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package in.shop2020.catalog.dashboard.shared;
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import in.shop2020.catalog.dashboard.client.CatalogService;
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import in.shop2020.catalog.dashboard.client.CatalogServiceAsync;
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import java.util.Date;
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import java.util.Map;
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import java.util.Map.Entry;
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import com.google.gwt.core.client.GWT;
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import com.google.gwt.user.client.Window;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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/**
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 * Utility methods goes here
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 *
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 */
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public class Utils {
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    // item status values. These should be analogous to status enum in status.java
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    // These values are used in the client side to check if transition from one status to another is
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    // valid. Also see validateStatusChange method
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    // FIXME: These should be read from the ThriftConfig file and not hard-coded here.
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    public static final int PHASED_OUT = 0,
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                            DELETED = 1,
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                            PAUSED = 2,
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                            ACTIVE = 3,
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                            IN_PROCESS = 4,
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                            CONTENT_COMPLETE = 5;
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    // role column in helper.catalogdashboarduser table. role specifies
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    // the username-pwd pair for staging or for production.
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    // production password is needed while updating item on production server.
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    public static final int ROLE_STAGING = 0, ROLE_PRODUCTION = 1;
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    private static Map<Long, String> vendors, warehouses;
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    private static final CatalogServiceAsync catalogService = GWT.create(CatalogService.class);
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    static {
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        catalogService.getAllVendors(new AsyncCallback<Map<Long,String>>() {
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            @Override
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            public void onSuccess(Map<Long, String> result) {
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                vendors = result;
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            }
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            @Override
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            public void onFailure(Throwable caught) {
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                caught.printStackTrace();
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            }
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        });
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        catalogService.getAllWarehouses(new AsyncCallback<Map<Long,String>>() {
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            @Override
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            public void onSuccess(Map<Long, String> result) {
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                warehouses = result;
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            }
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            @Override
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            public void onFailure(Throwable caught) {
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                caught.printStackTrace();
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            }
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        });
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    }
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    public static Map<Long, String> getAllVendors() {
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        return vendors;
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    }
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    public static Map<Long, String> getAllWarehouses() {
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        return warehouses;
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    }
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    public static String getVendorDesc(long id) {
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        if(vendors == null) {
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            return null;
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        }
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        return vendors.get(id);
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    }
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    public static String getWarehouseDesc(long id) {
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        if(warehouses == null) {
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            return null;
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        }
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        return warehouses.get(id);
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    }
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    public static String getDisplayableDate(Long millis){
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        Date date = new Date();
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        date.setTime(millis);
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        String dateString = date.toString();
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        dateString = dateString.substring(0, dateString.lastIndexOf(" "));
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        dateString = dateString.substring(0, dateString.lastIndexOf(" "));
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        return dateString;
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    }
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    /**
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     * Since in vendor combo box, vendor name is populated, this method is used to get Id from name
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     * @param vendor name
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     * @return vendor Id corresponding to the name
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     */
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    public static long getVendorId(String vendorDesc) {
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        if(vendors == null) {
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            return 0;
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        }
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        for(Entry<Long, String> v : vendors.entrySet()) {
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            if(v.getValue().equals(vendorDesc)) {
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                return v.getKey();
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            }
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        }
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        return 0;
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    }
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    /**
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     * validates item object. ProductGroup, brand, modelNumber, modelName should not be empty or null.
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     * Also does item and vendor prices validations (MRP >= SP, MRP >= MOP, TP <= MOP)
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     * Vendor Item Key should not be empty or null
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     * @param item
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     * @return true if validation is successful, false otherwise
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     */
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    public static boolean validateItem(Item item) {
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        if(item.getProductGroup() == null || item.getProductGroup().isEmpty()) {
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            Window.alert("Product Group cannot be empty.");
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            return false;
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        }
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        if(item.getBrand() == null || item.getBrand().isEmpty()) {
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            Window.alert("Brand cannot be empty.");
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            return false;
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        }
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        if(item.getModelNumber() == null || item.getModelNumber().isEmpty()) {
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            Window.alert("Model Number cannot be empty.");
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            return false;
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        }
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        if(item.getSellingPrice() != null && item.getMrp() != null && item.getSellingPrice() > item.getMrp()) {
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            Window.alert("Selling price cannot be more than MRP");
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            return false;
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        }
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        if(item.getVendorPricesMap() != null && !item.getVendorPricesMap().isEmpty()) {
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            for(VendorPricings v : item.getVendorPricesMap().values()) {
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                if(item.getMrp() != null && item.getMrp() < v.getMop()) {
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                    Window.alert("MRP cannot be less than MOP. Vendor: " + Utils.getVendorDesc(v.getVendorId()));
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                    return false;
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                }
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                if(v.getTransferPrice() > v.getMop()) {
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                    Window.alert("Transfer Price cannot be more than MOP. Vendor: " + Utils.getVendorDesc(v.getVendorId()));
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                    return false;
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                }
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            }
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        }
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        if(item.getVendorKeysMap() != null && !item.getVendorKeysMap().isEmpty()) {
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            for(VendorItemMapping v : item.getVendorKeysMap().values()) {
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                if(v.getItemKey() == null || v.getItemKey().isEmpty()) {
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                    Window.alert("Item Key cannot be empty. Vendor: " + Utils.getVendorDesc(v.getVendorId()));
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                    return false;
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                }
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            }
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        }
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        return true;
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    }
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    public static boolean validateStatusChange(int fromStatus, int toStatus) {
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        switch(toStatus) {
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        case PHASED_OUT:
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            switch(fromStatus) {
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            case IN_PROCESS: return true;
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            case CONTENT_COMPLETE: return true;
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            case ACTIVE: return true;
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            default: return false;
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            }
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        case IN_PROCESS:
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            switch(fromStatus) {
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            case PHASED_OUT: return true;
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            default: return false;
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            }
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        case PAUSED:
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            switch(fromStatus) {
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            case ACTIVE: return true;
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            default: return false;
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            }
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        case ACTIVE:
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            switch(fromStatus) {
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            case PAUSED: return true;
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            default: return false;
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            }
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        }
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        return true;
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    }
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}