require "rubygems"
require "pty"
require "fileutils"
require "rake/testtask"

##
## HELPER
##

def run(cmd)
  PTY.spawn(cmd) do |output, input, pid|
    begin
      while line = output.gets do
        puts line
      end
    rescue Errno::EIO
    end
  end
rescue PTY::ChildExited
end

##
## GEM BUILDING AND INSTALLING
##

$spec_path = 'leap_cli.gemspec'
$spec      = eval(File.read($spec_path))
$base_dir  = File.dirname(__FILE__)
$gem_path  = File.join($base_dir, 'pkg', "#{$spec.name}-#{$spec.version}.gem")

def built_gem_path
  Dir[File.join($base_dir, "#{$spec.name}-*.gem")].sort_by{|f| File.mtime(f)}.last
end

desc "Build #{$spec.name}-#{$spec.version}.gem into the pkg directory"
task 'build' do
  FileUtils.mkdir_p(File.join($base_dir, 'pkg'))
  FileUtils.rm($gem_path) if File.exists?($gem_path)
  run "gem build -V '#{$spec_path}'"
  file_name = File.basename(built_gem_path)
  FileUtils.mv(built_gem_path, 'pkg')
  puts "#{$spec.name} #{$spec.version} built to pkg/#{file_name}"
end

desc "Install #{$spec.name}-#{$spec.version}.gem into either system-wide or user gems"
task 'install' do
  if !File.exists?($gem_path)
    puts("Could not file #{$gem_path}. Try running 'rake build'")
  else
    options = '--verbose --conservative --no-rdoc --no-ri'
    if ENV["USER"] == "root"
      run "gem install #{options} '#{$gem_path}'"
    else
      home_gem_path = Gem.path.grep(/home/).first
      puts "You are installing as an unprivileged user, which will result in the installation being placed in '#{home_gem_path}'."
      print "Do you want to continue installing to #{home_gem_path}? [y/N] "
      input = STDIN.readline
      if input =~ /[yY]/
        run "gem install #{options} --user-install '#{$gem_path}'"
      else
        puts "bailing out."
      end
    end
  end
end

desc "Uninstall #{$spec.name}-#{$spec.version}.gem from either system-wide or user gems"
task 'uninstall' do
  if ENV["USER"] == "root"
    puts "Removing #{$spec.name}-#{$spec.version}.gem from system-wide gems"
    run "gem uninstall '#{$spec.name}' --version #{$spec.version} --verbose -x -I"
  else
    puts "Removing #{$spec.name}-#{$spec.version}.gem from user's gems"
    run "gem uninstall '#{$spec.name}' --version #{$spec.version} --verbose --user-install -x -I"
  end
end

##
## TESTING
##

Rake::TestTask.new do |t|
  t.pattern = "test/unit/*_test.rb"
end
task :default => :test

##
## CODE GENERATION
##

desc "Updates the list of required configuration options for this version of LEAP CLI"
task 'update-requirements' do
  Dir.chdir($base_dir) do
    required_configs = `find -name '*.rb' | xargs grep -R 'assert_config!'`.split("\n").collect{|line|
      if line =~ /def/ || line =~ /pre\.rb/
        nil
      else
        line.sub(/.*assert_config! ["'](.*?)["'].*/,'"\1"')
      end
    }.compact
    File.open("#{$base_dir}/lib/leap_cli/requirements.rb", 'w') do |f|
      f.puts "# run 'rake update-requirements' to generate this file."
      f.puts "module LeapCli"
      f.puts "  REQUIREMENTS = ["
      f.puts "    " + required_configs.join(",\n    ")
      f.puts "  ]"
      f.puts "end"
    end
    puts "updated #{$base_dir}/lib/leap_cli/requirements.rb"
    #puts `cat '#{$base_dir}/lib/leap_cli/requirements.rb'`
  end
end

##
## DOCUMENTATION
##

# require 'rdoc/task'

# Rake::RDocTask.new do |rd|
#   rd.main = "README.rdoc"
#   rd.rdoc_files.include("README.rdoc","lib/**/*.rb","bin/**/*")
#   rd.title = 'Your application title'
# end