<?php

namespace Brandy\Utils;

class Breadcrumbs {

	protected $crumbs = array();

	public function add_crumb( $name, $link = '' ) {
		$this->crumbs[] = array(
			wp_strip_all_tags( $name ),
			$link,
		);
	}

	/**
	 * Reset crumbs.
	 */
	public function reset() {
		$this->crumbs = array();
	}

	/**
	 * Get the breadcrumb.
	 *
	 * @return array
	 */
	public function get_breadcrumb() {
		return $this->crumbs;
	}

	/**
	 * Generate breadcrumb trail.
	 *
	 * @return array of breadcrumbs
	 */
	public function generate() {
		$conditionals = array(
			'is_home',
			'is_404',
			'is_attachment',
			'is_single',
			'is_page',
			'is_post_type_archive',
			'is_category',
			'is_tag',
			'is_author',
			'is_date',
			'is_tax',
		);

		if ( ( ! is_front_page() ) || is_paged() ) {
			foreach ( $conditionals as $conditional ) {
				if ( call_user_func( $conditional ) ) {
					call_user_func( array( $this, 'add_crumbs_' . substr( $conditional, 3 ) ) );
					break;
				}
			}

			$this->search_trail();
			$this->paged_trail();

			return $this->get_breadcrumb();
		}

		return array();
	}

	protected function add_crumbs_home() {
		$this->add_crumb( single_post_title( '', false ) );
	}

	protected function add_crumbs_404() {
		$this->add_crumb( __( 'Error 404', 'brandy' ) );
	}

	protected function add_crumbs_attachment() {
		global $post;

		$this->add_crumbs_single( $post->post_parent, get_permalink( $post->post_parent ) );
		$this->add_crumb( get_the_title(), get_permalink() );
	}

	protected function add_crumbs_single( $post_id = 0, $permalink = '' ) {
		if ( ! $post_id ) {
			global $post;
		} else {
			$post = get_post( $post_id ); // WPCS: override ok.
		}

		if ( ! $permalink ) {
			$permalink = get_permalink( $post );
		}

		if ( 'post' !== get_post_type( $post ) ) {
			$post_type = get_post_type_object( get_post_type( $post ) );

			if ( ! empty( $post_type->has_archive ) ) {
				$this->add_crumb( $post_type->labels->singular_name, get_post_type_archive_link( get_post_type( $post ) ) );
			}
		} else {
			$cat = current( get_the_category( $post ) );
			if ( $cat ) {
				$this->term_ancestors( $cat->term_id, 'category' );
				$this->add_crumb( $cat->name, get_term_link( $cat ) );
			}
		}

		$this->add_crumb( get_the_title( $post ), $permalink );
	}

	protected function add_crumbs_page() {
		global $post;

		if ( $post->post_parent ) {
			$parent_crumbs = array();
			$parent_id     = $post->post_parent;

			while ( $parent_id ) {
				$page            = get_post( $parent_id );
				$parent_id       = $page->post_parent;
				$parent_crumbs[] = array( get_the_title( $page->ID ), get_permalink( $page->ID ) );
			}

			$parent_crumbs = array_reverse( $parent_crumbs );

			foreach ( $parent_crumbs as $crumb ) {
				$this->add_crumb( $crumb[0], $crumb[1] );
			}
		}

		$this->add_crumb( get_the_title(), get_permalink() );
		$this->endpoint_trail();
	}

	/**
	 * Add crumbs for a term.
	 *
	 * @param int    $term_id  Term ID.
	 * @param string $taxonomy Taxonomy.
	 */
	protected function term_ancestors( $term_id, $taxonomy ) {
		$ancestors = get_ancestors( $term_id, $taxonomy );
		$ancestors = array_reverse( $ancestors );

		foreach ( $ancestors as $ancestor ) {
			$ancestor = get_term( $ancestor, $taxonomy );

			if ( ! is_wp_error( $ancestor ) && $ancestor ) {
				$this->add_crumb( $ancestor->name, get_term_link( $ancestor ) );
			}
		}
	}

	protected function endpoint_trail() {
		$this->add_crumb( 'test' );
	}

	protected function search_trail() {
		if ( is_search() ) {
			/* translators: %s: search term */
			$this->add_crumb( sprintf( __( 'Search results for &ldquo;%s&rdquo;', 'brandy' ), get_search_query() ), remove_query_arg( 'paged' ) );
		}
	}

	protected function paged_trail() {
		if ( get_query_var( 'paged' ) ) {
			/* translators: %d: page number */
			$this->add_crumb( sprintf( __( 'Page %d', 'brandy' ), get_query_var( 'paged' ) ) );
		}
	}
}