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/****************************************************************
 * Licensed to the Apache Software Foundation (ASF) under one   *
 * or more contributor license agreements.  See the NOTICE file *
 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF licenses this file   *
 * to you 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 org.apache.james.user.jpa.model;

import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.Version;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.james.user.api.model.User;

@Entity(name = "JamesUser")
@Table(name = "JAMES_USER")
@NamedQueries({ @NamedQuery(name = "findUserByName", query = "SELECT user FROM JamesUser user WHERE user.name=:name"), @NamedQuery(name = "deleteUserByName", query = "DELETE FROM JamesUser user WHERE user.name=:name"),
        @NamedQuery(name = "containsUser", query = "SELECT COUNT(user) FROM JamesUser user WHERE user.name=:name"), @NamedQuery(name = "countUsers", query = "SELECT COUNT(user) FROM JamesUser user"), @NamedQuery(name = "listUserNames", query = "SELECT user.name FROM JamesUser user") })
public class JPAUser implements User {

    /**
     * Hash password.
     * 
     * @param username
     *            not null
     * @param password
     *            not null
     * @return not null
     */
    private static String hashPassword(String username, String password, String alg) {
        String newPass;
        if (alg == null || alg.equals("MD5")) {
            newPass = DigestUtils.md5Hex(password);
        } else if (alg.equals("NONE")) {
            newPass = "password";
        } else if (alg.equals("SHA-256")) {
            newPass = DigestUtils.sha256Hex(password);
        } else if (alg.equals("SHA-512")) {
            newPass = DigestUtils.sha512Hex(password);
        } else {
            newPass = DigestUtils.shaHex(password);
        }
        return newPass;
    }

    /** Prevents concurrent modification */
    @SuppressWarnings("unused")
    @Version
    private int version;

    /** Key by user name */
    @Id
    @Column(name = "USER_NAME", nullable = false, length = 100)
    private String name;

    /** Hashed password */
    @Basic
    @Column(name = "PASSWORD", nullable = false, length = 100)
    private String password;

    @Basic
    @Column(name = "PASSWORD_HASH_ALGORITHM", nullable = false, length = 100)
    private String alg;

    protected JPAUser() {
    }

    public JPAUser(final String userName, String password, String alg) {
        super();
        this.name = userName;
        this.alg = alg;
        this.password = hashPassword(userName, password, alg);
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.james.api.user.User#getUserName()
     */
    public String getUserName() {
        return name;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.james.api.user.User#setPassword(java.lang.String)
     */
    public boolean setPassword(String newPass) {
        final boolean result;
        if (newPass == null) {
            result = false;
        } else {
            password = hashPassword(name, newPass, alg);
            result = true;
        }
        return result;
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.apache.james.api.user.User#verifyPassword(java.lang.String)
     */
    public boolean verifyPassword(String pass) {
        final boolean result;
        if (pass == null) {
            result = password == null;
        } else if (password == null) {
            result = false;
        } else {
            result = password.equals(hashPassword(name, pass, alg));
        }
        return result;
    }

    @Override
    public int hashCode() {
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + ((name == null) ? 0 : name.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final JPAUser other = (JPAUser) obj;
        if (name == null) {
            if (other.name != null)
                return false;
        } else if (!name.equals(other.name))
            return false;
        return true;
    }

    @Override
    public String toString() {
        return "[User " + name + "]";
    }

}