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/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed 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.nd4j.linalg.util;

import org.nd4j.linalg.api.ndarray.INDArray;

import java.util.Arrays;

/**
 * Linear algebra exceptions
 *
 * @author Adam Gibson
 */
public class LinAlgExceptions {
    /**
     * Asserts both arrays be the same length
     * @param n
     * @param n2
     */
    public static void assertSameLength(INDArray n, INDArray n2) {
        if (n.length() != n2.length())
            throw new IllegalStateException("Mis matched lengths: ["+n.length()+"] != ["+n2.length()+"]");
    }

    public static void assertSameShape(INDArray n, INDArray n2) {
        if( !Arrays.equals( n.shape(),n2.shape() ) )
            throw new IllegalStateException("Mis matched shapes");
    }

    public static void assertRows(INDArray n, INDArray n2) {
        if (n.rows() != n2.rows())
            throw new IllegalStateException("Mis matched rows");
    }


    public static void assertVector(INDArray...arr) {
        for(INDArray a1 : arr)
            assertVector(a1);
    }

    public static void assertMatrix(INDArray...arr) {
        for(INDArray a1 : arr)
            assertMatrix(a1);
    }

    public static void assertVector(INDArray arr) {
        if(!arr.isVector())
            throw new IllegalArgumentException("Array must be a vector");
    }

    public static void assertMatrix(INDArray arr) {
        if(arr.shape().length > 2)
            throw new IllegalArgumentException("Array must be a matrix");
    }



    /**
     * Asserts matrix multiply rules (columns of left == rows of right or rows of left == columns of right)
     *
     * @param nd1 the left ndarray
     * @param nd2 the right ndarray
     */
    public static void assertMultiplies(INDArray nd1, INDArray nd2) {
        if (nd1.columns() == nd2.rows() || nd1.rows() == nd2.columns()){
            return;
        }
        throw new IllegalStateException("Column of left array " + nd1.columns() + " != rows of right " + nd2.rows() +
                " or rows of left array "  + nd1.rows() + " != columns of right " + nd2.columns());
    }


    public static void assertColumns(INDArray n, INDArray n2) {
        if (n.columns() != n2.columns())
            throw new IllegalStateException("Mis matched rows");
    }

    public static void assertValidNum(INDArray n) {
        INDArray linear = n.linearView();
        for (int i = 0; i < linear.length(); i++) {
            double d = linear.getDouble(i);
            if (Double.isNaN(d) || Double.isInfinite(d))
                throw new IllegalStateException("Found infinite or nan");

        }
    }

}