<?php
// SPDX-License-Identifier: GPL-2.0-or-later
// Local image manipulation, uses WP_Image_Editor (Imagick or GD fallback).
// Also: download-to-temp helper for Replicate output URLs.

if (!defined('ABSPATH')) { exit; }

class Acpimg_Image_Tools {

	// Download a remote URL to a temp file. Returns local path or WP_Error.
	public static function download($url) {
		require_once ABSPATH . 'wp-admin/includes/file.php';
		$tmp = download_url($url, 60);
		if (is_wp_error($tmp)) return $tmp;
		return $tmp;
	}

	// Crop to a target aspect ratio, subject-aware (centered fallback if no mask).
	public static function crop_to_aspect($source_path, $ratio = '1:1', $subject_bbox = null) {
		$editor = wp_get_image_editor($source_path);
		if (is_wp_error($editor)) return $editor;
		$size = $editor->get_size();
		list($num, $den) = array_map('floatval', explode(':', $ratio));
		$target_w_h = $num / $den;
		$src_w = $size['width'];
		$src_h = $size['height'];
		if ($subject_bbox) {
			// bbox = [x,y,w,h] in source pixels. Expand to ratio.
			list($x, $y, $w, $h) = $subject_bbox;
			$cx = $x + $w / 2;
			$cy = $y + $h / 2;
			$want_w = max($w, $h * $target_w_h);
			$want_h = $want_w / $target_w_h;
			$nx = max(0, min($src_w - $want_w, $cx - $want_w / 2));
			$ny = max(0, min($src_h - $want_h, $cy - $want_h / 2));
			$editor->crop((int) $nx, (int) $ny, (int) $want_w, (int) $want_h);
		} else {
			// centered crop.
			$src_ratio = $src_w / $src_h;
			if ($src_ratio > $target_w_h) {
				$new_w = (int) ($src_h * $target_w_h);
				$nx = (int) (($src_w - $new_w) / 2);
				$editor->crop($nx, 0, $new_w, $src_h);
			} else {
				$new_h = (int) ($src_w / $target_w_h);
				$ny = (int) (($src_h - $new_h) / 2);
				$editor->crop(0, $ny, $src_w, $new_h);
			}
		}
		return $editor;
	}

	// Save an in-memory editor to the WP uploads dir, return [url, path].
	public static function save_as($editor, $filename, $mime = 'image/jpeg', $quality = 88) {
		$uploads = wp_upload_dir();
		$dir = trailingslashit($uploads['path']) . 'acpimg';
		if (!is_dir($dir)) wp_mkdir_p($dir);
		$path = $dir . '/' . $filename;
		$editor->set_quality($quality);
		$saved = $editor->save($path, $mime);
		if (is_wp_error($saved)) return $saved;
		$url = trailingslashit($uploads['url']) . 'acpimg/' . $filename;
		return ['url' => $url, 'path' => $saved['path']];
	}

	// Quick filetype check by extension.
	public static function ext($path) {
		return strtolower(pathinfo($path, PATHINFO_EXTENSION));
	}

	public static function is_webp_or_avif($path_or_url) {
		$ext = self::ext($path_or_url);
		return in_array($ext, ['webp', 'avif'], true);
	}
}