# frozen_string_literal: true

require "metafiles"
require "formula"
require "cli/parser"

module Homebrew
  module_function

  def list_args
    Homebrew::CLI::Parser.new do
      usage_banner <<~EOS
        `list`, `ls` [<options>] [<formula>]

        List all installed formulae.

        If <formula> is provided, summarise the paths within its current keg.
      EOS
      switch "--full-name",
             description: "Print formulae with fully-qualified names. If `--full-name` is not "\
                          "passed, other options (i.e. `-1`, `-l`, `-r` and `-t`) are passed to `ls`(1) "\
                          "which produces the actual output."
      switch "--unbrewed",
             description: "List files in Homebrew's prefix not installed by Homebrew."
      switch "--versions",
             description: "Show the version number for installed formulae, or only the specified "\
                          "formulae if <formula> are provided."
      switch "--multiple",
             depends_on:  "--versions",
             description: "Only show formulae with multiple versions installed."
      switch "--pinned",
             description: "Show the versions of pinned formulae, or only the specified (pinned) "\
                          "formulae if <formula> are provided. See also `pin`, `unpin`."
      # passed through to ls
      switch "-1",
             description: "Force output to be one entry per line. " \
                          "This is the default when output is not to a terminal."
      switch "-l",
             description: "List in long format. If the output is to a terminal, "\
                          "a total sum for all the file sizes is printed before the long listing."
      switch "-r",
             description: "Reverse the order of the sort to list the oldest entries first."
      switch "-t",
             description: "Sort by time modified, listing most recently modified first."
      switch :verbose
      switch :debug
    end
  end

  def list
    list_args.parse

    return list_unbrewed if args.unbrewed?

    # Unbrewed uses the PREFIX, which will exist
    # Things below use the CELLAR, which doesn't until the first formula is installed.
    unless HOMEBREW_CELLAR.exist?
      raise NoSuchKegError, args.named.first if args.named.present?

      return
    end

    if args.pinned? || args.versions?
      filtered_list
    elsif args.no_named?
      if args.full_name?
        full_names = Formula.installed.map(&:full_name).sort(&tap_and_name_comparison)
        return if full_names.empty?

        puts Formatter.columns(full_names)
      else
        ENV["CLICOLOR"] = nil
        safe_system "ls", *args.passthrough << HOMEBREW_CELLAR
      end
    elsif args.verbose? || !$stdout.tty?
      system_command! "find", args: args.kegs.map(&:to_s) + %w[-not -type d -print], print_stdout: true
    else
      args.kegs.each { |keg| PrettyListing.new keg }
    end
  end

  UNBREWED_EXCLUDE_FILES = %w[.DS_Store].freeze
  UNBREWED_EXCLUDE_PATHS = %w[
    .github/*
    bin/brew
    completions/zsh/_brew
    docs/*
    lib/gdk-pixbuf-2.0/*
    lib/gio/*
    lib/node_modules/*
    lib/python[23].[0-9]/*
    lib/pypy/*
    lib/pypy3/*
    lib/ruby/gems/[12].*
    lib/ruby/site_ruby/[12].*
    lib/ruby/vendor_ruby/[12].*
    manpages/brew.1
    manpages/brew-cask.1
    share/pypy/*
    share/pypy3/*
    share/info/dir
    share/man/whatis
  ].freeze

  def list_unbrewed
    dirs  = HOMEBREW_PREFIX.subdirs.map { |dir| dir.basename.to_s }
    dirs -= %w[Library Cellar .git]

    # Exclude cache, logs, and repository, if they are located under the prefix.
    [HOMEBREW_CACHE, HOMEBREW_LOGS, HOMEBREW_REPOSITORY].each do |dir|
      dirs.delete dir.relative_path_from(HOMEBREW_PREFIX).to_s
    end
    dirs.delete "etc"
    dirs.delete "var"

    arguments = dirs.sort + %w[-type f (]
    arguments.concat UNBREWED_EXCLUDE_FILES.flat_map { |f| %W[! -name #{f}] }
    arguments.concat UNBREWED_EXCLUDE_PATHS.flat_map { |d| %W[! -path #{d}] }
    arguments.concat %w[)]

    cd HOMEBREW_PREFIX
    safe_system "find", *arguments
  end

  def filtered_list
    names = if args.no_named?
      Formula.racks
    else
      racks = args.named.map { |n| Formulary.to_rack(n) }
      racks.select do |rack|
        Homebrew.failed = true unless rack.exist?
        rack.exist?
      end
    end
    if args.pinned?
      pinned_versions = {}
      names.sort.each do |d|
        keg_pin = (HOMEBREW_PINNED_KEGS/d.basename.to_s)
        pinned_versions[d] = keg_pin.readlink.basename.to_s if keg_pin.exist? || keg_pin.symlink?
      end
      pinned_versions.each do |d, version|
        puts d.basename.to_s.concat(args.versions? ? " #{version}" : "")
      end
    else # --versions without --pinned
      names.sort.each do |d|
        versions = d.subdirs.map { |pn| pn.basename.to_s }
        next if args.multiple? && versions.length < 2

        puts "#{d.basename} #{versions * " "}"
      end
    end
  end
end

class PrettyListing
  def initialize(path)
    Pathname.new(path).children.sort_by { |p| p.to_s.downcase }.each do |pn|
      case pn.basename.to_s
      when "bin", "sbin"
        pn.find { |pnn| puts pnn unless pnn.directory? }
      when "lib"
        print_dir pn do |pnn|
          # dylibs have multiple symlinks and we don't care about them
          (pnn.extname == ".dylib" || pnn.extname == ".pc") && !pnn.symlink?
        end
      when ".brew"
        next # Ignore .brew
      else
        if pn.directory?
          if pn.symlink?
            puts "#{pn} -> #{pn.readlink}"
          else
            print_dir pn
          end
        elsif Metafiles.list?(pn.basename.to_s)
          puts pn
        end
      end
    end
  end

  def print_dir(root)
    dirs = []
    remaining_root_files = []
    other = ""

    root.children.sort.each do |pn|
      if pn.directory?
        dirs << pn
      elsif block_given? && yield(pn)
        puts pn
        other = "other "
      else
        remaining_root_files << pn unless pn.basename.to_s == ".DS_Store"
      end
    end

    dirs.each do |d|
      files = []
      d.find { |pn| files << pn unless pn.directory? }
      print_remaining_files files, d
    end

    print_remaining_files remaining_root_files, root, other
  end

  def print_remaining_files(files, root, other = "")
    if files.length == 1
      puts files
    elsif files.length > 1
      puts "#{root}/ (#{files.length} #{other}files)"
    end
  end
end
