#!/usr/bin/env ruby

require 'optparse'
require 'ftools'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{File.basename($0)} [path]"

  opts.on("-h", "--help", "Displays this help info") do
    puts opts
    exit 0
  end
  
  opts.on('--grails', "Include the groovy/grails specific rake tasks.") { |val| options[:grails] = val }
  #opts.on('--csharp', "Include the groovy/grails specific rake tasks.") { |val| options[:grails] = val }

  begin
    opts.parse!(ARGV)
  rescue OptionParser::ParseError => e
    warn e.message
    puts opts
    exit 1
  end
end

if ARGV.empty?
  abort "Please specify the directory to migratify, e.g. `#{File.basename($0)} .'"
elsif !File.exists?(ARGV.first)
    abort "`#{ARGV.first}' does not exist."
elsif !File.directory?(ARGV.first)
  abort "`#{ARGV.first}' is not a directory."
elsif ARGV.length > 1
  abort "Too many arguments; please specify only the directory to migratifu."
end

def unindent(string)
  indentation = string[/\A\s*/]
  string.strip.gsub(/^#{indentation}/, "")
end

dirs = [ 'db','db/migrate', 'db/config', 'rake' ]

files = {
  "Rakefile" => unindent(<<-FILE),
    require 'rake'
    Dir[ 'rake/**/*.rake' ].each { |rake| load rake }

    task :default do
      warn "\n[warn] You must specify a rake task to run\n"
    end
  FILE
}

gem_which_loc = ""
gem_name = "migratification"
IO.popen( 'gem which migratification' ) { |f| gem_which_loc = f.gets }
#gem_which_loc = `gem which migratification`

puts "\njason"
puts "\n\nlocation: #{gem_which_loc}"

gem_which_loc.gsub!( /\n/, '' )
gem_which_loc.gsub!( /\/lib\/#{gem_name}.rb/, '' ) if gem_which_loc =~ /\/lib\/#{gem_name}.rb/
gem_which_loc.gsub!( /#{gem_name}.rb/, '' ) if gem_which_loc =~ /#{gem_name}.rb/

puts "\nCreating directories..."

# Create the directories
dirs.each do |dir|
  if File.exists?(dir)
    warn "[skip] `#{dir}' already exists"
  elsif File.exists?(dir.downcase)
    warn "[skip] `#{dir.downcase}' exists, which could conflict with `#{file}'"
  else
    puts "[create] directory `#{dir}'"
    FileUtils.mkdir_p( dir )
  end
end

puts "\nCreating Rakefile..."

# Create the files
base = ARGV.shift
files.each do |file, content|
  file = File.join(base, file)
  if File.exists?(file)
    warn "[skip] `#{file}' already exists"
  elsif File.exists?(file.downcase)
    warn "[skip] `#{file.downcase}' exists, which could conflict with `#{file}'"
  elsif !File.exists?(File.dirname(file))
    warn "[skip] directory `#{File.dirname(file)}' does not exist"
  else
    puts "[add] writing `#{file}'"
    File.open(file, "w") { |f| f.write(content) }
  end
end

puts "\nCopying resources..."

# Copy the other files
Dir["#{gem_which_loc}/resources/rake/all/**/*.rake"].each do |file|
  file_path = File.join( base, "rake", File.basename( file ) )
  
  if File.exists?(file_path)
    warn "[skip] `#{file_path}' already exists"
  elsif File.exists?(file_path.downcase)
    warn "[skip] `#{file_path.downcase}' exists, which could conflict with `#{file}'"
  elsif !File.exists?(File.dirname(file_path))
    warn "[skip] directory `#{File.dirname(file_path)}' does not exist"
  else
    puts "[add] writing `#{file_path}'"
    File.copy( file, file_path, false )
  end
end

if options[:grails] == true
  file_name = "grails.rake"
  file_path = File.join( base, "rake", file_name )
  puts "[add] writing `#{file_path}'"
  FileUtils.copy( File.join( gem_which_loc, "resources", "rake", "optional", file_name ), file_path )
end

puts "\n[done] migratified!\n\n"