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*/

package com.google.refine.operations.column;

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.refine.history.Change;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Project;
import com.google.refine.model.changes.ColumnRenameChange;

public class ColumnRenameOperation extends AbstractOperation {
    final protected String _oldColumnName;
    final protected String _newColumnName;

    @JsonCreator
    public ColumnRenameOperation(
        @JsonProperty("oldColumnName")
        String oldColumnName,
        @JsonProperty("newColumnName")
        String newColumnName
    ) {
        _oldColumnName = oldColumnName;
        _newColumnName = newColumnName;
    }
    
    @JsonProperty("oldColumnName")
    public String getOldColumnName() {
        return _oldColumnName;
    }

    @JsonProperty("newColumnName")
    public String getNewColumnName() {
        return _newColumnName;
    }

    @Override
    protected String getBriefDescription(Project project) {
        return "Rename column " + _oldColumnName + " to " + _newColumnName;
    }

    @Override
    protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
        if (project.columnModel.getColumnByName(_oldColumnName) == null) {
            throw new Exception("No column named " + _oldColumnName);
        }
        if (project.columnModel.getColumnByName(_newColumnName) != null) {
            throw new Exception("Another column already named " + _newColumnName);
        }
        
        Change change = new ColumnRenameChange(_oldColumnName, _newColumnName);
        
        return new HistoryEntry(historyEntryID, project, getBriefDescription(null), ColumnRenameOperation.this, change);
    }
}
