# frozen_string_literal: true

require 'uri'

module Integrations
  class Irker < Integration
    validates :recipients, presence: true, if: :validate_recipients?
    before_validation :get_channels

    field :server_host,
      placeholder: 'localhost',
      title: -> { s_('IrkerService|Server host (optional)') },
      help: -> { s_('IrkerService|irker daemon hostname (defaults to localhost).') }

    field :server_port,
      placeholder: 6659,
      title: -> { s_('IrkerService|Server port (optional)') },
      help: -> { s_('IrkerService|irker daemon port (defaults to 6659).') }

    field :default_irc_uri,
      title: -> { s_('IrkerService|Default IRC URI (optional)') },
      help: -> { s_('IrkerService|URI to add before each recipient.') },
      placeholder: 'irc://irc.network.net:6697/'

    field :recipients,
      type: 'textarea',
      title: -> { s_('IrkerService|Recipients') },
      placeholder: 'irc[s]://irc.network.net[:port]/#channel',
      required: true,
      help: -> do
        recipients_docs_link = ActionController::Base.helpers.link_to(
          s_('IrkerService|How to enter channels or users?'),
          Rails.application.routes.url_helpers.help_page_url(
            'user/project/integrations/irker',
            anchor: 'enter-irker-recipients'
          ),
          target: '_blank', rel: 'noopener noreferrer'
        )

        ERB::Util.html_escape(
          s_('IrkerService|Channels and users separated by whitespaces. %{recipients_docs_link}')
        ) % {
          recipients_docs_link: recipients_docs_link.html_safe
        }
      end

    field :colorize_messages,
      type: 'checkbox',
      title: -> { _('Colorize messages') }

    # NOTE: This field is only used internally to store the parsed
    # channels from the `recipients` field, it should not be exposed
    # in the UI or API.
    prop_accessor :channels

    def title
      s_('IrkerService|irker (IRC gateway)')
    end

    def description
      s_('IrkerService|Send update messages to an irker server.')
    end

    def self.to_param
      'irker'
    end

    def self.supported_events
      %w[push]
    end

    def execute(data)
      return unless supported_events.include?(data[:object_kind])

      Integrations::IrkerWorker.perform_async(
        project_id, channels,
        colorize_messages, data, settings
      )
    end

    def settings
      {
        server_host: server_host.presence || 'localhost',
        server_port: server_port.presence || 6659
      }
    end

    def help
      docs_link = ActionController::Base.helpers.link_to(
        _('Learn more.'),
        Rails.application.routes.url_helpers.help_page_url(
          'user/project/integrations/irker',
          anchor: 'set-up-an-irker-daemon'
        ),
        target: '_blank',
        rel: 'noopener noreferrer'
      )

      format(s_(
        'IrkerService|Send update messages to an irker server. ' \
        'Before you can use this, you need to set up the irker daemon. %{docs_link}'
      ).html_safe, docs_link: docs_link.html_safe)
    end

    private

    def get_channels
      return true unless activated?
      return true if recipients.nil? || recipients.empty?

      map_recipients

      errors.add(:recipients, 'are all invalid') if channels.empty?
      true
    end

    def map_recipients
      self.channels = recipients.split(/\s+/).map do |recipient|
        format_channel(recipient)
      end
      channels.reject!(&:nil?)
    end

    def format_channel(recipient)
      uri = nil

      # Try to parse the chan as a full URI
      begin
        uri = consider_uri(URI.parse(recipient))
      rescue URI::InvalidURIError
      end

      unless uri.present? && default_irc_uri.nil?
        begin
          new_recipient = URI.join(default_irc_uri, '/', recipient).to_s
          uri = consider_uri(URI.parse(new_recipient))
        rescue StandardError
          log_error("Unable to create a valid URL", default_irc_uri: default_irc_uri, recipient: recipient)
        end
      end

      uri
    end

    def consider_uri(uri)
      return unless uri.is_a?(URI) && uri.scheme.present?
      # Authorize both irc://domain.com/#chan and irc://domain.com/chan
      return unless uri.scheme =~ /\Aircs?\z/ && !uri.path.nil?

      uri.to_s
    end
  end
end