<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         4.0.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\Routing;

use Cake\Core\Configure;
use Cake\Core\Plugin;
use Cake\Utility\Inflector;

/**
 * Class for generating asset URLs.
 */
class Asset
{
    /**
     * Inflection type.
     *
     * @var string
     */
    protected static $inflectionType = 'underscore';

    /**
     * Set inflection type to use when inflecting plugin/theme name.
     *
     * @param string $inflectionType Inflection type. Value should be a valid
     *  method name of `Inflector` class like `'dasherize'` or `'underscore`'`.
     * @return void
     */
    public static function setInflectionType(string $inflectionType): void
    {
        static::$inflectionType = $inflectionType;
    }

    /**
     * Generates URL for given image file.
     *
     * Depending on options passed provides full URL with domain name. Also calls
     * `Asset::assetTimestamp()` to add timestamp to local files.
     *
     * @param string $path Path string.
     * @param array $options Options array. Possible keys:
     *   `fullBase` Return full URL with domain name
     *   `pathPrefix` Path prefix for relative URLs
     *   `plugin` False value will prevent parsing path as a plugin
     *   `timestamp` Overrides the value of `Asset.timestamp` in Configure.
     *        Set to false to skip timestamp generation.
     *        Set to true to apply timestamps when debug is true. Set to 'force' to always
     *        enable timestamping regardless of debug value.
     * @return string Generated URL
     */
    public static function imageUrl(string $path, array $options = []): string
    {
        $pathPrefix = Configure::read('App.imageBaseUrl');

        return static::url($path, $options + compact('pathPrefix'));
    }

    /**
     * Generates URL for given CSS file.
     *
     * Depending on options passed provides full URL with domain name. Also calls
     * `Asset::assetTimestamp()` to add timestamp to local files.
     *
     * @param string $path Path string.
     * @param array $options Options array. Possible keys:
     *   `fullBase` Return full URL with domain name
     *   `pathPrefix` Path prefix for relative URLs
     *   `ext` Asset extension to append
     *   `plugin` False value will prevent parsing path as a plugin
     *   `timestamp` Overrides the value of `Asset.timestamp` in Configure.
     *        Set to false to skip timestamp generation.
     *        Set to true to apply timestamps when debug is true. Set to 'force' to always
     *        enable timestamping regardless of debug value.
     * @return string Generated URL
     */
    public static function cssUrl(string $path, array $options = []): string
    {
        $pathPrefix = Configure::read('App.cssBaseUrl');
        $ext = '.css';

        return static::url($path, $options + compact('pathPrefix', 'ext'));
    }

    /**
     * Generates URL for given javascript file.
     *
     * Depending on options passed provides full URL with domain name. Also calls
     * `Asset::assetTimestamp()` to add timestamp to local files.
     *
     * @param string $path Path string.
     * @param array $options Options array. Possible keys:
     *   `fullBase` Return full URL with domain name
     *   `pathPrefix` Path prefix for relative URLs
     *   `ext` Asset extension to append
     *   `plugin` False value will prevent parsing path as a plugin
     *   `timestamp` Overrides the value of `Asset.timestamp` in Configure.
     *        Set to false to skip timestamp generation.
     *        Set to true to apply timestamps when debug is true. Set to 'force' to always
     *        enable timestamping regardless of debug value.
     * @return string Generated URL
     */
    public static function scriptUrl(string $path, array $options = []): string
    {
        $pathPrefix = Configure::read('App.jsBaseUrl');
        $ext = '.js';

        return static::url($path, $options + compact('pathPrefix', 'ext'));
    }

    /**
     * Generates URL for given asset file.
     *
     * Depending on options passed provides full URL with domain name. Also calls
     * `Asset::assetTimestamp()` to add timestamp to local files.
     *
     * ### Options:
     *
     * - `fullBase` Boolean true or a string (e.g. https://example) to
     *    return full URL with protocol and domain name.
     * - `pathPrefix` Path prefix for relative URLs
     * - `ext` Asset extension to append
     * - `plugin` False value will prevent parsing path as a plugin
     * - `theme` Optional theme name
     * - `timestamp` Overrides the value of `Asset.timestamp` in Configure.
     *    Set to false to skip timestamp generation.
     *    Set to true to apply timestamps when debug is true. Set to 'force' to always
     *    enable timestamping regardless of debug value.
     *
     * @param string $path Path string or URL array
     * @param array $options Options array.
     * @return string Generated URL
     */
    public static function url(string $path, array $options = []): string
    {
        if (preg_match('/^data:[a-z]+\/[a-z]+;/', $path)) {
            return $path;
        }

        if (strpos($path, '://') !== false || preg_match('/^[a-z]+:/i', $path)) {
            return ltrim(Router::url($path), '/');
        }

        if (!array_key_exists('plugin', $options) || $options['plugin'] !== false) {
            [$plugin, $path] = static::pluginSplit($path);
        }
        if (!empty($options['pathPrefix']) && $path[0] !== '/') {
            $pathPrefix = $options['pathPrefix'];
            $placeHolderVal = '';
            if (!empty($options['theme'])) {
                $placeHolderVal = static::inflectString($options['theme']) . '/';
            } elseif (isset($plugin)) {
                $placeHolderVal = static::inflectString($plugin) . '/';
            }

            $path = str_replace('{plugin}', $placeHolderVal, $pathPrefix) . $path;
        }
        if (
            !empty($options['ext']) &&
            strpos($path, '?') === false &&
            substr($path, -strlen($options['ext'])) !== $options['ext']
        ) {
            $path .= $options['ext'];
        }

        // Check again if path has protocol as `pathPrefix` could be for CDNs.
        if (preg_match('|^([a-z0-9]+:)?//|', $path)) {
            return Router::url($path);
        }

        if (isset($plugin)) {
            $path = static::inflectString($plugin) . '/' . $path;
        }

        $optionTimestamp = null;
        if (array_key_exists('timestamp', $options)) {
            $optionTimestamp = $options['timestamp'];
        }
        $webPath = static::assetTimestamp(
            static::webroot($path, $options),
            $optionTimestamp
        );

        $path = static::encodeUrl($webPath);

        if (!empty($options['fullBase'])) {
            $fullBaseUrl = is_string($options['fullBase'])
                ? $options['fullBase']
                : Router::fullBaseUrl();
            $path = rtrim($fullBaseUrl, '/') . '/' . ltrim($path, '/');
        }

        return $path;
    }

    /**
     * Encodes URL parts using rawurlencode().
     *
     * @param string $url The URL to encode.
     * @return string
     */
    protected static function encodeUrl(string $url): string
    {
        $path = parse_url($url, PHP_URL_PATH);
        if ($path === false) {
            $path = $url;
        }

        $parts = array_map('rawurldecode', explode('/', $path));
        $parts = array_map('rawurlencode', $parts);
        $encoded = implode('/', $parts);

        return str_replace($path, $encoded, $url);
    }

    /**
     * Adds a timestamp to a file based resource based on the value of `Asset.timestamp` in
     * Configure. If Asset.timestamp is true and debug is true, or Asset.timestamp === 'force'
     * a timestamp will be added.
     *
     * @param string $path The file path to timestamp, the path must be inside `App.wwwRoot` in Configure.
     * @param bool|string $timestamp If set will overrule the value of `Asset.timestamp` in Configure.
     * @return string Path with a timestamp added, or not.
     */
    public static function assetTimestamp(string $path, $timestamp = null): string
    {
        if (strpos($path, '?') !== false) {
            return $path;
        }

        if ($timestamp === null) {
            $timestamp = Configure::read('Asset.timestamp');
        }
        $timestampEnabled = $timestamp === 'force' || ($timestamp === true && Configure::read('debug'));
        if ($timestampEnabled) {
            $filepath = preg_replace(
                '/^' . preg_quote(static::requestWebroot(), '/') . '/',
                '',
                urldecode($path)
            );
            $webrootPath = Configure::read('App.wwwRoot') . str_replace('/', DIRECTORY_SEPARATOR, $filepath);
            if (is_file($webrootPath)) {
                return $path . '?' . filemtime($webrootPath);
            }
            // Check for plugins and org prefixed plugins.
            $segments = explode('/', ltrim($filepath, '/'));
            $plugin = Inflector::camelize($segments[0]);
            if (!Plugin::isLoaded($plugin) && count($segments) > 1) {
                $plugin = implode('/', [$plugin, Inflector::camelize($segments[1])]);
                unset($segments[1]);
            }
            if (Plugin::isLoaded($plugin)) {
                unset($segments[0]);
                $pluginPath = Plugin::path($plugin)
                    . 'webroot'
                    . DIRECTORY_SEPARATOR
                    . implode(DIRECTORY_SEPARATOR, $segments);
                if (is_file($pluginPath)) {
                    return $path . '?' . filemtime($pluginPath);
                }
            }
        }

        return $path;
    }

    /**
     * Checks if a file exists when theme is used, if no file is found default location is returned.
     *
     * ### Options:
     *
     * - `theme` Optional theme name
     *
     * @param string $file The file to create a webroot path to.
     * @param array $options Options array.
     * @return string Web accessible path to file.
     */
    public static function webroot(string $file, array $options = []): string
    {
        $options += ['theme' => null];
        $requestWebroot = static::requestWebroot();

        $asset = explode('?', $file);
        $asset[1] = isset($asset[1]) ? '?' . $asset[1] : '';
        $webPath = $requestWebroot . $asset[0];
        $file = $asset[0];

        $themeName = $options['theme'];
        if ($themeName) {
            $file = trim($file, '/');
            $theme = static::inflectString($themeName) . '/';

            if (DIRECTORY_SEPARATOR === '\\') {
                $file = str_replace('/', '\\', $file);
            }

            if (is_file(Configure::read('App.wwwRoot') . $theme . $file)) {
                $webPath = $requestWebroot . $theme . $asset[0];
            } else {
                $themePath = Plugin::path($themeName);
                $path = $themePath . 'webroot/' . $file;
                if (is_file($path)) {
                    $webPath = $requestWebroot . $theme . $asset[0];
                }
            }
        }
        if (strpos($webPath, '//') !== false) {
            return str_replace('//', '/', $webPath . $asset[1]);
        }

        return $webPath . $asset[1];
    }

    /**
     * Inflect the theme/plugin name to type set using `Asset::setInflectionType()`.
     *
     * @param string $string String inflected.
     * @return string Inflected name of the theme
     */
    protected static function inflectString(string $string): string
    {
        return Inflector::{static::$inflectionType}($string);
    }

    /**
     * Get webroot from request.
     *
     * @return string
     */
    protected static function requestWebroot(): string
    {
        $request = Router::getRequest();
        if ($request === null) {
            return '/';
        }

        return $request->getAttribute('webroot');
    }

    /**
     * Splits a dot syntax plugin name into its plugin and filename.
     * If $name does not have a dot, then index 0 will be null.
     * It checks if the plugin is loaded, else filename will stay unchanged for filenames containing dot.
     *
     * @param string $name The name you want to plugin split.
     * @return array Array with 2 indexes. 0 => plugin name, 1 => filename.
     * @psalm-return array{string|null, string}
     */
    protected static function pluginSplit(string $name): array
    {
        $plugin = null;
        [$first, $second] = pluginSplit($name);
        if ($first && Plugin::isLoaded($first)) {
            $name = $second;
            $plugin = $first;
        }

        return [$plugin, $name];
    }
}
