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package net.pulchraprospectus.installer;

import java.util.Map;
import java.util.zip.ZipFile;
import java.util.zip.ZipEntry;
import java.io.File;
import java.io.FileOutputStream;
import java.io.StringWriter;
import java.io.InputStreamReader;
import java.net.URLConnection;
import java.net.URI;
import org.json.JSONObject;
import org.json.JSONArray;
import org.json.JSONException;

public class Installer {
    public static void main (String[] args) {
        URLConnection con = new URI("https://pulchraprospectus.net/versions/current").toURL().openConnection();
        con.connect();
        File mcWin = new File(System.getProperty("user.home") + "\\AppData\\Roaming\\.minecraft");
        File mcMac = new File(System.getProperty("user.home") + "/Library/Application Support/minecraft");
        File mcLin = new File(System.getProperty("user.home") + ".minecraft");
        File mc = getArchFile(mcWin, mcMac, mcLin);
        File pp = new File(mc, "pp.zip");
        if (!pp.exists()) pp.createNewFile();
        FileOutputStream out = new FileOutputStream(pp);
        con.getInputStream().transferTo(out);
        ZipFile f = new ZipFile(pp);
        ZipEntry entry = null;
        f.stream().forEach((candidate) -> { if (candidate.getName().endsWith("pointers.json") && entry != null) entry = candidate; });
        if (entry == null) throw new NullPointerException("No pointers.json file found");
        StringWriter sw = new StringWriter();
        new InputStreamReader(f.getInputStream(entry)).transferTo(sw);
        copyFiles(mc, f, readPointers(new JSONObject(sw.toString())));
        pp.delete();
    }

    public static File getArchFile (File win, File mac, File linux) {
        switch (System.getProperty("os.arch")) {
            case "windows":
                return win;
                break;
            case "osx":
                return mac;
                break;
            case "linux":
                return linux;
                break;
            default:
                return null;
        }
    }

    public static Map<String, String> readPointers (JSONObject j) {
        try {
            Map<String, String> pointers = Map.<String, String>of();
            JSONArray pointerarray = j.getJSONArray("pointers");
            for (Object o : pointerarray)
                if (o instanceof JSONObject)
                    pointers.put(((JSONObject)o).keySet().get(0), ((JSONObject)o).getString(((JSONObject)o).keySet().get(0)));
            return pointers;
        } catch (JSONException je) {
            throw new MalformedPointerFileException("Pointers malformed", je);
        }
    }

    public static void copyFiles(File src, ZipFile z, Map<String, String> pointers) {
        for (String s : pointers.keySet()) {
            File f = new File(src, pointers.get(s));
            if (!f.exists()) f.createNewFile();
            ZipEntry entry = null;
            z.stream().forEach((candidate) -> { if (candidate.getName.endsWith(s) && entry == null) entry = candidate; });
            if (entry == null) throw new MalformedPointerFileException("No associated file for pointer " + s);
            FileOutputStream stream = new FileOutputStream(f);
            z.getInputStream(entry).transferTo(stream);
        }
    }
}