<?php

/**

 * Base WordPress Image Editor

 *

 * @package WordPress

 * @subpackage Image_Editor

 */

/**

 * Base image editor class from which implementations extend

 *

 * @since 3.5.0

 */

abstract class WP_Image_Editor {

	protected $file = null;

	protected $size = null;

	protected $mime_type = null;

	protected $default_mime_type = 'image/jpeg';

	protected $quality = 90;

	/**

	 * Each instance handles a single file.

	 */

	public function __construct( $file ) {

		$this->file = $file;

	}

	/**

	 * Checks to see if current environment supports the editor chosen.

	 * Must be overridden in a sub-class.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param array $args

	 * @return boolean

	 */

	public static function test( $args = array() ) {

		return false;

	}

	/**

	 * Checks to see if editor supports the mime-type specified.

	 * Must be overridden in a sub-class.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param string $mime_type

	 * @return boolean

	 */

	public static function supports_mime_type( $mime_type ) {

		return false;

	}

	/**

	 * Loads image from $this->file into editor.

	 *

	 * @since 3.5.0

	 * @access protected

	 * @abstract

	 *

	 * @return boolean|WP_Error True if loaded; WP_Error on failure.

	 */

	abstract public function load();

	/**

	 * Saves current image to file.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param string $destfilename

	 * @param string $mime_type

	 * @return array|WP_Error {'path'=>string, 'file'=>string, 'width'=>int, 'height'=>int, 'mime-type'=>string}

	 */

	abstract public function save( $destfilename = null, $mime_type = null );

	/**

	 * Resizes current image.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param int $max_w

	 * @param int $max_h

	 * @param boolean $crop

	 * @return boolean|WP_Error

	 */

	abstract public function resize( $max_w, $max_h, $crop = false );

	/**

	 * Processes current image and saves to disk

	 * multiple sizes from single source.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param array $sizes { {'width'=>int, 'height'=>int, 'crop'=>bool}, ... }

	 * @return array

	 */

	abstract public function multi_resize( $sizes );

	/**

	 * Crops Image.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param string|int $src The source file or Attachment ID.

	 * @param int $src_x The start x position to crop from.

	 * @param int $src_y The start y position to crop from.

	 * @param int $src_w The width to crop.

	 * @param int $src_h The height to crop.

	 * @param int $dst_w Optional. The destination width.

	 * @param int $dst_h Optional. The destination height.

	 * @param boolean $src_abs Optional. If the source crop points are absolute.

	 * @return boolean|WP_Error

	 */

	abstract public function crop( $src_x, $src_y, $src_w, $src_h, $dst_w = null, $dst_h = null, $src_abs = false );

	/**

	 * Rotates current image counter-clockwise by $angle.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param float $angle

	 * @return boolean|WP_Error

	 */

	abstract public function rotate( $angle );

	/**

	 * Flips current image.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param boolean $horz Horizontal Flip

	 * @param boolean $vert Vertical Flip

	 * @return boolean|WP_Error

	 */

	abstract public function flip( $horz, $vert );

	/**

	 * Streams current image to browser.

	 *

	 * @since 3.5.0

	 * @access public

	 * @abstract

	 *

	 * @param string $mime_type

	 * @return boolean|WP_Error

	 */

	abstract public function stream( $mime_type = null );

	/**

	 * Gets dimensions of image.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @return array {'width'=>int, 'height'=>int}

	 */

	public function get_size() {

		return $this->size;

	}

	/**

	 * Sets current image size.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param int $width

	 * @param int $height

	 */

	protected function update_size( $width = null, $height = null ) {

		$this->size = array(

			'width' => (int) $width,

			'height' => (int) $height

		);

		return true;

	}

	/**

	 * Sets Image Compression quality on a 1-100% scale.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param int $quality Compression Quality. Range: [1,100]

	 * @return boolean

	 */

	public function set_quality( $quality ) {

		$this->quality = apply_filters( 'wp_editor_set_quality', $quality );

		return ( (bool) $this->quality );

	}

	/**

	 * Returns preferred mime-type and extension based on provided

	 * file's extension and mime, or current file's extension and mime.

	 *

	 * Will default to $this->default_mime_type if requested is not supported.

	 *

	 * Provides corrected filename only if filename is provided.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param string $filename

	 * @param string $mime_type

	 * @return array { filename|null, extension, mime-type }

	 */

	protected function get_output_format( $filename = null, $mime_type = null ) {

		$new_ext = $file_ext = null;

		$file_mime = null;

		// By default, assume specified type takes priority

		if ( $mime_type ) {

			$new_ext = $this->get_extension( $mime_type );

		}

		if ( $filename ) {

			$file_ext = strtolower( pathinfo( $filename, PATHINFO_EXTENSION ) );

			$file_mime = $this->get_mime_type( $file_ext );

		}

		else {

			// If no file specified, grab editor's current extension and mime-type.

			$file_ext = strtolower( pathinfo( $this->file, PATHINFO_EXTENSION ) );

			$file_mime = $this->mime_type;

		}

		// Check to see if specified mime-type is the same as type implied by

		// file extension.  If so, prefer extension from file.

		if ( ! $mime_type || ( $file_mime == $mime_type ) ) {

			$mime_type = $file_mime;

			$new_ext = $file_ext;

		}

		// Double-check that the mime-type selected is supported by the editor.

		// If not, choose a default instead.

		if ( ! $this->supports_mime_type( $mime_type ) ) {

			$mime_type = apply_filters( 'image_editor_default_mime_type', $this->default_mime_type );

			$new_ext = $this->get_extension( $mime_type );

		}

		if ( $filename ) {

			$ext = '';

			$info = pathinfo( $filename );

			$dir  = $info['dirname'];

			if( isset( $info['extension'] ) )

				$ext = $info['extension'];

			$filename = trailingslashit( $dir ) . wp_basename( $filename, ".$ext" ) . ".{$new_ext}";

		}

		return array( $filename, $new_ext, $mime_type );

	}

	/**

	 * Builds an output filename based on current file, and adding proper suffix

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @param string $suffix

	 * @param string $dest_path

	 * @param string $extension

	 * @return string filename

	 */

	public function generate_filename( $suffix = null, $dest_path = null, $extension = null ) {

		// $suffix will be appended to the destination filename, just before the extension

		if ( ! $suffix )

			$suffix = $this->get_suffix();

		$info = pathinfo( $this->file );

		$dir  = $info['dirname'];

		$ext  = $info['extension'];

		$name = wp_basename( $this->file, ".$ext" );

		$new_ext = strtolower( $extension ? $extension : $ext );

		if ( ! is_null( $dest_path ) && $_dest_path = realpath( $dest_path ) )

			$dir = $_dest_path;

		return trailingslashit( $dir ) . "{$name}-{$suffix}.{$new_ext}";

	}

	/**

	 * Builds and returns proper suffix for file based on height and width.

	 *

	 * @since 3.5.0

	 * @access public

	 *

	 * @return string suffix

	 */

	public function get_suffix() {

		if ( ! $this->get_size() )

			return false;

		return "{$this->size['width']}x{$this->size['height']}";

	}

	/**

	 * Either calls editor's save function or handles file as a stream.

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param string|stream $filename

	 * @param callable $function

	 * @param array $arguments

	 * @return boolean

	 */

	protected function make_image( $filename, $function, $arguments ) {

		$dst_file = $filename;

		if ( $stream = wp_is_stream( $filename ) ) {

			$filename = null;

			ob_start();

		}

		$result = call_user_func_array( $function, $arguments );

		if ( $result && $stream ) {

			$contents = ob_get_contents();

			$fp = fopen( $dst_file, 'w' );

			if ( ! $fp )

				return false;

			fwrite( $fp, $contents );

			fclose( $fp );

		}

		if ( $stream ) {

			ob_end_clean();

		}

		return $result;

	}

	/**

	 * Returns first matched mime-type from extension,

	 * as mapped from wp_get_mime_types()

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param string $extension

	 * @return string|boolean

	 */

	protected static function get_mime_type( $extension = null ) {

		if ( ! $extension )

			return false;

		$mime_types = wp_get_mime_types();

		$extensions = array_keys( $mime_types );

		foreach( $extensions as $_extension ) {

			if ( preg_match( "/{$extension}/i", $_extension ) ) {

				return $mime_types[$_extension];

			}

		}

		return false;

	}

	/**

	 * Returns first matched extension from Mime-type,

	 * as mapped from wp_get_mime_types()

	 *

	 * @since 3.5.0

	 * @access protected

	 *

	 * @param string $mime_type

	 * @return string|boolean

	 */

	protected static function get_extension( $mime_type = null ) {

		$extensions = explode( '|', array_search( $mime_type, wp_get_mime_types() ) );

		if ( empty( $extensions[0] ) )

			return false;

		return $extensions[0];

	}

}