<?php

	namespace filemanager\core;


	class FileManager{


		/* CREATES A FILE WITH ITS NEEDED DIRECTORIES
		*
		* @path<String> 										Path of the needed file
		*
		* @return created<Boolean> 								If the file has been created successfully
		*
		*/
		public static function create($file){
			/* (0) Checks arguments */
			if( !is_string($file) || is_dir($file) )
				return false;

			/* (1) Creates file */
			try{
				fclose( fopen($file, 'w') );
				return true;
			}catch(\Exception $e){ return false; }
		}


		/* READS FILE'S CONTENT
		*
		* @file<String> 										File to read
		*
		*/
		public static function read($file){
			/* (0) Checks arguments */
			if( !is_string($file) )
				throw new \Exception('Wrong argument for read(<String>).');

			/* (1) Initializing driver on file (read-flag) */
			$driver = new \SplFileObject($file, 'r');

			/* (2) Read lines */
			$read = '';

			$line = 0;
			while( $driver->current() ){
				$read .= $driver->current();
				$driver->next();
			}

			/* (3) Returns result */
			return $read;
		}

		/* READS A FILE'S SPECIFIC LINE
		*
		* @file<String> 										File to read
		* @line<int>											Line to read
		*
		*/
		public static function readline($file, $line){
			/* (0) Checks arguments */
			if( !is_string($file) || intval($line) !== $line )
				throw new \Exception('Wrong argument for readline(<String>, <int>).');

			/* (1) Initializing driver on file (read-flag) */
			$driver = new \SplFileObject($file, 'r');

			/* (2) Goto specific line */
			$driver->seek($line);

			/* (3) Return line's content */
			if( $driver->key() == $line )
				return $driver->current();
			else
				return null;
		}

		/* WRITES A FILE'S SPECIFIC LINE
		*
		* @file<String> 										File to read
		* @line<int>											Line to read
		*
		*/
		public static function writeline($file, $line){
			/* (0) Checks arguments */
			if( !is_string($file) || intval($line) !== $line )
				throw new \Exception('Wrong argument for writeline(<String>, <int>).');

			/* (1) Initializing driver on file (read-flag) */
			$driver = new \SplFileObject($file, 'r');

			/* (2) Goto specific line */
			$driver->seek($line);

			/* (3) Return line's content */
			if( $driver->key() == $line )
				return $driver->current();
			else
				return null;
		}


		/* WRITES CONTENT TO A FILE
		*
		* @file<String>											File to write to
		* @content<String>										Content to write
		*
		* @return written<Boolean>								Returns if the content have been written successfully
		*
		* @note: Creates file if it is possible with `file_put_contents()`
		*
		*/
		public static function write($file, $content){
			/* (0) Checks arguments */
			if( !is_string($file) || !is_string($content) )
				return false;

			/* (1) Erase file */
			try{
				fclose( fopen($file, 'w') );
			}catch(\Exception $e){ return false; }

			/* (2) Get driver (write-flag) */
			$driver = new \SplFileObject($file, 'r+');

			/* (3) Writes content */
			return !is_null( $driver->fwrite($content) );

		}


		/* APPENDS CONTENT TO A FILE
		*
		* @file<String> 										File to append content to
		* @content<String>										Content to append
		*
		* @return append<Boolean>								Returns if the content have been append successfully
		*
		* @note: If file doesn't exists, returns false
		*
		*/
		public static function append($file, $content){
			/* (0) Checks arguments */
			if( !is_file($file) || !is_string($content) )
				return false;

			/* (1) Get driver (append-flag) */
			$driver = new \SplFileObject($file, 'a');

			/* (2) append content */
			return !is_null( $driver->fwrite($content.PHP_EOL) );
		}


	}

?>