package eu.alefzero.owncloud.syncadapter;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

import android.accounts.Account;
import android.content.ContentProviderClient;
import android.content.Context;
import android.content.SyncResult;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.util.Log;

public class ContactSyncAdapter extends AbstractOwnCloudSyncAdapter {

	private static final String TAG = "ContactSyncAdapter";

	public ContactSyncAdapter(Context context, boolean autoInitialize) {
		super(context, autoInitialize);
	}

	@Override
	public synchronized void onPerformSync(
			Account account, 
			Bundle extras, 
			String authority, 
			ContentProviderClient provider, 
			SyncResult syncResult) {
		
		this.setAccount(account);
		this.setContentProvider(provider);

		// TODO find all contacts on ownCloud that not synced or the sync date is behind than the last sync date
		Cursor cursor = getContacts();
		if (cursor != null && cursor.getCount() > 0) {
			while (cursor.moveToNext()) {
				String id = cursor.getString(
						cursor.getColumnIndex(ContactsContract.Contacts._ID));
				String lookup = cursor.getString(
						cursor.getColumnIndex(ContactsContract.Contacts.LOOKUP_KEY));
				Log.d(TAG, "Found Contact id: " + id + " with lookupkey: "+lookup);
				
				try {
					FileInputStream fis = getContactVcard(lookup);
					// TODO make a webdav request based on the stream
					// TODO send request to the ownCloud server
					// TODO mark the current contact as synced - where to store?
					fis.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}

	}
	
	/**
	 * Returns the vCard based on the LookupKey for Contact as Stream 
	 * 
	 * @param lookupKey
	 * @return
	 * @throws IOException
	 */
	private FileInputStream getContactVcard(String lookupKey) throws IOException {
		Uri uri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_VCARD_URI, lookupKey);
		AssetFileDescriptor fd = getContext().getContentResolver().openAssetFileDescriptor(uri, "r");
		return fd.createInputStream();
	}

	/**
	 * Obtains the contact list.
	 *
	 * @return A cursor for for accessing the contact list.
	 */
	private Cursor getContacts()
	{
		// Run query
		Uri uri = ContactsContract.Contacts.CONTENT_URI;
		String[] projection = new String[] {
				ContactsContract.Contacts._ID,
				ContactsContract.Contacts.LOOKUP_KEY
		};

		boolean showInvisible = false;
		String selection = ContactsContract.Contacts.IN_VISIBLE_GROUP + " = '" + 
				(showInvisible ? "0" : "1") + "'";
		String[] selectionArgs = null;
		String sortOrder = ContactsContract.Contacts._ID + " DESC";

		return getContext().getContentResolver().query(uri, projection, selection, selectionArgs, sortOrder);
	}

}