#!/usr/bin/env ruby
require 'rubygems'
require 'bundler/setup'

require 'fileutils'
require 'rack'
require 'term/ansicolor'

require 'ruby_app'
require 'yaml'

extend Term::ANSIColor

def usage
  <<-USAGE
usage: ruby_app <command> <arguments>

Available commands include:
  create application    Create a basic application in the current folder named <arguments>.

USAGE
end

def create_folder(destination, replacements = [])
  _destination = destination
  replacements.each do |replacement|
    _destination = _destination.gsub(replacement[:pattern], replacement[:text])
  end
  unless File.exists?(File.dirname(_destination))
    create_folder(File.dirname(_destination))
  end
  unless File.exists?(_destination)
    action = :created
    FileUtils.mkdir(_destination)
  else
    action = :skipped
  end
  puts "#{_destination.sub(FileUtils.pwd, '.')} ... #{bold}#{action}#{clear}"
end

def copy_file(source, destination, replacements = [])
  _destination = File.join(destination, File.basename(source))
  replacements.each do |replacement|
    _destination = _destination.gsub(replacement[:pattern], replacement[:text])
  end
  action = nil
  if File.exists?(_destination)
    if File.mtime(source) > File.mtime(_destination)
      action = :replaced
    else
      action = :skipped
    end
  else
    action = :created
  end
  unless action == :skipped
    FileUtils.mv(_destination, "#{_destination}.replaced", :force => true) if action == :replaced
    FileUtils.cp(source, File.dirname(_destination))
    FileUtils.mv(File.join(File.dirname(_destination), File.basename(source)), _destination) unless File.join(File.dirname(_destination), File.basename(source)) == _destination
    replacements.each do |replacement|
      system "sed 's/#{replacement[:pattern].source}/#{replacement[:text]}/' < '#{_destination}' > '#{_destination}.out'"
      FileUtils.rm(_destination)
      FileUtils.mv("#{_destination}.out", _destination)
    end
  end
  puts "#{_destination.sub(FileUtils.pwd, '.')} ... #{bold}#{action}#{clear}"
end

def copy_folder(source, destination, replacements = [])
  create_folder(destination, replacements)
  Dir.new(source).each do |item|
    unless item.start_with?('.')
      if File.directory?(File.join(source, item))
        copy_folder(File.join(source, item), File.join(destination, File.basename(item)), replacements)
      else
        copy_file(File.join(source, item), destination, replacements)
      end
    end
  end
end

def create_application
  argument = $*[2]
  _class = upcode(argument)
  folder = downcode(argument)
  full_folder = File.join(FileUtils.pwd, downcode(argument))
  replacements =  [
                    {
                      :pattern => /_APPLICATION_DOWNCODE_/,
                      :text => folder
                    },
                    {
                      :pattern => /_APPLICATION_UPCODE_/,
                      :text => _class
                    }
                  ]
  source = File.join(File.dirname(__FILE__), %w[.. lib ruby_app templates application])
  copy_folder(source, full_folder, replacements)
end

def downcode(value)
  value = value.gsub(/::/, '/')
  value = value.gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2')
  value = value.gsub(/([a-z\d])([A-Z])/,'\1_\2')
  value = value.tr("-", "_")
  value.downcase
end

def upcode(value)
  value = value.gsub(/\/(.?)/) { "::#{$1.upcase}" }
  value.gsub(/(?:^|_)(.)/) { $1.upcase }
end

unless $*[0]
  puts usage
else
  case $*[0].downcase
    when 'create'
      case $*[1].downcase
        when 'application'
          create_application
        else
          puts "Blank or unrecognized command '#{$*[1].downcase}'"
          puts usage
      end
    else
      puts "Blank or unrecognized command '#{$*[0].downcase}'"
      puts usage
  end
end