/**
 * Copyright 2015 ArcBees Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.arcbees.gaestudio.client.application.profiler.widget.filter;

import java.util.Map;

import com.arcbees.gaestudio.client.resources.AppResources;
import com.google.gwt.event.logical.shared.SelectionEvent;
import com.google.gwt.event.logical.shared.SelectionHandler;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.Tree;
import com.google.gwt.user.client.ui.TreeItem;
import com.google.gwt.user.client.ui.Widget;
import com.google.inject.Inject;
import com.gwtplatform.mvp.client.ViewWithUiHandlers;

public class MethodFilterView extends ViewWithUiHandlers<MethodFilterUiHandlers>
        implements MethodFilterPresenter.MyView {
    interface Binder extends UiBinder<Widget, MethodFilterView> {
    }

    interface TreeItemTemplate extends SafeHtmlTemplates {
        @SafeHtmlTemplates.Template("<div class=\"{1}\">{0}</div>")
        SafeHtml methodOrClass(String className, String style);
    }

    @UiField
    Tree methods;
    @UiField(provided = true)
    AppResources resources;

    private final TreeItemTemplate template;

    @Inject
    MethodFilterView(
            Binder uiBinder,
            AppResources resources,
            TreeItemTemplate template) {
        this.resources = resources;
        this.template = template;

        initWidget(uiBinder.createAndBindUi(this));

        methods.addSelectionHandler(new SelectionHandler<TreeItem>() {
            @Override
            public void onSelection(SelectionEvent<TreeItem> event) {
                TreeItem selectedItem = event.getSelectedItem();

                if (isLeaf(selectedItem)) {
                    String className = getClassName(selectedItem);
                    String methodName = selectedItem.getText();

                    getUiHandlers().onMethodClicked(className, methodName);
                }
            }
        });
    }

    @Override
    public void display(Map<String, Map<String, FilterValue<String>>> statementsByMethodAndClass) {
        methods.clear();

        for (Map.Entry<String, Map<String, FilterValue<String>>> classFilter : statementsByMethodAndClass.entrySet()) {
            SafeHtml html = template.methodOrClass(classFilter.getKey(), resources.styles().className());
            TreeItem classTreeItem = new TreeItem(html);

            for (String methodName : classFilter.getValue().keySet()) {
                html = template.methodOrClass(methodName, resources.styles().methodName());
                TreeItem methodTreeItem = new TreeItem(html);
                classTreeItem.addItem(methodTreeItem);
            }

            methods.addItem(classTreeItem);
        }
    }

    private boolean isLeaf(TreeItem treeItem) {
        return treeItem.getParentItem() != null;
    }

    private String getClassName(TreeItem treeItem) {
        TreeItem parentItem = treeItem.getParentItem();

        return parentItem.getText();
    }
}