<?php

/**
 * Media
 *
 * @package   Kirby Toolkit
 * @author    Bastian Allgeier <bastian@getkirby.com>
 * @link      http://getkirby.com
 * @copyright Bastian Allgeier
 * @license   http://www.opensource.org/licenses/mit-license.php MIT License
 */
class Media {

  // optional url where the file is reachable
  public $url = null;

  // the full path for the file
  protected $root = null;

  // the filename including the extension
  protected $filename = null;

  // the name excluding the extension
  protected $name = null;

  // the extension of the file
  protected $extension = null;

  // the content of the file
  protected $content = null;

  // cache for various data
  protected $cache = array();

  /**
   * Constructor
   *
   * @param string $root
   */
  public function __construct($root, $url = null) {
    $this->url       = $url;
    $this->root      = $root === null ? $root : realpath($root);
    $this->filename  = basename($root);
    $this->name      = pathinfo($root, PATHINFO_FILENAME);
    $this->extension = strtolower(pathinfo($root, PATHINFO_EXTENSION));
  }

  /**
   * Resets the internal cache
   */
  public function reset() {
    $this->cache = array();
  }

  /**
   * Returns the full root of the asset
   *
   * @return string
   */
  public function root() {
    return $this->root;
  }

  /**
   * Returns the url
   *
   * @return string
   */
  public function url() {
    return $this->url;
  }

  /**
   * Returns a md5 hash of the root
   */
  public function hash() {
    return md5($this->root);
  }

  /**
   * Returns the parent directory path
   *
   * @return string
   */
  public function dir() {
    return dirname($this->root);
  }

  /**
   * Returns the filename of the file
   * i.e. somefile.jpg
   *
   * @return string
   */
  public function filename() {
    return $this->filename;
  }

  /**
   * Returns the name of the file without extension
   *
   * @return string
   */
  public function name() {
    return $this->name;
  }

  /**
   * Returns the filename as safe name
   *
   * @return string
   */
  public function safeName() {
    return f::safeName($this->filename());
  }

  /**
   * Returns the extension of the file
   * i.e. jpg
   *
   * @return string
   */
  public function extension() {
    // return the current extension
    return $this->extension;
  }

  /**
   * Reads the file content and parses it
   *
   * @param string $format
   * @return mixed
   */
  public function read($format = null) {
    return str::parse($this->content(), $format);
  }

  /**
   * Setter and getter for the file content
   *
   * @param string $content
   * @return string
   */
  public function content($content = null, $format = null) {

    if(!is_null($content)) {
      if(is_array($content)) {
        switch($format) {
          case 'json':
            $content = json_encode($content);
            break;
          case 'yaml':
            $content = yaml::encode($content);
            break;
          default:
            $content = serialize($content);
            break;
        }
      } else if(is_object($content)) {
        $content = serialize($content);
      }
      return $this->content = $content;
    }

    if(is_null($this->content)) {
      $this->content = file_get_contents($this->root);
    }

    return $this->content;

  }

  /**
   * Saves the file
   *
   * @param string $content
   * @return boolean
   */
  public function save($content = null, $format = null) {
    $content = $this->content($content, $format);
    return f::write($this->root, $content);
  }

  /**
   * Alternative for save
   *
   * @param string $content
   * @return boolean
   */
  public function write($content = null, $format = null) {
    return $this->save($content, $format);
  }

  /**
   * Change the file's modification date to now
   * and create it with an empty content if it is not there yet
   *
   * @return boolean
   */
  public function touch() {
    return touch($this->root);
  }

  /**
   * Appends the content and saves the file
   *
   * @param string $content
   * @return boolean
   */
  public function append($content) {
    $this->content = $this->content() . $content;
    return $this->save();
  }

  /**
   * Deletes the file
   *
   * @return boolean
   */
  public function delete() {
    return f::remove($this->root);
  }

  /**
   * Alternative for delete
   *
   * @return boolean
   */
  public function remove() {
    return f::remove($this->root);
  }

  /**
   * Moves the file to a new location
   *
   * @param string $to
   * @return boolean
   */
  public function move($to) {
    if(!f::move($this->root, $to)) {
      return false;
    } else {
      $this->root = $to;
      return true;
    }
  }

  /**
   * Copies the file to a new location
   *
   * @param string $to
   * @return boolean
   */
  public function copy($to) {
    return f::copy($this->root, $to);
  }

  /**
   * Returns the file size as integer
   *
   * @return int
   */
  public function size() {
    return f::size($this->root);
  }

  /**
   * Returns the human readable version of the file size
   *
   * @return string
   */
  public function niceSize() {
    return f::niceSize($this->size());
  }

  /**
   * Get the file's last modification time.
   *
   * @return int
   */
  public function modified($format = null, $handler = 'date') {
    return f::modified($this->root, $format, $handler);
  }

  /**
   * Returns the mime type of a file
   *
   * @return string
   */
  public function mime() {
    return f::mime($this->root);
  }

  /**
   * Categorize the file
   *
   * @return string
   */
  public function type() {
    return f::type($this->root);
  }

  /**
   * Checks if a file is of a certain type
   *
   * @param string $value An extension or mime type
   * @return boolean
   */
  public function is($value) {
    return f::is($this->root, $value);
  }

  /**
   * Returns the file content as base64 encoded string
   *
   * @return string
   */
  public function base64() {
    return base64_encode($this->content());
  }

  /**
   * Returns the file as data uri
   *
   * @return string
   */
  public function dataUri() {
    return 'data:' . $this->mime() . ';base64,' . $this->base64();
  }

  /**
   * Checks if the file exists
   *
   * @return boolean
   */
  public function exists() {
    return file_exists($this->root);
  }

  /**
   * Checks if the file is writable
   *
   * @return boolean
   */
  public function isWritable() {
    return is_writable($this->root);
  }

  /**
   * Checks if the file is readable
   *
   * @return boolean
   */
  public function isReadable() {
    return is_readable($this->root);
  }

  /**
   * Checks if the file is executable
   *
   * @return boolean
   */
  public function isExecutable() {
    return is_executable($this->root);
  }

  /**
   * Sends an appropriate header for the asset
   *
   * @param boolean $send
   * @return mixed
   */
  public function header($send = true) {
    return header::type($this->mime(), false, $send);
  }

  /**
   * Safely requires a file if it exists
   *
   * @param array $data Optional variables, which will be made available to the file
   */
  public function load($data = array()) {
    return f::load($this->root, $data);
  }

  /**
   * Read and send the file with the correct headers
   */
  public function show() {
    f::show($this->root);
  }

  /*
   * Automatically sends all needed headers for the file to be downloaded
   * and echos the file's content
   *
   * @param string $filename Optional filename for the download
   */
  public function download($filename = null) {
    f::download($this->root, $filename);
  }

  /**
   * Returns the exif object for this file (if image)
   *
   * @return Exif
   */
  public function exif() {
    if(isset($this->cache['exif'])) return $this->cache['exif'];
    return $this->cache['exif'] = new Exif($this);
  }

  /**
   * Returns the PHP imagesize array
   *
   * @return array
   */
  public function imagesize() {
    return (array)getimagesize($this->root);
  }

  /**
   * Returns the dimensions of the file if possible
   *
   * @return Dimensions
   */
  public function dimensions() {

    if(isset($this->cache['dimensions'])) return $this->cache['dimensions'];

    if(in_array($this->mime(), array('image/jpeg', 'image/png', 'image/gif'))) {
      $size   = (array)getimagesize($this->root);
      $width  = a::get($size, 0, 0);
      $height = a::get($size, 1, 0);
    } else if($this->extension() == 'svg') {
      $content = $this->read();
      $xml     = simplexml_load_string($content);
      $attr    = $xml->attributes();  
      $width   = floatval($attr->width); 
      $height  = floatval($attr->height);
      if($width == 0 or $height == 0 and !empty($attr->viewBox)) {
        $box    = str::split($attr->viewBox, ' ');
        $width  = floatval(a::get($box, 2, 0));
        $height = floatval(a::get($box, 3, 0));
      }
    } else {
      $width  = 0;
      $height = 0;
    }

    return $this->cache['dimensions'] = new Dimensions($width, $height);

  }

  /**
   * Returns the width of the asset
   *
   * @return int
   */
  public function width() {
    return $this->dimensions()->width();
  }

  /**
   * Returns the height of the asset
   *
   * @return int
   */
  public function height() {
    return $this->dimensions()->height();
  }

  /**
   * Returns the ratio of the asset
   *
   * @return int
   */
  public function ratio() {
    return $this->dimensions()->ratio();
  }

  /**
   * Checks if the dimensions of the asset are portrait
   *
   * @return boolean
   */
  public function isPortrait() {
    return $this->dimensions()->portrait();
  }

  /**
   * Checks if the dimensions of the asset are landscape
   *
   * @return boolean
   */
  public function isLandscape() {
    return $this->dimensions()->landscape();
  }

  /**
   * Checks if the dimensions of the asset are square
   *
   * @return boolean
   */
  public function isSquare() {
    return $this->dimensions()->square();
  }

  /**
   * Returns the orientation as string
   * landscape | portrait | square
   *
   * @return string
   */
  public function orientation() {
    return $this->dimensions()->orientation();
  }

  /**
   * @param array $attr
   * @return string
   */
  public function html($attr = array()) {

    if($this->type() != 'image') return false;

    $img = new Brick('img');
    $img->attr('src', $this->url());
    $img->attr('alt', ' ');

    if(is_string($attr) || (is_object($attr) && method_exists($attr, '__toString'))) {
      $img->attr('alt', (string)$attr);
    } else if(is_array($attr)) {
      $img->attr($attr);      
    }

    return $img;

  }

  /**
   * Scales the image if possible
   * 
   * @param int $width
   * @param mixed $height
   * @param mixed $quality
   * @return Media
   */
  public function resize($width, $height = null, $quality = null) {

    if($this->type() != 'image') return $this;

    $params = array('width' => $width);

    if($height)  $params['height']  = $height;
    if($quality) $params['quality'] = $quality;

    return new Thumb($this, $params);

  }

  /**
   * Scales and crops the image if possible
   * 
   * @param int $width
   * @param mixed $height
   * @param mixed $quality
   * @return Media
   */
  public function crop($width, $height = null, $quality = null) {

    if($this->type() != 'image') return $this;

    $params = array('width' => $width, 'crop' => true);

    if($height)  $params['height']  = $height;
    if($quality) $params['quality'] = $quality;

    return new Thumb($this, $params);

  }

  /**
   * Converts the media object to a 
   * plain PHP array
   * 
   * @param closure $callback 
   * @return array
   */
  public function toArray($callback = null) {

    $data = array(
      'root'       => $this->root(),
      'url'        => $this->url(),
      'hash'       => $this->hash(),
      'dir'        => $this->dir(),
      'filename'   => $this->filename(),
      'name'       => $this->name(),
      'safeName'   => $this->safeName(),
      'extension'  => $this->extension(),
      'size'       => $this->size(),
      'niceSize'   => $this->niceSize(),
      'modified'   => $this->modified(),
      'mime'       => $this->mime(),
      'type'       => $this->type(),
      'dimensions' => $this->dimensions()->toArray()
    );


    if(is_null($callback)) {
      return $data;
    } else {
      return array_map($callback, $data);
    }

  }

  /**
   * Converts the entire file array into 
   * a json string
   * 
   * @param closure $callback Filter callback
   * @return string
   */
  public function toJson($callback = null) {
    return json_encode($this->toArray($callback));
  }

  /**
   * Returns a full link to this file
   * Perfect for debugging in connection with echo
   *
   * @return string
   */
  public function __toString() {
    return $this->root;
  }

}