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package in.shop2020.support.services;

import in.shop2020.model.v1.catalog.CatalogServiceException;
import in.shop2020.model.v1.catalog.Item;
import in.shop2020.model.v1.order.LineItem;
import in.shop2020.model.v1.order.Order;
import in.shop2020.model.v1.order.Transaction;
import in.shop2020.model.v1.order.TransactionServiceException;
import in.shop2020.model.v1.user.Address;
import in.shop2020.model.v1.user.Cart;
import in.shop2020.model.v1.user.Line;
import in.shop2020.model.v1.user.ShoppingCartException;
import in.shop2020.model.v1.user.User;
import in.shop2020.model.v1.user.UserContextException;
import in.shop2020.model.v1.user.UserType;
import in.shop2020.thrift.clients.CatalogClient;
import in.shop2020.thrift.clients.TransactionClient;
import in.shop2020.thrift.clients.UserClient;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.thrift.TException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AnalysisDataGenerator {
    
    private static Logger logger = LoggerFactory.getLogger(AnalysisDataGenerator.class);
    
    UserClient usc;
    in.shop2020.model.v1.user.UserContextService.Client uClient;

    CatalogClient csc;
    in.shop2020.model.v1.catalog.CatalogService.Client cClient;

    TransactionClient tsc;
    in.shop2020.model.v1.order.TransactionService.Client tClient;

    public AnalysisDataGenerator() {
        try {
            usc = new UserClient();
            uClient = usc.getClient();

            csc = new CatalogClient();
            cClient = csc.getClient();

            tsc = new TransactionClient();
            tClient = tsc.getClient();
        } catch (Exception e) {
            logger.error("Unable to initialize connection with one of user, catalog or txn client", e);
        }
    }

    public ByteArrayOutputStream generateAnalysisReport(long startDate, long endDate) throws ShoppingCartException {
        List<User> users = null;
        try {
            users = uClient.getAllUsers(UserType.USER, startDate, endDate);
        } catch (TException e) {
            logger.error("Unable to get all users", e);
        }
        if (users == null || users.isEmpty()) {
            return null;
        }
        // Preparing XLS file for output
        return getSpreadSheetData(users);
    }

    // Prepares the XLS worksheet object and fills in the data with proper
    // formatting
    private ByteArrayOutputStream getSpreadSheetData(List<User> users) {
        ByteArrayOutputStream baosXLS = new ByteArrayOutputStream();

        Workbook wb = new HSSFWorkbook();

        Font font = wb.createFont();
        font.setBoldweight(Font.BOLDWEIGHT_BOLD);
        CellStyle style = wb.createCellStyle();
        style.setFont(font);

        CellStyle styleWT = wb.createCellStyle();
        styleWT.setWrapText(true);
        styleWT.setFillBackgroundColor((short)1);

        CellStyle styleUser = wb.createCellStyle();
        styleUser.setFillBackgroundColor(HSSFColor.LIGHT_BLUE.index);
        
        CellStyle styleItem = wb.createCellStyle();
        styleItem.setFillBackgroundColor(HSSFColor.LIGHT_ORANGE.index);
        
        CellStyle styleOrder = wb.createCellStyle();
        styleOrder.setFillBackgroundColor(HSSFFont.COLOR_RED);
        styleOrder.setHidden(true);
        
        Sheet analysisSheet = wb.createSheet("User");
        short rowNo = 0;

        Row titleRow = analysisSheet.createRow(rowNo++);
        Cell titleCell = titleRow.createCell(0);
        titleCell.setCellValue("User Details");
        titleCell.setCellStyle(style);

        analysisSheet.addMergedRegion(new CellRangeAddress(0, 0, 0, 6));

        Row headerRow = analysisSheet.createRow(rowNo++);
        headerRow.createCell(0).setCellValue("S.No.");
        headerRow.createCell(1).setCellValue("User Id");
        headerRow.createCell(2).setCellValue("Email");
        headerRow.createCell(3).setCellValue("Name");
        headerRow.createCell(4).setCellValue("Communication Email");
        headerRow.createCell(5).setCellValue("Date of Birth");
        headerRow.createCell(6).setCellValue("Sex");
        headerRow.createCell(7).setCellValue("Mobile");
        headerRow.createCell(8).setCellValue("Registered On");
        headerRow.createCell(9).setCellValue("Last Login");

        headerRow.createCell(10).setCellValue("Cart Id");
        headerRow.createCell(11).setCellValue("Cart/Default Address");

        headerRow.createCell(12).setCellValue("Item Id");
        headerRow.createCell(13).setCellValue("Brand");
        headerRow.createCell(14).setCellValue("Model Name");
        headerRow.createCell(15).setCellValue("Model Number");

        headerRow.createCell(16).setCellValue("Order Id");
        headerRow.createCell(17).setCellValue("Order Status");
        headerRow.createCell(18).setCellValue("Status Description");
        headerRow.createCell(19).setCellValue("Order Amount");
        headerRow.createCell(20).setCellValue("Item Brand");
        headerRow.createCell(21).setCellValue("Model Name");
        headerRow.createCell(22).setCellValue("Model Number");

        Calendar calendar = Calendar.getInstance();
        Row contentRow;
        float defaultRowHeight = analysisSheet.getDefaultRowHeightInPoints();
        DateFormat formatter = new SimpleDateFormat("EEE, dd-MMM-yyyy hh:mm a");
        int sNo = 0;
        int addrCol = 11, itemOffset = addrCol + 1, orderOffset = itemOffset + 4;
        for (User u : users) {
            rowNo++;
            sNo++;
            contentRow = analysisSheet.createRow(rowNo);
            contentRow.createCell(0).setCellValue(sNo);
            contentRow.createCell(1).setCellValue(u.getUserId());
            contentRow.createCell(2).setCellValue(u.getEmail());
            contentRow.createCell(3).setCellValue(u.getName());
            contentRow.createCell(4).setCellValue(u.getCommunicationEmail());
            contentRow.createCell(5).setCellValue(u.getDateOfBirth());
            // calendar.setTimeInMillis
            contentRow.createCell(6).setCellValue(u.getSex().name());
            contentRow.createCell(7).setCellValue(u.getMobileNumber());
            calendar.setTimeInMillis(u.getActiveSince());
            contentRow.createCell(8).setCellValue(formatter.format(calendar.getTime()));
            calendar.setTimeInMillis(u.getLastLogin());
            contentRow.createCell(9).setCellValue(formatter.format(calendar.getTime()));
            
            Cart cart = null;
            try {
                System.out.println("User Id : " + u.getUserId());
                cart = uClient.getCurrentCart(u.getUserId());
            } catch (TException e) {
                logger.error("Error while getting the cart of the user:" + u.getUserId(), e);
            } catch (ShoppingCartException e) {
                logger.error("Unable to get the cart for the user:" + u.getUserId());
            }
            contentRow.createCell(10).setCellValue((cart != null) ? cart.getId() + "" : "");
            for(int i = 0; i <= addrCol - 1; i++) {
                contentRow.getCell(i).setCellStyle(styleUser);
            }
            List<Address> addresses = u.getAddresses();
            int len, addrColWidth = 40;
            analysisSheet.setColumnWidth(addrCol, addrColWidth * 256); /* set width of address column to 40 characters */
            String addressString = getAddress(addresses, u.getDefaultAddressId(), (cart != null ? cart.getAddressId() : 0));
            contentRow.createCell(addrCol).setCellValue(addressString);
            contentRow.getCell(addrCol).setCellStyle(styleWT);
            len = addressString.length();
            if (len > 40) {
                contentRow.setHeightInPoints((len / addrColWidth + 1) * defaultRowHeight); /* Setting Row Height */
            }
            
            if (cart != null) {
                List<Line> lines = cart.getLines();
                if (lines != null && !lines.isEmpty()) {
                    Item catalogItem;
                    for (Line line : lines) {
                        try {
                            catalogItem = cClient.getItem(line.getItemId());
                            if (catalogItem == null) {
                                continue;
                            }
                            rowNo++;
                            contentRow = analysisSheet.createRow(rowNo);
                            contentRow.createCell(itemOffset + 0).setCellValue(catalogItem.getId());
                            contentRow.createCell(itemOffset + 1).setCellValue(catalogItem.getBrand());
                            contentRow.createCell(itemOffset + 2).setCellValue(catalogItem.getModelName());
                            contentRow.createCell(itemOffset + 3).setCellValue(catalogItem.getModelNumber());
                            // linesCount++;
                            // rowNo++;
                        } catch (CatalogServiceException e) {
                            logger.error("Unable to get the item:" + line.getItemId(), e);
                        } catch (TException e) {
                            logger.error("Error while getting the item:" + line.getItemId(), e);
                        }
                        for(int i = itemOffset; i < orderOffset; i++) {
                            contentRow.getCell(i).setCellStyle(styleItem);
                        }
                    }
                }

                List<Transaction> transactions;
                try {
                    transactions = tClient.getTransactionsForShoppingCartId(cart.getId());
                    if (transactions != null && !transactions.isEmpty()) {
                        List<Order> orders;
                        // int ordersRowNo = rowNo - linesCount;
                        for (Transaction txn : transactions) {
                            orders = txn.getOrders();
                            if (orders == null || orders.isEmpty()) {
                                continue;
                            }
                            LineItem lineItem;
                            for (Order o : orders) {
                                lineItem = o.getLineitems().get(0);
                                rowNo++;
                                contentRow = analysisSheet.createRow(rowNo);
                                contentRow.createCell(orderOffset + 0).setCellValue(o.getId());
                                contentRow.createCell(orderOffset + 1).setCellValue(o.getStatus().name());
                                contentRow.createCell(orderOffset + 2).setCellValue(o.getStatusDescription());
                                contentRow.createCell(orderOffset + 3).setCellValue(o.getTotal_amount());
                                contentRow.createCell(orderOffset + 4).setCellValue(lineItem.getBrand());
                                contentRow.createCell(orderOffset + 5).setCellValue(lineItem.getModel_name());
                                contentRow.createCell(orderOffset + 6).setCellValue(lineItem.getModel_number());
                                for(int i = orderOffset; i < orderOffset + 6; i++) {
                                    contentRow.getCell(i).setCellStyle(styleOrder);
                                }
                            }
                        }
                    }
                } catch (TransactionServiceException e) {
                    logger.error("Unable to get the details of the orders", e);
                } catch (TException e) {
                    logger.error("Error while getting the details of the orders", e);
                }
            }
        }

        for (int i = 0; i <= 22; i++) {
            if (i == addrCol) {
                continue;
            }
            analysisSheet.autoSizeColumn(i);
        }

        // Write the workbook to the output stream
        try {
            wb.write(baosXLS);
            baosXLS.close();
        } catch (IOException e) {
            logger.error("Erro while writing to the byte array", e);
        }
        return baosXLS;
    }

    private String getAddress(List<Address> addresses, long defaultAddrId, long cartAddrId) {
        String addressString = null;
        if (addresses == null || addresses.isEmpty()) {
            return "";
        }
        for (Address a : addresses) {
            if (a.getId() == cartAddrId) {
                addressString = generateAddressString(a);
                break;
            }
        }
        if (addressString == null) {
            for (Address a : addresses) {
                if (a.getId() == defaultAddrId) {
                    addressString = generateAddressString(a);
                    break;
                }
            }
        }
        return addressString == null ? "" : addressString;
    }

    private String generateAddressString(Address a) {
        String addrStr = "";
        addrStr += "Name: " + getStringValue(a.getName());
        addrStr += "; Address: " + getStringValue(a.getLine1());
        addrStr += ", " + getStringValue(a.getLine2());
        addrStr += "; City: " + getStringValue(a.getCity());
        addrStr += "; State: " + getStringValue(a.getState());
        addrStr += "; Pin: " + getStringValue(a.getPin());
        addrStr += "; Phone: " + getStringValue(a.getPhone());
        return addrStr;
    }

    private String getStringValue(String str) {
        return str == null ? "" : str.trim();
    }

    public static void main(String[] args) throws ShoppingCartException {
        DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
        Date startDate = null, endDate = null;
        try {
            startDate = df.parse("05/07/2011");
            endDate = df.parse("05/09/2011");
        } catch (ParseException pe) {
            logger.error("Error while parsing date", pe);
        }
        AnalysisDataGenerator adg = new AnalysisDataGenerator();
        try {
            String userHome = System.getProperty("user.home");
            FileOutputStream f = new FileOutputStream(userHome + "/analysis-data.xls");
            ByteArrayOutputStream baosXLS = adg.generateAnalysisReport(startDate.getTime(), endDate.getTime());
            if (baosXLS == null) {
                System.out.println("No data");
                return;
            }
            baosXLS.writeTo(f);
            f.close();
        } catch (FileNotFoundException e) {
            logger.error("Unable to create file", e);
        } catch (IOException e) {
            logger.error("Error while creating the analysis report", e);
        }
        System.out.println("Successfully generated the analysis report");
    }
}