defmodule Gjallar.MixProject do
  use Mix.Project

  def project do
    [
      app: :gjallar,
      version: version_from_env_or_git(),
      elixir: "~> 1.18",
      coveralls: [mininum_coverage: 100],
      start_permanent: Mix.env() == :prod,
      deps: deps(),
      test_coverage: [tool: ExCoveralls],
      preferred_cli_env: [
        coveralls: :test,
        "coveralls.html": :test,
        "coveralls.json": :test,
        "gjallar.test": :test,
        # gjallar tasks
        gjallar: :test,
        "gjallar.test": :test,
        "gjallar.format": :dev,
        "gjallar.credo": :dev,
        # credo native task (if users run it directly)
        credo: :dev
      ],
      description: "Opinionated CI helper: deps, compile, format, tests, coverage gate",
      package: [
        licenses: ["MIT"],
        links: %{"GitHub" => "https://github.com/kstatz12/gjallar"}
      ],
      docs: [main: "readme", extras: ["README.md"]]
    ]
  end

  # Run "mix help compile.app" to learn about applications.
  def application do
    [
      extra_applications: [:logger, :tools]
    ]
  end

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [
      {:excoveralls, "~> 0.18", only: [:dev, :test], runtime: false},
      {:credo, "~> 1.7", only: [:dev, :test], runtime: false, optional: true},
      {:ex_doc, "~> 0.34", only: :dev, runtime: false}
    ]
  end

  defp version_from_env_or_git do
    # Prefer CI-provided env
    case System.get_env("PROJECT_VERSION") do
      nil ->
        git_tag_version()

      v ->
        normalize(v)
    end
  end

  defp git_tag_version do
    # Works if tags are fetched (see checkout step below)
    case System.cmd("git", ["describe", "--tags", "--abbrev=0"]) do
      {tag, 0} -> normalize(String.trim(tag))
      # sane fallback for e.g. source tarballs without .git
      _ -> "0.0.0"
    end
  end

  defp normalize(tag) do
    tag |> String.trim_leading("v") |> String.trim()
  end
end