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# == Issuable concern
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#
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# Contains common functionality shared between Issues and MergeRequests
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#
# Used by Issue, MergeRequest
#
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module Issuable
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  extend ActiveSupport::Concern
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  include Participable
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  include Mentionable
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  include Subscribable
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  include StripAttribute
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  included do
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    belongs_to :author, class_name: "User"
    belongs_to :assignee, class_name: "User"
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    belongs_to :updated_by, class_name: "User"
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    belongs_to :milestone
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    has_many :notes, as: :noteable, dependent: :destroy
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    has_many :label_links, as: :target, dependent: :destroy
    has_many :labels, through: :label_links
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    has_many :todos, as: :target, dependent: :destroy
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    validates :author, presence: true
    validates :title, presence: true, length: { within: 0..255 }
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    scope :authored, ->(user) { where(author_id: user) }
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    scope :assigned_to, ->(u) { where(assignee_id: u.id)}
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    scope :recent, -> { reorder(id: :desc) }
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    scope :assigned, -> { where("assignee_id IS NOT NULL") }
    scope :unassigned, -> { where("assignee_id IS NULL") }
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    scope :of_projects, ->(ids) { where(project_id: ids) }
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    scope :of_milestones, ->(ids) { where(milestone_id: ids) }
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    scope :opened, -> { with_state(:opened, :reopened) }
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    scope :only_opened, -> { with_state(:opened) }
    scope :only_reopened, -> { with_state(:reopened) }
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    scope :closed, -> { with_state(:closed) }
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    scope :order_milestone_due_desc, -> { outer_join_milestone.reorder('milestones.due_date IS NULL ASC, milestones.due_date DESC, milestones.id DESC') }
    scope :order_milestone_due_asc, -> { outer_join_milestone.reorder('milestones.due_date IS NULL ASC, milestones.due_date ASC, milestones.id ASC') }
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    scope :without_label, -> { joins("LEFT OUTER JOIN label_links ON label_links.target_type = '#{name}' AND label_links.target_id = #{table_name}.id").where(label_links: { id: nil }) }
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    scope :join_project, -> { joins(:project) }
    scope :references_project, -> { references(:project) }
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    scope :non_archived, -> { join_project.where(projects: { archived: false }) }
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    scope :outer_join_milestone, -> { joins("LEFT OUTER JOIN milestones ON milestones.id = #{table_name}.milestone_id") }
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    delegate :name,
             :email,
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             to: :author,
             prefix: true
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    delegate :name,
             :email,
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             to: :assignee,
             allow_nil: true,
             prefix: true
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    attr_mentionable :title, pipeline: :single_line
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    attr_mentionable :description, cache: true
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    participant :author, :assignee, :notes_with_associations
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    strip_attributes :title
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    acts_as_paranoid
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  end

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  module ClassMethods
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    # Searches for records with a matching title.
    #
    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
    #
    # query - The search query as a String
    #
    # Returns an ActiveRecord::Relation.
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    def search(query)
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      where(arel_table[:title].matches("%#{query}%"))
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    end
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    # Searches for records with a matching title or description.
    #
    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
    #
    # query - The search query as a String
    #
    # Returns an ActiveRecord::Relation.
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    def full_search(query)
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      t = arel_table
      pattern = "%#{query}%"

      where(t[:title].matches(pattern).or(t[:description].matches(pattern)))
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    end

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    def sort(method)
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      case method.to_s
      when 'milestone_due_asc' then order_milestone_due_asc
      when 'milestone_due_desc' then order_milestone_due_desc
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      when 'downvotes_desc' then order_downvotes_desc
      when 'upvotes_desc' then order_upvotes_desc
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      else
        order_by(method)
      end
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    end
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    def order_downvotes_desc
      order_votes_desc('thumbsdown')
    end

    def order_upvotes_desc
      order_votes_desc('thumbsup')
    end

    def order_votes_desc(award_emoji_name)
      issuable_table = self.arel_table
      note_table = Note.arel_table

      join_clause = issuable_table.join(note_table, Arel::Nodes::OuterJoin).on(
        note_table[:noteable_id].eq(issuable_table[:id]).and(
          note_table[:noteable_type].eq(self.name).and(
            note_table[:is_award].eq(true).and(note_table[:note].eq(award_emoji_name))
          )
        )
      ).join_sources

      joins(join_clause).group(issuable_table[:id]).reorder("COUNT(notes.id) DESC")
    end
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    def with_label(title)
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      if title.is_a?(Array) && title.size > 1
        joins(:labels).where(labels: { title: title }).group(arel_table[:id]).having("COUNT(DISTINCT labels.title) = #{title.size}")
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      else
        joins(:labels).where(labels: { title: title })
      end
    end
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  end

  def today?
    Date.today == created_at.to_date
  end

  def new?
    today? && created_at == updated_at
  end
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  def is_assigned?
    !!assignee_id
  end

  def is_being_reassigned?
    assignee_id_changed?
  end

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  def open?
    opened? || reopened?
  end

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  def downvotes
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    notes.awards.where(note: "thumbsdown").count
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  end

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  def upvotes
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    notes.awards.where(note: "thumbsup").count
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  end
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  def user_notes_count
    notes.user.count
  end

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  def subscribed_without_subscriptions?(user)
    participants(user).include?(user)
  end

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  def to_hook_data(user)
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    hook_data = {
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      object_kind: self.class.name.underscore,
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      user: user.hook_attrs,
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      project: project.hook_attrs,
      object_attributes: hook_attrs,
      # DEPRECATED
      repository: project.hook_attrs.slice(:name, :url, :description, :homepage)
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    }
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    hook_data.merge!(assignee: assignee.hook_attrs) if assignee

    hook_data
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  end
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  def label_names
    labels.order('title ASC').pluck(:title)
  end

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  def remove_labels
    labels.delete_all
  end

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  def add_labels_by_names(label_names)
    label_names.each do |label_name|
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      label = project.labels.create_with(color: Label::DEFAULT_COLOR).
        find_or_create_by(title: label_name.strip)
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      self.labels << label
    end
  end
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  # Convert this Issuable class name to a format usable by Ability definitions
  #
  # Examples:
  #
  #   issuable.class           # => MergeRequest
  #   issuable.to_ability_name # => "merge_request"
  def to_ability_name
    self.class.to_s.underscore
  end

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  # Returns a Hash of attributes to be used for Twitter card metadata
  def card_attributes
    {
      'Author'   => author.try(:name),
      'Assignee' => assignee.try(:name)
    }
  end

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  def notes_with_associations
    notes.includes(:author, :project)
  end

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  def updated_tasks
    Taskable.get_updated_tasks(old_content: previous_changes['description'].first,
                               new_content: description)
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  end
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  ##
  # Method that checks if issuable can be moved to another project.
  #
  # Should be overridden if issuable can be moved.
  #
  def can_move?(*)
    false
  end
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end