/*
 * Copyright (C) 2011 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.util;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.net.Uri;
import android.provider.Contacts;
import android.provider.ContactsContract;
import android.provider.ContactsContract.RawContacts;

/** Utility methods for the {@link ContactLoader}. */
public final class ContactLoaderUtils {

  /** Static helper, not instantiable. */
  private ContactLoaderUtils() {}

  /**
   * Transforms the given Uri and returns a Lookup-Uri that represents the contact. For legacy
   * contacts, a raw-contact lookup is performed. An {@link IllegalArgumentException} can be thrown
   * if the URI is null or the authority is not recognized.
   *
   * <p>Do not call from the UI thread.
   */
  @SuppressWarnings("deprecation")
  public static Uri ensureIsContactUri(final ContentResolver resolver, final Uri uri)
      throws IllegalArgumentException {
    if (uri == null) {
      throw new IllegalArgumentException("uri must not be null");
    }

    final String authority = uri.getAuthority();

    // Current Style Uri?
    if (ContactsContract.AUTHORITY.equals(authority)) {
      final String type = resolver.getType(uri);
      // Contact-Uri? Good, return it
      if (ContactsContract.Contacts.CONTENT_ITEM_TYPE.equals(type)) {
        return uri;
      }

      // RawContact-Uri? Transform it to ContactUri
      if (RawContacts.CONTENT_ITEM_TYPE.equals(type)) {
        final long rawContactId = ContentUris.parseId(uri);
        return RawContacts.getContactLookupUri(
            resolver, ContentUris.withAppendedId(RawContacts.CONTENT_URI, rawContactId));
      }

      // Anything else? We don't know what this is
      throw new IllegalArgumentException("uri format is unknown");
    }

    // Legacy Style? Convert to RawContact
    final String OBSOLETE_AUTHORITY = Contacts.AUTHORITY;
    if (OBSOLETE_AUTHORITY.equals(authority)) {
      // Legacy Format. Convert to RawContact-Uri and then lookup the contact
      final long rawContactId = ContentUris.parseId(uri);
      return RawContacts.getContactLookupUri(
          resolver, ContentUris.withAppendedId(RawContacts.CONTENT_URI, rawContactId));
    }

    throw new IllegalArgumentException("uri authority is unknown");
  }
}