/*
 * 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.command;

import de.steamwar.bungeecore.BungeeCore;
import de.steamwar.bungeecore.Message;
import de.steamwar.messages.ChatSender;
import net.md_5.bungee.BungeeCord;
import net.md_5.bungee.api.CommandSender;
import net.md_5.bungee.api.chat.ClickEvent;
import net.md_5.bungee.api.connection.ProxiedPlayer;
import net.md_5.bungee.api.plugin.Command;
import net.md_5.bungee.api.plugin.TabExecutor;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import java.util.logging.Level;

public class SWCommand extends AbstractSWCommand<CommandSender> {

    static {
        TypeUtils.init();
    }

    private String permission;
    private Command command;

    private List<String> defaultHelpMessages = new ArrayList<>();

    protected SWCommand(String command) {
        this(command, null);
    }

    protected SWCommand(String command, String permission) {
        this(command, permission, new String[0]);
    }

    protected SWCommand(String command, String permission, String... aliases) {
        super(CommandSender.class, command, aliases);
        this.permission = permission;
        create = true;
        createAndSafeCommand(command, aliases);
        unregister();
        register();
    }

    private boolean create = false;

    @Override
    protected void createAndSafeCommand(String command, String[] aliases) {
        if (!create) return;
        this.command = new TabCompletableCommand(command, permission, aliases) {
            @Override
            public void execute(CommandSender commandSender, String[] strings) {
                SWCommand.this.execute(commandSender, null, strings);
            }

            @Override
            public Iterable<String> onTabComplete(CommandSender commandSender, String[] strings) {
                return SWCommand.this.tabComplete(commandSender, null, strings);
            }
        };
    }

    private abstract static class TabCompletableCommand extends Command implements TabExecutor {
        public TabCompletableCommand(String name, String permission, String... aliases) {
            super(name, permission, aliases);
        }
    }

    @Override
    public void unregister() {
        if (command == null) return;
        CommandRegistering.unregister(this.command);
    }

    @Override
    public void register() {
        if (command == null) return;
        CommandRegistering.register(this.command);
    }

    @Override
    protected void commandSystemError(CommandSender sender, CommandFrameworkException e) {
        BungeeCore.get().getLogger().log(Level.SEVERE, e.getMessage(), e);
        ChatSender.of(sender).prefixless("COMMAND_SYSTEM_ERROR");
    }

    @Override
    protected void commandSystemWarning(Supplier<String> message) {
        BungeeCore.get().getLogger().log(Level.WARNING, message);
    }

    public void addDefaultHelpMessage(String message) {
        defaultHelpMessages.add(message);
    }

    @Override
    protected void sendMessage(CommandSender sender, String message, Object[] args) {
        ChatSender.of(sender).system(message, args);
    }

    @Register(help = true)
    private void internalHelp(ProxiedPlayer p, String... args) {
        ChatSender chatSender = ChatSender.of(p);
        try {
            chatSender.prefixless("COMMAND_HELP_HEAD", command.getName());
            defaultHelpMessages.forEach(chatSender::prefixless);
        } catch (Exception e) {
            BungeeCore.get().getLogger().log(Level.WARNING, "Failed to send help message", e);
            return;
        }
        AtomicInteger atomicInteger = new AtomicInteger();
        if (args.length != 0) {
            commandList.forEach(subCommand -> {
                List<String> tabCompletes = subCommand.tabComplete(p, args);
                if (tabCompletes == null || tabCompletes.isEmpty()) {
                    atomicInteger.incrementAndGet();
                    return;
                }
                boolean hasTabCompletes = tabCompletes.stream()
                        .anyMatch(s -> s.toLowerCase().startsWith(args[args.length - 1].toLowerCase()));
                if (hasTabCompletes) {
                    send(chatSender, subCommand);
                } else {
                    atomicInteger.incrementAndGet();
                }
            });
        }
        if (args.length == 0 || atomicInteger.get() == commandList.size()) {
            commandList.forEach(subCommand -> {
                if (subCommand.guardChecker == null || subCommand.guardChecker.guard(p, GuardCheckType.TAB_COMPLETE, new String[0], null) == GuardResult.ALLOWED) {
                    send(chatSender, subCommand);
                }
            });
        }
    }

    private void send(ChatSender chatSender, SubCommand<CommandSender> subCommand) {
        try {
            for (String s : subCommand.description) {
                String hover = "§8/§e" + command.getName() + " " + String.join(" ", subCommand.subCommand);
                String suggest = "/" + command.getName() + " " + String.join(" ", subCommand.subCommand);
                chatSender.prefixless(s, new Message("PLAIN_STRING", hover), new ClickEvent(ClickEvent.Action.SUGGEST_COMMAND, suggest));
            }
        } catch (Exception e) {
            BungeeCore.get().getLogger().log(Level.WARNING, "Failed to send description of registered method '" + subCommand.method + "' with description '" + subCommand.description + "'", e);
        }
    }
}