/*
 * Copyright 2012-2016 the original author or authors.
 *
 * 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.springframework.batch.core.repository.dao;

import org.junit.Test;
import org.springframework.batch.core.repository.ExecutionContextSerializer;

import java.io.*;
import java.math.BigDecimal;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.hasEntry;

/**
 * Abstract test class for {@code ExecutionContextSerializer} implementations. Provides a minimum on test methods
 * that should pass for each {@code ExecutionContextSerializer} implementation.
 *
 * @author Thomas Risberg
 * @author Michael Minella
 * @author Marten Deinum
 */
public abstract class AbstractExecutionContextSerializerTests {

    @Test
    public void testSerializeAMap() throws Exception {
        Map<String, Object> m1 = new HashMap<String, Object>();
        m1.put("object1", Long.valueOf(12345L));
        m1.put("object2", "OBJECT TWO");
        // Use a date after 1971 (otherwise daylight saving screws up)...
        m1.put("object3", new Date(123456790123L));
        m1.put("object4", new Double(1234567.1234D));

        Map<String, Object> m2 = serializationRoundTrip(m1);

        compareContexts(m1, m2);
    }

    @Test
    public void testComplexObject() throws Exception {
        Map<String, Object> m1 = new HashMap<String, Object>();
        ComplexObject o1 = new ComplexObject();
        o1.setName("02345");
        Map<String, Object> m = new HashMap<String, Object>();
        m.put("object1", Long.valueOf(12345L));
        m.put("object2", "OBJECT TWO");
        o1.setMap(m);
        o1.setNumber(new BigDecimal("12345.67"));
        ComplexObject o2 = new ComplexObject();
        o2.setName("Inner Object");
        o2.setMap(m);
        o2.setNumber(new BigDecimal("98765.43"));
        o1.setObj(o2);
        m1.put("co", o1);

        Map<String, Object> m2 = serializationRoundTrip(m1);

        compareContexts(m1, m2);
    }

    @Test (expected=IllegalArgumentException.class)
    public void testNullSerialization() throws Exception {
        getSerializer().serialize(null, null);
    }

    protected void compareContexts(Map<String, Object> m1, Map<String, Object> m2) {

        for (Map.Entry<String, Object> entry : m1.entrySet()) {
            assertThat(m2, hasEntry(entry.getKey(), entry.getValue()));
        }
    }

    protected Map<String, Object> serializationRoundTrip(Map<String, Object> m1) throws IOException {
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        getSerializer().serialize(m1, out);

        String s = new String(out.toByteArray(), "ISO-8859-1");

        InputStream in = new ByteArrayInputStream(s.getBytes("ISO-8859-1"));
        Map<String, Object> m2 = getSerializer().deserialize(in);
        return m2;
    }


    protected abstract ExecutionContextSerializer getSerializer();

    public static class ComplexObject implements Serializable {
        private static final long serialVersionUID = 1L;
        private String name;
        private BigDecimal number;
        private ComplexObject obj;
        private Map<String,Object> map;

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public BigDecimal getNumber() {
            return number;
        }

        public void setNumber(BigDecimal number) {
            this.number = number;
        }

        public ComplexObject getObj() {
            return obj;
        }

        public void setObj(ComplexObject obj) {
            this.obj = obj;
        }

        public Map<String,Object> getMap() {
            return map;
        }

        public void setMap(Map<String,Object> map) {
            this.map = map;
        }


        @Override
        public boolean equals(Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }

            ComplexObject that = (ComplexObject) o;

            if (map != null ? !map.equals(that.map) : that.map != null) {
                return false;
            }
            if (name != null ? !name.equals(that.name) : that.name != null) {
                return false;
            }
            if (number != null ? !number.equals(that.number) : that.number != null) {
                return false;
            }
            if (obj != null ? !obj.equals(that.obj) : that.obj != null) {
                return false;
            }

            return true;
        }

        @Override
        public int hashCode() {
            int result;
            result = (name != null ? name.hashCode() : 0);
            result = 31 * result + (number != null ? number.hashCode() : 0);
            result = 31 * result + (obj != null ? obj.hashCode() : 0);
            result = 31 * result + (map != null ? map.hashCode() : 0);
            return result;
        }

        @Override
        public String toString() {
            return "ComplexObject [name=" + name + ", number=" + number + "]";
        }
    }

}