-----------------------------------------------------------------------
--  awa-blogs-beans -- Beans for blog module
--  Copyright (C) 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2019, 2020 Stephane Carrez
--  Written by Stephane Carrez (Stephane.Carrez@gmail.com)
--
--  Licensed 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.
-----------------------------------------------------------------------

with Ada.Calendar;
with Ada.Strings.Unbounded;
with Ada.Containers.Indefinite_Hashed_Maps;
with Ada.Strings.Wide_Wide_Hash;
with Ada.Strings.Wide_Wide_Unbounded;

with Util.Beans.Basic;
with Util.Beans.Objects;

with ADO;
with ADO.Objects;

with Wiki.Strings;
with Wiki.Plugins.Conditions;
with Wiki.Plugins.Variables;

with ASF.Helpers.Beans;

with AWA.Blogs.Modules;
with AWA.Blogs.Models;
with AWA.Tags.Beans;
with AWA.Counters.Beans;
with AWA.Events;
with AWA.Components.Wikis;

--  == Ada Beans ==
--  Several bean types are provided to represent and manage the blogs and their posts.
--  The blog module registers the bean constructors when it is initialized.
--  To use them, one must declare a bean definition in the application XML configuration.
package AWA.Blogs.Beans is

   --  Attributes exposed by <b>Post_Bean</b>
   BLOG_ID_ATTR      : constant String := "blogId";
   POST_ID_ATTR      : constant String := "id";
   POST_UID_ATTR     : constant String := "uid";
   POST_TITLE_ATTR   : constant String := "title";
   POST_TEXT_ATTR    : constant String := "text";
   POST_URI_ATTR     : constant String := "uri";
   POST_STATUS_ATTR  : constant String := "status";
   POST_USERNAME_ATTR : constant String := "username";
   POST_IMAGE_ATTR          : constant String := "image";
   POST_DESCRIPTION_ATTR    : constant String := "description";
   POST_TAG_ATTR            : constant String := "tags";
   POST_ALLOW_COMMENTS_ATTR : constant String := "allow_comments";
   COUNTER_ATTR             : constant String := "counter";

   use Ada.Strings.Wide_Wide_Unbounded;

   --  Get a select item list which contains a list of blog post formats.
   function Create_Format_List_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                                     return Util.Beans.Basic.Readonly_Bean_Access;

   package Image_Info_Maps is
     new Ada.Containers.Indefinite_Hashed_Maps (Key_Type        => Wiki.Strings.WString,
                                                Element_Type    => Models.Image_Info,
                                                Hash            => Ada.Strings.Wide_Wide_Hash,
                                                Equivalent_Keys => "=",
                                                "="             => Models."=");

   type Post_Links_Bean is new AWA.Components.Wikis.Link_Renderer_Bean with record
      --  The wiki space identifier.
      Post_Id : ADO.Identifier;
      Images  : Image_Info_Maps.Map;
   end record;

   procedure Make_Image_Link (Renderer : in out Post_Links_Bean;
                              Link     : in Wiki.Strings.WString;
                              Info     : in AWA.Blogs.Models.Image_Info;
                              URI      : out Unbounded_Wide_Wide_String;
                              Width    : in out Natural;
                              Height   : in out Natural);

   procedure Find_Image_Link (Renderer : in out Post_Links_Bean;
                              Link     : in Wiki.Strings.WString;
                              URI      : out Unbounded_Wide_Wide_String;
                              Width    : in out Natural;
                              Height   : in out Natural);

   --  Get the image link that must be rendered from the wiki image link.
   overriding
   procedure Make_Image_Link (Renderer : in out Post_Links_Bean;
                              Link     : in Wiki.Strings.WString;
                              URI      : out Unbounded_Wide_Wide_String;
                              Width    : in out Natural;
                              Height   : in out Natural);

   --  Get the page link that must be rendered from the wiki page link.
   overriding
   procedure Make_Page_Link (Renderer : in out Post_Links_Bean;
                             Link     : in Wiki.Strings.WString;
                             URI      : out Unbounded_Wide_Wide_String;
                             Exists   : out Boolean);

   --  ------------------------------
   --  Blog Bean
   --  ------------------------------
   --  The <b>Blog_Bean</b> holds the information about the current blog.
   --  It allows to create the blog as well as update its primary title.
   type Blog_Bean is new AWA.Blogs.Models.Blog_Bean with record
      Module  : AWA.Blogs.Modules.Blog_Module_Access := null;
   end record;
   type Blog_Bean_Access is access all Blog_Bean'Class;

   --  Get the value identified by the name.
   overriding
   function Get_Value (From : in Blog_Bean;
                       Name : in String) return Util.Beans.Objects.Object;

   --  Set the value identified by the name.
   overriding
   procedure Set_Value (From  : in out Blog_Bean;
                        Name  : in String;
                        Value : in Util.Beans.Objects.Object);

   --  Create a new blog.
   overriding
   procedure Create (Bean    : in out Blog_Bean;
                     Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Load the blog information.
   overriding
   procedure Load (Bean    : in out Blog_Bean;
                   Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Handle an event to create the blog entry automatically.
   overriding
   procedure Create_Default (Bean    : in out Blog_Bean;
                             Event   : in AWA.Events.Module_Event'Class);

   --  Create the Blog_Bean bean instance.
   function Create_Blog_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                              return Util.Beans.Basic.Readonly_Bean_Access;

   function Get_Blog_Bean is
     new ASF.Helpers.Beans.Get_Bean (Element_Type   => Blog_Bean,
                                     Element_Access => Blog_Bean_Access);

   --  ------------------------------
   --  Post Bean
   --  ------------------------------
   --  The <b>Post_Bean</b> is used to create, update or display a post associated with a blog.
   type Post_Bean is new AWA.Blogs.Models.Post_Bean
     and Wiki.Plugins.Plugin_Factory with record
      Module  : AWA.Blogs.Modules.Blog_Module_Access := null;
      Blog_Id : ADO.Identifier := ADO.NO_IDENTIFIER;

      --  List of tags associated with the post.
      Tags      : aliased AWA.Tags.Beans.Tag_List_Bean;
      Tags_Bean : Util.Beans.Basic.Readonly_Bean_Access;

      --  The post page links.
      Links         : aliased Post_Links_Bean;
      Links_Bean    : Util.Beans.Basic.Readonly_Bean_Access;

      --  The read post counter associated with the post.
      Counter       : aliased AWA.Counters.Beans.Counter_Bean (Of_Type => ADO.Objects.KEY_INTEGER,
                                                               Of_Class => Models.POST_TABLE);
      Counter_Bean  : Util.Beans.Basic.Readonly_Bean_Access;

      --  Condition plugin.
      Condition     : aliased Wiki.Plugins.Conditions.Condition_Plugin;

      --  Variable plugin.
      Variable      : aliased Wiki.Plugins.Variables.Variable_Plugin;
      List_Variable : aliased Wiki.Plugins.Variables.List_Variable_Plugin;

      --  The post description generated from the content.
      Description   : Ada.Strings.Unbounded.Unbounded_String;
      Image_Link    : Wiki.Strings.UString;
   end record;
   type Post_Bean_Access is access all Post_Bean'Class;

   --  Build the URI from the post title and the post date.
   function Get_Predefined_Uri (Title : in String;
                                Date  : in Ada.Calendar.Time) return String;

   --  Make the post description from the summary or the content.
   procedure Make_Description (From : in out Post_Bean);

   --  Get the value identified by the name.
   overriding
   function Get_Value (From : in Post_Bean;
                       Name : in String) return Util.Beans.Objects.Object;

   --  Set the value identified by the name.
   overriding
   procedure Set_Value (From  : in out Post_Bean;
                        Name  : in String;
                        Value : in Util.Beans.Objects.Object);

   --  Find a plugin knowing its name.
   overriding
   function Find (Factory : in Post_Bean;
                  Name    : in String) return Wiki.Plugins.Wiki_Plugin_Access;

   --  Load the post.
   procedure Load_Post (Post : in out Post_Bean;
                        Id   : in ADO.Identifier);

   --  Create or save the post.
   overriding
   procedure Save (Bean    : in out Post_Bean;
                   Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Delete a post.
   overriding
   procedure Delete (Bean    : in out Post_Bean;
                     Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Load the post from the URI for the public display.
   overriding
   procedure Load (Bean    : in out Post_Bean;
                   Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Setup the bean to create a new post.
   overriding
   procedure Setup (Bean    : in out Post_Bean;
                    Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Load the post from the URI for the administrator.
   overriding
   procedure Load_Admin (Bean    : in out Post_Bean;
                         Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Load the post from the URI either with visible comments or with all comments.
   procedure Load (Bean         : in out Post_Bean;
                   Outcome      : in out Ada.Strings.Unbounded.Unbounded_String;
                   Publish_Only : in Boolean);

   --  Create the Post_Bean bean instance.
   function Create_Post_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                              return Util.Beans.Basic.Readonly_Bean_Access;

   --  ------------------------------
   --  Post List Bean
   --  ------------------------------
   --  The <b>Post_List_Bean</b> gives a list of visible posts to be displayed to users.
   --  The list can be filtered by a given tag.  The list pagination is supported.
   type Post_List_Bean is new AWA.Blogs.Models.Post_List_Bean with record
      Posts      : aliased AWA.Blogs.Models.Post_Info_List_Bean;
      Service    : Modules.Blog_Module_Access := null;
      Tags       : AWA.Tags.Beans.Entity_Tag_Map;
      Posts_Bean : AWA.Blogs.Models.Post_Info_List_Bean_Access;

      --  The post page links.
      Links         : aliased Post_Links_Bean;
      Links_Bean    : access Post_Links_Bean;

      --  The read post counter associated with the post.
      Counter       : aliased AWA.Counters.Beans.Counter_Bean (Of_Type => ADO.Objects.KEY_INTEGER,
                                                               Of_Class => Models.POST_TABLE);
      Counter_Bean  : AWA.Counters.Beans.Counter_Bean_Access;
   end record;
   type Post_List_Bean_Access is access all Post_List_Bean'Class;

   --  Get the value identified by the name.
   overriding
   function Get_Value (From : in Post_List_Bean;
                       Name : in String) return Util.Beans.Objects.Object;

   --  Set the value identified by the name.
   overriding
   procedure Set_Value (From  : in out Post_List_Bean;
                        Name  : in String;
                        Value : in Util.Beans.Objects.Object);

   overriding
   procedure Load (From    : in out Post_List_Bean;
                   Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Load the list of posts.  If a tag was set, filter the list of posts with the tag.
   procedure Load_List (Into : in out Post_List_Bean);

   --  Create the Post_List_Bean bean instance.
   function Create_Post_List_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                                   return Util.Beans.Basic.Readonly_Bean_Access;

   --  Get a select item list which contains a list of post status.
   function Create_Status_List (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                                return Util.Beans.Basic.Readonly_Bean_Access;

   type Init_Flag is (INIT_BLOG_LIST, INIT_POST_LIST, INIT_COMMENT_LIST);
   type Init_Map is array (Init_Flag) of Boolean;

   --  ------------------------------
   --  Admin List Bean
   --  ------------------------------
   --  The <b>Blog_Admin_Bean</b> is used for the administration of a blog.  It gives the
   --  list of posts that are created, published or not.
   type Blog_Admin_Bean is new Util.Beans.Basic.Bean with record
      Module : AWA.Blogs.Modules.Blog_Module_Access := null;

      --  The blog identifier.
      Blog_Id          : ADO.Identifier := ADO.NO_IDENTIFIER;

      --  List of blogs.
      Blog_List        : aliased AWA.Blogs.Models.Blog_Info_List_Bean;
      Blog_List_Bean   : AWA.Blogs.Models.Blog_Info_List_Bean_Access;

      --  List of posts.
      Post_List        : aliased AWA.Blogs.Models.Admin_Post_Info_List_Bean;
      Post_List_Bean   : AWA.Blogs.Models.Admin_Post_Info_List_Bean_Access;

      --  List of comments.
      Comment_List      : aliased AWA.Blogs.Models.Comment_Info_List_Bean;
      Comment_List_Bean : AWA.Blogs.Models.Comment_Info_List_Bean_Access;

      --  Initialization flags.
      Init_Flags       : aliased Init_Map := (others => False);
      Flags            : access Init_Map;
   end record;
   type Blog_Admin_Bean_Access is access all Blog_Admin_Bean;

   --  Get the blog identifier.
   function Get_Blog_Id (List : in Blog_Admin_Bean) return ADO.Identifier;

   --  Load the posts associated with the current blog.
   procedure Load_Posts (List : in Blog_Admin_Bean);

   --  Load the comments associated with the current blog.
   procedure Load_Comments (List : in Blog_Admin_Bean);

   overriding
   function Get_Value (List : in Blog_Admin_Bean;
                       Name : in String) return Util.Beans.Objects.Object;

   --  Set the value identified by the name.
   overriding
   procedure Set_Value (From  : in out Blog_Admin_Bean;
                        Name  : in String;
                        Value : in Util.Beans.Objects.Object);

   --  Load the list of blogs.
   procedure Load_Blogs (List : in Blog_Admin_Bean);

   --  Create the Blog_Admin_Bean bean instance.
   function Create_Blog_Admin_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                                    return Util.Beans.Basic.Readonly_Bean_Access;

   --  ------------------------------
   --  Blog Statistics Bean
   --  ------------------------------
   --  The <b>Blog_Stat_Bean</b> is used to report various statistics about the blog or some post.
   type Blog_Stat_Bean is new AWA.Blogs.Models.Stat_List_Bean with record
      Module           : AWA.Blogs.Modules.Blog_Module_Access := null;

      Stats            : aliased AWA.Blogs.Models.Month_Stat_Info_List_Bean;
      Stats_Bean       : AWA.Blogs.Models.Month_Stat_Info_List_Bean_Access;
   end record;
   type Blog_Stat_Bean_Access is access all Blog_Stat_Bean;

   overriding
   function Get_Value (List : in Blog_Stat_Bean;
                       Name : in String) return Util.Beans.Objects.Object;

   --  Set the value identified by the name.
   overriding
   procedure Set_Value (From  : in out Blog_Stat_Bean;
                        Name  : in String;
                        Value : in Util.Beans.Objects.Object);

   --  Load the statistics information.
   overriding
   procedure Load (List    : in out Blog_Stat_Bean;
                   Outcome : in out Ada.Strings.Unbounded.Unbounded_String);

   --  Create the Blog_Stat_Bean bean instance.
   function Create_Blog_Stat_Bean (Module : in AWA.Blogs.Modules.Blog_Module_Access)
                                    return Util.Beans.Basic.Readonly_Bean_Access;

end AWA.Blogs.Beans;