begin
  %w[rake tmpdir fileutils simple-rss open-uri].each { |f| require f }
rescue LoadError
  require 'rubygems' unless ENV['NO_RUBYGEMS']
  %w[rake tmpdir fileutils simple-rss open-uri].each { |f| require f }
end

lib_dir = 'lib'
tmp_dir = Dir.tmpdir

namespace :jquery do
  
  desc "Add latest jquery core, ui and themes to #{lib_dir}"
  task :add => [:add_core, :add_ui, :add_themes]

  desc "Add latest jQuery to library"
  task :add_core do
    uri = first(jquery_atom){ |e| e.content.gsub(/.*a href="(.*)".*/m, '\1') if e.title.include?('.min.js') }
    get_and_install(uri, lib_dir, 'jquery.min.js')  
  end
  
  desc "Add latest jQueryUI (without theme) to library"
  task :add_ui do
    uri =  first(jqueryui_atom){ |e| e.content.gsub(/.*a href="(.*)".*/m, '\1') unless e.title.include?('themes') }  
    file = uri.gsub(/.*files\/(.*)(\d.\drc\d.\d|\d.\drc\d|\d\.\d\.\d|\d\.\d)(.*)/, '\1\2\3') 
    get_and_install(uri, tmp_dir, file)
    unzip_and_install(lib_dir, tmp_dir, file)
  end

  desc "Add all themes to libary"
  task :add_themes do
    uri =  first(jqueryui_atom){ |e| e.content.gsub(/.*a href="(.*)".*/m, '\1') if e.title.include?('themes') }  
    file = uri.gsub(/.*files\/(.*)(\d.\drc\d.\d|\d.\drc\d|\d\.\d\.\d|\d\.\d)(.*)/, '\1\2\3') 
    get_and_install(uri, tmp_dir, file)
    unzip_and_install(lib_dir, tmp_dir, file)      
  end

  desc "Add specific version of jQuery library: see with VERSION=X.X.X on command line"
  task :add_version do
    version = ENV['VERSION']
    return puts('No version specified - add VERSION=X.X.X to rake command') if version.nil?
    uri = first(jquery_atom){ |e| e.content.gsub(/.*a href="(.*)".*/m, '\1') if e.title.include?(version) }
    return puts("Specified version #{version} not found in repository - use rake jquery:core:versions to determine available versions") if uri.nil?
    get_and_install(uri, lib_dir, "jquery-#{version}.min.js") 
  end

  desc "List all versions for core and ui "
  task :versions => [:versions_core, :versions_ui]
 
  desc "List jQuery packages available"
  task :versions_core do
    versions(jquery_atom){ |e| e.title.gsub(/jquery-(\d\.\d\.\d|\d\.\d).*/, '\1') }
  end
  
  desc "List jQuery UI packages available"
  task :versions_ui do
    versions(jqueryui_atom){ |e| e.title.gsub(/.*-(\d.\drc\d.\d|\d.\drc\d|\d\.\d\.\d|\d\.\d).*/, '\1') }
  end  

  desc "List all packages for core and ui"
  task :packages => [:packages_core, :packages_ui]

  desc "List versions of released packages"
    task :packages_core do
      versions(jquery_atom){ |e| e.title }
    end

  desc "List versions of released packages"
  task :packages_ui do   
    versions(jqueryui_atom){ |e| e.title }
  end
          
end

  
  def jqueryui_atom
    puts "Checking jQueryUI respository on Google Code"
    SimpleRSS.parse open('http://code.google.com/feeds/p/jquery-ui/downloads/basic')        
  end

  def jquery_atom
    puts "Checking jQuery respository on Google Code"
    SimpleRSS.parse open('http://code.google.com/feeds/p/jqueryjs/downloads/basic')    
  end

  def versions(atom)
    versions = []
    atom.entries.each do |entry| 
      versions << yield(entry)
    end
    puts versions.uniq 
    versions     
end

def first(atom)
  atom.entries.each do |entry| 
    link = yield(entry)
    return link unless link.nil?
  end 
  nil  
end

def get_and_install(uri, path, file)
  puts "Downloading file #{uri}"
  download = URI.parse(uri)
  
  unless File.directory?(path)
    puts "Making new directory #{path}"
    FileUtils.mkdir_p(path)
  end
  
  new_file = File.join(path, file)
  puts "Saving new library file: #{new_file}"
  
  File.open(new_file, 'w') do |file|
    download.open { |jq| jq.each_line {|line| file.puts line} }    
  end unless File.exists?(new_file)
  new_file
end

def unzip_and_install(dest, tmp_dir, file)
  
  puts tmp_dir
  # dest = File.join(dest)
  extracted_folder = File.join(tmp_dir, file.gsub(/(.*)\.zip/, '\1'))

  if /mswin|mingw/ =~ RUBY_PLATFORM then
    zip = ENV['ZIP'] || '7z'
    puts "*********************************"
    puts "Extracting using #{zip} - this should be on your path or set the ZIP=path/to/zip/cmd on rake command using 'x -o #{tmp_dir} #{tmp_dir}/#{file}'"
    puts "*********************************"
    `#{zip} x -o#{tmp_dir} #{tmp_dir}/#{file}`
  else
    puts "Extracting files #{tmp_dir}/#{file} to #{tmp_dir}"
    `unzip -o #{tmp_dir}/#{file} -d #{tmp_dir}`
  end
   
   puts "Copying ui and themes in #{extracted_folder} to #{dest}"
   FileUtils.cp(Dir.glob("#{extracted_folder}/ui/jquery*.js"), dest) rescue nil
   
   begin
     FileUtils.cp_r("#{patch_themes_path(extracted_folder)}/themes", dest)
   rescue LoadError
     puts "Error in the way JQuery Themes was packaged please contact gem owner for patch"
   end
   
   puts 'Cleaning extracted files'
   # FileUtils.rm "#{tmp_dir}/#{file}"  # I'm allowing for caching
   FileUtils.rm_rf extracted_folder
end

def patch_themes_path(extracted_path)
  extracted_path.gsub(/1.7.2.0/, '1.7.2')
end