require 'rbconfig'
require 'active_support/core_ext/string'
require 'thor'
require 'thor/group'
require 'kaui/version'

module KauiCmd

  class Installer < Thor::Group
    include Thor::Actions

    desc 'Install Kaui inside an existing rails project'

    argument :app_path, :type => :string, :desc => 'rails app_path', :default => '.'

    class_option :version, :type => :string, :desc => 'Kaui Version to use'

    class_option :edge, :type => :boolean

    class_option :path, :type => :string, :desc => 'Kaui gem path'
    class_option :git, :type => :string, :desc => 'Kaui gem git url'
    class_option :ref, :type => :string, :desc => 'Kaui gem git ref'
    class_option :branch, :type => :string, :desc => 'Kaui gem git branch'
    class_option :tag, :type => :string, :desc => 'Kaui gem git tag'

    class_option :skip_bundle, :type => :boolean, :desc => "Don't run bundle install"

    def verify_rails
      unless rails_project?
        say "#{@app_path} is not a rails project."
        exit 1
      end
    end

    def prepare_options
      @kaui_gem_options = {}

      if options[:edge]
        @kaui_gem_options[:git] = 'git://github.com/killbill/killbill-admin-ui.git'
      elsif options[:path]
        @kaui_gem_options[:path] = options[:path]
      elsif options[:git]
        @kaui_gem_options[:git] = options[:git]
        @kaui_gem_options[:ref] = options[:ref] if options[:ref]
        @kaui_gem_options[:branch] = options[:branch] if options[:branch]
        @kaui_gem_options[:tag] = options[:tag] if options[:tag]
      elsif options[:version]
        @kaui_gem_options[:version] = options[:version]
      else
        version = Kaui::VERSION
        @kaui_gem_options[:version] = version.to_s
      end
    end

    def add_gems
      inside @app_path do
        gem :kaui, @kaui_gem_options
        run 'bundle install', :capture => true unless options[:skip_bundle]
      end
    end

    def initialize_kaui
      inside @app_path do
        run "rails generate kaui:install", :verbose => false
      end
    end

    private

      def rails_project?
        File.exists?(File.join(@app_path, 'script', 'rails')) || File.exists?(File.join(@app_path, 'bin', 'rails'))
      end

      def gem(name, gem_options={})
        say_status :gemfile, name
        parts = ["'#{name}'"]
        parts << ["'#{gem_options.delete(:version)}'"] if gem_options[:version]
        gem_options.each { |key, value| parts << ":#{key} => '#{value}'" }
        append_file 'Gemfile', "gem #{parts.join(', ')}\n", :verbose => false
      end
  end
end