class Bundler::Dsl

def self.evaluate(gemfile, lockfile, unlock)
  builder = new
  builder.eval_gemfile(gemfile)
  builder.to_definition(lockfile, unlock)
end

def _normalize_hash(opts)
  # Cannot modify a hash during an iteration in 1.9
  opts.keys.each do |k|
    next if String === k
    v = opts[k]
    opts.delete(k)
    opts[k.to_s] = v
  end
  opts
end

def _normalize_options(name, version, opts)
  _normalize_hash(opts)
  valid_keys = %w(group groups git gist github path name branch ref tag require submodules platform platforms type)
  invalid_keys = opts.keys - valid_keys
  if invalid_keys.any?
    plural = invalid_keys.size > 1
    message = "You passed #{invalid_keys.map{|k| ':'+k }.join(", ")} "
    if plural
      message << "as options for gem '#{name}', but they are invalid."
    else
      message << "as an option for gem '#{name}', but it is invalid."
    end
    message << " Valid options are: #{valid_keys.join(", ")}"
    raise InvalidOption, message
  end
  groups = @groups.dup
  opts["group"] = opts.delete("groups") || opts["group"]
  groups.concat Array(opts.delete("group"))
  groups = [:default] if groups.empty?
  platforms = @platforms.dup
  opts["platforms"] = opts["platform"] || opts["platforms"]
  platforms.concat Array(opts.delete("platforms"))
  platforms.map! { |p| p.to_sym }
  platforms.each do |p|
    next if VALID_PLATFORMS.include?(p)
    raise GemfileError, "`#{p}` is not a valid platform. The available options are: #{VALID_PLATFORMS.inspect}"
  end
  if github = opts.delete("github")
    github = "#{github}/#{github}" unless github.include?("/")
    opts["git"] = "git://github.com/#{github}.git"
  end
  if gist = opts.delete("gist")
    opts["git"] = "https://gist.github.com/#{gist}.git"
  end
  ["git", "path"].each do |type|
    if param = opts[type]
      if version.first && version.first =~ /^\s*=?\s*(\d[^\s]*)\s*$/
        options = opts.merge("name" => name, "version" => $1)
      else
        options = opts.dup
      end
      source = send(type, param, options, :prepend => true) {}
      opts["source"] = source
    end
  end
  opts["source"]  ||= @source
  opts["env"]     ||= @env
  opts["platforms"] = platforms.dup
  opts["group"]     = groups
end

def env(name)
  @env, old = name, @env
  yield
ensure
  @env = old
end

def eval_gemfile(gemfile, contents = nil)
  contents ||= Bundler.read_file(gemfile.to_s)
  instance_eval(contents, gemfile.to_s, 1)
rescue SyntaxError => e
  bt = e.message.split("\n")[1..-1]
  raise GemfileError, ["Gemfile syntax error:", *bt].join("\n")
rescue ScriptError, RegexpError, NameError, ArgumentError => e
  e.backtrace[0] = "#{e.backtrace[0]}: #{e.message} (#{e.class})"
  Bundler.ui.warn e.backtrace.join("\n       ")
  raise GemfileError, "There was an error in your Gemfile," \
    " and Bundler cannot continue."
end

def gem(name, *args)
  if name.is_a?(Symbol)
    raise GemfileError, %{You need to specify gem names as Strings. Use 'gem "#{name.to_s}"' instead.}
  end
  options = Hash === args.last ? args.pop.dup : {}
  version = args
  _normalize_options(name, version, options)
  dep = Dependency.new(name, version, options)
  # if there's already a dependency with this name we try to prefer one
  if current = @dependencies.find { |d| d.name == dep.name }
    if current.requirement != dep.requirement
      if current.type == :development
        @dependencies.delete current
      elsif dep.type == :development
        return
      else
        raise GemfileError, "You cannot specify the same gem twice with different version requirements.\n" \
                        "You specified: #{current.name} (#{current.requirement}) and #{dep.name} (#{dep.requirement})"
      end
    else
      Bundler.ui.warn "Your Gemfile lists the gem #{current.name} (#{current.requirement}) more than once.\n" \
                      "You should probably keep only one of them.\n" \
                      "While it's not a problem now, it could cause errors if you change the version of just one of them later."
    end
    if current.source != dep.source
      if current.type == :development
        @dependencies.delete current
      elsif dep.type == :development
        return
      else
        raise GemfileError, "You cannot specify the same gem twice coming from different sources.\n" \
                        "You specified that #{dep.name} (#{dep.requirement}) should come from " \
                        "#{current.source || 'an unspecified source'} and #{dep.source}\n"
      end
    end
  end
  @dependencies << dep
end

def gemspec(opts = nil)
  path              = opts && opts[:path] || '.'
  name              = opts && opts[:name] || '{,*}'
  development_group = opts && opts[:development_group] || :development
  expanded_path     = File.expand_path(path, Bundler.default_gemfile.dirname)
  gemspecs = Dir[File.join(expanded_path, "#{name}.gemspec")]
  case gemspecs.size
  when 1
    spec = Bundler.load_gemspec(gemspecs.first)
    raise InvalidOption, "There was an error loading the gemspec at #{gemspecs.first}." unless spec
    gem spec.name, :path => path
    group(development_group) do
      spec.development_dependencies.each do |dep|
        gem dep.name, *(dep.requirement.as_list + [:type => :development])
      end
    end
  when 0
    raise InvalidOption, "There are no gemspecs at #{expanded_path}."
  else
    raise InvalidOption, "There are multiple gemspecs at #{expanded_path}. Please use the :name option to specify which one."
  end
end

def git(uri, options = {}, source_options = {}, &blk)
  unless block_given?
    msg = "You can no longer specify a git source by itself. Instead, \n" \
          "either use the :git option on a gem, or specify the gems that \n" \
          "bundler should find in the git source by passing a block to \n" \
          "the git method, like: \n\n" \
          "  git 'git://github.com/rails/rails.git' do\n" \
          "    gem 'rails'\n" \
          "  end"
    raise DeprecatedError, msg
  end
  source Source::Git.new(_normalize_hash(options).merge("uri" => uri)), source_options, &blk
end

def group(*args, &blk)
  @groups.concat args
  yield
ensure
  args.each { @groups.pop }
end

def initialize
  @rubygems_source = Source::Rubygems.new
  @source          = nil
  @sources         = []
  @dependencies    = []
  @groups          = []
  @platforms       = []
  @env             = nil
  @ruby_version    = nil
end

def method_missing(name, *args)
  location = caller[0].split(':')[0..1].join(':')
  raise GemfileError, "Undefined local variable or method `#{name}' for Gemfile\n" \
    "        from #{location}"
end

def path(path, options = {}, source_options = {}, &blk)
  source Source::Path.new(_normalize_hash(options).merge("path" => Pathname.new(path))), source_options, &blk
end

def platforms(*platforms)
  @platforms.concat platforms
  yield
ensure
  platforms.each { @platforms.pop }
end

def source(source, options = {})
  case source
  when :gemcutter, :rubygems, :rubyforge then
    Bundler.ui.warn "The source :#{source} is deprecated because HTTP " \
      "requests are insecure.\nPlease change your source to 'https://" \
      "rubygems.org' if possible, or 'http://rubygems.org' if not."
    @rubygems_source.add_remote "http://rubygems.org"
    return
  when String
    @rubygems_source.add_remote source
    return
  else
    @source = source
    if options[:prepend]
      @sources = [@source] | @sources
    else
      @sources = @sources | [@source]
    end
    yield if block_given?
    return @source
  end
ensure
  @source = nil
end

def to_definition(lockfile, unlock)
  @sources << @rubygems_source unless @sources.include?(@rubygems_source)
  Definition.new(lockfile, @dependencies, @sources, unlock, @ruby_version)
end