Snackbar for promoting Data Saver to existing users

chrome/android/java/src/org/chromium/chrome/browser/snackbar/DataReductionPromoSnackbarController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/snackbar/DataReductionPromoSnackbarController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/snackbar/DataReductionPromoSnackbarController.java b/chrome/android/java/src/org/chromium/chrome/browser/snackbar/DataReductionPromoSnackbarController.java
new file mode 100644
index 0000000000000000000000000000000000000000..03e9c0ec1a0e4dedd1b122829b2a5d3e9360db17
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/snackbar/DataReductionPromoSnackbarController.java
@@ -0,0 +1,137 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.snackbar;
+
+import android.content.Context;
+import android.content.Intent;
+
+import org.chromium.base.CommandLine;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.preferences.PreferencesLauncher;
+import org.chromium.chrome.browser.preferences.datareduction.DataReductionPreferences;
+import org.chromium.chrome.browser.preferences.datareduction.DataReductionPromoUtils;
+import org.chromium.chrome.browser.preferences.datareduction.DataReductionProxyUma;
+import org.chromium.components.variations.VariationsAssociatedData;
+
+/**
+ * The controller for the Data Reduction Proxy promo that lets users of the proxy know when Chrome
+ * has saved a given amount of data.
+ */
+public class DataReductionPromoSnackbarController implements SnackbarManager.SnackbarController {
+    /**
+     * A semi-colon delimited list of data saving values in MB that the promo should be shown
+     * for.
+     */
+    public static final String PROMO_PARAM_NAME = "snackbar_promo_data_savings_in_megabytes";
+
+    public static final String FROM_PROMO = "FromPromo";
+    public static final String PROMO_FIELD_TRIAL_NAME = "DataCompressionProxyPromoVisibility";
+    private static final String CLEAR_DATA_REDUCITON_PROXY_DATA_SAVINGS_SWITCH =
+            "clear-data-reduction-proxy-data-savings";
+    private static final long BYTES_PER_MEGABYTE = 1024 * 1024;
+    private static final long BYTES_PER_GIGABYTE = 1024 * 1024 * 1024;
+
+    private final SnackbarManager mSnackbarManager;
+    private final Context mContext;
+    private final int[] mPromoDataSavingsMB;
+
+    /**
+     * Creates an instance of a {@link DataReductionPromoSnackbarController}.
+     *
+     * @param context The {@link Context} in which snackbar is shown.
+     * @param snackbarManager The manager that helps to show the snackbar.
+     */
+    public DataReductionPromoSnackbarController(Context context, SnackbarManager snackbarManager) {
+        mSnackbarManager = snackbarManager;
+        mContext = context;
+
+        String variationParamValue = VariationsAssociatedData
+                .getVariationParamValue(PROMO_FIELD_TRIAL_NAME, PROMO_PARAM_NAME);
+
+        if (variationParamValue.isEmpty()) {
+            mPromoDataSavingsMB = new int[0];
+        } else {
+            variationParamValue = variationParamValue.replace(" ", "");
+            String[] promoDataSavingStrings = variationParamValue.split(";");
+            mPromoDataSavingsMB = new int[promoDataSavingStrings.length];
+
+            for (int i = 0; i < promoDataSavingStrings.length; i++) {
+                try {
+                    mPromoDataSavingsMB[i] = Integer.parseInt(promoDataSavingStrings[i]);
+                } catch (NumberFormatException e) {
+                    mPromoDataSavingsMB[i] = -1;
+                }
+            }
+        }
+
+        if (CommandLine.getInstance().hasSwitch(CLEAR_DATA_REDUCITON_PROXY_DATA_SAVINGS_SWITCH)) {
+            DataReductionPromoUtils.saveSnackbarPromoDisplayed(0);
+        }
+    }
+
+    /**
+     * Shows the Data Reduction Proxy promo snackbar if the current data savings are over
+     * specific thresholds set by finch and the snackbar has not been shown for that
+     *
+     * @param dataSavingInBytes The amount of data the Data Reduction Proxy has saved in bytes.
+     */
+    public void maybeShowDataReductionPromoSnackbar(long dataSavingInBytes) {
+        // Prevents users who upgrade and have already saved mPromoDataSavingsInMB from seeing the
+        // promo.
+        if (!DataReductionPromoUtils.hasSnackbarPromoBeenInitWithStartingContentLength()) {
+            DataReductionPromoUtils.saveSnackbarPromoInitWithStartingContentLength(
+                    dataSavingInBytes);
+            return;
+        }
+
+        for (int promoDataSavingMB : mPromoDataSavingsMB) {
+            long promoDataSavingBytes = promoDataSavingMB * BYTES_PER_MEGABYTE;
+            if (dataSavingInBytes > 0 && dataSavingInBytes >= promoDataSavingBytes

[tbansal1, 2016/10/25 18:10:04]

Would not this trigger if mPromoDataSavingsMB[i] was set to -1 in the try-catch
above?

[megjablon, 2016/10/25 22:14:19]

Good catch! dataSavingInBytes > 0 was meant to be promoDataSavingMB > 0. 

+                    && DataReductionPromoUtils
+                            .getDisplayedSnackbarPromoContentLength() < promoDataSavingBytes) {
+                mSnackbarManager.showSnackbar(Snackbar
+                        .make(getStringForBytes(promoDataSavingBytes),
+                                this,
+                                Snackbar.TYPE_NOTIFICATION, Snackbar.UMA_DATA_REDUCTION_PROMO)
+                        .setAction(
+                                mContext.getString(R.string.data_reduction_promo_snackbar_button),
+                                null));
+                DataReductionProxyUma.dataReductionProxySnackbarPromo(promoDataSavingMB);
+                DataReductionPromoUtils.saveSnackbarPromoDisplayed(dataSavingInBytes);
+                break;
+            }
+        }
+    }
+
+    private String getStringForBytes(long bytes) {
+        int resourceId;
+        int bytesInCorrectUnits;
+
+        if (bytes < BYTES_PER_GIGABYTE) {
+            resourceId =  R.string.data_reduction_promo_snackbar_text_mb;
+            bytesInCorrectUnits = (int) (bytes / BYTES_PER_MEGABYTE);
+        } else {
+            resourceId =  R.string.data_reduction_promo_snackbar_text_gb;
+            bytesInCorrectUnits = (int) (bytes / BYTES_PER_GIGABYTE);
+        }
+
+        return mContext.getResources().getString(resourceId, bytesInCorrectUnits);
+    }
+
+    @Override
+    public void onAction(Object actionData) {
+        assert mContext != null;
+        Intent intent = PreferencesLauncher.createIntentForSettingsPage(
+                mContext, DataReductionPreferences.class.getName());
+        intent.putExtra(FROM_PROMO, true);
+        mContext.startActivity(intent);
+    }
+
+    @Override
+    public void onDismissNoAction(Object actionData) {
+        DataReductionProxyUma.dataReductionProxyUIAction(
+                DataReductionProxyUma.ACTION_SNACKBAR_DISMISSED);
+    }
+}