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package com.paypal.butterfly.utilities.operations.file;

import com.paypal.butterfly.extensions.api.TransformationContext;
import com.paypal.butterfly.extensions.api.TOExecutionResult;
import com.paypal.butterfly.extensions.api.exception.TransformationOperationException;
import com.paypal.butterfly.utilities.operations.AbstractToOperation;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;

/**
 * Copies the content of a directory from one location to another.
 * The files to be copied include sub-folders and their files, coming from relative
 * or absolute location. The path to the files to be copied are preserved, and those
 * folders are also copied to the destination location. If the destination directory
 * does not exist, it is created. But, if it does, then the content to be copied is
 * merged with the destination content, with the source taking precedence.
 * 

 * Note: if all you want is to copy a set of specific files from one
 * location to another, then use a multiple transformation operation
 * (see {@code TransformationTemplate.addMultiple()}) with {@link CopyFile}
 *
 * @see CopyFile
 * @see MoveFile
 * @see MoveDirectory
 *
 * @author facarvalho
 */
public class CopyDirectory extends AbstractToOperation {

    private static final String DESCRIPTION = "Copy directory content from %s to %s";

    /**
     * Operation to copy the content of a directory from one location to another.
     * The files to be copied include sub-folders and their files, coming rom relative
     * or absolute location. The path to the files to be copied are preserved, and those
     * folders are also copied to the destination location. If the destination directory
     * does not exist, it is created. But, if it does, then the content to be copied is
     * merged with the destination content, with the source taking precedence.
     */
    public CopyDirectory() {
        super(DESCRIPTION);
    }

    @Override
    protected TOExecutionResult execution(File transformedAppFolder, TransformationContext transformationContext) {
        // TODO Validation must be done here!!!
        File filesFrom = getAbsoluteFile(transformedAppFolder, transformationContext);
        File fileTo = getFileTo(transformedAppFolder, transformationContext);
        TOExecutionResult result = null;

        try {
            FileUtils.copyDirectory(filesFrom, fileTo);
            String details = String.format("Files from '%s' have been copied to '%s'", getRelativePath(transformedAppFolder, filesFrom), getRelativePath(transformedAppFolder, fileTo));
            result = TOExecutionResult.success(this, details);
        } catch (IOException e) {
            result = TOExecutionResult.error(this, new TransformationOperationException("Directory could not be copied", e));
        }

        return result;
    }

}