require 'benchmark'
require 'set'
require 'assert/assert_runner'
require 'assert/version'

module Assert

  class CLI

    def self.debug?(args)
      args.include?('-d') || args.include?('--debug')
    end

    def self.debug_msg(msg)
      "[DEBUG] #{msg}"
    end

    def self.debug_start_msg(msg)
      debug_msg("#{msg}...".ljust(30))
    end

    def self.debug_finish_msg(time_in_ms)
      " (#{time_in_ms} ms)"
    end

    def self.bench(start_msg, &block)
      if !Assert.config.debug
        block.call; return
      end
      print debug_start_msg(start_msg)
      RoundedMillisecondTime.new(Benchmark.measure(&block).real).tap do |time_in_ms|
        puts debug_finish_msg(time_in_ms)
      end
    end

    def initialize(*args)
      @args = args
      @cli = CLIRB.new do
        option 'runner_seed', 'use a given seed to run tests', {
          :abbrev => 's', :value => Fixnum
        }
        option 'changed_only', 'only run test files with changes', {
          :abbrev => 'c'
        }
        option 'changed_ref', 'reference for changes, use with `-c` opt', {
          :abbrev => 'r', :value => ''
        }
        option 'single_test', 'only run the test on the given file/line', {
          :abbrev => 't', :value => ''
        }
        option 'pp_objects', 'pretty-print objects in fail messages', {
          :abbrev => 'p'
        }
        option 'capture_output', 'capture stdout and display in result details', {
          :abbrev => 'o'
        }
        option 'halt_on_fail', 'halt a test when it fails', {
          :abbrev => 'h'
        }
        option 'profile', 'output test profile info', {
          :abbrev => 'e'
        }
        option 'verbose', 'output verbose runtime test info', {
          :abbrev => 'v'
        }
        option 'list', 'list test files on $stdout', {
          :abbrev => 'l'
        }
        # show loaded test files, cli err backtraces, etc
        option 'debug', 'run in debug mode', {
          :abbrev => 'd'
        }
      end
    end

    def run
      begin
        @cli.parse!(@args)
        catch(:halt) do
          Assert::AssertRunner.new(Assert.config, @cli.args, @cli.opts).run
        end
      rescue CLIRB::HelpExit
        puts help
      rescue CLIRB::VersionExit
        puts Assert::VERSION
      rescue CLIRB::Error => exception
        puts "#{exception.message}\n\n"
        puts  Assert.config.debug ? exception.backtrace.join("\n") : help
        exit(1)
      rescue StandardError => exception
        puts "#{exception.class}: #{exception.message}"
        puts exception.backtrace.join("\n")
        exit(1)
      end
      exit(0)
    end

    def help
      "Usage: assert [options] [TESTS]\n\n"\
      "Options:"\
      "#{@cli}"
    end

  end

  module RoundedMillisecondTime
    ROUND_PRECISION = 3
    ROUND_MODIFIER = 10 ** ROUND_PRECISION
    def self.new(time_in_seconds)
      (time_in_seconds * 1000 * ROUND_MODIFIER).to_i / ROUND_MODIFIER.to_f
    end
  end

  class CLIRB  # Version 1.0.0, https://github.com/redding/cli.rb
    Error    = Class.new(RuntimeError);
    HelpExit = Class.new(RuntimeError); VersionExit = Class.new(RuntimeError)
    attr_reader :argv, :args, :opts, :data

    def initialize(&block)
      @options = []; instance_eval(&block) if block
      require 'optparse'
      @data, @args, @opts = [], [], {}; @parser = OptionParser.new do |p|
        p.banner = ''; @options.each do |o|
          @opts[o.name] = o.value; p.on(*o.parser_args){ |v| @opts[o.name] = v }
        end
        p.on_tail('--version', ''){ |v| raise VersionExit, v.to_s }
        p.on_tail('--help',    ''){ |v| raise HelpExit,    v.to_s }
      end
    end

    def option(*args); @options << Option.new(*args); end
    def parse!(argv)
      @args = (argv || []).dup.tap do |args_list|
        begin; @parser.parse!(args_list)
        rescue OptionParser::ParseError => err; raise Error, err.message; end
      end; @data = @args + [@opts]
    end
    def to_s; @parser.to_s; end
    def inspect
      "#<#{self.class}:#{'0x0%x' % (object_id << 1)} @data=#{@data.inspect}>"
    end

    class Option
      attr_reader :name, :opt_name, :desc, :abbrev, :value, :klass, :parser_args

      def initialize(name, *args)
        settings, @desc = args.last.kind_of?(::Hash) ? args.pop : {}, args.pop || ''
        @name, @opt_name, @abbrev = parse_name_values(name, settings[:abbrev])
        @value, @klass = gvalinfo(settings[:value])
        @parser_args = if [TrueClass, FalseClass, NilClass].include?(@klass)
          ["-#{@abbrev}", "--[no-]#{@opt_name}", @desc]
        else
          ["-#{@abbrev}", "--#{@opt_name} #{@opt_name.upcase}", @klass, @desc]
        end
      end

      private

      def parse_name_values(name, custom_abbrev)
        [ (processed_name = name.to_s.strip.downcase), processed_name.gsub('_', '-'),
          custom_abbrev || processed_name.gsub(/[^a-z]/, '').chars.first || 'a'
        ]
      end
      def gvalinfo(v); v.kind_of?(Class) ? [nil,gklass(v)] : [v,gklass(v.class)]; end
      def gklass(k); k == Fixnum ? Integer : k; end
    end
  end

end