require 'travis'
require 'rugged'
require 'pathname'
require 'fileutils'
require 'curb'

##
# Bootstrap tool for new gems
module Gemplate
  class << self
    ##
    # Insert a helper .new() method for creating a new Gem object

    def new(*args)
      self::Gem.new(*args)
    end
  end

  TEMPLATE = "#{Pathname.new(__FILE__).parent.parent}/template"
  LICENSE_URL = 'https://raw.githubusercontent.com/akerl/licenses/master'

  ##
  # Gem directory object
  class Gem
    def initialize(params = {})
      @name = params[:name]
      @user = params[:user]
      @full_name = params[:full_name]
      @email = params[:email]
      @irc_stanza = params[:irc_stanza]
      @license = params[:license]
    end

    def create
      create_directory
      Dir.chdir @name
      add_license
      process_templates
      adjust_files
      make_repo
      configure_travis
      Dir.chdir '..'
    end

    private

    def create_directory
      fail "#{@name} already exists" if File.exist? @name
      FileUtils.cp_r TEMPLATE, @name
    end

    def dependencies
      source = "#{TEMPLATE}/../gemplate.gemspec"
      File.read(source).lines.select { |x| x.include? 's.add_dev' }.join.strip
    end

    def add_license
      url = "#{LICENSE_URL}/#{@license}.txt"
      File.open('LICENSE', 'w') do |fh|
        license = Curl::Easy.perform(url)
        if license.response_code == 404
          fail ArgumentError, 'Invalid license name provided'
        end
        fh.write license.body_str
      end
    end

    def replacements
      [
        [/AUTHOR_NAME/, @user],
        [/LICENSE_NAME/, @license],
        [/FULL_NAME/, @full_name],
        [/REPO_NAME/, @name],
        [/EMAIL_ADDRESS/, @email],
        [/CURRENT_YEAR/, Time.now.strftime('%Y')],
        [/#DEV_DEPS/, dependencies]
      ]
    end

    def process_templates
      Dir.glob('**/*').each do |path|
        next unless File.file? path
        text = File.read path
        replacements.each { |regex, new| text.gsub! regex, new }
        File.open(path, 'w') { |fh| fh.write text }
      end
    end

    def adjust_files
      moves = [['REPO_NAME.gemspec', "#{@name}.gemspec"],
               ['lib/REPO_NAME.rb', "lib/#{@name}.rb"],
               ['spec/REPO_NAME_spec.rb', "spec/#{@name}_spec.rb"]]
      moves.each { |original, new| FileUtils.move original, new }
    end

    def make_repo
      Rugged::Repository.init_at '.'
      `git remote add origin "git@github.com:#{@user}/#{@name}"`
    end

    def configure_travis
      crypter = Travis::CLI::Encrypt.new
      args = ['encrypt', '--skip-completion-check', '--explode', '-p',
              '--add', 'notifications.irc.channels', @irc_stanza]
      crypter.parse args
      crypter.execute
    rescue Travis::Client::NotLoggedIn
      puts 'Travis IRC configuration failed; ' + \
        'make sure the repo exists on GitHub and Travis, then run:' + \
        "\n   travis #{args.join ' '}"
    end
  end
end

module Travis
  module CLI
    ##
    # Adjust Travis to raise instead of shouting
    class ApiCommand
      def authenticate
        fail Travis::Client::NotLoggedIn if access_token.nil?
      end
    end
  end
end