/*
 * 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.browser;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.provider.BrowserContract;
import android.provider.BrowserContract.Accounts;
import android.provider.BrowserContract.Bookmarks;
import android.text.TextUtils;

public class AccountsChangedReceiver extends BroadcastReceiver {

    private static final String[] PROJECTION = new String[] {
        Accounts.ACCOUNT_NAME,
        Accounts.ACCOUNT_TYPE,
    };
    private static final String SELECTION = Accounts.ACCOUNT_NAME + " IS NOT NULL";
    private static final String DELETE_SELECTION = Accounts.ACCOUNT_NAME + "=? AND "
            + Accounts.ACCOUNT_TYPE + "=?";

    @Override
    public void onReceive(Context context, Intent intent) {
        new DeleteRemovedAccounts(context).start();
    }

    static class DeleteRemovedAccounts extends Thread {
        Context mContext;
        public DeleteRemovedAccounts(Context context) {
            mContext = context.getApplicationContext();
        }

        @Override
        public void run() {
            Account[] accounts = AccountManager.get(mContext).getAccounts();
            ContentResolver cr = mContext.getContentResolver();
            Cursor c = cr.query(Accounts.CONTENT_URI, PROJECTION,
                    SELECTION, null, null);
            while (c.moveToNext()) {
                String name = c.getString(0);
                String type = c.getString(1);
                if (!contains(accounts, name, type)) {
                    delete(cr, name, type);
                }
            }
            cr.update(Accounts.CONTENT_URI, null, null, null);
            c.close();
        }

        void delete(ContentResolver cr, String name, String type) {
            // Pretend to be a sync adapter to delete the data and not mark
            // it for deletion. Without this, the bookmarks will be marked to
            // be deleted, which will propagate to the server if the account
            // is added back.
            Uri uri = Bookmarks.CONTENT_URI.buildUpon()
                    .appendQueryParameter(BrowserContract.CALLER_IS_SYNCADAPTER, "true")
                    .build();
            cr.delete(uri, DELETE_SELECTION, new String[] { name, type });
        }

        boolean contains(Account[] accounts, String name, String type) {
            for (Account a : accounts) {
                if (TextUtils.equals(a.name, name)
                        && TextUtils.equals(a.type, type)) {
                    return true;
                }
            }
            return false;
        }
    }
}