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<?php
/**
 * Content Inserter class.
 *
 * @since 2.0.0
 *
 * @package OMAPI
 * @author  Justin Sternberg
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Content Inserter class.
 *
 * @since 2.0.0
 */
class OMAPI_Inserter {

	/**
	 * Content to insert.
	 *
	 * @since 2.0.0
	 *
	 * @var string
	 */
	protected $to_insert = '';

	/**
	 * Original content.
	 *
	 * @since 2.0.0
	 *
	 * @var string
	 */
	protected $content = '';

	/**
	 * Any tags which we should not insert content in.
	 * The order is important ("a" tag should be after any other tags starting with "a") in order
	 * to avoid false positives (where "a" tag is "found", but it's really an "abbr" tag).
	 *
	 * @since 2.0.0
	 *
	 * @var string
	 */
	const INSERT_AFTER_TAGS = 'address,abbr,acronym,area,audio,a,bdo,big,blockquote,button,b,caption,cite,code,col,colgroup,del,dfn,dl,dt,em,figure,figcaption,font,h1,h2,h3,h4,h5,h6,hgroup,ins,i,kbd,label,legend,map,mark,menu,pre,samp,small,strike,strong,sub,sup,s,table,tbody,textarea,tfoot,thead,title,track,tt,tr,ul,u,ol,var,video';

	/**
	 * Constructor.
	 *
	 * @since 2.0.0
	 *
	 * @param string $content   The original content.
	 * @param string $to_insert The content to insert into the original content.
	 */
	public function __construct( $content, $to_insert ) {
		$this->content   = $content;
		$this->to_insert = $to_insert;
	}

	/**
	 * Prepend the original content with the content to insert.
	 *
	 * @since  2.0.0
	 *
	 * @return string The combined content.
	 */
	public function prepend() {
		return $this->to_insert . $this->content;
	}

	/**
	 * Append the original content with the content to insert.
	 *
	 * @since  2.0.0
	 *
	 * @return string The combined content.
	 */
	public function append() {
		return $this->content . $this->to_insert;
	}

	/**
	 * Inserts the insert-content after X paragraphs in the original content.
	 *
	 * @since  2.0.0
	 *
	 * @param  int $paragraph_number The paragraph number to insert after.
	 *
	 * @return string The combined content.
	 */
	public function after_paragraph( $paragraph_number ) {

		// If "0", then prepend.
		if ( empty( $paragraph_number ) ) {
			return $this->prepend();
		}

		$closing_p  = '</p>';
		$paragraphs = explode( $closing_p, $this->content );
		$count      = count( $paragraphs );

		// If the number of paragraphs in the content is less than
		// the number we asked for, just append it to the end.
		if ( $count < $paragraph_number ) {
			return $this->append();
		}

		$valid_paragraphs = 0;
		$invalid_tag      = '';
		$appended         = false;

		foreach ( $paragraphs as $index => $paragraph ) {

			// Only add closing tag to non-empty paragraphs.
			if ( trim( $paragraph ) ) {

				// Adding closing markup now, rather than at implode, means insertion
				// is outside of the paragraph markup, and not just inside of it.
				$paragraphs[ $index ] .= $closing_p;
			}

			// If it has already appended, it doesn't need to keep checking.
			// It needs to keep the loop to close the paragraph tag.
			if ( $appended ) {
				continue;
			}

			// If it has an invalid tag from the last index,
			// search if this index has the closing tag.
			// If it doesn't have, it need to continue to the next index.
			if ( ! empty( $invalid_tag ) && self::find_tag( $invalid_tag, $paragraphs[ $index ] ) ) {
				// Found it, let's clean it.
				$invalid_tag = '';
			}

			// Check if it has any after_tags inside this block.
			$invalid_tag = self::find_invalid_word_tag( $paragraphs[ $index ] );
			if ( ! empty( $invalid_tag ) ) {
				// If so, then it must continue counting to the next paragraph.
				continue;
			}

			// This is a valid paragraph.
			$valid_paragraphs++;

			// If it has enough valid paragraphs, it can continue
			if ( $valid_paragraphs === $paragraph_number ) {

				// If it doesn't have an invalid tag inside this paragraph,
				// it can append after this paragraph.
				$paragraphs[ $index ] .= $this->to_insert;
				$appended              = true;
			}
		}

		// If it appended, it can output all paragraphs.
		if ( $appended ) {
			return implode( '', $paragraphs );
		}

		// If it didn't append, then it didn't have enough valid paragraphs,
		// so we'll append it to the end.
		return $this->append();
	}

	/**
	 * Inserts the insert-content after X words in the original content.
	 *
	 * @since  2.0.0
	 *
	 * @param  int $word_number The word number to insert after.
	 *
	 * @return string The combined content.
	 */
	public function after_words( $word_number ) {

		// If "0", then prepend.
		if ( empty( $word_number ) ) {
			return $this->prepend();
		}

		// The following splitting into words code is copied from the wp_trim_words function.

		$rawtext = wp_strip_all_tags( $this->content );

		/*
		 * translators: If your word count is based on single characters (e.g. East Asian characters),
		 * enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
		 * Do not translate into your own language.
		 */
		if ( strpos( _x( 'words', 'Word count type. Do not translate!', 'optin-monster-api' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
			$rawtext = trim( preg_replace( "/[\n\r\t ]+/", ' ', $rawtext ), ' ' );
			preg_match_all( '/./u', $rawtext, $words_array );
			$words_array = array_slice( $words_array[0], 0, $word_number + 1 );
		} else {
			$words_array = preg_split( "/[\n\r\t ]+/", $rawtext, $word_number + 1, PREG_SPLIT_NO_EMPTY );
		}

		// If the number of words in the content is less than
		// the number we asked for, just append it to the end.
		if ( count( $words_array ) <= $word_number ) {
			return $this->append();
		}

		// Now we need to clean up the words, removing punctuation,
		// so our chances of matching are greater.
		foreach ( $words_array as $index => $word ) {
			$words_array[ $index ] = preg_replace( '~[^\w\s]~', '', $word );
		}

		$after_word         = $words_array[ $word_number - 1 ];
		$number_occurrences = 0;

		$rest = array_pop( $words_array );

		foreach ( $words_array as $word ) {
			if ( ! empty( $after_word ) && false !== strpos( $word, $after_word ) ) {
				$number_occurrences++;
			}
		}

		$to_replace = $this->content;

		// We need to loop through the number of occurrences...
		while ( $number_occurrences-- ) {

			// Then find the word in the content to replace...
			$pos = strpos( $to_replace, $after_word ) + strlen( $after_word );

			// And split that content where the word was found...
			$to_replace = substr( $to_replace, $pos );

			// And keep doing that until we've reached our final occurrence.
		}

		// Ok, no we know where we want to insert, but we can't insert inside any
		// of our self::INSERT_AFTER_TAGS tags, so we need to insert _after_ them.
		$to_replace = self::after_tags( $to_replace );

		// Now insert into the content.
		$updated_content = str_replace( $to_replace, $this->to_insert . $to_replace, $this->content );

		return $updated_content;
	}

	/**
	 * Takes given content and returns first acceptable content outside of any
	 * self::INSERT_AFTER_TAGS tags.
	 *
	 * @since  2.0.0
	 *
	 * @param  string $content Content to replace/find.
	 *
	 * @return string           Updated content.
	 */
	protected static function after_tags( $content ) {
		foreach ( explode( ',', self::INSERT_AFTER_TAGS ) as $tag ) {
			$positions = self::find_tag( $tag, $content );
			if ( ! $positions ) {
				continue;
			}

			// Ok... we found a tag that we should scoot behind.
			return substr( $content, $positions['closing'] + strlen( $positions['closing_tag'] ) );
		}

		return $content;
	}

	/**
	 * Get the opening/closing positions of given tag.
	 *
	 * @since 2.10.0
	 *
	 * @param  string $tag     The html tag.
	 * @param  string $content The html content to search.
	 *
	 * @return array            Array of tag position data.
	 */
	public static function get_tag_positions( $tag, $content ) {
		if ( self::is_void_element_tag( $tag ) ) {
			$result = self::find_void_element_tag( $tag, $content );
			return array(
				'opening'     => $result['position'],
				'closing'     => $result['position'],
				'opening_tag' => $result['tag'],
				'closing_tag' => $result['tag'],
			);
		}

		$opening_tag = '<' . $tag . '>';
		$opening_pos = stripos( $content, $opening_tag );
		if ( false === $opening_pos ) {
			$opening_tag = '<' . $tag . ' ';
			$opening_pos = stripos( $content, $opening_tag );
		}

		$closing_tag = '</' . $tag . '>';
		$closing_pos = stripos( $content, $closing_tag );

		return array(
			'opening'     => $opening_pos,
			'closing'     => $closing_pos,
			'opening_tag' => $opening_tag,
			'closing_tag' => $closing_tag,
		);
	}

	/**
	 * Find the opening/closing positions of given tag, if found.
	 *
	 * @since 2.10.0
	 *
	 * @param  string $tag     The html tag.
	 * @param  string $content The html content to search.
	 *
	 * @return array|bool       Array of tag position data, if found.
	 */
	public static function find_tag( $tag, $content ) {
		$positions = self::get_tag_positions( $tag, $content );

		// Not found, move along.
		if ( false === $positions['closing'] ) {
			return false;
		}

		// If we found an opening tag but it comes before the closing,
		// then this is not the one we were looking at.
		if (
			false !== $positions['opening']
			&& $positions['opening'] < $positions['closing']
		) {
			return false;
		}

		return $positions;
	}

	/**
	 * Search for invalid tags within given content.
	 *
	 * @since 2.10.0
	 *
	 * @param  string $content html content to search.
	 *
	 * @return string           Invalid tag, if found.
	 */
	public static function find_invalid_word_tag( $content ) {
		// Check if it has any after_tags inside this block.
		// If so, then it must continue counting to the next paragraph.
		foreach ( explode( ',', self::INSERT_AFTER_TAGS ) as $tag ) {
			$positions = self::get_tag_positions( $tag, $content );

			// Not found, continue to the next
			if ( false === $positions['opening'] ) {
				continue;
			}

			// It has it, so it can ignore since it opens and closes inside the paragraph.
			// It also needs to check if the closing comes after the opening.
			if ( false !== $positions['closing'] && $positions['opening'] < $positions['closing'] ) {
				continue;
			}

			// It doesn't have a closing tag, so this paragraph lives inside an invalid tag.
			return $tag;
		}

		return '';
	}

	/**
	 * Find the given void element tag position/occurrence.
	 *
	 * @since 2.10.0
	 *
	 * @param  string $tag     The void element tag name.
	 * @param  string $content html content to search.
	 *
	 * @return array Array of found element occurrence and string position.
	 */
	public static function find_void_element_tag( $tag, $content ) {
		preg_match_all( '~<' . $tag . '.*?\/?>~i', $content, $matches );
		if ( ! empty( $matches[0][0] ) ) {
			return array(
				'tag'      => $matches[0][0],
				'position' => strpos( $content, $matches[0][0] ),
			);
		}

		return array(
			'tag'      => '<' . $tag . '/>',
			'position' => false,
		);
	}

	/**
	 * Check if given tag is a void element tag.
	 *
	 * @since 2.10.0
	 *
	 * @param  string $tag HTML tag name.
	 *
	 * @return boolean
	 */
	public static function is_void_element_tag( $tag ) {
		return in_array(
			strtolower( $tag ),
			array(
				'area',
				'base',
				'br',
				'col',
				'embed',
				'hr',
				'img',
				'input',
				'link',
				'meta',
				'param',
				'source',
				'track',
				'wbr',
				'command',
				'keygen',
				'menuitem',
			),
			true
		);
	}
}