<?php

namespace Automad\Core;

use Automad\Models\Page;

/**
 * The Resolve class holds all methods to modulate URLs and file paths.
 * Since all page URLs are not URLs to real directories, all non-absolute links and file paths have to be resolved,
 * to point to a valid location.
 * For example a relative file name to an image wouldn't be a valid link, since the URL of the page is not
 * the real file system path to the page's files.
 *
 * @author Marc Anton Dahmen
 * @copyright Copyright (c) 2013-2023 by Marc Anton Dahmen - https://marcdahmen.de
 * @license MIT license - https://automad.org/license
 */
class Resolve
{
	/**
	 * Resolve absolute URLs (starting with a slash) to the domain.
	 *
	 * Example:
	 * /page -> https://domain/base-url/index.php/page or
	 * /page -> https://domain/base-url/page
	 *
	 * @param string $url
	 * @return string The resolved URL
	 */
	public static function absoluteUrlToDomain(string $url): string
	{
		return AM_SERVER . self::absoluteUrlToRoot($url);
	}


	/**
	 * Resolve absolute URLs (starting with a slash) to root in case Automad is installed within a subdirectory.
	 *
	 * Example:
	 * /page -> /base-url/index.php/page or
	 * /page -> /base-url/page
	 *
	 * @param string $url
	 * @return string The resolved URL
	 */
	public static function absoluteUrlToRoot(string $url): string
	{
		if (strpos($url, '//') === 0) {
			return $url;
		}

		// All URLs starting with only one slash.
		if (strpos($url, '/') === 0) {
			// Relative to root
			if (FileSystem::isAllowedFileType($url) || $url == '/' || strpos($url, '/?') === 0 || strpos($url, '/#') === 0) {
				// Skip adding a possible '/index.php' when linking to files and to the homepage
				// (possibly including a query string or anchor link),
				// also if rewriting is disabled.
				return AM_BASE_URL . $url;
			} else {
				return AM_BASE_INDEX . $url;
			}
		}

		return $url;
	}


	/**
	 * Resolve a file path or glob pattern according to its type (root relative or relative).
	 *
	 * If a file path begins with a '/', it is treated like a root relative path and the only AM_BASE_DIR gets prepended.
	 * In all other cases, the full path to the page gets prepended.
	 * For example a file called 'image.jpg' becomes '/basedir/pages/pagedir/image.jpg' and
	 * '/shared/image.jpg' becomes '/basedir/shared/image.jpg'.
	 *
	 * @param string $pagePath
	 * @param string $filePath
	 * @return string The resolved file path
	 */
	public static function filePath(string $pagePath, string $filePath): string
	{
		if (strpos($filePath, '/') === 0) {
			// Relative to root
			return AM_BASE_DIR . $filePath;
		}

		// Relative to page
		return AM_BASE_DIR . AM_DIR_PAGES . $pagePath . $filePath;
	}


	/**
	 * Resolve relative URLs (starting with a character or .) to be absolute URLs,
	 * using the base directory (where Automad is installed) as root.
	 *
	 * Example:
	 * image.png -> /pages/path/image.png or
	 * subpage   -> /parent/subpage or
	 * ../       -> /parent
	 *
	 * @param string $url
	 * @param Page $Page
	 * @return string The resolved URL
	 */
	public static function relativeUrlToBase(string $url, Page $Page): string
	{
		if (preg_match('/(\:\/\/|^[a-z]+\:)/is', $url)) {
			return $url;
		}

		// Check if $url is relative.
		if (preg_match('/^[\w\.]/', $url)) {
			if (FileSystem::isAllowedFileType($url)) {
				$url = AM_DIR_PAGES . $Page->path . $url;
			} else {
				// Even though all trailing slashes get stripped out of beauty reasons, any page must still be understood as a directory instead of a file.
				// Therefore it should be possible to link to a subpage with just href="subpage". Due to the missing trailing slash, that link would actually link to
				// a page called subpage, but being a sibling of the current page instead of really being a child.
				// Exampe:
				// The current page is "http://domain.com/page" and has a link href="subpage".
				// Just returning that link would reslove to "http://domain.com/subpage", which is wrong. It should be "http://domain.com/page/subpage".
				// Therefore resolving that URL is also necessary.
				$url = rtrim($Page->origUrl, '/') . '/' . $url;
			}

			// Resolve '../' and './'
			$parts = explode('/', $url);
			$resolvedParts = array();

			foreach ($parts as $part) {
				if ($part == '..') {
					array_pop($resolvedParts);
				} else {
					if ($part != '.') {
						$resolvedParts[] = $part;
					}
				}
			}

			$url = implode('/', $resolvedParts);

			// Remove slashes preceding query string or anchor links.
			$url = str_replace(array('/?', '/#'), array('?', '#'), $url);

			// Trim trailing slashes, but always keep a leading one.
			return '/' . trim($url, '/');
		}

		return $url;
	}
}
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