require "abstract_unit"

module ActionDispatch
  module Journey
    module NFA
      class TestSimulator < ActiveSupport::TestCase
        def test_simulate_simple
          sim = simulator_for ["/foo"]
          assert_match sim, "/foo"
        end

        def test_simulate_simple_no_match
          sim = simulator_for ["/foo"]
          assert_no_match sim, "foo"
        end

        def test_simulate_simple_no_match_too_long
          sim = simulator_for ["/foo"]
          assert_no_match sim, "/foo/bar"
        end

        def test_simulate_simple_no_match_wrong_string
          sim = simulator_for ["/foo"]
          assert_no_match sim, "/bar"
        end

        def test_simulate_regex
          sim = simulator_for ["/:foo/bar"]
          assert_match sim, "/bar/bar"
          assert_match sim, "/foo/bar"
        end

        def test_simulate_or
          sim = simulator_for ["/foo", "/bar"]
          assert_match sim, "/bar"
          assert_match sim, "/foo"
          assert_no_match sim, "/baz"
        end

        def test_simulate_optional
          sim = simulator_for ["/foo(/bar)"]
          assert_match sim, "/foo"
          assert_match sim, "/foo/bar"
          assert_no_match sim, "/foo/"
        end

        def test_matchdata_has_memos
          paths   = %w{ /foo /bar }
          parser  = Journey::Parser.new
          asts    = paths.map { |x|
            ast = parser.parse x
            ast.each { |n| n.memo = ast }
            ast
          }

          expected = asts.first

          builder = Builder.new Nodes::Or.new asts

          sim = Simulator.new builder.transition_table

          md = sim.match "/foo"
          assert_equal [expected], md.memos
        end

        def test_matchdata_memos_on_merge
          parser = Journey::Parser.new
          routes = [
            "/articles(.:format)",
            "/articles/new(.:format)",
            "/articles/:id/edit(.:format)",
            "/articles/:id(.:format)",
          ].map { |path|
            ast = parser.parse path
            ast.each { |n| n.memo = ast }
            ast
          }

          asts = routes.dup

          ast = Nodes::Or.new routes

          nfa = Journey::NFA::Builder.new ast
          sim = Simulator.new nfa.transition_table
          md = sim.match "/articles"
          assert_equal [asts.first], md.memos
        end

        def simulator_for(paths)
          parser  = Journey::Parser.new
          asts    = paths.map { |x| parser.parse x }
          builder = Builder.new Nodes::Or.new asts
          Simulator.new builder.transition_table
        end
      end
    end
  end
end