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package com.theoryinpractise.halbuilder.api;

import java.util.regex.Pattern;
import javax.annotation.Nullable;

/** A Link to an external resource. */
public class Link {
  /** Pattern that will hit an RFC 6570 URI template. */
  private static final Pattern URI_TEMPLATE_PATTERN = Pattern.compile("\\{.+\\}");

  private String href;

  private String rel;

  private String name;

  private String title;

  private String hreflang;

  private String profile;

  private boolean hasTemplate = false;

  public Link(String rel, String href) {
    this.href = href;
    this.rel = rel;
    this.name = "";
    this.title = "";
    this.hreflang = "";
    this.profile = "";
    if (hasTemplate(href)) {
      this.hasTemplate = true;
    }
  }

  public Link(String rel, String href, String name, String title, String hreflang, String profile) {
    this(rel, href);
    this.name = name;
    this.title = title;
    this.hreflang = hreflang;
    this.profile = profile;
  }

  /** @deprecated Use new Link(rel, href) */
  @Deprecated
  public Link(@Nullable RepresentationFactory representationFactory, String rel, String href) {
    this.href = href;
    this.rel = rel;
    this.name = "";
    this.title = "";
    this.hreflang = "";
    this.profile = "";
    if (hasTemplate(href)) {
      this.hasTemplate = true;
    }
  }

  /** @deprecated Use new Link(rel, href, name, title, hreflang, profile) */
  @Deprecated
  public Link(@Nullable RepresentationFactory representationFactory, String rel, String href, String name, String title, String hreflang, String profile) {
    this(rel, href);
    this.name = name;
    this.title = title;
    this.hreflang = hreflang;
    this.profile = profile;
  }

  public String getHref() {
    return href;
  }

  public String getRel() {
    return rel;
  }

  public String getName() {
    return name;
  }

  public String getTitle() {
    return title;
  }

  public String getHreflang() {
    return hreflang;
  }

  public String getProfile() {
    return profile;
  }

  public boolean hasTemplate() {
    return hasTemplate;
  }

  /**
   * Determine whether the argument href contains at least one URI template, as defined in RFC 6570.
   *
   * @param href Href to check.
   * @return True if the href contains a template, false if not (or if the argument is null).
   */
  private boolean hasTemplate(String href) {
    if (href == null) {
      return false;
    }
    return URI_TEMPLATE_PATTERN.matcher(href).find();
  }

  @Override
  public int hashCode() {
    int h = href.hashCode();
    h += rel.hashCode();
    if (name != null) {
      h += name.hashCode();
    }
    if (title != null) {
      h += title.hashCode();
    }
    if (profile != null) {
      h += profile.hashCode();
    }
    if (hreflang != null) {
      h += hreflang.hashCode();
    }
    return h;
  }

  @Override
  public boolean equals(Object obj) {
    if (obj == null) {
      return false;
    }
    if (obj == this) {
      return true;
    }
    if (!(obj instanceof Link)) {
      return false;
    }
    Link that = (Link) obj;
    boolean e = this.href.equals(that.href);
    e &= this.rel.equals(that.rel);
    if (!emptyOrNull(name)) {
      e &= this.name.equals(that.name);
    }
    if (!emptyOrNull(title)) {
      e &= this.title.equals(that.title);
    }
    if (!emptyOrNull(profile)) {
      e &= this.profile.equals(that.profile);
    }
    if (!emptyOrNull(hreflang)) {
      e &= this.hreflang.equals(that.hreflang);
    }
    return e;
  }

  @Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append("");

    return sb.toString();
  }

  private boolean emptyOrNull(String s) {
    return s == null || "".equals(s.trim());
  }
}