# Copyright (C) 2012-2021 Zammad Foundation, http://zammad-foundation.org/

class Chat::Session < ApplicationModel
  include HasSearchIndexBackend
  include HasTags

  include Chat::Session::Search
  include Chat::Session::SearchIndex
  include Chat::Session::Assets

  # rubocop:disable Rails/InverseOf
  has_many   :messages, class_name: 'Chat::Message', foreign_key: 'chat_session_id', dependent: :destroy
  belongs_to :user,     class_name: 'User', optional: true
  belongs_to :chat,     class_name: 'Chat'
  # rubocop:enable Rails/InverseOf

  before_create :generate_session_id

  store :preferences

  def agent_user
    return if user_id.blank?

    user = User.lookup(id: user_id)
    return if user.blank?

    fullname = user.fullname
    chat_preferences = user.preferences[:chat] || {}
    if chat_preferences[:alternative_name].present?
      fullname = chat_preferences[:alternative_name]
    end
    url = nil
    if user.image && user.image != 'none' && chat_preferences[:avatar_state] != 'disabled'
      url = "#{Setting.get('http_type')}://#{Setting.get('fqdn')}/api/v1/users/image/#{user.image}"
    end
    {
      name:   fullname,
      avatar: url,
    }
  end

  def generate_session_id
    self.session_id = Digest::MD5.hexdigest(SecureRandom.uuid)
  end

  def add_recipient(client_id, store = false)
    if !preferences[:participants]
      preferences[:participants] = []
    end
    return preferences[:participants] if preferences[:participants].include?(client_id)

    preferences[:participants].push client_id
    if store
      save
    end
    preferences[:participants]
  end

  def recipients_active?
    return true if !preferences
    return true if !preferences[:participants]

    count = 0
    preferences[:participants].each do |client_id|
      next if !Sessions.session_exists?(client_id)

      count += 1
    end
    return true if count >= 2

    false
  end

  def send_to_recipients(message, ignore_client_id = nil)
    preferences[:participants].each do |local_client_id|
      next if local_client_id == ignore_client_id

      Sessions.send(local_client_id, message)
    end
    true
  end

  def position
    return if state != 'waiting'

    position = 0
    Chat::Session.where(state: 'waiting').order(created_at: :asc).each do |chat_session|
      position += 1
      break if chat_session.id == id
    end
    position
  end

  def self.messages_by_session_id(session_id)
    chat_session = Chat::Session.find_by(session_id: session_id)
    return if !chat_session

    session_attributes = []
    Chat::Message.where(chat_session_id: chat_session.id).order(created_at: :asc).each do |message|
      session_attributes.push message.attributes
    end
    session_attributes
  end

  def self.active_chats_by_user_id(user_id)
    actice_sessions = []
    Chat::Session.where(state: 'running', user_id: user_id).order(created_at: :asc).each do |session|
      session_attributes = session.attributes
      session_attributes['messages'] = []
      Chat::Message.where(chat_session_id: session.id).order(created_at: :asc).each do |message|
        session_attributes['messages'].push message.attributes
      end
      actice_sessions.push session_attributes
    end
    actice_sessions
  end
end