<?php

namespace XcVm\Core\Util;

use XcVm\Core\Config\SettingsManager;
use XcVm\Domain\Server\ServerRepository;

/**
 * ImageUtils — image utils
 *
 * @package XC_VM_Core_Util
 * @author  Divarion_D <https://github.com/Divarion-D>
 * @copyright 2025-2026 Vateron Media
 * @link    https://github.com/Vateron-Media/XC_VM
 * @license AGPL-3.0 https://www.gnu.org/licenses/agpl-3.0.html
 */

class ImageUtils {
	/**
	 * Resolve an image URL, expanding internal `s:<serverId>:` references.
	 *
	 * @param string|null $rURL           Image URL or internal `s:` reference; null/empty (a stream,
	 *                                    movie or series without an image — the columns are
	 *                                    nullable) resolves to ''.
	 * @param string|null $rForceProtocol Force http/https when resolving server URLs.
	 * @return string Resolved public URL ('' if there is none or the server cannot be resolved).
	 */
	public static function validateURL(?string $rURL = null, ?string $rForceProtocol = null): string {
		if (empty($rURL)) {
			return '';
		}
		if (substr($rURL, 0, 2) == 's:') {
			$rSplit = explode(':', $rURL, 3);
			$rServerURL = ServerRepository::getPublicURL(intval($rSplit[1]), $rForceProtocol);
			if ($rServerURL) {
				return $rServerURL . 'images/' . basename($rURL);
			}
			return '';
		}
		return $rURL;
	}

	/**
	 * Download a remote image into the local image cache.
	 *
	 * Stores jpg/jpeg/png images and returns an internal `s:<serverId>:` reference;
	 * returns the original URL unchanged when not downloadable.
	 *
	 * @param string|null $rImage Remote image URL; callers pass optional columns
	 *                            (an icon, a backdrop), so it may be null.
	 * @param int|null    $rType  Optional stream type (unused placeholder).
	 * @return string|null Internal `s:` reference, or $rImage unchanged.
	 */
	public static function downloadImage(?string $rImage, ?int $rType = null) {
		if ((string) $rImage !== '' && substr(strtolower($rImage), 0, 4) == 'http') {
			$rPathInfo = pathinfo(parse_url($rImage, PHP_URL_PATH) ?: $rImage);
			$rExt = strtolower($rPathInfo['extension'] ?? '');
			if (!$rExt) {
				$rImageInfo = @getimagesize($rImage);
				if (is_array($rImageInfo) && !empty($rImageInfo['mime']) && strpos($rImageInfo['mime'], '/') !== false) {
					list(, $rExt) = explode('/', strtolower($rImageInfo['mime']), 2);
				}
			}
			if (in_array(strtolower($rExt), ['jpg', 'jpeg', 'png'])) {
				$rFilename = Encryption::encrypt($rImage, SettingsManager::get('live_streaming_pass'), OPENSSL_EXTRA);
				// A single filename component is capped at 255 bytes on ext4/most
				// filesystems. Long source URLs produce an encrypted name that
				// exceeds this, so file_put_contents fails with "File name too
				// long" and the whole import (e.g. Plex Sync) stalls. Fall back to
				// a deterministic hash for those — the tools-images self-heal can't
				// reverse a hash, but the image still downloads and caches. The
				// "h_" prefix marks these so the self-heal can skip them.
				if (strlen($rFilename . '.' . $rExt) > 250) {
					$rFilename = 'h_' . hash('sha256', $rImage);
				}
				$rPrevPath = IMAGES_PATH . $rFilename . '.' . $rExt;
				if (file_exists($rPrevPath)) {
					return 's:' . SERVER_ID . ':/images/' . $rFilename . '.' . $rExt;
				}
				$rCurl = curl_init();
				curl_setopt($rCurl, CURLOPT_URL, $rImage);
				curl_setopt($rCurl, CURLOPT_RETURNTRANSFER, true);
				curl_setopt($rCurl, CURLOPT_CONNECTTIMEOUT, 5);
				curl_setopt($rCurl, CURLOPT_TIMEOUT, 5);
				$rData = curl_exec($rCurl);
				if ((string) $rData !== '') {
					$rPath = IMAGES_PATH . $rFilename . '.' . $rExt;
					// The images cache dir may not exist yet on a given node (e.g. an
					// LB running the watch import), so file_put_contents would fail
					// with ENOENT. Ensure the directory exists before writing.
					if (!is_dir(IMAGES_PATH)) {
						@mkdir(IMAGES_PATH, 0775, true);
					}
					@file_put_contents($rPath, $rData);
					if (file_exists($rPath)) {
						return 's:' . SERVER_ID . ':/images/' . $rFilename . '.' . $rExt;
					}
				}
			}
		}
		return $rImage;
	}

	/**
	 * Compute dimensions that fit within a bounding box, preserving aspect ratio.
	 *
	 * @param int $origWidth  Original width.
	 * @param int $origHeight Original height.
	 * @param int $maxWidth   Max width (0 = no limit).
	 * @param int $maxHeight  Max height (0 = no limit).
	 * @return array ['width' => int, 'height' => int].
	 */
	public static function getImageSizeKeepAspectRatio(int $origWidth, int $origHeight, int $maxWidth, int $maxHeight) {
		if ($maxWidth == 0) {
			$maxWidth = $origWidth;
		}
		if ($maxHeight == 0) {
			$maxHeight = $origHeight;
		}
		$widthRatio = $maxWidth / (($origWidth ?: 1));
		$heightRatio = $maxHeight / (($origHeight ?: 1));
		$ratio = min($widthRatio, $heightRatio);
		if ($ratio < 1) {
			$newWidth = $origWidth * $ratio;
			$newHeight = $origHeight * $ratio;
		} else {
			$newHeight = $origHeight;
			$newWidth = $origWidth;
		}
		return ['height' => round($newHeight, 0), 'width' => round($newWidth, 0)];
	}

	/**
	 * Determine whether a string is an absolute URL.
	 *
	 * @param string $rURL Candidate URL.
	 * @return bool True if absolute.
	 */
	public static function isAbsoluteUrl(string $rURL) {
		$rPattern = "/^(?:ftp|https?|feed)?:?\\/\\/(?:(?:(?:[\\w\\.\\-\\+!\$&'\\(\\)*\\+,;=]|%[0-9a-f]{2})+:)*" . "\n" . "        (?:[\\w\\.\\-\\+%!\$&'\\(\\)*\\+,;=]|%[0-9a-f]{2})+@)?(?:" . "\n" . '        (?:[a-z0-9\\-\\.]|%[0-9a-f]{2})+|(?:\\[(?:[0-9a-f]{0,4}:)*(?:[0-9a-f]{0,4})\\]))(?::[0-9]+)?(?:[\\/|\\?]' . "\n" . "        (?:[\\w#!:\\.\\?\\+\\|=&@\$'~*,;\\/\\(\\)\\[\\]\\-]|%[0-9a-f]{2})*)?\$/xi";
		return (bool) preg_match($rPattern, $rURL);
	}
}