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// * 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.microservice.resources;

import static org.apache.juneau.dto.html5.HtmlBuilder.*;
import static org.apache.juneau.http.HttpMethodName.*;

import java.io.*;
import java.util.Map;

import org.apache.juneau.*;
import org.apache.juneau.dto.html5.*;
import org.apache.juneau.http.annotation.*;
import org.apache.juneau.http.annotation.Body;
import org.apache.juneau.parser.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.rest.annotation.*;
import org.apache.juneau.rest.exception.*;

/**
 * Shows contents of the microservice configuration file.
 */
@RestResource(
   path="/config",
   title="Configuration",
   description="Contents of configuration file.",
   htmldoc=@HtmlDoc(
      navlinks={
         "up: request:/..",
         "options: servlet:/?method=OPTIONS",
         "edit: servlet:/edit"
      }
   )
)
@SuppressWarnings("javadoc")
public class ConfigResource extends BasicRestServlet {
   private static final long serialVersionUID = 1L;

   @RestMethod(
      name=GET,
      path="/",
      summary="Get config file contents",
      description="Show contents of config file as an ObjectMap.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Config file as a map of map of objects.', 'x-example':{'':{defaultKey:'defaultValue'},'Section1':{key1:'val1',key2:123}}}"
         }
      )
   )
   public ObjectMap getConfig() {
      return getServletConfig().getConfig().asMap();
   }

   @RestMethod(
      name=GET,
      path="/edit",
      summary="Render form entry page for editing config file",
      description="Renders a form entry page for editing the raw text of a config file."
   )
   public Form getConfigEditForm() {
      return form().id("form").action("servlet:/").method("POST").enctype("application/x-www-form-urlencoded").children(
         div()._class("data").children(
            table(
               tr(td().style("text-align:right").children(button("submit","Submit"),button("reset","Reset"))),
               tr(th().child("Contents")),
               tr(th().child(
                  textarea().name("contents").rows(40).cols(120).style("white-space:pre;word-wrap:normal;overflow-x:scroll;font-family:monospace;")
                     .text(getServletConfig().getConfig().toString()))
               )
            )
         )
      );
   }

   @RestMethod(
      name=GET,
      path="/{section}",
      summary="Get config file section contents",
      description="Show contents of config file section as an ObjectMap.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Config file section as a map of objects.', 'x-example':{key1:'val1',key2:123}}"
         }
      )
   )
   public ObjectMap getConfigSection(
         @Path(name="section", description="Section name in config file.", example="REST") String section
      ) throws SectionNotFound, BadConfig {

      return getSection(section);
   }

   @RestMethod(
      name=GET,
      path="/{section}/{key}",
      summary="Get config file entry value",
      description="Show value of config file entry as a simple string.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Entry value.', 'x-example':'servlet:/htdocs/themes/dark.css'}"
         }
      )
   )
   public String getConfigEntry(
         @Path(name="section", description="Section name in config file.", example="REST") String section,
         @Path(name="key", description="Key name in section.", example="theme") String key
      ) throws SectionNotFound, BadConfig {

      return getSection(section).getString(key);
   }

   @RestMethod(
      name=POST,
      path="/",
      summary="Update config file contents",
      description="Update the contents of the config file from a FORM post.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Config file section as a map of objects.', 'x-example':{key1:'val1',key2:123}}"
         }
      )
   )
   public ObjectMap setConfigContentsFormPost(
         @FormData(name="contents", description="New contents in INI file format.") String contents
      ) throws Exception {

      return setConfigContents(new StringReader(contents));
   }

   @RestMethod(
      name=PUT,
      path="/",
      summary="Update config file contents",
      description="Update the contents of the config file from raw text.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Config file section as a map of objects.', 'x-example':{key1:'val1',key2:123}}"
         }
      )
   )
   public ObjectMap setConfigContents(
         @Body(description="New contents in INI file format.") Reader contents
      ) throws Exception {

      return getServletConfig().getConfig().load(contents, true).asMap();
   }

   @RestMethod(
      name=PUT,
      path="/{section}",
      summary="Update config section contents",
      description="Add or overwrite a config file section.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'Config file section as a map of objects.', 'x-example':{key1:'val1',key2:123}}"
         }
      )
   )
   public ObjectMap setConfigSection(
         @Path(name="section", description="Section name in config file.", example="REST") String section,
         @Body(
            description="New contents of config section as a simple map of key/value pairs.",
            example="{theme:'servlet:/htdocs/themes/dark.css'}"
         ) Map<String,Object> contents
      ) throws Exception {

      getServletConfig().getConfig().setSection(section, null, contents);
      return getSection(section);
   }

   @RestMethod(
      name=PUT,
      path="/{section}/{key}",
      summary="Update config entry value",
      description="Add or overwrite a config file entry.",
      swagger=@MethodSwagger(
         responses={
            "200:{ description:'The updated value.', 'x-example':'servlet:/htdocs/themes/dark.css'}"
         }
      )
   )
   public String setConfigValue(
         @Path(name="section", description="Section name in config file.", example="REST") String section,
         @Path(name="key", description="Key name in section.", example="theme") String key,
         @Body(description="New value for entry.", example="servlet:/htdocs/themes/dark.css") String value
      ) throws SectionNotFound, BadConfig {

      getServletConfig().getConfig().set(section + '/' + key, value);
      return getSection(section).getString(key);
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Helper beans
   //-----------------------------------------------------------------------------------------------------------------

   @Response(description="Section not found.")
   private class SectionNotFound extends NotFound {
      private static final long serialVersionUID = 1L;

      SectionNotFound() {
         super("Section not found.");
      }
   }

   @Response(description="The configuration file contained syntax errors and could not be parsed.")
   private class BadConfig extends InternalServerError {
      private static final long serialVersionUID = 1L;

      BadConfig(Exception e) {
         super(e, "The configuration file contained syntax errors and could not be parsed.");
      }
   }

   //-----------------------------------------------------------------------------------------------------------------
   // Helper methods
   //-----------------------------------------------------------------------------------------------------------------

   private ObjectMap getSection(String name) throws SectionNotFound, BadConfig {
      ObjectMap m;
      try {
         m = getServletConfig().getConfig().getSectionAsMap(name);
      } catch (ParseException e) {
         throw new BadConfig(e);
      }
      if (m == null)
         throw new SectionNotFound();
      return m;
   }
}