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/**
 * Copyright (C) Posten Norge AS
 *
 * 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 no.digipost.api.client.representations;

import static no.digipost.api.client.representations.Relation.UNSUPPORTED;

import java.net.URI;
import java.net.URISyntaxException;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlTransient;
import javax.xml.bind.annotation.XmlType;

import org.apache.commons.lang3.builder.EqualsBuilder;
import org.apache.commons.lang3.builder.HashCodeBuilder;
import org.apache.commons.lang3.builder.ToStringBuilder;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "link", propOrder = { "rel", "uri", "mediaType" })
public class Link {
	private static final String RELATIONS_BASE_PATH = "/relations";

	@XmlTransient
	private Relation rel;
	@XmlTransient
	private String relationBaseUri;

	@XmlAttribute(required = true)
	private String uri;
	@XmlAttribute(name = "media-type")
	private String mediaType;

	public Link(final Relation relation, final DigipostUri uri, final String mediaType) {
		rel = relation;
		relationBaseUri = uri.getBaseUri() + RELATIONS_BASE_PATH;
		this.uri = uri.getUri().toString();
		this.mediaType = mediaType;
	}

	public Link(final Relation relation, final DigipostUri uri) {
		this(relation, uri, MediaTypes.DIGIPOST_MEDIA_TYPE_V6);
	}

	Link() {
	}

	private String parseRelationsBaseUri(final String rel) {
		return rel.substring(0, rel.lastIndexOf("/"));
	}

	private Relation parseRel(final String rel) {
		if (rel == null || rel.isEmpty()) return UNSUPPORTED;
		try {
			return Relation.valueOf(rel.substring(rel.lastIndexOf("/") + 1).toUpperCase());
		} catch (IllegalArgumentException e) {
			return UNSUPPORTED;
		}
	}

	public String getRelationUri() {
		return relationBaseUri + "/" + rel.name().toLowerCase();
	}

	@XmlAttribute
	public String getRel() {
		return getRelationUri();
	}

	public void setRel(final String rel) {
		this.rel = parseRel(rel);
		relationBaseUri = parseRelationsBaseUri(rel);
	}

	public Relation getRelationName() {
		return rel;
	}

	public URI getUri() {
		try {
			return new URI(uri);
		} catch (URISyntaxException e) {
			throw new RuntimeException(e);
		}
	}

	public String getMediaType() {
		return mediaType;
	}

	@Override
	public String toString() {
		return ToStringBuilder.reflectionToString(this);
	}

	public boolean equalsRelation(final Relation relation) {
		return rel.equals(relation);
	}

	@Override
	public int hashCode() {
		return new HashCodeBuilder(31, 1).append(mediaType).append(rel).append(relationBaseUri).append(uri).toHashCode();
	}

	@Override
	public boolean equals(final Object obj) {
		if (this == obj) {
			return true;
		}
		if (obj == null || getClass() != obj.getClass()) {
			return false;
		}
		Link other = (Link) obj;
		return new EqualsBuilder()
				.append(mediaType, other.mediaType)
				.append(rel, other.rel)
				.append(relationBaseUri, other.relationBaseUri)
				.append(uri, other.uri)
				.isEquals();
	}
}