#!/usr/bin/env ruby
$:.unshift File.expand_path('../lib', __dir__)

require 'benchmark_driver'
require 'optparse'
require 'shellwords'
require 'yaml'

# Parse command line options
config = BenchmarkDriver::Config.new.tap do |c|
  executables = []
  bundler = false
  timeout = false

  parser = OptionParser.new do |o|
    o.version = BenchmarkDriver::VERSION
    o.banner = "Usage: #{File.basename($0, '.*')} [options] RUBY|YAML..."
    o.on('-r', '--runner TYPE', String, 'Specify runner type: ips, time, memory, once, block (default: ips)') do |d|
      c.runner_type = d
    end
    o.on('-o', '--output TYPE', String, 'Specify output type: compare, simple, markdown, record (default: compare)') do |out|
      c.output_type = out
      begin
        plugin_options = BenchmarkDriver::Output.get(out).const_get('OPTIONS', false)
      rescue ArgumentError, LoadError, NameError
      else
        plugin_options.each do |name, args|
          unless args.first.start_with?('--output-')
            raise ArgumentError.new("#{args.first.dump} must start with '--output-'")
          end
          o.on(*args) do |opt|
            c.output_opts[name] = opt
          end
        end
      end
    end
    o.on('-e', '--executables EXECS', String, 'Ruby executables (e1::path1 arg1; e2::path2 arg2;...)') do |e|
      e.split(';').each do |name_path|
        name, path = name_path.split('::', 2)
        path ||= name # if `::` is not given, regard whole string as path
        command = path.shellsplit
        command[0] = File.expand_path(command[0])
        executables << BenchmarkDriver::Config::Executable.new(name: name, command: command)
      end
    end
    o.on('--rbenv VERSIONS', String, 'Ruby executables in rbenv (x.x.x arg1;y.y.y arg2;...)') do |r|
      r.split(';').each do |version|
        executables << BenchmarkDriver::Rbenv.parse_spec(version)
      end
    end if system("which rbenv > #{File::NULL}")
    o.on('--ridkuse VERSIONS', String, 'Ruby executables in ridk use (x.x.x arg1;y.y.y arg2;...) for RubyInstaller2 on Windows') do |r|
      r.split(';').each do |version|
        executables << BenchmarkDriver::RidkUse.parse_spec(version)
      end
    end if system("ridk version > #{File::NULL} 2>&1")
    o.on('--repeat-count NUM', Integer, 'Try benchmark NUM times and use the fastest result or the worst memory usage') do |v|
      c.repeat_count = v
    end
    o.on('--repeat-result TYPE', String, 'Yield "best", "average" or "worst" result with --repeat-count (default: best)') do |v|
      unless BenchmarkDriver::Repeater::VALID_TYPES.include?(v)
        raise ArgumentError.new("--repeat-result must be #{BenchmarkDriver::Repeater::VALID_TYPES.join(', ')} but got #{v.inspect}")
      end
      c.repeat_result = v
    end
    o.on('--bundler', 'Install and use gems specified in Gemfile') do |v|
      bundler = v
    end
    o.on('--filter REGEXP', String, 'Filter out benchmarks with given regexp') do |v|
      c.filters << Regexp.compile(v)
    end
    o.on('--run-duration SECONDS', Float, 'Warmup estimates loop_count to run for this duration (default: 3)') do |v|
      c.run_duration = v
    end
    o.on('--timeout SECONDS', Float, 'Timeout ruby command execution with timeout(1)') do |v|
      timeout = v
    end if (os = RbConfig::CONFIG['host_os']) && os.match(/linux/) && system("which timeout > #{File::NULL}") # depending on coreutils for now...
    o.on('-v', '--verbose', 'Verbose mode. Multiple -v options increase visilibity (max: 2)') do |v|
      c.verbose += 1
    end
  end
  begin
    c.paths = parser.parse!(ARGV)
  rescue OptionParser::InvalidArgument => e
    abort e.message
  end
  if c.paths.empty?
    abort "No YAML file is specified!\n\n#{parser.help}"
  end

  # Configs that need to be set lazily
  unless executables.empty?
    c.executables = executables
  end
  c.executables.each do |exec|
    if bundler
      exec.command << '-rbundler/setup'
    end
    if timeout
      exec.command = ['timeout', timeout.to_s, *exec.command]
    end
  end

  c.freeze
end

# Parse benchmark job definitions
jobs = config.paths.flat_map do |path|
  job = { 'type' => config.runner_type }

  # Treat *.rb as a single-execution benchmark, others are considered as YAML definition
  if path.end_with?('.rb')
    name = File.basename(path).sub(/\.rb\z/, '')
    script = File.read(path)
    prelude = script.slice!(/\A(^#[^\n]+\n)+/m) || '' # preserve magic comment
    job.merge!('prelude' => prelude, 'benchmark' => { name => script }, 'loop_count' => 1)
  else
    job.merge!(YAML.load_file(path))
  end

  begin
    # `working_directory` is YAML-specific special parameter, mainly for "command_stdout"
    BenchmarkDriver::JobParser.parse(job, default_params: { working_directory: File.dirname(path) })
  rescue ArgumentError
    $stderr.puts "benchmark-driver: Failed to parse #{path.dump}."
    $stderr.puts '  YAML format may be wrong. See error below:'
    $stderr.puts
    raise
  end
end.select do |job|
  config.filters.all? do |filter|
    job.name.match(filter)
  end
end

# Run jobs
BenchmarkDriver::Runner.run(jobs, config: config)