<?php

namespace App\Controller;

use PDO;
use PDOException;

/**
 *
 */
class DomainController
{
	private String $localZoneFile;
	private String $localZonesDir;
	private String $namedConfLocalFile;
	private string $zoneCachePath;
	
	public function __construct(private DatabaseConnection $databaseConnection, private PanelController $panelController)
	{
		$this->localZoneFile = '/etc/bind/local.zones';
		$this->localZonesDir = '/etc/bind/zones/';
		$this->namedConfLocalFile = '/etc/bind/named.conf.local';
		$this->zoneCachePath = '/var/cache/bind/';
	}
	
	
	/**
	 * @return array|false
	 */
	public function findAll(): bool|array
	{
		$statement = "
            SELECT id, name, panel_id, a, aaaa
            FROM " . DatabaseConnection::TABLE_DOMAINS . "
            ORDER BY name";
		
		try {
			$statement = $this->databaseConnection->getConnection()->query($statement);
			return $statement->fetchAll(mode: PDO::FETCH_ASSOC);
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	
	/**
	 * @param String $name
	 *
	 * @return array|false
	 */
	public function findByName(String $name): bool|array
	{
		$sql = "
			SELECT id, name, panel_id, a, aaaa
			FROM " . DatabaseConnection::TABLE_DOMAINS . "
            WHERE name = :name";
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($sql);
			$statement->bindParam(param: ':name', var: $name);
			$statement->execute();
			return $statement->fetch(PDO::FETCH_ASSOC);
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	
	/**
	 * @param int $id
	 *
	 * @return array|false
	 */
	public function findByID(int $id): bool|array
	{
		$sql = "
			SELECT id, name, panel_id, a, aaaa
			FROM . " . DatabaseConnection::TABLE_DOMAINS . "
            WHERE id = :id";
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($sql);
			$statement->bindParam(param:':id', var: $id);
			$statement->execute();
			return $statement->fetch(PDO::FETCH_ASSOC);
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	
	/**
	 * @param String $name
	 * @param int    $panelID
	 * @param String $a
	 * @param String $aaaa
	 *
	 * @return int
	 */
	public function insert(String $name, int $panelID, String $a, String $aaaa): int
	{
		// TODO create zone file and include
		$sql = "
            INSERT INTO " . DatabaseConnection::TABLE_DOMAINS . " (name, panel_id, a, aaaa)
            VALUES (:name, :panel_id, :a, :aaaa)";
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($sql);
			$statement->bindParam(param: ':name', var: $name);
			$statement->bindParam(param: ':panel_d', var: $panelID);
			$statement->bindParam(param: ':a', var: $a);
			$statement->bindParam(param: ':aaaa', var: $aaaa);
			$statement->execute();
			
			
			if ($panel = $this->panelController->findByID($panelID)) {
				$a = $panel['a'];
				$aaaa = $panel['aaaa'];
			}
			$this->createZoneFile(name: $name, a: $a, aaaa: $aaaa);
			$zoneFilename = $this->localZonesDir . $name;
			echo $zoneFilename . PHP_EOL;
			
			if ($localZones = fopen($this->localZoneFile, mode: 'a')) {
				fputs($localZones, data: "include \"$zoneFilename\";" . PHP_EOL);
				fclose($localZones);
			} else {
				echo "Error writing to $this->localZoneFile, check permissions";
				exit(1);
			}
			
			return $this->databaseConnection->getConnection()->lastInsertId();
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	
	/**
	 * @param Int    $id
	 * @param String $name
	 * @param int    $panelID
	 * @param String $a
	 * @param String $aaaa
	 *
	 * @return false|int
	 */
	public function update(Int $id, String $name, int $panelID, String $a, String $aaaa): bool|int
	{
		$current = $this->findByID($id);
		
		/* doesn't work
		$statement = "
            INSERT INTO domains(id, name, a, aaaa)
            VALUES(:id, :name, :a, :aaaa)
            ON DUPLICATE KEY UPDATE
            	name=COALESCE(VALUES(name), :name),
				a=COALESCE(:a, a),
            	aaaa=COALESCE(:aaaa, aaaa)";
		*/
		
		if (empty($name)) {
			$name = $current['name'];
		}
		if (empty($panelID)) {
			$panelID = $current['panel_id'];
		}
		$panelID = intval(value: $panelID);
		if (empty($a)) {
			$a = $current['a'];
		}
		if (empty($aaaa)) {
			$aaaa = $current['aaaa'];
		}
		
		$sql = "
			UPDATE " . DatabaseConnection::TABLE_DOMAINS . " SET
				name = :name,
				panel_id = :panel_id,
				a = :a,
               	aaaa = :aaaa
            WHERE id = :id";
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($sql);
			$statement->bindParam(param: 'id', var: $id);
			$statement->bindParam(param: 'name', var: $name);
			$statement->bindParam(param: 'panel_id', var: $panelID);
			$statement->bindParam(param: 'a', var: $a);
			$statement->bindParam(param: 'aaaa', var: $aaaa);
			$statement->execute();
			
			// recreate zonefile
			if ($panel = $this->panelController->findByID($panelID)) {
				$a = $panel['a'];
				$aaaa = $panel['aaaa'];
			}
			$this->createZoneFile(name: $name, a: $a, aaaa: $aaaa);
			exec(command: '/usr/sbin/rndc reload');

			return $statement->rowCount();
		} catch (PDOException $e) {
			print($e->getMessage());
			return false;
		}
	}
	
	
	/**
	 * @param $id
	 *
	 * @return int
	 */
	public function delete($id): int
	{
		// TODO delete zone file and include
		$statement = "
            DELETE FROM " . DatabaseConnection::TABLE_DOMAINS . "
            WHERE id = :id";
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($statement);
			$statement->bindParam(param: 'id', var: $id);
			$statement->execute();
			return $statement->rowCount();
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	/**
	 * @param String $field
	 *
	 * @return int
	 */
	public function getLongestEntry(String $field): int
	{
		$statement = "
            SELECT MAX(LENGTH(" . $field . ")) as length FROM " . DatabaseConnection::TABLE_DOMAINS;
		
		try {
			$statement = $this->databaseConnection->getConnection()->prepare($statement);
			$statement->execute();
			$result =  $statement->fetch();
			return $result['length'];
		} catch (PDOException $e) {
			exit($e->getMessage());
		}
	}
	
	/**
	 * @return void
	 */
	function checkPermissions(): void
	{
		echo 'Checking permission:' . PHP_EOL . PHP_EOL;
		$uid = posix_geteuid();
		print("UID:\t$uid" . PHP_EOL);
		
		$pwuid = posix_getpwuid($uid);
		$name = $pwuid['name'];
		print("Name:\t$name" . PHP_EOL);
		$bindGroup = posix_getgrnam(name: 'bind');
		$members = $bindGroup['members'];
		if (in_array(needle: $name, haystack: $members)) {
				echo "\t✅ is in group 'bind" . PHP_EOL;
		}

		echo 'Checking file: ' .$this->localZoneFile . PHP_EOL;
		$localZoneFilePermissions = fileperms(filename: $this->localZoneFile);
		if ($localZoneFilePermissions & 0x0010) {
			echo "\t✅ Group has write access." . PHP_EOL;
		} else {
			echo "\t❌Group needs write permission!" . PHP_EOL;
		}
		
		echo "Checking $this->namedConfLocalFile" . PHP_EOL;
		if ($namedConfLocal = file_get_contents($this->namedConfLocalFile)) {
			if (!str_contains($namedConfLocal, $this->localZoneFile)) {
				echo "\t❌ $this->localZoneFile needs to be included in $this->namedConfLocalFile." . PHP_EOL;
			} else {
				echo "\t✅ $this->localZoneFile is included in $this->namedConfLocalFile" . PHP_EOL;
			}
		} else {
			echo "\t❌ No access to '$this->namedConfLocalFile'. Please check permissions" . PHP_EOL;
		}
		
		echo 'Checking directory: ' . $this->localZonesDir . PHP_EOL;
		$localZoneDirPermissions = fileperms(filename: $this->localZonesDir);
		if ($localZoneDirPermissions & 0x0010) {
			echo "\t✅ Group has write access." . PHP_EOL;
		} else {
			echo "\t❌Group needs write permission!" . PHP_EOL;
		}
	}
	
	
	/**
	 * @return array|bool
	 */
	function checkDomains(): array|bool
	{
		$domains = $this->findAll();
		
		if ($namedConfLocal = file_get_contents($this->namedConfLocalFile)) {
			if (!str_contains($namedConfLocal, $this->localZoneFile)) {
				return "$this->localZoneFile needs to be included in $this->namedConfLocalFile.";
			}
		} else {
			return "No access to '$this->namedConfLocalFile'. Please check permissions";
		}
		
		if (!fileperms($this->localZoneFile)) {
			return "No access to $this->localZoneFile. Please check permissions.";
		}
		
		$localZones = file_get_contents($this->localZoneFile);
		
		foreach($domains as $domain) {
			if(!str_contains($localZones, $domain['name'])) {
				$errors[] = $domain['name'] . " is missing in '$this->localZoneFile'";
			}
			
			$zoneFile = $this->localZonesDir . $domain['name'];
			
			if (!file_exists($zoneFile)) {
				$errors[] = "Missing zone file for $zoneFile. Update zone to create it";
			}
		}
		
		if (empty($errors)) {
			return true;
		} else {
			return $errors;
		}
	}
	
	
	/**
	 * @param mixed $name
	 * @param mixed $a
	 * @param mixed $aaaa
	 *
	 * @return void
	 */
	public function createZoneFile(String $name, String $a, String $aaaa): void
	{
		if ($zonefile = fopen(filename: $this->localZonesDir . $name, mode: 'w')) {
			fputs($zonefile, data: "zone \"$name\" IN {" . PHP_EOL);
			fputs($zonefile, data: "\ttype slave;" . PHP_EOL);
			fputs($zonefile, data: "\tfile \"" . $this->zoneCachePath . $name . '.db";' . PHP_EOL);
			fputs($zonefile, data: "\tmasters {" . PHP_EOL);
			if (!empty($a)) {
				fputs($zonefile, data: "\t\t$a;" . PHP_EOL);
			}
			if (!empty($aaaa)) {
				fputs($zonefile, data: "\t\t$aaaa;" . PHP_EOL);
			}
			fputs($zonefile, data: "\t};" . PHP_EOL);
			fputs($zonefile, data: "};" . PHP_EOL);
		}
		
		// TODO check if ist exist in the include, else create
	}
}