/*
 * This file is part of PlaceholderAPI
 *
 * PlaceholderAPI
 * Copyright (c) 2015 - 2020 PlaceholderAPI Team
 *
 * PlaceholderAPI free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlaceholderAPI 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package me.clip.placeholderapi.commands;

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;
import me.clip.placeholderapi.PlaceholderAPIPlugin;
import org.bukkit.command.CommandSender;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.annotations.Unmodifiable;

import java.util.List;
import java.util.Set;
import java.util.stream.Stream;

public abstract class PlaceholderCommand
{

	@NotNull
	private final String      label;
	@NotNull
	private final Set<String> alias;

	@Nullable
	private String permission;


	protected PlaceholderCommand(@NotNull final String label, @NotNull final String... alias)
	{
		this.label = label;
		this.alias = Sets.newHashSet(alias);

		setPermission("placeholderapi." + label);
	}


	@NotNull
	public final String getLabel()
	{
		return label;
	}

	@NotNull
	@Unmodifiable
	public final Set<String> getAlias()
	{
		return ImmutableSet.copyOf(alias);
	}

	@NotNull
	@Unmodifiable
	public final Set<String> getLabels()
	{
		return ImmutableSet.<String>builder().add(label).addAll(alias).build();
	}


	@Nullable
	public final String getPermission()
	{
		return permission;
	}

	public void setPermission(@NotNull final String permission)
	{
		this.permission = permission;
	}


	public void evaluate(@NotNull final PlaceholderAPIPlugin plugin, @NotNull final CommandSender sender, @NotNull final String alias, @NotNull @Unmodifiable final List<String> params)
	{

	}

	public void complete(@NotNull final PlaceholderAPIPlugin plugin, @NotNull final CommandSender sender, @NotNull final String alias, @NotNull @Unmodifiable final List<String> params, @NotNull final List<String> suggestions)
	{

	}


	@NotNull
	public static Stream<PlaceholderCommand> filterByPermission(@NotNull final CommandSender sender, @NotNull final Stream<PlaceholderCommand> commands)
	{
		return commands.filter(target -> target.getPermission() == null || sender.hasPermission(target.getPermission()));
	}

	public static void suggestByParameter(@NotNull final Stream<String> possible, @NotNull final List<String> suggestions, @Nullable final String parameter)
	{
		if (parameter == null)
		{
			possible.forEach(suggestions::add);
		}
		else
		{
			possible.filter(suggestion -> suggestion.toLowerCase().startsWith(parameter.toLowerCase())).forEach(suggestions::add);
		}
	}

}