# typed: false
# frozen_string_literal: true

require "completions"

describe Homebrew::Completions do
  let(:completions_dir) { HOMEBREW_REPOSITORY/"completions" }
  let(:internal_path) { HOMEBREW_REPOSITORY/"Library/Taps/homebrew/homebrew-bar" }
  let(:external_path) { HOMEBREW_REPOSITORY/"Library/Taps/foo/homebrew-bar" }

  before do
    HOMEBREW_REPOSITORY.cd do
      system "git", "init"
    end
    described_class::SHELLS.each do |shell|
      (completions_dir/shell).mkpath
    end
    internal_path.mkpath
    external_path.mkpath
  end

  after do
    FileUtils.rm_rf completions_dir
    FileUtils.rm_rf internal_path
    FileUtils.rm_rf external_path.dirname
  end

  context "when linking or unlinking completions" do
    def setup_completions(external:)
      (internal_path/"completions/bash/foo_internal").write "#foo completions"
      if external
        (external_path/"completions/bash/foo_external").write "#foo completions"
      elsif (external_path/"completions/bash/foo_external").exist?
        (external_path/"completions/bash/foo_external").delete
      end
    end

    def setup_completions_setting(state, setting: "linkcompletions")
      HOMEBREW_REPOSITORY.cd do
        system "git", "config", "--replace-all", "homebrew.#{setting}", state.to_s
      end
    end

    def read_completions_setting(setting: "linkcompletions")
      HOMEBREW_REPOSITORY.cd do
        Utils.popen_read("git", "config", "--get", "homebrew.#{setting}").chomp.presence
      end
    end

    def delete_completions_setting(setting: "linkcompletions")
      HOMEBREW_REPOSITORY.cd do
        system "git", "config", "--unset-all", "homebrew.#{setting}"
      end
    end

    describe ".link!" do
      it "sets homebrew.linkcompletions to true" do
        setup_completions_setting false
        expect { described_class.link! }.not_to raise_error
        expect(read_completions_setting).to eq "true"
      end

      it "sets homebrew.linkcompletions to true if unset" do
        delete_completions_setting
        expect { described_class.link! }.not_to raise_error
        expect(read_completions_setting).to eq "true"
      end

      it "keeps homebrew.linkcompletions set to true" do
        setup_completions_setting true
        expect { described_class.link! }.not_to raise_error
        expect(read_completions_setting).to eq "true"
      end
    end

    describe ".unlink!" do
      it "sets homebrew.linkcompletions to false" do
        setup_completions_setting true
        expect { described_class.unlink! }.not_to raise_error
        expect(read_completions_setting).to eq "false"
      end

      it "sets homebrew.linkcompletions to false if unset" do
        delete_completions_setting
        expect { described_class.unlink! }.not_to raise_error
        expect(read_completions_setting).to eq "false"
      end

      it "keeps homebrew.linkcompletions set to false" do
        setup_completions_setting false
        expect { described_class.unlink! }.not_to raise_error
        expect(read_completions_setting).to eq "false"
      end
    end

    describe ".link_completions?" do
      it "returns true if homebrew.linkcompletions is true" do
        setup_completions_setting true
        expect(described_class.link_completions?).to be true
      end

      it "returns false if homebrew.linkcompletions is false" do
        setup_completions_setting false
        expect(described_class.link_completions?).to be false
      end

      it "returns false if homebrew.linkcompletions is not set" do
        expect(described_class.link_completions?).to be false
      end
    end

    describe ".completions_to_link?" do
      it "returns false if only internal taps have completions" do
        setup_completions external: false
        expect(described_class.completions_to_link?).to be false
      end

      it "returns true if external taps have completions" do
        setup_completions external: true
        expect(described_class.completions_to_link?).to be true
      end
    end

    describe ".show_completions_message_if_needed" do
      it "doesn't show the message if there are no completions to link" do
        setup_completions external: false
        delete_completions_setting setting: :completionsmessageshown
        expect { described_class.show_completions_message_if_needed }.not_to output.to_stdout
      end

      it "doesn't show the message if there are completions to link but the message has already been shown" do
        setup_completions external: true
        setup_completions_setting true, setting: :completionsmessageshown
        expect { described_class.show_completions_message_if_needed }.not_to output.to_stdout
      end

      it "shows the message if there are completions to link and the message hasn't already been shown" do
        setup_completions external: true
        delete_completions_setting setting: :completionsmessageshown

        message = /Homebrew completions for external commands are unlinked by default!/
        expect { described_class.show_completions_message_if_needed }
          .to output(message).to_stdout
      end
    end
  end

  context "when generating completions" do
    describe ".update_shell_completions!" do
      it "generates shell completions" do
        described_class.update_shell_completions!
        expect(completions_dir/"bash/brew").to be_a_file
      end
    end

    describe ".command_options" do
      it "returns an array of options for a ruby command" do
        expected_options = %w[--debug --help --hide --quiet --verbose]
        expect(described_class.command_options("missing")).to eq expected_options
      end

      it "returns an array of options for a shell command" do
        expected_options = %w[--debug --force --help --merge --preinstall --verbose]
        expect(described_class.command_options("update")).to eq expected_options
      end

      it "handles --[no]- options correctly" do
        options = described_class.command_options("audit")
        expect(options.include?("--appcast")).to eq true
        expect(options.include?("--no-appcast")).to eq true
      end

      it "return an empty array if command is not found" do
        expect(described_class.command_options("foobar")).to eq []
      end

      it "return an empty array for a command with no options" do
        expect(described_class.command_options("help")).to eq []
      end

      it "will list global options only once if overriden" do
        count = 0
        described_class.command_options("upgrade").each do |opt|
          count += 1 if opt == "--verbose"
        end
        expect(count).to eq 1
      end
    end

    describe ".command_gets_completions?" do
      it "returns true for a non-cask command with options" do
        expect(described_class.command_gets_completions?("install")).to eq true
      end

      it "returns false for a non-cask command with no options" do
        expect(described_class.command_gets_completions?("help")).to eq false
      end

      it "returns false for a cask command" do
        expect(described_class.command_gets_completions?("cask install")).to eq false
      end
    end

    describe ".generate_bash_subcommand_completion" do
      it "returns nil if completions aren't needed" do
        expect(described_class.generate_bash_subcommand_completion("help")).to be_nil
      end

      it "returns appropriate completion for a ruby command" do
        completion = described_class.generate_bash_subcommand_completion("missing")
        expect(completion).to match(/^_brew_missing\(\) {/)
        expect(completion).to match(/__brewcomp "\n +--debug\n +--help\n +--hide\n +--quiet\n +--verbose/s)
        expect(completion).to match(/__brew_complete_formulae\n}$/)
      end

      it "returns appropriate completion for a shell command" do
        completion = described_class.generate_bash_subcommand_completion("update")
        options_regex = /__brewcomp "\n +--debug\n +--force\n +--help\n +--merge\n +--preinstall\n +--verbose/
        expect(completion).to match(/^_brew_update\(\) {/)
        expect(completion).to match(options_regex)
      end

      it "returns appropriate completion for a command with multiple named arg types" do
        completion = described_class.generate_bash_subcommand_completion("upgrade")
        expect(completion).to match(/__brew_complete_outdated_formulae\n  __brew_complete_outdated_casks\n}$/)
      end
    end

    describe ".generate_bash_completion_file" do
      it "returns the correct completion file" do
        file = described_class.generate_bash_completion_file(%w[install missing update])
        expect(file).to match(/^__brewcomp\(\) {$/)
        expect(file).to match(/^_brew_install\(\) {$/)
        expect(file).to match(/^_brew_missing\(\) {$/)
        expect(file).to match(/^_brew_update\(\) {$/)
        expect(file).to match(/^_brew\(\) {$/)
        expect(file).to match(/^ {4}install\) _brew_install ;;/)
        expect(file).to match(/^ {4}missing\) _brew_missing ;;/)
        expect(file).to match(/^ {4}update\) _brew_update ;;/)
        expect(file).to match(/^complete -o bashdefault -o default -F _brew brew$/)
      end
    end
  end
end