<?php

namespace Knp\Snappy;

/**
 * Use this class to transform a html/a url to a pdf.
 *
 * @author  Matthieu Bontemps <matthieu.bontemps@knplabs.com>
 * @author  Antoine Hérault <antoine.herault@knplabs.com>
 */
class Pdf extends AbstractGenerator
{
    /**
     * @var array
     */
    protected $optionsWithContentCheck = [];

    /**
     * {@inheritdoc}
     */
    public function __construct($binary = null, array $options = [], array $env = null)
    {
        $this->setDefaultExtension('pdf');
        $this->setOptionsWithContentCheck();

        parent::__construct($binary, $options, $env);
    }

    /**
     * {@inheritdoc}
     */
    public function generate($input, $output, array $options = [], $overwrite = false)
    {
        $options = $this->handleOptions($this->mergeOptions($options));

        parent::generate($input, $output, $options, $overwrite);
    }

    /**
     * Handle options to transform HTML strings into temporary files containing HTML.
     *
     * @param array $options
     *
     * @return array $options Transformed options
     */
    protected function handleOptions(array $options = [])
    {
        foreach ($options as $option => $value) {
            if (null === $value) {
                unset($options[$option]);

                continue;
            }

            if (!empty($value) && \array_key_exists($option, $this->optionsWithContentCheck)) {
                $saveToTempFile = !$this->isFile($value) && !$this->isOptionUrl($value);
                $fetchUrlContent = $option === 'xsl-style-sheet' && $this->isOptionUrl($value);

                if ($saveToTempFile || $fetchUrlContent) {
                    $fileContent = $fetchUrlContent ? \file_get_contents($value) : $value;
                    $options[$option] = $this->createTemporaryFile($fileContent, $this->optionsWithContentCheck[$option]);
                }
            }
        }

        return $options;
    }

    /**
     * Convert option content or url to file if it is needed.
     *
     * @param mixed $option
     *
     * @return bool
     */
    protected function isOptionUrl($option)
    {
        return (bool) \filter_var($option, \FILTER_VALIDATE_URL);
    }

    /**
     * {@inheritdoc}
     */
    protected function configure()
    {
        $this->addOptions([
            // Global options
            'collate' => null,
            'no-collate' => null,
            'cookie-jar' => null,
            'copies' => null,
            'dpi' => null,
            'extended-help' => null,
            'grayscale' => null,
            'help' => null,
            'htmldoc' => null,
            'ignore-load-errors' => null, // old v0.9
            'image-dpi' => null,
            'image-quality' => null,
            'license' => null,
            'log-level' => null,
            'lowquality' => true,
            'manpage' => null,
            'margin-bottom' => null,
            'margin-left' => null,
            'margin-right' => null,
            'margin-top' => null,
            'orientation' => null,
            'page-height' => null,
            'page-size' => null,
            'page-width' => null,
            'no-pdf-compression' => null,
            'quiet' => null,
            'read-args-from-stdin' => null,
            'readme' => null,
            'title' => null,
            'use-xserver' => null,
            'version' => null,
            // Outline options
            'dump-default-toc-xsl' => null,
            'dump-outline' => null,
            'outline' => null,
            'no-outline' => null,
            'outline-depth' => null,
            'output-format' => null,
            // Page options
            'allow' => null,
            'background' => null,
            'no-background' => null,
            'bypass-proxy-for' => null,
            'cache-dir' => null,
            'checkbox-checked-svg' => null,
            'checkbox-svg' => null,
            'cookie' => null,
            'custom-header' => null,
            'custom-header-propagation' => null,
            'no-custom-header-propagation' => null,
            'debug-javascript' => null,
            'no-debug-javascript' => null,
            'default-header' => null,
            'encoding' => null,
            'disable-external-links' => null,
            'enable-external-links' => null,
            'disable-forms' => null,
            'enable-forms' => null,
            'images' => null,
            'no-images' => null,
            'disable-internal-links' => null,
            'enable-internal-links' => null,
            'disable-javascript' => null,
            'enable-javascript' => null,
            'javascript-delay' => null,
            'keep-relative-links' => null,
            'load-error-handling' => null,
            'load-media-error-handling' => null,
            'disable-local-file-access' => null,
            'enable-local-file-access' => null,
            'minimum-font-size' => null,
            'exclude-from-outline' => null,
            'include-in-outline' => null,
            'page-offset' => null,
            'password' => null,
            'disable-plugins' => null,
            'enable-plugins' => null,
            'post' => null,
            'post-file' => null,
            'print-media-type' => null,
            'no-print-media-type' => null,
            'proxy' => null,
            'proxy-hostname-lookup' => null,
            'radiobutton-checked-svg' => null,
            'radiobutton-svg' => null,
            'redirect-delay' => null, // old v0.9
            'resolve-relative-links' => null,
            'run-script' => null,
            'disable-smart-shrinking' => null,
            'enable-smart-shrinking' => null,
            'ssl-crt-path' => null,
            'ssl-key-password' => null,
            'ssl-key-path' => null,
            'stop-slow-scripts' => null,
            'no-stop-slow-scripts' => null,
            'disable-toc-back-links' => null,
            'enable-toc-back-links' => null,
            'user-style-sheet' => null,
            'username' => null,
            'viewport-size' => null,
            'window-status' => null,
            'zoom' => null,
            // Headers and footer options
            'footer-center' => null,
            'footer-font-name' => null,
            'footer-font-size' => null,
            'footer-html' => null,
            'footer-left' => null,
            'footer-line' => null,
            'no-footer-line' => null,
            'footer-right' => null,
            'footer-spacing' => null,
            'header-center' => null,
            'header-font-name' => null,
            'header-font-size' => null,
            'header-html' => null,
            'header-left' => null,
            'header-line' => null,
            'no-header-line' => null,
            'header-right' => null,
            'header-spacing' => null,
            'replace' => null,
            // Cover object
            'cover' => null,
            // TOC object
            'toc' => null,
            // TOC options
            'disable-dotted-lines' => null,
            'toc-depth' => null, // old v0.9
            'toc-font-name' => null, // old v0.9
            'toc-l1-font-size' => null, // old v0.9
            'toc-header-text' => null,
            'toc-header-font-name' => null, // old v0.9
            'toc-header-font-size' => null, // old v0.9
            'toc-level-indentation' => null,
            'disable-toc-links' => null,
            'toc-text-size-shrink' => null,
            'xsl-style-sheet' => null,
        ]);
    }

    /**
     * Array with options which require to store the content of the option before passing it to wkhtmltopdf.
     *
     * @return $this
     */
    protected function setOptionsWithContentCheck()
    {
        $this->optionsWithContentCheck = [
            'header-html' => 'html',
            'footer-html' => 'html',
            'cover' => 'html',
            'xsl-style-sheet' => 'xsl',
        ];

        return $this;
    }
}