<?php

namespace AIEO\Claude\Abilities;

defined( 'ABSPATH' ) || exit;

class FindNeedGapsAbility {

	const ABILITY_NAME = 'aieo/find-need-gaps';

	public static function register() {
		wp_register_ability(
			self::ABILITY_NAME,
			array(
				'label'               => __( 'Find need gaps', 'ai-eshop-optimizer' ),
				'description'         => __( "Return `pa_need` taxonomy terms with fewer than the threshold number of products. These are the 'thin' needs whose archive pages won't drive conversion until more SKUs carry the tag.", 'ai-eshop-optimizer' ),
				'category'            => \AIEO\Claude\Bootstrap::CATEGORY,
				'input_schema'        => self::input_schema(),
				'output_schema'       => array( 'type' => 'object' ),
				'execute_callback'    => array( __CLASS__, 'execute' ),
				'permission_callback' => array( __CLASS__, 'permission_check' ),
				'meta'                => array(
					'annotations'  => array(
						'readonly'   => true,
						'idempotent' => true,
					),
					'show_in_rest' => true,
				),
			)
		);
	}

	public static function permission_check( $input = null ) {
		unset( $input );
		return current_user_can( 'manage_woocommerce' );
	}

	private static function input_schema() {
		return array(
			'default'    => array(),
			'type'       => 'object',
			'properties' => array(
				'threshold' => array(
					'type'        => 'integer',
					'minimum'     => 1,
					'maximum'     => 100,
					'default'     => 3,
					'description' => 'Maximum product count for a term to count as a gap. Defaults to 3.',
				),
			),
		);
	}

	public static function execute( $input ) {
		$input     = is_array( $input ) ? $input : array();
		$threshold = isset( $input['threshold'] ) ? max( 1, min( 100, (int) $input['threshold'] ) ) : 3;
		$taxonomy  = apply_filters( 'aieo_dmm_needs_taxonomy', 'pa_need' );
		if ( ! taxonomy_exists( $taxonomy ) ) {
			return array( 'taxonomy' => $taxonomy, 'gaps' => array(), 'threshold' => $threshold );
		}

		$terms = get_terms(
			array(
				'taxonomy'   => $taxonomy,
				'hide_empty' => false,
				'orderby'    => 'count',
				'order'      => 'ASC',
			)
		);
		if ( is_wp_error( $terms ) ) {
			return $terms;
		}

		$gaps = array();
		foreach ( (array) $terms as $t ) {
			$count = (int) $t->count;
			if ( $count < $threshold ) {
				$gaps[] = array(
					'term_id'       => (int) $t->term_id,
					'name'          => (string) $t->name,
					'slug'          => (string) $t->slug,
					'product_count' => $count,
					'archive_url'   => get_term_link( $t ),
				);
			}
		}

		return array(
			'taxonomy'  => $taxonomy,
			'threshold' => $threshold,
			'gaps'      => $gaps,
			'total'     => count( $gaps ),
		);
	}
}