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package org.nuiton.i18n.spi;

/*-
 * #%L
 * I18n :: Api
 * %%
 * Copyright (C) 2004 - 2017 Code Lutin, Ultreia.io
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */

import java.io.BufferedWriter;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.stream.Collectors;

/**
 * Represents a getter file with all his detected keys.
 * Created by tchemit on 29/10/17.
 *
 * @author Tony Chemit - [email protected]
 */
public class GetterFile {

    private static final String GETTER_EXTENSION = ".getter";

    private final File file;
    private final String name;
    private final Set keys;

    public static List load(File gettersDirectory) throws IOException {
        if (gettersDirectory.exists()) {
            return Files
                    .walk(gettersDirectory.toPath(), 1)
                    .filter(p -> Files.isRegularFile(p) && p.toFile().getName().endsWith(GETTER_EXTENSION))
                    .map(Path::toFile)
                    .map(f -> new GetterFile(f.getParentFile(), f.getName()))
                    .collect(Collectors.toList());
        } else {
            return Collections.emptyList();
        }
    }

    public GetterFile(File gettersDirectory, String name) {
        this.file = new File(gettersDirectory, name);
        this.name = name;
        this.keys = new TreeSet<>();
    }

    public synchronized void addKey(String key) {
        keys.add(key);
    }

    public synchronized void addKeys(Collection result) {
        keys.addAll(result);
    }

    public void load() throws IOException {
        if (file.exists()) {
            List existingKeys = Files.readAllLines(file.toPath(), StandardCharsets.UTF_8);
            keys.addAll(existingKeys);
        }
    }

    public void store() throws IOException {
        if (!file.getParentFile().exists()) {
            Files.createDirectories(file.getParentFile().toPath());
        }
        try (BufferedWriter writer = Files.newBufferedWriter(file.toPath(), StandardCharsets.UTF_8)) {
            for (String key : keys) {
                writer.write(key);
                writer.newLine();
            }
        }
    }

    public File getFile() {
        return file;
    }

    public String getName() {
        return name;
    }

    public Set getKeys() {
        return keys;
    }

    public void delete() {
        try {
            Files.deleteIfExists(file.toPath());
        } catch (IOException e) {
            throw new IllegalStateException("Can't delete getter file " + file, e);
        }
    }

    public boolean isNotEmpty() {
        return !keys.isEmpty();
    }
}