defmodule GRPC.Mixfile do
  use Mix.Project

  @version "0.8.1"

  def project do
    [
      app: :grpc,
      version: @version,
      elixir: "~> 1.12",
      elixirc_paths: elixirc_paths(Mix.env()),
      build_embedded: Mix.env() == :prod,
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      package: package(),
      aliases: aliases(),
      description: "The Elixir implementation of gRPC",
      docs: [
        extras: ["README.md"],
        main: "readme",
        source_ref: "v#{@version}",
        source_url: "https://github.com/elixir-grpc/grpc"
      ],
      xref: [exclude: [IEx]]
    ]
  end

  def application do
    [extra_applications: [:logger]]
  end

  def escript do
    [main_module: GRPC.Protoc.CLI, name: "protoc-gen-grpc_elixir"]
  end

  defp deps do
    [
      {:cowboy, "~> 2.10"},
      {:gun, "~> 2.0"},
      {:jason, ">= 0.0.0", optional: true},
      {:cowlib, "~> 2.12"},
      {:castore, "~> 0.1 or ~> 1.0", optional: true},
      {:protobuf, "~> 0.11"},
      {:protobuf_generate, "~> 0.1.1", only: [:dev, :test]},
      {:googleapis,
       github: "googleapis/googleapis",
       branch: "master",
       app: false,
       compile: false,
       only: [:dev, :test]},
      {:mint, "~> 1.5"},
      {:ex_doc, "~> 0.29", only: :dev},
      {:ex_parameterized, "~> 1.3.7", only: :test},
      {:telemetry, "~> 1.0"}
    ]
  end

  defp package do
    %{
      maintainers: ["Bing Han", "Paulo Valente"],
      licenses: ["Apache-2.0"],
      links: %{"GitHub" => "https://github.com/elixir-grpc/grpc"},
      files: ~w(mix.exs README.md lib src config priv/templates LICENSE .formatter.exs)
    }
  end

  defp aliases do
    [
      gen_bootstrap_protos: &gen_bootstrap_protos/1,
      gen_test_protos: [&gen_bootstrap_protos/1, &gen_test_protos/1]
    ]
  end

  defp elixirc_paths(:test), do: ["lib", "test/support"]
  defp elixirc_paths(_), do: ["lib"]

  defp gen_test_protos(_args) do
    api_src = Mix.Project.deps_paths().googleapis
    transcode_src = "test/support"

    protoc!(
      [
        "--include-path=#{api_src}",
        "--include-path=#{transcode_src}",
        "--plugins=ProtobufGenerate.Plugins.GRPCWithOptions"
      ],
      "./#{transcode_src}",
      ["test/support/transcode_messages.proto"]
    )
  end

  # https://github.com/elixir-protobuf/protobuf/blob/cdf3acc53f619866b4921b8216d2531da52ceba7/mix.exs#L140
  defp gen_bootstrap_protos(_args) do
    proto_src = Mix.Project.deps_paths().googleapis

    protoc!("--include-path=#{proto_src}", "./test/support", [
      "google/protobuf/descriptor.proto",
      "google/api/http.proto",
      "google/api/annotations.proto"
    ])
  end

  defp protoc!(args, elixir_out, files_to_generate) when is_list(args) do
    protoc!(Enum.join(args, " "), elixir_out, files_to_generate)
  end

  defp protoc!(args, elixir_out, files_to_generate)
       when is_binary(args) and is_binary(elixir_out) and is_list(files_to_generate) do
    args =
      [
        ~s(mix protobuf.generate),
        ~s(--output-path="#{elixir_out}"),
        args
      ] ++ files_to_generate

    case Mix.shell().cmd(Enum.join(args, " ")) do
      0 -> Mix.Task.rerun("format", [Path.join([elixir_out, "**", "*.pb.ex"])])
      other -> Mix.raise("'protoc' exited with non-zero status: #{other}")
    end
  end
end