package au.pfip;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Properties;

/**
 * Settings file (Java XML properties). The first of these that exists is used:
 * /etc/timekeeper.inf, ~/timekeeper.inf, ~/.config/timekeeper/timekeeper.inf,
 * ./timekeeper.inf. Run as root and keep the file in /etc: a settings file
 * the monitored user can edit defeats the monitoring.
 *
 * Changes: missing keys fall back to defaults (a missing key used to throw a
 * NullPointerException or silently disable the program), the settings file is
 * closed after reading, and the defaults written into a new file no longer
 * contain real user names or a network name.
 */
public class settings {

    private static final Properties settings = new Properties();
    private static final Map<String, String> defaults = new LinkedHashMap<>();
    private static String settingsFile;

    static {
        defaults.put("TimekeeperActive", "true");
        defaults.put("LogFilePath", System.getProperty("user.home"));
        // Comma separated list of the accounts to watch, e.g. "alice,bob". Must be set.
        defaults.put("UsersToMonitor", "");
        // Name of a network where enforcement is switched off. Empty means none.
        defaults.put("ExemptNetwork", "");
        defaults.put("GamesURL", "https://overlord.pfip.au/e107_plugins/timekeeper/timekeeperClientServices/games.json");
        defaults.put("PlaytimeURL", "https://overlord.pfip.au/e107_plugins/timekeeper/timekeeperClientServices/timer.php");
        // How many checks in a row may fail to reach the server before the game is closed (1 = close at once).
        defaults.put("OfflineChecksBeforeKill", "5");
        defaults.put("GamesRefreshMinutes", "60");
    }

    public static boolean initialiseSettings()
    {
        try {
            String[] paths = {"/etc/timekeeper.inf", System.getProperty("user.home") + "/timekeeper.inf", System.getProperty("user.home") + "/.config/timekeeper/timekeeper.inf", System.getProperty("user.dir") + "/timekeeper.inf"};

            for (String candidate : paths) {
                System.out.println("Checking for settings at " + candidate);
                Path path = Path.of(candidate);
                if (Files.exists(path)) {
                    System.out.println("Found settings at " + path);
                    settingsFile = String.valueOf(path);
                    try (InputStream in = Files.newInputStream(path)) {
                        settings.loadFromXML(in);
                    }
                    return true;
                }
            }

            Path path = Path.of(paths[2]);
            settingsFile = paths[2];
            Files.createDirectories(path.getParent());
            createSettingsFile();
            System.out.println("Settings file created at " + settingsFile + ". Set UsersToMonitor in it.");
            return true;
        } catch (IOException e) {
            //noinspection CallToPrintStackTrace
            e.printStackTrace();
            return false;
        }
    }

    private static void createSettingsFile()
    {
        for (Map.Entry<String, String> entry : defaults.entrySet()) {
            addSetting(entry.getKey(), entry.getValue());
        }
        saveSettingsFile();
    }

    public static void saveSettingsFile()
    {
        try (OutputStream out = Files.newOutputStream(Path.of(settingsFile))) {
            settings.storeToXML(out, "Timekeeper configuration file.");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public static void addSetting(String key, String val)
    {
        settings.setProperty(key, String.valueOf(val));
    }

    /**
     * A setting, or its default when the file doesn't have it. Never null.
     */
    public static String getSetting(String key)
    {
        String value = settings.getProperty(key);
        if (value == null) {
            value = defaults.get(key);
        }
        return value == null ? "" : value.trim();
    }

    public static int getInt(String key, int fallback)
    {
        try {
            return Integer.parseInt(getSetting(key));
        } catch (NumberFormatException e) {
            return fallback;
        }
    }

    /**
     * The folder the settings file lives in (also used for the games list cache).
     */
    public static Path getSettingsDirectory()
    {
        Path parent = (settingsFile == null) ? null : Path.of(settingsFile).toAbsolutePath().getParent();
        return parent != null ? parent : Path.of(System.getProperty("user.home"));
    }
}