<?php
/**
 * Goals service.
 *
 * @package Extrova
 */

declare( strict_types=1 );

namespace Extrova\Goals;

use Extrova\Core\Context;
use Extrova\Core\SettingsRepository;

defined( 'ABSPATH' ) || exit;

/**
 * Collects and evaluates goals. The Lite exposes a single goal (free shipping).
 *
 * @since 1.0.0
 */
final class GoalService {

	/**
	 * Constructor.
	 *
	 * @param SettingsRepository $settings      Settings.
	 * @param FreeShippingGoal   $free_shipping Free shipping goal.
	 */
	public function __construct(
		private SettingsRepository $settings,
		private FreeShippingGoal $free_shipping
	) {}

	/**
	 * Goals for a context.
	 *
	 * @param Context $context Context.
	 * @return GoalInterface[]
	 */
	public function goals( Context $context ): array {
		$goals = $this->settings->bar_enabled() ? array( $this->free_shipping ) : array();

		/**
		 * Filters the goals shown in progress bars.
		 *
		 * @since 1.0.0
		 *
		 * @param GoalInterface[] $goals   Goals.
		 * @param Context         $context Context.
		 */
		$goals = apply_filters( 'extrova_goals', $goals, $context );

		return array_values(
			array_filter(
				(array) $goals,
				static fn( mixed $goal ): bool => $goal instanceof GoalInterface
			)
		);
	}

	/**
	 * Evaluated goals: list of { id, threshold, current, remaining, reached, message }.
	 *
	 * @param Context $context Context.
	 */
	public function evaluate_all( Context $context ): array {
		$results = array();
		foreach ( $this->goals( $context ) as $goal ) {
			$result = $goal->evaluate( $context );
			if ( is_array( $result ) ) {
				$results[] = array_merge( array( 'id' => $goal->id() ), $result );
			}
		}
		return $results;
	}

	/**
	 * Whether goal assets may be needed (bar enabled or goals added by add-ons).
	 */
	public function may_have_goals(): bool {
		return $this->settings->bar_enabled() || has_filter( 'extrova_goals' );
	}
}