package com.alexanderlogistics.metrics;

import java.util.Objects;

import org.imixs.workflow.ItemCollection;
import org.imixs.workflow.engine.DocumentService;

import jakarta.annotation.security.DeclareRoles;
import jakarta.annotation.security.RunAs;
import jakarta.ejb.Stateless;
import jakarta.ejb.TransactionAttribute;
import jakarta.ejb.TransactionAttributeType;
import jakarta.inject.Inject;

/**
 * The MetricDataService provides methods to lookup and update metric data
 * objects.
 * The service runs with manager access.
 * 
 * 
 */
@DeclareRoles({ "org.imixs.ACCESSLEVEL.MANAGERACCESS" })
@RunAs("org.imixs.ACCESSLEVEL.MANAGERACCESS")
@Stateless
public class MetricDataService {

    @Inject
    DocumentService documentService;

    /**
     * Runs with Manager access
     * 
     * @param metricData
     */
    public void saveMetric(ItemCollection metricData) {
        documentService.save(metricData);
    }

    /**
     * This helper method reads a 'dirty' workitem in a new transaction. This is
     * used for calculating the new metric values
     * 
     * @param uniqueId
     */
    @TransactionAttribute(value = TransactionAttributeType.REQUIRES_NEW)
    public ItemCollection readDirtyWorkitem(String uniqueId) {
        ItemCollection dirtyInvoice = documentService.load(uniqueId);
        return dirtyInvoice;
    }

    /**
     * Builds the metric hash key by the invoice attributes. The returned key can be
     * used for caching the metric.
     * 
     * @param invoice - The invoice ItemCollection containing the necessary
     *                attributes
     * @return A unique hash string based on the invoice attributes
     * @throws IllegalArgumentException if the invoice is null
     */
    public static String buildKeyByInvoice(ItemCollection invoice) {
        // Validate input
        Objects.requireNonNull(invoice, "Invoice must not be null");
        String country = invoice.getItemValueString("invoice.country");
        String currency = invoice.getItemValueString("invoice.currency");
        String department = invoice.getItemValueString("space.name");

        // Concatenate the values and create a hash
        String combinedValue = String.format("%s::%s::%s",
                country,
                currency,
                department);

        String hash = String.valueOf(combinedValue.hashCode());
        // a hash can start with '-' which we need to avoid and create a alphanumeric
        // key instead!
        return "HASH" + hash;
    }

}