class Bundler::Dsl

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

def add_git_sources
  git_source(:github) do |repo_name|
    # It would be better to use https instead of the git protocol, but this
    # can break deployment of existing locked bundles when switching between
    # different versions of Bundler. The change will be made in 2.0, which
    # does not guarantee compatibility with the 1.x series.
    #
    # See https://github.com/bundler/bundler/pull/2569 for discussion
    #
    # This can be overridden by adding this code to your Gemfiles:
    #
    #   git_source(:github) do |repo_name|
    #     repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
    #     "https://github.com/#{repo_name}.git"
    #   end
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
    "git://github.com/#{repo_name}.git"
  end
  git_source(:gist) {|repo_name| "https://gist.github.com/#{repo_name}.git" }
  git_source(:bitbucket) do |repo_name|
    user_name, repo_name = repo_name.split "/"
    repo_name ||= user_name
    "https://#{user_name}@bitbucket.org/#{user_name}/#{repo_name}.git"
  end
end

def check_primary_source_safety(source)
  return unless source.rubygems_primary_remotes.any?
  if Bundler.settings[:disable_multisource]
    raise GemspecError, "Warning: this Gemfile contains multiple primary sources. " \
      "Each source after the first must include a block to indicate which gems " \
      "should come from that source. To downgrade this error to a warning, run " \
      "`bundle config --delete disable_multisource`"
  else
    Bundler.ui.warn "Warning: this Gemfile contains multiple primary sources. " \
      "Using `source` more than once without a block is a security risk, and " \
      "may result in installing unexpected gems. To resolve this warning, use " \
      "a block to indicate which gems should come from the secondary source. " \
      "To upgrade this warning to an error, run `bundle config " \
      "disable_multisource true`."
  end
end

def env(name)
  old = @env
  @env = name
  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 Exception => e
  message = "There was an error " \
    "#{e.is_a?(GemfileEvalError) ? "evaluating" : "parsing"} " \
    "`#{File.basename gemfile.to_s}`: #{e.message}"
  raise DSLError.new(message, gemfile, e.backtrace, contents)
end

def gem(name, *args)
  options = args.last.is_a?(Hash) ? args.pop.dup : {}
  version = args || [">= 0"]
  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] || "."
  glob              = opts && opts[:glob]
  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)
    unless spec
      raise InvalidOption, "There was an error loading the gemspec at " \
        "#{file}. Make sure you can build the gem, then try again"
    end
    gem spec.name, :path => path, :glob => glob, :platforms => Bundler::Dependency::REVERSE_PLATFORM_MAP[spec.platform]
    group(development_group) do
      spec.development_dependencies.each do |dep|
        gem dep.name, *(dep.requirement.as_list + [:type => :development])
      end
    end
    @gemspecs << gemspecs.first
  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 should be used"
  end
end

def git(uri, 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
  with_source(@sources.add_git_source(normalize_hash(options).merge("uri" => uri)), &blk)
end

def git_source(name, &block)
  unless block_given?
    raise InvalidOption, "You need to pass a block to #git_source"
  end
  if valid_keys.include?(name.to_s)
    raise InvalidOption, "You cannot use #{name} as a git source. It " \
      "is a reserved key. Reserved keys are: #{valid_keys.join(", ")}"
  end
  @git_sources[name.to_s] = block
end

def github(repo, options = {})
  raise ArgumentError, "Github sources require a block" unless block_given?
  github_uri  = @git_sources["github"].call(repo)
  git_options = normalize_hash(options).merge("uri" => github_uri)
  git_source  = @sources.add_git_source(git_options)
  with_source(git_source) { yield }
end

def group(*args, &blk)
  opts = Hash === args.last ? args.pop.dup : {}
  normalize_group_options(opts, args)
  @groups.concat args
  if opts["optional"]
    optional_groups = args - @optional_groups
    @optional_groups.concat optional_groups
  end
  yield
ensure
  args.each { @groups.pop }
end

def initialize
  @source               = nil
  @sources              = SourceList.new
  @git_sources          = {}
  @dependencies         = []
  @groups               = []
  @install_conditionals = []
  @optional_groups      = []
  @platforms            = []
  @env                  = nil
  @ruby_version         = nil
  @gemspecs             = []
  add_git_sources
end

def install_if(*args, &blk)
  @install_conditionals.concat args
  blk.call
ensure
  args.each { @install_conditionals.pop }
end

def method_missing(name, *args)
  raise GemfileError, "Undefined local variable or method `#{name}' for Gemfile"
end

def normalize_group_options(opts, groups)
  normalize_hash(opts)
  groups = groups.map {|group| ":#{group}" }.join(", ")
  validate_keys("group #{groups}", opts, %w(optional))
  opts["optional"] ||= false
end

def normalize_hash(opts)
  opts.keys.each do |k|
    opts[k.to_s] = opts.delete(k) unless k.is_a?(String)
  end
  opts
end

def normalize_options(name, version, opts)
  if name.is_a?(Symbol)
    raise GemfileError, %(You need to specify gem names as Strings. Use 'gem "#{name}"' instead)
  end
  if name =~ /\s/
    raise GemfileError, %('#{name}' is not a valid gem name because it contains whitespace)
  end
  normalize_hash(opts)
  git_names = @git_sources.keys.map(&:to_s)
  validate_keys("gem '#{name}'", opts, valid_keys + git_names)
  groups = @groups.dup
  opts["group"] = opts.delete("groups") || opts["group"]
  groups.concat Array(opts.delete("group"))
  groups = [:default] if groups.empty?
  install_if = @install_conditionals.dup
  install_if.concat Array(opts.delete("install_if"))
  install_if = install_if.reduce(true) do |memo, val|
    memo && (val.respond_to?(:call) ? val.call : val)
  end
  platforms = @platforms.dup
  opts["platforms"] = opts["platform"] || opts["platforms"]
  platforms.concat Array(opts.delete("platforms"))
  platforms.map!(&: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
  # Save sources passed in a key
  if opts.key?("source")
    source = normalize_source(opts["source"])
    opts["source"] = @sources.add_rubygems_source("remotes" => source)
  end
  git_name = (git_names & opts.keys).last
  if @git_sources[git_name]
    opts["git"] = @git_sources[git_name].call(opts[git_name])
  end
  %w(git path).each do |type|
    next unless 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) {}
    opts["source"] = source
  end
  opts["source"] ||= @source
  opts["env"] ||= @env
  opts["platforms"]      = platforms.dup
  opts["group"]          = groups
  opts["should_include"] = install_if
end

def normalize_source(source)
  case source
  when :gemcutter, :rubygems, :rubyforge
    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."
    "http://rubygems.org"
  when String
    source
  else
    raise GemfileError, "Unknown source '#{source}'"
  end
end

def path(path, options = {}, &blk)
  with_source(@sources.add_path_source(normalize_hash(options).merge("path" => Pathname.new(path))), &blk)
end

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

def source(source, &blk)
  source = normalize_source(source)
  if block_given?
    with_source(@sources.add_rubygems_source("remotes" => source), &blk)
  else
    check_primary_source_safety(@sources)
    @sources.add_rubygems_remote(source)
  end
end

def to_definition(lockfile, unlock)
  Definition.new(lockfile, @dependencies, @sources, unlock, @ruby_version, @optional_groups)
end

def valid_keys
  @valid_keys ||= %w(group groups git path glob name branch ref tag require submodules platform platforms type source install_if)
end

def validate_keys(command, opts, valid_keys)
  invalid_keys = opts.keys - valid_keys
  if invalid_keys.any?
    message = "You passed #{invalid_keys.map {|k| ":" + k }.join(", ")} "
    message << if invalid_keys.size > 1
                 "as options for #{command}, but they are invalid."
               else
                 "as an option for #{command}, but it is invalid."
               end
    message << " Valid options are: #{valid_keys.join(", ")}"
    raise InvalidOption, message
  end
end

def with_source(source)
  old_source = @source
  if block_given?
    @source = source
    yield
  end
  source
ensure
  @source = old_source
end