coffeecup = require './coffeecup'
fs = require 'fs'
path = require 'path'
log = console.log
{OptionParser} = require 'coffee-script/lib/coffee-script/optparse'

argv = process.argv[2..]
options = null

handle_error = (err) -> console.log err.stack if err

watch = (files, fn) ->
  if false #fs.watch should be used, but it's not working properly
    for file in files
      do ->
        currentFile = file
        fs.watch currentFile, (event) ->
          fn(currentFile) if event is 'change'
  else
    for file in files
      do ->
        currentFile = file
        fs.watchFile currentFile, {persistent: true, interval: 500}, (curr, prev) ->
          fn(currentFile) unless curr.size is prev.size and curr.mtime.getTime() is prev.mtime.getTime()

compile = (input_path, output_directory, js, namespace = 'templates') ->
  if Array.isArray input_path
    i = 0
    body = ''
    appendTemplate = ->
      if i >= input_path.length or not options.package
        output = """
          (function(){ 
            this.#{namespace} || (this.#{namespace} = {});
            #{body}
          }).call(this);
        """
        write input_path[0], namespace, output, output_directory, '.js'
      else
        fs.readFile input_path[i], 'utf-8', (err, contents) ->
          handle_error err
          name = path.basename input_path[i], path.extname(input_path[i])
          func = coffeecup.compile contents, options
          body += "this.#{namespace}[#{JSON.stringify name}] = #{func};\n"
          i += 1
          appendTemplate()
    return appendTemplate()
  fs.readFile input_path, 'utf-8', (err, contents) ->
    handle_error err

    name = path.basename input_path, path.extname(input_path)

    if not js
      output = coffeecup.render contents, options
      ext = '.html'
    else
      func = coffeecup.compile contents, options
      output = """
        (function(){ 
          this.#{namespace} || (this.#{namespace} = {});
          this.#{namespace}[#{JSON.stringify name}] = #{func};
        }).call(this);
      """
      ext = '.js'

    write input_path, name, output, output_directory, ext

write = (input_path, name, contents, output_directory, ext) ->
  filename = name + ext
  dir = output_directory or path.dirname input_path
  exists = fs.exists or path.exists
  exists dir, (exists) ->
    unless exists then fs.mkdirSync dir

    output_path = path.join dir, filename
    contents = ' ' if contents.length <= 0
    fs.writeFile output_path, contents, (err) ->
      handle_error err
      log contents if options.print
      log "Compiled #{input_path}" if options.watch

usage = '''
  Usage:
    coffeecup [options] path/to/template.coffee
'''

switches = [
  ['-j', '--js', 'compile template to js function (template + embedded renderer)']
  ['-b', '--bare', 'use with -j to compile template to js (template only)' ]
  ['-c', '--core', 'use with -j to compile renderer to js (renderer only)' ]
  ['-n', '--namespace [name]', 'global object holding the templates (default: "templates")']
  ['-w', '--watch', 'watch templates for changes, and recompile']
  ['-o', '--output [dir]', 'set the directory for compiled html']
  ['-p', '--print', 'print the compiled html to stdout']
  ['-f', '--format', 'apply line breaks and indentation to html output']
  ['-u', '--utils', 'add helper locals (currently only "render")']
  ['-z', '--optimize', 'optimize resulting JS']
  ['-v', '--version', 'display coffeecup version']
  ['-h', '--help', 'display this help message']
  ['-k', '--package', 'use with -j to include all templates in a single [namespace].js']
]
 
@run = ->
  parser = new OptionParser switches, usage
  options = parser.parse argv
  args = options.arguments
  delete options.arguments

  log parser.help() if options.help or argv.length is 0
  log coffeecup.version if options.version
  if options.utils
    options.locals ?= {}
    options.locals.render = (file) ->
      contents = fs.readFileSync file, 'utf-8'
      coffeecup.render contents, options

  if args.length > 0
    files = args[..]

    if options.watch
      watch files, (file) ->
        if options.package and options.js
          compile files, options.output, options.js, options.namespace
        else
          compile file, options.output, options.js, options.namespace
    if options.js and options.package
      compile files, options.output, options.js, options.namespace
    else
      for file in files
        compile file, options.output, options.js, options.namespace