# frozen_string_literal: true

namespace :vns do
  desc 'Benchmarks the efficiency of the VNS implementation'
  task benchmark: :environment do
    ActsAsTenant.with_tenant(Wedding.first) do
      Rails.logger.info "There are #{Guest.potential.count} potential guests"

      engine = VNS::Engine.new

      engine.add_perturbation(Tables::Swap)
      engine.add_perturbation(Tables::Shift)

      hierarchy = AffinityGroupsHierarchy.new
      initial_solution = Tables::Distribution.new(min_per_table: 8, max_per_table: 10, hierarchy:)

      random = Random.new(561_163)
      initial_solution.random_distribution(Guest.potential.shuffle(random:), random:)

      engine.initial_solution = initial_solution

      engine.target_function(&:discomfort)

      solution = Rails.benchmark('VNS Benchmarking') { engine.run }

      Rails.logger.info "Best solution found with discomfort: #{solution.discomfort}"
    end
  end
end