<?php

namespace WooOrderCart\Front\Checkout;

class CheckoutCustomerProfileResolver {
    /**
     * @return array<string,array<string,string>>
     */
    public static function resolve( int $user_id, string $user_email = '', $checkout = null ): array {
        if ( $user_id <= 0 || ! function_exists( 'WC' ) ) {
            return [
                'billing_address'  => [],
                'shipping_address' => [],
            ];
        }

        $customer = new \WC_Customer( $user_id );
        $user     = get_userdata( $user_id );

        $account_first_name = $user instanceof \WP_User ? trim( (string) $user->first_name ) : '';
        $account_last_name  = $user instanceof \WP_User ? trim( (string) $user->last_name ) : '';

        $billing = [
            'first_name' => self::resolve_checkout_value(
                $checkout,
                'billing_first_name',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_first_name', 'billing_first_name', $account_first_name )
            ),
            'last_name'  => self::resolve_checkout_value(
                $checkout,
                'billing_last_name',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_last_name', 'billing_last_name', $account_last_name )
            ),
            'company'    => self::resolve_checkout_value(
                $checkout,
                'billing_company',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_company', 'billing_company' )
            ),
            'address_1'  => self::resolve_checkout_value(
                $checkout,
                'billing_address_1',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_address_1', 'billing_address_1' )
            ),
            'address_2'  => self::resolve_checkout_value(
                $checkout,
                'billing_address_2',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_address_2', 'billing_address_2' )
            ),
            'city'       => self::resolve_checkout_value(
                $checkout,
                'billing_city',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_city', 'billing_city' )
            ),
            'state'      => self::resolve_checkout_value(
                $checkout,
                'billing_state',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_state', 'billing_state' )
            ),
            'postcode'   => self::resolve_checkout_value(
                $checkout,
                'billing_postcode',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_postcode', 'billing_postcode' )
            ),
            'country'    => self::resolve_checkout_value(
                $checkout,
                'billing_country',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_country', 'billing_country' )
            ),
            'phone'      => self::resolve_checkout_value(
                $checkout,
                'billing_phone',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_phone', 'billing_phone' )
            ),
            'email'      => self::resolve_checkout_value(
                $checkout,
                'billing_email',
                self::resolve_customer_value( $user_id, $customer, 'get_billing_email', 'billing_email', $user_email ),
                $user_email
            ),
        ];

        $shipping = [
            'first_name' => self::resolve_checkout_value(
                $checkout,
                'shipping_first_name',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_first_name', 'shipping_first_name', $billing['first_name'] ),
                $billing['first_name']
            ),
            'last_name'  => self::resolve_checkout_value(
                $checkout,
                'shipping_last_name',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_last_name', 'shipping_last_name', $billing['last_name'] ),
                $billing['last_name']
            ),
            'company'    => self::resolve_checkout_value(
                $checkout,
                'shipping_company',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_company', 'shipping_company', $billing['company'] ),
                $billing['company']
            ),
            'address_1'  => self::resolve_checkout_value(
                $checkout,
                'shipping_address_1',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_address_1', 'shipping_address_1', $billing['address_1'] ),
                $billing['address_1']
            ),
            'address_2'  => self::resolve_checkout_value(
                $checkout,
                'shipping_address_2',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_address_2', 'shipping_address_2', $billing['address_2'] ),
                $billing['address_2']
            ),
            'city'       => self::resolve_checkout_value(
                $checkout,
                'shipping_city',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_city', 'shipping_city', $billing['city'] ),
                $billing['city']
            ),
            'state'      => self::resolve_checkout_value(
                $checkout,
                'shipping_state',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_state', 'shipping_state', $billing['state'] ),
                $billing['state']
            ),
            'postcode'   => self::resolve_checkout_value(
                $checkout,
                'shipping_postcode',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_postcode', 'shipping_postcode', $billing['postcode'] ),
                $billing['postcode']
            ),
            'country'    => self::resolve_checkout_value(
                $checkout,
                'shipping_country',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_country', 'shipping_country', $billing['country'] ),
                $billing['country']
            ),
            'phone'      => self::resolve_checkout_value(
                $checkout,
                'shipping_phone',
                self::resolve_customer_value( $user_id, $customer, 'get_shipping_phone', 'shipping_phone', $billing['phone'] ),
                $billing['phone']
            ),
        ];

        return [
            'billing_address'  => $billing,
            'shipping_address' => $shipping,
        ];
    }

    private static function resolve_customer_value( int $user_id, \WC_Customer $customer, string $getter, string $meta_key, string $secondary_fallback = '' ): string {
        $value = '';

        if ( is_callable( [ $customer, $getter ] ) ) {
            $resolved = $customer->{$getter}();

            if ( is_string( $resolved ) ) {
                $value = trim( $resolved );
            }
        }

        if ( '' !== $value ) {
            return $value;
        }

        $meta_value = get_user_meta( $user_id, $meta_key, true );

        if ( is_string( $meta_value ) ) {
            $meta_value = trim( $meta_value );

            if ( '' !== $meta_value ) {
                return $meta_value;
            }
        }

        return trim( $secondary_fallback );
    }

    private static function resolve_checkout_value( $checkout, string $field, string $fallback = '', string $secondary_fallback = '' ): string {
        $value = '';

        if ( $checkout && is_callable( [ $checkout, 'get_value' ] ) ) {
            $resolved = $checkout->get_value( $field );

            if ( is_string( $resolved ) ) {
                $value = trim( $resolved );
            }
        }

        if ( '' !== $value ) {
            return $value;
        }

        $fallback = trim( $fallback );

        if ( '' !== $fallback ) {
            return $fallback;
        }

        return trim( $secondary_fallback );
    }
}