<?php
namespace App\Controller;

error_reporting(error_level: E_ALL);


use PDO;
use PDOException;

/**
 *
 */
class DatabaseConnection
{
	private PDO $dbConnection;
	
	const TABLE_PREFIX = '';
	const TABLE_DOMAINS = self::TABLE_PREFIX . "domains";
	const TABLE_NAMESERVERS = self::TABLE_PREFIX . "nameservers";
	const TABLE_PANELS = self::TABLE_PREFIX . "panels";
	const TABLE_APIKEYS = self::TABLE_PREFIX . "apikeys";
	const TABLE_DYNDNS = self::TABLE_PREFIX . "dyndns";
	
	public function __construct(private array $config)
	{
		extract(array: $this->config);
		// TODO create config => encryption key
		try {
			$this->dbConnection = new PDO(
				dsn: "mysql:host=$dbHost;port=$dbPort;charset=utf8mb4;dbname=$dbDatabase",
				username: $dbUser,
				password: $dbPassword
			);
			$sql = "SHOW TABLES";
			$statement = $this->dbConnection->prepare(query: $sql);
			$statement->execute();
			$result = $statement->fetch();
			if (empty($result)) {
				// ALTER TABLE `domains` ADD `panel_id` INT NULL AFTER `id`;
				echo 'Error: Cannot find tables.' . PHP_EOL;
				if (confirm(message: 'Should I try to create them?')) {
					$sql = "
						CREATE TABLE `apikeys` (
	                        `id` int(11) NOT NULL AUTO_INCREMENT,
	                        `name` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
	                        `api_token_prefix` varchar(13) COLLATE utf8mb4_unicode_ci NOT NULL,
	                        `api_token` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
	                        PRIMARY KEY (`id`)
						) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
					$statement = $this->dbConnection->prepare(query: $sql);
					$statement->execute();
					
					$sql = "
						CREATE TABLE `domains` (
							`id` int(11) NOT NULL AUTO_INCREMENT,
							`name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
  							`panel` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
							PRIMARY KEY (`id`)
						) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
					$statement = $this->dbConnection->prepare(query: $sql);
					$statement->execute();
					
					$sql = "
						CREATE TABLE `nameservers` (
							`id` int(11) NOT NULL AUTO_INCREMENT,
							`name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
							`a` varbinary(255) DEFAULT NULL,
							`aaaa` varbinary(255) DEFAULT NULL,
							`apikey` varbinary(255) DEFAULT NULL,
							PRIMARY KEY (`id`)
						) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
					$statement = $this->dbConnection->prepare(query: $sql);
					$statement->execute();
					
					$sql = "
						CREATE TABLE `panels` (
							`id` int(11) NOT NULL AUTO_INCREMENT,
							`name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
							`a` varbinary(255) DEFAULT NULL,
							`aaaa` varbinary(255) DEFAULT NULL,
							`apikey` varbinary(255) DEFAULT NULL,
							PRIMARY KEY (`id`)
						) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
					$statement = $this->dbConnection->prepare(query: $sql);
					$statement->execute();
					
					$sql = "
						CREATE TABLE `dyndns` (
							`id` int(11) NOT NULL AUTO_INCREMENT,
							`name` VARCHAR(255) NOT NULL,
							`a` VARBINARY(255) NOT NULL,
							`aaaa` VARBINARY(255) NOT NULL,
							`last_update` TIMESTAMP NOT NULL,
							PRIMARY KEY (`id`)
						) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci";
					
					$statement = $this->dbConnection->prepare(query: $sql);
					$statement->execute();
					
					echo 'Tables have been created.' . PHP_EOL;
				}
				exit(1);
			}

		} catch (PDOException $exception) {
			echo $exception->getMessage() . PHP_EOL;
			echo 'Did you create the database and adjust the config file?' . PHP_EOL;
			echo PHP_EOL . 'You can create database an user via a panel or manually in mysql shell:' . PHP_EOL;
			$password = $this->generatePassword();
			echo 'Created an initial password: ' . $password . PHP_EOL;
			echo 'CREATE DATABASE bindAPI;' . PHP_EOL;
			echo "CREATE USER 'bindAPI'@'localhost' IDENTIFIED BY '$password';" . PHP_EOL;
			echo "GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, INDEX, DROP, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES ON bindAPI.* TO 'bindAPI'@'localhost';" . PHP_EOL;
			echo 'There is no need to run FLUSH PRIVILEGES when using GRANT!' . PHP_EOL;
			exit(1);
		}
	}
	
	
	/**
	 * @param int $length
	 *
	 * @return string
	 */
	function generatePassword(int $length = 8): string
	{
		$chars = '23456789bcdfhkmnprstvzBCDFHJKLMNPRSTVZ';
		$shuffled = str_shuffle(string: $chars);
		return mb_substr(string: $shuffled, start: 0, length: $length);
	}
	
	/**
	 * @return \PDO
	 */
	public function getConnection(): PDO
	{
		return $this->dbConnection;
	}
}