/*
    * Copyright 2019 LINE Corporation
    *
    * LINE Corporation 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:
    *
    *   https://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.linecorp.centraldogma.server.metadata;
  
  import static com.google.common.collect.ImmutableMap.toImmutableMap;
  import static java.util.Objects.requireNonNull;
  
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Objects;
  
  import javax.annotation.Nullable;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
  import com.fasterxml.jackson.annotation.JsonInclude;
  import com.fasterxml.jackson.annotation.JsonInclude.Include;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.base.MoreObjects;
  import com.google.common.collect.ImmutableMap;
  
  import com.linecorp.centraldogma.common.RepositoryNotFoundException;
  import com.linecorp.centraldogma.server.storage.project.Project;
  import com.linecorp.centraldogma.server.storage.repository.HasWeight;
  
  /**
   * Specifies details of a {@link Project}.
   */
  @JsonIgnoreProperties(ignoreUnknown = true)
  @JsonInclude(Include.NON_NULL)
  public class ProjectMetadata implements Identifiable, HasWeight {
  
      public static final ProjectMetadata DOGMA_PROJECT_METADATA =
              new ProjectMetadata("dogma",
                                  ImmutableMap.of(),
                                  ImmutableMap.of(),
                                  null,
                                  ImmutableMap.of(),
                                  new UserAndTimestamp(User.SYSTEM.id()),
                                  null);
  
      /**
       * A project name.
       */
      private final String name;
  
      /**
       * Repositories of this project.
       */
      private final Map<String, RepositoryMetadata> repos;
  
      /**
       * Members of this project.
       */
      private final Map<String, Member> members;
  
      /**
       * Tokens which belong to this project.
       */
      private final Map<String, TokenRegistration> appIds;
  
      /**
       * Specifies when this project is created by whom.
       */
      private final UserAndTimestamp creation;
  
      /**
       * Specifies when this project is removed by whom.
       */
      @Nullable
      private final UserAndTimestamp removal;
  
      /**
       * Creates a new instance.
       */
      @JsonCreator
      public ProjectMetadata(@JsonProperty("name") String name,
                             @JsonProperty("repos") Map<String, RepositoryMetadata> repos,
                             @JsonProperty("members") Map<String, Member> members,
                             @JsonProperty("tokens") @Nullable Map<String, TokenRegistration> tokens,
                             @JsonProperty("appIds") @Nullable Map<String, TokenRegistration> appIds,
                             @JsonProperty("creation") UserAndTimestamp creation,
                             @JsonProperty("removal") @Nullable UserAndTimestamp removal) {
          this.name = requireNonNull(name, "name");
          this.repos = ImmutableMap.copyOf(requireNonNull(repos, "repos"));
         this.members = ImmutableMap.copyOf(requireNonNull(members, "members"));
         if (tokens == null && appIds == null) {
             throw new IllegalArgumentException("tokens or appIds are required");
         }
 
         if (appIds != null) {
             this.appIds = ImmutableMap.copyOf(appIds);
         } else {
             this.appIds = ImmutableMap.copyOf(tokens);
         }
 
         this.creation = requireNonNull(creation, "creation");
         this.removal = removal;
     }
 
     @Override
     public String id() {
         return name;
     }
 
     /**
      * Returns the project name.
      */
     @JsonProperty
     public String name() {
         return name;
     }
 
     /**
      * Returns the metadata of the repositories in this project.
      */
     @JsonProperty
     public Map<String, RepositoryMetadata> repos() {
         return repos;
     }
 
     /**
      * Returns the {@link Member}s of this project.
      */
     @JsonProperty
     public Map<String, Member> members() {
         return members;
     }
 
     /**
      * Returns the {@link TokenRegistration}s of this project.
      */
     @JsonProperty
     public Map<String, TokenRegistration> appIds() {
         return appIds;
     }
 
     /**
      * Returns who created this project when.
      */
     @JsonProperty
     public UserAndTimestamp creation() {
         return creation;
     }
 
     /**
      * Returns who removed this project when.
      */
     @Nullable
     @JsonProperty
     public UserAndTimestamp removal() {
         return removal;
     }
 
     /**
      * Returns the {@link RepositoryMetadata} of the specified repository in this project.
      */
     public RepositoryMetadata repo(String repoName) {
         final RepositoryMetadata repositoryMetadata =
                 repos.get(requireNonNull(repoName, "repoName"));
         if (repositoryMetadata != null) {
             return repositoryMetadata;
         }
         throw RepositoryNotFoundException.of(name, repoName);
     }
 
     /**
      * Returns the {@link Member} of the specified ID in this project.
      */
     public Member member(String memberId) {
         final Member member = memberOrDefault(memberId, null);
         if (member != null) {
             return member;
         }
         throw new MemberNotFoundException(memberId, name());
     }
 
     /**
      * Returns the {@link Member} of the specified ID in this project.
      * {@code defaultMember} is returned if there is no such member.
      */
     @Nullable
     public Member memberOrDefault(String memberId, @Nullable Member defaultMember) {
         final Member member = members.get(requireNonNull(memberId, "memberId"));
         if (member != null) {
             return member;
         }
         return defaultMember;
     }
 
     /**
      * Returns the {@link TokenRegistration} of the specified application ID in this project.
      */
     @Nullable
     public TokenRegistration tokenOrDefault(String appId, @Nullable TokenRegistration defaultToken) {
         final TokenRegistration token = appIds.get(requireNonNull(appId, "appId"));
         if (token != null) {
             return token;
         }
         return defaultToken;
     }
 
     @Override
     public int weight() {
         int weight = name().length();
         for (RepositoryMetadata repo : repos.values()) {
             weight += repo.weight();
         }
         for (Member member : members.values()) {
             weight += member.weight();
         }
         for (TokenRegistration token : appIds.values()) {
             weight += token.weight();
         }
 
         return weight;
     }
 
     @Override
     public boolean equals(Object o) {
         if (this == o) {
             return true;
         }
         if (!(o instanceof ProjectMetadata)) {
             return false;
         }
         final ProjectMetadata that = (ProjectMetadata) o;
         return name.equals(that.name) &&
                repos.equals(that.repos) &&
                members.equals(that.members) &&
                appIds.equals(that.appIds) &&
                creation.equals(that.creation) &&
                Objects.equals(removal, that.removal);
     }
 
     @Override
     public int hashCode() {
         return Objects.hash(name, repos, members, appIds, creation, removal);
     }
 
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(this)
                           .add("name", name())
                           .add("repos", repos())
                           .add("members", members())
                           .add("appIds", appIds())
                           .add("creation", creation())
                           .add("removal", removal())
                           .toString();
     }
 
     /**
      * Returns a new {@link ProjectMetadata} without the Dogma repository.
      */
     public ProjectMetadata withoutDogmaRepo() {
         if (!repos().containsKey(Project.REPO_DOGMA)) {
             return this;
         }
         final Map<String, RepositoryMetadata> filtered =
                 repos().entrySet().stream().filter(entry -> !Project.REPO_DOGMA.equals(entry.getKey()))
                        .collect(toImmutableMap(Entry::getKey, Entry::getValue));
         return new ProjectMetadata(name(),
                                    filtered,
                                    members(),
                                    null,
                                    appIds(),
                                    creation(),
                                    removal());
     }
 }