package com.smartgwt.sample.showcase.client.dataintegration.java.serversummaries;

import java.util.HashMap;
import java.util.Map;

import com.smartgwt.client.data.DSRequest;
import com.smartgwt.client.data.DataSource;
import com.smartgwt.client.types.ListGridFieldType;
import com.smartgwt.client.types.SummaryFunctionType;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.SelectItem;
import com.smartgwt.client.widgets.form.fields.events.ChangedEvent;
import com.smartgwt.client.widgets.form.fields.events.ChangedHandler;
import com.smartgwt.client.widgets.grid.ListGrid;
import com.smartgwt.client.widgets.grid.ListGridField;
import com.smartgwt.client.widgets.grid.ListGridRecord;
import com.smartgwt.client.widgets.layout.VStack;

import com.google.gwt.core.client.EntryPoint;

public class DynamicAggregationSample implements EntryPoint {

@Override
    public void onModuleLoad() {

final ListGrid orderItemList = new ListGrid();
    	orderItemList.setDataSource(DataSource.get("dynamicAggregation_orderItem"));
    	orderItemList.setWidth(500);
    	orderItemList.setHeight(300);
    	orderItemList.setShowFilterEditor(true);
    	orderItemList.setAutoFetchData(false);
    	orderItemList.setCanEdit(false);
    	orderItemList.setCanRemoveRecords(false);
    	
    	ListGridField orderCustomerName = new ListGridField("orderCustomerName");
    	orderCustomerName.setHidden(true);
    	orderCustomerName.setTitle("Customer name");
    	ListGridField itemDescription = new ListGridField("itemDescription");
    	ListGridField unitPrice = new ListGridField("unitPrice");
    	unitPrice.setType(ListGridFieldType.FLOAT);
    	unitPrice.setHidden(true);
    	ListGridField amount = new ListGridField("amount");
    	amount.setType(ListGridFieldType.INTEGER);
    	ListGridField pk = new ListGridField("pk");
    	pk.setTitle("Count");
    	
    	orderItemList.setFields(orderCustomerName,itemDescription,unitPrice,amount,pk);    	
    	
    	DSRequest dsProperties = new DSRequest();
    	Map<String,SummaryFunctionType> summaryFunctions = new HashMap<String,SummaryFunctionType>();
		summaryFunctions.put("pk", SummaryFunctionType.COUNT);
		summaryFunctions.put("amount", SummaryFunctionType.SUM);
		dsProperties.setSummaryFunctions(summaryFunctions);
		dsProperties.setGroupBy("itemDescription");
		orderItemList.fetchData(null, null, dsProperties);
		
        DynamicForm operationForm = new DynamicForm();
        operationForm.setWidth(300);
        
        SelectItem operationId = new SelectItem();
        operationId.setDefaultToFirstOption(true);
        operationId.setTitle("Aggregation");
        
        Map<String,String> valueMap = new HashMap<String,String>();
        valueMap.put("amountByItem", "Amount by item");
        valueMap.put("amountByCustomer", "Amount by customer");
        valueMap.put("minPriceByItem", "Minimum price by item");
        valueMap.put("maxPriceByItem", "Maximum price by item");
        
        operationId.setValueMap(valueMap);
        operationId.addChangedHandler(new ChangedHandler() {
			@Override
			public void onChanged(ChangedEvent event) {
				String value = event.getValue().toString();
				DSRequest requestProperties = new DSRequest();
				orderItemList.setData(new ListGridRecord[0]);
				Map<String,SummaryFunctionType> summaryFunctions = new HashMap<String,SummaryFunctionType>();
				summaryFunctions.put("pk", SummaryFunctionType.COUNT);
				if (value.equals("amountByItem")) {
					summaryFunctions.put("amount", SummaryFunctionType.SUM);
					requestProperties.setGroupBy("itemDescription");
                } else if (value.equals("amountByCustomer")) {
					summaryFunctions.put("amount", SummaryFunctionType.SUM);
					requestProperties.setGroupBy("orderCustomerName");
                } else if (value.equals("minPriceByItem")) {
					summaryFunctions.put("unitPrice", SummaryFunctionType.MIN);
					requestProperties.setGroupBy("itemDescription");
                } else {
					summaryFunctions.put("unitPrice", SummaryFunctionType.MAX);
					requestProperties.setGroupBy("itemDescription");
                }
				requestProperties.setSummaryFunctions(summaryFunctions);
				orderItemList.fetchData(null, null, requestProperties);
				
                if (value.endsWith("ByItem")) {
                    orderItemList.hideField("orderCustomerName");
                    orderItemList.showField("itemDescription");
                } else {
                    orderItemList.showField("orderCustomerName");
                    orderItemList.hideField("itemDescription");
                }
                if (value.startsWith("amount")) {
                    orderItemList.hideField("unitPrice");
                    orderItemList.showField("amount");
                } else {
                    orderItemList.showField("unitPrice");
                    orderItemList.hideField("amount");
                }
			}
        });
        operationForm.setFields(operationId);
        		
        VStack vStack = new VStack();
        vStack.setWidth100();
        vStack.setMembersMargin(10);
        vStack.setMembers(operationForm,orderItemList);
        
        vStack.draw();
    }

}