package net.danielostrowski.wiipackageget;

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

public class WiiPackageGet {
    private static final String PACKAGES = "Packages";
    private static final String INSTALLENDS = "installends";
    private static final String URL_PREFIX = "http://archive.debian.org/debian/";

    public static void main(String[] args) throws Exception {
        if (!Files.exists(Paths.get(PACKAGES))) {
            throw new Exception("Please download and extract http://archive.debian.org/debian/dists/jessie/main/" +
                    "binary-powerpc/Packages.gz to a file named \"" + PACKAGES + "\" in this directory");
        }
        List<String> lines = Files.lines(Paths.get(PACKAGES)).collect(Collectors.toList());
        if (!Files.exists(Paths.get(INSTALLENDS))) {
            throw new Exception("Please create a text file named \"" + INSTALLENDS + "\" in this directory with the " +
                    "name of every package you want, perhaps copy-pasted from the output of apt");
        }
        List<String> installends = Files.lines(Paths.get(INSTALLENDS)).
                map(line -> Arrays.asList(line.split("(\\s|\\r|\\n)+"))).
                flatMap(Collection::stream).filter(installend -> !"".equals(installend)).
                collect(Collectors.toList());
        String folderName = "packages_" + System.currentTimeMillis();
        System.out.println("mkdir " + folderName);
        System.out.println("cd " + folderName);
        for (String installend : installends) {
            String url = getUrlForPackage(lines, installend);
            System.out.println("wget -q  \"" + url + "\"");
        }
    }

    private static String getUrlForPackage(List<String> lines, String packageName) throws Exception {
        int infoStart = lines.indexOf("Package: " + packageName);
        for (int i = infoStart; i < infoStart + 100 && i < lines.size(); i++) {
            String line = lines.get(i);
            if (line.startsWith("Filename: ")) {
                return URL_PREFIX + line.substring(10);
            }
        }
        throw new Exception("Couldn't find path to package " + packageName);
    }
}