module GroceryList

# File lib/grocery_list.rb, line 18
def search_all(items_source, searcher = IGASearcher.new)
  validate_input(items_source, searcher)
  @items = items_from_source(items_source)
  @searcher = searcher
  @items.each do |item|
    # For some odd reason, google chrome (and other browsers?) don't let
    # you open more than three tabs very quickly. So this sleep 0.2 works around
    # it. Not really sure what else I could do. It's ugly but it works...
    sleep 0.2
    @searcher.search(item)
  end
end

# File lib/grocery_list.rb, line 45
def is_valid_source?(items_source)
  @@source_type_tests.values.any? {|f| f.call(items_source)}
end

# File lib/grocery_list.rb, line 37
def items_from_source(items_source)
  @@source_type_tests.each do |key, test|
    if test.call(items_source)
      return @@searchers[key].call(items_source)
    end
  end
end

# File lib/grocery_list.rb, line 32
def validate_input(items_source, searcher)
  raise ArgumentError, "isn't a valid source" unless is_valid_source? items_source
  raise ArgumentError, "searcher isn't a AbstractSearcher" unless searcher.kind_of? AbstractSearcher
end