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Copyright 2010, Google Inc.
All rights reserved.

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modification, are permitted provided that the following conditions are
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    * Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
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    * Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

package com.google.refine.util;

import java.util.List;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.JsonNodeType;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.google.common.collect.Lists;
import com.google.refine.expr.util.JsonValueConverter;


public class JSONUtilities {
    
    static public ObjectNode getObject(ObjectNode obj, String key) {
    	JsonNode node = obj.get(key);
    	if(node != null && node instanceof ObjectNode) {
    		return (ObjectNode)node;
    	}
    	return null;
    }
    
    static public String getString(JsonNode obj, String key, String def) {
    	if (obj.has(key)) {
    		return obj.get(key).textValue();
    	} else {
    		return def;
    	}
    }
    
    static public int getInt(JsonNode obj, String key, int def) {
    	if (obj.has(key)) {
    		return obj.get(key).asInt(def);
    	} else {
    		return def;
    	}
    }
    
    static public boolean getBoolean(JsonNode obj, String key, boolean def) {
        if (obj.has(key)) {
            return obj.get(key).asBoolean(def);
        } else {
            return def;
        }
    }

    static public ArrayNode getArray(ObjectNode obj, String key) {
        if( obj.has(key) && obj.get(key) instanceof ArrayNode) {
        	return (ArrayNode) obj.get(key);
        } 
        return null;
    }
    
    static public List<JsonNode> getArray(JsonNode obj, String key) {
        if (obj.has(key) && obj.get(key).getNodeType().equals(JsonNodeType.ARRAY)) {
            return Lists.newArrayList(obj.get(key).elements());
        } else {
            return null;
        }
    }

    static public int[] getIntArray(ObjectNode obj, String key) {
    	ArrayNode a = getArray(obj, key);
    	if (a == null) {
    		return new int[0];
    	}
    	int[] r = new int[a.size()];
    	int i = 0;
    	for(JsonNode n : a) {
    		r[i] = n.asInt();
    		i++;
    	}
        return r;
    }

    static public String[] getStringArray(ObjectNode obj, String key) {
        ArrayNode a = getArray(obj, key);
        if (a == null) {
        	return new String[0];
        }
        String[] r = new String[a.size()];
        
        for (int i = 0; i < r.length; i++) {
            r[i] = a.get(i).asText();
        }
        
        return r;
    }
 
    static public ObjectNode getObjectElement(ArrayNode a, int i) {
    	JsonNode n = a.get(i);
    	if (n != null && n instanceof ObjectNode) {
    		return (ObjectNode) n;
    	}
    	return null;
    }
    
    static public int getIntElement(ArrayNode a, int i, int def) {
        if (a.get(i) != null) {
            return a.get(i).asInt(def);
        }
        return def;
    }
    
    static public void append(ArrayNode sheetRecords, ObjectNode sheetRecord) {
        sheetRecords.add(sheetRecord);
    }
    
    static public void append(ArrayNode array, int v) {
        array.add(v);
    }
    
    static public void append(ArrayNode a, String element) {
        a.add(element);
    }
    
    static public void safePut(ObjectNode options, String key, JsonNode rootElement) {
        options.set(key, rootElement);
    }
    
    static public void safeInc(ObjectNode obj, String key) {
        int currentValue = getInt(obj, key, 0);
        safePut(obj, key, currentValue + 1);
    }
    
    static public void safePut(ObjectNode obj, String key, long value) {
    	obj.put(key, value);
    }
    
    static public void safePut(ObjectNode obj, String key, double value) {
    	obj.put(key, value);
    }
    
    static public void safePut(ObjectNode obj, String key, boolean value) {
    	obj.put(key, value);
    }
    
    static public void safePut(ObjectNode obj, String key, String value) {
    	obj.put(key, value);
    }

	public static Object[] toArray(ArrayNode v) {
		if (v == null) {
			return null;
		}
		Object[] result = new Object[v.size()];
		for (int i = 0; i != v.size(); i++) {
			result[i] = JsonValueConverter.convert(v.get(i));
		}
		return result;
	}

    @SuppressWarnings("rawtypes")
    public static Comparable[] toSortableArray(ArrayNode v) {
        if (v == null) {
            return null;
        }
        Comparable[] result = new Comparable[v.size()];
        for (int i = 0; i != v.size(); i++) {
            result[i] = JsonValueConverter.convertComparable(v.get(i));
        }
        return result;
    }

}
