<?php

namespace Zotlabs\Photo;

use Zotlabs\Lib\Hashpath;

/**
 * @brief Abstract photo driver class.
 *
 * Inheritance seems not to be the best design pattern for such photo drivers.
 */
abstract class PhotoDriver {

	/**
	 * @brief This variable keeps the image.
	 *
	 * For GD it is a PHP image resource.
	 * For ImageMagick it is an \Imagick object.
	 *
	 * @var resource|\Imagick
	 */
	protected $image;

	/**
	 * @var integer
	 */
	protected $width;

	/**
	 * @var integer
	 */
	protected $height;

	/**
	 * @var boolean
	 */
	protected $valid;

	/**
	 * @brief The mimetype of the image.
	 *
	 * @var string
	 */
	protected $type;

	/**
	 * @brief Supported mimetypes by the used photo driver.
	 *
	 * @var array
	 */
	protected $types;

	/**
	 * @brief Return an array with supported mimetypes.
	 *
	 * @return array
	 *  Associative array with mimetype as key and file extension as value.
	 */
	abstract public function supportedTypes();

	abstract protected function load($data, $type);

	abstract protected function destroy();

	abstract protected function setDimensions();

	/**
	 * @brief Return the current image.
	 *
	 * @fixme Shouldn't his method be protected, because outside of the current
	 * driver it makes no sense at all because of the different return values.
	 *
	 * @return boolean|resource|\Imagick
	 *  false on failure, a PHP image resource for GD driver, an \Imagick object
	 *  for ImageMagick driver.
	 */
	abstract public function getImage();

	abstract public function doScaleImage($new_width, $new_height);

	abstract public function rotate($degrees);

	abstract public function flip($horiz = true, $vert = false);

	/**
	 * @brief Crops the image.
	 *
	 * @param int $maxx width of the new image
	 * @param int $maxy height of the new image
	 * @param int $x x-offset for region
	 * @param int $y y-offset for region
	 * @param int $w width of region
	 * @param int $h height of region
	 *
	 * @return boolean|void false on failure
	 */
	abstract public function cropImageRect($maxx, $maxy, $x, $y, $w, $h);

	/**
	 * @brief Return a binary string from the image resource.
	 *
	 * @return string A Binary String.
	 */
	abstract public function imageString();

	abstract public function clearexif();


	/**
	 * @brief PhotoDriver constructor.
	 *
	 * @param string $data Image
	 * @param string $type mimetype
	 */
	public function __construct($data, $type = '') {
		$this->types = $this->supportedTypes();
		if(! array_key_exists($type, $this->types)) {
			$type = 'image/jpeg';
		}
		$this->type = $type;
		$this->valid = false;
		$this->load($data, $type);
	}

	public function __destruct() {
		if($this->is_valid())
			$this->destroy();
	}

	/**
	 * @brief Is it a valid image object.
	 *
	 * @return boolean
	 */
	public function is_valid() {
		return $this->valid;
	}

	/**
	 * @brief Get the width of the image.
	 *
	 * @return boolean|number Width of image in pixels, or false on failure
	 */
	public function getWidth() {
		if(! $this->is_valid())
			return false;

		return $this->width;
	}

	/**
	 * @brief Get the height of the image.
	 *
	 * @return boolean|number Height of image in pixels, or false on failure
	 */
	public function getHeight() {
		if(! $this->is_valid())
			return false;

		return $this->height;
	}

	/**
	 * @brief Saves the image resource to a file in filesystem.
	 *
	 * @param string $path Path and filename where to save the image
	 * @return boolean False on failure, otherwise true
	 */
	public function saveImage($path) {
		if(! $this->is_valid())
			return false;

		return (file_put_contents($path, $this->imageString()) ? true : false);
	}

	/**
	 * @brief Return mimetype of the image resource.
	 *
	 * @return boolean|string False on failure, otherwise mimetype.
	 */
	public function getType() {
		if(! $this->is_valid())
			return false;

		return $this->type;
	}

	/**
	 * @brief Return file extension of the image resource.
	 *
	 * @return boolean|string False on failure, otherwise file extension.
	 */
	public function getExt() {
		if(! $this->is_valid())
			return false;

		return $this->types[$this->getType()];
	}

	/**
	 * @brief Scale image to max pixel size in either dimension.
	 *
	 * @param int $max maximum pixel size in either dimension
	 * @param boolean $float_height (optional)
	 *   If true allow height to float to any length on tall images, constraining
	 *   only the width
	 * @return boolean|void false on failure, otherwise void
	 */
	public function scaleImage($max, $float_height = true) {
		if(! $this->is_valid())
			return false;

		$width = $this->width;
		$height = $this->height;

		$dest_width = $dest_height = 0;

		if((! $width) || (! $height))
			return false;

		if($width > $max && $height > $max) {

			// very tall image (greater than 16:9)
			// constrain the width - let the height float.

			if(((($height * 9) / 16) > $width) && ($float_height)) {
				$dest_width = $max;
				$dest_height = intval(($height * $max) / $width);
			} // else constrain both dimensions
			elseif($width > $height) {
				$dest_width = $max;
				$dest_height = intval(($height * $max) / $width);
			} else {
				$dest_width = intval(($width * $max) / $height);
				$dest_height = $max;
			}
		} else {
			if($width > $max) {
				$dest_width = $max;
				$dest_height = intval(($height * $max) / $width);
			} else {
				if($height > $max) {

					// very tall image (greater than 16:9)
					// but width is OK - don't do anything

					if(((($height * 9) / 16) > $width) && ($float_height)) {
						$dest_width = $width;
						$dest_height = $height;
					} else {
						$dest_width = intval(($width * $max) / $height);
						$dest_height = $max;
					}
				} else {
					$dest_width = $width;
					$dest_height = $height;
				}
			}
		}
		$this->doScaleImage($dest_width, $dest_height);
	}

	public function scaleImageUp($min) {
		if(! $this->is_valid()) {
			return false;
		}

		$width = $this->width;
		$height = $this->height;

		$dest_width = $dest_height = 0;

		if((! $width) || (! $height))
			return false;

		if($width < $min && $height < $min) {
			if($width > $height) {
				$dest_width = $min;
				$dest_height = intval(($height * $min) / $width);
			} else {
				$dest_width = intval(($width * $min) / $height);
				$dest_height = $min;
			}
		} else {
			if($width < $min) {
				$dest_width = $min;
				$dest_height = intval(($height * $min) / $width);
			} else {
				if($height < $min) {
					$dest_width = intval(($width * $min) / $height);
					$dest_height = $min;
				} else {
					$dest_width = $width;
					$dest_height = $height;
				}
			}
		}
		$this->doScaleImage($dest_width, $dest_height);
	}

	/**
	 * @brief Scales image to a square.
	 *
	 * @param int $dim Pixel of square image
	 * @return boolean|void false on failure, otherwise void
	 */
	public function scaleImageSquare($dim) {
		if(! $this->is_valid())
			return false;

		$this->doScaleImage($dim, $dim);
	}

	/**
	 * @brief Crops a square image.
	 *
	 * @see cropImageRect()
	 *
	 * @param int $max size of the new image
	 * @param int $x x-offset for region
	 * @param int $y y-offset for region
	 * @param int $w width of region
	 * @param int $h height of region
	 *
	 * @return boolean|void false on failure
	 */
	public function cropImage($max, $x, $y, $w, $h) {
		if(! $this->is_valid())
			return false;

		$this->cropImageRect($max, $max, $x, $y, $w, $h);
	}

	/**
	 * @brief Reads exif data from a given filename.
	 *
	 * @param string $filename
	 * @return boolean|array
	 */
	public function exif($filename) {
		if((! function_exists('exif_read_data'))
				|| (! in_array($this->getType(), ['image/jpeg', 'image/tiff'])))
		{
			return false;
		}

		$f = @fopen($filename, 'rb');

		if($f) {
			// exif_read_data accepts a stream resource in php > 7.2
			$x = @exif_read_data($f, null, true);
			fclose($f);
			return $x;
		}

		return false;
	}

	/**
	 * @brief Orients current image based on exif orientation information.
	 *
	 * @param array $exif
	 * @return boolean true if oriented, otherwise false
	 */
	public function orient($exif) {
		if(! ($this->is_valid() && $exif)) {
			return false;
		}

		$ort = ((array_key_exists('IFD0', $exif)) ? $exif['IFD0']['Orientation'] : $exif['Orientation']);

		if(! $ort) {
			return false;
		}

		switch($ort) {
			case 1 : // nothing
				break;
			case 2 : // horizontal flip
				$this->flip();
				break;
			case 3 : // 180 rotate left
				$this->rotate(180);
				break;
			case 4 : // vertical flip
				$this->flip(false, true);
				break;
			case 5 : // vertical flip + 90 rotate right
				$this->flip(false, true);
				$this->rotate(-90);
				break;
			case 6 : // 90 rotate right
				$this->rotate(-90);
				break;
			case 7 : // horizontal flip + 90 rotate right
				$this->flip();
				$this->rotate(-90);
				break;
			case 8 : // 90 rotate left
				$this->rotate(90);
				break;
			default :
				break;
		}

		return true;
	}

	/**
	 * @brief Save photo to database.
	 *
	 * @param array $arr
	 * @param boolean $skipcheck (optional) default false
	 * @return boolean|array
	 */
	public function save($arr, $skipcheck = false) {
		if(! ($skipcheck || $this->is_valid())) {
			logger('Attempt to store invalid photo.');
			return false;
		}

		$p = [];

		$p['aid'] = $arr['aid'] ?? 0;
		$p['uid'] = $arr['uid'] ?? 0;
		$p['xchan'] = $arr['xchan'] ?? '';
		$p['resource_id'] = $arr['resource_id'] ?? '';
		$p['filename'] = $arr['filename'] ?? '';
		$p['mimetype'] = $arr['mimetype'] ?? $this->getType();
		$p['album'] = $arr['album'] ?? '';
		$p['imgscale'] = $arr['imgscale'] ?? 0;
		$p['allow_cid'] = $arr['allow_cid'] ?? '';
		$p['allow_gid'] = $arr['allow_gid'] ?? '';
		$p['deny_cid'] = $arr['deny_cid'] ?? '';
		$p['deny_gid'] = $arr['deny_gid'] ?? '';
		$p['edited'] = $arr['edited'] ?? datetime_convert();
		$p['title'] = $arr['title'] ?? '';
		$p['description'] = $arr['description'] ?? '';
		$p['photo_usage'] = $arr['photo_usage'] ?? PHOTO_NORMAL;
		$p['os_storage'] = $arr['os_storage'] ?? 1;
		$p['os_path'] = $arr['os_path'] ?? '';
		$p['os_syspath'] = $arr['os_syspath'] ?? '';
		$p['display_path'] = $arr['display_path'] ?? '';
		$p['width'] = $arr['width'] ?? $this->getWidth();
		$p['height'] = $arr['height'] ?? $this->getHeight();
		$p['expires'] = $arr['expires'] ?? gmdate('Y-m-d H:i:s', time() + get_config('system', 'photo_cache_time', 86400));
		$p['profile'] = $arr['profile'] ?? 0;

		if(! intval($p['imgscale']))
			logger('save: ' . print_r($arr, true), LOGGER_DATA);

		$x = q("select id, created from photo where resource_id = '%s' and uid = %d and xchan = '%s' and imgscale = %d limit 1", dbesc($p['resource_id']), intval($p['uid']), dbesc($p['xchan']), intval($p['imgscale']));

		if($x) {
			$p['created'] = $x['created'] ?? $p['edited'];
			$r = q("UPDATE photo set
				aid = %d,
				uid = %d,
				xchan = '%s',
				resource_id = '%s',
				created = '%s',
				edited = '%s',
				filename = '%s',
				mimetype = '%s',
				album = '%s',
				height = %d,
				width = %d,
				content = '%s',
				os_storage = %d,
				filesize = %d,
				imgscale = %d,
				photo_usage = %d,
				title = '%s',
				description = '%s',
				os_path = '%s',
				display_path = '%s',
				allow_cid = '%s',
				allow_gid = '%s',
				deny_cid = '%s',
				deny_gid = '%s',
				expires = '%s',
				profile = %d
				where id = %d",
			intval($p['aid']), intval($p['uid']), dbesc($p['xchan']), dbesc($p['resource_id']), dbescdate($p['created']), dbescdate($p['edited']), dbesc(basename($p['filename'])), dbesc($p['mimetype']), dbesc($p['album']), intval($p['height']), intval($p['width']), (intval($p['os_storage']) ? dbescbin($p['os_syspath']) : dbescbin($this->imageString())), intval($p['os_storage']), (intval($p['os_storage']) ? @filesize($p['os_syspath']) : strlen($this->imageString())), intval($p['imgscale']), intval($p['photo_usage']), dbesc($p['title']), dbesc($p['description']), dbesc($p['os_path']), dbesc($p['display_path']), dbesc($p['allow_cid']), dbesc($p['allow_gid']), dbesc($p['deny_cid']), dbesc($p['deny_gid']), dbescdate($p['expires']), intval($p['profile']), intval($x[0]['id']));
		} else {
			$p['created'] = $arr['created'] ?? $p['edited'];
			$r = q("INSERT INTO photo
				( aid, uid, xchan, resource_id, created, edited, filename, mimetype, album, height, width, content, os_storage, filesize, imgscale, photo_usage, title, description, os_path, display_path, allow_cid, allow_gid, deny_cid, deny_gid, expires, profile )
				VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d, %d, '%s', %d, %d, %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s', %d)", intval($p['aid']), intval($p['uid']), dbesc($p['xchan']), dbesc($p['resource_id']), dbescdate($p['created']), dbescdate($p['edited']), dbesc(basename($p['filename'])), dbesc($p['mimetype']), dbesc($p['album']), intval($p['height']), intval($p['width']), (intval($p['os_storage']) ? dbescbin($p['os_syspath']) : dbescbin($this->imageString())), intval($p['os_storage']), (intval($p['os_storage']) ? @filesize($p['os_syspath']) : strlen($this->imageString())), intval($p['imgscale']), intval($p['photo_usage']), dbesc($p['title']), dbesc($p['description']), dbesc($p['os_path']), dbesc($p['display_path']), dbesc($p['allow_cid']), dbesc($p['allow_gid']), dbesc($p['deny_cid']), dbesc($p['deny_gid']), dbescdate($p['expires']), intval($p['profile']));
		}
		logger('Photo save imgscale ' . $p['imgscale'] . ' returned: ' . (($r) ? 1 : 0));

		return $r;
	}

	/**
	 * @brief Stores thumbnail to database or filesystem.
	 *
	 * @param array $arr
	 * @param scale int
	 * @return boolean
	 */
	public function storeThumbnail($arr, $scale = 0) {

		// We only process thumbnails here
		if($scale == 0)
			return false;

		$arr['imgscale'] = $scale;

		if(boolval(get_config('system','photo_storage_type', 1))) {

			$arr['os_storage'] = 1;

			if (array_key_exists('uid', $arr) && ! in_array($scale, [ PHOTO_RES_PROFILE_300, PHOTO_RES_PROFILE_80, PHOTO_RES_PROFILE_48 ])) {
				$channel = channelx_by_n($arr['uid']);
				$arr['os_syspath'] = 'store/' . $channel['channel_address'] . '/' . $arr['os_path'] . '-' . $scale;
			}
			else
				$arr['os_syspath'] = Hashpath::path($arr['resource_id'], 'store/[data]/[xchan]', 2, 1) . '-' . $scale;

			if (! $this->saveImage($arr['os_syspath']))
				return false;
		}
		else
		    $arr['os_storage'] = 0;

		if(! $this->save($arr)) {
			if(array_key_exists('os_syspath', $arr))
				@unlink($arr['os_syspath']);
			return false;
		}

		return true;
	}

}