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Copyright 2010, Google Inc.
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
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contributors may be used to endorse or promote products derived from
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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
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.model;

import java.io.IOException;
import java.io.Writer;
import java.util.LinkedList;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonView;

import com.google.refine.util.JsonViews;
import com.google.refine.util.ParsingUtilities;

public class ColumnGroup  {
    final public int    startColumnIndex;
    final public int    columnSpan;
    final public int    keyColumnIndex; // could be -1 if there is no key cell 
    
    transient public ColumnGroup        parentGroup;
    transient public List<ColumnGroup>  subgroups;
    
    @JsonCreator
    public ColumnGroup(
            @JsonProperty("startColumnIndex")
            int startColumnIndex,
            @JsonProperty("columnSpan")
            int columnSpan,
            @JsonProperty("keyColumnIndex")
            int keyColumnIndex) {
        this.startColumnIndex = startColumnIndex;
        this.columnSpan = columnSpan;
        this.keyColumnIndex = keyColumnIndex;
        internalInitialize();
    }
    
    @JsonProperty("startColumnIndex")
    public int getStartColumnIndex() {
        return startColumnIndex;
    }
    
    @JsonProperty("columnSpan")
    public int getColumnSpan() {
        return columnSpan;
    }
    
    @JsonProperty("keyColumnIndex")
    public int getKeyColumnIndex() {
        return keyColumnIndex;
    }
    
    @JsonProperty("subgroups")
    @JsonView(JsonViews.NonSaveMode.class)
    @JsonInclude(Include.NON_EMPTY)
    public List<ColumnGroup> getSubGroups() {
        return subgroups;
    }
    
    public boolean contains(ColumnGroup g) {
        return (g.startColumnIndex >= startColumnIndex &&
            g.startColumnIndex < startColumnIndex + columnSpan);
    }
    
    public void save(Writer writer) {
        try {
            ParsingUtilities.defaultWriter.writeValue(writer, this);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    static public ColumnGroup load(String s) throws IOException {
        return ParsingUtilities.mapper.readValue(s, ColumnGroup.class);
    }
    
    protected void internalInitialize() {
        subgroups = new LinkedList<ColumnGroup>();
    }
    
    @Override
    public String toString() {
        return String.format("%d:%d:k=%d",startColumnIndex,columnSpan,keyColumnIndex);
    }
}