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<?php

namespace Anax\Content;

/**
 * Pages based on file content.
 */
class CFileBasedContent
{
    use \Anax\TConfigure,
        \Anax\DI\TInjectionAware;



    /**
     * Properties.
     */
    private $index = null;
    private $ignoreCache = false;



    /**
     * Should the cache be used or ignored.
     *
     * @param boolean $use true to use the cache or false to ignore the cache.
     *
     * @return this.
     */
    public function useCache($use)
    {
        $this->ignoreCache = !$use;

        return $this;
    }



    /**
     * Get the index as an array.
     *
     * @return array as index.
     */
    public function getIndex()
    {
        return $this->loadIndex();
    }



    /**
     * Create the index of all content into an array.
     *
     * @return array as index.
     */
    private function loadIndex()
    {
        if ($this->index) {
            return $this->index;
        }

        $key = $this->di->cache->createKey(__CLASS__, "index");
        $this->index = $this->di->cache->get($key);

        if (!$this->index || $this->ignoreCache) {
            $this->index = $this->createIndex();
            $this->di->cache->put($key, $this->index);
        }

        return $this->index;
    }



    /**
     * Generate an index from the directory structure.
     *
     * @return array as table of content.
     */
    private function createIndex()
    {
        $basepath   = $this->config["basepath"];
        $pattern    = $this->config["pattern"];
        $path       = "$basepath/$pattern";
        
        $index = [];
        foreach (glob_recursive($path) as $file) {
            $filepath = substr($file, strlen($basepath) + 1);

            $matches = [];
            preg_match("#^(\d*)_*([^\.]+)\.md$#", basename($filepath), $matches);
            $dirpart = dirname($filepath) . "/";
            if ($dirpart === "./") {
                $dirpart = null;
            }
            $key = $dirpart . $matches[2];

            $index[$key] = [
                "file"    => $filepath,
                "section" => $matches[1]
            ];
        }

        return $index;
    }



    /**
     * Map the route to the correct entry in the index.
     *
     * @param string $route current route used to access page.
     *
     * @return string as the title for the content.
     */
    private function mapRoute2Index($route)
    {
        if (key_exists($route, $this->index)) {
            return $this->index[$route];
        } elseif (empty($route) && key_exists("index", $this->index)) {
            return $this->index["index"];
        } elseif (key_exists($route . "/index", $this->index)) {
            return $this->index["$route/index"];
        }

        throw new \Anax\Exception\NotFoundException(t("The content does not exists in the index."));
    }



    /**
     * Map url to content if such mapping can be done.
     *
     * @throws NotFoundException when mapping can not be done.
     */
    public function contentForRoute()
    {
        // Settings from config
        $basepath = $this->config["basepath"];
        $filter   = $this->config["textfilter"];

        // Get the route
        $route = $this->di->request->getRoute();

        // Load index and map route to entry
        $this->loadIndex();
        $content = $this->mapRoute2Index($route);

        // Whole path to file
        $path = $basepath . "/" . $content["file"];
        $content["path"] = $path;

        // Load content from file
        if (!is_file($path)) {
            throw new \Anax\Exception\NotFoundException(t("The content does not exists as a file."));
        }
        $src = file_get_contents($path);
        $content["src"] = $src;

        // Get filtered content
        $filtered = $this->di->textFilter->parse($src, $filter);
        //$frontmatter = $this->di->textFilter->yamlFrontMatter($src);

        $content["frontmatter"] = $filtered->frontmatter;
        $content["text"]        = $filtered->text;

        return (object) $content;
    }
}