/*
 * Copyright (C) 2009 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.contacts.common.model.account;

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.provider.ContactsContract.CommonDataKinds.Photo;
import android.provider.ContactsContract.CommonDataKinds.StructuredName;
import android.support.annotation.VisibleForTesting;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.Log;
import android.util.Xml;
import com.android.contacts.common.R;
import com.android.contacts.common.model.dataitem.DataKind;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

/** A general contacts account type descriptor. */
public class ExternalAccountType extends BaseAccountType {

  private static final String TAG = "ExternalAccountType";

  private static final String SYNC_META_DATA = "android.content.SyncAdapter";

  /**
   * The metadata name for so-called "contacts.xml".
   *
   * <p>On LMP and later, we also accept the "alternate" name. This is to allow sync adapters to
   * have a contacts.xml without making it visible on older platforms. If you modify this also
   * update the corresponding list in ContactsProvider/PhotoPriorityResolver
   */
  private static final String[] METADATA_CONTACTS_NAMES =
      new String[] {
        "android.provider.ALTERNATE_CONTACTS_STRUCTURE", "android.provider.CONTACTS_STRUCTURE"
      };

  private static final String TAG_CONTACTS_SOURCE_LEGACY = "ContactsSource";
  private static final String TAG_CONTACTS_ACCOUNT_TYPE = "ContactsAccountType";
  private static final String TAG_CONTACTS_DATA_KIND = "ContactsDataKind";
  private static final String TAG_EDIT_SCHEMA = "EditSchema";

  private static final String ATTR_EDIT_CONTACT_ACTIVITY = "editContactActivity";
  private static final String ATTR_CREATE_CONTACT_ACTIVITY = "createContactActivity";
  private static final String ATTR_INVITE_CONTACT_ACTIVITY = "inviteContactActivity";
  private static final String ATTR_INVITE_CONTACT_ACTION_LABEL = "inviteContactActionLabel";
  private static final String ATTR_VIEW_CONTACT_NOTIFY_SERVICE = "viewContactNotifyService";
  private static final String ATTR_VIEW_GROUP_ACTIVITY = "viewGroupActivity";
  private static final String ATTR_VIEW_GROUP_ACTION_LABEL = "viewGroupActionLabel";
  private static final String ATTR_DATA_SET = "dataSet";
  private static final String ATTR_EXTENSION_PACKAGE_NAMES = "extensionPackageNames";

  // The following attributes should only be set in non-sync-adapter account types.  They allow
  // for the account type and resource IDs to be specified without an associated authenticator.
  private static final String ATTR_ACCOUNT_TYPE = "accountType";
  private static final String ATTR_ACCOUNT_LABEL = "accountTypeLabel";
  private static final String ATTR_ACCOUNT_ICON = "accountTypeIcon";

  private final boolean mIsExtension;

  private String mEditContactActivityClassName;
  private String mCreateContactActivityClassName;
  private String mInviteContactActivity;
  private String mInviteActionLabelAttribute;
  private int mInviteActionLabelResId;
  private String mViewContactNotifyService;
  private String mViewGroupActivity;
  private String mViewGroupLabelAttribute;
  private int mViewGroupLabelResId;
  private List<String> mExtensionPackageNames;
  private String mAccountTypeLabelAttribute;
  private String mAccountTypeIconAttribute;
  private boolean mHasContactsMetadata;
  private boolean mHasEditSchema;

  public ExternalAccountType(Context context, String resPackageName, boolean isExtension) {
    this(context, resPackageName, isExtension, null);
  }

  /**
   * Constructor used for testing to initialize with any arbitrary XML.
   *
   * @param injectedMetadata If non-null, it'll be used to initialize the type. Only set by tests.
   *     If null, the metadata is loaded from the specified package.
   */
  ExternalAccountType(
      Context context,
      String packageName,
      boolean isExtension,
      XmlResourceParser injectedMetadata) {
    this.mIsExtension = isExtension;
    this.resourcePackageName = packageName;
    this.syncAdapterPackageName = packageName;

    final XmlResourceParser parser;
    if (injectedMetadata == null) {
      parser = loadContactsXml(context, packageName);
    } else {
      parser = injectedMetadata;
    }
    boolean needLineNumberInErrorLog = true;
    try {
      if (parser != null) {
        inflate(context, parser);
      }

      // Done parsing; line number no longer needed in error log.
      needLineNumberInErrorLog = false;
      if (mHasEditSchema) {
        checkKindExists(StructuredName.CONTENT_ITEM_TYPE);
        checkKindExists(DataKind.PSEUDO_MIME_TYPE_DISPLAY_NAME);
        checkKindExists(DataKind.PSEUDO_MIME_TYPE_PHONETIC_NAME);
        checkKindExists(Photo.CONTENT_ITEM_TYPE);
      } else {
        // Bring in name and photo from fallback source, which are non-optional
        addDataKindStructuredName(context);
        addDataKindDisplayName(context);
        addDataKindPhoneticName(context);
        addDataKindPhoto(context);
      }
    } catch (DefinitionException e) {
      final StringBuilder error = new StringBuilder();
      error.append("Problem reading XML");
      if (needLineNumberInErrorLog && (parser != null)) {
        error.append(" in line ");
        error.append(parser.getLineNumber());
      }
      error.append(" for external package ");
      error.append(packageName);

      Log.e(TAG, error.toString(), e);
      return;
    } finally {
      if (parser != null) {
        parser.close();
      }
    }

    mExtensionPackageNames = new ArrayList<String>();
    mInviteActionLabelResId =
        resolveExternalResId(
            context,
            mInviteActionLabelAttribute,
            syncAdapterPackageName,
            ATTR_INVITE_CONTACT_ACTION_LABEL);
    mViewGroupLabelResId =
        resolveExternalResId(
            context,
            mViewGroupLabelAttribute,
            syncAdapterPackageName,
            ATTR_VIEW_GROUP_ACTION_LABEL);
    titleRes =
        resolveExternalResId(
            context, mAccountTypeLabelAttribute, syncAdapterPackageName, ATTR_ACCOUNT_LABEL);
    iconRes =
        resolveExternalResId(
            context, mAccountTypeIconAttribute, syncAdapterPackageName, ATTR_ACCOUNT_ICON);

    // If we reach this point, the account type has been successfully initialized.
    mIsInitialized = true;
  }

  /**
   * Returns the CONTACTS_STRUCTURE metadata (aka "contacts.xml") in the given apk package.
   *
   * <p>This method looks through all services in the package that handle sync adapter intents for
   * the first one that contains CONTACTS_STRUCTURE metadata. We have to look through all sync
   * adapters in the package in case there are contacts and other sync adapters (eg, calendar) in
   * the same package.
   *
   * <p>Returns {@code null} if the package has no CONTACTS_STRUCTURE metadata. In this case the
   * account type *will* be initialized with minimal configuration.
   */
  public static XmlResourceParser loadContactsXml(Context context, String resPackageName) {
    final PackageManager pm = context.getPackageManager();
    final Intent intent = new Intent(SYNC_META_DATA).setPackage(resPackageName);
    final List<ResolveInfo> intentServices =
        pm.queryIntentServices(intent, PackageManager.GET_SERVICES | PackageManager.GET_META_DATA);

    if (intentServices != null) {
      for (final ResolveInfo resolveInfo : intentServices) {
        final ServiceInfo serviceInfo = resolveInfo.serviceInfo;
        if (serviceInfo == null) {
          continue;
        }
        for (String metadataName : METADATA_CONTACTS_NAMES) {
          final XmlResourceParser parser = serviceInfo.loadXmlMetaData(pm, metadataName);
          if (parser != null) {
            if (Log.isLoggable(TAG, Log.DEBUG)) {
              Log.d(
                  TAG,
                  String.format(
                      "Metadata loaded from: %s, %s, %s",
                      serviceInfo.packageName, serviceInfo.name, metadataName));
            }
            return parser;
          }
        }
      }
    }

    // Package was found, but that doesn't contain the CONTACTS_STRUCTURE metadata.
    return null;
  }

  /** Returns {@code TRUE} if the package contains CONTACTS_STRUCTURE metadata. */
  public static boolean hasContactsXml(Context context, String resPackageName) {
    return loadContactsXml(context, resPackageName) != null;
  }

  /**
   * Takes a string in the "@xxx/yyy" format and return the resource ID for the resource in the
   * resource package.
   *
   * <p>If the argument is in the invalid format or isn't a resource name, it returns -1.
   *
   * @param context context
   * @param resourceName Resource name in the "@xxx/yyy" format, e.g. "@string/invite_lavbel"
   * @param packageName name of the package containing the resource.
   * @param xmlAttributeName attribute name which the resource came from. Used for logging.
   */
  @VisibleForTesting
  static int resolveExternalResId(
      Context context, String resourceName, String packageName, String xmlAttributeName) {
    if (TextUtils.isEmpty(resourceName)) {
      return -1; // Empty text is okay.
    }
    if (resourceName.charAt(0) != '@') {
      Log.e(TAG, xmlAttributeName + " must be a resource name beginnig with '@'");
      return -1;
    }
    final String name = resourceName.substring(1);
    final Resources res;
    try {
      res = context.getPackageManager().getResourcesForApplication(packageName);
    } catch (NameNotFoundException e) {
      Log.e(TAG, "Unable to load package " + packageName);
      return -1;
    }
    final int resId = res.getIdentifier(name, null, packageName);
    if (resId == 0) {
      Log.e(TAG, "Unable to load " + resourceName + " from package " + packageName);
      return -1;
    }
    return resId;
  }

  private void checkKindExists(String mimeType) throws DefinitionException {
    if (getKindForMimetype(mimeType) == null) {
      throw new DefinitionException(mimeType + " must be supported");
    }
  }

  @Override
  public boolean isEmbedded() {
    return false;
  }

  @Override
  public boolean isExtension() {
    return mIsExtension;
  }

  @Override
  public boolean areContactsWritable() {
    return mHasEditSchema;
  }

  /** Whether this account type has the android.provider.CONTACTS_STRUCTURE metadata xml. */
  public boolean hasContactsMetadata() {
    return mHasContactsMetadata;
  }

  @Override
  public String getEditContactActivityClassName() {
    return mEditContactActivityClassName;
  }

  @Override
  public String getCreateContactActivityClassName() {
    return mCreateContactActivityClassName;
  }

  @Override
  public String getInviteContactActivityClassName() {
    return mInviteContactActivity;
  }

  @Override
  protected int getInviteContactActionResId() {
    return mInviteActionLabelResId;
  }

  @Override
  public String getViewContactNotifyServiceClassName() {
    return mViewContactNotifyService;
  }

  @Override
  public String getViewGroupActivity() {
    return mViewGroupActivity;
  }

  @Override
  protected int getViewGroupLabelResId() {
    return mViewGroupLabelResId;
  }

  @Override
  public List<String> getExtensionPackageNames() {
    return mExtensionPackageNames;
  }

  /**
   * Inflate this {@link AccountType} from the given parser. This may only load details matching the
   * publicly-defined schema.
   */
  protected void inflate(Context context, XmlPullParser parser) throws DefinitionException {
    final AttributeSet attrs = Xml.asAttributeSet(parser);

    try {
      int type;
      while ((type = parser.next()) != XmlPullParser.START_TAG
          && type != XmlPullParser.END_DOCUMENT) {
        // Drain comments and whitespace
      }

      if (type != XmlPullParser.START_TAG) {
        throw new IllegalStateException("No start tag found");
      }

      String rootTag = parser.getName();
      if (!TAG_CONTACTS_ACCOUNT_TYPE.equals(rootTag)
          && !TAG_CONTACTS_SOURCE_LEGACY.equals(rootTag)) {
        throw new IllegalStateException(
            "Top level element must be " + TAG_CONTACTS_ACCOUNT_TYPE + ", not " + rootTag);
      }

      mHasContactsMetadata = true;

      int attributeCount = parser.getAttributeCount();
      for (int i = 0; i < attributeCount; i++) {
        String attr = parser.getAttributeName(i);
        String value = parser.getAttributeValue(i);
        if (Log.isLoggable(TAG, Log.DEBUG)) {
          Log.d(TAG, attr + "=" + value);
        }
        if (ATTR_EDIT_CONTACT_ACTIVITY.equals(attr)) {
          mEditContactActivityClassName = value;
        } else if (ATTR_CREATE_CONTACT_ACTIVITY.equals(attr)) {
          mCreateContactActivityClassName = value;
        } else if (ATTR_INVITE_CONTACT_ACTIVITY.equals(attr)) {
          mInviteContactActivity = value;
        } else if (ATTR_INVITE_CONTACT_ACTION_LABEL.equals(attr)) {
          mInviteActionLabelAttribute = value;
        } else if (ATTR_VIEW_CONTACT_NOTIFY_SERVICE.equals(attr)) {
          mViewContactNotifyService = value;
        } else if (ATTR_VIEW_GROUP_ACTIVITY.equals(attr)) {
          mViewGroupActivity = value;
        } else if (ATTR_VIEW_GROUP_ACTION_LABEL.equals(attr)) {
          mViewGroupLabelAttribute = value;
        } else if (ATTR_DATA_SET.equals(attr)) {
          dataSet = value;
        } else if (ATTR_EXTENSION_PACKAGE_NAMES.equals(attr)) {
          mExtensionPackageNames.add(value);
        } else if (ATTR_ACCOUNT_TYPE.equals(attr)) {
          accountType = value;
        } else if (ATTR_ACCOUNT_LABEL.equals(attr)) {
          mAccountTypeLabelAttribute = value;
        } else if (ATTR_ACCOUNT_ICON.equals(attr)) {
          mAccountTypeIconAttribute = value;
        } else {
          Log.e(TAG, "Unsupported attribute " + attr);
        }
      }

      // Parse all children kinds
      final int startDepth = parser.getDepth();
      while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > startDepth)
          && type != XmlPullParser.END_DOCUMENT) {

        if (type != XmlPullParser.START_TAG || parser.getDepth() != startDepth + 1) {
          continue; // Not a direct child tag
        }

        String tag = parser.getName();
        if (TAG_EDIT_SCHEMA.equals(tag)) {
          mHasEditSchema = true;
          parseEditSchema(context, parser, attrs);
        } else if (TAG_CONTACTS_DATA_KIND.equals(tag)) {
          final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ContactsDataKind);
          final DataKind kind = new DataKind();

          kind.mimeType = a.getString(R.styleable.ContactsDataKind_android_mimeType);
          final String summaryColumn =
              a.getString(R.styleable.ContactsDataKind_android_summaryColumn);
          if (summaryColumn != null) {
            // Inflate a specific column as summary when requested
            kind.actionHeader = new SimpleInflater(summaryColumn);
          }
          final String detailColumn =
              a.getString(R.styleable.ContactsDataKind_android_detailColumn);
          if (detailColumn != null) {
            // Inflate specific column as summary
            kind.actionBody = new SimpleInflater(detailColumn);
          }

          a.recycle();

          addKind(kind);
        }
      }
    } catch (XmlPullParserException e) {
      throw new DefinitionException("Problem reading XML", e);
    } catch (IOException e) {
      throw new DefinitionException("Problem reading XML", e);
    }
  }
}