<?php namespace Todaymade\Daux\Format\HTML;

use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Todaymade\Daux\Config;
use Todaymade\Daux\Console\RunAction;
use Todaymade\Daux\Daux;
use Todaymade\Daux\DauxHelper;
use Todaymade\Daux\Format\Base\LiveGenerator;
use Todaymade\Daux\Format\HTML\ContentTypes\Markdown\ContentType;
use Todaymade\Daux\GeneratorHelper;
use Todaymade\Daux\Tree\ComputedRaw;
use Todaymade\Daux\Tree\Directory;
use Todaymade\Daux\Tree\Entry;
use Todaymade\Daux\Tree\Raw;

class Generator implements \Todaymade\Daux\Format\Base\Generator, LiveGenerator
{
    use RunAction, HTMLUtils;

    /** @var Daux */
    protected $daux;

    protected $indexed_pages = [];

    /**
     * @param Daux $daux
     */
    public function __construct(Daux $daux)
    {
        $params = $daux->getParams();

        $this->daux = $daux;
        $this->templateRenderer = new Template($params);
        $params->templateRenderer = $this->templateRenderer;
    }

    /**
     * @return array
     */
    public function getContentTypes()
    {
        return [
            'markdown' => new ContentType($this->daux->getParams()),
        ];
    }

    public function generateAll(InputInterface $input, OutputInterface $output, $width)
    {
        $destination = $input->getOption('destination');

        $params = $this->daux->getParams();
        if (is_null($destination)) {
            $destination = $this->daux->local_base . DIRECTORY_SEPARATOR . 'static';
        }

        $this->runAction(
            'Copying Static assets ...',
            $width,
            function() use ($destination, $params) {
                $this->ensureEmptyDestination($destination);

                $this->copyThemes($destination, $params->getThemesPath());
            }
        );

        $output->writeLn('Generating ...');

        if (!array_key_exists('search', $params['html']) || !$params['html']['search']) {
            $params['html']['search'] = $input->getOption('search');
        }

        $this->generateRecursive($this->daux->tree, $destination, $params, $output, $width, $params['html']['search']);

        if ($params['html']['search']) {
            GeneratorHelper::copyRecursive(
                $this->daux->local_base . DIRECTORY_SEPARATOR . 'tipuesearch' . DIRECTORY_SEPARATOR,
                $destination . DIRECTORY_SEPARATOR . 'tipuesearch'
            );
            file_put_contents(
                $destination . DIRECTORY_SEPARATOR . 'tipuesearch' . DIRECTORY_SEPARATOR . 'tipuesearch_content.json',
                json_encode(['pages' => $this->indexed_pages])
            );

            if (json_last_error()) {
                echo "Could not write search index: \n" . json_last_error_msg() . "\n";
            }
        }
    }

    /**
     * Remove HTML tags, including invisible text such as style and
     * script code, and embedded objects.  Add line breaks around
     * block-level tags to prevent word joining after tag removal.
     * Also collapse whitespace to single space and trim result.
     * modified from: http://nadeausoftware.com/articles/2007/09/php_tip_how_strip_html_tags_web_page
     *
     * @param string $text
     * @return string
     */
    private function sanitize($text)
    {
        $text = preg_replace(
            [
                // Remove invisible content
                '@<head[^>]*?>.*?</head>@siu',
                '@<style[^>]*?>.*?</style>@siu',
                '@<script[^>]*?.*?</script>@siu',
                '@<object[^>]*?.*?</object>@siu',
                '@<embed[^>]*?.*?</embed>@siu',
                '@<applet[^>]*?.*?</applet>@siu',
                '@<noframes[^>]*?.*?</noframes>@siu',
                '@<noscript[^>]*?.*?</noscript>@siu',
                '@<noembed[^>]*?.*?</noembed>@siu',
                // Add line breaks before and after blocks
                '@</?((address)|(blockquote)|(center)|(del))@iu',
                '@</?((div)|(h[1-9])|(ins)|(isindex)|(p)|(pre))@iu',
                '@</?((dir)|(dl)|(dt)|(dd)|(li)|(menu)|(ol)|(ul))@iu',
                '@</?((table)|(th)|(td)|(caption))@iu',
                '@</?((form)|(button)|(fieldset)|(legend)|(input))@iu',
                '@</?((label)|(select)|(optgroup)|(option)|(textarea))@iu',
                '@</?((frameset)|(frame)|(iframe))@iu',
            ],
            [
                ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
                "\n\$0", "\n\$0", "\n\$0", "\n\$0", "\n\$0", "\n\$0",
                "\n\$0", "\n\$0",
            ],
            $text
        );

        $text = trim(preg_replace('/\s+/', ' ', strip_tags($text)));

        // Sometimes strings are detected as invalid UTF-8 and json_encode can't treat them
        // iconv can fix those strings
        $text = iconv('UTF-8', 'UTF-8//IGNORE', $text);

        return $text;
    }

    /**
     * Recursively generate the documentation
     *
     * @param Directory $tree
     * @param string $output_dir
     * @param \Todaymade\Daux\Config $params
     * @param OutputInterface $output
     * @param int $width
     * @param bool $index_pages
     * @param string $base_url
     * @throws \Exception
     */
    private function generateRecursive(Directory $tree, $output_dir, $params, $output, $width, $index_pages, $base_url = '')
    {
        DauxHelper::rebaseConfiguration($params, $base_url);

        if ($base_url !== '' && empty($params['entry_page'])) {
            $params['entry_page'] = $tree->getFirstPage();
        }

        foreach ($tree->getEntries() as $key => $node) {
            if ($node instanceof Directory) {
                $new_output_dir = $output_dir . DIRECTORY_SEPARATOR . $key;
                mkdir($new_output_dir);
                $this->generateRecursive($node, $new_output_dir, $params, $output, $width, $index_pages, '../' . $base_url);

                // Rebase configuration again as $params is a shared object
                DauxHelper::rebaseConfiguration($params, $base_url);
            } else {
                $this->runAction(
                    '- ' . $node->getUrl(),
                    $width,
                    function() use ($node, $output_dir, $key, $params, $index_pages) {
                        if ($node instanceof Raw) {
                            copy($node->getPath(), $output_dir . DIRECTORY_SEPARATOR . $key);

                            return;
                        }

                        $this->daux->tree->setActiveNode($node);

                        $generated = $this->generateOne($node, $params);
                        file_put_contents($output_dir . DIRECTORY_SEPARATOR . $key, $generated->getContent());
                        if ($index_pages) {
                            $this->indexed_pages[] = [
                                'title' => $node->getTitle(),
                                'text' => $this->sanitize($generated->getPureContent()),
                                'tags' =>  '',
                                'url' => $node->getUrl(),
                            ];
                        }
                    }
                );
            }
        }
    }

    /**
     * @param Entry $node
     * @param Config $params
     * @return \Todaymade\Daux\Format\Base\Page
     */
    public function generateOne(Entry $node, Config $params)
    {
        if ($node instanceof Raw) {
            return new RawPage($node->getPath());
        }

        if ($node instanceof ComputedRaw) {
            return new ComputedRawPage($node);
        }

        $params['request'] = $node->getUrl();

        $contentPage = ContentPage::fromFile($node, $params, $this->daux->getContentTypeHandler()->getType($node));
        $contentPage->templateRenderer = $this->templateRenderer;

        return $contentPage;
    }
}
