require 'slop'
require_relative 'command_logger'

module Flydata
  class Cli
    include Helpers
    include CommandLoggable
    def initialize(args)
      @args = args
      unless $log
        $log = Logger.new(FLYDATA_LOG)
        # 2014-10-24 14:05:21 -0700 command.info: message
        $log.datetime_format = "%Y-%m-%d %H:%M:%S %z "
        $log.formatter = proc do |severity, datetime, progname, msg|
          "#{datetime} command.#{severity.to_s.downcase}: #{msg}\n"
        end
      end
      log_info("Start command.", {cmd: @args.join(' '), ver:flydata_version})
    end

    def run
      unless check_environment
        log_error_stderr("Sorry, you have to run the installation command to use flydata. Please go to https://console.flydata.com/ and sign up.")
        return
      end
      begin
        if @args.size > 0
          first_arg = @args.shift
          cmd, sub_cmd = parse_command(first_arg)
          begin
            cmd_cls = "Flydata::Command::#{cmd.capitalize}".constantize
          rescue NameError 
            # NameError is raised when the constant is not defined in its target
            # file, that is, command not found.
            # Other exceptions mean that some other error happended.
            raise "Command not found: #{cmd}"
          end
          # Command class can define options for each subcommand by defining method "slop_subcommandname"
          slop_method = sub_cmd ? "slop_#{sub_cmd}".to_sym : :slop
          options = cmd_cls.respond_to?(slop_method) ? cmd_cls.send(slop_method) : Slop.new(strict: true)
          options.parse!(@args)
          cmd_obj = cmd_cls.new(options)
          sub_cmd ? cmd_obj.send(sub_cmd,*@args) : cmd_obj.run(*@args)
        else
          $stderr.puts usage_text(false)
          return
        end
      rescue => e
        #raise e
        $stderr.puts "! #{e.to_s}"
        $stderr.puts
        $stderr.puts
        $stderr.puts usage_text
        log_error_with_backtrace('Error occured during command.', {error: e, args: @args})
        raise e if FLYDATA_DEBUG
        exit 1
      end
    end

    private
    def check_environment
      FileTest.file?(flydata_api_host_file)
    end
    def parse_command(cmd)
      cmd.split(':')
    end
  end
end