require 'yaml'
require 'json'


##################################################################
#This file contains everything relating to compiling source files
##################################################################

module Flok
  #Merge a bunch of source files
  #Take everything in a DIR_PATH folder that matches the TYPE and put it in a file OUTPUT_PATH
  #Will also create the path if it dosen't exist
  def self.src_glob type, dir_path, output_path
    out = ""
    FileUtils.mkdir_p(dir_path)
    FileUtils.mkdir_p(File.dirname(output_path))
    Dir[File.join(dir_path, "*.#{type}")].each do |f|
      out << File.read(f) << "\n"
    end

    File.write(output_path, out)
  end

  #Build the whole world for a certain platform
  def self.build_world build_path, platform
    #What platform are we working with?
    `rm -rf #{build_path}`

    #1. `rake build` is run inside `./app/drivers/$platform`
    driver_build_path = File.expand_path("drivers", build_path)
    FileUtils.mkdir_p driver_build_path
    Dir.chdir("./app/drivers/#{platform}") do 
    system!("rake build BUILD_PATH=#{driver_build_path}")
    end

    #2. All js files in `./app/kern/config/*.js` are globbed togeather and sent to `./products/$platform/glob/1kern_config.js`
    Flok.src_glob("js", './app/kern/config', "#{build_path}/glob/1kern_config.js")

    #3. All js files in `./app/kern/*.js` are globbed togeather and sent to `./products/$platform/glob/2kern.js`
    Flok.src_glob("js", './app/kern', "#{build_path}/glob/2kern.js")

    #4. All js files are globbed from `./products/$platform/glob` and combined into `./products/$platform/application.js`
    Flok.src_glob("js", "#{build_path}/glob", "#{build_path}/application.js")

    #5. Add custom commands
    ################################################################################################################
    #lsiface() - List interfaces for driver config.yml
    #---------------------------------------------------------------------------------------
    #Load the driver config.yml
    driver_config = YAML.load_file("./app/drivers/#{platform}/config.yml")
    raise "No config.yml found in your 'platform: #{platform}' driver" unless  driver_config

    #Create array that looks like a javascript array with single quotes
    iface_arr = "[" + driver_config['ifaces'].map!{|e| "'#{e}'"}.join(", ") + "]"

    #Append this to our output file
    `echo "IFACES = #{iface_arr};" >> #{build_path}/application.js`
    `echo "PLATFORM = \'#{platform}\';" >> #{build_path}/application.js`
    #---------------------------------------------------------------------------------------
    ################################################################################################################

    `rm -rf #{build_path}/glob`
  end

  def self.system! cmd
    res = system(cmd)
    out = ""
    out << "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n"
    out << "SHELL ERROR\n"
    out << "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n\n"
      out << "\t(user@localhost) #{cmd}\n"
      out << "\t(user@localhost) echo $?\n"
      out << "\t#{res}\n"
      out << "\t(user@localhost) pwd\n\t"
      out << `pwd`
    out << "\n@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n"
    raise out unless res
  end
end