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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.commons.lang3.math;

/**
 * Provides IEEE-754r variants of NumberUtils methods. 
 *
 * See: http://en.wikipedia.org/wiki/IEEE_754r
 *
 * @since 2.4
 * @version $Id: IEEE754rUtils.java 1436768 2013-01-22 07:07:42Z ggregory $
 */
public class IEEE754rUtils {
    
     /**
     * Returns the minimum value in an array.
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if array is null
     * @throws IllegalArgumentException if array is empty
     */
    public static double min(final double[] array) {
        // Validates input
        if (array == null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }
    
        // Finds and returns min
        double min = array[0];
        for (int i = 1; i < array.length; i++) {
            min = min(array[i], min);
        }
    
        return min;
    }

    /**
     * Returns the minimum value in an array.
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if array is null
     * @throws IllegalArgumentException if array is empty
     */
    public static float min(final float[] array) {
        // Validates input
        if (array == null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }
    
        // Finds and returns min
        float min = array[0];
        for (int i = 1; i < array.length; i++) {
            min = min(array[i], min);
        }
    
        return min;
    }

    /**
     * Gets the minimum of three double values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     * 
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the smallest of the values
     */
    public static double min(final double a, final double b, final double c) {
        return min(min(a, b), c);
    }

    /**
     * Gets the minimum of two double values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     * 
     * @param a  value 1
     * @param b  value 2
     * @return  the smallest of the values
     */
    public static double min(final double a, final double b) {
        if(Double.isNaN(a)) {
            return b;
        } else
        if(Double.isNaN(b)) {
            return a;
        } else {
            return Math.min(a, b);
        }
    }

    /**
     * Gets the minimum of three float values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the smallest of the values
     */
    public static float min(final float a, final float b, final float c) {
        return min(min(a, b), c);
    }

    /**
     * Gets the minimum of two float values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @return  the smallest of the values
     */
    public static float min(final float a, final float b) {
        if(Float.isNaN(a)) {
            return b;
        } else
        if(Float.isNaN(b)) {
            return a;
        } else {
            return Math.min(a, b);
        }
    }

    /**
     * Returns the maximum value in an array.
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if array is null
     * @throws IllegalArgumentException if array is empty
     */
    public static double max(final double[] array) {
        // Validates input
        if (array== null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }
    
        // Finds and returns max
        double max = array[0];
        for (int j = 1; j < array.length; j++) {
            max = max(array[j], max);
        }
    
        return max;
    }

    /**
     * Returns the maximum value in an array.
     * 
     * @param array  an array, must not be null or empty
     * @return the minimum value in the array
     * @throws IllegalArgumentException if array is null
     * @throws IllegalArgumentException if array is empty
     */
    public static float max(final float[] array) {
        // Validates input
        if (array == null) {
            throw new IllegalArgumentException("The Array must not be null");
        } else if (array.length == 0) {
            throw new IllegalArgumentException("Array cannot be empty.");
        }

        // Finds and returns max
        float max = array[0];
        for (int j = 1; j < array.length; j++) {
            max = max(array[j], max);
        }

        return max;
    }
     
    /**
     * Gets the maximum of three double values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the largest of the values
     */
    public static double max(final double a, final double b, final double c) {
        return max(max(a, b), c);
    }

    /**
     * Gets the maximum of two double values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @return  the largest of the values
     */
    public static double max(final double a, final double b) {
        if(Double.isNaN(a)) {
            return b;
        } else
        if(Double.isNaN(b)) {
            return a;
        } else {
            return Math.max(a, b);
        }
    }

    /**
     * Gets the maximum of three float values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @param c  value 3
     * @return  the largest of the values
     */
    public static float max(final float a, final float b, final float c) {
        return max(max(a, b), c);
    }

    /**
     * Gets the maximum of two float values.
     * 
     * NaN is only returned if all numbers are NaN as per IEEE-754r. 
     *
     * @param a  value 1
     * @param b  value 2
     * @return  the largest of the values
     */
    public static float max(final float a, final float b) {
        if(Float.isNaN(a)) {
            return b;
        } else
        if(Float.isNaN(b)) {
            return a;
        } else {
            return Math.max(a, b);
        }
    }

}