package com.fp.general.helper;

import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.hibernate.LockMode;
import org.hibernate.LockOptions;
import org.hibernate.type.Type;

public final class ArrayHelper
{

    public static final boolean TRUE[] = {
        true
    };
    public static final boolean FALSE[] = {
        false
    };
    public static final String EMPTY_STRING_ARRAY[] = new String[0];
    public static final int EMPTY_INT_ARRAY[] = new int[0];
    public static final boolean EMPTY_BOOLEAN_ARRAY[] = new boolean[0];
    public static final Class EMPTY_CLASS_ARRAY[] = new Class[0];
    public static final Object EMPTY_OBJECT_ARRAY[] = new Object[0];
    public static final Type EMPTY_TYPE_ARRAY[] = new Type[0];
    private static int SEED = 23;
    private static int PRIME_NUMER = 37;

    public static int indexOf(Object array[], Object object)
    {
        for(int i = 0; i < array.length; i++)
        {
            if(array[i].equals(object))
            {
                return i;
            }
        }

        return -1;
    }

    public static String[] toStringArray(Object objects[])
    {
        int length = objects.length;
        String result[] = new String[length];
        for(int i = 0; i < length; i++)
        {
            result[i] = objects[i].toString();
        }

        return result;
    }

    public static String[] fillArray(String value, int length)
    {
        String result[] = new String[length];
        Arrays.fill(result, value);
        return result;
    }

    public static int[] fillArray(int value, int length)
    {
        int result[] = new int[length];
        Arrays.fill(result, value);
        return result;
    }

    public static LockMode[] fillArray(LockMode lockMode, int length)
    {
        LockMode array[] = new LockMode[length];
        Arrays.fill(array, lockMode);
        return array;
    }

    public static LockOptions[] fillArray(LockOptions lockOptions, int length)
    {
        LockOptions array[] = new LockOptions[length];
        Arrays.fill(array, lockOptions);
        return array;
    }

    public static String[] toStringArray(Collection coll)
    {
        return (String[])coll.toArray(new String[coll.size()]);
    }

    public static String[][] to2DStringArray(Collection coll)
    {
        return (String[][])coll.toArray(new String[coll.size()][]);
    }

    public static int[][] to2DIntArray(Collection coll)
    {
        return (int[][])coll.toArray(new int[coll.size()][]);
    }

    public static Type[] toTypeArray(Collection coll)
    {
        return (Type[])coll.toArray(new Type[coll.size()]);
    }

    public static int[] toIntArray(Collection coll)
    {
        Iterator iter = coll.iterator();
        int arr[] = new int[coll.size()];
        int i = 0;
        while(iter.hasNext())
        {
            arr[i++] = ((Integer)iter.next()).intValue();
        }
        return arr;
    }

    public static boolean[] toBooleanArray(Collection coll)
    {
        Iterator iter = coll.iterator();
        boolean arr[] = new boolean[coll.size()];
        int i = 0;
        while(iter.hasNext())
        {
            arr[i++] = ((Boolean)iter.next()).booleanValue();
        }
        return arr;
    }

    public static Object[] typecast(Object array[], Object to[])
    {
        return Arrays.asList(array).toArray(to);
    }

    public static List toList(Object array)
    {
        if(array instanceof Object[])
        {
            return Arrays.asList((Object[])array);
        }
        int size = Array.getLength(array);
        ArrayList list = new ArrayList(size);
        for(int i = 0; i < size; i++)
        {
            list.add(Array.get(array, i));
        }

        return list;
    }

    public static String[] slice(String strings[], int begin, int length)
    {
        String result[] = new String[length];
        System.arraycopy(strings, begin, result, 0, length);
        return result;
    }

    public static Object[] slice(Object objects[], int begin, int length)
    {
        Object result[] = new Object[length];
        System.arraycopy(((objects)), begin, ((result)), 0, length);
        return result;
    }

    public static List toList(Iterator iter)
    {
        List list = new ArrayList();
        for(; iter.hasNext(); list.add(iter.next())) { }
        return list;
    }

    public static String[] join(String x[], String y[])
    {
        String result[] = new String[x.length + y.length];
        System.arraycopy(x, 0, result, 0, x.length);
        System.arraycopy(y, 0, result, x.length, y.length);
        return result;
    }

    public static String[] join(String x[], String y[], boolean use[])
    {
        String result[] = new String[x.length + countTrue(use)];
        System.arraycopy(x, 0, result, 0, x.length);
        int k = x.length;
        for(int i = 0; i < y.length; i++)
        {
            if(use[i])
            {
                result[k++] = y[i];
            }
        }

        return result;
    }

    public static int[] join(int x[], int y[])
    {
        int result[] = new int[x.length + y.length];
        System.arraycopy(x, 0, result, 0, x.length);
        System.arraycopy(y, 0, result, x.length, y.length);
        return result;
    }

    private ArrayHelper()
    {
    }

    public static String toString(Object array[])
    {
        StringBuffer sb = new StringBuffer();
        sb.append("[");
        for(int i = 0; i < array.length; i++)
        {
            sb.append(array[i]);
            if(i < array.length - 1)
            {
                sb.append(",");
            }
        }

        sb.append("]");
        return sb.toString();
    }

    public static boolean isAllNegative(int array[])
    {
        for(int i = 0; i < array.length; i++)
        {
            if(array[i] >= 0)
            {
                return false;
            }
        }

        return true;
    }

    public static boolean isAllTrue(boolean array[])
    {
        for(int i = 0; i < array.length; i++)
        {
            if(!array[i])
            {
                return false;
            }
        }

        return true;
    }

    public static int countTrue(boolean array[])
    {
        int result = 0;
        for(int i = 0; i < array.length; i++)
        {
            if(array[i])
            {
                result++;
            }
        }

        return result;
    }

    public static boolean isAllFalse(boolean array[])
    {
        for(int i = 0; i < array.length; i++)
        {
            if(array[i])
            {
                return false;
            }
        }

        return true;
    }

    public static void addAll(Collection collection, Object array[])
    {
        collection.addAll(Arrays.asList(array));
    }

    public static int[] getBatchSizes(int maxBatchSize)
    {
        int batchSize = maxBatchSize;
        int n;
        for(n = 1; batchSize > 1; n++)
        {
            batchSize = getNextBatchSize(batchSize);
        }

        int result[] = new int[n];
        batchSize = maxBatchSize;
        for(int i = 0; i < n; i++)
        {
            result[i] = batchSize;
            batchSize = getNextBatchSize(batchSize);
        }

        return result;
    }

    private static int getNextBatchSize(int batchSize)
    {
        if(batchSize <= 10)
        {
            return batchSize - 1;
        }
        if(batchSize / 2 < 10)
        {
            return 10;
        } else
        {
            return batchSize / 2;
        }
    }

    public static int hash(Object array[])
    {
        int length = array.length;
        int seed = SEED;
        for(int index = 0; index < length; index++)
        {
            seed = hash(seed, array[index] != null ? array[index].hashCode() : 0);
        }

        return seed;
    }

    public static int hash(char array[])
    {
        int length = array.length;
        int seed = SEED;
        for(int index = 0; index < length; index++)
        {
            seed = hash(seed, array[index]);
        }

        return seed;
    }

    public static int hash(byte bytes[])
    {
        int length = bytes.length;
        int seed = SEED;
        for(int index = 0; index < length; index++)
        {
            seed = hash(seed, bytes[index]);
        }

        return seed;
    }

    private static int hash(int seed, int i)
    {
        return PRIME_NUMER * seed + i;
    }

    public static boolean isEquals(Object o1[], Object o2[])
    {
        if(o1 == o2)
        {
            return true;
        }
        if(o1 == null || o2 == null)
        {
            return false;
        }
        int length = o1.length;
        if(length != o2.length)
        {
            return false;
        }
        for(int index = 0; index < length; index++)
        {
            if(!o1[index].equals(o2[index]))
            {
                return false;
            }
        }

        return true;
    }

    public static boolean isEquals(char o1[], char o2[])
    {
        if(o1 == o2)
        {
            return true;
        }
        if(o1 == null || o2 == null)
        {
            return false;
        }
        int length = o1.length;
        if(length != o2.length)
        {
            return false;
        }
        for(int index = 0; index < length; index++)
        {
            if(o1[index] != o2[index])
            {
                return false;
            }
        }

        return true;
    }

    public static boolean isEquals(byte b1[], byte b2[])
    {
        if(b1 == b2)
        {
            return true;
        }
        if(b1 == null || b2 == null)
        {
            return false;
        }
        int length = b1.length;
        if(length != b2.length)
        {
            return false;
        }
        for(int index = 0; index < length; index++)
        {
            if(b1[index] != b2[index])
            {
                return false;
            }
        }

        return true;
    }

}
