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package org.deeplearning4j.ui.stats.impl;

import java.io.*;
import java.nio.charset.Charset;
import java.util.Map;

/**
 * Utilities for use in {@link SbeStatsInitializationReport} and {@link SbeStatsReport}
 *
 * @author Alex Black
 */
public class SbeUtil {

    public static final Charset UTF8 = Charset.forName("UTF-8");
    public static final byte[] EMPTY_BYTES = new byte[0];    //Also equivalent to "".getBytes(UTF8);

    private SbeUtil(){ }

    public static int length(byte[] bytes) {
        if (bytes == null) return 0;
        return bytes.length;
    }

    public static int length(byte[][] bytes) {
        if (bytes == null) return 0;
        int count = 0;
        for (int i = 0; i < bytes.length; i++) {
            if (bytes[i] != null) count += bytes[i].length;
        }
        return count;
    }

    public static int length(byte[][][] bytes) {
        if(bytes == null) return 0;
        int count = 0;
        for(byte[][] arr : bytes ){
            count += length(arr);
        }
        return count;
    }

    public static int length(String str) {
        if (str == null) return 0;
        return str.length();
    }

    public static int length(String[] arr) {
        if (arr == null || arr.length == 0) return 0;
        int sum = 0;
        for (String s : arr) sum += length(s);
        return sum;
    }

    public static byte[] toBytes(boolean present, String str) {
        if (!present || str == null) return EMPTY_BYTES;
        return str.getBytes(UTF8);
    }

    public static byte[][] toBytes(boolean present, String[] str) {
        if (str == null) return null;
        byte[][] b = new byte[str.length][0];
        for (int i = 0; i < str.length; i++) {
            if (str[i] == null) continue;
            b[i] = toBytes(present, str[i]);
        }
        return b;
    }

    public static byte[][][] toBytes(Map map) {
        if (map == null) return null;
        byte[][][] b = new byte[map.size()][2][0];
        int i=0;
        for(Map.Entry entry : map.entrySet()){
            b[i][0] = toBytes(true,entry.getKey());
            b[i][1] = toBytes(true, entry.getValue());
            i++;
        }
        return b;
    }

    public static byte[] toBytesSerializable(Serializable serializable){
        if(serializable == null) return EMPTY_BYTES;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try(ObjectOutputStream oos = new ObjectOutputStream(baos)){
            oos.writeObject(serializable);
        }catch (IOException e){
            throw new RuntimeException("Unexpected IOException during serialization",e);
        }
        return baos.toByteArray();
    }

    public static Serializable fromBytesSerializable(byte[] bytes){
        if(bytes == null || bytes.length == 0) return null;
        ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
        try(ObjectInputStream ois = new ObjectInputStream(bais)){
            return (Serializable)ois.readObject();
        } catch (IOException e) {
            throw new RuntimeException("Unexpected IOException during deserialization",e);
        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }
    }
}