/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms.contacts;

import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.MergeCursor;
import android.net.Uri;
import android.os.Parcel;
import android.os.Parcelable;
import android.provider.ContactsContract;
import android.provider.ContactsContract.CommonDataKinds.Im;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.Contacts;
import android.provider.ContactsContract.Data;
import android.provider.ContactsContract.PhoneLookup;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.telephony.PhoneNumberUtils;
import android.util.Log;

import org.whispersystems.textsecure.crypto.IdentityKey;
import org.whispersystems.textsecure.crypto.InvalidKeyException;
import org.whispersystems.textsecure.directory.Directory;
import org.whispersystems.textsecure.util.Base64;

import java.io.IOException;
import java.lang.Long;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

/**
 * This class was originally a layer of indirection between
 * ContactAccessorNewApi and ContactAccesorOldApi, which corresponded
 * to the API changes between 1.x and 2.x.
 *
 * Now that we no longer support 1.x, this class mostly serves as a place
 * to encapsulate Contact-related logic.  It's still a singleton, mostly
 * just because that's how it's currently called from everywhere.
 *
 * @author Moxie Marlinspike
 */

public class ContactAccessor {

  public static final String PUSH_COLUMN = "push";

  private static final ContactAccessor instance = new ContactAccessor();

  public static synchronized ContactAccessor getInstance() {
    return instance;
  }

  public CursorLoader getCursorLoaderForContactsWithNumbers(Context context) {
    Uri uri          = ContactsContract.Contacts.CONTENT_URI;
    String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER + " = 1";

    return new CursorLoader(context, uri, null, selection, null,
                            ContactsContract.Contacts.DISPLAY_NAME + " ASC");
  }

  public CursorLoader getCursorLoaderForContactGroups(Context context) {
    return new CursorLoader(context, ContactsContract.Groups.CONTENT_URI,
                            null, null, null, ContactsContract.Groups.TITLE + " ASC");
  }

  public Loader<Cursor> getCursorLoaderForContacts(Context context) {
    return new ContactsCursorLoader(context);
  }

  public Cursor getCursorForContactsWithNumbers(Context context) {
    Uri uri = ContactsContract.Contacts.CONTENT_URI;
    String selection = ContactsContract.Contacts.HAS_PHONE_NUMBER + " = 1";

    return context.getContentResolver().query(uri, null, selection, null,
                                              ContactsContract.Contacts.DISPLAY_NAME + " ASC");
  }

  public Collection<ContactData> getContactsWithPush(Context context) {
    final ContentResolver resolver = context.getContentResolver();
    final String[] inProjection    = new String[]{PhoneLookup._ID, PhoneLookup.DISPLAY_NAME};

    List<String> pushNumbers = Directory.getInstance(context).getActiveNumbers();
    final Collection<ContactData> lookupData = new ArrayList<ContactData>(pushNumbers.size());

    for (String pushNumber : pushNumbers) {
      Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(pushNumber));
      Cursor lookupCursor = resolver.query(uri, inProjection, null, null, null);
      try {
        if (lookupCursor != null && lookupCursor.moveToFirst()) {
          final ContactData contactData = new ContactData(lookupCursor.getLong(0), lookupCursor.getString(1));
          contactData.numbers.add(new NumberData("TextSecure", pushNumber));
          lookupData.add(contactData);
        }
      } finally {
        if (lookupCursor != null)
          lookupCursor.close();
      }
    }
    return lookupData;
  }

  public String getNameFromContact(Context context, Uri uri) {
    Cursor cursor = null;

    try {
      cursor = context.getContentResolver().query(uri, new String[] {Contacts.DISPLAY_NAME},
                                                  null, null, null);

      if (cursor != null && cursor.moveToFirst())
        return cursor.getString(0);

    } finally {
      if (cursor != null)
        cursor.close();
    }

    return null;
  }

  public String getNameForNumber(Context context, String number) {
    Uri uri       = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(number));
    Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);

    try {
      if (cursor != null && cursor.moveToFirst())
        return cursor.getString(cursor.getColumnIndexOrThrow(PhoneLookup.DISPLAY_NAME));
    } finally {
      if (cursor != null)
        cursor.close();
    }

    return null;
  }

  public GroupData getGroupData(Context context, Cursor cursor) {
    long id      = cursor.getLong(cursor.getColumnIndexOrThrow(ContactsContract.Groups._ID));
    String title = cursor.getString(cursor.getColumnIndexOrThrow(ContactsContract.Groups.TITLE));

    return new GroupData(id, title);
  }

  public ContactData getContactData(Context context, Cursor cursor) {
    return getContactData(context,
                          cursor.getString(cursor.getColumnIndexOrThrow(Contacts.DISPLAY_NAME)),
                          cursor.getLong(cursor.getColumnIndexOrThrow(Contacts._ID)));
  }

  public ContactData getContactData(Context context, Uri uri) {
    return getContactData(context, getNameFromContact(context, uri),  Long.parseLong(uri.getLastPathSegment()));
  }

  private ContactData getContactData(Context context, String displayName, long id) {
    ContactData contactData = new ContactData(id, displayName);
    Cursor numberCursor     = null;

    try {
      numberCursor = context.getContentResolver().query(Phone.CONTENT_URI, null,
                                                        Phone.CONTACT_ID + " = ?",
                                                        new String[] {contactData.id + ""}, null);

      while (numberCursor != null && numberCursor.moveToNext()) {
        int type         = numberCursor.getInt(numberCursor.getColumnIndexOrThrow(Phone.TYPE));
        String label     = numberCursor.getString(numberCursor.getColumnIndexOrThrow(Phone.LABEL));
        String number    = numberCursor.getString(numberCursor.getColumnIndexOrThrow(Phone.NUMBER));
        String typeLabel = Phone.getTypeLabel(context.getResources(), type, label).toString();

        contactData.numbers.add(new NumberData(typeLabel, number));
      }
    } finally {
      if (numberCursor != null)
        numberCursor.close();
    }

    return contactData;
  }

  public List<ContactData> getGroupMembership(Context context, long groupId) {
    LinkedList<ContactData> contacts = new LinkedList<ContactData>();
    Cursor groupMembership           = null;

    try {
      String selection = ContactsContract.CommonDataKinds.GroupMembership.GROUP_ROW_ID + " = ? AND " +
                         ContactsContract.CommonDataKinds.GroupMembership.MIMETYPE + " = ?";
      String[] args    = new String[] {groupId+"",
                                       ContactsContract.CommonDataKinds.GroupMembership.CONTENT_ITEM_TYPE};

      groupMembership = context.getContentResolver().query(Data.CONTENT_URI, null, selection, args, null);

      while (groupMembership != null && groupMembership.moveToNext()) {
        String displayName = groupMembership.getString(groupMembership.getColumnIndexOrThrow(Data.DISPLAY_NAME));
        long contactId     = groupMembership.getLong(groupMembership.getColumnIndexOrThrow(Data.CONTACT_ID));

        contacts.add(getContactData(context, displayName, contactId));
      }
    } finally {
      if (groupMembership != null)
        groupMembership.close();
    }

    return contacts;
  }

  public List<String> getNumbersForThreadSearchFilter(String constraint, ContentResolver contentResolver) {
    LinkedList<String> numberList = new LinkedList<String>();
    Cursor cursor                 = null;

    try {
      cursor = contentResolver.query(Uri.withAppendedPath(Phone.CONTENT_FILTER_URI,
                                     Uri.encode(constraint)),
                                     null, null, null, null);

      while (cursor != null && cursor.moveToNext()) {
        numberList.add(cursor.getString(cursor.getColumnIndexOrThrow(Phone.NUMBER)));
      }

    } finally {
      if (cursor != null)
        cursor.close();
    }

    return numberList;
  }

  public CharSequence phoneTypeToString(Context mContext, int type, CharSequence label) {
    return Phone.getTypeLabel(mContext.getResources(), type, label);
  }

  public void insertIdentityKey(Context context, List<Long> rawContactIds, IdentityKey identityKey) {
    for (long rawContactId : rawContactIds) {
      Log.w("ContactAccessorNewApi", "Inserting data for raw contact id: " + rawContactId);
      ContentValues contentValues = new ContentValues();
      contentValues.put(Data.RAW_CONTACT_ID, rawContactId);
      contentValues.put(Data.MIMETYPE, Im.CONTENT_ITEM_TYPE);
      contentValues.put(Im.PROTOCOL, Im.PROTOCOL_CUSTOM);
      contentValues.put(Im.CUSTOM_PROTOCOL, "TextSecure-IdentityKey");
      contentValues.put(Im.DATA, Base64.encodeBytes(identityKey.serialize()));

      context.getContentResolver().insert(Data.CONTENT_URI, contentValues);
    }
  }

  public IdentityKey importIdentityKey(Context context, Uri uri) {
    long contactId         = getContactIdFromLookupUri(context, uri);
    String selection       = Im.CONTACT_ID + " = ? AND " + Im.PROTOCOL + " = ? AND " + Im.CUSTOM_PROTOCOL + " = ?";
    String[] selectionArgs = new String[] {contactId+"", Im.PROTOCOL_CUSTOM+"", "TextSecure-IdentityKey"};

    Cursor cursor          = context.getContentResolver().query(Data.CONTENT_URI, null, selection, selectionArgs, null);

    try {
      if (cursor != null && cursor.moveToFirst()) {
        String data = cursor.getString(cursor.getColumnIndexOrThrow(Im.DATA));

        if (data != null)
          return new IdentityKey(Base64.decode(data), 0);

      }
    } catch (InvalidKeyException e) {
      Log.w("ContactAccessorNewApi", e);
      return null;
    } catch (IOException e) {
      Log.w("ContactAccessorNewApi", e);
      return null;
    } finally {
      if (cursor != null)
        cursor.close();
    }

    return null;
  }

  private long getContactIdFromLookupUri(Context context, Uri uri) {
    Cursor cursor = null;

    try {
      cursor = context.getContentResolver().query(uri,
                                                  new String[] {ContactsContract.Contacts._ID},
                                                  null, null, null);

      if (cursor != null && cursor.moveToFirst()) {
        return cursor.getLong(0);
      } else {
        return -1;
      }

    } finally {
      if (cursor != null)
        cursor.close();
    }
  }

  public static class NumberData implements Parcelable {

    public static final Parcelable.Creator<NumberData> CREATOR = new Parcelable.Creator<NumberData>() {
      public NumberData createFromParcel(Parcel in) {
        return new NumberData(in);
      }

      public NumberData[] newArray(int size) {
        return new NumberData[size];
      }
    };

    public final String number;
    public final String type;

    public NumberData(String type, String number) {
      this.type = type;
      this.number = number;
    }

    public NumberData(Parcel in) {
      number = in.readString();
      type   = in.readString();
    }

    public int describeContents() {
      return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
      dest.writeString(number);
      dest.writeString(type);
    }
  }

  public static class GroupData {
    public final long id;
    public final String name;

    public GroupData(long id, String name) {
      this.id   = id;
      this.name = name;
    }
  }

  public static class ContactData implements Parcelable {

    public static final Parcelable.Creator<ContactData> CREATOR = new Parcelable.Creator<ContactData>() {
      public ContactData createFromParcel(Parcel in) {
        return new ContactData(in);
      }

      public ContactData[] newArray(int size) {
        return new ContactData[size];
      }
    };

    public final long id;
    public final String name;
    public final List<NumberData> numbers;

    public ContactData(long id, String name) {
      this.id      = id;
      this.name    = name;
      this.numbers = new LinkedList<NumberData>();
    }

    public ContactData(long id, String name, List<NumberData> numbers) {
      this.id      = id;
      this.name    = name;
      this.numbers = numbers;
    }


    public ContactData(Parcel in) {
      id      = in.readLong();
      name    = in.readString();
      numbers = new LinkedList<NumberData>();
      in.readTypedList(numbers, NumberData.CREATOR);
    }

    public int describeContents() {
      return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
      dest.writeLong(id);
      dest.writeString(name);
      dest.writeTypedList(numbers);
    }
  }

  /***
   * If the code below looks shitty to you, that's because it was taken
   * directly from the Android source, where shitty code is all you get.
   */

  public Cursor getCursorForRecipientFilter(CharSequence constraint,
      ContentResolver mContentResolver)
  {
    final String SORT_ORDER = Contacts.TIMES_CONTACTED + " DESC," +
                              Contacts.DISPLAY_NAME + "," + Phone.TYPE;

    final String[] PROJECTION_PHONE = {
        Phone._ID,                  // 0
        Phone.CONTACT_ID,           // 1
        Phone.TYPE,                 // 2
        Phone.NUMBER,               // 3
        Phone.LABEL,                // 4
        Phone.DISPLAY_NAME,         // 5
    };

    String phone = "";
    String cons  = null;

    if (constraint != null) {
      cons = constraint.toString();

      if (RecipientsAdapter.usefulAsDigits(cons)) {
        phone = PhoneNumberUtils.convertKeypadLettersToDigits(cons);
        if (phone.equals(cons) && !PhoneNumberUtils.isWellFormedSmsAddress(phone)) {
          phone = "";
        } else {
          phone = phone.trim();
        }
      }
    }
    Uri uri = Uri.withAppendedPath(Phone.CONTENT_FILTER_URI, Uri.encode(cons));
    String selection = String.format("%s=%s OR %s=%s OR %s=%s",
                                     Phone.TYPE,
                                     Phone.TYPE_MOBILE,
                                     Phone.TYPE,
                                     Phone.TYPE_WORK_MOBILE,
                                     Phone.TYPE,
                                     Phone.TYPE_MMS);

    Cursor phoneCursor = mContentResolver.query(uri,
                                                PROJECTION_PHONE,
                                                null,
                                                null,
                                                SORT_ORDER);

    if (phone.length() > 0) {
      ArrayList result = new ArrayList();
      result.add(Integer.valueOf(-1));                    // ID
      result.add(Long.valueOf(-1));                       // CONTACT_ID
      result.add(Integer.valueOf(Phone.TYPE_CUSTOM));     // TYPE
      result.add(phone);                                  // NUMBER

    /*
    * The "\u00A0" keeps Phone.getDisplayLabel() from deciding
    * to display the default label ("Home") next to the transformation
    * of the letters into numbers.
    */
      result.add("\u00A0");                               // LABEL
      result.add(cons);                                   // NAME

      ArrayList<ArrayList> wrap = new ArrayList<ArrayList>();
      wrap.add(result);

      ArrayListCursor translated = new ArrayListCursor(PROJECTION_PHONE, wrap);

      return new MergeCursor(new Cursor[] { translated, phoneCursor });
    } else {
      return phoneCursor;
    }
  }

}