<?php

namespace LWVendor\PhpOffice\PhpSpreadsheet\Worksheet;

use GdImage;
use LWVendor\PhpOffice\PhpSpreadsheet\Exception;
use LWVendor\PhpOffice\PhpSpreadsheet\Shared\File;
class MemoryDrawing extends BaseDrawing
{
    // Rendering functions
    const RENDERING_DEFAULT = 'imagepng';
    const RENDERING_PNG = 'imagepng';
    const RENDERING_GIF = 'imagegif';
    const RENDERING_JPEG = 'imagejpeg';
    // MIME types
    const MIMETYPE_DEFAULT = 'image/png';
    const MIMETYPE_PNG = 'image/png';
    const MIMETYPE_GIF = 'image/gif';
    const MIMETYPE_JPEG = 'image/jpeg';
    const SUPPORTED_MIME_TYPES = [self::MIMETYPE_GIF, self::MIMETYPE_JPEG, self::MIMETYPE_PNG];
    /**
     * Image resource.
     *
     * @var null|GdImage|resource
     */
    private $imageResource;
    /**
     * Rendering function.
     *
     * @var string
     */
    private $renderingFunction;
    /**
     * Mime type.
     *
     * @var string
     */
    private $mimeType;
    /**
     * Unique name.
     *
     * @var string
     */
    private $uniqueName;
    /** @var null|resource */
    private $alwaysNull;
    /**
     * Create a new MemoryDrawing.
     */
    public function __construct()
    {
        // Initialise values
        $this->renderingFunction = self::RENDERING_DEFAULT;
        $this->mimeType = self::MIMETYPE_DEFAULT;
        $this->uniqueName = \md5(\mt_rand(0, 9999) . \time() . \mt_rand(0, 9999));
        $this->alwaysNull = null;
        // Initialize parent
        parent::__construct();
    }
    public function __destruct()
    {
        if ($this->imageResource) {
            $rslt = @\imagedestroy($this->imageResource);
            // "Fix" for Scrutinizer
            $this->imageResource = $rslt ? null : $this->alwaysNull;
        }
    }
    public function __clone()
    {
        parent::__clone();
        $this->cloneResource();
    }
    private function cloneResource() : void
    {
        if (!$this->imageResource) {
            return;
        }
        $width = (int) \imagesx($this->imageResource);
        $height = (int) \imagesy($this->imageResource);
        if (\imageistruecolor($this->imageResource)) {
            $clone = \imagecreatetruecolor($width, $height);
            if (!$clone) {
                throw new Exception('Could not clone image resource');
            }
            \imagealphablending($clone, \false);
            \imagesavealpha($clone, \true);
        } else {
            $clone = \imagecreate($width, $height);
            if (!$clone) {
                throw new Exception('Could not clone image resource');
            }
            // If the image has transparency...
            $transparent = \imagecolortransparent($this->imageResource);
            if ($transparent >= 0) {
                $rgb = \imagecolorsforindex($this->imageResource, $transparent);
                if (empty($rgb)) {
                    throw new Exception('Could not get image colors');
                }
                \imagesavealpha($clone, \true);
                $color = \imagecolorallocatealpha($clone, $rgb['red'], $rgb['green'], $rgb['blue'], $rgb['alpha']);
                if ($color === \false) {
                    throw new Exception('Could not get image alpha color');
                }
                \imagefill($clone, 0, 0, $color);
            }
        }
        //Create the Clone!!
        \imagecopy($clone, $this->imageResource, 0, 0, 0, 0, $width, $height);
        $this->imageResource = $clone;
    }
    /**
     * @param resource $imageStream Stream data to be converted to a Memory Drawing
     *
     * @throws Exception
     */
    public static function fromStream($imageStream) : self
    {
        $streamValue = \stream_get_contents($imageStream);
        if ($streamValue === \false) {
            throw new Exception('Unable to read data from stream');
        }
        return self::fromString($streamValue);
    }
    /**
     * @param string $imageString String data to be converted to a Memory Drawing
     *
     * @throws Exception
     */
    public static function fromString(string $imageString) : self
    {
        $gdImage = @\imagecreatefromstring($imageString);
        if ($gdImage === \false) {
            throw new Exception('Value cannot be converted to an image');
        }
        $mimeType = self::identifyMimeType($imageString);
        $renderingFunction = self::identifyRenderingFunction($mimeType);
        $drawing = new self();
        $drawing->setImageResource($gdImage);
        $drawing->setRenderingFunction($renderingFunction);
        $drawing->setMimeType($mimeType);
        return $drawing;
    }
    private static function identifyRenderingFunction(string $mimeType) : string
    {
        switch ($mimeType) {
            case self::MIMETYPE_PNG:
                return self::RENDERING_PNG;
            case self::MIMETYPE_JPEG:
                return self::RENDERING_JPEG;
            case self::MIMETYPE_GIF:
                return self::RENDERING_GIF;
        }
        return self::RENDERING_DEFAULT;
    }
    /**
     * @throws Exception
     */
    private static function identifyMimeType(string $imageString) : string
    {
        $temporaryFileName = File::temporaryFilename();
        \file_put_contents($temporaryFileName, $imageString);
        $mimeType = self::identifyMimeTypeUsingExif($temporaryFileName);
        if ($mimeType !== null) {
            \unlink($temporaryFileName);
            return $mimeType;
        }
        $mimeType = self::identifyMimeTypeUsingGd($temporaryFileName);
        if ($mimeType !== null) {
            \unlink($temporaryFileName);
            return $mimeType;
        }
        \unlink($temporaryFileName);
        return self::MIMETYPE_DEFAULT;
    }
    private static function identifyMimeTypeUsingExif(string $temporaryFileName) : ?string
    {
        if (\function_exists('exif_imagetype')) {
            $imageType = @\exif_imagetype($temporaryFileName);
            $mimeType = $imageType ? \image_type_to_mime_type($imageType) : null;
            return self::supportedMimeTypes($mimeType);
        }
        return null;
    }
    private static function identifyMimeTypeUsingGd(string $temporaryFileName) : ?string
    {
        if (\function_exists('getimagesize')) {
            $imageSize = @\getimagesize($temporaryFileName);
            if (\is_array($imageSize)) {
                $mimeType = $imageSize['mime'] ?? null;
                return self::supportedMimeTypes($mimeType);
            }
        }
        return null;
    }
    private static function supportedMimeTypes(?string $mimeType = null) : ?string
    {
        if (\in_array($mimeType, self::SUPPORTED_MIME_TYPES, \true)) {
            return $mimeType;
        }
        return null;
    }
    /**
     * Get image resource.
     *
     * @return null|GdImage|resource
     */
    public function getImageResource()
    {
        return $this->imageResource;
    }
    /**
     * Set image resource.
     *
     * @param GdImage|resource $value
     *
     * @return $this
     */
    public function setImageResource($value)
    {
        $this->imageResource = $value;
        if ($this->imageResource !== null) {
            // Get width/height
            $this->width = (int) \imagesx($this->imageResource);
            $this->height = (int) \imagesy($this->imageResource);
        }
        return $this;
    }
    /**
     * Get rendering function.
     *
     * @return string
     */
    public function getRenderingFunction()
    {
        return $this->renderingFunction;
    }
    /**
     * Set rendering function.
     *
     * @param string $value see self::RENDERING_*
     *
     * @return $this
     */
    public function setRenderingFunction($value)
    {
        $this->renderingFunction = $value;
        return $this;
    }
    /**
     * Get mime type.
     *
     * @return string
     */
    public function getMimeType()
    {
        return $this->mimeType;
    }
    /**
     * Set mime type.
     *
     * @param string $value see self::MIMETYPE_*
     *
     * @return $this
     */
    public function setMimeType($value)
    {
        $this->mimeType = $value;
        return $this;
    }
    /**
     * Get indexed filename (using image index).
     */
    public function getIndexedFilename() : string
    {
        $extension = \strtolower($this->getMimeType());
        $extension = \explode('/', $extension);
        $extension = $extension[1];
        return $this->uniqueName . $this->getImageIndex() . '.' . $extension;
    }
    /**
     * Get hash code.
     *
     * @return string Hash code
     */
    public function getHashCode()
    {
        return \md5($this->renderingFunction . $this->mimeType . $this->uniqueName . parent::getHashCode() . __CLASS__);
    }
}