class Bundler::Dsl

def self.evaluate(environment, file)
  builder = new(environment)
  builder.instance_eval(File.read(file.to_s), file.to_s, 1)
end

def _combine_except(except)
  return @except unless except
  except = Array(except).compact.uniq.map { |o| o.to_s }
  except |= @except if @except
  except
end

def _combine_only(only)
  return @only unless only
  only = Array(only).compact.uniq.map { |o| o.to_s }
  only &= @only if @only
  only
end

def _find_directory_source(path)
  if @directory
    return @directory, Pathname.new(path || '')
  end
  path = @environment.filename.dirname.join(path)
  @directory_sources.each do |s|
    if s.location.expand_path.to_s < path.expand_path.to_s
      return s, path.relative_path_from(s.location)
    end
  end
  nil
end

def _handle_git_option(name, version, options)
  git    = options[:git].to_s
  ref    = options[:commit] || options[:tag]
  branch = options[:branch]
  if source = @git || @git_sources[git]
    if ref && source.ref != ref
      raise GitSourceError, "'#{git}' already specified with ref: #{source.ref}"
    elsif branch && source.branch != branch
      raise GitSourceError, "'#{git}' already specified with branch: #{source.branch}"
    end
    source.required_specs << name
    source.add_spec(Pathname.new(options[:path] || '.'), name, version) if version
  else
    git(git, :ref => ref, :branch => branch) do
      _handle_git_option(name, version, options)
    end
  end
end

def _handle_vendored_option(name, version, options)
  dir, path = _find_directory_source(options[:path])
  if dir
    dir.required_specs << name
    dir.add_spec(path, name, version) if version
  else
    directory options[:path] do
      _handle_vendored_option(name, version, {})
    end
  end
end

def bin_path(path)
  path = Pathname.new(path)
  @environment.bindir = (path.relative? ?
    @environment.root.join(path) : path).expand_path
end

def bundle_path(path)
  path = Pathname.new(path)
  @environment.gem_path = (path.relative? ?
    @environment.root.join(path) : path).expand_path
end

def clear_sources
  @environment.clear_sources
end

def directory(path, options = {})
  raise DirectorySourceError, "cannot nest calls to directory or git" if @directory || @git
  @directory = DirectorySource.new(options.merge(:location => path))
  @directory_sources << @directory
  @environment.add_priority_source(@directory)
  yield if block_given?
  @directory = nil
end

def disable_rubygems
  @environment.rubygems = false
end

def disable_system_gems
  @environment.system_gems = false
end

def except(*env)
  old, @except = @except, _combine_except(env)
  yield
  @except = old
end

def gem(name, *args)
  options = args.last.is_a?(Hash) ? args.pop : {}
  version = args.last
  if path = options.delete(:vendored_at)
    options[:path] = path
    warn "The :vendored_at option is deprecated. Use :path instead.\nFrom #{caller[0]}"
  end
  options[:only] = _combine_only(options[:only] || options["only"])
  options[:except] = _combine_except(options[:except] || options["except"])
  dep = Dependency.new(name, options.merge(:version => version))
  if options.key?(:bundle) && !options[:bundle]
    # We're using system gems for this one
  elsif @git || options[:git]
    _handle_git_option(name, version, options)
  elsif @directory || options[:path]
    _handle_vendored_option(name, version, options)
  end
  @environment.dependencies << dep
end

def git(uri, options = {})
  raise DirectorySourceError, "cannot nest calls to directory or git" if @directory || @git
  @git = GitSource.new(options.merge(:uri => uri))
  @git_sources[uri] = @git
  @environment.add_priority_source(@git)
  yield if block_given?
  @git = nil
end

def initialize(environment)
  @environment = environment
  @directory_sources = []
  @git_sources = {}
  @only, @except, @directory, @git = nil, nil, nil, nil
end

def only(*env)
  old, @only = @only, _combine_only(env)
  yield
  @only = old
end

def source(source)
  source = GemSource.new(:uri => source)
  unless @environment.sources.include?(source)
    @environment.add_source(source)
  end
end