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/**
 * Copyright 1999-2014 dangdang.com.
 *
 * 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 com.alibaba.dubbo.common.serialize.support.kryo;

import com.alibaba.dubbo.common.serialize.Cleanable;
import com.alibaba.dubbo.common.serialize.ObjectInput;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.KryoException;
import com.esotericsoftware.kryo.io.Input;

import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Type;

/**
 * @author lishen
 */
public class KryoObjectInput implements ObjectInput, Cleanable {

    private Kryo kryo = KryoFactory.getDefaultFactory().getKryo();
    private Input input;

    public KryoObjectInput(InputStream inputStream) {
        input = new Input(inputStream);
    }

    public boolean readBool() throws IOException {
        try {
            return input.readBoolean();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public byte readByte() throws IOException {
        try {
            return input.readByte();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public short readShort() throws IOException {
        try {
            return input.readShort();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public int readInt() throws IOException {
        try {
            return input.readInt();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public long readLong() throws IOException {
        try {
            return input.readLong();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public float readFloat() throws IOException {
        try {
            return input.readFloat();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public double readDouble() throws IOException {
        try {
            return input.readDouble();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public byte[] readBytes() throws IOException {
        try {
            int len = input.readInt();
            if (len < 0) {
                return null;
            } else if (len == 0) {
                return new byte[]{};
            } else {
                return input.readBytes(len);
            }
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public String readUTF() throws IOException {
        // TODO
        try {
//            return kryo.readObject(input, String.class);
            return input.readString();
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }

    public Object readObject() throws IOException, ClassNotFoundException {
        // TODO
//        throw new UnsupportedOperationException();
        try {
            return kryo.readClassAndObject(input);
        } catch (KryoException e) {
            throw new IOException(e);
        }
    }


    @SuppressWarnings("unchecked")
    public  T readObject(Class clazz) throws IOException, ClassNotFoundException {
        // TODO optimization
//            try {
//                return (T) kryo.readClassAndObject(input);
//            } catch (KryoException e) {
//                throw new IOException(e);
//            }
        return (T) readObject();
    }

    @SuppressWarnings("unchecked")
    public  T readObject(Class clazz, Type type) throws IOException, ClassNotFoundException {
//            try {
//                return readObject(clazz);
//            } catch (KryoException e) {
//                throw new IOException(e);
//            }
        // TODO optimization
        return (T) readObject(clazz);
    }

    public void cleanup() {
        KryoFactory.getDefaultFactory().returnKryo(kryo);
        kryo = null;
    }
}