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/*  Copyright 1999-2015 Vince Via [email protected]
    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.viaoa.util;

import java.lang.reflect.*;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.Map;

/**
 * Compare two objects, finding which fields do not match.
 */
public class OAObjectCompare {
    // hashmap used to add a Visitor pattern
    IdentityHashMap hmVisitor = new IdentityHashMap();
    private String leftName;
    private String rightName;
    
    public OAObjectCompare() {
        setObjectNames(null, null);
    }
    public boolean compare(Object objLeft, Object objRight) throws IllegalAccessException {
        String s = objLeft == null ? "" : objLeft.getClass().getName();
        int x = s.lastIndexOf('.');
        if (x > 0) s = s.substring(x+1);
        return _compare(s, objLeft, objRight);
    }    
    private boolean _compare(String propertyPath, Object objLeft, Object objRight) throws IllegalAccessException {
        boolean bResult = true;
        bResult = _compare(propertyPath, objLeft, objRight, true);
        return bResult;
    }

    public void setObjectNames(String leftName, String rightName) {
        setLeftObjectName(leftName);
        setRightObjectName(leftName);
    }
    public String getLeftObjectName() {
        return leftName;
    }
    public void setLeftObjectName(String name) {
        if (name == null) name = "leftObj";
        leftName = name;
    }
    public String getRightObjectName() {
        return rightName;
    }
    public void setRightObjectName(String name) {
        if (name == null) name = "rightObj";
        rightName = name;
    }
    
    
    protected boolean _compare(String propertyPath, Object objLeft, Object objRight, boolean bReportNotEquals) throws IllegalAccessException {
        if (objLeft == objRight) return true;
        if (objLeft == null || objRight == null) {
            if (bReportNotEquals) foundOne(propertyPath, objLeft, objRight);
            return false;
        }

        if (!objLeft.getClass().equals(objRight.getClass())) {
            if (bReportNotEquals) foundOne(propertyPath, objLeft, objRight);
            return false;
        }
        
        String s = objLeft.getClass().getName();
        if (s.indexOf("java.") == 0) {
            boolean b = objLeft.equals(objRight);
            if (!b && bReportNotEquals) {
                foundOne(propertyPath, objLeft, objRight);
            }
            return b;
        }
        
        if (objLeft.getClass().isArray()) {
            int x = Array.getLength(objLeft);
            boolean bMatch = true;
            if (Array.getLength(objRight) != x) {
                bMatch = false;
                if (bReportNotEquals) {
                    foundOne(propertyPath, "length="+Array.getLength(objLeft), "length="+Array.getLength(objRight));
                }
            }

            HashMap hm = new HashMap((int)(x * 1.5), .85f);
            for (int i=0; i ex : hm.entrySet()) {
                Object key = ex.getKey();
                bMatch = false;
                if (bReportNotEquals) {
                    int pos = OAArray.indexOf((Object[]) objLeft, ex.getValue());
                    foundOne(propertyPath+"["+pos+"]", key, "not found");
                }
            }
            return bMatch;
        }

        boolean b = false;
        if (!bReportNotEquals) b = objLeft.equals(objRight);
        
        if (!b && bReportNotEquals) {
            b = _compareFields(propertyPath, objLeft, objRight, bReportNotEquals);
        }
        return b;
    }

    protected Object getKey(Object obj) {
        return obj;
    }
    
    private boolean _compareFields(String propertyPath, Object objLeft, Object objRight, boolean bReportNotEquals) throws IllegalAccessException {
        // check to see if these objects have already been compared
        Object objx = hmVisitor.get(objLeft);
        if (objx == objRight) {
            objx = hmVisitor.get(objRight);
            if (objx == objLeft) {
                return true; // already compared
            }
        }
        hmVisitor.put(objLeft, objRight);
        hmVisitor.put(objRight, objLeft);

        Field[] objFields = objLeft.getClass().getDeclaredFields();
        AccessibleObject.setAccessible(objFields, true);
        boolean bResult = true;
        for (Field field : objFields) {
            if (field.getName().indexOf('$') >= 0) continue;
            if (Modifier.isStatic(field.getModifiers())) continue;
            if (Modifier.isTransient(field.getModifiers())) continue;

            Object oL = field.get(objLeft);
            Object oR = field.get(objRight);
            
            if (!_compare(propertyPath+"."+field.getName(), oL, oR, bReportNotEquals) ) {
                bResult = false;
            }
        }
        return bResult;
    }
    
    public void foundOne(String propertyPath, Object objLeft, Object objRight) {
        String s1 = objLeft+"";
        if (s1.length() > 40) s1 = s1.substring(0,40)+"...";
        String s2 = objRight+"";
        if (s2.length() > 40) s2 = s2.substring(0,40)+"...";
        System.out.println(propertyPath+": "+leftName+"="+s1+", "+rightName+"="+s2);
    }
    
    public static void main(String[] args) throws Exception {
        Object obj1 = "test";
        Object obj2 = null;
        
        OAObjectCompare oc = new OAObjectCompare() {
            @Override
            public void foundOne(String propertyPath, Object objLeft, Object objRight) {
                super.foundOne(propertyPath, objLeft, objRight);
            }
        };
        oc.compare(obj1, obj2);
    }
}