/*
    * Copyright (C) 2020-2023 Dipl.-Inform. Kai Hofmann. All rights reserved!
    */
   package de.powerstat.validation.values;
   
   
   import java.util.Objects;
   
   import de.powerstat.validation.interfaces.IValueObject;
  
  
  /**
   * Hours.
   *
   * Not DSGVO relevant.
   *
   * TODO min, max
   */
  public final class Hours implements Comparable<Hours>, IValueObject
   {
    /* *
     * Cache for singletons.
     */
    // private static final Map<Long, Hours> CACHE = new WeakHashMap<>();
  
    /**
     * Hours.
     */
    private final long hours;
  
  
    /**
     * Constructor.
     *
     * @param hours Hours 0-..
     * @throws IndexOutOfBoundsException When the hours is less than 0
     */
    private Hours(final long hours)
     {
      super();
      if (hours < 0)
       {
        throw new IndexOutOfBoundsException("Negative hours are not allowed"); //$NON-NLS-1$
       }
      this.hours = hours;
     }
  
  
    /**
     * Hours factory.
     *
     * @param hours Hours 0-..
     * @return Hours object
     */
    public static Hours of(final long hours)
     {
      /*
      synchronized (Hours.class)
       {
        Hours obj = Hours.CACHE.get(hours);
        if (obj != null)
         {
          return obj;
         }
        obj = new Hours(hours);
        Hours.CACHE.put(Long.valueOf(hours), obj);
        return obj;
       }
      */
      return new Hours(hours);
     }
  
  
    /**
     * Hours factory.
     *
     * @param value Hours 0-.. string
     * @return Hours object
     */
    public static Hours of(final String value)
     {
      return of(Long.parseLong(value));
     }
  
  
    /**
     * Returns the value of this BFPONumber as a long.
     *
     * @return The numeric value represented by this object after conversion to type long.
     */
    public long longValue()
     {
      return this.hours;
     }
  
  
    /**
     * Returns the value of this BFPONumber as a String.
     *
    * @return The numeric value represented by this object after conversion to type String.
    */
   @Override
   public String stringValue()
    {
     return String.valueOf(this.hours);
    }
 
 
   /**
    * Calculate hash code.
    *
    * @return Hash
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode()
    {
     return Long.hashCode(this.hours);
    }
 
 
   /**
    * Is equal with another object.
    *
    * @param obj Object
    * @return true when equal, false otherwise
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals(final Object obj)
    {
     if (this == obj)
      {
       return true;
      }
     if (!(obj instanceof Hours))
      {
       return false;
      }
     final Hours other = (Hours)obj;
     return this.hours == other.hours;
    }
 
 
   /**
    * Returns the string representation of this Hours.
    *
    * The exact details of this representation are unspecified and subject to change, but the following may be regarded as typical:
    *
    * "Hours[hours=1]"
    *
    * @return String representation of this Hours
    * @see java.lang.Object#toString()
    */
   @Override
   public String toString()
    {
     final var builder = new StringBuilder();
     builder.append("Hours[hours=").append(this.hours).append(']'); //$NON-NLS-1$
     return builder.toString();
    }
 
 
   /**
    * Compare with another object.
    *
    * @param obj Object to compare with
    * @return 0: equal; 1: greater; -1: smaller
    * @see java.lang.Comparable#compareTo(java.lang.Object)
    */
   @Override
   public int compareTo(final Hours obj)
    {
     Objects.requireNonNull(obj, "obj"); //$NON-NLS-1$
     return Long.compare(this.hours, obj.hours);
    }
 
 
   /**
    * Add other hours to this hours.
    *
    * @param other Other hours to add to this hours
    * @return New hours after adding other hours to this hours
    * @throws ArithmeticException In case of an overflow
    */
   public Hours add(final Hours other)
    {
     return Hours.of(Math.addExact(this.hours, other.hours));
    }
 
 
   /**
    * Subtract other hours from this hours.
    *
    * @param other Other hours to subtract from this one
    * @return Absolute new hours after subtracting other hours from this hours
    */
   public Hours subtract(final Hours other)
    {
     if (other.hours > this.hours)
      {
       return Hours.of(other.hours - this.hours);
      }
     return Hours.of(this.hours - other.hours);
    }
 
 
   /**
    * Multiply hours with a multiplier.
    *
    * @param multiplier Multiplier to multiply with
    * @return New hours that is a multiplication of this hours with the multiplier
    * @throws ArithmeticException In case of an overflow
    */
   public Hours multiply(final long multiplier)
    {
     return Hours.of(Math.multiplyExact(this.hours, multiplier));
    }
 
 
   /**
    * Divide hours by a divisor.
    *
    * @param divisor Divisor to divide by
    * @return The largest (closest to positive infinity) long value that is less than or equal to the algebraic quotient.
    * @throws ArithmeticException In case the divisor is 0.
    */
   public Hours divide(final long divisor)
    {
     return Hours.of(Math.floorDiv(this.hours, divisor));
    }
 
 
   /**
    * Floor modulo hours by a divisor.
    *
    * @param divisor Divisor to divide by
    * @return The floor modulus Hours - (floorDiv(Hours, divisor) * divisor)
    * @throws ArithmeticException In case the divisor is 0.
    */
   public Hours modulo(final long divisor)
    {
     return Hours.of(Math.floorMod(this.hours, divisor));
    }
 
  }