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require 'u3d/utils'
require 'fileutils'
require 'file-tail'

module U3d
  # Launches Unity with given arguments
  class Runner
    def run(installation, args, raw_logs: false)
      log_file = find_logFile_in_args(args)

      if log_file # we wouldn't want to do that for the default log file.
        File.delete(log_file) if File.file?(log_file) # We only delete real files
      else
        log_file = installation.default_log_file
      end

      Utils.ensure_dir File.dirname(log_file)
      FileUtils.touch(log_file) unless File.exist? log_file

      tail_thread = Thread.new do
        begin
          if raw_logs
            pipe(log_file) { |l| UI.message l.rstrip }
          else
            analyzer = LogAnalyzer.new
            pipe(log_file) { |l| analyzer.parse_line l }
          end
        rescue => e
          UI.error "Failure while trying to pipe #{log_file}: #{e.message}"
          e.backtrace.each { |l| UI.error "  #{l}" }
        end
      end

      # Wait for tail_thread setup to be complete
      sleep 0.5 while tail_thread.status != 'sleep'
      tail_thread.run

      begin
        args.unshift(installation.exe_path)
        if Helper.windows?
          args.map! { |a| a =~ / / ? "\"#{a}\"" : a }
        else
          args.map!(&:shellescape)
        end
        
        U3dCore::CommandExecutor.execute(command: args, print_all: true)
      ensure
        sleep 1
        Thread.kill(tail_thread)
      end
    end

    def find_logFile_in_args(args)
      find_arg_in_args('-logFile', args)
    end

    def find_projectpath_in_args(args)
      find_arg_in_args('-projectpath', args)
    end

    def find_arg_in_args(arg_to_find, args)
      raise 'Only arguments of type array supported right now' unless args.is_a?(Array)
      args.each_with_index do |arg, index|
        return args[index + 1] if arg == arg_to_find && index < args.count - 1
      end
      nil
    end

    private

    def pipe(file)
      File.open(file, 'r') do |f|
        f.extend File::Tail
        f.interval = 0.1
        f.max_interval = 0.4
        f.backward 0
        Thread.stop
        f.tail { |l| yield l }
      end
    end
  end
end