# config/deploy.exs

use Bootleg.DSL

# map Bootleg environment to Mix environment
mix_env =
  case config(:env) do
    # by default when not specified at all
    :production -> "prod"
    # when specified explicitly as a string
    # in mix.exs or passed on command line
    "production" -> "prod"
    "staging" -> "stage"
    env -> "Unknown environment: #{inspect(env)}"
  end

# https://hexdocs.pm/bootleg/config/environments.html
# https://hexdocs.pm/bootleg/reference/options.html
#
# overrides Mix environment inside Bootleg - it doesn't change MIX_ENV
# so other services (like CircleCI) continue to work as usual.
#
# according to docs default value is "prod" but it's not set anywhere -
# this option is always read as `config({:mix_env, "prod"})` effectively
# using "prod" by default when the value is nil.
#
# still I need to know current Mix environment to build different paths
# so I use current Bootleg environment to set `mix_env` option which is
# then used to build paths.
#
# NOTE: when configured this way Bootleg is fully agnostic about MIX_ENV.
config :mix_env, mix_env

# https://hexdocs.pm/bootleg/reference/role_host_options.html
# https://hexdocs.pm/bootleg/reference/options.html
config :app, :my_app
config :version, Mix.Project.config()[:version]
# SSH username
config :user, "#{config(:app)}"
config :build_path, "/tmp/bootleg/build"
# release archive is unpacked right inside this directory
# (subdirectory with application name is not created)
config :deploy_path, "/home/#{config(:app)}/#{config(:mix_env)}/app"
config :release_path, "/home/#{config(:app)}/#{config(:mix_env)}/releases"
config :silently_accept_hosts, true

task :symlink_secret_file do
  remote :build do
    """
    ln -sfn \
      /var/#{config(:app)}/config/#{config(:mix_env)}.secret.exs \
      #{config(:build_path)}/config/#{config(:mix_env)}.secret.exs
    """
  end
end

# https://hexdocs.pm/phoenix/deployment.html
# https://hexdocs.pm/bootleg/reference/phoenix.html
task :phx_digest do
  remote :build, cd: "assets" do
    "npm install"
    # runs `deploy` script from assets/package.json
    "npm run deploy"
  end

  remote :build do
    "MIX_ENV=prod mix phx.digest"
  end
end

# https://hexdocs.pm/distillery/guides/running_migrations.html
# https://dockyard.com/blog/2018/08/23/announcing-distillery-2-0
task :migrate do
  remote :db do
    # runs rel/commands/migrate.sh script
    "bin/#{config(:app)} migrate"
  end
end

task :restart_service do
  service_name = "#{config(:app)}_#{config(:mix_env)}"

  remote :system do
    "sudo systemctl restart #{service_name}"
  end
end

# https://hexdocs.pm/bootleg/reference/workflow.html
before_task(:compile, :symlink_secret_file)
after_task(:compile, :phx_digest)
after_task(:deploy, :migrate)
after_task(:migrate, :restart_service)

# config/deploy/production.exs

use Bootleg.DSL

config :host, "172.XXX.XXX.XX"

# `build` role defines what remote server release should be built on
role(
  :build,
  config(:host),
  user: config(:user),
  # path of the remote build workspace
  workspace: config(:build_path),
  # path where the newly-built release should be copied
  release_workspace: config(:release_path),
  silently_accept_hosts: config(:silently_accept_hosts)
)

# `app` role defines what remote servers release should be deployed to
role(
  :app,
  config(:host),
  user: config(:user),
  # path of application workspace
  workspace: config(:deploy_path),
  # path where the release should be found
  # (use the same value for build and app roles)
  release_workspace: config(:release_path),
  silently_accept_hosts: config(:silently_accept_hosts)
)

# https://hexdocs.pm/bootleg/config/roles.html
#
# custom roles
role(:db, config(:host), user: config(:user), workspace: config(:deploy_path))
role(:system, config(:host), user: "devops")

# mix.exs

defp aliases do
  [
    # ...
    deploy: &deploy/1
  ]
end

defp deploy(_) do
  Mix.Task.run("bootleg.build", ["production"])
  Mix.Task.run("bootleg.deploy", ["production"])
end

# config/deploy.exs

config :refspec, "feature/2-refactor-eva-for-anna"

# config/deploy.exs

config :version, "0.0.1"