require "engineyard"
require "engineyard/cli"
require "houston/adapters/deployment/engineyard/config"

module Houston
  module Adapters
    module Deployment
      class Engineyard
        attr_reader :project, :environment_name

        def initialize(project, environment_name)
          @project = project
          @environment_name = environment_name

          @config = Houston::Adapters::Deployment::Engineyard::Config.new(project.read_file("config/ey.yml"))
          @ui = EY::CLI::UI.new
          @api = EY::CLI::API.new(config.endpoint, ui, Houston.config.engineyard[:api_token])
          @repo = nil
        end


        def last_deploy_commit
          app_env.last_deployment.commit
        end


        # https://github.com/engineyard/engineyard/blob/v3.0.1/lib/engineyard/cli.rb#L123
        def deploy(deploy, options={})
          options = {
            ref: deploy.branch,
            environment: environment_name,
            config: { maintenance_on_migrate: options[:maintenance_page] }
          }.with_indifferent_access

          env_config = config.environment_config(app_env.environment_name)
          deploy_config = EY::DeployConfig.new(options, env_config, repo, ui)

          deployment = app_env.new_deployment(
            ref:                deploy_config.ref,
            migrate:            deploy_config.migrate,
            migrate_command:    deploy_config.migrate_command,
            extra_config:       deploy_config.extra_config,
            serverside_version: EY::ENGINEYARD_SERVERSIDE_VERSION)

          runner = EY::ServersideRunner.new(
            bridge:             app_env.environment.bridge!(options[:ignore_bad_master]).hostname,
            app:                app_env.app,
            environment:        app_env.environment,
            verbose:            deploy_config.verbose,
            serverside_version: EY::ENGINEYARD_SERVERSIDE_VERSION)

          # Triplicate:
          #  1. standard output gets a copy
          #  2. the Deploy model gets a copy
          #  3. EngineYard gets a copy
          out = EY::CLI::UI::Tee.new(ui.out, deploy.output_stream, deployment.output)
          err = EY::CLI::UI::Tee.new(ui.err, deploy.output_stream, deployment.output)

          deployment.start

          begin
            ui.show_deployment(deployment)

            runner.deploy do |args|
              args.config = deployment.config if deployment.config
              if deployment.migrate
                args.migrate = deployment.migrate_command
              else
                args.migrate = false
              end
              args.ref = deployment.resolved_ref
            end

            deployment.successful = runner.call(out, err)

            Houston.try({max_tries: 5, ignore: true}, exceptions_wrapping(PG::ConnectionBad)) do
              deploy.update_attributes!(successful: deployment.successful, completed_at: Time.now)
            end

          rescue StandardError => e
            Houston.report_exception(e)
            deployment.err << "Error encountered during deploy.\n#{e.class} #{e}\n"
            ui.print_exception(e)

          ensure
            deployment.finished
          end

          deployment.successful?
        end

      private
        attr_reader :config, :ui, :api, :repo

        def app_env
          @app_env ||= begin
            resolver = api.resolve_app_environments(
              account_name: "EP",
              app_name: project.slug,
              environment_name: environment_name)
            resolver.matches.first
          end
        end

      end
    end
  end
end