# frozen_string_literal: true

class MetacodeSetsController < ApplicationController
  include MetacodesHelper
  before_action :require_admin, except: :index

  # GET /metacode_sets
  # GET /metacode_sets.json
  def index
    @metacode_sets = MetacodeSet.order('name').all

    respond_to do |format|
      format.json { render json: metacode_sets_json }
    end
  end

  # POST /metacode_sets
  # POST /metacode_sets.json
  def create
    @user = current_user
    @metacode_set = MetacodeSet.new(metacode_set_params)
    @metacode_set.user_id = @user.id

    respond_to do |format|
      if @metacode_set.save
        # create the InMetacodeSet for all the metacodes that were selected for the set
        @metacodes = params[:metacodes][:value].split(',')
        @metacodes.each do |m|
          InMetacodeSet.create(metacode_id: m, metacode_set_id: @metacode_set.id)
        end
        format.json do
          render json: @metacode_set, status: :created, location: metacode_sets_url
        end
      else
        format.json { render json: @metacode_set.errors, status: :unprocessable_entity }
      end
    end
  end

  # PUT /metacode_sets/1
  # PUT /metacode_sets/1.json
  def update
    @metacode_set = MetacodeSet.find(params[:id])

    respond_to do |format|
      if @metacode_set.update_attributes(metacode_set_params)

        # build an array of the IDs of the metacodes currently in the set
        current_metacodes = @metacode_set.metacodes.map { |m| m.id.to_s }
        # get the list of desired metacodes for the set from the user input and build an array out of it
        new_metacodes = params[:metacodes][:value].split(',')

        # remove the metacodes that were in it, but now aren't
        removed_metacodes = current_metacodes - new_metacodes
        removed_metacodes.each do |m|
          inmetacodeset = InMetacodeSet.find_by(metacode_id: m, metacode_set_id: @metacode_set.id)
          inmetacodeset.destroy
        end

        # add the new metacodes
        added_metacodes = new_metacodes - current_metacodes
        added_metacodes.each do |m|
          InMetacodeSet.create(metacode_id: m, metacode_set_id: @metacode_set.id)
        end

        format.json { head :no_content }
      else
        format.json { render json: @metacode_set.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /metacode_sets/1
  # DELETE /metacode_sets/1.json
  def destroy
    @metacode_set = MetacodeSet.find(params[:id])

    # delete everything that tracks what's in the set
    @metacode_set.in_metacode_sets.each(&:destroy)

    @metacode_set.destroy

    respond_to do |format|
      format.json { head :no_content }
    end
  end

  private

  def metacode_set_params
    params.require(:metacode_set).permit(:desc, :mapperContributed, :name)
  end
end