<?php declare(strict_types=1);

namespace TotalTheme;

use WPEX_Card;
use TotalTheme\Title;
use TotalTheme\Page\Header as Page_Header;

\defined( 'ABSPATH' ) || exit;

/**
 * Replace_Vars Class.
 */
final class Replace_Vars {

	/**
	 * Check if functionality is enabled.
	 *
	 * @return bool $check
	 */
	protected function is_enabled(): bool {
		return (bool) \apply_filters( 'totaltheme/replace_vars/is_enabled', true );
	}

	/**
	 * Replace `{{variable_placeholders}}` with their correct value.
	 *
	 * @param string $text The string to replace the variables in.
	 * @param array $args Arguments to pass to the replacement.
	 *
	 * @return mixed $replaced_value
	 */
	public function replace( string $text, array $args = [] ): string {
		if ( ! \is_string( $text )
			|| ! $this->is_enabled()
			|| ! \str_contains( $text, '{{' )
			|| ! \str_contains( $text, '}}' )
		) {
			return $text;
		}

		return \preg_replace_callback( "/\{\{([^}]*)}\}/", [ $this, 'handle_replacements' ], $text );
	}

	/**
	 * Returns the array of variables and their values.
	 *
	 * @return array
	 */
	private function get_vars(): array {
		$vars = [
			'current_url'        => '',
			'post_id'            => '',
			'post_rating'        => '',
			'post_author'        => '',
			'post_date'          => '',
			'post_modified'      => '',
			'post_title'         => '',
			'post_slug'          => '',
			'post_subheading'    => '',
			'post_excerpt'       => '',
			'post_content'       => '',
			'title'              => '',
			'taxonomy'           => '',
			'term_id'            => '',
			'term_name'          => '',
			'permalink'          => '',
			'category'           => '',
			'primary_term_id'    => '',
			'paged'              => '',
			'post_count'         => '',
			'card_icon'          => '',
			'card_running_count' => '',

			// @todo ?
		//	'author_first_name' => '',
		//	'author_last_name'  => '',
		//	'post_year'         => '',
		//	'post_month'        => '',
		//	'post_day'          => '',
		//	'currentdate'       => '',
		//	'currentyear'       => '',
		//	'currentmonth'      => '',
		//	'currentday'        => '',
		//	'max_num_pages'     => '',
		];

		/**
		 * Filters the available vars.
		 *
		 * @param array $vars List of vars.
		 */
		$vars = (array) \apply_filters( 'totaltheme/replace_vars/vars', $vars );

		return $vars;
	}

	/**
	 * Handles the variable replacement.
	 *
	 * @param array $matches The matches returned by preg_replace_callback
	 * @return mixed
	 */
	private function handle_replacements( $matches ) {
		$vars        = $this->get_vars();
		$replacement = $matches[0];
		$has_args    = $this->var_has_args( $matches[1] ?? '' );

		if ( \array_key_exists( $matches[1], $vars ) || $has_args ) {
			if ( ! $has_args && ! empty( $vars[$matches[1]] ) ) {
				$replacement = \is_callable( $vars[$matches[1]] ) ? \call_user_func( $vars[$matches[1]] ) : $vars[$matches[1]];
			} else {
				$method_suffix = $has_args ? \strtok( $matches[1], '_' ) : $matches[1];
				$method = 'get_' . $method_suffix;
				if ( \method_exists( $this, $method ) ) {
					if ( $has_args ) {
						$replacement = $this->$method( $matches[1] );
					} else {
						$replacement = $this->$method();
					}
				}
			}
		}

		if ( \is_null( $replacement ) || false === $replacement ) {
			$replacement = '';
		} elseif ( ! \is_scalar( $replacement ) ) {
			$replacement = $matches[0];
		}

		return $replacement;
	}

	/**
	 * Checks if the current variable has args.
	 *
	 * @return bool
	 */
	private function var_has_args( string $var ): bool {
		return ( \str_starts_with( $var, 'acf_' ) || \str_starts_with( $var, 'cf_' ) );
	}

	/**
	 * Get the current URL.
	 *
	 * @return string
	 */
	private function get_current_url(): string {
		return (string) \wpex_get_current_url();
	}

	/**
	 * Get the title var value.
	 *
	 * @return string
	 */
	private function get_title(): string {
		if ( ( \in_the_loop() || \get_query_var( 'wpex_card_object' ) ) ) {
			return (string) $this->get_post_title();
		} else {
			return Title::instance()->get();
		}
	}

	/**
	 * Get the post_title var value.
	 *
	 * @return string
	 */
	private function get_post_title(): string {
		return (string) \get_the_title();
	}

	/**
	 * Get the post id.
	 *
	 * @return int
	 */
	private function get_post_id(): int {
		return (int) \get_the_ID();
	}

	/**
	 * Get Post Rating.
	 *
	 * @return string
	 */
	private function get_post_rating(): string {
		$rating = \get_post_meta( \get_the_ID(), 'wpex_post_rating', true );
		if ( ! $rating && \function_exists( 'wc_get_product' ) && 'product' === \get_post_type() ) {
			$product = \wc_get_product( get_the_ID() );
			if ( $product && \is_callable( [ $product, 'get_average_rating' ] ) ) {
				$rating = $product->get_average_rating();
			}
		}
		return (string) $rating;
	}

	/**
	 * Get the category name.
	 *
	 * @return string
	 */
	private function get_category(): string {
		return (string) \wpex_get_first_term_name();
	}

	/**
	 * Get the primary term id.
	 *
	 * @return int
	 */
	private function get_primary_term_id(): ?int {
		return \wpex_get_first_term_id();
	}

	/**
	 * Get the post date.
	 *
	 * @return string
	 */
	private function get_post_date(): string {
		return (string) \get_the_date();
	}

	/**
	 * Get the post modified date.
	 *
	 * @return string
	 */
	private function get_post_modified(): string {
		return (string) \get_the_modified_date();
	}

	/**
	 * Get post slug.
	 *
	 * @return string
	 */
	private function get_post_slug(): string {
		return (string) \get_post_field( 'post_name', \get_post() );
	}

	/**
	 * Get the post permalink.
	 *
	 * @return string
	 */
	private function get_permalink(): string {
		return (string) \get_permalink();
	}

	/**
	 * Get the post author.
	 *
	 * @return string
	 */
	private function get_post_author(): string {
		return (string) \get_the_author();
	}

	/**
	 * Get the post subheading.
	 *
	 * @return string
	 */
	private function get_post_subheading(): string {
		return Page_Header::get_subheading();
	}

	/**
	 * Get the post content.
	 *
	 * @return string
	 */
	private function get_post_content(): string {
		$content = \get_the_content();
		if ( ! \str_contains( $content, '{{post_content}}' ) ) {
			return \wpex_the_content( $content );
		} else {
			return '';
		}
	}

	/**
	 * Get the post excerpt.
	 *
	 * @return string
	 */
	private function get_post_excerpt(): string {
		return (string) \get_the_excerpt() ?: '';
	}

	/**
	 * Get current taxonomy name.
	 *
	 * @return string|null
	 */
	private function get_taxonomy(): ?string {
		$obj = \get_queried_object();
		if ( \is_a( $obj, 'WP_Term' ) ) {
			$tax = \get_taxonomy( $obj->taxonomy );
			if ( \is_a( $tax, 'WP_Taxonomy' ) ) {
				return (string) $tax->labels->singular_name;
			}
		}
		return '';
	}

	/**
	 * Get current taxonomy term id
	 *
	 * @return int|null
	 */
	private function get_term_id(): ?int {
		return get_queried_object()->term_id ?? null;
	}

	/**
	 * Get current taxonomy term name.
	 *
	 * @return string
	 */
	private function get_term_name(): string {
		$obj = get_queried_object();
		return ( \is_a( $obj, 'WP_Term' ) && isset( $obj->name ) ) ? (string) $obj->name : '';
	}

	/**
	 * Get post count.
	 *
	 * @return int
	 */
	private function get_post_count(): ?int {
		global $wp_query;
		return ! empty( $wp_query->found_posts ) ? (int) $wp_query->found_posts : null;
	}

	/**
	 * Get paged text.
	 *
	 * @return string
	 */
	private function get_paged(): string {
		if ( \is_paged() ) {
			$paged = \get_query_var( 'paged' ) ?: \get_query_var( 'page' ) ?: 1;
			if ( $paged > 1 ) {
				global $wp_query;
				$max_num_pages = $wp_query->max_num_pages ?? 0;
				if ( $max_num_pages ) {
					return \sprintf( \esc_html__( 'Page %s of %s' ), $paged, $max_num_pages );
				} else {
					return \sprintf( \esc_html__( 'Page %s' ), $paged );
				}
			}
		}
		return '';
	}

	/**
	 * Get card Icon
	 *
	 * @return string
	 */
	private function get_card_icon(): string {
		return ( $card_instance = WPEX_Card::instance() ) ? (string) $card_instance->get_the_icon() : '';
	}

	/**
	 * Get card running count.
	 *
	 * @return int
	 */
	private function get_card_running_count(): int {
		return ( $card_instance = WPEX_Card::instance() ) ? (int) $card_instance->get_var( 'running_count' ) : 1;
	}

	/**
	 * Get custom field value.
	 *
	 * @return mixed
	 */
	private function get_cf( string $var ) {
		$key = \str_replace( 'cf_', '', $var );
		if ( $key ) {
			if ( \function_exists( 'get_field' ) ) {
				return \get_field( $key );
			}
			return \get_post_meta( \get_the_ID(), $key, true );
		}
	}

	/**
	 * Get acf field value.
	 *
	 * @param string $var
	 * @return mixed
	 */
	private function get_acf( string $var ) {
		$key = \str_replace( 'acf_', '', $var );
		if ( $key ) {
			if ( ! \function_exists( 'get_field' ) ) {
				return "{{{$var}}}";
			}
			return \get_field( $key ) ?: '';
		}
	}

}