/*
 * WorldEdit, a Minecraft world manipulation toolkit
 * Copyright (C) sk89q <http://www.sk89q.com>
 * Copyright (C) WorldEdit team and contributors
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser 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 Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.sk89q.worldedit.bukkit;

import com.sk89q.bukkit.util.CommandInspector;
import com.sk89q.worldedit.extension.platform.Actor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.enginehub.piston.CommandManager;
import org.enginehub.piston.CommandParameters;
import org.enginehub.piston.NoInputCommandParameters;
import org.enginehub.piston.inject.InjectedValueStore;
import org.enginehub.piston.inject.Key;
import org.enginehub.piston.inject.MapBackedValueStore;
import org.enginehub.piston.inject.MemoizingValueAccess;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Optional;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.sk89q.worldedit.bukkit.BukkitTextAdapter.reduceToText;

class BukkitCommandInspector implements CommandInspector {

    private static final Logger logger = LoggerFactory.getLogger(BukkitCommandInspector.class);
    private final WorldEditPlugin plugin;
    private final CommandManager dispatcher;

    BukkitCommandInspector(WorldEditPlugin plugin, CommandManager dispatcher) {
        checkNotNull(plugin);
        checkNotNull(dispatcher);
        this.plugin = plugin;
        this.dispatcher = dispatcher;
    }

    @Override
    public String getShortText(Command command) {
        Optional<org.enginehub.piston.Command> mapping = dispatcher.getCommand(command.getName());
        if (mapping.isPresent()) {
            return reduceToText(mapping.get().getDescription());
        } else {
            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
            return "Help text not available";
        }
    }

    @Override
    public String getFullText(Command command) {
        Optional<org.enginehub.piston.Command> mapping = dispatcher.getCommand(command.getName());
        if (mapping.isPresent()) {
            return reduceToText(mapping.get().getFullHelp());
        } else {
            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
            return "Help text not available";
        }
    }

    @Override
    public boolean testPermission(CommandSender sender, Command command) {
        Optional<org.enginehub.piston.Command> mapping = dispatcher.getCommand(command.getName());
        if (mapping.isPresent()) {
            InjectedValueStore store = MapBackedValueStore.create();
            store.injectValue(Key.of(Actor.class), context ->
                Optional.of(plugin.wrapCommandSender(sender)));
            CommandParameters parameters = NoInputCommandParameters.builder()
                .injectedValues(MemoizingValueAccess.wrap(store))
                .build();
            return mapping.get().getCondition().satisfied(parameters);
        } else {
            logger.warn("BukkitCommandInspector doesn't know how about the command '" + command + "'");
            return false;
        }
    }
}
