rambler-digital-solutions/Generamba

require 'generamba/template/installer/abstract_installer.rb'
require 'generamba/template/helpers/rambaspec_validator.rb'
require 'git'
require 'fileutils'
require 'tmpdir'

module Generamba

  # Incapsulates the logic of fetching remote templates, verifying and installing them
  class RemoteInstaller < AbstractInstaller
    def install_template(template_declaration)
      template_name = template_declaration.name
      puts("Installing #{template_name}...")

      repo_url = template_declaration.git
      repo_branch = template_declaration.branch

      temp_path = Dir.tmpdir()
      template_dir = Pathname.new(temp_path).join(template_name)

      if repo_branch != nil
        Git.export(repo_url, template_name, :branch => repo_branch, :path => temp_path)
      else
        Git.clone(repo_url, template_name, :path => temp_path)
      end

      template_path = "#{template_dir}"

      rambaspec_exist = Generamba::RambaspecValidator.validate_spec_existance(template_name, template_path)
      unless rambaspec_exist
        FileUtils.rm_rf(temp_path)
        error_description = "Cannot find #{template_name + RAMBASPEC_EXTENSION} in the root directory of specified repository.".red
        raise StandardError.new(error_description)
      end

      rambaspec_valid = Generamba::RambaspecValidator.validate_spec(template_name, template_path)
      unless rambaspec_valid
        error_description = "#{template_name + RAMBASPEC_EXTENSION} is not valid.".red
        raise StandardError.new(error_description)
      end

      install_path = Pathname.new(TEMPLATES_FOLDER)
                         .join(template_name)
      FileUtils.mkdir_p install_path
      FileUtils.copy_entry(template_path, install_path)

      FileUtils.rm_rf(temp_path)
    end
  end
end