require 'abstract_unit'

module ActionDispatch
  module Journey
    module GTG
      class TestBuilder < ActiveSupport::TestCase
        def test_following_states_multi
          table  = tt ['a|a']
          assert_equal 1, table.move([0], 'a').length
        end

        def test_following_states_multi_regexp
          table  = tt [':a|b']
          assert_equal 1, table.move([0], 'fooo').length
          assert_equal 2, table.move([0], 'b').length
        end

        def test_multi_path
          table  = tt ['/:a/d', '/b/c']

          [
            [1, '/'],
            [2, 'b'],
            [2, '/'],
            [1, 'c'],
          ].inject([0]) { |state, (exp, sym)|
            new = table.move(state, sym)
            assert_equal exp, new.length
            new
          }
        end

        def test_match_data_ambiguous
          table = tt %w{
            /articles(.:format)
            /articles/new(.:format)
            /articles/:id/edit(.:format)
            /articles/:id(.:format)
          }

          sim     = NFA::Simulator.new table

          match = sim.match '/articles/new'
          assert_equal 2, match.memos.length
        end

        ##
        # Identical Routes may have different restrictions.
        def test_match_same_paths
          table = tt %w{
            /articles/new(.:format)
            /articles/new(.:format)
          }

          sim     = NFA::Simulator.new table

          match = sim.match '/articles/new'
          assert_equal 2, match.memos.length
        end

        private
        def ast strings
          parser = Journey::Parser.new
          asts   = strings.map { |string|
            memo = Object.new
            ast  = parser.parse string
            ast.each { |n| n.memo = memo }
            ast
          }
          Nodes::Or.new asts
        end

        def tt strings
          Builder.new(ast(strings)).transition_table
        end
      end
    end
  end
end