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package in.shop2020.inventory.service;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.MessageFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.thrift.TException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Font.FontFamily;
import com.itextpdf.text.FontFactory;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;

import in.shop2020.model.v1.catalog.CatalogServiceException;
import in.shop2020.model.v1.inventory.InventoryService;
import in.shop2020.model.v1.inventory.StateInfo;
import in.shop2020.model.v1.inventory.VendorItemMapping;
import in.shop2020.model.v1.order.BuyerInfo;
import in.shop2020.model.v1.order.WarehouseAddress;
import in.shop2020.purchase.PurchaseOrder;
import in.shop2020.purchase.Supplier;
import in.shop2020.purchase.TaxType;
import in.shop2020.thrift.clients.CatalogClient;
import in.shop2020.thrift.clients.InventoryClient;
import in.shop2020.thrift.clients.TransactionClient;

public class PdfPoSheetGenerator {

        private static Logger logger = LoggerFactory.getLogger(PdfPoSheetGenerator.class);

        private static final Font helvetica8 = FontFactory.getFont(FontFactory.HELVETICA, 8);

        private static final Font helveticaBold8 = FontFactory.getFont(FontFactory.HELVETICA_BOLD, 8);
        private static final Font helveticaBold12 = FontFactory.getFont(FontFactory.HELVETICA_BOLD, 12);

        public static Map<Long, StateInfo> stateIdMap = null;
        public static InventoryService.Client inventoryClient = null;

        static String CONTACT_FORMAT = "Mr. {0}, Contact No. +91 {1}";

        static {
                try {
                        inventoryClient = new InventoryClient().getClient();
                        stateIdMap = inventoryClient.getStateMaster();

                } catch (Exception e) {
                        logger.error("Unable to get State Info Map", e);
                }
        }

        public static String generatePdfSheet(PurchaseOrder purchaseOrder, Supplier supplier) throws IOException {
                ByteArrayOutputStream baosPDF = null;
                try {
                        in.shop2020.model.v1.order.TransactionService.Client tClient = new TransactionClient().getClient();
                        BuyerInfo binfo = tClient.getBuyerByWarehouse(purchaseOrder.getWarehouseId());
                        baosPDF = new ByteArrayOutputStream();

                        Document document = new Document();
                        PdfWriter.getInstance(document, baosPDF);
                        document.addAuthor("shop2020");
                        document.addTitle("Purchase Order No: " + purchaseOrder.getPoNumber());
                        document.open();

                        PdfPTable poTable = getPoTable(purchaseOrder, supplier, binfo);
                        poTable.setSpacingAfter(10.0f);
                        poTable.setWidthPercentage(100.0f);

                        document.add(poTable);
                        document.close();
                        baosPDF.close();
                } catch (Exception e) {
                        logger.error("Error while generating Invoice: ", e);
                        e.printStackTrace();
                }

                String tmpDir = System.getProperty("java.io.tmpdir");
                String filename = tmpDir + "/NSSPL-" + purchaseOrder.getId() + ".pdf";
                File f = new File(filename);
                FileOutputStream fos = new FileOutputStream(f);
                baosPDF.writeTo(fos);
                return filename;
        }

        private static PdfPTable getPoTable(PurchaseOrder purchaseOrder, Supplier supplier, BuyerInfo binfo) throws Exception {
                PdfPTable poTable = new PdfPTable(1);
                poTable.getDefaultCell().setBorder(Rectangle.NO_BORDER);
                poTable.getDefaultCell().setHorizontalAlignment(Element.ALIGN_CENTER);

                PdfPCell poTitleCell = new PdfPCell(new Phrase("Purchase Order", helveticaBold12));
                poTitleCell.setHorizontalAlignment(Element.ALIGN_CENTER);
                poTitleCell.setBorder(Rectangle.NO_BORDER);

                long poValidityLimit = supplier.getPoValidityLimit();
                Calendar cal1 = Calendar.getInstance();
                cal1.setTimeInMillis(purchaseOrder.getCreatedAt());
                cal1.add(Calendar.DAY_OF_MONTH, (int) poValidityLimit);
                Date poDate = new Date(purchaseOrder.getCreatedAt());
                Date poExpiryDate = new Date(cal1.getTimeInMillis());

                PdfPTable poSummaryTable = new PdfPTable(new float[] { 0.3f, 0.3f, 0.4f });
                poSummaryTable.addCell(new PdfPCell(new Phrase("PO No: " + purchaseOrder.getPoNumber())));
                poSummaryTable.addCell(new PdfPCell(new Phrase("Date: " + DateFormat.getDateInstance(DateFormat.MEDIUM).format(poDate))));
                poSummaryTable.addCell(new PdfPCell(new Phrase("PO Valid for delivery by: "
                                + DateFormat.getDateInstance(DateFormat.MEDIUM).format(poExpiryDate))));
                poSummaryTable.setSpacingBefore(10.0f);

                poTable.addCell(poTitleCell);
                poTable.addCell(getAddressCell(purchaseOrder, binfo));
                poTable.addCell(poSummaryTable);
                poTable.addCell(getSalutationTable(supplier));
                poTable.addCell(getPoDetailsTable(purchaseOrder, supplier, binfo));
                poTable.addCell(getBillToTable(purchaseOrder));
                // poTable.addCell(getCFormCell(purchaseOrder.getTaxType()));
                
                if(supplier.isSetTnc()) {
                        poTable.addCell(getTncTable(supplier.getTnc()));
                }

                return poTable;
        }

        /*
         * private static PdfPCell getCFormCell(TaxType taxType) { PdfPCell
         * cFormCell = null; if(taxType == TaxType.CFORM) { cFormCell = new
         * PdfPCell(new Paragraph("*To be billed on CST Against C-Form ", new
         * Font(FontFamily.TIMES_ROMAN, 8f))); } else { cFormCell = new PdfPCell();
         * } cFormCell.setBorder(Rectangle.NO_BORDER);
         * cFormCell.setHorizontalAlignment(Element.ALIGN_LEFT); return cFormCell; }
         */

        private static PdfPTable getAddressCell(PurchaseOrder purchaseOrder, BuyerInfo binfo) {
                // TODO Write this code in a proper configurable way
                String address = "";
                String tinNo = "";
                String shippingAddress = "";
                try {
                        in.shop2020.model.v1.order.TransactionService.Client tClient = new TransactionClient().getClient();
                        WarehouseAddress addr = tClient.getWarehouseAddress(purchaseOrder.getWarehouseAddressId());
                        tinNo = binfo.getTin();
                        address = binfo.getOrganisationName() + "\n" + addr.getAddress() + "\n" + "-" + addr.getPin();
                } catch (Exception e) {
                        logger.error("This should not happen", e);
                }

                PdfPTable billToShipToTable = new PdfPTable(2);
                Paragraph addressParagraph = new Paragraph(address, new Font(FontFamily.TIMES_ROMAN, 8f));
                PdfPCell addressCell = new PdfPCell();
                if (purchaseOrder.getWarehouseId() != purchaseOrder.getShippingWarehouseId()) {
                        addressParagraph = new Paragraph("Bill To :\n" + address + "\n\nTIN NO. " + tinNo, new Font(FontFamily.TIMES_ROMAN, 8f));
                }
                addressCell.addElement(addressParagraph);
                // addressCell.setHorizontalAlignment(Element.ALIGN_CENTER);
                addressCell.setBorder(Rectangle.NO_BORDER);

                if (purchaseOrder.getWarehouseId() != purchaseOrder.getShippingWarehouseId()) {
                        try {
                                in.shop2020.model.v1.order.TransactionService.Client tClient = new TransactionClient().getClient();
                                WarehouseAddress addr = tClient.getWarehouseAddress(purchaseOrder.getShippingWarehouseAddressId());
                                address = binfo.getOrganisationName() + "\n" + addr.getAddress() + "\n" + "-" + addr.getPin();
                        } catch (Exception e) {
                                logger.error("This should not happen", e);
                        }
                        PdfPCell billToShipToCell = new PdfPCell();
                        billToShipToCell.setHorizontalAlignment(Element.ALIGN_LEFT);
                        billToShipToCell.setBorder(Rectangle.NO_BORDER);

                        PdfPCell shippingAddressCell = new PdfPCell();
                        shippingAddressCell.addElement(new Paragraph("Ship To :\n" + shippingAddress + "\nTIN NO. " + tinNo, new Font(
                                        FontFamily.TIMES_ROMAN, 8f)));
                        shippingAddressCell.setHorizontalAlignment(Element.ALIGN_LEFT);
                        shippingAddressCell.setBorder(Rectangle.LEFT);
                        billToShipToTable.addCell(addressCell);
                        billToShipToTable.addCell(shippingAddressCell);
                        billToShipToCell.addElement(billToShipToTable);
                        return billToShipToTable;

                }
                billToShipToTable.addCell(addressCell);
                PdfPCell placeHolderCell = new PdfPCell();
                placeHolderCell.setBorder(Rectangle.NO_BORDER);
                billToShipToTable.addCell(placeHolderCell);
                return billToShipToTable;
        }

        private static PdfPTable getSalutationTable(Supplier supplier) throws Exception {
                PdfPTable salutationTable = new PdfPTable(1);
                salutationTable.getDefaultCell().setHorizontalAlignment(Element.ALIGN_LEFT);
                salutationTable.getDefaultCell().setBorder(Rectangle.NO_BORDER);
                salutationTable.addCell(new Phrase("To", helvetica8));
                if (supplier.getName().equals("Smobility Ltd.")) {
                        salutationTable.addCell(new Phrase("Spice Retail Ltd.", helvetica8));
                } else if (supplier.getName().equals("Smobility Ltd. - Mumbai")) {
                        salutationTable.addCell(new Phrase("Spice Retail Ltd. Mumbai", helvetica8));
                } else {
                        salutationTable.addCell(new Phrase(supplier.getName(), helvetica8));
                }

                salutationTable.addCell(new Paragraph(supplier.getCommunicationAddress(), helvetica8));
                salutationTable.addCell(new Phrase("Dear Sir/Madam", helveticaBold8));
                salutationTable.addCell(new Phrase("Please supply the following stocks as per the details given below:", helvetica8));
                salutationTable.addCell(new Phrase(" "));
                return salutationTable;
        }

        private static PdfPTable getPoDetailsTable(PurchaseOrder purchaseOrder, Supplier supplier, BuyerInfo binfo)
                        throws CatalogServiceException, TException {
                float[] widths;
                TaxType taxType = purchaseOrder.getTaxType();
                if(taxType.equals(TaxType.SGST)){
                        widths = new float[] { 0.05f, 0.25f, 0.09f, 0.1f, 0.09f, 0.09f, 0.09f, 0.07f, 0.1f, 0.07f, 0.1f };
                } else {
                        widths = new float[] { 0.1f, 0.27f, 0.1f, 0.1f, 0.1f, 0.1f, 0.1f, 0.08f, 0.1f };
                }
                PdfPTable detailsTable = new PdfPTable(widths);
                
                PdfPCell slNoCell = getHeaderCell("Sl. No");
                detailsTable.addCell(slNoCell);
                
                PdfPCell description = getHeaderCell("Description");
                detailsTable.addCell(description);

                
                PdfPCell hsnCodeCell = getHeaderCell("HSN Code");
                detailsTable.addCell(hsnCodeCell);
                
                PdfPCell qtyCell = getHeaderCell("Qty");
                detailsTable.addCell(qtyCell);

                PdfPCell rateCell = getHeaderCell("Rate");
                detailsTable.addCell(rateCell);
                
                PdfPCell totalCell = getHeaderCell("Total Value");
                detailsTable.addCell(totalCell);
                
                PdfPCell taxableAmontCell = getHeaderCell("Taxable Value");
                taxableAmontCell.setRowspan(2);
                detailsTable.addCell(taxableAmontCell);
                
                
                if(taxType.equals(TaxType.SGST)) {
                        PdfPCell cell1 = new PdfPCell(new Phrase("CGST", helveticaBold8));
                        cell1.setColspan(2);
                        cell1.setHorizontalAlignment(Element.ALIGN_CENTER);
                        detailsTable.addCell(cell1);

                        PdfPCell cell2 = new PdfPCell(new Phrase("SGST", helveticaBold8));
                        cell2.setHorizontalAlignment(Element.ALIGN_CENTER);
                        cell2.setColspan(2);
                        detailsTable.addCell(cell2);
                } else {
                        PdfPCell cell3 = new PdfPCell(new Phrase("IGST", helveticaBold8));
                        cell3.setHorizontalAlignment(Element.ALIGN_CENTER);
                        cell3.setRowspan(2);
                        detailsTable.addCell(cell3);
                }
                
                if(taxType.equals(TaxType.SGST)) {
                        detailsTable.addCell(new Phrase("Rate(%)", helveticaBold8));
                        detailsTable.addCell(new Phrase("Amount", helveticaBold8));
                        detailsTable.addCell(new Phrase("Rate(%)", helveticaBold8));
                        detailsTable.addCell(new Phrase("Amount", helveticaBold8));
                }else {
                        detailsTable.addCell(new Phrase("Rate(%)", helveticaBold8));
                        detailsTable.addCell(new Phrase("Amount", helveticaBold8));
                }
                
                int slNo = 0;
                double total = 0;
                double vatFactor = 0;
                double totalUnits = 0;
                String stateCode = null;
                CatalogClient cClient = new CatalogClient();
                in.shop2020.model.v1.catalog.CatalogService.Client catalogClient = cClient.getClient();
                for (in.shop2020.purchase.LineItem lineitem : purchaseOrder.getLineitems()) {
                        slNo++;
                        detailsTable.addCell(new Phrase(slNo + "", helvetica8));
                        detailsTable.addCell(getProductNameCell(lineitem, purchaseOrder.getSupplierId()));
                        detailsTable.addCell(new Phrase(lineitem.getHsnCode(), helvetica8));
                        detailsTable.addCell(new Phrase(String.format("%d Units", (int)lineitem.getQuantity()), helvetica8));
                        detailsTable.addCell(new Phrase(String.format("%.2f", lineitem.getUnitPrice()), helvetica8));

                        double totalAmount = lineitem.getUnitPrice()*lineitem.getQuantity();
                        detailsTable.addCell(new Phrase(String.format("%.2f", totalAmount), helvetica8));

                        double totalTaxRate = lineitem.getIgstRate() + lineitem.getSgstRate() + lineitem.getCgstRate();
                        double taxableAmount = totalAmount / (1 + (totalTaxRate / 100));
                        detailsTable.addCell(new Phrase(String.format("%.2f", taxableAmount), helvetica8));

                        if(purchaseOrder.getTaxType().equals(TaxType.SGST)) {
                                double cgstAmount = taxableAmount * (lineitem.getCgstRate() / 100);
                                detailsTable.addCell(new Phrase(String.format("%.2f", lineitem.getCgstRate()), helvetica8));
                                detailsTable.addCell(new Phrase(String.format("%.2f", cgstAmount), helvetica8));

                                double sgstAmount = taxableAmount * (lineitem.getSgstRate() / 100);
                                detailsTable.addCell(new Phrase(String.format("%.2f", lineitem.getSgstRate()), helvetica8));
                                detailsTable.addCell(new Phrase(String.format("%.2f", sgstAmount), helvetica8));
                        } else {
                                double igstAmount = taxableAmount * (lineitem.getIgstRate() / 100);
                                detailsTable.addCell(new Phrase(String.format("%.2f", lineitem.getIgstRate()), helvetica8));
                                detailsTable.addCell(new Phrase(String.format("%.2f", igstAmount), helvetica8));
                        }

                        totalUnits += lineitem.getQuantity();
                        total += totalAmount;
                }
                if(purchaseOrder.getTaxType().equals(TaxType.SGST)) {
                        
                        detailsTable.addCell(getTotalCell(3));
                        detailsTable.addCell(new Phrase(String.format("%.0f", totalUnits), helvetica8));
                        detailsTable.addCell(getTotalAmountCell(7, total));
                } else {
                        detailsTable.addCell(getTotalCell(2));
                        detailsTable.addCell(new Phrase(String.format("%.0f", totalUnits), helvetica8));
                        detailsTable.addCell(getTotalAmountCell(6, total));
                }
                return detailsTable;
        }

        private static PdfPCell getHeaderCell(String headerName) {
                PdfPCell cell = new PdfPCell(new Phrase(headerName, helveticaBold8));
                cell.setRowspan(2);
                cell.setHorizontalAlignment(Element.ALIGN_CENTER);
                cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
                return cell;
        }
        private static PdfPTable getTncTable(String tnc) {
                PdfPTable tncTable = new PdfPTable(new float[] { 1f });
                tncTable.addCell(new Phrase("Terms & Conditions", helveticaBold8));
                tncTable.addCell(new Phrase(tnc, helvetica8));
                return tncTable;
        }
        private static PdfPTable getBillToTable(PurchaseOrder po) {
                // TODO Write this code in a proper configurable way
                String address = "";
                String gstin = "";
                String contactPerson = "Neeraj Gupta";
                String contactNumber = "9873802000";
                BuyerInfo binfo = new BuyerInfo();
                try {
                        in.shop2020.model.v1.order.TransactionService.Client tClient = new TransactionClient().getClient();
                        binfo = tClient.getBuyerByWarehouse(po.getWarehouseId());
                        gstin = binfo.getGstin();
                        WarehouseAddress addr = tClient.getWarehouseAddress(po.getWarehouseAddressId());
                        address = binfo.getOrganisationName() + "\n" + addr.getAddress() + "\n" + "-" + addr.getPin();
                        if (StringUtils.isNotBlank(addr.getContact_person())) {
                                contactPerson = addr.getContact_person();
                        }
                        if (StringUtils.isNotBlank(addr.getContact_number())) {
                                contactNumber = addr.getContact_number();
                        }
                } catch (Exception e) {
                        logger.error("This should not happen", e);
                }

                contactPerson = MessageFormat.format(CONTACT_FORMAT, contactPerson, contactNumber);
                PdfPTable billToTable = new PdfPTable(new float[] { 0.2f, 0.8f });
                billToTable.getDefaultCell().setHorizontalAlignment(Element.ALIGN_LEFT);

                billToTable.addCell(new Phrase("Bill To :", helvetica8));
                billToTable.addCell(new PdfPCell(new Paragraph(address 
                                + "\n\nPlace of Supply - " 
                                + MessageFormat.format("{0}({1})", stateIdMap.get(binfo.getStateId()).getStateName(),stateIdMap.get(binfo.getStateId()).getStateCode())
                                + "\nGST NO. " + gstin, helvetica8)));

                billToTable.addCell(new Phrase("Contact Person:", helvetica8));
                billToTable.addCell(new Phrase(contactPerson, helvetica8));

                billToTable.addCell(new Phrase("Taxes:", helvetica8));
                if (po.getTaxType() == TaxType.CFORM) {
                        billToTable.addCell(new Phrase("Prices inclusive of all taxes (To be billed on CST Against C-Form)", helvetica8));
                } else {
                        billToTable.addCell(new Phrase("Prices inclusive of all taxes", helvetica8));
                }

                return billToTable;
        }

        private static PdfPCell getProductNameCell(in.shop2020.purchase.LineItem lineitem, long supplierId) {
                String itemName = getItemDisplayName(lineitem, supplierId);
                PdfPCell productNameCell = new PdfPCell(new Phrase(itemName, helvetica8));
                productNameCell.setHorizontalAlignment(Element.ALIGN_LEFT);
                return productNameCell;
        }

        private static String getItemDisplayName(in.shop2020.purchase.LineItem lineitem, long supplierId) {
                StringBuffer itemName = new StringBuffer();
                if (lineitem.getBrand() != null)
                        itemName.append(lineitem.getBrand() + " ");
                if (lineitem.getModelName() != null)
                        itemName.append(lineitem.getModelName() + " ");
                if (lineitem.getModelNumber() != null)
                        itemName.append(lineitem.getModelNumber() + " ");
                if (lineitem.getColor() != null && !lineitem.getColor().trim().equals("NA"))
                        itemName.append("-" + lineitem.getColor());
                if(lineitem.getBrand()=="Samsung") {
                        List<VendorItemMapping> vims = getVendorItemMapping(lineitem.getItemId());
                        if(vims != null && vims.size() > 0) {
                                for(VendorItemMapping vim : vims) {
                                        if(vim.getVendorId() == supplierId) {
                                                itemName.append("(" + vim.getItemKey() + ")");
                                        }
                                }
                        }
                }
                return itemName.toString();
        }
        
        private static List<VendorItemMapping> getVendorItemMapping(long itemId) {
                try {
                        
                        return inventoryClient.getVendorItemMappings(itemId);
                }catch (Exception e) {
                        try {
                                inventoryClient =  new InventoryClient().getClient();
                                return inventoryClient.getVendorItemMappings(itemId);
                        } catch(Exception e1) {
                                e1.printStackTrace();
                        }
                }
                return null;
        }

        private static PdfPCell getTotalCell(int colspan) {
                PdfPCell totalCell = new PdfPCell(new Phrase("Total", helveticaBold8));
                totalCell.setColspan(colspan);
                totalCell.setHorizontalAlignment(Element.ALIGN_RIGHT);
                return totalCell;
        }

        private static PdfPCell getTotalAmountCell(int colspan, double totalAmount) {
                PdfPCell totalCell = new PdfPCell(new Phrase(String.format("%.2f", totalAmount), helvetica8));
                totalCell.setColspan(colspan);
                totalCell.setHorizontalAlignment(Element.ALIGN_RIGHT);
                return totalCell;
        }

}