<?php

/**
 * Joomla! Content Management System
 *
 * @copyright  (C) 2014 Open Source Matters, Inc. <https://www.joomla.org>
 * @license    GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\CMS\Application\CLI\Output\Processor;

use Joomla\CMS\Application\CLI\ColorStyle;

/**
 * Command line output processor supporting ANSI-colored output
 *
 * @since       4.0.0
 * @deprecated  5.0  Use the `joomla/console` package instead
 */
class ColorProcessor implements ProcessorInterface
{
    /**
     * Flag to remove color codes from the output
     *
     * @var    boolean
     * @since  4.0.0
     */
    public $noColors = false;

    /**
     * Regex to match tags
     *
     * @var    string
     * @since  4.0.0
     */
    protected $tagFilter = '/<([a-z=;]+)>(.*?)<\/\\1>/s';

    /**
     * Regex used for removing color codes
     *
     * @var    string
     * @since  4.0.0
     */
    protected static $stripFilter = '/<[\/]?[a-z=;]+>/';

    /**
     * Array of ColorStyle objects
     *
     * @var    ColorStyle[]
     * @since  4.0.0
     */
    protected $styles = [];

    /**
     * Class constructor
     *
     * @param   boolean  $noColors  Defines non-colored mode on construct
     *
     * @since   4.0.0
     */
    public function __construct($noColors = null)
    {
        if ($noColors === null) {
            /*
             * By default windows cmd.exe and PowerShell does not support ANSI-colored output
             * if the variable is not set explicitly colors should be disabled on Windows
             */
            $noColors = (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN');
        }

        $this->noColors = $noColors;

        $this->addPredefinedStyles();
    }

    /**
     * Add a style.
     *
     * @param   string      $name   The style name.
     * @param   ColorStyle  $style  The color style.
     *
     * @return  $this
     *
     * @since   4.0.0
     */
    public function addStyle($name, ColorStyle $style)
    {
        $this->styles[$name] = $style;

        return $this;
    }

    /**
     * Strip color tags from a string.
     *
     * @param   string  $string  The string.
     *
     * @return  string
     *
     * @since   4.0.0
     */
    public static function stripColors($string)
    {
        return preg_replace(static::$stripFilter, '', $string);
    }

    /**
     * Process a string.
     *
     * @param   string  $string  The string to process.
     *
     * @return  string
     *
     * @since   4.0.0
     */
    public function process($string)
    {
        preg_match_all($this->tagFilter, $string, $matches);

        if (!$matches) {
            return $string;
        }

        foreach ($matches[0] as $i => $m) {
            if (\array_key_exists($matches[1][$i], $this->styles)) {
                $string = $this->replaceColors($string, $matches[1][$i], $matches[2][$i], $this->styles[$matches[1][$i]]);
            } elseif (strpos($matches[1][$i], '=')) {
                // Custom format
                $string = $this->replaceColors($string, $matches[1][$i], $matches[2][$i], ColorStyle::fromString($matches[1][$i]));
            }
        }

        return $string;
    }

    /**
     * Replace color tags in a string.
     *
     * @param   string      $text   The original text.
     * @param   string      $tag    The matched tag.
     * @param   string      $match  The match.
     * @param   ColorStyle  $style  The color style to apply.
     *
     * @return  mixed
     *
     * @since   4.0.0
     */
    private function replaceColors($text, $tag, $match, ColorStyle $style)
    {
        $replace = $this->noColors
            ? $match
            : "\033[" . $style . 'm' . $match . "\033[0m";

        return str_replace('<' . $tag . '>' . $match . '</' . $tag . '>', $replace, $text);
    }

    /**
     * Adds predefined color styles to the ColorProcessor object
     *
     * @return  $this
     *
     * @since   4.0.0
     */
    private function addPredefinedStyles()
    {
        $this->addStyle(
            'info',
            new ColorStyle('green', '', ['bold'])
        );

        $this->addStyle(
            'comment',
            new ColorStyle('yellow', '', ['bold'])
        );

        $this->addStyle(
            'question',
            new ColorStyle('black', 'cyan')
        );

        $this->addStyle(
            'error',
            new ColorStyle('white', 'red')
        );

        return $this;
    }
}
