<?php

namespace AcademicCrew\Collaborations;

/**
 * Admin-configurable project classes (stored in `_acc_project_type`).
 *
 * Ships with two defaults ("scientific" / "industrial") that mirror the
 * anchor slots FeaturedProjectsStripShortcode always looks for. Slugs are
 * permanent once created — renaming only changes the display label, so
 * existing `_acc_project_type` meta values never go stale. Additional
 * classes can be added; they behave like ordinary featured projects (no
 * anchor slot of their own).
 */
class ProjectClassRegistry {

    private const OPTION = 'academiccrew_project_classes';

    /** @return array<string,string> slug => translated default label */
    private static function default_entries(): array {
        return [
            'scientific' => __( 'Scientific', 'academiccrew' ),
            'industrial' => __( 'Industrial', 'academiccrew' ),
        ];
    }

    /** @return array<string,string> slug => label, in stored order */
    public static function all(): array {
        $stored = get_option( self::OPTION, null );
        return is_array( $stored ) ? $stored : self::default_entries();
    }

    public static function keys(): array {
        return array_keys( self::all() );
    }

    public static function label( string $slug ): string {
        return self::all()[ $slug ] ?? $slug;
    }

    public static function exists( string $slug ): bool {
        return isset( self::all()[ $slug ] );
    }

    /** @param array<string,string> $entries slug => label */
    public static function save( array $entries ): void {
        update_option( self::OPTION, $entries );
    }

    /** Number of published projects currently tagged with $slug. */
    public static function usage_count( string $slug ): int {
        $query = new \WP_Query( [
            'post_type'      => 'acc_collaboration',
            'post_status'    => 'any',
            'posts_per_page' => 1,
            'fields'         => 'ids',
            'no_found_rows'  => false,
            'meta_query'     => [ [ 'key' => '_acc_project_type', 'value' => $slug ] ], // phpcs:ignore WordPress.DB.SlowDBQuery
        ] );
        return (int) $query->found_posts;
    }
}