package org.hl7.fhir.r4.model;

/*
  Copyright (c) 2011+, HL7, Inc.
  All rights reserved.
  
  Redistribution and use in source and binary forms, with or without modification, 
  are permitted provided that the following conditions are met:
    
   * Redistributions of source code must retain the above copyright notice, this 
     list of conditions and the following disclaimer.
   * 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.
   * Neither the name of HL7 nor the names of its contributors may be used to 
     endorse or promote products derived from this software without specific 
     prior written permission.
  
  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 HOLDER 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.
  
 */

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

import org.apache.commons.lang3.StringUtils;

import ca.uhn.fhir.model.api.annotation.DatatypeDef;

/**
 * Primitive type "uri" in FHIR: any valid URI. Sometimes constrained to be only
 * an absolute URI, and sometimes constrained to be a literal reference
 */
@DatatypeDef(name = "uri")
public class UriType extends PrimitiveType<String> {

  private static final long serialVersionUID = 3L;

  /**
   * Constructor
   */
  public UriType() {
    // nothing
  }

  /**
   * Constructor
   */
  public UriType(String theValue) {
    setValueAsString(theValue);
  }

  /**
   * Constructor
   */
  public UriType(URI theValue) {
    setValue(theValue.toString());
  }

  @Override
  public UriType copy() {
    UriType ret = new UriType(getValue());
    copyValues(ret);
    return ret;
  }

  @Override
  protected String encode(String theValue) {
    return theValue;
  }

  /**
   * Compares the given string to the string representation of this URI. In many
   * cases it is preferable to use this instead of the standard
   * {@link #equals(Object)} method, since that method returns <code>false</code>
   * unless it is passed an instance of {@link UriType}
   */
  public boolean equals(String theString) {
    return StringUtils.equals(getValueAsString(), theString);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;

    String normalize = normalize(getValue());
    result = prime * result + ((normalize == null) ? 0 : normalize.hashCode());

    return result;
  }

  private String normalize(String theValue) {
    if (theValue == null) {
      return null;
    }
    try {
      URI retVal = new URI(getValue()).normalize();
      String urlString = retVal.toString();
      if (urlString.endsWith("/") && urlString.length() > 1) {
        retVal = new URI(urlString.substring(0, urlString.length() - 1));
      }
      return retVal.toASCIIString();
    } catch (URISyntaxException e) {
      // ourLog.debug("Failed to normalize URL '{}', message was: {}", urlString,
      // e.toString());
      return theValue;
    }
  }

  @Override
  protected String parse(String theValue) {
    return theValue;
  }

  /**
   * Creates a new OidType instance which uses the given OID as the content (and
   * prepends "urn:oid:" to the OID string in the value of the newly created
   * OidType, per the FHIR specification).
   * 
   * @param theOid The OID to use (<code>null</code> is acceptable and will result
   *               in a UriDt instance with a <code>null</code> value)
   * @return A new UriDt instance
   */
  public static OidType fromOid(String theOid) {
    if (theOid == null) {
      return new OidType();
    }
    return new OidType("urn:oid:" + theOid);
  }

  @Override
  public boolean equalsDeep(Base obj) {
    if (!super.equalsDeep(obj))
      return false;
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;

    UriType other = (UriType) obj;
    if (getValue() == null && other.getValue() == null) {
      return true;
    }
    if (getValue() == null || other.getValue() == null) {
      return false;
    }
    if (getValue().equals(other.getValue())) {
      return true;
    }

    String normalize = normalize(getValue());
    String normalize2 = normalize(other.getValue());
    return normalize.equals(normalize2);
  }

  public String fhirType() {
    return "uri";
  }

}