module Pork
  Report = Struct.new(:io)

  module Report::Imp
    def initialize o=$stdout
      super
      extend(*Pork.report_extensions.reverse) if Pork.report_extensions.any?
    end

    def case_start _; end
    def case_end    ; end
    def case_pass   ; io.print msg_pass   ; end
    def case_skip   ; io.print msg_skip   ; end
    def case_failed ; io.print msg_failed ; end
    def case_errored; io.print msg_errored; end

    def loaded at, files
      elapsed = Time.now - at
      delta = $LOADED_FEATURES.size - files
      io.printf("Loaded %s files in %s seconds, %s files/s\n",
                *loadings([delta, elapsed.round(6),
                           (delta / elapsed).round(4)]))
      io.puts
    end

    def prepare paths
    end

    def report stat
      io.puts
      io.puts messages(stat)
      io.printf("\nFinished in %s seconds, %s tests/s, %s assertions/s \n",
                *velocity(stat.velocity))
      io.printf("%s tests, %s assertions, %s failures, %s errors, %s skips\n",
                *numbers(stat.numbers))
    end

    private
    def loadings values
      values
    end

    def velocity values
      values
    end

    def numbers values
      values
    end

    def ok text
      text
    end

    def bad text
      text
    end

    def time text
      text
    end

    def messages stat
      stat.exceptions.reverse_each.map do |(err, msg, test, seed)|
        "\n  #{show_command(test.source_location, seed)}" \
        "\n  #{show_backtrace(test, err)}"                \
        "#{show_source(test, err)}"                       \
        "\n#{show_message(msg)}"                          \
        "\n#{show_exception(err)}"
      end
    end

    def show_command source_location, seed
      "Replicate this test with:\n#{command(source_location, seed)}"
    end

    def command source_location, seed
      "env#{pork_test(source_location)} #{pork_mode} #{pork_seed(seed)}" \
      " #{Gem.ruby} -S #{$0} #{ARGV.join(' ')}"
    end

    def show_backtrace test, err
      backtrace(test, err).join("\n  ")
    end

    def backtrace test, err
      if $VERBOSE
        err.backtrace
      else
        strip(reject_pork(test, err))
      end
    end

    def show_source _, _
      ''
    end

    def highlight_line line
      line
    end

    def backlight_line line
      line
    end

    def show_message msg
      msg
    end

    def show_exception err
      "#{err.class}: #{err.message}"
    end

    def reject_pork test, err
      bt = err.backtrace.reject{ |l| l =~ %r{/lib/pork(/\w+)*\.rb:\d+} }
      if bt.empty?
        ["#{test.source_location.join(':')}:in `block in would'"]
      else
        bt
      end
    end

    def strip bt
      strip_home(strip_cwd(bt))
    end

    def strip_home bt
      bt.map{ |path| path.sub(ENV['HOME'], '~') }
    end

    def strip_cwd bt
      bt.map{ |path| path.sub("#{Dir.pwd}/", '') }
    end

    def pork_test source_location
      if !!ENV['PORK_SEED'] == !!ENV['PORK_TEST'] || ENV['PORK_TEST']
        file, line = source_location
        " PORK_TEST='#{strip([file]).join}:#{line}'"
      else
        # cannot replicate a test case with PORK_SEED set and PORK_TEST unset
        # unless we could restore random's state (srand didn't work for that)
      end
    end

    def pork_mode
      "PORK_MODE=#{Pork.execute_mode}"
    end

    def pork_seed seed
      "PORK_SEED=#{seed}"
    end
  end

  Report.__send__(:include, Report::Imp)
end