<?php

namespace classes\tools\html;

class element {

    private $tag;
    private $html;
    private $attributes;
    private $selfClosing;
    private $selfClosingTags = array(
        'area',
        'base',
        'br',
        'col',
        'embed',
        'hr',
        'img',
        'input',
        'keygen',
        'link',
        'menuitem',
        'meta',
        'param',
        'source',
        'track',
        'wbr');

    public function __construct($tag=null, $attributes = array(), $html = '', $selfClosing = null) {

        if (!isset($tag))
            throw new \Exception('Tag is a required argument');

        $this->tag = trim(strtolower($tag));
        $this->html = $html;

        if (isset($attributes['class']))
            $attributes['class'] = preg_replace("~\s{2,}~", ' ', $attributes['class']);

        $this->attributes = $attributes;
        $this->selfClosing = $selfClosing;

        $this->selfClosing = isset($this->selfClosing) ? $this->selfClosing : in_array($this->tag, $this->selfClosingTags);
    }

    public function id($id = null) {
        if (isset($id)) {
            $this->attributes['id'] = $id;
            return $this;
        }

        return isset($this->attributes['id']) ? $this->attributes['id'] : null;
    }

    public function html($html = null) {

        if (isset($html)) {
            $this->html = $html;
            return $this;
        }

        return isset($this->html) ? $this->html : null;
    }

    public function val($val = null) {
        if (isset($val)) {
            $this->attributes['value'] = $val;
            return $this;
        }

        return isset($this->attributes['value']) ? $this->attributes['value'] : null;
    }

    public function name($name = null) {
        if (isset($name)) {
            $this->attributes['name'] = $name;
            return $this;
        }

        return isset($this->attributes['name']) ? $this->attributes['name'] : null;
    }

    public function attr($attr = null, $val = null) {

        if (!isset($attr))
            return $this;

        if (isset($val)) {
            $this->attributes[$attr] = $val;
            return $this;
        }

        return isset($this->attributes[$attr]) ? $this->attributes[$attr] : null;
    }

    public function removeAttr($attr = null) {

        if (!isset($attr))
            return $this;

        unset($this->attributes[$attr]);
        return $this;
    }

    public function prop($prop = null, $val = null) {
        if (!isset($prop) || (!isset($val) && !is_bool($val)))
            return $this;

        if ($val)
            $this->attributes[$prop]=$prop;
        else
            unset ($this->attributes[$prop]);

        return $this;
    }

    public function addClass($class = '') {

        $class = trim($class);

        if (isset($this->attributes['class'])) {
            $classList = explode(' ', $this->attributes['class']);
            if (!in_array($class, $classList))
                $this->attributes['class'].=" $class";
        } else
            $this->attributes['class'] = "$class";

        return $this;
    }

    public function removeClass($class = '') {

        $pattern = "~(^$class$|^$class\s|\s$class\s|\s$class$)~";
        $this->attributes['class'] = trim(preg_replace($pattern, ' ', $this->attributes['class']));

        if (empty($this->attributes['class']))
            $this->removeAttr('class');

        return $this;
    }

    public function append($html = '') {
        $this->html.=$html;
        return $this;
    }

    public function prepend($html = '') {
        $this->html = $html . $this->html;
        return $this;
    }

    public function appendTo($element = null) {

        if (!isset($element))
            return $this;

        $element->append($this);
        return $this;
    }

    public function prependTo($element = null) {

        if (!isset($element))
            return $this;

        $element->prepend($this);
        return $this;
    }

    public function __toString() {

        $element = "<$this->tag";
        foreach ($this->attributes as $attribute => $value) {
            $element.= " $attribute=\"$value\"";
        }
        if ($this->selfClosing) {
            $element.="/>";
            return $element;
        }

        $element.=">$this->html</$this->tag>";

        return $element;
    }

}