# frozen_string_literal: true

module Experiments
  class MoveToProjectService
    extend Service

    attr_reader :errors

    def initialize(experiment_id:, project_id:, user_id:)
      @exp = Experiment.find experiment_id
      @project = Project.find project_id
      @user = User.find user_id
      @original_project = @exp&.project
      @errors = {}
    end

    def call
      return self unless valid?

      ActiveRecord::Base.transaction do
        @exp.project = @project

        @exp.my_modules.each do |my_module|
          sync_user_assignments(my_module)
          new_tags = []
          my_module.tags.each do |tag|
            new_tag = @project.tags.where.not(id: new_tags).find_by(name: tag.name, color: tag.color)
            new_tag ||=
              @project.tags.create!(name: tag.name, color: tag.color, created_by: @user, last_modified_by: @user)
            new_tags << new_tag
          end
          my_module.tags.destroy_all
          my_module.tags = new_tags
        end

        @exp.save!
        sync_user_assignments(@exp)
      rescue
        @errors.merge!(@exp.errors.to_hash) unless @exp.valid?
        raise ActiveRecord::Rollback
      end

      track_activity if succeed?
      self
    end

    def succeed?
      @errors.none?
    end

    private

    def valid?
      unless @exp && @project && @user
        @errors[:invalid_arguments] =
          { 'experiment': @exp,
            'project': @project,
            'user': @user }
          .map do |key, value|
            "Can't find #{key.capitalize}" if value.nil?
          end.compact
        return false
      end

      if !@exp.moveable_projects(@user).include?(@project)
        @errors[:target_project_not_valid] =
          ['Experiment cannot be moved to this project']
        false
      else
        true
      end
    end

    def sync_user_assignments(object)
      # remove user assignments where the user are not present on the project
      object.user_assignments.destroy_all

      UserAssignments::GenerateUserAssignmentsJob.perform_later(object, @user)
    end

    def track_activity
      Activities::CreateActivityService
        .call(activity_type: :move_experiment,
              owner: @user,
              team: @project.team,
              project: @project,
              subject: @exp,
              message_items: { experiment: @exp.id,
                               project_new: @project.id,
                               project_original: @original_project.id })

    end
  end
end