/* 
    This file is a part of the SteamWar software.
    
    Copyright (C) 2020  SteamWar.de-Serverteam

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

package de.steamwar.bausystem.commands;

import de.steamwar.bausystem.tracer.record.RecordStateMachine;
import de.steamwar.bausystem.tracer.record.RecordStatus;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.command.TabCompleter;
import org.bukkit.entity.Player;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.BiPredicate;

public class CommandTraceTabCompleter implements TabCompleter {

    private static List<TabComplete> tabCompletes = new ArrayList<>();

    static {
        tabCompletes.add(new TabComplete((player, args) -> args.length == 1 && (RecordStateMachine.getRecordStatus() == RecordStatus.IDLE || RecordStateMachine.getRecordStatus() == RecordStatus.IDLE_AUTO), "start"));
        tabCompletes.add(new TabComplete((player, args) -> args.length == 1 && (RecordStateMachine.getRecordStatus() != RecordStatus.IDLE && RecordStateMachine.getRecordStatus() != RecordStatus.IDLE_AUTO), "stop"));
        tabCompletes.add(new TabComplete((player, args) -> args.length == 1, "toggleauto", "auto", "show", "hide", "delete", "clear"));
        tabCompletes.add(new TabComplete((player, args) -> args.length == 2 && args[0].equalsIgnoreCase("show"), "nowater", "basic", "advanced", "advanced-nowater"));
    }

    @Override
    public List<String> onTabComplete(CommandSender sender, Command command, String label, String[] args) {
        if(!(sender instanceof Player)) return new ArrayList<>();
        return tracerTabComplete((Player) sender, args);
    }

    private List<String> tracerTabComplete(Player player, String[] args) {
        List<String> tabComplete = new ArrayList<>();
        for (TabComplete tab : tabCompletes) {
            if (tab.test(player, args)) tabComplete.addAll(Arrays.asList(tab.getTabCompletes()));
        }
        return manageList(tabComplete, args);
    }

    private List<String> manageList(List<String> strings, String[] args) {
        for (int i = strings.size() - 1; i >= 0; i--) {
            if (!strings.get(i).startsWith(args[args.length - 1])) strings.remove(i);
        }
        return strings;
    }

    private static class TabComplete {

        private BiPredicate<Player, String[]> function;
        private String[] tabCompletes;

        private TabComplete(BiPredicate<Player, String[]> function, String... tabCompletes) {
            this.function = function;
            this.tabCompletes = tabCompletes;
        }

        public boolean test(Player player, String[] args) {
            return function.test(player, args);
        }

        public String[] getTabCompletes() {
            return tabCompletes;
        }

    }

}