/*
 * ForgeGradle
 * Copyright (C) 2018 Forge Development LLC
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
 * USA
 */

package net.minecraftforge.gradle.mcp.function;

import net.minecraftforge.gradle.mcp.util.MCPEnvironment;
import net.minecraftforge.gradle.common.util.MavenArtifactDownloader;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.Reader;
import java.util.HashSet;
import java.util.Set;

public class ListLibrariesFunction implements MCPFunction {

    @Override
    public File execute(MCPEnvironment environment) {
        File output = (File)environment.getArguments().computeIfAbsent("output", (key) -> environment.getFile("libraries.txt"));

        try {
            Gson gson = new Gson();
            Reader reader = new FileReader(environment.getStepOutput(DownloadVersionJSONFunction.class));
            JsonObject json = gson.fromJson(reader, JsonObject.class);
            reader.close();

            // Gather all the libraries
            Set<File> files = new HashSet<>();
            for (JsonElement libElement : json.getAsJsonArray("libraries")) {
                JsonObject library = libElement.getAsJsonObject();
                files.add(MavenArtifactDownloader.gradle(environment.project, library.get("name").getAsString(), false));
            }

            // Write the list
            if (output.exists()) output.delete();
            output.getParentFile().mkdirs();
            output.createNewFile();
            PrintWriter writer = new PrintWriter(output);
            for (File file : files) {
                writer.println("-e=" + file.getAbsolutePath());
            }
            writer.flush();
            writer.close();
        } catch (IOException ex) {
            throw new RuntimeException(ex);
        }

        return output;
    }

}

@@ -1105,16 +1105,48 @@
 o.File;%0A
+import java.io.FileOutputStream%0A
 import j
@@ -1235,32 +1235,66 @@
 java.io.Reader;%0A
+import java.io.OutputStreamWriter%0A
 import java.util
@@ -1324,16 +1324,57 @@
 til.Set;
+%0Aimport java.nio.charset.StandardCharsets
 %0A%0Apublic
@@ -2461,22 +2461,92 @@
 tWriter(
-output
+new OutputStreamWriter(new FileOutputStream(output), StandardCharsets.UTF_8)
 );%0A     

Write "libraries.txt" in UTF-8.