# == Schema Information
#
# Table name: notes
#
#  id            :integer          not null, primary key
#  note          :text
#  noteable_type :string(255)
#  author_id     :integer
#  created_at    :datetime         not null
#  updated_at    :datetime         not null
#  project_id    :integer
#  attachment    :string(255)
#  line_code     :string(255)
#  commit_id     :string(255)
#  noteable_id   :integer
#

require 'carrierwave/orm/activerecord'
require 'file_size_validator'

class Note < ActiveRecord::Base
  attr_accessible :note, :noteable, :noteable_id, :noteable_type, :project_id,
                  :attachment, :line_code, :commit_id

  belongs_to :project
  belongs_to :noteable, polymorphic: true
  belongs_to :author, class_name: "User"

  delegate :name, to: :project, prefix: true
  delegate :name, :email, to: :author, prefix: true

  validates :note, :project, presence: true
  validates :line_code, format: { with: /\A[a-z0-9]+_\d+_\d+\Z/ }, allow_blank: true
  validates :attachment, file_size: { maximum: 10.megabytes.to_i }

  validates :noteable_id, presence: true, if: ->(n) { n.noteable_type.present? && n.noteable_type != 'Commit' }
  validates :commit_id, presence: true, if: ->(n) { n.noteable_type == 'Commit' }

  mount_uploader :attachment, AttachmentUploader

  # Scopes
  scope :for_commit_id, ->(commit_id) { where(noteable_type: "Commit", commit_id: commit_id) }
  scope :inline, -> { where("line_code IS NOT NULL") }
  scope :not_inline, -> { where("line_code IS NULL") }

  scope :common, ->{ where(noteable_type: ["", nil]) }
  scope :fresh, ->{ order("created_at ASC, id ASC") }
  scope :inc_author_project, ->{ includes(:project, :author) }
  scope :inc_author, ->{ includes(:author) }

  def self.create_status_change_note(noteable, author, status)
    create({
      noteable: noteable,
      project: noteable.project,
      author: author,
      note: "_Status changed to #{status}_"
    }, without_protection: true)
  end

  def commit_author
    @commit_author ||=
      project.users.find_by_email(noteable.author_email) ||
      project.users.find_by_name(noteable.author_name)
  rescue
    nil
  end

  def diff
    if noteable.diffs.present?
      noteable.diffs.select do |d|
        if d.b_path
          Digest::SHA1.hexdigest(d.b_path) == diff_file_index
        end
      end.first
    end
  end

  def diff_file_index
    line_code.split('_')[0]
  end

  def diff_file_name
    diff.b_path
  end

  def diff_new_line
    line_code.split('_')[2].to_i
  end

  def discussion_id
    @discussion_id ||= [:discussion, noteable_type.try(:underscore), noteable_id, line_code].join("-").to_sym
  end

  # Returns true if this is a downvote note,
  # otherwise false is returned
  def downvote?
    votable? && (note.start_with?('-1') ||
                 note.start_with?(':-1:')
                )
  end

  def for_commit?
    noteable_type == "Commit"
  end

  def for_commit_diff_line?
    for_commit? && for_diff_line?
  end

  def for_diff_line?
    line_code.present?
  end

  def for_issue?
    noteable_type == "Issue"
  end

  def for_merge_request?
    noteable_type == "MergeRequest"
  end

  def for_merge_request_diff_line?
    for_merge_request? && for_diff_line?
  end

  def for_wall?
    noteable_type.blank?
  end

  # override to return commits, which are not active record
  def noteable
    if for_commit?
      Commit.new(project.repository.commit(commit_id))
    else
      super
    end
  # Temp fix to prevent app crash
  # if note commit id doesn't exist
  rescue
    nil
  end

  # Returns true if this is an upvote note,
  # otherwise false is returned
  def upvote?
    votable? && (note.start_with?('+1') ||
                 note.start_with?(':+1:')
                )
  end

  def votable?
    for_issue? || (for_merge_request? && !for_diff_line?)
  end

  def noteable_type_name
    if noteable_type.present?
      noteable_type.downcase
    else
      "wall"
    end
  end
end