fs = require 'fs'
{exec,spawn} = require 'child_process'
util = require 'util'
glob = require 'glob'

sources = [
  'gamepad.coffee'
  'init.coffee'
]
sourcestring = ""
for source in sources
  sourcestring += 'src/'+source+' '

task 'watch', 'Watch source files and build changes', ->
  watch = spawn "node_modules/coffeescript/bin/coffee", ['-c', '-w', '-m', '--no-header', '-j', 'lib/index.js', sourcestring]
  watch.stdout.on 'data', (data) -> console.log data.toString().trim()

task 'compile', 'Compile all CoffeeScript files', ->
  # prepare lib directory
  if not fs.existsSync 'lib'
    fs.mkdirSync 'lib'
  
  # run coffee-script compile
  exec "cat #{sourcestring} > lib/index.coffee"

  files = glob.sync('src/mappings/*.json')
  mappings = []
  for file in files
    data = JSON.parse(fs.readFileSync(file))
    mappings.push data
  code = fs.readFileSync("lib/index.coffee")
  writestr = "mappings = JSON.parse('#{JSON.stringify(mappings)}')"
  code = writestr + "\n\n" + code
  fs.writeFileSync("lib/index.coffee", code)

  exec "node_modules/coffeescript/bin/coffee --compile --map --no-header lib/index.coffee", (err, stdout, stderr) ->
    if err
      util.log err
      process.exit 1 # abort npm packaging
    fs.unlink("lib/index.coffee", () -> )
    util.log "Compiled CoffeeScript."

task 'build', 'Compile and minify all CoffeeScript files', ->
  invoke 'compile'
  exec 'closure-compiler --compilation_level ECMASCRIPT5 --compilation_level SIMPLE --create_source_map=lib/index.min.js.map --js_output_file lib/index.min.js lib/index.js', (err) ->
    if err
      util.log err
      process.exit 1 # abort npm packaging
    fs.appendFileSync('lib/index.min.js', "\n//# sourceMappingURL=index.min.js.map")
    util.log "Minified JavaScript."