package com.alexanderlogistics;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;

import org.apache.poi.ss.usermodel.CellCopyPolicy;
import org.apache.poi.ss.usermodel.Row.MissingCellPolicy;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFFormulaEvaluator;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.imixs.workflow.FileData;
import org.imixs.workflow.ItemCollection;
import org.imixs.workflow.engine.DocumentService;
import org.imixs.workflow.engine.WorkflowService;
import org.imixs.workflow.exceptions.AdapterException;
import org.imixs.workflow.exceptions.PluginException;
import org.imixs.workflow.exceptions.QueryException;
import org.imixs.workflow.office.config.ConfigService;
import org.imixs.workflow.poi.POIFindReplaceAdapter;
import org.imixs.workflow.poi.POIUtil;
import org.imixs.workflow.util.XMLParser;

import jakarta.inject.Inject;

/**
 * Der AGLAnalyticExcelAdapterDebitor exportiert eine Excel Datei aus einem
 * Textblock und fügt die offenen Recnungen ein
 *
 * Der Adapter wird im Modell wie folgt konfiguriert
 * 
 * <pre>
 * {@code
        <soa name="excel-export">
            <textblock>textblock-ref</textblock>
            <template>filename</template>
            <targetname>filename</targetname>
        </soa> 
   }
 * </pre>
 * 
 * <p>
 * Der Adapter erweitert den POIAdapter somit können Felder aktualisiert werden
 * (siehe POIFineReplaceAdapter).
 * 
 * <p>
 * Der Adapter kopiert die ausgangsrechnungen in neue Zeilen, welche ab
 * Zeilennummer
 * 16 eingefügt werden.
 * <p>
 * 
 * Abschliessend wird die Zelle 'TOTAL' noch aktualisiert.
 * 
 * 
 * @version 1.0
 * @author rsoika
 */
public class AGLAnalyticExcelAdapterDebitor extends POIFindReplaceAdapter {

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

    @Inject
    WorkflowService workflowService;

    @Inject
    InvoiceService invoiceService;

    @Inject
    DocumentService documentService;

    @Inject
    ConfigService configService;

    /**
     * This method
     * 
     * @throws PluginException
     */
    @SuppressWarnings("unchecked")
    @Override
    public ItemCollection execute(ItemCollection document, ItemCollection event)
            throws AdapterException, PluginException {

        // ermittle die Hauptwährungen
        List<String> currencyList = invoiceService.getCurrenciesOut();

        // read the options
        ItemCollection ausgangsrechnungConfig = workflowService.evalWorkflowResult(event, "soa",
                document,
                false);
        if (ausgangsrechnungConfig == null || !ausgangsrechnungConfig.hasItem("excel-export")) {
            throw new PluginException(AGLAnalyticExcelAdapterDebitor.class.getSimpleName(), CONFIG_ERROR,
                    "missing soa configuration in model event - please check model configuration");
        }
        List<String> excelDefList = ausgangsrechnungConfig.getItemValue("excel-export");
        ItemCollection excelDefCollection = XMLParser.parseItemStructure(excelDefList.get(0));

        String textblock = excelDefCollection.getItemValueString("textblock");
        String template = excelDefCollection.getItemValueString("template");
        String targetName = excelDefCollection.getItemValueString("target-name");

        // adapt text....
        targetName = workflowService.adaptText(targetName, document);

        try {
            FileData fileData = appendExcelTemplate(document, textblock, template, targetName);

            // get workbook
            XSSFWorkbook doc = null;
            try (InputStream imputStream = new ByteArrayInputStream(fileData.getContent())) {
                doc = new XSSFWorkbook(imputStream);
                // NOTE: we only take the first sheet !
                XSSFSheet sheet = doc.getSheetAt(0);

                // first add the columns for the currency list
                addCurrencyColumns(doc, sheet, currencyList);
                // add rows
                insertInvoiceRows(sheet, document, currencyList);

                // write back the updated excel file
                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                doc.write(byteArrayOutputStream);

                byte[] newContent = byteArrayOutputStream.toByteArray();
                FileData fileDataNew = new FileData(fileData.getName(), newContent, fileData.getContentType(),
                        null);
                document.addFileData(fileDataNew);
                logger.finest("......new document added");

            } catch (IOException | QueryException e) {
                throw new PluginException(AGLAnalyticExcelAdapter.class.getSimpleName(),
                        InvoiceService.ERROR_CONFIG,
                        "failed to update opliste: " + e.getMessage());
            } finally {
                if (doc != null) {
                    try {
                        doc.close();
                    } catch (IOException e) {
                        logger.severe("Failed to close workbook: " + e.getMessage());
                        e.printStackTrace();
                    }
                }
            }

            // Finally process POI instructions
            processPOIUpdate(document, event, targetName);

        } catch (PluginException e) {
            throw new PluginException(AGLAnalyticExcelAdapter.class.getSimpleName(),
                    InvoiceService.ERROR_CONFIG,
                    "failed to update steuerbescheide: " + e.getMessage());
        }
        logger.info("... completed!");
        return document;
    }

    /**
     * A SOA can be created for one or multiple currencies. This helper method adds
     * the Total and Saldo Colum for each currency
     *
     * The template provided only the columns for the first currency.
     * 
     * @param sheet
     * @param currencyList
     */
    private void addCurrencyColumns(XSSFWorkbook doc, XSSFSheet sheet, List<String> currencyList) {
        if (currencyList == null || currencyList.size() <= 1) {
            // no extra currencies defined!
            return;
        }

        // zusaetzliche Zellen einfuegen...
        int newColumns = (currencyList.size() - 1) * 2;
        for (int i = 0; i < newColumns; i++) {
            logger.info(".. add currency column...");
            POIUtil.insertColumn(sheet, 6, 8 + i);
        }

        // Beschriftungen eintragen
        int col = 6;
        XSSFCell cell = null;
        XSSFRow labelRow = sheet.getRow(9);
        for (String currency : currencyList) {

            cell = labelRow.getCell(col);
            cell.setCellValue("Total " + currency);
            col++;

            cell = labelRow.getCell(col);
            cell.setCellValue("Balance " + currency);
            col++;
        }
    }

    /**
     * Hilfsmethode die das fuehrende K/D aus der Debitorennummer entfernt
     * 
     * @return
     */
    private String getDbtNr(ItemCollection workitem) {
        String dbtNr = workitem.getItemValueString("dbtr.number");
        if (dbtNr.startsWith("D") || dbtNr.startsWith("K")) {
            dbtNr = dbtNr.substring(1);
        }
        return dbtNr;
    }

    /**
     * This helper method inserts a row for each invoice at row 16
     * into the excel template file
     * <p>
     * The method copies the Row A16 as a reference row
     * <p>
     * The named cell 'TOTAL' should contain the summary formula. It will be
     * evaluated at the end.
     * 
     * @throws PluginException
     * @throws QueryException
     */
    private void insertInvoiceRows(XSSFSheet sheet, ItemCollection document, List<String> currencyList)
            throws PluginException, QueryException {

        // load dummy rechnungen
        List<ItemCollection> invoices = loadInvoices(getDbtNr(document));

        // load XSSFWorkbook

        CellReference invoiceRefCell = new CellReference("A11");
        XSSFRow referenceRowInvoice = sheet.getRow(invoiceRefCell.getRow());
        int referenceRowPos = 10;
        int rowPos = referenceRowPos;
        int lastRow = 2999;
        logger.finest("Last rownum=" + lastRow);

        // jetzt füge alle Rechnungen an.
        int totalRowCount = invoices.size();
        POIUtil.insertRows(sheet, "A11", totalRowCount - 0);

        for (ItemCollection invoice : invoices) {
            logger.fine("......add invoice " + invoice.getUniqueID());
            // now create a new line..
            XSSFRow row = sheet.createRow(rowPos);
            row.copyRowFrom(referenceRowInvoice, new CellCopyPolicy());
            // insert values
            row.getCell(0)
                    .setCellValue(invoice.getItemValueDate("$created"));
            row.getCell(1, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueString("invoice.number"));
            row.getCell(2, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueDate("invoice.date"));
            row.getCell(3, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueDate("invoice.duedate"));
            row.getCell(4, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueString("space.name"));
            row.getCell(5, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueString("invoice.text"));

            // Waehrung?
            String currency = invoice.getItemValueString("invoice.currency");
            int totalCol = findTotalPos(currency, currencyList);

            row.getCell(totalCol, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueDouble("invoice.total"));
            row.getCell(totalCol + 1, MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueDouble("invoice.saldo"));
            // Status
            row.getCell(6 + (currencyList.size() * 2), MissingCellPolicy.CREATE_NULL_AS_BLANK)
                    .setCellValue(invoice.getItemValueString("$workflowstatus"));

            rowPos++;
        }

        // setze Summen Formeln
        for (int column = 6; column < currencyList.size() * 2 + 6; column++) {
            XSSFCell cell = sheet.getRow(totalRowCount + 11).getCell(column); // G11
            String cellRefFrom = POIUtil.getCellReference(column, 10);
            String cellRefTo = POIUtil.getCellReference(column, totalRowCount + 10);
            String formula = "SUM(" + cellRefFrom + ":" + cellRefTo + ")";
            cell.setCellFormula(formula);
        }

        // Optional: Formel direkt evaluieren
        XSSFFormulaEvaluator.evaluateAllFormulaCells(sheet.getWorkbook());

    }

    /**
     * Findet die Total Spalte für eine Währung
     * 
     * @param currency
     * @return
     */
    private int findTotalPos(String currency, List<String> currencyList) {
        int result = 6;
        if (currency != null) {
            for (String cur : currencyList) {
                if (currency.equals(cur)) {
                    return result;
                }
                result = result + 2;
            }
        }
        return result;
    }

    /**
     * This method loads a text-block for a specified ref and appends the named
     * fileData object of this document.
     * 
     * @param document
     * @throws PluginException
     */
    private FileData appendExcelTemplate(ItemCollection document, String textblockRef, String template,
            String targetName)
            throws PluginException {

        if ((template == null || template.isEmpty()) || (textblockRef == null || textblockRef.isEmpty())) {
            throw new PluginException(AGLAnalyticExcelAdapter.class.getSimpleName(),
                    InvoiceService.ERROR_CONFIG,
                    "invalid SOA configuration in model event - textblock/template reference not defined!");
        }

        // load the text block
        FileData fileData = invoiceService.loadTextBlockFileData(textblockRef, template);

        // do we found the document?
        if (fileData == null) {
            throw new PluginException(AGLAnalyticExcelAdapter.class.getSimpleName(),
                    InvoiceService.ERROR_CONFIG,
                    "invalid SOA configuration in model event - template=" + template
                            + " not found!");
        }
        fileData.setName(targetName);
        // append document
        logger.info("...append new SOA Template: " + targetName);
        document.addFileData(fileData);
        return fileData;
    }

    /**
     * Diese Methode läd alle offenen Steuerbescheide
     * 
     * @return
     */
    private List<ItemCollection> loadInvoices(String dbtrNumber) {
        List<ItemCollection> result = new ArrayList<>();

        String query = "(type:workitem) AND dbtr.number:" + dbtrNumber
                + " AND $modelversion:rechnungsausgang-*";
        try {
            result = documentService.find(
                    query, 9999, 0,
                    "invoice.number", false);
        } catch (QueryException e) {
            e.printStackTrace();
        }
        return result;
    }

}