<?php
/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         0.2.9
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Filesystem;

use finfo;
use SplFileInfo;

/**
 * Convenience class for reading, writing and appending to files.
 */
class File
{

    /**
     * Folder object of the file
     *
     * @var \Cake\Filesystem\Folder
     * @link https://book.cakephp.org/3.0/en/core-libraries/file-folder.html
     */
    public $Folder;

    /**
     * File name
     *
     * @var string
     * https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#Cake\Filesystem\File::$name
     */
    public $name;

    /**
     * File info
     *
     * @var array
     * https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#Cake\Filesystem\File::$info
     */
    public $info = [];

    /**
     * Holds the file handler resource if the file is opened
     *
     * @var resource|null
     * https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#Cake\Filesystem\File::$handle
     */
    public $handle;

    /**
     * Enable locking for file reading and writing
     *
     * @var bool|null
     * https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#Cake\Filesystem\File::$lock
     */
    public $lock;

    /**
     * Path property
     *
     * Current file's absolute path
     *
     * @var string|null
     * https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#Cake\Filesystem\File::$path
     */
    public $path;

    /**
     * Constructor
     *
     * @param string $path Path to file
     * @param bool $create Create file if it does not exist (if true)
     * @param int $mode Mode to apply to the folder holding the file
     * @link https://book.cakephp.org/3.0/en/core-libraries/file-folder.html#file-api
     */
    public function __construct($path, $create = false, $mode = 0755)
    {
        $splInfo = new SplFileInfo($path);
        $this->Folder = new Folder($splInfo->getPath(), $create, $mode);
        if (!is_dir($path)) {
            $this->name = ltrim($splInfo->getFilename(), '/\\');
        }
        $this->pwd();
        $create && !$this->exists() && $this->safe($path) && $this->create();
    }

    /**
     * Closes the current file if it is opened
     */
    public function __destruct()
    {
        $this->close();
    }

    /**
     * Creates the file.
     *
     * @return bool Success
     */
    public function create()
    {
        $dir = $this->Folder->pwd();

        if (is_dir($dir) && is_writable($dir) && !$this->exists() && touch($this->path)) {
            return true;
        }

        return false;
    }

    /**
     * Opens the current file with a given $mode
     *
     * @param string $mode A valid 'fopen' mode string (r|w|a ...)
     * @param bool $force If true then the file will be re-opened even if its already opened, otherwise it won't
     * @return bool True on success, false on failure
     */
    public function open($mode = 'r', $force = false)
    {
        if (!$force && is_resource($this->handle)) {
            return true;
        }
        if ($this->exists() === false && $this->create() === false) {
            return false;
        }

        $this->handle = fopen($this->path, $mode);

        return is_resource($this->handle);
    }

    /**
     * Return the contents of this file as a string.
     *
     * @param string|bool $bytes where to start
     * @param string $mode A `fread` compatible mode.
     * @param bool $force If true then the file will be re-opened even if its already opened, otherwise it won't
     * @return string|false string on success, false on failure
     */
    public function read($bytes = false, $mode = 'rb', $force = false)
    {
        if ($bytes === false && $this->lock === null) {
            return file_get_contents($this->path);
        }
        if ($this->open($mode, $force) === false) {
            return false;
        }
        if ($this->lock !== null && flock($this->handle, LOCK_SH) === false) {
            return false;
        }
        if (is_int($bytes)) {
            return fread($this->handle, $bytes);
        }

        $data = '';
        while (!feof($this->handle)) {
            $data .= fgets($this->handle, 4096);
        }

        if ($this->lock !== null) {
            flock($this->handle, LOCK_UN);
        }
        if ($bytes === false) {
            $this->close();
        }

        return trim($data);
    }

    /**
     * Sets or gets the offset for the currently opened file.
     *
     * @param int|bool $offset The $offset in bytes to seek. If set to false then the current offset is returned.
     * @param int $seek PHP Constant SEEK_SET | SEEK_CUR | SEEK_END determining what the $offset is relative to
     * @return int|bool True on success, false on failure (set mode), false on failure or integer offset on success (get mode)
     */
    public function offset($offset = false, $seek = SEEK_SET)
    {
        if ($offset === false) {
            if (is_resource($this->handle)) {
                return ftell($this->handle);
            }
        } elseif ($this->open() === true) {
            return fseek($this->handle, $offset, $seek) === 0;
        }

        return false;
    }

    /**
     * Prepares an ASCII string for writing. Converts line endings to the
     * correct terminator for the current platform. If Windows, "\r\n" will be used,
     * all other platforms will use "\n"
     *
     * @param string $data Data to prepare for writing.
     * @param bool $forceWindows If true forces Windows new line string.
     * @return string The with converted line endings.
     */
    public static function prepare($data, $forceWindows = false)
    {
        $lineBreak = "\n";
        if (DIRECTORY_SEPARATOR === '\\' || $forceWindows === true) {
            $lineBreak = "\r\n";
        }

        return strtr($data, ["\r\n" => $lineBreak, "\n" => $lineBreak, "\r" => $lineBreak]);
    }

    /**
     * Write given data to this file.
     *
     * @param string $data Data to write to this File.
     * @param string $mode Mode of writing. {@link https://secure.php.net/fwrite See fwrite()}.
     * @param bool $force Force the file to open
     * @return bool Success
     */
    public function write($data, $mode = 'w', $force = false)
    {
        $success = false;
        if ($this->open($mode, $force) === true) {
            if ($this->lock !== null && flock($this->handle, LOCK_EX) === false) {
                return false;
            }

            if (fwrite($this->handle, $data) !== false) {
                $success = true;
            }
            if ($this->lock !== null) {
                flock($this->handle, LOCK_UN);
            }
        }

        return $success;
    }

    /**
     * Append given data string to this file.
     *
     * @param string $data Data to write
     * @param bool $force Force the file to open
     * @return bool Success
     */
    public function append($data, $force = false)
    {
        return $this->write($data, 'a', $force);
    }

    /**
     * Closes the current file if it is opened.
     *
     * @return bool True if closing was successful or file was already closed, otherwise false
     */
    public function close()
    {
        if (!is_resource($this->handle)) {
            return true;
        }

        return fclose($this->handle);
    }

    /**
     * Deletes the file.
     *
     * @return bool Success
     */
    public function delete()
    {
        if (is_resource($this->handle)) {
            fclose($this->handle);
            $this->handle = null;
        }
        if ($this->exists()) {
            return unlink($this->path);
        }

        return false;
    }

    /**
     * Returns the file info as an array with the following keys:
     *
     * - dirname
     * - basename
     * - extension
     * - filename
     * - filesize
     * - mime
     *
     * @return array File information.
     */
    public function info()
    {
        if (!$this->info) {
            $this->info = pathinfo($this->path);
        }
        if (!isset($this->info['filename'])) {
            $this->info['filename'] = $this->name();
        }
        if (!isset($this->info['filesize'])) {
            $this->info['filesize'] = $this->size();
        }
        if (!isset($this->info['mime'])) {
            $this->info['mime'] = $this->mime();
        }

        return $this->info;
    }

    /**
     * Returns the file extension.
     *
     * @return string|false The file extension, false if extension cannot be extracted.
     */
    public function ext()
    {
        if (!$this->info) {
            $this->info();
        }
        if (isset($this->info['extension'])) {
            return $this->info['extension'];
        }

        return false;
    }

    /**
     * Returns the file name without extension.
     *
     * @return string|false The file name without extension, false if name cannot be extracted.
     */
    public function name()
    {
        if (!$this->info) {
            $this->info();
        }
        if (isset($this->info['extension'])) {
            return static::_basename($this->name, '.' . $this->info['extension']);
        }
        if ($this->name) {
            return $this->name;
        }

        return false;
    }

    /**
     * Returns the file basename. simulate the php basename() for multibyte (mb_basename).
     *
     * @param string $path Path to file
     * @param string|null $ext The name of the extension
     * @return string the file basename.
     */
    protected static function _basename($path, $ext = null)
    {
        // check for multibyte string and use basename() if not found
        if (mb_strlen($path) === strlen($path)) {
            return ($ext === null)? basename($path) : basename($path, $ext);
        }

        $splInfo = new SplFileInfo($path);
        $name = ltrim($splInfo->getFilename(), '/\\');

        if ($ext === null || $ext === '') {
            return $name;
        }
        $ext = preg_quote($ext);
        $new = preg_replace("/({$ext})$/u", "", $name);

        // basename of '/etc/.d' is '.d' not ''
        return ($new === '')? $name : $new;
    }

    /**
     * Makes file name safe for saving
     *
     * @param string|null $name The name of the file to make safe if different from $this->name
     * @param string|null $ext The name of the extension to make safe if different from $this->ext
     * @return string The extension of the file
     */
    public function safe($name = null, $ext = null)
    {
        if (!$name) {
            $name = $this->name;
        }
        if (!$ext) {
            $ext = $this->ext();
        }

        return preg_replace("/(?:[^\w\.-]+)/", '_', static::_basename($name, $ext));
    }

    /**
     * Get md5 Checksum of file with previous check of Filesize
     *
     * @param int|bool $maxsize in MB or true to force
     * @return string|false md5 Checksum {@link https://secure.php.net/md5_file See md5_file()}, or false in case of an error
     */
    public function md5($maxsize = 5)
    {
        if ($maxsize === true) {
            return md5_file($this->path);
        }

        $size = $this->size();
        if ($size && $size < ($maxsize * 1024) * 1024) {
            return md5_file($this->path);
        }

        return false;
    }

    /**
     * Returns the full path of the file.
     *
     * @return string Full path to the file
     */
    public function pwd()
    {
        if ($this->path === null) {
            $dir = $this->Folder->pwd();
            if (is_dir($dir)) {
                $this->path = $this->Folder->slashTerm($dir) . $this->name;
            }
        }

        return $this->path;
    }

    /**
     * Returns true if the file exists.
     *
     * @return bool True if it exists, false otherwise
     */
    public function exists()
    {
        $this->clearStatCache();

        return (file_exists($this->path) && is_file($this->path));
    }

    /**
     * Returns the "chmod" (permissions) of the file.
     *
     * @return string|false Permissions for the file, or false in case of an error
     */
    public function perms()
    {
        if ($this->exists()) {
            return substr(sprintf('%o', fileperms($this->path)), -4);
        }

        return false;
    }

    /**
     * Returns the file size
     *
     * @return int|false Size of the file in bytes, or false in case of an error
     */
    public function size()
    {
        if ($this->exists()) {
            return filesize($this->path);
        }

        return false;
    }

    /**
     * Returns true if the file is writable.
     *
     * @return bool True if it's writable, false otherwise
     */
    public function writable()
    {
        return is_writable($this->path);
    }

    /**
     * Returns true if the File is executable.
     *
     * @return bool True if it's executable, false otherwise
     */
    public function executable()
    {
        return is_executable($this->path);
    }

    /**
     * Returns true if the file is readable.
     *
     * @return bool True if file is readable, false otherwise
     */
    public function readable()
    {
        return is_readable($this->path);
    }

    /**
     * Returns the file's owner.
     *
     * @return int|false The file owner, or false in case of an error
     */
    public function owner()
    {
        if ($this->exists()) {
            return fileowner($this->path);
        }

        return false;
    }

    /**
     * Returns the file's group.
     *
     * @return int|false The file group, or false in case of an error
     */
    public function group()
    {
        if ($this->exists()) {
            return filegroup($this->path);
        }

        return false;
    }

    /**
     * Returns last access time.
     *
     * @return int|false Timestamp of last access time, or false in case of an error
     */
    public function lastAccess()
    {
        if ($this->exists()) {
            return fileatime($this->path);
        }

        return false;
    }

    /**
     * Returns last modified time.
     *
     * @return int|false Timestamp of last modification, or false in case of an error
     */
    public function lastChange()
    {
        if ($this->exists()) {
            return filemtime($this->path);
        }

        return false;
    }

    /**
     * Returns the current folder.
     *
     * @return \Cake\Filesystem\Folder Current folder
     */
    public function folder()
    {
        return $this->Folder;
    }

    /**
     * Copy the File to $dest
     *
     * @param string $dest Absolute path to copy the file to.
     * @param bool $overwrite Overwrite $dest if exists
     * @return bool Success
     */
    public function copy($dest, $overwrite = true)
    {
        if (!$this->exists() || is_file($dest) && !$overwrite) {
            return false;
        }

        return copy($this->path, $dest);
    }

    /**
     * Gets the mime type of the file. Uses the finfo extension if
     * it's available, otherwise falls back to mime_content_type().
     *
     * @return false|string The mimetype of the file, or false if reading fails.
     */
    public function mime()
    {
        if (!$this->exists()) {
            return false;
        }
        if (class_exists('finfo')) {
            $finfo = new finfo(FILEINFO_MIME);
            $type = $finfo->file($this->pwd());
            if (!$type) {
                return false;
            }
            list($type) = explode(';', $type);

            return $type;
        }
        if (function_exists('mime_content_type')) {
            return mime_content_type($this->pwd());
        }

        return false;
    }

    /**
     * Clear PHP's internal stat cache
     *
     * @param bool $all Clear all cache or not. Passing false will clear
     *   the stat cache for the current path only.
     * @return void
     */
    public function clearStatCache($all = false)
    {
        if ($all === false) {
            clearstatcache(true, $this->path);
        }

        clearstatcache();
    }

    /**
     * Searches for a given text and replaces the text if found.
     *
     * @param string|array $search Text(s) to search for.
     * @param string|array $replace Text(s) to replace with.
     * @return bool Success
     */
    public function replaceText($search, $replace)
    {
        if (!$this->open('r+')) {
            return false;
        }

        if ($this->lock !== null && flock($this->handle, LOCK_EX) === false) {
            return false;
        }

        $replaced = $this->write(str_replace($search, $replace, $this->read()), 'w', true);

        if ($this->lock !== null) {
            flock($this->handle, LOCK_UN);
        }
        $this->close();

        return $replaced;
    }
}