<?php

namespace Code\Photo;

use function imagejpeg;
use function imagepng;
use function imagewebp;

/**
 * @brief GD photo driver.
 *
 */

class PhotoGd extends PhotoDriver
{

    /**
     * {@inheritDoc}
     * @see \Code\Photo\PhotoDriver::supportedTypes()
     */
    public function supportedTypes()
    {
        $t = [];
        $t['image/jpeg'] = 'jpg';
        if (imagetypes() & IMG_PNG) {
            $t['image/png'] = 'png';
        }
        if (imagetypes() & IMG_GIF) {
            $t['image/gif'] = 'gif';
        }
        if (imagetypes() & IMG_WEBP) {
            $t['image/webp'] = 'webp';
        }

        return $t;
    }

    protected function load($data, $type)
    {
        $this->valid = false;
        if (! $data) {
            return;
        }

        $this->image = @imagecreatefromstring($data);

        if ($this->image !== false) {
            $this->valid  = true;
            $this->setDimensions();
            imagealphablending($this->image, false);
            imagesavealpha($this->image, true);
        } else {
            logger('image load failed');
        }
    }

    protected function setDimensions()
    {
        $this->width  = imagesx($this->image);
        $this->height = imagesy($this->image);
    }

    /**
     * @brief GD driver does not preserve EXIF, so not need to clear it.
     *
     * @return void
     */
    public function clearexif()
    {
        return;
    }

    protected function destroy()
    {
        if ($this->is_valid()) {
            imagedestroy($this->image);
        }
    }

    /**
     * @brief Return a PHP image resource of the current image.
     *
     * @see \Code\Photo\PhotoDriver::getImage()
     *
     * @return bool|resource
     */
    public function getImage()
    {
        if (! $this->is_valid()) {
            return false;
        }

        return $this->image;
    }

    public function doScaleImage($dest_width, $dest_height)
    {

        $dest = imagecreatetruecolor($dest_width, $dest_height);
        $width = imagesx($this->image);
        $height = imagesy($this->image);

        imagealphablending($dest, false);
        imagesavealpha($dest, true);
        if ($this->type == 'image/png') {
            imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
        }
        imagecopyresampled($dest, $this->image, 0, 0, 0, 0, $dest_width, $dest_height, $width, $height);
        if ($this->image) {
            imagedestroy($this->image);
        }

        $this->image = $dest;
        $this->setDimensions();
    }

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

        $this->image = imagerotate($this->image, $degrees, 0);
        $this->setDimensions();
    }

    public function flip($horiz = true, $vert = false)
    {
        if (! $this->is_valid()) {
            return false;
        }

        $w = imagesx($this->image);
        $h = imagesy($this->image);
        $flipped = imagecreate($w, $h);
        if ($horiz) {
            for ($x = 0; $x < $w; $x++) {
                imagecopy($flipped, $this->image, $x, 0, $w - $x - 1, 0, 1, $h);
            }
        }
        if ($vert) {
            for ($y = 0; $y < $h; $y++) {
                imagecopy($flipped, $this->image, 0, $y, 0, $h - $y - 1, $w, 1);
            }
        }
        $this->image = $flipped;
        $this->setDimensions(); // Shouldn't really be necessary
    }

    public function cropImageRect($maxx, $maxy, $x, $y, $w, $h)
    {
        if (! $this->is_valid()) {
            return false;
        }

        $dest = imagecreatetruecolor($maxx, $maxy);
        imagealphablending($dest, false);
        imagesavealpha($dest, true);
        if ($this->type == 'image/png') {
            imagefill($dest, 0, 0, imagecolorallocatealpha($dest, 0, 0, 0, 127)); // fill with alpha
        }
        imagecopyresampled($dest, $this->image, 0, 0, $x, $y, $maxx, $maxy, $w, $h);
        if ($this->image) {
            imagedestroy($this->image);
        }
        $this->image = $dest;
        $this->setDimensions();
    }

    /**
     * {@inheritDoc}
     * @see \Code\Photo\PhotoDriver::imageString()
     */
    public function imageString($animated = true)
    {
        if (! $this->is_valid()) {
            return false;
        }

        $quality = false;

        ob_start();

        switch ($this->getType()) {
            case 'image/webp':
                imagewebp($this->image);
                break;

            case 'image/png':
                $quality = get_config('system', 'png_quality');
                if ((! $quality) || ($quality > 9)) {
                    $quality = PNG_QUALITY;
                }

                imagepng($this->image, null, $quality);
                break;
            case 'image/jpeg':
            // gd can lack imagejpeg(), but we verify during installation it is available
            default:
                $quality = get_config('system', 'jpeg_quality');
                if ((! $quality) || ($quality > 100)) {
                    $quality = JPEG_QUALITY;
                }

                imagejpeg($this->image, null, $quality);
                break;
        }
        $string = ob_get_contents();
        ob_end_clean();

        return $string;
    }
}