require 'formula'
require 'tab'
require 'keg'
require 'caveats'
require 'blacklist'
require 'utils/json'

module Homebrew extend self
  def info
    # eventually we'll solidify an API, but we'll keep old versions
    # awhile around for compatibility
    if ARGV.json == "v1"
      print_json
    elsif ARGV.flag? '--github'
      exec_browser(*ARGV.formulae.map { |f| github_info(f) })
    else
      print_info
    end
  end

  def print_info
    if ARGV.named.empty?
      if HOMEBREW_CELLAR.exist?
        puts "#{HOMEBREW_CELLAR.children.length} kegs, #{HOMEBREW_CELLAR.abv}"
      end
    else
      ARGV.named.each_with_index do |f,i|
        puts unless i == 0
        begin
          info_formula Formula.factory(f)
        rescue FormulaUnavailableError
          # No formula with this name, try a blacklist lookup
          if (blacklist = blacklisted?(f))
            puts blacklist
          else
            raise
          end
        end
      end
    end
  end

  def print_json
    formulae = ARGV.include?("--all") ? Formula : ARGV.formulae
    json = formulae.map {|f| f.to_hash}
    if json.size == 1
      puts Utils::JSON.dump(json.pop)
    else
      puts Utils::JSON.dump(json)
    end
  end

  def github_fork
    if which 'git' and (HOMEBREW_REPOSITORY/".git").directory?
      if `git remote -v` =~ %r{origin\s+(https?://|git(?:@|://))github.com[:/](.+)/homebrew}
        $2
      end
    end
  end

  def github_info f
    if f.path.to_s =~ HOMEBREW_TAP_PATH_REGEX
      user = $1
      repo = $2
      path = $3
    else
      user = f.path.parent.cd { github_fork }
      repo = "homebrew"
      path = "Library/Formula/#{f.path.basename}"
    end

    "https://github.com/#{user}/#{repo}/commits/master/#{path}"
  end

  def info_formula f
    specs = []

    if stable = f.stable
      s = "stable #{stable.version}"
      s += " (bottled)" if stable.bottled?
      specs << s
    end

    if devel = f.devel
      s = "devel #{devel.version}"
      s += " (bottled)" if devel.bottled?
      specs << s
    end

    specs << "HEAD" if f.head

    puts "#{f.name}: #{specs*', '}#{' (pinned)' if f.pinned?}"

    puts f.homepage

    if f.keg_only?
      puts
      puts "This formula is keg-only."
      puts f.keg_only_reason
      puts
    end

    conflicts = f.conflicts.map(&:name).sort!
    puts "Conflicts with: #{conflicts*', '}" unless conflicts.empty?

    if f.rack.directory?
      kegs = f.rack.subdirs.map { |keg| Keg.new(keg) }.sort_by(&:version)
      kegs.each do |keg|
        puts "#{keg} (#{keg.abv})#{' *' if keg.linked?}"
        tab = Tab.for_keg(keg).to_s
        puts "  #{tab}" unless tab.empty?
      end
    else
      puts "Not installed"
    end

    history = github_info(f)
    puts "From: #{history}" if history

    unless f.deps.empty?
      ohai "Dependencies"
      %w{build required recommended optional}.map do |type|
        deps = f.deps.send(type)
        puts "#{type.capitalize}: #{decorate_dependencies deps}" unless deps.empty?
      end
    end

    unless f.build.empty?
      require 'cmd/options'
      ohai "Options"
      Homebrew.dump_options_for_formula f
    end

    c = Caveats.new(f)
    ohai 'Caveats', c.caveats unless c.empty?
  end

  def decorate_dependencies dependencies
    # necessary for 1.8.7 unicode handling since many installs are on 1.8.7
    tick = ["2714".hex].pack("U*")
    cross = ["2718".hex].pack("U*")

    deps_status = dependencies.collect do |dep|
      if dep.installed?
        color = Tty.green
        symbol = tick
      else
        color = Tty.red
        symbol = cross
      end
      if ENV['HOMEBREW_NO_EMOJI']
        colored_dep = "#{color}#{dep}"
      else
        colored_dep = "#{dep} #{color}#{symbol}"
      end
      "#{colored_dep}#{Tty.reset}"
    end
    deps_status * ", "
  end
end