<?php

/*
 *
 *  ____            _        _   __  __ _                  __  __ ____
 * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
 * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
 * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
 * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
 *
 * 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.
 *
 * @author PocketMine Team
 * @link http://www.pocketmine.net/
 *
 *
*/

declare(strict_types=1);

namespace pocketmine\command\defaults;

use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\lang\KnownTranslationFactory;
use pocketmine\lang\KnownTranslationKeys;
use pocketmine\permission\DefaultPermissionNames;
use pocketmine\utils\TextFormat;
use function array_chunk;
use function array_pop;
use function count;
use function explode;
use function implode;
use function is_numeric;
use function ksort;
use function min;
use function strtolower;
use const SORT_FLAG_CASE;
use const SORT_NATURAL;

class HelpCommand extends VanillaCommand{

	public function __construct(string $name){
		parent::__construct(
			$name,
			KnownTranslationKeys::POCKETMINE_COMMAND_HELP_DESCRIPTION,
			KnownTranslationKeys::COMMANDS_HELP_USAGE,
			["?"]
		);
		$this->setPermission(DefaultPermissionNames::COMMAND_HELP);
	}

	public function execute(CommandSender $sender, string $commandLabel, array $args){
		if(!$this->testPermission($sender)){
			return true;
		}

		if(count($args) === 0){
			$commandName = "";
			$pageNumber = 1;
		}elseif(is_numeric($args[count($args) - 1])){
			$pageNumber = (int) array_pop($args);
			if($pageNumber <= 0){
				$pageNumber = 1;
			}
			$commandName = implode(" ", $args);
		}else{
			$commandName = implode(" ", $args);
			$pageNumber = 1;
		}

		$pageHeight = $sender->getScreenLineHeight();

		if($commandName === ""){
			/** @var Command[][] $commands */
			$commands = [];
			foreach($sender->getServer()->getCommandMap()->getCommands() as $command){
				if($command->testPermissionSilent($sender)){
					$commands[$command->getName()] = $command;
				}
			}
			ksort($commands, SORT_NATURAL | SORT_FLAG_CASE);
			$commands = array_chunk($commands, $pageHeight);
			$pageNumber = min(count($commands), $pageNumber);
			if($pageNumber < 1){
				$pageNumber = 1;
			}
			$sender->sendMessage(KnownTranslationFactory::commands_help_header((string) $pageNumber, (string) count($commands)));
			$lang = $sender->getLanguage();
			if(isset($commands[$pageNumber - 1])){
				foreach($commands[$pageNumber - 1] as $command){
					$sender->sendMessage(TextFormat::DARK_GREEN . "/" . $command->getName() . ": " . TextFormat::WHITE . $lang->translateString($command->getDescription()));
				}
			}

			return true;
		}else{
			if(($cmd = $sender->getServer()->getCommandMap()->getCommand(strtolower($commandName))) instanceof Command){
				if($cmd->testPermissionSilent($sender)){
					$message = TextFormat::YELLOW . "--------- " . TextFormat::WHITE . " Help: /" . $cmd->getName() . TextFormat::YELLOW . " ---------\n";
					$message .= TextFormat::GOLD . "Description: " . TextFormat::WHITE . $sender->getLanguage()->translateString($cmd->getDescription()) . "\n";
					$message .= TextFormat::GOLD . "Usage: " . TextFormat::WHITE . implode("\n" . TextFormat::WHITE, explode("\n", $sender->getLanguage()->translateString($cmd->getUsage()))) . "\n";
					$sender->sendMessage($message);

					return true;
				}
			}
			$sender->sendMessage(TextFormat::RED . "No help for " . strtolower($commandName));

			return true;
		}
	}
}