defmodule SvExNew.MixProject do
  use Mix.Project

  # `.version` is the single source of truth, spelled the way the parent repo
  # spells its own. This archive's version is INDEPENDENT of sv_ex's: the two
  # ship as separate packages on separate cadences, and the root
  # `scripts/bump_version.exs` bumps THIS file only for commits that touch a path
  # under `installer/sv_ex_new/`. A commit confined to the hex package leaves it
  # alone, so the two numbers accumulate at their own rates and are meant to.
  #
  # Resolved against __DIR__, never a bare ".version". A relative read resolves
  # against the CURRENT WORKING DIRECTORY, which is this project's root only by
  # convention — it is not when the root suite shells in from one directory up,
  # which is exactly how this project is built and tested.
  @version_path Path.join(__DIR__, ".version")
  @external_resource @version_path
  @version @version_path |> File.read!() |> String.trim()

  # Hex REFUSES to build without `links` -- "Missing metadata fields: links" --
  # so this is not optional metadata.
  #
  # It points at the PARENT repository, not at an `sv_ex_new` repository of its
  # own: this directory is a nested build target inside sv_ex, not a separate
  # checkout. Two hex packages, one repository -- README.md, "One project, two
  # outputs": "no second product, no second repository and no second roadmap".
  # The project this was ported from split the two across repositories and had
  # to gitignore one inside the other; that is the arrangement being dropped,
  # not copied.
  @source_url "https://github.com/wimwian-org/sv_ex"
  @description "Zero-dependency bootstrap archive for SvEx projects."

  def project do
    [
      app: :sv_ex_new,
      version: @version,
      elixir: "~> 1.20",
      elixirc_paths: elixirc_paths(Mix.env()),
      deps: deps(),
      description: @description,
      package: package(),
      test_coverage: [tool: ExCoveralls],
      dialyzer: [plt_add_apps: [:mix]],
      docs: [main: "readme", extras: ["README.md"]]
    ]
  end

  def cli do
    [preferred_envs: [coveralls: :test, "coveralls.json": :test]]
  end

  # Deliberately empty, so the shipped .app declares exactly
  # [:kernel, :stdlib, :elixir] — the archive's zero-dependency claim, asserted
  # by the root suite's archive_test.exs.
  #
  # `extra_applications: [:eex]` would be the intuitive addition, because the
  # generators this task delegates to (`mix new`, `mix phx.new`) render their
  # templates through EEx. It is not needed and is not harmless: it appends
  # :eex to `applications` and breaks that assertion. `extra_applications`
  # governs release inclusion and application start order, NOT code-path
  # availability — :eex ships with Elixir and its ebin is already on the path
  # for any in-process `Mix.Task.run/2`.
  def application, do: []

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

  # `files` is spelled out only because `.version` is not one of hex's defaults,
  # and mix.exs reads it at build time — a package without it builds here and
  # fails to compile for the consumer. Everything else in the list is what the
  # default would have included anyway.
  #
  defp package do
    [
      description: @description,
      licenses: ["MIT"],
      links: %{"GitHub" => @source_url},
      files: ~w(.version lib mix.exs README.md .formatter.exs)
    ]
  end

  # RULE: every dep MUST carry an `only:` that EXCLUDES :prod.
  #
  # `runtime: false` is NOT the discriminator — {:jason, "~> 1.4",
  # runtime: false} with no `only:` still emits a full entry in the package's
  # `requirements`, and this archive's whole point is having none.
  #
  # A dep with `only: [:dev, :test]` and the default `runtime: true` also leaks
  # into the shipped .app's `applications` list while shipping zero BEAMs —
  # which is why the tooling deps below carry `runtime: false` as well.
  defp deps do
    [
      {:credo, "~> 1.7", only: [:dev, :test], runtime: false},
      {:dialyxir, "~> 1.4", only: [:dev, :test], runtime: false},
      {:doctor, "~> 0.21", only: [:dev, :test], runtime: false},
      {:ex_doc, "~> 0.34", only: :dev, runtime: false},
      {:excoveralls, "~> 0.18", only: :test, runtime: false},
      {:ex_machina, "~> 2.8", only: :test, runtime: false},
      {:faker, "~> 0.18", only: :test, runtime: false}
    ]
  end
end