module DPL
  class Provider
    module Heroku
      class Anvil < Git
        HEROKU_BUILDPACKS = ['ruby', 'nodejs', 'clojure', 'python', 'java', 'gradle', 'grails', 'scala', 'play']
        HEROKU_BUILDPACK_PREFIX = "https://github.com/heroku/heroku-buildpack-"
        requires 'anvil-cli', :load => 'anvil/engine'
        requires 'excon' # comes with heroku
        requires 'json'

        def api
          raise Error, 'anvil deploy strategy only works with api_key' unless options[:api_key]
          super
        end

        def deploy
          warn ''
          if options[:strategy]
            warn 'You have explicitly set your deploy strategy to %p.' % options[:strategy]
            warn 'Anvil support will be dropped in the near future.'
            warn 'Please consider changing it to "api" or "git".'
          else
            warn 'The default strategy for Heroku deployments is currently "anvil".'
            warn 'This will be changed to "api" in the near future.'
            warn 'Consider setting it explicitly to "api" or "git".'
          end
          warn ''

          super
        end

        def push_app
          sha = context.env['TRAVIS_COMMIT'] || `git rev-parse HEAD`.strip
          response = Excon.post release_url,
            :body    => { "slug_url" => slug_url, "description" => "Deploy #{sha} via Travis CI" }.to_json,
            :headers => { 'Content-Type' => 'application/json', 'Accept' => 'application/json' }

          print "\nDeploying slug "
          while response.status == 202
            location = response.headers['Location']
            response = Excon.get("https://:#{option(:api_key)}@cisaurus.heroku.com#{location}")
            sleep(1)
            print '.'
          end

          if response.status.between? 200, 299
            puts " success!"
          else
            raise Error, "deploy failed, anvil response: #{response.body}"
          end
        end

        def slug_url
          @slug_url ||= begin
            ::Anvil.headers["X-Heroku-User"] = user
            ::Anvil.headers["X-Heroku-App"]  = option(:app)
            if HEROKU_BUILDPACKS.include? options[:buildpack]
              options[:buildpack] = HEROKU_BUILDPACK_PREFIX + options[:buildpack] + ".git"
            end
            ::Anvil::Engine.build ".", :buildpack => options[:buildpack]
          rescue ::Anvil::Builder::BuildError => e
            raise Error, "deploy failed, anvil build error: #{e.message}"
          end
        end

        def release_url
          "https://:#{option(:api_key)}@cisaurus.heroku.com/v1/apps/#{option(:app)}/release"
        end
      end
    end
  end
end