import {Customer} from "@/services/customers/entities/customer";

export async function validateCustomer(input: {
    email: string;
    companyName: string;
    street: string;
    zip: string;
    city: string;
}): Promise<Customer[]> {
    if (Object.values(input).every(value => !value?.trim())) {
        return [];
    }

    const res = await fetch('/api/customers/validate', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify(input),
    });

    const contentType = res.headers.get("content-type") ?? "";
    const isJson = contentType.includes("application/json");

    const rawBody = isJson ? await res.json() : await res.text();

    console.log(`[api /api/customers/validate] Response:`, res.status, rawBody);

    if (!res.ok) {
        const errorMessage = isJson
            ? (rawBody?.message ?? rawBody?.errors?.join(", ")) ?? "Unbekannter Fehler"
            : String(rawBody);
        
        // Log correlation ID if available for debugging
        if (isJson && rawBody?.correlationId) {
            console.error(`[api /api/customers/validate] Error occurred [${rawBody.correlationId}]:`, errorMessage);
        }
        
        throw new Error(errorMessage);
    }

    return rawBody as Customer[];
}