<?php
/**
 * Filesystem methods.
 * Used primarily in the compilers.
 *
 * @package Fusion-Library
 * @since 1.0.0
 */

// Do not allow directly accessing this file.
if ( ! defined( 'ABSPATH' ) ) {
	exit( 'Direct script access denied.' );
}

/**
 * Extra methods that are necessary for the compilers.
 */
class Fusion_Filesystem {

	/**
	 * The file relative to wp-content/uploads.
	 * No '/' at the beginning.
	 *
	 * @access private
	 * @since 1.0.0
	 * @var string
	 */
	private $file = '';

	/**
	 * The file path.
	 *
	 * @access private
	 * @since 1.0.0
	 * @var string
	 */
	private $path = '';

	/**
	 * The $wp_filesystem object.
	 *
	 * @access private
	 * @since 1.0.0
	 * @var object WP_Filesystem
	 */
	private $wp_filesystem;

	/**
	 * Constructor.
	 *
	 * @access public
	 * @since 1.0.0
	 * @param string $file The file path relative to wp-content/uploads.
	 */
	public function __construct( $file ) {

		// Set the $wp_filesystem property.
		$this->wp_filesystem = Fusion_Helper::init_filesystem();
		// Set the $file property.
		$this->set_file( $file );
		// Set the $path property.
		$this->set_path();

	}

	/**
	 * Sets the $path property.
	 *
	 * @access private
	 * @since 1.0.0
	 * @param string $file The file path relative to wp-content/uploads.
	 * @return void
	 */
	private function set_file( $file ) {

		// Get the upload directory for this site.
		$upload_dir = wp_upload_dir();

		// Remove '/' from the beginning of the string.
		$this->file = ltrim( $file, '/' );

	}

	/**
	 * Sets the $path property.
	 *
	 * @access private
	 * @since 1.0.0
	 * @return void
	 */
	private function set_path() {

		// Get the upload directory for this site.
		$upload_dir = wp_upload_dir();

		// Build the bath.
		$this->path = wp_normalize_path( $upload_dir['basedir'] . '/' . $this->file );

	}

	/**
	 * Gets the $path property.
	 *
	 * @access public
	 * @since 1.0.0
	 * @return string
	 */
	public function get_path() {

		return $this->path;

	}

	/**
	 * Write file.
	 *
	 * @access public
	 * @since 1.0.0
	 * @param string $content The file contents.
	 * @return bool Whether the file-write was successful or not.
	 */
	public function write_file( $content ) {
		// Check if the file is writable.
		if ( ! $this->is_writable() ) {
			return false;
		}

		if ( ! $this->wp_filesystem->put_contents( $this->path, $content ) ) {
			// Writing to the file failed.
			return false;
		}
		return true;

	}

	/**
	 * Is the file writable?
	 *
	 * @access public
	 * @since 1.0.0
	 * @return bool
	 */
	public function is_writable() {
		$directory_separator = '/';

		// Build the folder path.
		$file_parts = explode( $directory_separator, $this->path );
		if ( 2 <= count( $file_parts ) ) {
			unset( $file_parts[ count( $file_parts ) - 1 ] );
		}
		$folder_path = implode( $directory_separator, $file_parts );

		// Does the folder exist?
		if ( file_exists( $folder_path ) ) {
			// Folder exists, but is it actually writable?
			if ( ! $this->wp_filesystem->is_writable( $folder_path ) ) {
				// Folder is not writable.
				// Does the file exist?
				if ( ! file_exists( $this->path ) ) {
					// If the file does not exist, then we can't create it
					// since its parent folder is not writable.
					return false;
				} else {
					// The file exists. Is it writable?
					if ( ! $this->wp_filesystem->is_writable( $this->path ) ) {
						// Nope, it's not writable.
						return false;
					}
				}
			} else {
				// The folder is writable.
				// Does the file exist?
				if ( file_exists( $this->path ) ) {
					// File exists. Is it writable?
					if ( ! $this->wp_filesystem->is_writable( $this->path ) ) {
						// Nope, it's not writable.
						return false;
					}
				}
			}
		} else {
			// Can we create the folder?
			// returns true if yes and false if not.
			$permissions = ( defined( 'FS_CHMOD_DIR' ) ) ? FS_CHMOD_DIR : 0755;
			return $this->wp_filesystem->mkdir( $folder_path, $permissions );
		}

		// If we passed all of the above tests
		// then the file is writable.
		return true;
	}

	/**
	 * Gets the URL to the file.
	 *
	 * @access public
	 * @since 1.0.0
	 * @return string
	 */
	public function get_url() {

		// Get the upload directory for this site.
		$upload_dir = wp_upload_dir();
		$url = trailingslashit( $upload_dir['baseurl'] ) . $this->file;
		// Take care of domain mapping.
		// When using domain mapping we have to make sure that the URL to the file
		// does not include the original domain but instead the mapped domain.
		if ( defined( 'DOMAIN_MAPPING' ) && DOMAIN_MAPPING ) {
			if ( function_exists( 'domain_mapping_siteurl' ) && function_exists( 'get_original_url' ) ) {
				$mapped_domain   = domain_mapping_siteurl( false );
				$original_domain = get_original_url( 'siteurl' );
				$url = str_replace( $original_domain, $mapped_domain, $url );
			}
		}
		// Strip protocols from the URL.
		// Make sure we don't have any issues with sites using HTTPS/SSL.
		$url = str_replace( 'https://', '//', $url );
		$url = str_replace( 'http://', '//', $url );

		$timestamp = ( file_exists( $this->path ) ) ? '?timestamp=' . filemtime( $this->path ) : '';

		return $url . $timestamp;
	}
}
