# Redmine - project management software
# Copyright (C) 2006-2013  Jean-Philippe Lang
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class Message < ActiveRecord::Base
  include Redmine::SafeAttributes
  include UserScoreHelper
  include ApplicationHelper
  has_many_kindeditor_assets :assets, :dependent => :destroy
  belongs_to :board,:touch => true
  belongs_to :author, :class_name => 'User', :foreign_key => 'author_id'
  has_many :praise_tread, as: :praise_tread_object, dependent: :destroy
  # has_many :org_subfield_messages, :dependent => :destroy
  # has_many :org_subfields, :through => :org_subfield_messages

  acts_as_tree :counter_cache => :replies_count, :order => "#{Message.table_name}.created_on ASC"
  acts_as_attachable
  belongs_to :last_reply, :class_name => 'Message', :foreign_key => 'last_reply_id'
  
  # added by fq
  has_many :acts, :class_name => 'Activity', :as => :act, :dependent => :destroy
  # 被ForgeActivity虚拟关联
  has_many :forge_acts, :class_name => 'ForgeActivity',:as =>:forge_act ,:dependent => :destroy
  # 课程动态
  has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
  # end
  # 课程/项目 消息
  has_many :course_messages, :class_name =>'CourseMessage', :as => :course_message, :dependent => :destroy
  has_many :forge_messages, :class_name => 'ForgeMessage', :as => :forge_message, :dependent => :destroy
  has_many :at_messages, as: :at_message, dependent: :destroy

  has_many :ActivityNotifies,:as => :activity, :dependent => :destroy

  acts_as_searchable :columns => ['subject', 'content'],
                     :include => {:board => :project},
                     :project_key => "#{Board.table_name}.project_id",
                     :date_column => "#{table_name}.created_on"
  acts_as_searchable :columns => ['subject', 'content'],
                     :include => {:board => :course},
                     :course_key => "#{Board.table_name}.course_id",
                     :date_column => "#{table_name}.created_at"
  acts_as_event :title => Proc.new {|o| "#{o.board.name}: #{o.subject}"},
                :description => :content,
                :datetime => :updated_on,
                # :datetime => "#{Message.table_name}.created_on",
                :group => :parent,
                :type => Proc.new {|o| o.parent_id.nil? ? 'message' : 'reply'},
                :url => Proc.new {|o| {:controller => 'messages', :action => 'show', :board_id => o.board_id}.merge(o.parent_id.nil? ? {:id => o.id} :
                                                                                                                                       {:id => o.parent_id, :r => o.id, :anchor => "message-#{o.id}"})}

  acts_as_activity_provider :find_options => {:include => [{:board => :project}, :author]},
                            :author_key => :author_id
  acts_as_activity_provider :find_options => {:include => [{:board => :course}, :author]},
                            :type => 'course_messages',
                            :author_key => :author_id
  acts_as_watchable

  validates_presence_of :board, :subject, :content
  validates_length_of :subject, :maximum => 255
  validate :cannot_reply_to_locked_topic, :on => :create

  after_create :add_author_as_watcher, :reset_counters!
  after_update :update_messages_board
  after_destroy :reset_counters!,:down_user_score,:delete_kindeditor_assets
  
  after_create :act_as_activity,:act_as_course_activity,:be_user_score,:act_as_forge_activity, :act_as_system_message, :send_mail, :act_as_student_score, :act_as_at_message
  #before_save :be_user_score

  scope :visible, lambda {|*args|
    includes(:board => :project).where(Project.allowed_to_condition(args.shift || User.current, :view_messages, *args))
  }

  scope :course_visible, lambda {|*args|
    includes(:board => :course).where(Course.allowed_to_condition(args.shift || User.current, :view_course_messages, *args))
  }


  safe_attributes 'subject', 'content', 'reply_id'
  safe_attributes  'board_id','locked', 'sticky',
    :if => lambda {|message, user|
      if message.project
        user.allowed_to?(:edit_messages, message.project)
      else
        user.allowed_to?(:edit_messages, message.course)
      end
    }

  def topic?
    parent_id.nil?
  end

  def visible?(user=User.current)
    if project
      !user.nil? && user.allowed_to?(:view_messages, project)
    elsif course
      !user.nil? && user.allowed_to?(:view_messages, course)
    end
  end

  def cannot_reply_to_locked_topic
    # Can not reply to a locked topic
    errors.add :base, 'Topic is locked' if root.locked? && self != root
  end

  def update_messages_board
    if board_id_changed?
      Message.update_all({:board_id => board_id}, ["id = ? OR parent_id = ?", root.id, root.id])
      Board.reset_counters!(board_id_was)
      Board.reset_counters!(board_id)
    end
  end

  def reset_counters!
    if parent && parent.id
      Message.update_all({:last_reply_id => parent.children.maximum(:id)}, {:id => parent.id})
    end
    board.reset_counters!
  end

  def sticky=(arg)
    write_attribute :sticky, (arg == true || arg.to_s == '1' ? 1 : 0)
  end

  def sticky?
    sticky == 1
  end

  def project
    board.project
  end

  def course
    board.course
  end

  def course_editable_by?(usr)
    usr && usr.logged? && (usr.allowed_to?(:edit_messages, course) || (self.author == usr && usr.allowed_to?(:edit_own_messages, course)))
  end

  def org_subfield_editable_by?(usr)
    usr && usr.logged? && (usr.admin?  || self.author == usr ||usr.admin_of_org?(self.board.org_subfield.organization))
  end

  def course_destroyable_by?(usr)
    usr && usr.logged? && (usr.allowed_to?(:delete_messages, course) || (self.author == usr && usr.allowed_to?(:delete_own_messages, course)))
  end

  def editable_by?(usr)
    usr && usr.logged? && (usr.allowed_to?(:edit_messages, project) || (self.author == usr && usr.allowed_to?(:edit_own_messages, project)))
  end

  def destroyable_by?(usr)
    usr && usr.logged? && (usr.allowed_to?(:delete_messages, project) || (self.author == usr && usr.allowed_to?(:delete_own_messages, project)))
  end

  def set_notify_id(notify_id)
    @notify_id= notify_id
  end
  def get_notify_id()
    return @notify_id
  end
  def set_notify_is_read(notify_is_read)
    @notify_is_read = notify_is_read
  end
  def get_notify_is_read()
    return @notify_is_read
  end

  private

  def add_author_as_watcher
    Watcher.create(:watchable => self.root, :user => author)
  end
  
  # fq
  def act_as_activity
    self.acts << Activity.new(:user_id => self.author_id)
  end
  # end

  # Time 2015-02-27 14:32:25
  # Author lizanle
  # Description 
  def act_as_forge_activity
    # 如果project为空，那么就是课程相关的消息
    if self.board.project_id != -1 && self.parent_id.nil?
      self.forge_acts << ForgeActivity.new(:user_id => self.author_id,
                                             :project_id => self.board.project.id)
    end
  end

  #课程动态公共表记录
  def act_as_course_activity
    if self.course && self.parent_id.nil?
      self.course_acts << CourseActivity.new(:user_id => self.author_id,:course_id => self.board.course_id)
    end
  end

  # 课程讨论区添加消息:
  # 老师发帖所有人都能收到消息
  # 学生发帖，有人回复则给该学生消息，没回复则不给其它人发送消息
  # 帖子被回复的可以收到消息通知
  # 项目讨论区添加消息：
  # 主贴项目成员都能收到
  # 回帖：帖子的发布人收到
  def act_as_system_message
    if self.course
      if self.parent_id.nil?   # 主贴
        self.course.members.each do |m|
          if self.author.allowed_to?(:as_teacher, self.course) &&  m.user_id != self.author_id   # 老师 自己的帖子不给自己发送消息
            self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.board.course_id, :viewed => false)
          end
        end
      else    # 回帖
        self.course.members.each do |m|
          if m.user_id ==  Message.find(self.parent_id).author_id  && m.user_id != self.author_id  # 只针对主贴回复，回复自己的帖子不发消息
            self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.board.course_id, :viewed => false)
          end
        end
      end
    elsif self.project  # 项目相关
      if self.parent_id.nil?   # 主贴
        self.project.members.each do |m|
          if  m.user_id != self.author_id
            self.forge_messages << ForgeMessage.new(:user_id => m.user_id, :project_id => self.board.project_id, :viewed => false)
          end
        end
      else    # 回帖
        self.project.members.each do |m|
          if m.user_id ==  Message.find(self.parent_id).author_id  && m.user_id != self.author_id  # 只针对主贴回复，回复自己的帖子不发消息
            self.forge_messages << ForgeMessage.new(:user_id => m.user_id, :project_id => self.board.project_id, :viewed => false)
          end
        end
      end
    end
  end

  def act_as_at_message
    users = self.content.scan /<span class="at" data-user-id="(\d+?)">/m
    users && users.flatten.uniq.each do |uid|
      self.at_messages << AtMessage.new(user_id: uid, sender_id: self.author_id)
    end
  end
  
  #更新用户分数     -by zjc
  def be_user_score
    #新建message且无parent的为发帖
    if self.parent_id.nil? && !self.board.project.nil?
      UserScore.joint(:post_message, self.author,nil,self, { message_id: self.id })
      update_memo_number(self.author,1)
      if self.board.project_id != -1
        update_memo_number(self.author,2,self.board.project)
      end
    #新建message且有parent的为回帖
    elsif !self.parent_id.nil? && !self.board.project.nil?
      UserScore.joint(:reply_posting, self.author,self.parent.author,self, { message_id: self.id })
      update_replay_for_memo(self.author,1)
      if self.board.project_id != -1
        update_replay_for_memo(self.author,2,self.board.project)
      end
    end
  end

  #减少用户分数
  def down_user_score
    if self.parent_id.nil? && !self.board.project.nil?
      UserScore.joint(:delete_message, self.author,nil,self, { message_id: self.id })
      update_memo_number(User.current,1)
      if self.board.project_id != -1
        update_memo_number(self.author,2,self.board.project)
      end
    elsif !self.parent_id.nil? && !self.board.project.nil?
      UserScore.joint(:reply_deleting, self.author,self.parent.author,self, { message_id: self.id })
      update_replay_for_memo(User.current,1)
      if self.board.project_id != -1
        update_replay_for_memo(self.author,2,self.board.project)
      end
    end
  end

  def send_mail
    Mailer.run.message_posted(self) if Setting.notified_events.include?('message_posted')
  end

  # Time 2015-03-31 09:15:06
  # Author lizanle
  # Description 删除对应消息的图片资源
  def delete_kindeditor_assets
    delete_kindeditor_assets_from_disk self.id,OwnerTypeHelper::MESSAGE
  end

  # 课程成员得分（英雄榜）
  def act_as_student_score
    if self.course
      unless  self.author.allowed_to?(:as_teacher, self.course)
        if self.parent_id.nil?
          # 发帖
          course_member_score(self.course.id, self.author_id, "Message")
        else
          # 回帖
          course_member_score(self.course.id, self.author_id, "MessageReply")
        end
      end
    end
  end
end