// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/share/default_ranking.h"

#include <array>
#include <string_view>

#include "base/containers/span.h"
#include "base/strings/strcat.h"
#include "base/strings/string_util.h"

namespace sharing {

namespace {

// All four of these rankings are sourced from a combination of public app usage
// data sets and Chrome-side metrics about common share targets; the exact
// details of that process are described in go/sh-plus.
//
// These are lists of activities rather than packages, so that multiple share
// targets from the same app can appear in different places in the ranking. This
// is a bit brittle; see https://crbug.com/40773850#comment5 for why.
// Regrettably, the mapping from human-readable (app name, action) pairs to
// activities was done by hand; see go/sh-3p-activities for that.
//
// These lists are used to rank which share targets are shown for users with no
// share history. In all cases, only apps actually present on the device are
// shown; these lists control the relative ordering when many of these apps are
// all present at once. Once the user has any share history, ShareRanking will
// use that history rather than these default lists.
//
// You'll notice that this data is split up by "EnUs" and "World"; this is
// because the popularity of apps around the world in general is pretty similar,
// *except* for en-US users, who have pretty major differences. If other locales
// diverge more from the main world list we will need to add more cases here for
// them.

struct ComponentName {
  std::string_view package;
  std::string_view activity;
};

constexpr auto kEnUsImageRanking = std::to_array<ComponentName>({
    {"com.whatsapp", "com.whatsapp.ContactPicker"},
    {"com.google.android.apps.messaging",
     "com.google.android.apps.messaging.ui.conversationlist."
     "ShareIntentActivity"},
    {"com.google.android.gm",
     "com.google.android.gm.ComposeActivityGmailExternal"},
    {"com.facebook.orca", "com.facebook.messenger.intents.ShareIntentHandler"},
    {"com.facebook.katana",
     "com.facebook.composer.shareintent."
     "ImplicitShareIntentHandlerDefaultAlias"},
    {"com.google.android.apps.photos",
     "com.google.android.apps.photos.uploadtoalbum.UploadContentActivity"},
    {
        "com.snapchat.android",
        "com.snap.mushroom.MainActivity",
    },
    {
        "org.telegram.messenger",
        "org.telegram.ui.LaunchActivity",
    },
    {"com.instagram.android",
     "com.instagram.share.handleractivity.StoryShareHandlerActivity"},
    {"com.instagram.android",
     "com.instagram.share.handleractivity.ShareHandlerActivity"},
    {"com.discord", "com.discord.app.AppActivity$AppAction"},
    {"com.instagram.android",
     "com.instagram.direct.share.handler."
     "DirectExternalMediaShareActivityPhoto"},
    {
        "com.google.android.talk",
        "com.google.android.apps.hangouts.phone.ShareIntentActivity",
    },
    {
        "com.google.android.keep",
        "com.google.android.keep.activities.ShareReceiverActivity",
    },
    {
        "com.google.android.apps.docs.editors.docs",
        "com.google.android.apps.docs.common.shareitem.UploadMenuActivity",
    },
    {
        "com.verizon.messaging.vzmsgs",
        "com.verizon.mms.ui.LaunchConversationActivity",
    },
    {
        "org.thoughtcrime.securesms",
        "org.thoughtcrime.securesms.sharing.ShareActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.composer.ComposerActivity",
    },
    {
        "com.pinterest",
        "com.pinterest.activity.create.PinItActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.app.dm.DMActivity",
    },
    {
        "com.google.android.apps.dynamite",
        "com.google.android.apps.dynamite.activity.main.MainActivity",
    },
    {
        "com.microsoft.office.outlook",
        "com.microsoft.office.outlook.compose.ComposeLauncherActivity",
    },
    {
        "com.yahoo.mobile.client.android.mail",
        "com.yahoo.mail.flux.ui.MailComposeActivity",
    },
    {
        "com.linkedin.android",
        "com.linkedin.android.publishing.sharing.SharingDeepLinkActivity",
    },
    {
        "com.reddit.frontpage",
        "com.reddit.sharing.ShareActivity",
    },
    {
        "jp.naver.line.android",
        "com.linecorp.line.share.common.view.FullPickerLaunchActivity",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareImgUI",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareToTimeLineUI",
    },
});

constexpr auto kEnUsTextRanking = std::to_array<ComponentName>({
    {"com.whatsapp", "com.whatsapp.ContactPicker"},
    {"com.google.android.apps.messaging",
     "com.google.android.apps.messaging.ui.conversationlist."
     "ShareIntentActivity"},
    {"com.google.android.gm",
     "com.google.android.gm.ComposeActivityGmailExternal"},
    {"com.facebook.orca", "com.facebook.messenger.intents.ShareIntentHandler"},
    {"com.facebook.katana",
     "com.facebook.composer.shareintent."
     "ImplicitShareIntentHandlerDefaultAlias"},
    {
        "com.snapchat.android",
        "com.snap.mushroom.MainActivity",
    },
    {
        "org.telegram.messenger",
        "org.telegram.ui.LaunchActivity",
    },
    {"com.discord", "com.discord.app.AppActivity$AppAction"},
    {"com.instagram.android",
     "com.instagram.direct.share.handler."
     "DirectExternalMediaShareActivityPhoto"},
    {
        "com.google.android.talk",
        "com.google.android.apps.hangouts.phone.ShareIntentActivity",
    },
    {
        "com.google.android.keep",
        "com.google.android.keep.activities.ShareReceiverActivity",
    },
    {
        "com.verizon.messaging.vzmsgs",
        "com.verizon.mms.ui.LaunchConversationActivity",
    },
    {
        "org.thoughtcrime.securesms",
        "org.thoughtcrime.securesms.sharing.ShareActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.composer.ComposerActivity",
    },
    {
        "com.pinterest",
        "com.pinterest.activity.create.PinItActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.app.dm.DMActivity",
    },
    {
        "com.ideashower.readitlater.pro",
        "com.ideashower.readitlater.activity.AddActivity",
    },
    {
        "com.google.android.apps.dynamite",
        "com.google.android.apps.dynamite.activity.main.MainActivity",
    },
    {
        "com.google.android.apps.docs.editors.docs",
        "com.google.android.apps.docs.common.shareitem.UploadMenuActivity",
    },
    {
        "com.microsoft.office.outlook",
        "com.microsoft.office.outlook.compose.ComposeLauncherActivity",
    },
    {
        "com.yahoo.mobile.client.android.mail",
        "com.yahoo.mail.flux.ui.MailComposeActivity",
    },
    {
        "com.linkedin.android",
        "com.linkedin.android.publishing.sharing.SharingDeepLinkActivity",
    },
    {
        "com.reddit.frontpage",
        "com.reddit.sharing.ShareActivity",
    },
    {
        "jp.naver.line.android",
        "com.linecorp.line.share.common.view.FullPickerLaunchActivity",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareImgUI",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareToTimeLineUI",
    },
});

constexpr auto kWorldImageRanking = std::to_array<ComponentName>({
    {"com.whatsapp", "com.whatsapp.ContactPicker"},
    {"com.google.android.apps.messaging",
     "com.google.android.apps.messaging.ui.conversationlist."
     "ShareIntentActivity"},
    {"com.facebook.orca", "com.facebook.messenger.intents.ShareIntentHandler"},
    {"com.google.android.gm",
     "com.google.android.gm.ComposeActivityGmailExternal"},
    {"com.instagram.android",
     "com.instagram.share.handleractivity.ShareHandlerActivity"},
    {"com.instagram.android",
     "com.instagram.share.handleractivity.StoryShareHandlerActivity"},
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareToTimeLineUI",
    },
    {
        "org.telegram.messenger",
        "org.telegram.ui.LaunchActivity",
    },
    {"com.facebook.katana",
     "com.facebook.composer.shareintent."
     "ImplicitShareIntentHandlerDefaultAlias"},
    {
        "jp.naver.line.android",
        "com.linecorp.line.share.common.view.FullPickerLaunchActivity",
    },
    {
        "com.google.android.talk",
        "com.google.android.apps.hangouts.phone.ShareIntentActivity",
    },
    {"com.google.android.apps.photos",
     "com.google.android.apps.photos.uploadtoalbum.UploadContentActivity"},
    {
        "com.google.android.apps.docs.editors.docs",
        "com.google.android.apps.docs.common.shareitem.UploadMenuActivity",
    },
    {"com.instagram.android",
     "com.instagram.direct.share.handler."
     "DirectExternalMediaShareActivityPhoto"},
    {
        "com.google.android.keep",
        "com.google.android.keep.activities.ShareReceiverActivity",
    },
    {
        "com.snapchat.android",
        "com.snap.mushroom.MainActivity",
    },
    {"com.discord", "com.discord.app.AppActivity$AppAction"},
    {
        "com.twitter.android",
        "com.twitter.composer.ComposerActivity",
    },
    // TODO(crbug.com/40777253): Whatsapp Business
    {
        "com.pinterest",
        "com.pinterest.activity.create.PinItActivity",
    },
    {
        "com.linkedin.android",
        "com.linkedin.android.publishing.sharing.SharingDeepLinkActivity",
    },
    {
        "com.facebook.mlite",
        "com.facebook.mlite.share.view.ShareActivity",
    },
    {
        "org.thoughtcrime.securesms",
        "org.thoughtcrime.securesms.sharing.ShareActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.app.dm.DMActivity",
    },
    {
        "com.facebook.lite",
        "com.facebook.lite.stories.activities.ShareToFbStoriesAlias",
    },
    {
        "com.microsoft.office.outlook",
        "com.microsoft.office.outlook.compose.ComposeLauncherActivity",
    },
    {
        "com.yahoo.mobile.client.android.mail",
        "com.yahoo.mail.flux.ui.MailComposeActivity",
    },
    {
        "com.viber.voip",
        "com.viber.voip.WelcomeShareActivity",
    },
    {
        "com.imo.android.imoim",
        "com.imo.android.imoim.globalshare.SharingActivity2",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareImgUI",
    },
    {
        "com.verizon.messaging.vzmsgs",
        "com.verizon.mms.ui.LaunchConversationActivity",
    },
    {
        "com.google.android.apps.dynamite",
        "com.google.android.apps.dynamite.activity.main.MainActivity",
    },
});

constexpr auto kWorldTextRanking = std::to_array<ComponentName>({
    {"com.whatsapp", "com.whatsapp.ContactPicker"},
    {"com.google.android.apps.messaging",
     "com.google.android.apps.messaging.ui.conversationlist."
     "ShareIntentActivity"},
    {"com.facebook.orca", "com.facebook.messenger.intents.ShareIntentHandler"},
    {"com.google.android.gm",
     "com.google.android.gm.ComposeActivityGmailExternal"},
    {
        "org.telegram.messenger",
        "org.telegram.ui.LaunchActivity",
    },
    {"com.facebook.katana",
     "com.facebook.composer.shareintent."
     "ImplicitShareIntentHandlerDefaultAlias"},
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareToTimeLineUI",
    },
    {
        "com.google.android.talk",
        "com.google.android.apps.hangouts.phone.ShareIntentActivity",
    },
    {
        "jp.naver.line.android",
        "com.linecorp.line.share.common.view.FullPickerLaunchActivity",
    },
    {
        "com.google.android.keep",
        "com.google.android.keep.activities.ShareReceiverActivity",
    },
    {
        "com.snapchat.android",
        "com.snap.mushroom.MainActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.composer.ComposerActivity",
    },
    {"com.discord", "com.discord.app.AppActivity$AppAction"},
    // TODO(crbug.com/40777253): Whatsapp Business
    {
        "com.ideashower.readitlater.pro",
        "com.ideashower.readitlater.activity.AddActivity",
    },
    {
        "com.google.android.apps.docs.editors.docs",
        "com.google.android.apps.docs.common.shareitem.UploadMenuActivity",
    },
    {
        "com.pinterest",
        "com.pinterest.activity.create.PinItActivity",
    },
    {
        "com.linkedin.android",
        "com.linkedin.android.publishing.sharing.SharingDeepLinkActivity",
    },
    {
        "com.facebook.mlite",
        "com.facebook.mlite.share.view.ShareActivity",
    },
    {
        "org.thoughtcrime.securesms",
        "org.thoughtcrime.securesms.sharing.ShareActivity",
    },
    {
        "com.twitter.android",
        "com.twitter.app.dm.DMActivity",
    },
    {
        "com.facebook.lite",
        "com.facebook.lite.stories.activities.ShareToFbStoriesAlias",
    },
    {
        "com.microsoft.office.outlook",
        "com.microsoft.office.outlook.compose.ComposeLauncherActivity",
    },
    {
        "com.yahoo.mobile.client.android.mail",
        "com.yahoo.mail.flux.ui.MailComposeActivity",
    },
    {
        "com.viber.voip",
        "com.viber.voip.WelcomeShareActivity",
    },
    {
        "com.imo.android.imoim",
        "com.imo.android.imoim.globalshare.SharingActivity2",
    },
    {
        "com.reddit.frontpage",
        "com.reddit.sharing.ShareActivity",
    },
    {
        "com.tencent.mm",
        "com.tencent.mm.ui.tools.ShareImgUI",
    },
    {
        "com.verizon.messaging.vzmsgs",
        "com.verizon.mms.ui.LaunchConversationActivity",
    },
    {
        "com.google.android.apps.dynamite",
        "com.google.android.apps.dynamite.activity.main.MainActivity",
    },
});

bool IsImageType(const std::string& type) {
  // TODO(ellyjones): The type string here comes from the Android side, which is
  // where the decision about image vs other is made - should we use a constant
  // for this, or an enum of ints instead?
  return type == "image";
}

bool IsEnUsLocale(const std::string& locale) {
  // TODO(ellyjones): This seems very unprincipled.
  return base::StartsWith(locale, "en_US");
}

std::vector<std::string> FlattenComponents(
    base::span<const ComponentName> components) {
  std::vector<std::string> result;
  result.reserve(components.size());
  for (const ComponentName& component : components) {
    // Note: the format of this string must match that returned by
    // android.content.ComponentName#flattenToString
    result.push_back(
        base::StrCat({component.package, "/", component.activity}));
  }
  return result;
}

}  // namespace

std::vector<std::string> DefaultRankingForLocaleAndType(
    const std::string& locale,
    const std::string& type) {
  if (IsEnUsLocale(locale)) {
    if (IsImageType(type)) {
      return FlattenComponents(kEnUsImageRanking);
    }
    return FlattenComponents(kEnUsTextRanking);
  }
  if (IsImageType(type)) {
    return FlattenComponents(kWorldImageRanking);
  }
  return FlattenComponents(kWorldTextRanking);
}

}  // namespace sharing