/*
 *
 * PlaceholderAPI
 * Copyright (C) 2019 Ryan McCarthy
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */
package me.clip.placeholderapi;

import me.clip.placeholderapi.commands.PlaceholderAPICommands;
import me.clip.placeholderapi.configuration.PlaceholderAPIConfig;
import me.clip.placeholderapi.expansion.ExpansionManager;
import me.clip.placeholderapi.expansion.PlaceholderExpansion;
import me.clip.placeholderapi.expansion.Version;
import me.clip.placeholderapi.expansion.cloud.ExpansionCloudManager;
import me.clip.placeholderapi.external.EZPlaceholderHook;
import me.clip.placeholderapi.updatechecker.UpdateChecker;
import me.clip.placeholderapi.util.TimeUtil;
import org.bstats.bukkit.Metrics;
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.command.CommandSender;
import org.bukkit.plugin.java.JavaPlugin;

import java.text.SimpleDateFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;


/**
 * Yes I have a shit load of work to do...
 *
 * @author Ryan McCarthy
 */
public class PlaceholderAPIPlugin extends JavaPlugin {

  private static PlaceholderAPIPlugin instance;
  private static SimpleDateFormat dateFormat;
  private static String booleanTrue;
  private static String booleanFalse;
  private static Version serverVersion;
  private PlaceholderAPIConfig config;
  private ExpansionManager expansionManager;
  private ExpansionCloudManager expansionCloud;
  private long startTime;

  private static Version getVersion() {
    String v = "unknown";
    boolean spigot = false;

    try {
      v = Bukkit.getServer().getClass().getPackage().getName()
          .split("\\.")[3];
    } catch (ArrayIndexOutOfBoundsException ex) {
    }

    try {
      Class.forName("org.spigotmc.SpigotConfig");
      Class.forName("net.md_5.bungee.api.chat.BaseComponent");
      spigot = true;
    } catch (ExceptionInInitializerError | ClassNotFoundException ignored) {
    }

    return new Version(v, spigot);
  }

  /**
   * Gets the static instance of the main class for PlaceholderAPI. This class is not the actual API
   * class, this is the main class that extends JavaPlugin. For most API methods, use static methods
   * available from the class: {@link PlaceholderAPI}
   *
   * @return PlaceholderAPIPlugin instance
   */
  public static PlaceholderAPIPlugin getInstance() {
    return instance;
  }

  /**
   * Get the configurable {@linkplain SimpleDateFormat} object that is used to parse time for
   * generic time based placeholders
   *
   * @return date format
   */
  public static SimpleDateFormat getDateFormat() {
    return dateFormat != null ? dateFormat : new SimpleDateFormat(
        "MM/dd/yy HH:mm:ss");
  }

  /**
   * Get the configurable {@linkplain String} value that should be returned when a boolean is true
   *
   * @return string value of true
   */
  public static String booleanTrue() {
    return booleanTrue != null ? booleanTrue : "true";
  }

  /**
   * Get the configurable {@linkplain String} value that should be returned when a boolean is false
   *
   * @return string value of false
   */
  public static String booleanFalse() {
    return booleanFalse != null ? booleanFalse : "false";
  }

  public static Version getServerVersion() {
    return serverVersion != null ? serverVersion : getVersion();
  }

  @Override
  public void onLoad() {
    startTime = System.currentTimeMillis();
    instance = this;
    serverVersion = getVersion();
    config = new PlaceholderAPIConfig(this);
    expansionManager = new ExpansionManager(this);
  }

  @Override
  public void onEnable() {
    config.loadDefConfig();
    setupOptions();

    getCommand("placeholderapi").setExecutor(new PlaceholderAPICommands(this));
    new PlaceholderListener(this);

    try {
      Class.forName("org.bukkit.event.server.ServerLoadEvent");
      new ServerLoadEventListener(this);
    } catch (ExceptionInInitializerError | ClassNotFoundException exception) {
      Bukkit.getScheduler().runTaskLater(this, () -> {
        getLogger().info("Placeholder expansion registration initializing...");

        //fetch any hooks that may have registered externally onEnable first otherwise they will be lost
        final Map<String, PlaceholderHook> alreadyRegistered = PlaceholderAPI.getPlaceholders();
        getExpansionManager().registerAllExpansions();

        if (alreadyRegistered != null && !alreadyRegistered.isEmpty()) {
          alreadyRegistered.forEach(PlaceholderAPI::registerPlaceholderHook);
        }
      }, 1);
    }

    if (config.checkUpdates()) {
      new UpdateChecker(this).fetch();
    }

    if (config.isCloudEnabled()) {
      enableCloud();
    }

    setupMetrics();
    getServer().getScheduler().runTaskLater(this, this::checkHook, 40);
  }

  @Override
  public void onDisable() {
    disableCloud();
    PlaceholderAPI.unregisterAll();
    expansionManager = null;
    Bukkit.getScheduler().cancelTasks(this);
    serverVersion = null;
    instance = null;
  }

  public void reloadConf(CommandSender s) {
    boolean cloudEnabled = this.expansionCloud != null;
    PlaceholderAPI.unregisterAllProvidedExpansions();
    reloadConfig();
    setupOptions();
    expansionManager.registerAllExpansions();

    if (!config.isCloudEnabled()) {
      disableCloud();
    } else if (!cloudEnabled) {
      enableCloud();
    }

    s.sendMessage(ChatColor.translateAlternateColorCodes('&',
        PlaceholderAPI.getRegisteredIdentifiers().size()
            + " &aplaceholder hooks successfully registered!"));
  }

  private void checkHook() {
    Map<String, PlaceholderHook> loaded = PlaceholderAPI.getPlaceholders();

    loaded.values().forEach(h -> {
      if (h instanceof EZPlaceholderHook) {
        String author;

        try {
          author = Bukkit.getPluginManager().getPlugin(((EZPlaceholderHook) h).getPluginName()).getDescription().getAuthors().toString();
        } catch (Exception ex) {
          author = "the author of the hook's plugin";
        }

        getLogger().severe(((EZPlaceholderHook) h).getPluginName() +
                " is currently using a deprecated method to hook into PlaceholderAPI. Placeholders for that plugin no longer work. " +
                "Please consult {author} and urge them to update it ASAP.".replace("{author}", author));

        // disable the hook on startup
        PlaceholderAPI.unregisterPlaceholderHook(((EZPlaceholderHook) h).getPlaceholderName());
      }
    });
  }

  private void setupOptions() {
    booleanTrue = config.booleanTrue();

    if (booleanTrue == null) {
      booleanTrue = "true";
    }

    booleanFalse = config.booleanFalse();

    if (booleanFalse == null) {
      booleanFalse = "false";
    }

    try {
      dateFormat = new SimpleDateFormat(config.dateFormat());
    } catch (Exception e) {
      dateFormat = new SimpleDateFormat("MM/dd/yy HH:mm:ss");
    }
  }

  private void setupMetrics() {
    Metrics m = new Metrics(this);
    m.addCustomChart(new Metrics.SimplePie("using_expansion_cloud",
        () -> getExpansionCloud() != null ? "yes" : "no"));

    m.addCustomChart(
        new Metrics.SimplePie("using_spigot", () -> getServerVersion().isSpigot() ? "yes" : "no"));

    m.addCustomChart(new Metrics.AdvancedPie("expansions_used", () -> {
      Map<String, Integer> map = new HashMap<>();
      Map<String, PlaceholderHook> p = PlaceholderAPI.getPlaceholders();

      if (!p.isEmpty()) {

        for (PlaceholderHook hook : p.values()) {
          if (hook instanceof PlaceholderExpansion) {
            PlaceholderExpansion ex = (PlaceholderExpansion) hook;
            map.put(ex.getRequiredPlugin() == null ? ex.getIdentifier()
                : ex.getRequiredPlugin(), 1);
          }
        }
      }
      return map;

    }));

  }

  public void enableCloud() {
    if (expansionCloud == null) {
      expansionCloud = new ExpansionCloudManager(this);
    } else {
      expansionCloud.clean();
    }
    expansionCloud.fetch(config.cloudAllowUnverifiedExpansions());
  }

  public void disableCloud() {
    if (expansionCloud != null) {
      expansionCloud.clean();
      expansionCloud = null;
    }
  }

  /**
   * Obtain the configuration class for PlaceholderAPI.
   *
   * @return PlaceholderAPIConfig instance
   */
  public PlaceholderAPIConfig getPlaceholderAPIConfig() {
    return config;
  }

  public ExpansionManager getExpansionManager() {
    return expansionManager;
  }

  public ExpansionCloudManager getExpansionCloud() {
    return expansionCloud;
  }

  public String getUptime() {
    return TimeUtil
        .getTime((int) TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis() - startTime));
  }

  public long getUptimeMillis() {
    return (System.currentTimeMillis() - startTime);
  }
}