<?php

namespace Qs;

use Qs_Array;
use Qs_View;

class Html
{
    public static function renderUl(array $list)
    {
        if (empty($list)) {
            return '';
        }
        $html = '<ul>';
        foreach ($list as $title) {
            $html .= '<li>' . htmlspecialchars($title) . '</li>' . PHP_EOL;
        }
        $html .= '</ul>' . PHP_EOL;
        return $html;
    }

    public static function renderLink($url, $text = null, array $attribs = [])
    {
        if (empty($text)) {
            $text = $url;
        }
        $attribs['href'] = $url;
        return self::renderContainer('a', $text, $attribs);
    }

    public static function renderAttribs(array $attribs)
    {
        $xhtml = '';
        $enc   = Qs_View::getInstance()->getEncoding();
        foreach ((array) $attribs as $key => $val) {
            $key = htmlspecialchars($key, ENT_COMPAT, $enc);
            if (empty($val)) {
                $xhtml .= ' ' . $key;
                continue;
            }
            if (is_array($val)) {
                if (array_key_exists('callback', $val)
                    && is_callable($val['callback'])
                ) {
                    $val = call_user_func($val['callback']);
                } else {
                    $val = implode(' ', $val);
                }
            }
            $val    = htmlspecialchars($val, ENT_COMPAT, $enc);
            $xhtml .= " $key=\"$val\"";
        }
        return $xhtml;
    }

    /**
     * @param $tags
     *
     * @param $content
     * @param array $attribs
     * @return string
     */
    public static function renderContainer($tags, $content, array $attribs = array())
    {
        if (is_string($tags)) {
            $tags = [['tag' => $tags]];
        }
        if (is_array($tags)) {
            $tags = array_map(function ($value) {
                if (is_array($value)) {
                    return $value;
                }
                return ['tag' => $value];
            }, $tags);
        }
        $tags = array_reverse($tags);
        $firstKey = key($tags);
        if ($attribs && !array_key_exists('attribs', $tags[$firstKey])) {
            $tags[$firstKey]['attribs'] = $attribs;
        }

        $xhtml = $content;
        reset($tags);
        foreach ($tags as $tag) {
            $xhtml = '<' . $tag['tag'] . self::renderAttribs(Qs_Array::get($tag, 'attribs', [])) . '>'
                    . $xhtml
                    . '</' . $tag['tag'] . '>' . PHP_EOL;
        }
        return $xhtml;
    }

    public static function renderTag($tag, array $attribs = array())
    {
        return '<' . $tag . self::renderAttribs($attribs) . '/>' . PHP_EOL;
    }

    public static function renderStylesheetLink($href, $media = 'all')
    {
        $type = 'text/css';
        $rel = 'stylesheet';
        return self::renderTag('link', compact('href', 'media', 'type', 'rel'));
    }

    public static function toggleClass($class, $name, $display)
    {
        if ($display) {
            return self::addClass($class, $name);
        }
        return self::removeClass($class, $name);
    }

    public static function removeClass($class, $name)
    {
        $parts = explode(' ', $class);
        $parts = array_filter($parts, 'trim');
        return implode(' ', Qs_Array::excludeValue($parts, $name));
    }

    public static function addClass($class, $name)
    {
        $parts = explode(' ', $class);
        $parts = array_filter($parts, 'trim');
        if (!in_array($name, $parts)) {
            $parts[] = $name;
        }
        return implode(' ', $parts);
    }

    public static function renderDom(array $dom, $content = '')
    {
        foreach ($dom as $element) {
            $tag = array_shift($element);
            $attribs = array_shift($element);
            $content = self::renderContainer($tag, $content, $attribs);
        }
        return $content;
    }
}