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/*******************************************************************************
 * Copyright (C) 2018 Arpit Shah
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 ******************************************************************************/
package com.artos.utils;

import java.io.File;

/**
 * 
 * 
 *
 */
public class Tree {

	/**
	 * Print the directory tree and its file names.
	 * 
	 * @param dir
	 *            directory
	 * @return String formatted tree structure
	 */
	public static String printDirectoryTree(File dir) {
		if (!dir.isDirectory()) {
			throw new IllegalArgumentException("folder is not a Directory");
		}
		int indent = 0;
		StringBuilder sb = new StringBuilder();
		printDirectoryTree(dir, indent, sb);
		return sb.toString();
	}

	private static void printDirectoryTree(File dir, int indent, StringBuilder sb) {
		if (!dir.isDirectory()) {
			throw new IllegalArgumentException("file is not a Directory");
		}
		sb.append(getIndentString(indent));
		sb.append("+--");
		sb.append(dir.getName());
		sb.append("/");
		sb.append("\n");
		for (File file : dir.listFiles()) {
			if (file.isDirectory()) {
				printDirectoryTree(file, indent + 1, sb);
			} else {
				printFile(file, indent + 1, sb);
			}
		}

	}

	private static void printFile(File file, int indent, StringBuilder sb) {
		sb.append(getIndentString(indent));
		sb.append("+--");
		sb.append(file.getName());
		sb.append("\n");
	}

	private static String getIndentString(int indent) {
		StringBuilder sb = new StringBuilder();
		for (int i = 0; i < indent; i++) {
			sb.append("|  ");
		}
		return sb.toString();
	}
}