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<?php
/**
 * @author Jegtheme
 */

namespace JNews;

/**
 * Class Tree Node
 */
Class ContentTag {
	/**
	 * @var TreeNode
	 */
	private $pointer;
	private $root;
	private static $content;

	public function __construct( $content ) {
		self::$content = $content;
		$this->populate_tag();
	}

	public function find( $tag, $number, $end=true ) {
		if ( is_array( $this->pointer->child ) ) {
			foreach ( $this->pointer->child as $child ) {
				if ( $child->tag === $tag ) {
					$number --;
				}

				if ( $number === 0 ) {
					return $child->end;
				}
			}
			if ( $end ) {
				return end( $this->pointer->child )->end;
			}
			return 0;
		}
	}

	public function total( $tag ) {
		$number = 0;

		if ( is_array( $this->pointer->child ) ) {
			foreach ( $this->pointer->child as $child ) {
				if ( $child->tag === $tag ) {
					$number ++;
				}
			}
		}

		return $number;
	}

	protected function populate_tag() {
		$this->pointer = new TreeNode();
		$this->root    = $this->pointer;

		preg_match_all( '/<[^>]*>/im', self::$content, $matches, PREG_OFFSET_CAPTURE );

		foreach ( $matches[0] as $key => $match ) {
			$tag = $this->get_tag( $match[0] );
			if ( ! empty( $tag ) ) {
				if ( ! $this->is_closed_tag( $match[0] ) ) {
					$this->register_tag( $tag, $match[1] );
				} else {
					$this->reset_tag( $match[1] );
				}
			}
		}
	}

	public static function get_content() {
		return self::$content;
	}

	protected function is_closed_tag( $tag ) {
		return substr( $tag, 0, 2 ) === '</';
	}

	protected function get_tag( $html ) {
		$html = preg_replace("/<!--.*?-->/ms","",$html);
		if ( ! empty( $html ) ) {
			preg_match( '/<\/?([^\s^>]+)/', $html, $tag );

			return $tag[1];
		}
		return '';
	}

	protected function register_tag( $tag, $start ) {
		$this->pointer = $this->pointer === null ? $this->root : $this->pointer;
		$this->pointer = $this->pointer->create_child( $tag, $start );
	}

	protected function reset_tag( $end ) {
		$this->pointer = $this->pointer === null ? $this->root : $this->pointer;
		$this->pointer = $this->pointer->end_child( $end );
	}
}