package net.knarcraft.blacksmith.command.scrapper;

import net.knarcraft.blacksmith.config.scrapper.ScrapperSetting;
import net.knarcraft.blacksmith.util.TabCompleteValuesHelper;
import net.knarcraft.knarlib.util.TabCompletionHelper;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabCompleter;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.ArrayList;
import java.util.List;

/**
 * The tab completer for the scrapper editing command
 */
public class ScrapperEditTabCompleter implements TabCompleter {

    @Override
    public @Nullable List<String> onTabComplete(@NotNull CommandSender sender, @NotNull Command command,
                                                @NotNull String s, @NotNull String[] args) {
        if (!sender.hasPermission("blacksmith.edit")) {
            return new ArrayList<>();
        }

        List<String> npcSettings = new ArrayList<>();
        for (ScrapperSetting setting : ScrapperSetting.values()) {
            if (setting.isPerNPC()) {
                npcSettings.add(setting.getCommandName());
            }
        }

        if (args.length == 1) {
            return TabCompletionHelper.filterMatchingContains(npcSettings, args[0]);
        } else {
            if (npcSettings.contains(args[0]) && args.length == 2) {
                return tabCompleteCommandValues(args[0], args[1]);
            } else {
                return new ArrayList<>();
            }
        }
    }

    /**
     * Tab completes the values available for the given command
     *
     * @param commandName  <p>The name of the used command</p>
     * @param commandValue <p>The command value used to filter tab-completions</p>
     * @return <p>Some valid options for the command's argument</p>
     */
    private @Nullable List<String> tabCompleteCommandValues(@NotNull String commandName, @NotNull String commandValue) {
        ScrapperSetting setting = ScrapperSetting.getSetting(commandName);
        if (setting != null) {
            return TabCompletionHelper.filterMatchingContains(TabCompleteValuesHelper.getTabCompletions(
                    setting.getValueType()), commandValue);
        } else {
            return null;
        }
    }

}