<?php
/**
 * Combines installed plugins with check results.
 *
 * @package Brachmelder
 */

namespace Brachmelder;

use Brachmelder\Check\Status;

defined( 'ABSPATH' ) || exit;

/**
 * Builds the rows shown on the admin page, in Site Health and in notices.
 */
class Report {

	/**
	 * Result storage.
	 *
	 * @var ResultStore
	 */
	private $store;

	/**
	 * Alternatives lookup.
	 *
	 * @var Alternatives
	 */
	private $alternatives;

	/**
	 * Rows cached for the current request.
	 *
	 * @var array<int, array<string, mixed>>|null
	 */
	private $rows;

	/**
	 * Constructor.
	 *
	 * @param ResultStore  $store        Result storage.
	 * @param Alternatives $alternatives Alternatives lookup.
	 */
	public function __construct( ResultStore $store, Alternatives $alternatives ) {
		$this->store        = $store;
		$this->alternatives = $alternatives;
	}

	/**
	 * One row per installed plugin, most severe first.
	 *
	 * @return array<int, array<string, mixed>>
	 */
	public function rows(): array {
		if ( null !== $this->rows ) {
			return $this->rows;
		}

		if ( ! function_exists( 'get_plugins' ) ) {
			require_once ABSPATH . 'wp-admin/includes/plugin.php';
		}

		$results = $this->store->get_results();
		$rows    = array();

		foreach ( get_plugins() as $file => $data ) {
			$result = $results['plugins'][ $file ] ?? array( 'status' => Status::PENDING );
			$row    = $result + array(
				'file'          => (string) $file,
				'local_name'    => (string) ( $data['Name'] ?? $file ),
				'local_version' => (string) ( $data['Version'] ?? '' ),
				'active'        => is_plugin_active( (string) $file ),
				'slug'          => '',
				'alternatives'  => array(),
			);

			$row['light']    = Status::light( (string) $row['status'] );
			$row['critical'] = Status::is_critical( $row );

			if ( in_array( $row['status'], array( Status::CLOSED, Status::ABANDONED ), true ) ) {
				$row['alternatives'] = $this->alternatives->find( (string) $row['slug'], $row['local_name'] );
			}

			$rows[] = $row;
		}

		usort(
			$rows,
			static function ( array $a, array $b ): int {
				$weight = array( (int) ! $a['critical'], Status::WEIGHT[ $a['status'] ] ?? 9, strtolower( $a['local_name'] ) )
					<=> array( (int) ! $b['critical'], Status::WEIGHT[ $b['status'] ] ?? 9, strtolower( $b['local_name'] ) );
				return $weight;
			}
		);

		$this->rows = $rows;
		return $rows;
	}

	/**
	 * Rows filtered by status.
	 *
	 * @param string[] $statuses Statuses.
	 * @return array<int, array<string, mixed>>
	 */
	public function rows_with_status( array $statuses ): array {
		return array_values(
			array_filter(
				$this->rows(),
				static function ( array $row ) use ( $statuses ): bool {
					return in_array( $row['status'], $statuses, true );
				}
			)
		);
	}

	/**
	 * Critical rows (closed because of a security issue).
	 *
	 * @return array<int, array<string, mixed>>
	 */
	public function critical_rows(): array {
		return array_values(
			array_filter(
				$this->rows(),
				static function ( array $row ): bool {
					return $row['critical'];
				}
			)
		);
	}

	/**
	 * Number of plugins per traffic light colour.
	 *
	 * @param array<int, array<string, mixed>> $rows Rows.
	 * @return array<string, int>
	 */
	public static function count_lights( array $rows ): array {
		$counts = array(
			Status::RED    => 0,
			Status::YELLOW => 0,
			Status::GREEN  => 0,
			Status::GREY   => 0,
		);
		foreach ( $rows as $row ) {
			++$counts[ $row['light'] ];
		}
		return $counts;
	}
}