<?php

class UI_Node {

	public $tagName, $props, $childrens;

	function __construct($tagName = null, $props = null, $childrens = null) {
		$this->tagName = $tagName;
		$this->props = $props;
		$this->childrens = $childrens;
	}

	function __toString() {
		return '<' . $this->tagName . $this->attributesToString() . '>' . $this->childrensToString() . '</' . $this->tagName . '>';
	}

	function toReactNode() { // @return array(3): [ tagName, attributes, childrens ] @see p5UI__buildDom
		return [
			(string)$this->tagName,
			!$this->props ? [] : $this->props,
			$this->childrensToReactNodes(),
		];
	}

	// 'reactNode' => [ 'div', [ 'class' => "container AjaxFrmHorizontalEdit", 'style' => [ "max-width" => "940px" ] ], [
	// 	[ 'h4', [ 'style' => [ "padding-bottom" => "3px", "border-bottom" => "1px solid #ddd" ] ], [
	// 		"Edycja rekordu Nr {$record['ID']}",
	// 		[ 'small', [ 'class' => "pull-right valign-btns-bottom" ], [ $rowFunctionsOut ] ],
	// 	] ],
	// 	[ 'P5UI__FeatureEditForm', [
	// 		'class' => "", 'action' => "", 'method' => "post",
	// 		'id' => "EDIT_FRM_{$this->_htmlID}", // TODO: rm - use React nodes // TODO: $this->_htmlID not exists!
	// 		'ajaxSaveUrl' => "{$syncUrl}&_task=editSaveAjax", // TODO:? &_hash={$this->_htmlID}
	// 		'namespace' => $acl->getNamespace(),
	// 		'idRecord' => $record['ID'],
	// 		'tableLabelHtml' => $tblLabel,
	// 	], [
	// 		[ 'fieldset', [ 'style' => [ "padding-bottom" => "100px" ] ], $jsFields ] // fieldset
	// 	] ] // form
	// ] ] // .container

	function attributesToString() {
		if (!$this->props) return '';
		$attrs = '';
		foreach ($this->props as $k => $v) {
			if (is_array($v)) {
				$attrs .= " {$k}=\"" . implode(" ", $v) . "\"";
			} else if (true === $v) { // eg. open => true : 'open'
				$attrs .= " {$k}";
			} else if (false === $v) { // skip if false value
			} else if (!empty($v)) {
				$attrs .= " {$k}=\"{$v}\"";
			}
		}

		return $attrs;
	}

	function scalarChildToString($child) {
		if (null === $child) return '';
		if (is_scalar($child)) {
			if (is_float($child) && !$child) return '0.0';
			// TODO: is price -> '0.00'
			// if (is_null($child)) return 'NULL'; // ??
			return (string)$child;
		}
	}

	function childrensToReactNodes() {
		if (null === $this->childrens) return '';
		if (is_scalar($this->childrens)) return $this->scalarChildToString($this->childrens);
		if (is_object($this->childrens) && $this->childrens instanceof UI_Node) return [ $this->childrens->toReactNode() ];
		if (!is_array($this->childrens)) throw new Exception("Unsupported children type");

		return array_map(
			function ($child) {
				if (null === $child) return null;
				if (is_scalar($child)) return $this->scalarChildToString($child);
				if (is_object($child)) return $child->toReactNode(); // TODO: is class UI_Node
				return (string)$child; // or throw new Exception('Not implemented UI_Node child type');
			},
			$this->childrens
		);
	}
	function childrensToString() {
		if (null === $this->childrens) return '';
		if (is_scalar($this->childrens)) return $this->scalarChildToString($this->childrens);
		if (is_object($this->childrens) && $this->childrens instanceof UI_Node) return (string)$this->childrens;
		// if (!is_array($this->childrens)) throw new Exception("Unsupported children type");
		if (!is_array($this->childrens)) trigger_error("Unsupported children type: " . var_export($this->childrens, true), E_USER_WARNING);
		if (!is_array($this->childrens)) return '';
		return array_reduce(
			$this->childrens,
			function ($ret, $child) {
				return "{$ret}{$child}"; // $child->__toString()
			},
			""
		);
	}

}