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/******************************************************************************
 * Copyright 2014-2018 Alexandru Motriuc                                      *
 *                                                                            *
 ******************************************************************************
 * Licensed under the Apache License, Version 2.0 (the "License");            *
 * you may not use this file except in compliance with the License.           *
 * You may obtain a copy of the License at                                    *
 * http://www.apache.org/licenses/LICENSE-2.0                                 *
 * Unless required by applicable law or agreed to in writing, software        *
 * distributed under the License is distributed on an "AS IS" BASIS,          *
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   *
 * See the License for the specific language governing permissions and        *
 * limitations under the License.                                             *
 ******************************************************************************/
package com.amit.api.compiler.generator;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.HashSet;
import java.util.Set;

public class GeneratedFileList {
	private final Path outPath;
	private final Path filePath;
	private Set files = new HashSet();

	public GeneratedFileList(Path outPath) throws IOException {
		this.outPath = outPath;
		this.filePath = outPath.resolve(".generated.amit");
		load();
		cleanup();
	}

	public void addFile(Path file) {
		files.add(file);
	}

	public void save() throws FileNotFoundException,
			UnsupportedEncodingException {
		try (PrintWriter writer = new PrintWriter(filePath.toFile(), "UTF-8")) {
			for (Path p : files) {
				writer.println(p.toString());
			}
		}
	}

	private void load() throws IOException {
		try {
			for (String file : Files.readAllLines(filePath)) {
				addFile(Paths.get(file));
			}
		} catch (NoSuchFileException e) {
			// do nothing
		}
	}

	private void cleanup() {
		for (Path path : files) {
			Path todelete = outPath.resolve(path);
			todelete.toFile().delete();
		}
		files.clear();
	}
}