<?php

namespace WooOrderCart\Front\LocalPickup;

class LocalPickupSession {
    public const FIELD_NAME = 'ips_pickup_location';
    public const SESSION_KEY = 'ips_pickup_location_id';

    public static function get_selected_location_id(): int {
        if ( ! function_exists( 'WC' ) || ! WC()->session ) {
            return 0;
        }

        return absint( WC()->session->get( self::SESSION_KEY ) );
    }

    public static function set_selected_location_id( int $location_id ): void {
        if ( ! function_exists( 'WC' ) || ! WC()->session ) {
            return;
        }

        if ( $location_id > 0 ) {
            WC()->session->set( self::SESSION_KEY, $location_id );
            return;
        }

        self::clear_selected_location_id();
    }

    public static function clear_selected_location_id(): void {
        if ( ! function_exists( 'WC' ) || ! WC()->session ) {
            return;
        }

        WC()->session->__unset( self::SESSION_KEY );
    }

    /**
     * @param array<string,mixed> $posted_data
     */
    public static function sync_from_posted_data( array $posted_data ): void {
        $selected_shipping = self::extract_selected_shipping_method( $posted_data );
        if ( ! self::is_local_pickup_method( $selected_shipping ) ) {
            self::clear_selected_location_id();
            return;
        }

        $location_id = absint( $posted_data[ self::FIELD_NAME ] ?? 0 );
        self::set_selected_location_id( $location_id );
    }

    public static function is_local_pickup_method( string $shipping_method ): bool {
        return 0 === strpos( $shipping_method, 'local_pickup' );
    }

    /**
     * @param array<string,mixed> $posted_data
     */
    public static function extract_selected_shipping_method( array $posted_data ): string {
        $shipping_methods = $posted_data['shipping_method'] ?? [];

        if ( is_array( $shipping_methods ) ) {
            return isset( $shipping_methods[0] ) ? (string) $shipping_methods[0] : '';
        }

        return is_scalar( $shipping_methods ) ? (string) $shipping_methods : '';
    }
}