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.math.BigDecimal;
import java.math.MathContext;
import java.math.RoundingMode;

import org.apache.commons.lang3.StringUtils;
import org.hl7.fhir.instance.model.api.IBaseDecimalDatatype;

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

/**
 * Primitive type "decimal" in FHIR: A rational number
 */
@DatatypeDef(name = "decimal")
public class DecimalType extends PrimitiveType<BigDecimal> implements Comparable<DecimalType>, IBaseDecimalDatatype {

  private static final long serialVersionUID = 3L;

  /**
   * Constructor
   */
  public DecimalType() {
    super();
  }

  /**
   * Constructor
   */
  public DecimalType(BigDecimal theValue) {
    setValue(theValue);
  }

  /**
   * Constructor
   */
  public DecimalType(double theValue) {
    // Use the valueOf here because the constructor gives wacky precision
    // changes due to the floating point conversion
    setValue(BigDecimal.valueOf(theValue));
  }

  /**
   * Constructor
   */
  public DecimalType(long theValue) {
    setValue(theValue);
  }

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

  @Override
  public int compareTo(DecimalType theObj) {
    if (getValue() == null && theObj.getValue() == null) {
      return 0;
    }
    if (getValue() != null && theObj.getValue() == null) {
      return 1;
    }
    if (getValue() == null && theObj.getValue() != null) {
      return -1;
    }
    return getValue().compareTo(theObj.getValue());
  }

  @Override
  protected String encode(BigDecimal theValue) {
    return getValue().toString();
  }

  /**
   * Gets the value as an integer, using {@link BigDecimal#intValue()}
   */
  public int getValueAsInteger() {
    return getValue().intValue();
  }

  public Number getValueAsNumber() {
    return getValue();
  }

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

  /**
   * Rounds the value to the given prevision
   * 
   * @see MathContext#getPrecision()
   */
  public void round(int thePrecision) {
    if (getValue() != null) {
      BigDecimal newValue = getValue().round(new MathContext(thePrecision));
      setValue(newValue);
    }
  }

  /**
   * Rounds the value to the given prevision
   * 
   * @see MathContext#getPrecision()
   * @see MathContext#getRoundingMode()
   */
  public void round(int thePrecision, RoundingMode theRoundingMode) {
    if (getValue() != null) {
      BigDecimal newValue = getValue().round(new MathContext(thePrecision, theRoundingMode));
      setValue(newValue);
    }
  }

  /**
   * Sets a new value using an integer
   */
  public void setValueAsInteger(int theValue) {
    setValue(BigDecimal.valueOf(theValue));
  }

  public void setValueAsString(String theString) {
    if (StringUtils.isBlank(theString)) {
      setValue((BigDecimal) null);
      setRepresentation(null);
    } else {
      setValue(new BigDecimal(theString));
      setRepresentation(theString);
    }
  }

  /**
   * Sets a new value using a long
   */
  public void setValue(long theValue) {
    setValue(BigDecimal.valueOf(theValue));
  }

  /**
   * Sets a new value using a double
   */
  public void setValue(double theValue) {
    setValue(BigDecimal.valueOf(theValue));
  }

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

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

  /**
   * A parser can provide a literal representation for the decimal value that
   * preserves the presented form.
   * 
   * All sorts of bad things can happen if this method is used to set the string
   * representation to anything other than what was parsed into the actual value.
   * Don't do that
   * 
   * @param value
   * @return
   */
  public DecimalType setRepresentation(String value) {
    forceStringValue(value);
    return this;
  }
}