/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.juneau.html;

import static org.apache.juneau.collections.JsonMap.*;

import java.io.*;
import java.lang.reflect.*;
import java.nio.charset.*;
import java.util.*;
import java.util.function.*;

import org.apache.juneau.*;
import org.apache.juneau.collections.*;
import org.apache.juneau.httppart.*;
import org.apache.juneau.internal.*;
import org.apache.juneau.serializer.*;
import org.apache.juneau.svl.*;

/**
 * Context object that lives for the duration of a single serialization of {@link HtmlSerializer} and its subclasses.
 *
 * <p>
 * See {@link Serializer} for details.
 *
 * <h5 class='section'>Notes:</h5><ul>
 *    <li class='warn'>This class is not thread safe and is typically discarded after one use.
 * </ul>
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/HtmlBasics">HTML Basics</a>

 * </ul>
 */
public class HtmlDocSerializerSession extends HtmlStrippedDocSerializerSession {

   //-----------------------------------------------------------------------------------------------------------------
   // Static
   //-----------------------------------------------------------------------------------------------------------------

   private static final VarResolver DEFAULT_VR = VarResolver.create().defaultVars().vars(HtmlWidgetVar.class).build();

   /**
    * Creates a new builder for this object.
    *
    * @param ctx The context creating this session.
    * @return A new builder.
    */
   public static Builder create(HtmlDocSerializer ctx) {
      return new Builder(ctx);
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Builder
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Builder class.
    */
   public static class Builder extends HtmlStrippedDocSerializerSession.Builder {

      HtmlDocSerializer ctx;

      /**
       * Constructor
       *
       * @param ctx The context creating this session.
       */
      protected Builder(HtmlDocSerializer ctx) {
         super(ctx);
         this.ctx = ctx;
      }

      @Override
      public HtmlDocSerializerSession build() {
         return new HtmlDocSerializerSession(this);
      }
      @Override /* Overridden from Builder */
      public <T> Builder apply(Class<T> type, Consumer<T> apply) {
         super.apply(type, apply);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder debug(Boolean value) {
         super.debug(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder properties(Map<String,Object> value) {
         super.properties(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder property(String key, Object value) {
         super.property(key, value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder unmodifiable() {
         super.unmodifiable();
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder locale(Locale value) {
         super.locale(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder localeDefault(Locale value) {
         super.localeDefault(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder mediaType(MediaType value) {
         super.mediaType(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder mediaTypeDefault(MediaType value) {
         super.mediaTypeDefault(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder timeZone(TimeZone value) {
         super.timeZone(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder timeZoneDefault(TimeZone value) {
         super.timeZoneDefault(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder javaMethod(Method value) {
         super.javaMethod(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder resolver(VarResolverSession value) {
         super.resolver(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder schema(HttpPartSchema value) {
         super.schema(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder schemaDefault(HttpPartSchema value) {
         super.schemaDefault(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder uriContext(UriContext value) {
         super.uriContext(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder fileCharset(Charset value) {
         super.fileCharset(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder streamCharset(Charset value) {
         super.streamCharset(value);
         return this;
      }

      @Override /* Overridden from Builder */
      public Builder useWhitespace(Boolean value) {
         super.useWhitespace(value);
         return this;
      }
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Instance
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Constructor.
    *
    * @param builder The builder for this object.
    */
   protected HtmlDocSerializerSession(Builder builder) {
      super(builder);
      ctx = builder.ctx;
      addVarBean(HtmlWidgetMap.class, ctx.getWidgets());
   }

   private final HtmlDocSerializer ctx;

   @Override /* SerializerSession */
   protected VarResolverSession createDefaultVarResolverSession() {
      return DEFAULT_VR.createSession();
   }

   /**
    * Returns the {@link HtmlDocSerializer.Builder#navlinks(String...)} setting value in this context.
    *
    * @return
    *    The {@link HtmlDocSerializer.Builder#navlinks(String...)} setting value in this context.
    *    <jk>null</jk> if not specified.
    *    Never an empty map.
    */
   public final String[] getNavLinks() {
      return ctx.navlinks;
   }

   @Override /* Serializer */
   protected void doSerialize(SerializerPipe out, Object o) throws IOException, SerializeException {

      try (HtmlWriter w = getHtmlWriter(out)) {
         try {
            getTemplate().writeTo(this, w, o);
         } catch (Exception e) {
            throw new SerializeException(e);
         }
      }
   }

   /**
    * Calls the parent {@link #doSerialize(SerializerPipe, Object)} method which invokes just the HTML serializer.
    *
    * @param out
    *    Where to send the output from the serializer.
    * @param o The object being serialized.
    * @throws Exception Error occurred during serialization.
    */
   public void parentSerialize(Object out, Object o) throws Exception {
      try (SerializerPipe pipe = createPipe(out)) {
         super.doSerialize(pipe, o);
      }
   }
   //-----------------------------------------------------------------------------------------------------------------
   // Properties
   //-----------------------------------------------------------------------------------------------------------------

   /**
    * Aside section contents.
    *
    * @see HtmlDocSerializer.Builder#aside(String...)
    * @return
    *    The overridden contents of the aside section on the HTML page.
    */
   protected final String[] getAside() {
      return ctx.aside;
   }

   /**
    * Aside section contents float.
    *
    * @see HtmlDocSerializer.Builder#asideFloat(AsideFloat)
    * @return
    *    The location of where to place the aside section.
    */
   protected final AsideFloat getAsideFloat() {
      return ctx.asideFloat;
   }

   /**
    * Footer section contents.
    *
    * @see HtmlDocSerializer.Builder#footer(String...)
    * @return
    *    The overridden contents of the footer section on the HTML page.
    */
   protected final String[] getFooter() {
      return ctx.footer;
   }

   /**
    * Additional head section content.
    *
    * @see HtmlDocSerializer.Builder#head(String...)
    * @return
    *    HTML content to add to the head section of the HTML page.
    */
   protected final String[] getHead() {
      return ctx.head;
   }

   /**
    * Header section contents.
    *
    * @see HtmlDocSerializer.Builder#header(String...)
    * @return
    *    The overridden contents of the header section on the HTML page.
    */
   protected final String[] getHeader() {
      return ctx.header;
   }

   /**
    * Nav section contents.
    *
    * @see HtmlDocSerializer.Builder#nav(String...)
    * @return
    *    The overridden contents of the nav section on the HTML page.
    */
   protected final String[] getNav() {
      return ctx.nav;
   }

   /**
    * Page navigation links.
    *
    * @see HtmlDocSerializer.Builder#navlinks(String...)
    * @return
    *    Navigation links to add to the HTML page.
    */
   protected final String[] getNavlinks() {
      return ctx.navlinks;
   }

   /**
    * No-results message.
    *
    * @see HtmlDocSerializer.Builder#noResultsMessage(String)
    * @return
    *    The message used when serializing an empty array or empty list.
    */
   protected final String getNoResultsMessage() {
      return ctx.getNoResultsMessage();
   }

   /**
    * Prevent word wrap on page.
    *
    * @see HtmlDocSerializer.Builder#nowrap()
    * @return
    *    <jk>true</jk> if <js>"* {white-space:nowrap}"</js> should be added to the CSS instructions on the page to prevent word wrapping.
    */
   protected final boolean isNowrap() {
      return ctx.nowrap;
   }

   /**
    * Resolve $ variables in serialized POJO.
    *
    * @see HtmlDocSerializer.Builder#resolveBodyVars()
    * @return
    *    <jk>true</jk> if $ variables in serialized POJO should be resolved.
    */
   protected final boolean isResolveBodyVars() {
      return ctx.resolveBodyVars;
   }

   /**
    * Javascript code.
    *
    * @see HtmlDocSerializer.Builder#script(String...)
    * @return
    *    Arbitrary Javascript to add to the HTML page.
    */
   protected final String[] getScript() {
      return ctx.script;
   }

   /**
    * CSS style code.
    *
    * @see HtmlDocSerializer.Builder#style(String...)
    * @return
    *    The CSS instructions to add to the HTML page.
    */
   protected final String[] getStyle() {
      return ctx.style;
   }

   /**
    * Stylesheet import URLs.
    *
    * @see HtmlDocSerializer.Builder#stylesheet(String...)
    * @return
    *    The link to the stylesheet of the HTML page.
    */
   protected final String[] getStylesheet() {
      return ctx.stylesheet;
   }

   /**
    * HTML document template.
    *
    * @see HtmlDocSerializer.Builder#template(Class)
    * @return
    *    The template to use for serializing the page.
    */
   protected final HtmlDocTemplate getTemplate() {
      return ctx.getTemplate();
   }

   /**
    * Performs an action on all widgets defined in his session.
    *
    * @param action The action to perform.
    * @see HtmlDocSerializer.Builder#widgets(Class...)
    * @return This object.
    */
   protected final HtmlDocSerializerSession forEachWidget(Consumer<HtmlWidget> action) {
      ctx.forEachWidget(action);
      return this;
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Other methods
   //-----------------------------------------------------------------------------------------------------------------

   @Override /* ContextSession */
   protected JsonMap properties() {
      return filteredMap("ctx", ctx, "varResolver", getVarResolver());
   }
}