/*
 * Copyright (C) 2012 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.mail.utils;

import com.android.mail.providers.Account;
import com.android.mail.providers.MailAppProvider;
import com.android.mail.providers.UIProvider;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import com.google.common.collect.Lists;

import java.util.ArrayList;
import java.util.List;

public class AccountUtils {
    /**
     * Merge two lists of accounts into one list of accounts without duplicates.
     *
     * @param inList List of accounts.
     * @param accounts Accounts to merge in.
     * @param prioritizeAccountList Boolean indicating whether this method
     *            should prioritize the list of Account objects when merging the
     *            lists
     * @return Merged list of accounts.
     */
    public static List<Account> mergeAccountLists(List<Account> inList, Account[] accounts,
            boolean prioritizeAccountList) {

        List<Account> newAccountList = new ArrayList<Account>();
        List<String> existingList = new ArrayList<String>();
        if (inList != null) {
            for (Account account : inList) {
                existingList.add(account.getEmailAddress());
            }
        }
        // Make sure the accounts are actually synchronized
        // (we won't be able to save/send for accounts that
        // have never been synchronized)
        for (int i = 0; i < accounts.length; i++) {
            final String accountName = accounts[i].getEmailAddress();
            // If the account is in the cached list or the caller requested
            // that we prioritize the list of Account objects, put it in the new list
            if (prioritizeAccountList || existingList.contains(accountName)) {
                newAccountList.add(accounts[i]);
            }
        }
        return newAccountList;
    }

    /**
     * Synchronous method which returns registered accounts that are syncing.
     * @param context
     * @return
     */
    public static Account[] getSyncingAccounts(Context context) {
        final ContentResolver resolver = context.getContentResolver();
        Cursor accountsCursor = null;
        final List<Account> accounts = Lists.newArrayList();
        Account account;
        try {
            accountsCursor = resolver.query(MailAppProvider.getAccountsUri(),
                    UIProvider.ACCOUNTS_PROJECTION, null, null, null);
            if (accountsCursor != null) {
                while (accountsCursor.moveToNext()) {
                    account = Account.builder().buildFrom(accountsCursor);
                    if (!account.isAccountSyncRequired()) {
                        accounts.add(account);
                    }
                }
            }
        } finally {
            if (accountsCursor != null) {
                accountsCursor.close();
            }
        }
        return accounts.toArray(new Account[accounts.size()]);
    }

    /**
     * Synchronous method which returns registered accounts.
     * @param context
     * @return
     */
    public static Account[] getAccounts(Context context) {
        final ContentResolver resolver = context.getContentResolver();
        Cursor accountsCursor = null;
        final List<Account> accounts = Lists.newArrayList();
        try {
            accountsCursor = resolver.query(MailAppProvider.getAccountsUri(),
                    UIProvider.ACCOUNTS_PROJECTION, null, null, null);
            if (accountsCursor != null) {
                while (accountsCursor.moveToNext()) {
                    accounts.add(Account.builder().buildFrom(accountsCursor));
                }
            }
        } finally {
            if (accountsCursor != null) {
                accountsCursor.close();
            }
        }
        return accounts.toArray(new Account[accounts.size()]);
    }
}