/*
 * 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.rest.annotation;

import static org.apache.juneau.commons.utils.CollectionUtils.*;
import static org.apache.juneau.commons.utils.StringUtils.*;
import static org.apache.juneau.commons.utils.Utils.*;

import java.lang.annotation.*;
import java.nio.charset.*;
import java.util.function.*;

import org.apache.juneau.*;
import org.apache.juneau.encoders.*;
import org.apache.juneau.http.*;
import org.apache.juneau.commons.annotation.*;
import org.apache.juneau.commons.reflect.*;
import org.apache.juneau.rest.*;
import org.apache.juneau.rest.converter.*;
import org.apache.juneau.rest.guard.*;
import org.apache.juneau.rest.httppart.*;
import org.apache.juneau.rest.matcher.*;
import org.apache.juneau.serializer.*;
import org.apache.juneau.svl.*;

/**
 * Utility classes and methods for the {@link RestOp @RestOp} annotation.
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/RestOpAnnotatedMethodBasics">@RestOp-Annotated Method Basics</a>
 * </ul>
 */
public class RestOpAnnotation {
   /**
    * Builder class.
    *
    * <h5 class='section'>See Also:</h5><ul>
    *    <li class='jm'>{@link org.apache.juneau.BeanContext.Builder#annotations(Annotation...)}
    * </ul>
    */
   @SuppressWarnings("unchecked")
   public static class Builder extends AppliedAnnotationObject.BuilderM {

      private String[] description = {};
      private Class<? extends RestConverter>[] converters = new Class[0];
      private Class<? extends RestGuard>[] guards = new Class[0];
      private Class<? extends RestMatcher>[] matchers = new Class[0];
      private Class<? extends Encoder>[] encoders = new Class[0];
      private Class<? extends Serializer>[] serializers = new Class[0];
      private Class<?>[] parsers = {};
      private OpSwagger swagger = OpSwaggerAnnotation.DEFAULT;
      private String clientVersion = "", debug = "", defaultAccept = "", defaultCharset = "", defaultContentType = "", maxInput = "", method = "", rolesDeclared = "", roleGuard = "", summary = "",
         value = "";
      private String[] consumes = {}, defaultRequestFormData = {}, defaultRequestQueryData = {}, defaultRequestAttributes = {}, defaultRequestHeaders = {}, defaultResponseHeaders = {}, path = {},
         produces = {};

      /**
       * Constructor.
       */
      protected Builder() {
         super(RestOp.class);
      }

      /**
       * Instantiates a new {@link RestOp @RestOp} object initialized with this builder.
       *
       * @return A new {@link RestOp @RestOp} object.
       */
      public RestOp build() {
         return new Object(this);
      }

      /**
       * Sets the description property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder description(String...value) {
         description = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#clientVersion()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder clientVersion(String value) {
         clientVersion = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#consumes()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder consumes(String...value) {
         consumes = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#converters()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      @SafeVarargs
      public final Builder converters(Class<? extends RestConverter>...value) {
         converters = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#debug()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder debug(String value) {
         debug = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultAccept()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultAccept(String value) {
         defaultAccept = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultCharset()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultCharset(String value) {
         defaultCharset = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultContentType()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultContentType(String value) {
         defaultContentType = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultRequestAttributes()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultRequestAttributes(String...value) {
         defaultRequestAttributes = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultRequestFormData()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultRequestFormData(String...value) {
         defaultRequestFormData = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultRequestHeaders()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultRequestHeaders(String...value) {
         defaultRequestHeaders = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultRequestQueryData()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultRequestQueryData(String...value) {
         defaultRequestQueryData = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#defaultResponseHeaders()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder defaultResponseHeaders(String...value) {
         defaultResponseHeaders = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#encoders()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      @SafeVarargs
      public final Builder encoders(Class<? extends Encoder>...value) {
         encoders = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#guards()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      @SafeVarargs
      public final Builder guards(Class<? extends RestGuard>...value) {
         guards = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#matchers()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      @SafeVarargs
      public final Builder matchers(Class<? extends RestMatcher>...value) {
         matchers = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#maxInput()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder maxInput(String value) {
         maxInput = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#method()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder method(String value) {
         method = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#parsers()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder parsers(Class<?>...value) {
         parsers = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#path()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder path(String...value) {
         path = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#produces()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder produces(String...value) {
         produces = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#roleGuard()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder roleGuard(String value) {
         roleGuard = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#rolesDeclared()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder rolesDeclared(String value) {
         rolesDeclared = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#serializers()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      @SafeVarargs
      public final Builder serializers(Class<? extends Serializer>...value) {
         serializers = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#summary()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder summary(String value) {
         summary = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#swagger()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder swagger(OpSwagger value) {
         swagger = value;
         return this;
      }

      /**
       * Sets the {@link RestOp#value()} property on this annotation.
       *
       * @param value The new value for this property.
       * @return This object.
       */
      public Builder value(String value) {
         this.value = value;
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.Builder */
      public Builder on(String...value) {
         super.on(value);
         return this;
      }

      @Override /* Overridden from AppliedAnnotationObject.BuilderM */
      public Builder on(java.lang.reflect.Method...value) {
         super.on(value);
         return this;
      }
   
      @Override /* Overridden from AppliedAnnotationObject.BuilderM */
      public Builder on(MethodInfo...value) {
         super.on(value);
         return this;
      }

   }

   /**
    * Applies {@link RestOp} annotations to a {@link org.apache.juneau.rest.RestOpContext.Builder}.
    */
   public static class RestOpContextApply extends AnnotationApplier<RestOp,RestOpContext.Builder> {

      /**
       * Constructor.
       *
       * @param vr The resolver for resolving values in annotations.
       */
      public RestOpContextApply(VarResolverSession vr) {
         super(RestOp.class, RestOpContext.Builder.class, vr);
      }

      @Override
      public void apply(AnnotationInfo<RestOp> ai, RestOpContext.Builder b) {
         RestOp a = ai.inner();

         classes(a.serializers()).ifPresent(x -> b.serializers().set(x));
         classes(a.parsers()).ifPresent(x -> b.parsers().set(x));
         classes(a.encoders()).ifPresent(x -> b.encoders().set(x));
         stream(a.produces()).map(MediaType::of).forEach(x -> b.produces(x));
         stream(a.consumes()).map(MediaType::of).forEach(x -> b.consumes(x));
         stream(a.defaultRequestHeaders()).map(HttpHeaders::stringHeader).forEach(x -> b.defaultRequestHeaders().setDefault(x));
         stream(a.defaultResponseHeaders()).map(HttpHeaders::stringHeader).forEach(x -> b.defaultResponseHeaders().setDefault(x));
         stream(a.defaultRequestAttributes()).map(BasicNamedAttribute::ofPair).forEach(x -> b.defaultRequestAttributes().add(x));
         stream(a.defaultRequestQueryData()).map(HttpParts::basicPart).forEach(x -> b.defaultRequestQueryData().setDefault(x));
         stream(a.defaultRequestFormData()).map(HttpParts::basicPart).forEach(x -> b.defaultRequestFormData().setDefault(x));
         string(a.defaultAccept()).map(HttpHeaders::accept).ifPresent(x -> b.defaultRequestHeaders().setDefault(x));
         string(a.defaultContentType()).map(HttpHeaders::contentType).ifPresent(x -> b.defaultRequestHeaders().setDefault(x));
         b.converters().append(a.converters());
         b.guards().append(a.guards());
         b.matchers().append(a.matchers());
         string(a.clientVersion()).ifPresent(x -> b.clientVersion(x));
         string(a.defaultCharset()).map(Charset::forName).ifPresent(x -> b.defaultCharset(x));
         string(a.maxInput()).ifPresent(x -> b.maxInput(x));
         stream(a.path()).forEach(x -> b.path(x));
         cdl(a.rolesDeclared()).forEach(x -> b.rolesDeclared(x));
         string(a.roleGuard()).ifPresent(x -> b.roleGuard(x));

         string(a.method()).ifPresent(x -> b.httpMethod(x));
         string(a.debug()).map(Enablement::fromString).ifPresent(x -> b.debug(x));

         var v = trim(string(a.value()).orElse(null));
         if (nn(v)) {
            var i = v.indexOf(' ');
            if (i == -1) {
               b.httpMethod(v);
            } else {
               b.httpMethod(v.substring(0, i).trim());
               b.path(v.substring(i).trim());
            }
         }
      }

   }

   private static class Object extends AppliedAnnotationObject implements RestOp {

      private final String[] description;
      private final Class<? extends RestConverter>[] converters;
      private final Class<? extends RestGuard>[] guards;
      private final Class<? extends RestMatcher>[] matchers;
      private final Class<? extends Encoder>[] encoders;
      private final Class<? extends Serializer>[] serializers;
      private final Class<?>[] parsers;
      private final OpSwagger swagger;
      private final String clientVersion, debug, defaultAccept, defaultCharset, defaultContentType, maxInput, method, rolesDeclared, roleGuard, summary, value;
      private final String[] consumes, defaultRequestFormData, defaultRequestQueryData, defaultRequestAttributes, defaultRequestHeaders, defaultResponseHeaders, path, produces;

      Object(RestOpAnnotation.Builder b) {
         super(b);
         description = copyOf(b.description);
         clientVersion = b.clientVersion;
         consumes = copyOf(b.consumes);
         converters = copyOf(b.converters);
         debug = b.debug;
         defaultAccept = b.defaultAccept;
         defaultCharset = b.defaultCharset;
         defaultContentType = b.defaultContentType;
         defaultRequestFormData = copyOf(b.defaultRequestFormData);
         defaultRequestQueryData = copyOf(b.defaultRequestQueryData);
         defaultRequestAttributes = copyOf(b.defaultRequestAttributes);
         defaultRequestHeaders = copyOf(b.defaultRequestHeaders);
         defaultResponseHeaders = copyOf(b.defaultResponseHeaders);
         encoders = copyOf(b.encoders);
         guards = copyOf(b.guards);
         matchers = copyOf(b.matchers);
         maxInput = b.maxInput;
         method = b.method;
         parsers = copyOf(b.parsers);
         path = copyOf(b.path);
         produces = copyOf(b.produces);
         roleGuard = b.roleGuard;
         rolesDeclared = b.rolesDeclared;
         serializers = copyOf(b.serializers);
         summary = b.summary;
         swagger = b.swagger;
         value = b.value;
      }

      @Override /* Overridden from RestOp */
      public String clientVersion() {
         return clientVersion;
      }

      @Override /* Overridden from RestOp */
      public String[] consumes() {
         return consumes;
      }

      @Override /* Overridden from RestOp */
      public Class<? extends RestConverter>[] converters() {
         return converters;
      }

      @Override /* Overridden from RestOp */
      public String debug() {
         return debug;
      }

      @Override /* Overridden from RestOp */
      public String defaultAccept() {
         return defaultAccept;
      }

      @Override /* Overridden from RestOp */
      public String defaultCharset() {
         return defaultCharset;
      }

      @Override /* Overridden from RestOp */
      public String defaultContentType() {
         return defaultContentType;
      }

      @Override /* Overridden from RestOp */
      public String[] defaultRequestAttributes() {
         return defaultRequestAttributes;
      }

      @Override /* Overridden from RestOp */
      public String[] defaultRequestFormData() {
         return defaultRequestFormData;
      }

      @Override /* Overridden from RestOp */
      public String[] defaultRequestHeaders() {
         return defaultRequestHeaders;
      }

      @Override /* Overridden from RestOp */
      public String[] defaultRequestQueryData() {
         return defaultRequestQueryData;
      }

      @Override /* Overridden from RestOp */
      public String[] defaultResponseHeaders() {
         return defaultResponseHeaders;
      }

      @Override /* Overridden from RestOp */
      public Class<? extends Encoder>[] encoders() {
         return encoders;
      }

      @Override /* Overridden from RestOp */
      public Class<? extends RestGuard>[] guards() {
         return guards;
      }

      @Override /* Overridden from RestOp */
      public Class<? extends RestMatcher>[] matchers() {
         return matchers;
      }

      @Override /* Overridden from RestOp */
      public String maxInput() {
         return maxInput;
      }

      @Override /* Overridden from RestOp */
      public String method() {
         return method;
      }

      @Override /* Overridden from RestOp */
      public Class<?>[] parsers() {
         return parsers;
      }

      @Override /* Overridden from RestOp */
      public String[] path() {
         return path;
      }

      @Override /* Overridden from RestOp */
      public String[] produces() {
         return produces;
      }

      @Override /* Overridden from RestOp */
      public String roleGuard() {
         return roleGuard;
      }

      @Override /* Overridden from RestOp */
      public String rolesDeclared() {
         return rolesDeclared;
      }

      @Override /* Overridden from RestOp */
      public Class<? extends Serializer>[] serializers() {
         return serializers;
      }

      @Override /* Overridden from RestOp */
      public String summary() {
         return summary;
      }

      @Override /* Overridden from RestOp */
      public OpSwagger swagger() {
         return swagger;
      }

      @Override /* Overridden from RestOp */
      public String value() {
         return value;
      }

      @Override /* Overridden from annotation */
      public String[] description() {
         return description;
      }
   }

   /** Default value */
   public static final RestOp DEFAULT = create().build();
   /**
    * Predicate that can be used to filter annotation streams.
    *
    * <p>
    * Example: <c>classInfo.getAnnotations().stream().filter(REST_OP_GROUP)</c>
    */
   public static final Predicate<AnnotationInfo<?>> REST_OP_GROUP = x -> x.isInGroup(RestOp.class);

   /**
    * Instantiates a new builder for this class.
    *
    * @return A new builder object.
    */
   public static Builder create() {
      return new Builder();
   }
}