<?php

/**
 * JCH Optimize - Performs several front-end optimizations for fast downloads
 *
 * @package   jchoptimize/core
 * @author    Samuel Marshall <samuel@jch-optimize.net>
 * @copyright Copyright (c) 2022 Samuel Marshall / JCH Optimize
 * @license   GNU/GPLv3, or later. See LICENSE file
 *
 *  If LICENSE file missing, see <http://www.gnu.org/licenses/>.
 */

namespace JchOptimize\Core\PageCache;

use _JchOptimizeVendor\V91\Joomla\DI\ContainerAwareInterface;
use _JchOptimizeVendor\V91\Joomla\DI\ContainerAwareTrait;
use _JchOptimizeVendor\V91\Joomla\Input\Input;
use _JchOptimizeVendor\V91\Laminas\Cache\Exception\ExceptionInterface;
use _JchOptimizeVendor\V91\Laminas\Cache\Storage\IterableInterface;
use _JchOptimizeVendor\V91\Laminas\Cache\Storage\StorageInterface;
use _JchOptimizeVendor\V91\Laminas\Cache\Storage\TaggableInterface;
use _JchOptimizeVendor\V91\Psr\Http\Message\UriInterface;
use _JchOptimizeVendor\V91\Psr\Log\LoggerAwareInterface;
use _JchOptimizeVendor\V91\Psr\Log\LoggerAwareTrait;
use Exception;
use JchOptimize\Core\Helper;
use JchOptimize\Core\Laminas\ClearExpiredByFactor;
use JchOptimize\Core\Model\CloudflarePurger;
use JchOptimize\Core\Platform\CacheInterface;
use JchOptimize\Core\Platform\HooksInterface;
use JchOptimize\Core\Platform\UtilityInterface;
use JchOptimize\Core\Registry;
use JchOptimize\Core\SystemUri;
use JchOptimize\Core\Uri\Uri;
use JchOptimize\Core\Uri\UriNormalizer;
use ReflectionClass;

use function array_slice;
use function date;
use function defined;
use function explode;
use function in_array;
use function is_null;
use function md5;
use function ob_end_clean;
use function preg_replace;
use function serialize;
use function str_replace;
use function time;
use function usort;

// phpcs:disable PSR1.Files.SideEffects
defined('_JCH_EXEC') or die('Restricted Access');

// phpcs:enable PSR1.Files.SideEffects

class PageCache implements ContainerAwareInterface, LoggerAwareInterface
{
    use ContainerAwareTrait;
    use LoggerAwareTrait;

    protected string $cacheId = '';

    protected string $adapter;

    protected bool $captureCacheEnabled = false;

    protected array $filters = [];

    protected array $lists = ['list_fullordering' => 'mtime ASC'];

    protected bool $enabled = true;

    protected bool $isCachingSet = false;

    public function __construct(
        protected Registry $params,
        protected Input $input,
        protected StorageInterface $pageCacheStorage,
        /**
         * @var StorageInterface&TaggableInterface&IterableInterface $taggableCache
         */
        protected $taggableCache,
        protected CacheInterface $cacheUtils,
        protected HooksInterface $hooks,
        protected UtilityInterface $utility,
        protected ?CloudflarePurger $cloudflarePurger = null
    ) {
        $reflection = new ReflectionClass($this->pageCacheStorage);
        $this->adapter = $reflection->getShortName();
    }

    public function setFilter(string $key, string $filter): void
    {
        $this->filters[$key] = $filter;
    }

    public function setList(string $key, string $list): void
    {
        $this->lists[$key] = $list;
    }

    /**
     * @return list<array{id:string, url:string, device:string, adapter:string, http-request:string, mtime:int}>
     * @throws ExceptionInterface
     */
    public function getItems(): array
    {
        $items = [];

        foreach ($this->taggableCache as $cacheItem) {
            $tags = $this->taggableCache->getTags($cacheItem);
            /** @var array{mtime:int} $metaData */
            $metaData = $this->taggableCache->getMetadata($cacheItem);

            if (empty($tags)) {
                continue;
            }

            if ($tags[0] != 'pagecache') {
                continue;
            }

            $url = $tags[1];

            $mtime = $metaData['mtime'];

            //Filter bu Time 1
            if (!empty($this->filters['filter_time-1'])) {
                if (time() < $mtime + (int)$this->filters['filter_time-1']) {
                    continue;
                }
            }

            //Filter by Time 2
            if (!empty($this->filters['filter_time-2'])) {
                if (time() >= $mtime + (int)$this->filters['filter_time-2']) {
                    continue;
                }
            }

            //Filter by URL
            if (!empty($this->filters['filter_search'])) {
                if (!str_contains($url, $this->filters['filter_search'])) {
                    continue;
                }
            }

            //Filter by device
            if (!empty($this->filters['filter_device'])) {
                if ($tags[2] != $this->filters['filter_device']) {
                    continue;
                }
            }

            //Filter by adapter
            if (!empty($this->filters['filter_adapter'])) {
                if (($tags[3] != $this->filters['filter_adapter'])) {
                    continue;
                }
            }

            $item = [];
            $item['id'] = $cacheItem;
            $item['url'] = $tags[1];
            $item['device'] = $tags[2];
            $item['adapter'] = $tags[3];
            $item['http-request'] = 'no';
            $item['mtime'] = $metaData['mtime'];

            $items[] = $item;
        }

        $this->sortItems($items, $this->lists['list_fullordering']);

        if (!empty($this->lists['list_limit'])) {
            $items = array_slice($items, 0, (int)$this->lists['list_limit']);
        }

        return $items;
    }

    /**
     * @param list<array{id:string, url:string, device:string, adapter:string, http-request:string, mtime:int}> $items
     * @param string $fullOrdering
     */
    protected function sortItems(array &$items, string $fullOrdering): void
    {
        [$orderBy, $dir] = explode(' ', $fullOrdering);

        usort($items, function ($a, $b) use ($orderBy, $dir) {
            if ($dir == 'ASC') {
                return $a[$orderBy] <=> $b[$orderBy];
            }

            return $b[$orderBy] <=> $a[$orderBy];
        });
    }

    public function store(string $html): string
    {
        if ($this->getCachingEnabled()) {
            $html = $this->tagHtml($html);

            $data = [
                'body' => $html,
                'headers' => $this->utility->getHeaders()
            ];

            try {
                //Save an empty page using the same id then tag it
                $this->taggableCache->setItem(
                    $this->cacheId,
                    '<html lang><head><title></title></head><body></body></html>'
                );
                $this->taggableCache->setTags(
                    $this->cacheId,
                    $this->getPageCacheTags()
                );
                //If tag successfully saved then save page cache
                if (!empty($this->taggableCache->getTags($this->cacheId))) {
                    $this->pageCacheStorage->setItem($this->cacheId, $data);
                }
            } catch (ExceptionInterface $e) {
                //$this->logger?->debug('Page Cache not saved:' . $e->getMessage());
            }
        } else {
            //Ensure Capture cache  doesn't cache either
            $this->captureCacheEnabled = false;
        }

        return $html;
    }

    /**
     * Returns the caching status if enabled or disabled.` If caching wasn't explicitly set it will be set on
     * first call to this function
     *
     * @return bool
     * @throws ExceptionInterface
     */
    public function getCachingEnabled(): bool
    {
        if (!$this->isCachingSet) {
            $this->setCaching();
        }

        //Disable page caching anytime clear expired plugin is running.
        return $this->enabled && !$this->pageCacheStorage->hasItem(ClearExpiredByFactor::getFlagId());
    }

    public function setCaching(): void
    {
        //just return false with this filter if you don't want the page to be cached
        if (!$this->hooks->onPageCacheSetCaching()) {
            $this->disableCaching();

            return;
        }

        if (
            $this->input->server->get('REQUEST_METHOD') == 'POST'
            || $this->input->cookie->get('jch_optimize_no_cache_user_activity') == 'user_posted_form'
        ) {
            $this->disableCaching();

            return;
        }

        $this->enabled = ($this->params->get('page_cache_select', 'jchpagecache')
            && $this->cacheUtils->isPageCacheEnabled($this->params)
            && $this->utility->isGuest()
            && !self::isExcluded($this->params)
            && $this->input->server->get('REQUEST_METHOD') === 'GET');

        $this->isCachingSet = true;
    }

    public function disableCaching(): void
    {
        $this->enabled = false;
        $this->isCachingSet = true;
    }

    protected function isExcluded(Registry $params): bool
    {
        //Exclude all hidden folders by default
        $cache_exclude = array_merge(['/.'], $params->get('cache_exclude', []));

        if (Helper::findExcludes($cache_exclude, (string)$this->getCurrentPage())) {
            return true;
        }

        return false;
    }

    public function getCurrentPage(): UriInterface
    {
        $pageUri = SystemUri::currentUri();
        /** @var string[] $ignoredQueries */
        $ignoredQueries = $this->params->get('page_cache_ignore_query_values', []);

        foreach ($ignoredQueries as $queryValue) {
            $pageUri = Uri::withoutQueryValue($pageUri, $queryValue);
        }

        return $pageUri;
    }

    public function tagHtml(string $html): string
    {
        if (JCH_DEBUG) {
            $now = date('l, F d, Y h:i:s A');
            $tag = "\n<!-- Cached by JCH Optimize on {$now} GMT -->\n</body>";
            $html = str_replace('</body>', $tag, $html);
        }

        return $html;
    }

    protected function getPageCacheTags(): array
    {
        $device = $this->utility->isMobile() ? 'Mobile' : 'Desktop';

        return ['pagecache', (string)$this->getCurrentPage(), $device, $this->adapter];
    }

    /**
     * @throws Exception
     */
    public function deleteCurrentPage(): void
    {
        $this->deleteItemsByUrls([$this->getCurrentPage()]);
    }

    /**
     * @throws Exception
     */
    public function deleteItemsByUrls(array $urls): void
    {
        $iterator = $this->taggableCache->getIterator();
        foreach ($iterator as $item) {
            $tags = $this->taggableCache->getTags($item);

            if (isset($tags[0]) && $tags[0] == 'pagecache' && in_array($tags[1], $urls)) {
                $this->deleteItemById($item);
            }
        }
    }

    public function deleteItemsByIds(array $ids): bool
    {
        $result = 1;
        $urls = [];

        foreach ($ids as $id) {
            $urls[] = $this->getUrlFromId($id);
            $result &= (int)$this->deleteItemById($id);
        }

        $this->cloudflarePurger?->purge($urls);

        return (bool)$result;
    }

    public function deleteItemById(string $id): bool
    {
        $result = 1;
        $tags = $this->taggableCache->getTags($id);

        if (!empty($tags) && $tags[3] != $this->adapter) {
            $this->getContainer()->get($tags[3])->removeItem($id);
            $result &= (int)!$this->container->get($tags[3])->hasItem($id);
        } else {
            $this->pageCacheStorage->removeItem($id);
            $result &= (int)!$this->pageCacheStorage->hasItem($id);
        }

        //Only delete tag if successful
        if ($result) {
            $this->taggableCache->removeItem($id);
        }

        return (bool)$result;
    }

    public function removeHtmlTag(string $html): ?string
    {
        $search = '#<!-- Cached by JCH Optimize on .*? GMT -->\n#';

        return preg_replace($search, '', $html);
    }

    public function initialize(): void
    {
        $this->setCaching();
        $this->cacheId = $this->getPageCacheId();

        if ($this->input->server->get('REQUEST_METHOD') == 'POST') {
            if ($this->params->get('page_cache_exclude_form_users', '1') && !empty($_POST)) {
                $this->hooks->onUserPostForm();

                if (!$this->input->cookie->get('jch_optimize_no_cache_user_activity') == 'user_posted_form') {
                    $options = [
                        'httponly' => true,
                        'expires' => time() + (int)$this->params->get('page_cache_lifetime', '900')
                    ];
                    $this->input->cookie->set('jch_optimize_no_cache_user_activity', 'user_posted_form', $options);
                }
            }

            return;
        }

        if (
            !$this->params->get('page_cache_exclude_form_users', '0')
            && $this->input->cookie->get('jch_optimize_no_cache_user_activity') == 'user_posted_form'
        ) {
            $this->hooks->onUserPostFormDeleteCookie();

            $this->input->cookie->set('jch_optimize_no_cache_user_activity', '', ['expires' => 1]);
        }
    }

    /**
     * @throws ExceptionInterface
     */
    public function outputPageCache(): void
    {
        if ($this->enabled) {
            /** @var array|null $data */
            $data = $this->pageCacheStorage->getItem($this->cacheId);
            $data = $this->cacheUtils->prepareDataFromCache($data);

            if (
                !is_null($data)
                && $this->input->cookie->get('jch_optimize_no_cache_user_activity') != 'user_posted_form'
            ) {
                if (!empty($data['body'])) {
                    $this->setCaptureCache($data['body']);
                }

                while (@ob_end_clean()) {
                }

                $this->disableCaching();
                $this->cacheUtils->outputData($data);
            }
        }
    }

    public function getPageCacheId(?UriInterface $currentUri = null): string
    {
        if ($currentUri === null) {
            $currentUri = $this->getCurrentPage();
        }

        //Add a value to the array that will be used to determine the page cache id
        $parts = $this->hooks->onPageCacheGetKey([]);

        $parts[] = $this->adapter;
        $parts[] = (string)UriNormalizer::pageCacheIdNormalize($currentUri);
        $parts[] = serialize($this->params);

        if (
            JCH_PRO === '1'
            && $this->params->get('pro_cache_platform', '0')
            && $this->utility->isMobile()
        ) {
            $parts[] = '__MOBILE__';
        }

        return md5(serialize($parts));
    }

    /**
     * To be overwritten by the CaptureCache class
     *
     * @return void
     */
    protected function setCaptureCache(string $html)
    {
    }

    public function getAdapterName(): string
    {
        return $this->adapter;
    }

    public function deleteAllItems(): bool
    {
        $return = 1;
        /** @var string[] $iterator */
        $iterator = $this->taggableCache->getIterator();
        foreach ($iterator as $item) {
            $tags = $this->taggableCache->getTags($item);

            if (!empty($tags) && $tags[0] == 'pagecache') {
                $return &= (int)$this->deleteItemById($item);
            }
        }

        $this->cloudflarePurger?->purge();

        return (bool)$return;
    }

    public function isCaptureCacheEnabled(): bool
    {
        return $this->captureCacheEnabled;
    }

    public function disableCaptureCache(): void
    {
        $this->captureCacheEnabled = false;
    }

    public function getStorage(): StorageInterface
    {
        return $this->pageCacheStorage;
    }

    public function hasPageCache(UriInterface $uri): bool
    {
        $id = $this->getPageCacheId($uri);

        return $this->pageCacheStorage->hasItem($id);
    }

    public function hasCaptureCache(UriInterface $uri): bool
    {
        return false;
    }

    public function getUrlFromId(string $id): string
    {
        $tags = $this->taggableCache->getTags($id);

        return $tags['1'];
    }
}
