# frozen_string_literal: true

# name: poll
# about: Official poll plugin for Discourse
# version: 1.0
# authors: Vikhyat Korrapati (vikhyat), Régis Hanol (zogstrip)
# url: https://github.com/discourse/discourse/tree/main/plugins/poll
# transpile_js: true

register_asset "stylesheets/common/poll.scss"
register_asset "stylesheets/desktop/poll.scss", :desktop
register_asset "stylesheets/mobile/poll.scss", :mobile
register_asset "stylesheets/common/poll-ui-builder.scss"
register_asset "stylesheets/desktop/poll-ui-builder.scss", :desktop
register_asset "stylesheets/common/poll-breakdown.scss"

register_svg_icon "far fa-check-square"

enabled_site_setting :poll_enabled
hide_plugin

after_initialize do
  module ::DiscoursePoll
    PLUGIN_NAME ||= "discourse_poll"
    DATA_PREFIX ||= "data-poll-"
    HAS_POLLS ||= "has_polls"
    DEFAULT_POLL_NAME ||= "poll"

    class Engine < ::Rails::Engine
      engine_name PLUGIN_NAME
      isolate_namespace DiscoursePoll
    end

    class Error < StandardError; end
  end

  require_relative "app/controllers/polls_controller.rb"
  require_relative "app/models/poll_option.rb"
  require_relative "app/models/poll_vote.rb"
  require_relative "app/models/poll.rb"
  require_relative "app/serializers/poll_option_serializer.rb"
  require_relative "app/serializers/poll_serializer.rb"
  require_relative "jobs/regular/close_poll.rb"
  require_relative "lib/poll.rb"
  require_relative "lib/polls_updater.rb"
  require_relative "lib/polls_validator.rb"
  require_relative "lib/post_validator.rb"

  DiscoursePoll::Engine.routes.draw do
    put "/vote" => "polls#vote"
    delete "/vote" => "polls#remove_vote"
    put "/toggle_status" => "polls#toggle_status"
    get "/voters" => 'polls#voters'
    get "/grouped_poll_results" => 'polls#grouped_poll_results'
  end

  Discourse::Application.routes.append do
    mount ::DiscoursePoll::Engine, at: "/polls"
  end

  allow_new_queued_post_payload_attribute("is_poll")
  register_post_custom_field_type(DiscoursePoll::HAS_POLLS, :boolean)
  topic_view_post_custom_fields_allowlister { [DiscoursePoll::HAS_POLLS] }

  reloadable_patch do
    Post.class_eval do
      attr_accessor :extracted_polls

      has_many :polls, dependent: :destroy

      after_save do
        polls = self.extracted_polls
        self.extracted_polls = nil
        next if polls.blank? || !polls.is_a?(Hash)
        post = self

        Poll.transaction do
          polls.values.each do |poll|
            DiscoursePoll::Poll.create!(post.id, poll)
          end
          post.custom_fields[DiscoursePoll::HAS_POLLS] = true
          post.save_custom_fields(true)
        end
      end
    end

    User.class_eval do
      has_many :poll_votes, dependent: :delete_all
    end
  end

  validate(:post, :validate_polls) do |force = nil|
    return unless self.raw_changed? || force

    validator = DiscoursePoll::PollsValidator.new(self)
    return unless (polls = validator.validate_polls)

    if polls.present?
      validator = DiscoursePoll::PostValidator.new(self)
      return unless validator.validate_post
    end

    # are we updating a post?
    if self.id.present?
      DiscoursePoll::PollsUpdater.update(self, polls)
    else
      self.extracted_polls = polls
    end

    true
  end

  NewPostManager.add_handler(1) do |manager|
    post = Post.new(raw: manager.args[:raw])

    if !DiscoursePoll::PollsValidator.new(post).validate_polls
      result = NewPostResult.new(:poll, false)

      post.errors.full_messages.each do |message|
        result.add_error(message)
      end

      result
    else
      manager.args["is_poll"] = true
      nil
    end
  end

  on(:approved_post) do |queued_post, created_post|
    if queued_post.payload["is_poll"]
      created_post.validate_polls(true)
    end
  end

  on(:reduce_cooked) do |fragment, post|
    if post.nil? || post.trashed?
      fragment.css(".poll, [data-poll-name]").each(&:remove)
    else
      post_url = post.full_url
      fragment.css(".poll, [data-poll-name]").each do |poll|
        poll.replace "<p><a href='#{post_url}'>#{I18n.t("poll.email.link_to_poll")}</a></p>"
      end
    end
  end

  on(:reduce_excerpt) do |doc, options|
    post = options[:post]

    replacement = post&.url.present? ?
      "<a href='#{UrlHelper.escape_uri(post.url)}'>#{I18n.t("poll.poll")}</a>" :
      I18n.t("poll.poll")

    doc.css("div.poll").each do |poll|
      poll.replace(replacement)
    end
  end

  on(:post_created) do |post, _opts, user|
    guardian = Guardian.new(user)
    DiscoursePoll::Poll.schedule_jobs(post)

    next if post.is_first_post?
    next if post.custom_fields[DiscoursePoll::HAS_POLLS].blank?

    polls = ActiveModel::ArraySerializer.new(post.polls, each_serializer: PollSerializer, root: false, scope: guardian).as_json
    post.publish_message!("/polls/#{post.topic_id}", post_id: post.id, polls: polls)
  end

  on(:merging_users) do |source_user, target_user|
    PollVote.where(user_id: source_user.id).update_all(user_id: target_user.id)
  end

  add_to_class(:topic_view, :polls) do
    @polls ||= begin
      polls = {}

      post_with_polls = @post_custom_fields.each_with_object([]) do |fields, obj|
        obj << fields[0] if fields[1][DiscoursePoll::HAS_POLLS]
      end

      if post_with_polls.present?
        Poll
          .where(post_id: post_with_polls)
          .each do |p|
            polls[p.post_id] ||= []
            polls[p.post_id] << p
          end
      end

      polls
    end
  end

  add_to_serializer(:post, :preloaded_polls, false) do
    @preloaded_polls ||= if @topic_view.present?
      @topic_view.polls[object.id]
    else
      Poll.includes(:poll_options).where(post: object)
    end
  end

  add_to_serializer(:post, :include_preloaded_polls?) do
    false
  end

  add_to_serializer(:post, :polls, false) do
    preloaded_polls.map { |p| PollSerializer.new(p, root: false, scope: self.scope) }
  end

  add_to_serializer(:post, :include_polls?) do
    SiteSetting.poll_enabled && preloaded_polls.present?
  end

  add_to_serializer(:post, :polls_votes, false) do
    preloaded_polls.map do |poll|
      user_poll_votes =
        poll
          .poll_votes
          .where(user_id: scope.user.id)
          .joins(:poll_option)
          .pluck("poll_options.digest")

      [poll.name, user_poll_votes]
    end.to_h
  end

  add_to_serializer(:post, :include_polls_votes?) do
    SiteSetting.poll_enabled &&
    scope.user&.id.present? &&
    preloaded_polls.present? &&
    preloaded_polls.any? { |p| p.has_voted?(scope.user) }
  end
end