# == Schema Information
#
# Table name: services
#
#  id         :integer          not null, primary key
#  type       :string(255)
#  title      :string(255)
#  project_id :integer
#  created_at :datetime
#  updated_at :datetime
#  active     :boolean          default(FALSE), not null
#  properties :text
#  template   :boolean          default(FALSE)
#  push_events           :boolean          default(TRUE)
#  issues_events         :boolean          default(TRUE)
#  merge_requests_events :boolean          default(TRUE)
#  tag_push_events       :boolean          default(TRUE)
#
require "slack_messages/slack_issue_message"
require "slack_messages/slack_push_message"
require "slack_messages/slack_merge_message"

class SlackService < Service
  prop_accessor :webhook, :username, :channel
  validates :webhook, presence: true, if: :activated?

  def title
    'Slack'
  end

  def description
    'A team communication tool for the 21st century'
  end

  def to_param
    'slack'
  end

  def fields
    [
      { type: 'text', name: 'webhook',
        placeholder: 'https://hooks.slack.com/services/...' },
      { type: 'text', name: 'username', placeholder: 'username' },
      { type: 'text', name: 'channel', placeholder: '#channel' }
    ]
  end

  def execute(data)
    return unless webhook.present?

    object_kind = data[:object_kind]

    data = data.merge(
      project_url: project_url,
      project_name: project_name
    )

    # WebHook events often have an 'update' event that follows a 'open' or
    # 'close' action. Ignore update events for now to prevent duplicate
    # messages from arriving.

    message = case object_kind
    when "push"
      message = SlackMessages::SlackPushMessage.new(data)
    when "issue"
      message = SlackMessages::SlackIssueMessage.new(data) unless is_update?(data)
    when "merge_request"
      message = SlackMessages::SlackMergeMessage.new(data) unless is_update?(data)
    end

    opt = {}
    opt[:channel] = channel if channel
    opt[:username] = username if username

    if message
      notifier = Slack::Notifier.new(webhook, opt)
      notifier.ping(message.pretext, attachments: message.attachments)
    end
  end

  private

  def project_name
    project.name_with_namespace.gsub(/\s/, '')
  end

  def project_url
    project.web_url
  end

  def is_update?(data)
    data[:object_attributes][:action] == 'update'
  end
end