require 'flag_query'

class Admin::FlagsController < Admin::AdminController

  def self.flags_per_page
    10
  end

  def index
    Discourse.deprecate("FlagsController#index has been deprecated, please use the Reviewable API instead", since: "2.3.0beta5", drop_from: "2.4")

    offset = params[:offset].to_i
    per_page = Admin::FlagsController.flags_per_page

    posts, topics, users, post_actions, total_rows = FlagQuery.flagged_posts_report(
      current_user,
      filter: params[:filter],
      user_id: params[:user_id],
      offset: offset,
      topic_id: params[:topic_id],
      per_page: per_page
    )

    meta = {
      types: {
        disposed_by: 'user'
      }
    }

    next_segment = offset + per_page
    if (total_rows || 0) > next_segment
      meta[:total_rows_flagged_posts] = total_rows
      meta[:load_more_flagged_posts] = admin_flags_filtered_path(
        filter: params[:filter],
        offset: next_segment,
        topic_id: params[:topic_id]
      )
    end

    render_json_dump(
      {
        flagged_posts: posts,
        topics: serialize_data(topics, FlaggedTopicSerializer),
        users: serialize_data(users, FlaggedUserSerializer),
        post_actions: post_actions
      },
      rest_serializer: true,
      meta: meta
    )
  end

  def agree
    Discourse.deprecate("FlagsController#agree has been deprecated, please use the Reviewable API instead", since: "2.3.0beta5", drop_from: "2.4")

    params.permit(:id, :action_on_post)
    post = Post.find(params[:id])

    DiscourseEvent.trigger(
      :before_staff_flag_action,
      type: 'agree',
      post: post,
      action_on_post: params[:action_on_post],
      user: current_user
    )

    reviewable = post.reviewable_flag
    return render_json_error(I18n.t("flags.errors.already_handled"), status: 409) if reviewable.blank?

    keep_post = ['silenced', 'suspended', 'keep'].include?(params[:action_on_post])
    delete_post = params[:action_on_post] == "delete"
    restore_post = params[:action_on_post] == "restore"

    if delete_post
      # PostDestroy automatically agrees with flags
      destroy_post(post)
    elsif restore_post
      reviewable.perform(current_user, :agree_and_restore)
    else
      reviewable.perform(
        current_user,
        :agree_and_keep,
        post_was_deleted: delete_post,
        hide_post: !keep_post
      )
    end

    render body: nil
  end

  def disagree
    Discourse.deprecate("FlagsController#disagree has been deprecated, please use the Reviewable API instead", since: "2.3.0beta5", drop_from: "2.4")
    params.permit(:id)
    post = Post.find(params[:id])

    if reviewable = post.reviewable_flag
      DiscourseEvent.trigger(
        :before_staff_flag_action,
        type: 'disagree',
        post: post,
        user: current_user
      )

      if post.hidden?
        reviewable.perform(current_user, :disagree_and_restore)
      else
        reviewable.perform(current_user, :disagree)
      end
    end

    render body: nil
  end

  def defer
    Discourse.deprecate("FlagsController#defer has been deprecated, please use the Reviewable API instead", since: "2.3.0beta5", drop_from: "2.4")

    params.permit(:id, :delete_post)
    post = Post.find(params[:id])

    if reviewable = post.reviewable_flag
      DiscourseEvent.trigger(
        :before_staff_flag_action,
        type: 'defer',
        post: post,
        user: current_user
      )

      reviewable.perform(current_user, :ignore, post_was_deleted: params[:delete_post])
      destroy_post(post) if params[:delete_post]
    end

    render body: nil
  end

  private

  def destroy_post(post)
    if post.is_first_post?
      topic = Topic.find_by(id: post.topic_id)
      guardian.ensure_can_delete!(topic) if topic.present?
    end

    PostDestroyer.new(current_user, post).destroy
  end
end