require "tap"
require "cli/parser"

module Homebrew
  module_function

  def tap_new_args
    Homebrew::CLI::Parser.new do
      usage_banner <<~EOS
        `tap-new` <user>`/`<repo>

        Generate the template files for a new tap.
      EOS
      switch :verbose
      switch :debug
    end
  end

  def tap_new
    tap_new_args.parse

    raise "A tap argument is required" if ARGV.named.empty?

    tap = Tap.fetch(ARGV.named.first)
    titleized_user = tap.user.dup
    titleized_repo = tap.repo.dup
    titleized_user[0] = titleized_user[0].upcase
    titleized_repo[0] = titleized_repo[0].upcase

    (tap.path/"Formula").mkpath

    readme = <<~MARKDOWN
      # #{titleized_user} #{titleized_repo}

      ## How do I install these formulae?
      `brew install #{tap}/<formula>`

      Or `brew tap #{tap}` and then `brew install <formula>`.

      Or install via URL (which will not receive updates):

      ```
      brew install https://raw.githubusercontent.com/#{tap.user}/homebrew-#{tap.repo}/master/Formula/<formula>.rb
      ```

      ## Documentation
      `brew help`, `man brew` or check [Homebrew's documentation](https://docs.brew.sh).
    MARKDOWN
    write_path(tap, "README.md", readme)

    azure = <<~YAML
      jobs:
      - job: macOS
        pool:
          vmImage: macOS-10.13
        steps:
          - bash: |
              set -e
              sudo xcode-select --switch /Applications/Xcode_10.1.app/Contents/Developer
              brew update
              HOMEBREW_TAP_DIR="/usr/local/Homebrew/Library/Taps/#{tap.full_name}"
              mkdir -p "$HOMEBREW_TAP_DIR"
              rm -rf "$HOMEBREW_TAP_DIR"
              ln -s "$PWD" "$HOMEBREW_TAP_DIR"
              brew test-bot
            displayName: Run brew test-bot
    YAML
    write_path(tap, "azure-pipelines.yml", azure)
    ohai "Created #{tap}"
    puts tap.path.to_s
  end

  def write_path(tap, filename, content)
    path = tap.path/filename
    tap.path.mkpath
    raise "#{path} already exists" if path.exist?

    path.write content
  end
end