinding
 import mozilla.components.feature.downloads.toMegabyteOrKilobyteString
+import mozilla.components.feature.downloads.ui.DownloaderApp
+import mozilla.components.feature.downloads.ui.DownloaderAppAdapter
 import mozilla.components.support.ktx.android.view.setNavigationBarTheme
 import mozilla.components.support.ktx.android.view.setStatusBarTheme
 import org.mozilla.fenix.R
@@ -210,3 +213,36 @@ class FirstPartyDownloadDialog(
         }
     }
 }
+
+/**
+ * A download view mimicking a modal dialog that presents the user with a list of all apps
+ * that can handle the download request.
+ *
+ * @param activity The [Activity] in which the dialog will be shown.
+ * Used to update the activity [Window] to best mimic a modal dialog.
+ * @param downloaderApps List of all applications that can handle the download request.
+ * @param onAppSelected Callback for when the user chooses a specific application to handle the download request.
+ * @param negativeButtonAction Callback for when the user interacts with the dialog to dismiss it.
+ */
+class ThirdPartyDownloadDialog(
+    private val activity: Activity,
+    private val downloaderApps: List<DownloaderApp>,
+    private val onAppSelected: (DownloaderApp) -> Unit,
+    private val negativeButtonAction: () -> Unit,
+) : StartDownloadDialog(activity) {
+    override fun setupView() {
+        val dialog = MozacDownloaderChooserPromptBinding.inflate(LayoutInflater.from(activity), container, true)
+            .also { binding = it }
+
+        val recyclerView = dialog.appsList
+        recyclerView.adapter = DownloaderAppAdapter(activity, downloaderApps) { app ->
+            onAppSelected(app)
+            dismiss()
+        }
+
+        dialog.closeButton.setOnClickListener {
+            negativeButtonAction()
+            dismiss()
+        }
+    }
+}

app/src/test/java/org/mozilla/fenix/downloads/ThirdPartyDownloadDialogTest.kt

+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.downloads
+
+import android.app.Activity
+import android.widget.FrameLayout
+import io.mockk.Runs
+import io.mockk.every
+import io.mockk.just
+import io.mockk.mockk
+import io.mockk.spyk
+import io.mockk.verify
+import mozilla.components.feature.downloads.databinding.MozacDownloaderChooserPromptBinding
+import mozilla.components.support.test.robolectric.testContext
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mozilla.fenix.R
+import org.mozilla.fenix.helpers.FenixRobolectricTestRunner
+import org.robolectric.Robolectric
+
+@RunWith(FenixRobolectricTestRunner::class)
+class ThirdPartyDownloadDialogTest {
+    private val activity: Activity = Robolectric.buildActivity(Activity::class.java).create().get()
+
+    @Test
+    fun `GIVEN a list of downloader apps WHEN setting it's View THEN bind all provided download data`() {
+        var wasNegativeActionDone = false
+        val dialog = spyk(
+            ThirdPartyDownloadDialog(
+                activity = activity,
+                downloaderApps = listOf(mockk(), mockk()),
+                onAppSelected = { /* cannot test the viewholder click */ },
+                negativeButtonAction = { wasNegativeActionDone = true },
+            ),
+        )
+        every { dialog.dismiss() } just Runs
+        val dialogParent = FrameLayout(testContext)
+        dialog.container = dialogParent
+
+        dialog.setupView()
+
+        assertEquals(1, dialogParent.childCount)
+        assertEquals(R.id.relativeLayout, dialogParent.getChildAt(0).id)
+        val dialogBinding = dialog.binding as MozacDownloaderChooserPromptBinding
+        assertEquals(2, dialogBinding.appsList.adapter?.itemCount)
+        dialogBinding.closeButton.callOnClick()
+        assertTrue(wasNegativeActionDone)
+        verify { dialog.dismiss() }
+    }
+}