/*
    * 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 java.util.Objects.requireNonNull;
  
  import java.util.Collection;
  import java.util.Objects;
  import java.util.Set;
  
  import javax.annotation.Nullable;
  
  import com.fasterxml.jackson.annotation.JsonCreator;
  import com.fasterxml.jackson.annotation.JsonProperty;
  import com.google.common.base.MoreObjects;
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.Sets;
  
  import com.linecorp.centraldogma.common.ProjectRole;
  import com.linecorp.centraldogma.server.storage.repository.Repository;
  
  /**
   * A default permission for a {@link Repository}.
   */
  public final class PerRolePermissions {
  
      /**
       * {@link Permission}s for administrators.
       */
      public static final Collection<Permission> READ_WRITE = ImmutableList.of(Permission.READ, Permission.WRITE);
      public static final Collection<Permission> READ_ONLY = ImmutableList.of(Permission.READ);
      public static final Collection<Permission> NO_PERMISSION = ImmutableList.of();
  
      /**
       * The default permission.
       *
       * @deprecated Use {@link #ofDefault()}.
       */
      @Deprecated
      public static final PerRolePermissions DEFAULT =
              new PerRolePermissions(READ_WRITE, READ_WRITE, NO_PERMISSION, null);
      private static final PerRolePermissions internalPermissions =
              new PerRolePermissions(READ_WRITE, NO_PERMISSION, NO_PERMISSION, null);
  
      /**
       * Creates a {@link PerRolePermissions} which allows read/write a repository from an owner.
       */
      public static PerRolePermissions ofInternal() {
          return internalPermissions;
      }
  
      /**
       * Creates a {@link PerRolePermissions} which allows read/write to owners and members.
       */
      public static PerRolePermissions ofDefault() {
          return DEFAULT;
      }
  
      /**
       * Creates a {@link PerRolePermissions} which allows accessing a repository from everyone.
       */
      public static PerRolePermissions ofPublic() {
          return new PerRolePermissions(READ_WRITE, READ_WRITE, READ_WRITE, null);
      }
  
      /**
       * Creates a {@link PerRolePermissions} which allows accessing a repository from a project member.
       */
      public static PerRolePermissions ofPrivate() {
          return new PerRolePermissions(READ_WRITE, READ_WRITE, NO_PERMISSION, null);
      }
  
      /**
       * {@link Permission}s for a {@link ProjectRole#OWNER}.
       */
      private final Set<Permission> owner;
  
      /**
       * {@link Permission}s for a {@link ProjectRole#MEMBER}.
       */
      private final Set<Permission> member;
  
      /**
       * {@link Permission}s for a {@link ProjectRole#GUEST}.
       */
     private final Set<Permission> guest;
 
     /**
      * Creates an instance.
      */
     @JsonCreator
     public PerRolePermissions(@JsonProperty("owner") Iterable<Permission> owner,
                               @JsonProperty("member") Iterable<Permission> member,
                               @JsonProperty("guest") Iterable<Permission> guest,
                               // TODO(minwoox): Remove anonymous field after the migration.
                               @JsonProperty("anonymous") @Nullable Iterable<Permission> unused) {
         this.owner = Sets.immutableEnumSet(requireNonNull(owner, "owner"));
         this.member = Sets.immutableEnumSet(requireNonNull(member, "member"));
         this.guest = Sets.immutableEnumSet(requireNonNull(guest, "guest"));
     }
 
     /**
      * Returns the permissions granted to owners.
      */
     @JsonProperty
     public Set<Permission> owner() {
         return owner;
     }
 
     /**
      * Returns the permissions granted to members.
      */
     @JsonProperty
     public Set<Permission> member() {
         return member;
     }
 
     /**
      * Returns the permissions granted to guests.
      */
     @JsonProperty
     public Set<Permission> guest() {
         return guest;
     }
 
     @Override
     public int hashCode() {
         return Objects.hash(owner, member, guest);
     }
 
     @Override
     public boolean equals(Object o) {
         if (this == o) {
             return true;
         }
         if (o == null || getClass() != o.getClass()) {
             return false;
         }
 
         final PerRolePermissions that = (PerRolePermissions) o;
         return owner.equals(that.owner) &&
                member.equals(that.member) &&
                guest.equals(that.guest);
     }
 
     @Override
     public String toString() {
         return MoreObjects.toStringHelper(this)
                           .add("owner", owner())
                           .add("member", member())
                           .add("guest", guest())
                           .toString();
     }
 }