package ezvcard.property;

import java.time.DateTimeException;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import ezvcard.VCard;
import ezvcard.VCardVersion;
import ezvcard.ValidationWarning;
import ezvcard.parameter.Pid;

/*
 Copyright (c) 2012-2026, Michael Angstadt
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met: 

 1. Redistributions of source code must retain the above copyright notice, this
 list of conditions and the following disclaimer. 
 2. Redistributions in binary form must reproduce the above copyright notice,
 this list of conditions and the following disclaimer in the documentation
 and/or other materials provided with the distribution. 

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 The views and conclusions contained in the software and documentation are those
 of the authors and should not be interpreted as representing official policies, 
 either expressed or implied, of the FreeBSD Project.
 */

/**
 * <p>
 * Defines the timezone that the person lives/works in.
 * </p>
 * 
 * <p>
 * <b>Code sample</b>
 * </p>
 * 
 * <pre class="brush:java">
 * VCard vcard = new VCard();
 * 
 * Timezone tz = new Timezone(ZoneOffset.ofHours(-5), "America/New_York");
 * vcard.addTimezone(tz);
 * 
 * //using a Java "ZoneId" object
 * ZoneId zoneId = ZoneId.of("America/New_York");
 * tz = new Timezone(zoneId);
 * vcard.addTimezone(tz);
 * </pre>
 * 
 * <p>
 * <b>Property name:</b> {@code TZ}
 * </p>
 * <p>
 * <b>Supported versions:</b> {@code 2.1, 3.0, 4.0}
 * </p>
 * 
 * @author Michael Angstadt
 * @see <a href="http://tools.ietf.org/html/rfc6350#page-22">RFC 6350 p.22</a>
 * @see <a href="http://tools.ietf.org/html/rfc2426#page-16">RFC 2426 p.16</a>
 * @see <a href="http://www.imc.org/pdi/vcard-21.doc">vCard 2.1 p.16</a>
 */
public class Timezone extends VCardProperty implements HasAltId {
        private ZoneOffset offset;
        private String text;

        /**
         * Creates a timezone property.
         * @param text a free-form string representing the timezone, preferably a
         * timezone ID from the <a
         * href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones">Olson
         * Database</a> (e.g. "America/New_York")
         */
        public Timezone(String text) {
                this(null, text);
        }

        /**
         * Creates a timezone property.
         * @param offset the UTC offset
         */
        public Timezone(ZoneOffset offset) {
                this(offset, null);
        }

        /**
         * Creates a timezone property.
         * @param offset the UTC offset
         * @param text a free-form string representing the timezone, preferably a
         * timezone ID from the <a
         * href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones">Olson
         * Database</a> (e.g. "America/New_York")
         */
        public Timezone(ZoneOffset offset, String text) {
                setOffset(offset);
                setText(text);
        }

        /**
         * Creates a timezone property.
         * @param timezone the timezone
         */
        public Timezone(ZoneId timezone) {
                this(OffsetDateTime.now(timezone).getOffset(), timezone.getId());
        }

        /**
         * Copy constructor.
         * @param original the property to make a copy of
         */
        public Timezone(Timezone original) {
                super(original);
                offset = original.offset;
                text = original.text;
        }

        /**
         * Gets the UTC offset.
         * @return the UTC offset or null if not set
         */
        public ZoneOffset getOffset() {
                return offset;
        }

        /**
         * Sets the UTC offset.
         * @param offset the UTC offset
         */
        public void setOffset(ZoneOffset offset) {
                this.offset = offset;
        }

        /**
         * Gets the text portion of the timezone.
         * @return the free-form string representing the timezone, such as a
         * timezone ID from the <a
         * href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones">Olson
         * Database</a> (e.g. "America/New_York")
         */
        public String getText() {
                return text;
        }

        /**
         * Sets the text portion of the timezone.
         * @param text a free-form string representing the timezone, preferably a
         * timezone ID from the <a
         * href="http://en.wikipedia.org/wiki/List_of_tz_database_time_zones">Olson
         * Database</a> (e.g. "America/New_York")
         */
        public void setText(String text) {
                this.text = text;
        }

        /**
         * Creates a {@link ZoneId} representation of this class.
         * @return a {@link ZoneId} object or null if this object contains no
         * offset data
         */
        public ZoneId toTimeZone() {
                if (text != null) {
                        try {
                                return ZoneId.of(text);
                        } catch (DateTimeException ignore) {
                                //not a recognized timezone
                        }
                }

                if (offset != null) {
                        return offset;
                }

                return null;
        }

        /**
         * Gets the TYPE parameter.
         * <p>
         * <b>Supported versions:</b> {@code 4.0}
         * </p>
         * @return the TYPE value (typically, this will be either "work" or "home")
         * or null if it doesn't exist
         */
        public String getType() {
                return parameters.getType();
        }

        /**
         * Sets the TYPE parameter.
         * <p>
         * <b>Supported versions:</b> {@code 4.0}
         * </p>
         * @param type the TYPE value (this should be either "work" or "home") or
         * null to remove
         */
        public void setType(String type) {
                parameters.setType(type);
        }

        /**
         * Gets the MEDIATYPE parameter.
         * <p>
         * <b>Supported versions:</b> {@code 4.0}
         * </p>
         * @return the media type or null if not set
         */
        public String getMediaType() {
                return parameters.getMediaType();
        }

        /**
         * Sets the MEDIATYPE parameter.
         * <p>
         * <b>Supported versions:</b> {@code 4.0}
         * </p>
         * @param mediaType the media type or null to remove
         */
        public void setMediaType(String mediaType) {
                parameters.setMediaType(mediaType);
        }

        @Override
        public List<Pid> getPids() {
                return super.getPids();
        }

        @Override
        public Integer getPref() {
                return super.getPref();
        }

        @Override
        public void setPref(Integer pref) {
                super.setPref(pref);
        }

        //@Override
        public String getAltId() {
                return parameters.getAltId();
        }

        //@Override
        public void setAltId(String altId) {
                parameters.setAltId(altId);
        }

        @Override
        protected void _validate(List<ValidationWarning> warnings, VCardVersion version, VCard vcard) {
                if (offset == null && text == null) {
                        warnings.add(new ValidationWarning(8));
                }
                if (offset == null && version == VCardVersion.V2_1) {
                        warnings.add(new ValidationWarning(20));
                }
        }

        @Override
        protected Map<String, Object> toStringValues() {
                Map<String, Object> values = new LinkedHashMap<>();
                values.put("offset", offset);
                values.put("text", text);
                return values;
        }

        @Override
        public Timezone copy() {
                return new Timezone(this);
        }

        @Override
        public int hashCode() {
                final int prime = 31;
                int result = super.hashCode();
                result = prime * result + Objects.hash(offset, text);
                return result;
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj) return true;
                if (!super.equals(obj)) return false;
                if (getClass() != obj.getClass()) return false;
                Timezone other = (Timezone) obj;
                return Objects.equals(offset, other.offset) && Objects.equals(text, other.text);
        }
}