package me.bill.fakePlayerPlugin.command;

import me.bill.fakePlayerPlugin.config.Config;
import me.bill.fakePlayerPlugin.gui.HelpGui;
import me.bill.fakePlayerPlugin.lang.Lang;
import me.bill.fakePlayerPlugin.permission.Perm;
import me.bill.fakePlayerPlugin.util.TextUtil;
import net.kyori.adventure.text.Component;
import net.kyori.adventure.text.event.ClickEvent;
import net.kyori.adventure.text.event.HoverEvent;
import net.kyori.adventure.text.format.NamedTextColor;
import net.kyori.adventure.text.format.TextColor;
import net.kyori.adventure.text.format.TextDecoration;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

import java.util.List;

public class HelpCommand implements FppCommand {

  private static final int PAGE_SIZE = 6;
  private static final TextColor ACCENT = TextColor.fromHexString("#0079FF");

  private final CommandManager manager;

  private volatile HelpGui helpGui = null;
  private volatile String lastLabel = "fpp";

  public HelpCommand(CommandManager manager) {
    this.manager = manager;
  }

  public void setHelpGui(HelpGui gui) {
    this.helpGui = gui;
  }

  public void setLastLabel(String label) {
    this.lastLabel = label;
  }

  @Override
  public String getName() {
    return "help";
  }

  @Override
  public String getUsage() {
    return "[page]";
  }

  @Override
  public String getDescription() {
    return "Shows the command help menu.";
  }

  @Override
  public String getPermission() {
    return Perm.HELP;
  }

  @Override
  public boolean execute(CommandSender sender, String[] args) {

    if (sender instanceof Player player && helpGui != null && "gui".equals(Config.helpMode())) {
      helpGui.open(player, lastLabel);
      return true;
    }

    List<FppCommand> visible =
        manager.getCommands().stream().filter(cmd -> cmd.canUse(sender)).toList();

    int totalPages = Math.max(1, (int) Math.ceil(visible.size() / (double) PAGE_SIZE));

    int page = 1;
    if (args.length > 0) {
      try {
        page = Integer.parseInt(args[0]);
      } catch (NumberFormatException ignored) {
      }
    }
    page = Math.min(Math.max(page, 1), totalPages);

    sender.sendMessage(Lang.get("help-header"));
    sender.sendMessage(Component.empty());

    int from = (page - 1) * PAGE_SIZE;
    int to = Math.min(from + PAGE_SIZE, visible.size());

    for (FppCommand cmd : visible.subList(from, to)) {
      String usage = cmd.getUsage().isEmpty() ? "" : " " + cmd.getUsage();
      String raw =
          Lang.raw(
              "help-entry",
              "cmd",
              "fpp " + cmd.getName(),
              "args",
              usage,
              "desc",
              cmd.getDescription());
      sender.sendMessage(TextUtil.colorize(raw));
    }

    sender.sendMessage(Component.empty());
    sender.sendMessage(buildPaginationBar(page, totalPages));
    sender.sendMessage(Lang.get("help-footer"));
    return true;
  }

  private Component buildPaginationBar(int page, int totalPages) {

    Component prev;
    if (page > 1) {
      prev =
          Component.text("« ᴘʀᴇᴠ")
              .color(ACCENT)
              .decoration(TextDecoration.BOLD, true)
              .clickEvent(ClickEvent.runCommand("/fpp help " + (page - 1)))
              .hoverEvent(
                  HoverEvent.showText(
                      Component.text("Go to page " + (page - 1)).color(NamedTextColor.GRAY)));
    } else {
      prev =
          Component.text("« ᴘʀᴇᴠ")
              .color(NamedTextColor.DARK_GRAY)
              .decoration(TextDecoration.BOLD, true);
    }

    Component pageInfo =
        Component.text("  " + page + " / " + totalPages + "  ").color(NamedTextColor.WHITE);

    Component next;
    if (page < totalPages) {
      next =
          Component.text("ɴᴇxᴛ »")
              .color(ACCENT)
              .decoration(TextDecoration.BOLD, true)
              .clickEvent(ClickEvent.runCommand("/fpp help " + (page + 1)))
              .hoverEvent(
                  HoverEvent.showText(
                      Component.text("Go to page " + (page + 1)).color(NamedTextColor.GRAY)));
    } else {
      next =
          Component.text("ɴᴇxᴛ »")
              .color(NamedTextColor.DARK_GRAY)
              .decoration(TextDecoration.BOLD, true);
    }

    return Component.text(" ").append(prev).append(pageInfo).append(next);
  }
}