package com.alexanderlogistics.ksef.api;

import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
import static org.mockito.Mockito.when;

import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.time.LocalDate;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.Logger;

import org.imixs.workflow.FileData;
import org.imixs.workflow.ItemCollection;
import org.imixs.workflow.engine.DocumentService;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.junit.jupiter.MockitoExtension;

import com.alexanderlogistics.BusinessPartnerService;
import com.alexanderlogistics.InvoiceService;
import com.alexanderlogistics.TestLoggerConfig;
import com.alexanderlogistics.einvoice.KSeFAdapter;

/**
 * Der KSeFAdapterTest prüft die Umwandlung einer Rechnung in die KSeF XML
 * Struktur.
 * 
 * Der Test simuliert eine Invoice und ruft dann den KSeFAdapter an um ein
 * Output File zu erzeugen.
 * <p>
 * Zum validieren kann man dann den validate_xml.sh Script hernehmen
 * 
 */

@ExtendWith(MockitoExtension.class)
public class KSeFAdapterTest {

    private static Logger logger = Logger.getLogger(KSeFAdapterTest.class.getName());

    private static final String TEMPLATE_FILE = "ksef/ksef.xml";

    ItemCollection businessPartner;

    @Mock
    private BusinessPartnerService businessPartnerService;

    @Mock
    private DocumentService documentService;

    @Mock
    private InvoiceService invoiceService;

    @InjectMocks
    private KSeFAdapter adapter;

    @BeforeEach
    void setup() throws Exception {

        TestLoggerConfig.setupTestLogger();

        // Prepare mock business partner
        businessPartner = new ItemCollection();
        businessPartner.setItemValue("partner.name", "Test Sp. z o.o.");
        businessPartner.setItemValue("partner.country", "PL");
        businessPartner.setItemValue("partner.city", "Warszawa");
        businessPartner.setItemValue("partner.zip", "00-001");
        businessPartner.setItemValue("partner.address", "ul. Testowa 1");
        businessPartner.setItemValue("partner.vat", "PL1234567890");
        businessPartner.setItemValue("dbtr.number", "D-12345");
    }

    /**
     * Erzeugt ein lokales XML File zum testen
     */
    @Test
    @DisplayName("Test Simple Invoice")
    public void testSimpleInvoice() throws Exception {
        logger.info("==> Test: Upload Invoice XML");

        // Prepare a workitem with typical invoice data
        ItemCollection workitem = new ItemCollection();
        workitem.setItemValue("invoice.number", "FV/2025/001");
        workitem.setItemValue("invoice.date", LocalDate.of(2025, 2, 10));
        workitem.setItemValue("invoice.duedate", LocalDate.of(2025, 3, 10));
        workitem.setItemValue("invoice.currency", "PLN");
        workitem.setItemValue("invoice.total.net", 10000.00);
        workitem.setItemValue("invoice.total.tax", 23.0);
        workitem.setItemValue("invoice.total", 12300.00);
        workitem.setItemValue("invoice.correction", "false");
        workitem.setItemValue("invoice.CorrectionInvoiceNumber", "");
        workitem.setItemValue("partner.id", "BP-001");
        workitem.setItemValue("partner.vat", "PL1234567890");
        workitem.setItemValue("invoice.performancedate", new Date());

        // Prepare child items (invoice line items)
        List<Object> childItems = new ArrayList<>();
        ItemCollection lineItem1 = new ItemCollection();
        lineItem1.setItemValue("numpos", "1");
        lineItem1.setItemValue("datev.text", "Transport Berlin - Warsaw");
        lineItem1.setItemValue("datev.umsatz", 6000.00);
        childItems.add(lineItem1.getAllItems());

        ItemCollection lineItem2 = new ItemCollection();
        lineItem2.setItemValue("numpos", "2");
        lineItem2.setItemValue("datev.text", "Customs handling");
        lineItem2.setItemValue("datev.umsatz", 4000.00);
        childItems.add(lineItem2.getAllItems());

        workitem.setItemValue("_childitems", childItems);

        // Arrange
        when(businessPartnerService.getBusinessPartnerByID("BP-001"))
                .thenReturn(businessPartner);

        FileData xmlTemplate = loadTemplateFromResources(TEMPLATE_FILE);

        // Act
        adapter.updateEInvoice(xmlTemplate, workitem);

        // Assert - basic checks
        assertNotNull(xmlTemplate.getContent(), "XML content should not be null after update");
        assertTrue(xmlTemplate.getContent().length > 0, "XML content should not be empty");

        // Write output for manual inspection
        writeOutputToResources(xmlTemplate, "invoice-simple.xml");

    }

    /**
     * Erzeugt ein lokales XML File zum testen
     */
    @Test
    @DisplayName("Test Invoice Korrektur")
    public void testInvoiceKorektur() throws Exception {
        logger.info("==> Test: Upload Invoice XML");

        // Prepare a workitem with typical invoice data
        ItemCollection workitem = new ItemCollection();
        workitem.setItemValue("invoice.number", "FV/2025/001");
        workitem.setItemValue("invoice.date", LocalDate.of(2025, 2, 10));
        workitem.setItemValue("invoice.duedate", LocalDate.of(2025, 3, 10));
        workitem.setItemValue("invoice.currency", "EUR");
        workitem.setItemValue("invoice.total.net", 0.00);
        workitem.setItemValue("invoice.total.tax", 0.0);
        workitem.setItemValue("invoice.total", 0.00);

        workitem.setItemValue("partner.id", "BP-001");
        workitem.setItemValue("partner.vat", "PL1234567890");

        // simulation Korrekturrechnung
        workitem.setItemValue("invoice.correction", true);
        workitem.setItemValue("invoice.CorrectionInvoiceNumber", "6551");
        workitem.setItemValue("invoice.performancedate", new Date());
        // Prepare child items (invoice line items)
        List<Object> childItems = new ArrayList<>();

        ItemCollection lineItem1 = new ItemCollection()
                .setItemValue("numpos", "1")
                .setItemValue("datev.shzeichen", "H")
                .setItemValue("datev.kurs", 0.236485)
                .setItemValue("datev.basisumsatz", -3805.74)
                .setItemValue("datev.text", "Transport Berlin - Warsaw")
                .setItemValue("billingtext", "usługa spedycyjna / transport w relacji, PL63 - CZ43")
                .setItemValue("datev.umsatz", -900.00)
                .setItemValue("datev.wkz", "EUR")
                .setItemValue("billingcode", "TRANSLKW");

        childItems.add(lineItem1.getAllItems());

        /**
         * <NrWierszaFa>1</NrWierszaFa>
         * <UU_ID>7f846436-7c29-48b3-8f5a-fed996ea30a3</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>0.00</P_9A>
         * <P_11>0.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>2</NrWierszaFa>
         * <UU_ID>f3077e37-9198-4431-a82b-68d9439b587e</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>-900.00</P_9A>
         * <P_11>-900.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>3</NrWierszaFa>
         * <UU_ID>31fdfe9e-671e-42f6-9f7e-ceb227a3a42c</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>0.00</P_9A>
         * <P_11>0.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>4</NrWierszaFa>
         * <UU_ID>79ffd1e8-be87-478b-97b5-d37aa302d090</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>0.00</P_9A>
         * <P_11>0.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>5</NrWierszaFa>
         * <UU_ID>38e8cbd3-e558-4b0e-875c-c4f2d96d1659</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>900.00</P_9A>
         * <P_11>900.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>6</NrWierszaFa>
         * <UU_ID>3774dab3-b6c4-433e-8298-60ecf6cbab74</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>0.00</P_9A>
         * <P_11>0.00</P_11>
         * </FaWiersz>
         * <FaWiersz>
         * <NrWierszaFa>7</NrWierszaFa>
         * <UU_ID>f19846ab-3567-4e5d-823b-807d474af062</UU_ID>
         * <P_7>IM-POL-2512-008</P_7>
         * <P_8A>szt.</P_8A>
         * <P_8B>1</P_8B>
         * <P_9A>0.00</P_9A>
         * <P_11>0.00</P_11>
         */

        workitem.setItemValue("_childitems", childItems);

        // Arrange
        when(businessPartnerService.getBusinessPartnerByID("BP-001"))
                .thenReturn(businessPartner);

        FileData xmlTemplate = loadTemplateFromResources(TEMPLATE_FILE);

        // Act
        adapter.updateEInvoice(xmlTemplate, workitem);

        // Assert - basic checks
        assertNotNull(xmlTemplate.getContent(), "XML content should not be null after update");
        assertTrue(xmlTemplate.getContent().length > 0, "XML content should not be empty");

        // Write output for manual inspection
        writeOutputToResources(xmlTemplate, "test-korrekturrechnung.xml");

    }

    // ── Helper methods ──────────────────────────────────────────────

    /**
     * Load the KSeF XML template from src/test/resources.
     */
    private FileData loadTemplateFromResources(String filename) {
        try (InputStream is = getClass().getClassLoader().getResourceAsStream(filename)) {
            if (is == null) {
                fail("Template file not found in test resources: " + filename
                        + "\nPlease place your KSeF XML template at: src/test/resources/" + filename);
            }
            byte[] content = is.readAllBytes();
            return new FileData(filename, content, "application/xml", null);
        } catch (IOException e) {
            fail("Failed to read template: " + e.getMessage());
            return null;
        }
    }

    /**
     * Write the resulting XML to src/test/resources/output/ for manual inspection.
     */
    private void writeOutputToResources(FileData fileData, String filename) throws IOException {
        Path outputDir = Paths.get("src", "test", "resources", "ksef/output");
        Files.createDirectories(outputDir);
        Path outputPath = outputDir.resolve(filename);
        Files.write(outputPath, fileData.getContent());
        System.out.println("──────────────────────────────────────────────");
        System.out.println("Output written to: " + outputPath.toAbsolutePath());
        System.out.println("──────────────────────────────────────────────");
    }
}