# frozen_string_literal: true

require "system_command"

module ChangedFiles
  # TODO: replace with public API like Utils.safe_popen_read that's less likely to be volatile to changes
  # see https://github.com/Homebrew/brew/pull/16540#issuecomment-1913737000
  include SystemCommand::Mixin

  def changed_files
    commit_range_start = system_command!("git", args: ["rev-parse", "origin"], chdir: path).stdout.chomp
    commit_range_end = system_command!("git", args: ["rev-parse", "HEAD"], chdir: path).stdout.chomp
    commit_range = "#{commit_range_start}...#{commit_range_end}"

    modified_files = system_command!(
      "git", args: ["diff", "--name-only", "--diff-filter=AMR", commit_range], chdir: path
    ).stdout.split("\n").map { |path| Pathname(path) }

    added_files = system_command!(
      "git", args: ["diff", "--name-only", "--diff-filter=A", commit_range], chdir: path
    ).stdout.split("\n").map { |path| Pathname(path) }

    modified_ruby_files = modified_files.select { |path| path.extname == ".rb" }
    modified_command_files = modified_files.select { |path| path.ascend.to_a.last.to_s == "cmd" }
    modified_github_actions_files = modified_files.select { |path| path.to_s.start_with?(".github/actions/") }
    modified_cask_files = modified_files.select { |path| cask_file?(path) }

    {
      modified_files:,
      added_files:,
      modified_ruby_files:,
      modified_command_files:,
      modified_github_actions_files:,
      modified_cask_files:,
    }
  end
end