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/*
 * TeleStax, Open Source Cloud Communications
 * Copyright 2011-2014, Telestax Inc and individual contributors
 * by the @authors tag.
 *
 * This program is free software: you can redistribute it and/or modify
 * under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see 
 *
 */
package org.restcomm.connect.dao.mybatis;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.joda.time.DateTime;
import org.restcomm.connect.commons.annotations.concurrency.ThreadSafe;
import org.restcomm.connect.dao.AccountsDao;
import org.restcomm.connect.dao.entities.Account;
import org.restcomm.connect.commons.dao.Sid;

import java.net.URI;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import static org.restcomm.connect.dao.DaoUtils.readAccountStatus;
import static org.restcomm.connect.dao.DaoUtils.readAccountType;
import static org.restcomm.connect.dao.DaoUtils.readDateTime;
import static org.restcomm.connect.dao.DaoUtils.readSid;
import static org.restcomm.connect.dao.DaoUtils.readString;
import static org.restcomm.connect.dao.DaoUtils.readUri;
import static org.restcomm.connect.dao.DaoUtils.writeAccountStatus;
import static org.restcomm.connect.dao.DaoUtils.writeAccountType;
import static org.restcomm.connect.dao.DaoUtils.writeDateTime;
import static org.restcomm.connect.dao.DaoUtils.writeSid;
import static org.restcomm.connect.dao.DaoUtils.writeUri;

/**
 * @author [email protected] (Thomas Quintana)
 */
@ThreadSafe
public final class MybatisAccountsDao implements AccountsDao {
    private static final String namespace = "org.mobicents.servlet.sip.restcomm.dao.AccountsDao.";
    private Integer accountRecursionDepth = 4; // maximum value for recursive account queries
    private final SqlSessionFactory sessions;

    public MybatisAccountsDao(final SqlSessionFactory sessions) {
        super();
        this.sessions = sessions;
    }

    public void setAccountRecursionDepth(Integer accountRecursionDepth) {
        this.accountRecursionDepth = accountRecursionDepth;
    }

    @Override
    public void addAccount(final Account account) {
        final SqlSession session = sessions.openSession();
        try {
            session.insert(namespace + "addAccount", toMap(account));
            session.commit();
        } finally {
            session.close();
        }
    }

    @Override
    public Account getAccount(final Sid sid) {
        return getAccount(namespace + "getAccount", sid.toString());
    }

    @Override
    public Account getAccount(final String name) {
        Account account = null;

        account = getAccount(namespace + "getAccountByFriendlyName", name);
        if (account == null) {
            account = getAccount(namespace + "getAccountByEmail", name);
        }
        if (account == null) {
            account = getAccount(namespace + "getAccount", name);
        }

        return account;
    }

    @Override
    public Account getAccountToAuthenticate(final String name) {
        Account account = null;

        account = getAccount(namespace + "getAccountByEmail", name);
        if (account == null) {
            account = getAccount(namespace + "getAccount", name);
        }

        return account;
    }

    private Account getAccount(final String selector, final Object parameters) {
        final SqlSession session = sessions.openSession();
        try {
            final Map result = session.selectOne(selector, parameters);
            if (result != null) {
                return toAccount(result);
            } else {
                return null;
            }
        } finally {
            session.close();
        }
    }

    @Override
    public List getChildAccounts(final Sid parentSid) {
        final SqlSession session = sessions.openSession();
        try {
            final List> results = session.selectList(namespace + "getChildAccounts", parentSid.toString());
            final List accounts = new ArrayList();
            if (results != null && !results.isEmpty()) {
                for (final Map result : results) {
                    accounts.add(toAccount(result));
                }
            }
            return accounts;
        } finally {
            session.close();
        }
    }

    @Override
    public void removeAccount(final Sid sid) {
        removeAccount(namespace + "removeAccount", sid);
    }

    private void removeAccount(final String selector, final Sid sid) {
        final SqlSession session = sessions.openSession();
        try {
            session.delete(selector, sid.toString());
            session.commit();
        } finally {
            session.close();
        }
    }

    @Override
    public void updateAccount(final Account account) {
        updateAccount(namespace + "updateAccount", account);
    }

    @Override
    public List getSubAccountSidsRecursive(Sid parentAccountSid) {
        List parentList = new ArrayList();
        parentList.add(parentAccountSid.toString());
        List allChildren = new ArrayList();

        int depth = 1;
        List childrenList = getSubAccountsSids(parentList);
        while (childrenList != null && !childrenList.isEmpty() && depth < accountRecursionDepth) {
            allChildren.addAll(childrenList);
            childrenList = getSubAccountsSids(childrenList); // retrieve children's children

            depth ++;
        }

        return allChildren;
    }

    private List getSubAccountsSids(List parentAccountSidList) {
        final SqlSession session = sessions.openSession();
        try {
            final List results = session.selectList(namespace + "getSubAccountSids", parentAccountSidList);
            return results;
        } finally {
            session.close();
        }
    }

    private void updateAccount(final String selector, final Account account) {
        final SqlSession session = sessions.openSession();
        try {
            session.update(selector, toMap(account));
            session.commit();
        } finally {
            session.close();
        }
    }

    private Account toAccount(final Map map) {
        final Sid sid = readSid(map.get("sid"));
        final DateTime dateCreated = readDateTime(map.get("date_created"));
        final DateTime dateUpdated = readDateTime(map.get("date_updated"));
        final String emailAddress = readString(map.get("email_address"));
        final String friendlyName = readString(map.get("friendly_name"));
        final Sid parentSid = readSid(map.get("parent_sid"));
        final Account.Type type = readAccountType(map.get("type"));
        final Account.Status status = readAccountStatus(map.get("status"));
        final String authToken = readString(map.get("auth_token"));
        final String role = readString(map.get("role"));
        final URI uri = readUri(map.get("uri"));
        return new Account(sid, dateCreated, dateUpdated, emailAddress, friendlyName, parentSid, type, status, authToken,
                role, uri);
    }

    private Map toMap(final Account account) {
        final Map map = new HashMap();
        map.put("sid", writeSid(account.getSid()));
        map.put("date_created", writeDateTime(account.getDateCreated()));
        map.put("date_updated", writeDateTime(account.getDateUpdated()));
        map.put("email_address", account.getEmailAddress());
        map.put("friendly_name", account.getFriendlyName());
        map.put("parent_sid", writeSid(account.getParentSid()));
        map.put("type", writeAccountType(account.getType()));
        map.put("status", writeAccountStatus(account.getStatus()));
        map.put("auth_token", account.getAuthToken());
        map.put("role", account.getRole());
        map.put("uri", writeUri(account.getUri()));
        return map;
    }
}