/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.mail;

import java.io.Serializable;
import java.util.Date;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

/**
 * Models a simple mail message, including data such as the from, to, cc, subject,
 * and text fields.
 *
 * <p>Consider {@code JavaMailSender} and JavaMail {@code MimeMessages} for creating
 * more sophisticated messages, for example messages with attachments, special
 * character encodings, or personal names that accompany mail addresses.
 *
 * @author Dmitriy Kopylenko
 * @author Juergen Hoeller
 * @since 10.09.2003
 * @see MailSender
 * @see org.springframework.mail.javamail.JavaMailSender
 * @see org.springframework.mail.javamail.MimeMessagePreparator
 * @see org.springframework.mail.javamail.MimeMessageHelper
 * @see org.springframework.mail.javamail.MimeMailMessage
 */
@SuppressWarnings("serial")
public class SimpleMailMessage implements MailMessage, Serializable {

        @Nullable
        private String from;

        @Nullable
        private String replyTo;

        @Nullable
        private String[] to;

        @Nullable
        private String[] cc;

        @Nullable
        private String[] bcc;

        @Nullable
        private Date sentDate;

        @Nullable
        private String subject;

        @Nullable
        private String text;


        /**
         * Create a new {@code SimpleMailMessage}.
         */
        public SimpleMailMessage() {
        }

        /**
         * Copy constructor for creating a new {@code SimpleMailMessage} from the state
         * of an existing {@code SimpleMailMessage} instance.
         */
        public SimpleMailMessage(SimpleMailMessage original) {
                Assert.notNull(original, "'original' message argument must not be null");
                this.from = original.getFrom();
                this.replyTo = original.getReplyTo();
                this.to = copyOrNull(original.getTo());
                this.cc = copyOrNull(original.getCc());
                this.bcc = copyOrNull(original.getBcc());
                this.sentDate = original.getSentDate();
                this.subject = original.getSubject();
                this.text = original.getText();
        }


        @Override
        public void setFrom(String from) {
                this.from = from;
        }

        @Nullable
        public String getFrom() {
                return this.from;
        }

        @Override
        public void setReplyTo(String replyTo) {
                this.replyTo = replyTo;
        }

        @Nullable
        public String getReplyTo() {
                return this.replyTo;
        }

        @Override
        public void setTo(String to) {
                this.to = new String[] {to};
        }

        @Override
        public void setTo(String... to) {
                this.to = to;
        }

        @Nullable
        public String[] getTo() {
                return this.to;
        }

        @Override
        public void setCc(String cc) {
                this.cc = new String[] {cc};
        }

        @Override
        public void setCc(String... cc) {
                this.cc = cc;
        }

        @Nullable
        public String[] getCc() {
                return this.cc;
        }

        @Override
        public void setBcc(String bcc) {
                this.bcc = new String[] {bcc};
        }

        @Override
        public void setBcc(String... bcc) {
                this.bcc = bcc;
        }

        @Nullable
        public String[] getBcc() {
                return this.bcc;
        }

        @Override
        public void setSentDate(Date sentDate) {
                this.sentDate = sentDate;
        }

        @Nullable
        public Date getSentDate() {
                return this.sentDate;
        }

        @Override
        public void setSubject(String subject) {
                this.subject = subject;
        }

        @Nullable
        public String getSubject() {
                return this.subject;
        }

        @Override
        public void setText(String text) {
                this.text = text;
        }

        @Nullable
        public String getText() {
                return this.text;
        }


        /**
         * Copy the contents of this message to the given target message.
         * @param target the {@code MailMessage} to copy to
         */
        public void copyTo(MailMessage target) {
                Assert.notNull(target, "'target' MailMessage must not be null");
                if (getFrom() != null) {
                        target.setFrom(getFrom());
                }
                if (getReplyTo() != null) {
                        target.setReplyTo(getReplyTo());
                }
                if (getTo() != null) {
                        target.setTo(copy(getTo()));
                }
                if (getCc() != null) {
                        target.setCc(copy(getCc()));
                }
                if (getBcc() != null) {
                        target.setBcc(copy(getBcc()));
                }
                if (getSentDate() != null) {
                        target.setSentDate(getSentDate());
                }
                if (getSubject() != null) {
                        target.setSubject(getSubject());
                }
                if (getText() != null) {
                        target.setText(getText());
                }
        }


        @Override
        public boolean equals(@Nullable Object other) {
                if (this == other) {
                        return true;
                }
                if (!(other instanceof SimpleMailMessage)) {
                        return false;
                }
                SimpleMailMessage otherMessage = (SimpleMailMessage) other;
                return (ObjectUtils.nullSafeEquals(this.from, otherMessage.from) &&
                                ObjectUtils.nullSafeEquals(this.replyTo, otherMessage.replyTo) &&
                                ObjectUtils.nullSafeEquals(this.to, otherMessage.to) &&
                                ObjectUtils.nullSafeEquals(this.cc, otherMessage.cc) &&
                                ObjectUtils.nullSafeEquals(this.bcc, otherMessage.bcc) &&
                                ObjectUtils.nullSafeEquals(this.sentDate, otherMessage.sentDate) &&
                                ObjectUtils.nullSafeEquals(this.subject, otherMessage.subject) &&
                                ObjectUtils.nullSafeEquals(this.text, otherMessage.text));
        }

        @Override
        public int hashCode() {
                int hashCode = ObjectUtils.nullSafeHashCode(this.from);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.replyTo);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.to);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.cc);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.bcc);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.sentDate);
                hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.subject);
                return hashCode;
        }

        @Override
        public String toString() {
                StringBuilder sb = new StringBuilder("SimpleMailMessage: ");
                sb.append("from=").append(this.from).append("; ");
                sb.append("replyTo=").append(this.replyTo).append("; ");
                sb.append("to=").append(StringUtils.arrayToCommaDelimitedString(this.to)).append("; ");
                sb.append("cc=").append(StringUtils.arrayToCommaDelimitedString(this.cc)).append("; ");
                sb.append("bcc=").append(StringUtils.arrayToCommaDelimitedString(this.bcc)).append("; ");
                sb.append("sentDate=").append(this.sentDate).append("; ");
                sb.append("subject=").append(this.subject).append("; ");
                sb.append("text=").append(this.text);
                return sb.toString();
        }


        @Nullable
        private static String[] copyOrNull(@Nullable String[] state) {
                if (state == null) {
                        return null;
                }
                return copy(state);
        }

        private static String[] copy(String[] state) {
                return state.clone();
        }

}