package de.gurkengewuerz.termbin;

import org.json.JSONArray;
import org.json.JSONObject;
import org.json.JSONTokener;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.file.AccessDeniedException;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Created by gurkengewuerz.de on 02.07.2017.
 */
public class Config extends JSONObject {
    private File file;
    private List<String> ban = new ArrayList<>();
    private List<String> whitelist = new ArrayList<>();

    private JSONObject uploadServerConf;
    private JSONObject dataServerConf;
    private JSONObject apiServerConf;

    public Config(File file) throws IOException {
        this.file = file;

        if (!file.exists()) {
            file.createNewFile();
        }

        if (!file.isFile()) {
            throw new FileNotFoundException(file.getAbsolutePath() + " not found");
        }

        if (!file.canRead() || !file.canWrite()) {
            throw new AccessDeniedException(file.getAbsolutePath() + " is not accessable");
        }

        this.put("accesslog", "access");
        this.put("database", "db.sqlite3");
        this.put("domain", "http://localhost/");
        this.put("uploadlifetime", 24 * 7); // 1 week hours
        this.put("maxkb", 1024 * 2); // 2 mb

        JSONObject uploadserver = new JSONObject();
        uploadserver.put("port", 8888);
        uploadserver.put("timeout", 5);
        uploadserver.put("bind", "0.0.0.0");
        this.put("uploadserver", uploadserver);

        JSONObject dataserver = new JSONObject();
        dataserver.put("port", 7070);
        this.put("dataserver", dataserver);

        JSONObject apiserver = new JSONObject();
        apiserver.put("port", 9090);
        this.put("apiserver", apiserver);

        JSONArray ban_list = new JSONArray();
        ban_list.put("125.38.39.40");
        ban_list.put("27.46.74.43");
        ban_list.put("210.35.171.4");
        this.put("ban_list", ban_list);

        JSONArray white_list = new JSONArray();
        white_list.put("127.0.0.1");
        white_list.put("192.168.1.36");
        this.put("white_list", white_list);
    }

    public void save() {
        try {
            FileWriter fw = new FileWriter(file.getAbsolutePath());
            fw.write(this.toString(4));
            fw.close();
            loadRestData();
        } catch (IOException e) {
            Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, e);
        }
    }

    public void load() {
        try {
            String content = new String(Files.readAllBytes(file.toPath()), "UTF-8");
            if (content.isEmpty()) {
                save();
                return;
            }
            JSONTokener jt = new JSONTokener(content);
            if (jt.nextClean() != 123) {
                throw jt.syntaxError("A JSONObject text must begin with '{'");
            } else {
                while (jt.more()) {
                    char c = jt.nextClean();
                    switch (c) {
                        case '\u0000':
                            throw jt.syntaxError("A JSONObject text must end with '}'");
                        case '}':
                            return;
                        default:
                            jt.back();
                            String key = jt.nextValue().toString();
                            c = jt.nextClean();
                            if (c != 58) {
                                throw jt.syntaxError("Expected a ':' after a key");
                            }

                            this.remove(key);
                            this.putOnce(key, jt.nextValue());
                            switch (jt.nextClean()) {
                                case ',':
                                case ';':
                                    if (jt.nextClean() == 125) {
                                        return;
                                    }

                                    jt.back();
                                    break;
                                case '}':
                                    save();
                                    return;
                                default:
                                    throw jt.syntaxError("Expected a ',' or '}'");
                            }
                    }
                }
            }
        } catch (IOException e) {
            Logger.getLogger(getClass().getName()).log(Level.SEVERE, null, e);
        }
    }

    private void loadRestData() {
        JSONArray json_whitelist = getJSONArray("white_list");
        for (int i = 0; i < json_whitelist.length(); i++) {
            whitelist.add(json_whitelist.getString(i));
        }

        JSONArray json_ban = getJSONArray("ban_list");
        for (int i = 0; i < json_ban.length(); i++) {
            if (whitelist.contains(json_ban.getString(i))) continue;
            ban.add(json_ban.getString(i));
        }

        uploadServerConf = getJSONObject("uploadserver");
        dataServerConf = getJSONObject("dataserver");
        apiServerConf = getJSONObject("apiserver");
    }

    public boolean isBanned(String ipv4) {
        return ban.contains(ipv4);
    }

    public List<String> getBans() {
        return ban;
    }

    public JSONObject getUploadServerConfig() {
        return uploadServerConf;
    }

    public JSONObject getDataServerConfig() {
        return dataServerConf;
    }

    public JSONObject getApiServerConfig() {
        return apiServerConf;
    }
}