<?php

namespace AcademicCrew\Roles;

use AcademicCrew\Core\Loader;

/**
 * Grants `edit_post` capability to the WP user linked to a academiccrew_member post
 * so they can edit their own profile page (zone 3 only — zones 1 and 2 are injected).
 *
 * The user ID is stored in `_academiccrew_wp_user_id` on the member CPT.
 * The linked page ID is stored in `_academiccrew_linked_page_id` on the member CPT.
 */
class MemberPageCapabilities {

    public function register( Loader $loader ): void {
        $loader->add_filter( 'user_has_cap', $this, 'grant_member_page_edit', 10, 4 );
    }

    public function grant_member_page_edit(
        array $allcaps,
        array $caps,
        array $args,
        \WP_User $user
    ): array {
        // $caps holds the primitive caps the meta cap was mapped to, so the
        // requested meta cap itself is in $args[0].
        if ( ! in_array( $args[0] ?? '', [ 'edit_post', 'edit_page' ], true ) ) {
            return $allcaps;
        }

        $post_id = $args[2] ?? null;
        if ( ! $post_id || 'page' !== get_post_type( $post_id ) ) {
            return $allcaps;
        }

        // Is this a academiccrew member page?
        $member_id = (int) get_post_meta( $post_id, '_academiccrew_member_id', true );
        if ( ! $member_id ) {
            return $allcaps;
        }

        // Does the current user own this member profile?
        $owner_user_id = (int) get_post_meta( $member_id, '_academiccrew_wp_user_id', true );
        if ( $owner_user_id && $owner_user_id === $user->ID ) {
            // Grant the primitive caps this meta cap maps to (edit_pages,
            // edit_published_pages, …), for this one page only.
            foreach ( $caps as $cap ) {
                $allcaps[ $cap ] = true;
            }
        }

        return $allcaps;
    }
}