/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.incallui;

import android.Manifest.permission;
import android.content.Context;
import android.content.Loader;
import android.content.Loader.OnLoadCompleteListener;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v4.content.ContextCompat;
import android.telecom.PhoneAccount;
import android.telecom.TelecomManager;
import android.text.TextUtils;
import com.android.contacts.common.model.Contact;
import com.android.contacts.common.model.ContactLoader;
import com.android.dialer.common.LogUtil;
import com.android.dialer.phonenumbercache.CachedNumberLookupService;
import com.android.dialer.phonenumbercache.CachedNumberLookupService.CachedContactInfo;
import com.android.dialer.phonenumbercache.ContactInfo;
import com.android.dialer.phonenumberutil.PhoneNumberHelper;
import com.android.dialer.telecom.TelecomUtil;
import com.android.dialer.util.PermissionsUtil;
import com.android.incallui.call.DialerCall;
import java.util.Arrays;

/** Utility methods for contact and caller info related functionality */
public class CallerInfoUtils {

  private static final String TAG = CallerInfoUtils.class.getSimpleName();

  private static final int QUERY_TOKEN = -1;

  public CallerInfoUtils() {}

  /**
   * This is called to get caller info for a call. This will return a CallerInfo object immediately
   * based off information in the call, but more information is returned to the
   * OnQueryCompleteListener (which contains information about the phone number label, user's name,
   * etc).
   */
  static CallerInfo getCallerInfoForCall(
      Context context,
      DialerCall call,
      Object cookie,
      CallerInfoAsyncQuery.OnQueryCompleteListener listener) {
    CallerInfo info = buildCallerInfo(context, call);

    // TODO: Have phoneapp send a Uri when it knows the contact that triggered this call.

    if (info.numberPresentation == TelecomManager.PRESENTATION_ALLOWED) {
      if (PermissionsUtil.hasContactsReadPermissions(context)) {
        // Start the query with the number provided from the call.
        LogUtil.d(
            "CallerInfoUtils.getCallerInfoForCall",
            "Actually starting CallerInfoAsyncQuery.startQuery()...");

        //noinspection MissingPermission
        CallerInfoAsyncQuery.startQuery(QUERY_TOKEN, context, info, listener, cookie);
      } else {
        LogUtil.w(
            "CallerInfoUtils.getCallerInfoForCall",
            "Dialer doesn't have permission to read contacts."
                + " Not calling CallerInfoAsyncQuery.startQuery().");
      }
    }
    return info;
  }

  static CallerInfo buildCallerInfo(Context context, DialerCall call) {
    CallerInfo info = new CallerInfo();

    // Store CNAP information retrieved from the Connection (we want to do this
    // here regardless of whether the number is empty or not).
    info.cnapName = call.getCnapName();
    info.name = info.cnapName;
    info.numberPresentation = call.getNumberPresentation();
    info.namePresentation = call.getCnapNamePresentation();
    info.callSubject = call.getCallSubject();
    info.contactExists = false;

    String number = call.getNumber();
    if (!TextUtils.isEmpty(number)) {
      // Don't split it if it's a SIP number.
      if (!PhoneNumberHelper.isUriNumber(number)) {
        final String[] numbers = number.split("&");
        number = numbers[0];
        if (numbers.length > 1) {
          info.forwardingNumber = numbers[1];
        }
        number = modifyForSpecialCnapCases(context, info, number, info.numberPresentation);
      }
      info.phoneNumber = number;
    }

    // Because the InCallUI is immediately launched before the call is connected, occasionally
    // a voicemail call will be passed to InCallUI as a "voicemail:" URI without a number.
    // This call should still be handled as a voicemail call.
    if (isVoiceMailNumber(context, call)) {
      info.markAsVoiceMail(context);
    }

    ContactInfoCache.getInstance(context).maybeInsertCnapInformationIntoCache(context, call, info);

    return info;
  }

  /**
   * Creates a new {@link CachedContactInfo} from a {@link CallerInfo}
   *
   * @param lookupService the {@link CachedNumberLookupService} used to build a new {@link
   *     CachedContactInfo}
   * @param {@link CallerInfo} object
   * @return a CachedContactInfo object created from this CallerInfo
   * @throws NullPointerException if lookupService or ci are null
   */
  public static CachedContactInfo buildCachedContactInfo(
      CachedNumberLookupService lookupService, CallerInfo ci) {
    ContactInfo info = new ContactInfo();
    info.name = ci.name;
    info.type = ci.numberType;
    info.label = ci.phoneLabel;
    info.number = ci.phoneNumber;
    info.normalizedNumber = ci.normalizedNumber;
    info.photoUri = ci.contactDisplayPhotoUri;
    info.userType = ci.userType;

    CachedContactInfo cacheInfo = lookupService.buildCachedContactInfo(info);
    cacheInfo.setLookupKey(ci.lookupKeyOrNull);
    return cacheInfo;
  }

  public static boolean isVoiceMailNumber(Context context, @NonNull DialerCall call) {
    if (call.getHandle() != null
        && PhoneAccount.SCHEME_VOICEMAIL.equals(call.getHandle().getScheme())) {
      return true;
    }

    if (ContextCompat.checkSelfPermission(context, permission.READ_PHONE_STATE)
        != PackageManager.PERMISSION_GRANTED) {
      return false;
    }

    return TelecomUtil.isVoicemailNumber(context, call.getAccountHandle(), call.getNumber());
  }

  /**
   * Handles certain "corner cases" for CNAP. When we receive weird phone numbers from the network
   * to indicate different number presentations, convert them to expected number and presentation
   * values within the CallerInfo object.
   *
   * @param number number we use to verify if we are in a corner case
   * @param presentation presentation value used to verify if we are in a corner case
   * @return the new String that should be used for the phone number
   */
  /* package */
  static String modifyForSpecialCnapCases(
      Context context, CallerInfo ci, String number, int presentation) {
    // Obviously we return number if ci == null, but still return number if
    // number == null, because in these cases the correct string will still be
    // displayed/logged after this function returns based on the presentation value.
    if (ci == null || number == null) {
      return number;
    }

    LogUtil.d(
        "CallerInfoUtils.modifyForSpecialCnapCases",
        "modifyForSpecialCnapCases: initially, number="
            + toLogSafePhoneNumber(number)
            + ", presentation="
            + presentation
            + " ci "
            + ci);

    // "ABSENT NUMBER" is a possible value we could get from the network as the
    // phone number, so if this happens, change it to "Unknown" in the CallerInfo
    // and fix the presentation to be the same.
    final String[] absentNumberValues = context.getResources().getStringArray(R.array.absent_num);
    if (Arrays.asList(absentNumberValues).contains(number)
        && presentation == TelecomManager.PRESENTATION_ALLOWED) {
      number = context.getString(R.string.unknown);
      ci.numberPresentation = TelecomManager.PRESENTATION_UNKNOWN;
    }

    // Check for other special "corner cases" for CNAP and fix them similarly. Corner
    // cases only apply if we received an allowed presentation from the network, so check
    // if we think we have an allowed presentation, or if the CallerInfo presentation doesn't
    // match the presentation passed in for verification (meaning we changed it previously
    // because it's a corner case and we're being called from a different entry point).
    if (ci.numberPresentation == TelecomManager.PRESENTATION_ALLOWED
        || (ci.numberPresentation != presentation
            && presentation == TelecomManager.PRESENTATION_ALLOWED)) {
      // For all special strings, change number & numberPrentation.
      if (isCnapSpecialCaseRestricted(number)) {
        number = PhoneNumberHelper.getDisplayNameForRestrictedNumber(context).toString();
        ci.numberPresentation = TelecomManager.PRESENTATION_RESTRICTED;
      } else if (isCnapSpecialCaseUnknown(number)) {
        number = context.getString(R.string.unknown);
        ci.numberPresentation = TelecomManager.PRESENTATION_UNKNOWN;
      }
      LogUtil.d(
          "CallerInfoUtils.modifyForSpecialCnapCases",
          "SpecialCnap: number="
              + toLogSafePhoneNumber(number)
              + "; presentation now="
              + ci.numberPresentation);
    }
    LogUtil.d(
        "CallerInfoUtils.modifyForSpecialCnapCases",
        "returning number string=" + toLogSafePhoneNumber(number));
    return number;
  }

  private static boolean isCnapSpecialCaseRestricted(String n) {
    return n.equals("PRIVATE") || n.equals("P") || n.equals("RES") || n.equals("PRIVATENUMBER");
  }

  private static boolean isCnapSpecialCaseUnknown(String n) {
    return n.equals("UNAVAILABLE") || n.equals("UNKNOWN") || n.equals("UNA") || n.equals("U");
  }

  /* package */
  static String toLogSafePhoneNumber(String number) {
    // For unknown number, log empty string.
    if (number == null) {
      return "";
    }

    // Todo: Figure out an equivalent for VDBG
    if (false) {
      // When VDBG is true we emit PII.
      return number;
    }

    // Do exactly same thing as Uri#toSafeString() does, which will enable us to compare
    // sanitized phone numbers.
    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < number.length(); i++) {
      char c = number.charAt(i);
      if (c == '-' || c == '@' || c == '.' || c == '&') {
        builder.append(c);
      } else {
        builder.append('x');
      }
    }
    return builder.toString();
  }

  /**
   * Send a notification using a {@link ContactLoader} to inform the sync adapter that we are
   * viewing a particular contact, so that it can download the high-res photo.
   */
  public static void sendViewNotification(Context context, Uri contactUri) {
    final ContactLoader loader =
        new ContactLoader(context, contactUri, true /* postViewNotification */);
    loader.registerListener(
        0,
        new OnLoadCompleteListener<Contact>() {
          @Override
          public void onLoadComplete(Loader<Contact> loader, Contact contact) {
            try {
              loader.reset();
            } catch (RuntimeException e) {
              LogUtil.e("CallerInfoUtils.onLoadComplete", "Error resetting loader", e);
            }
          }
        });
    loader.startLoading();
  }
}