module ActsAsContentHighlightable
  class ContentHighlightsController < ApplicationController
    before_action :set_highlighter_user
    before_action :get_highlightable
    before_action :set_highlightable_column, :only => [:add]

    def add
      if @highlightable.present? and (ContentHighlight.respond_to?(:can_add_highlights?) ? ContentHighlight.can_add_highlights?(@highlightable, @highlighter_user) : true)
        content_highlight = @highlightable.content_highlights.new({
          :user => @highlighter_user,
          :highlightable_column => @highlightable_column,
          :content => params[:content],
          :container_node_identifier_key => params[:common_ancestor_identifier_key],
          :container_node_identifier => params[:common_ancestor_identifier],
          :container_node_type => params[:common_ancestor_node_type],
          :startnode_offset => params[:start_offset],
          :endnode_offset => params[:end_offset],
          :selection_backward => params[:backward]
        })
        content_highlight.save
        show_highlights = ContentHighlight.highlights_to_show(@highlightable, @highlighter_user, {request: request}).enrich_highlights(@highlighter_user)
      else
        show_highlights = Array.new
      end
      render :json => show_highlights.as_json
    end

    def remove
      content_highlight = @highlightable.content_highlights.where(:id => params[:content_highlight_id]).first
      if content_highlight.present? and (content_highlight.respond_to?(:can_remove_highlight?) ? content_highlight.can_remove_highlight?(@highlighter_user) : (content_highlight.user == @highlighter_user))
        remove_highlights = @highlightable.content_highlights.where(:id => content_highlight.id).enrich_highlights(@highlighter_user).as_json
        content_highlight.destroy
      else
        remove_highlights = Array.new
      end
      render :json => remove_highlights
    end

    private

    def set_highlightable_column
      if params[:highlightable_column].blank? and @highlightable.highlightable_columns.size > 1
        raise ArgumentError.new("More than one highlightable column found. Please provide highlightable_column in your parameters")
      elsif params[:highlightable_column].blank?
        @highlightable_column = @highlightable.highlightable_columns.first.to_s
      else
        @highlightable_column = params[:highlightable_column].to_s
      end
      if not @highlightable.respond_to?(:highlightable_columns)
        raise ArgumentError.new("Highlightable column not found. Please check the parameter: highlightable_column")
      end
      if not @highlightable.highlightable_columns.include? @highlightable_column
        raise ArgumentError.new("Invalid Highlightable column")
      end
    end

    def get_highlightable
      highlightable_model = params[:highlightable_type].to_s.constantize
      @highlightable = highlightable_model.respond_to?(:find_by_id) && highlightable_model.find_by_id(params[:highlightable_id])
      @highlightable = nil unless @highlightable.respond_to?(:highlightable_columns)
    end

    def set_highlighter_user
      @highlighter_user ||= (self.respond_to?(:current_user) && self.current_user) || (self.respond_to?(:current_resource_owner, true) && self.send(:current_resource_owner)) || nil
    end
  end
end