module AlgorithmDemo

# File lib/modules/topics/demos/algorithm_demo.rb, line 48
def self.run
  n = 3000

  movies = AlgorithmDemo::Helpers.generate_movies_list_of_size(n)
  AlgorithmDemo::Helpers.sort_all_movies
  hash = AlgorithmDemo::Helpers.generate_hash_for_movies(movies)
  treemap = AlgorithmDemo::Helpers.generate_treemap_for_movies(movies)

  sample_key = Movie.all[-1].clone.title
  sample_value = Movie.all[-1].clone.description

  puts "Please wait, processing Big-O Benchmarks..."
  spinner = Utils::Spinner.new
  threads = []
  # Ruby Threads - https://ruby-doc.org/core-2.4.2/Thread.html
  spinner_thread = Thread.start { AlgorithmDemo.run_spinner(spinner) }
  benchmarking_thread = Thread.start {
    # O(1) - Benchmark Search/Lookup
    # References:
    #  - https://ruby-doc.org/stdlib-2.4.2/libdoc/benchmark/rdoc/Benchmark.html
    #  - https://stackoverflow.com/questions/1592649/examples-of-algorithms-which-has-o1-on-log-n-and-olog-n-complexities
    Benchmark.bm do |x|
      x.report { treemap.get(sample_key) } # RubyRBTreeMap
      x.report { hash[sample_key] } # Hash
    end

    # O(n) - Benchmark Delete
    Benchmark.bm do |x|
      x.report { treemap.delete(sample_key) } # RubyRBTreeMap
      x.report { hash.delete(sample_key) } # Hash
    end

    # O(n^2) - Benchmark Sort
    Benchmark.bm do |x|
      x.report { Algorithms::Sort.bubble_sort Movie.all } # Bubble Sort
      x.report { Movie.all.sort } # Object
    end

    # Stop spinner rotating
    spinner.stop_processing

    # Kill spinner thread
    Thread.kill(spinner_thread)
  }
  threads << spinner_thread
  threads << benchmarking_thread
  threads.each { |thread| thread.join }
  # AlgorithmDemo.show_status_of_threads(threads)
end

# File lib/modules/topics/demos/algorithm_demo.rb, line 38
def self.run_spinner(spinner)
  spinner.start_processing
end

# File lib/modules/topics/demos/algorithm_demo.rb, line 42
def self.show_status_of_threads(threads)
  threads.each_with_index { |thread, index|
    puts "Thread #{index} status: #{thread.status ? 'OPEN' : 'CLOSED'}"
  }
end