/*
    * Copyright 2013 smartics, Kronseder & Reiner GmbH
    *
    * 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 de.smartics.properties.admin.resources.representation.html;
  
  import static de.smartics.properties.admin.domain.model.AppRelations.PROPERTY;
  
  import java.io.OutputStream;
  import java.net.URI;
  import java.util.List;
  
  import org.apache.commons.lang.ObjectUtils;
  import org.apache.commons.lang.StringUtils;
  
  import de.smartics.html5.jatl.HtmlResourceContext;
  import de.smartics.properties.admin.domain.model.ConfigurationProperty;
  import de.smartics.properties.admin.domain.model.Paths;
  import de.smartics.properties.admin.domain.model.Roles;
  import de.smartics.properties.admin.resources.controller.ApiResource;
  import de.smartics.properties.admin.resources.controller.PropertyResource;
  import de.smartics.properties.admin.resources.representation.html.share.AbstractHtmlRepresentationRenderer;
  import de.smartics.properties.api.config.domain.DescribedProperty;
  import de.smartics.properties.api.config.domain.ValidatedProperty;
  import de.smartics.properties.api.config.domain.key.ConfigurationKey;
  import de.smartics.properties.api.core.domain.PropertyCategories;
  import de.smartics.properties.api.core.domain.PropertyConstraint;
  import de.smartics.properties.api.core.domain.PropertyDescriptor;
  import de.smartics.properties.spi.core.constraints.PropertyRangeConstraint;
  import de.smartics.resteasy.hypermedia.renderer.LinkDescriptor;
  import de.smartics.util.lang.StringFunction;
  
  /**
   * Displays a single property in an HTML page.
   */
  public final class PropertyHtmlRepresentationRenderer extends
      AbstractHtmlRepresentationRenderer<ConfigurationProperty>
  {
    // ********************************* Fields *********************************
  
    // --- constants ------------------------------------------------------------
  
    /**
     * The class for HTML tables.
     * <p>
     * The value of this constant is {@value}.
     * </p>
     */
    private static final String CSS_CLASS_TABLE =
        "table table-striped table-bordered";
  
    // --- members --------------------------------------------------------------
  
    /**
     * The domain object to render.
     */
    private final ConfigurationProperty domainObject;
  
    // ****************************** Initializer *******************************
  
    // ****************************** Constructors ******************************
  
    /**
     * Default constructor.
     *
     * @param htmlContext the context information to render the representation.
     * @param domainObject the domain object to render.
     * @param entityStream the stream to write to.
     */
    public PropertyHtmlRepresentationRenderer(
        final HtmlResourceContext htmlContext,
        final ConfigurationProperty domainObject, final OutputStream entityStream)
    {
      super(htmlContext, entityStream);
      this.domainObject = domainObject;
    }
  
    // ****************************** Inner Classes *****************************
  
    // ********************************* Methods ********************************
  
    // --- init -----------------------------------------------------------------
  
    // --- get&set --------------------------------------------------------------
  
    @Override
    protected String getTitle()
    {
     final DescribedProperty property = domainObject.getProperty();
     return property.getName();
   }
 
   // --- business -------------------------------------------------------------
 
   @Override
   protected void bodyContents()
   {
     final Object value = domainObject.getPropertyValue();
 
     final String subTitle = ObjectUtils.toString(value, null);
     renderPageTitle(subTitle);
 
     valueInformation();
     descriptorInformation();
   }
 
   private void valueInformation()
   {
     final DescribedProperty property = domainObject.getProperty();
 
     html.h2().text("Value").end();
     html.table().classAttr(CSS_CLASS_TABLE);
     html.tr().th().text("type").end().th().text("value").end().end();
 
     if (property instanceof ValidatedProperty)
     {
       final String resolvedValue =
           ObjectUtils.toString(
               ((ValidatedProperty) property).getValidatedValue(), null);
       final String unresolvedValue = property.getValue();
 
       if (ObjectUtils.equals(unresolvedValue, resolvedValue))
       {
         renderValueFormInRow(property.getName(), property);
       }
       else if (property.getDescriptor().isSecured())
       {
         renderRow("unresolved value", property.getValue());
         renderValueFormInRow(property.getName(), property);
       }
       else
       {
         renderRow("resolved value", resolvedValue);
         renderValueFormInRow("unresolved value", property);
       }
     }
     else
     {
       renderValueFormInRow("unresolved value", property);
     }
     renderRow("Source Configuration", property.getConfigurationKey());
 
     html.end();
   }
 
   private void descriptorInformation()
   {
     final PropertyDescriptor descriptor = domainObject.getDescriptor();
 
     html.h2().text("Descriptor").end();
     html.table().classAttr(CSS_CLASS_TABLE);
     html.tr().th().text("name").end().th().text("value").end().end();
     renderRow("mandatory", descriptor.isMandatory());
     renderRow("access type", descriptor.getAccessType());
     renderRow("use type", descriptor.getUseType().toString());
     renderRow("categories", toString(descriptor.getCategories()));
     renderRow("comment", descriptor.getComment());
     renderRow("configuration time", descriptor.getConfigurationTime());
     renderRow("update interval", descriptor.getUpdateIntervalInMs());
     renderRow("default expression", descriptor.getDefaultExpression());
     renderRow("value type", descriptor.getType());
     renderRow("value range", descriptor.getValueRange());
     renderRow("constraints", toString(descriptor.getConstraints()));
     renderRow("declaring type", descriptor.getDeclaringType().getName());
     renderRow("home page", descriptor.getContext().getHomePageUrl());
     final String reportUrl =
         descriptor.getContext().getPropertiesContext()
             .createReportUrl(descriptor);
     renderRow("Report", reportUrl);
     html.end();
 
     html.p();
     final String propertyKey = descriptor.getKey().toString();
     final String configurationKey = domainObject.getConfigurationKey();
     final URI url = createUrl(configurationKey, propertyKey);
     html.a().id("asXml").rel(PROPERTY).href(url.toString())
         .icon("icon-download-alt").text(" Download as XML").end();
     html.end();
   }
 
   private URI createUrl(final String configurationKey, final String propertyKey)
   {
     final URI url =
         htmlContext.getContext().getUriInfo().getBaseUriBuilder()
             .path(PropertyResource.class, "getAsDotXml")
             .build(new Object[] { configurationKey, propertyKey }, false);
     return url;
   }
 
   private String toString(final PropertyCategories categories)
   {
     final List<Class<?>> types = categories.getCategories();
     final StringBuilder buffer = new StringBuilder(64);
     for (final Class<?> type : types)
     {
       buffer.append(type.getName()).append(' ');
     }
     return StringFunction.chop(buffer).toString();
   }
 
   private Object toString(
       final List<? extends PropertyConstraint<?>> constraints)
   {
     final StringBuilder buffer = new StringBuilder(64);
 
     for (final Object constraint : constraints)
     {
       if (constraint instanceof PropertyRangeConstraint)
       {
         continue;
       }
       buffer.append(' ').append(constraint);
     }
 
     return buffer.toString();
   }
 
   private void renderRow(final String label, final Object value)
   {
     if (isNotBlank(value))
     {
       html.tr();
       html.td().text(label).end().td().text(String.valueOf(value)).end();
       html.end();
     }
   }
 
   private void renderValueFormInRow(final String label,
       final DescribedProperty property)
   {
     final String value =
         (property instanceof ValidatedProperty)
             && property.getDescriptor().isSecured() ? ObjectUtils
             .toString(((ValidatedProperty) property).getValidatedValue())
             : property.getValue();
 
     if (htmlContext.getContext().isUserInRole(Roles.EDIT_PROPERTY))
     {
       html.tr();
       html.td().text(label).end().td();
 
       createForm(property, value);
 
       html.end();
       html.end();
     }
     else
     {
       renderRow(label, value);
     }
   }
 
   private void createForm(final DescribedProperty property, final String value)
   {
     final PropertyDescriptor descriptor = domainObject.getDescriptor();
     final boolean disabled = !descriptor.isRuntimeMutable();
     html.form().classAttr("form-inline").method("POST");
     if (disabled)
     {
       createOverrideButton();
     }
     createInputField(property, value, disabled);
     createSubmitButton(disabled);
 
     if (property.getDescriptor().isSecured())
     {
       final LinkDescriptor link =
           linkDescriptorFactory.createDescriptor(ApiResource.SECURITY,
               "getAsHtml");
       link.setTarget("smartics_properties_security");
       html.link(link);
     }
 
     html.end();
   }
 
   private void createOverrideButton()
   {
     html.button()
         .id("override")
         .type("button")
         .classAttr("btn btn-mini btn-default")
         .onclick(
             "var toggleButton = document.getElementById(\"override\"); "
                 + "document.getElementById(\"submit\").disabled = false; "
                 + "document.getElementById(\"" + Paths.PARAM_VALUE
                 + "\").disabled = false; "
                 + "toggleButton.style.display = 'none';").text("override!")
         .end();
   }
 
   private void createInputField(final DescribedProperty property,
       final String value, final boolean disabled)
   {
     html.input().type("text").id(Paths.PARAM_VALUE).name(Paths.PARAM_VALUE)
         .classAttr("input-xlarge");
     addDisabledStatus(disabled);
     if (isDefinedInThisConfiguration(property))
     {
       html.value(value);
     }
     else
     {
       html.attr("placeholder", value);
     }
     html.end();
   }
 
   private void createSubmitButton(final boolean disabled)
   {
     html.button().type("submit").id("submit")
         .classAttr("btn btn-mini btn-default");
     addDisabledStatus(disabled);
     html.text("update").end();
   }
 
   private boolean isDefinedInThisConfiguration(final DescribedProperty property)
   {
     final ConfigurationKey<?> key = property.getConfigurationKey();
     final String keyString = key != null ? key.toString() : null;
     final boolean isDefined =
         domainObject.getConfigurationKey().equals(keyString);
     return isDefined;
   }
 
   private void addDisabledStatus(final boolean disabled)
   {
     if (disabled)
     {
       html.disabled("disabled");
     }
   }
 
   private boolean isNotBlank(final Object value)
   {
     if (value == null)
     {
       return false;
     }
 
     return StringUtils.isNotBlank(String.valueOf(value));
   }
 
   @Override
   protected List<LinkDescriptor> breadcrumbLinks()
   {
     return breadcrumb.property(domainObject.getConfigurationKey(),
         domainObject.getPropertyKey());
   }
 
   // --- object basics --------------------------------------------------------
 
 }