class EntertainmentOperations

# File lib/entertainment_operations.rb, line 25
def self.cutLowestRatedHalf(objectArray)
  objectArray = sortByRating(objectArray).reverse
  objectArray.drop(objectArray.length/2)
end

# File lib/entertainment_operations.rb, line 15
def self.getHighestRated(objectArray)
  objectArray = sortByRating(objectArray)
  puts objectArray.last
end

# File lib/entertainment_operations.rb, line 20
def self.getLowestRated(objectArray)
  objectArray = sortByRating(objectArray)
  puts objectArray.first
end

# File lib/entertainment_operations.rb, line 81
def self.printSortedListByCategory(objectArray, categoryNumber)
  objectArray = sortByCategory(objectArray, categoryNumber)
  objectArray.each {|obj| puts obj}
end

# File lib/entertainment_operations.rb, line 64
def self.printSortedListByGenre(objectArray)
  objectArray = sortByGenre(objectArray)
  objectArray.each {|obj| puts obj}
end

# File lib/entertainment_operations.rb, line 30
def self.printSortedListByRating(objectArray)
  objectArray = sortByRating(objectArray)
  objectArray.each {|obj| puts obj}
end

# File lib/entertainment_operations.rb, line 47
def self.printSortedListByTitle(objectArray)
  objectArray = sortByTitle(objectArray)
  objectArray.each {|obj| puts obj}
end

# File lib/entertainment_operations.rb, line 71
def self.sortByCategory(objectArray, categoryNumber)
  # sorts by category alphabetically
  unless defined?(objectArray[categoryNumber].category.first)
    puts "Object must have category array."
    return
  end

  objectArray.sort_by {|m| m.category.first.downcase}
end

# File lib/entertainment_operations.rb, line 54
def self.sortByGenre(objectArray)
  # sorts by genre alphabetically
  unless defined?(objectArray[0].genre)
    puts "Object does not have genre."
    return
  end

  objectArray.sort_by {|m| m.genre.downcase}
end

# File lib/entertainment_operations.rb, line 5
def self.sortByRating(objectArray)
  # sorts in ascending order of rating:
  unless defined?(objectArray[0].rating)
    puts "Object does not have rating."
    return
  end

  objectArray.sort_by {|m| m.rating}
end

# File lib/entertainment_operations.rb, line 37
def self.sortByTitle(objectArray)
  # sorts by name alphabetically
  unless defined?(objectArray[0].title)
    puts "Object does not have title."
    return
  end

  objectArray.sort_by {|m| m.title.downcase}
end