class Bundler::Runtime

def actual_dependencies
  @definition.actual_dependencies
end

def autorequires_for_groups(*groups)
  groups.map! { |g| g.to_sym }
  autorequires = Hash.new { |h,k| h[k] = [] }
  ordered_deps = []
  specs_for(*groups).each do |g|
    dep = @definition.dependencies.find{|d| d.name == g.name }
    ordered_deps << dep if dep && !ordered_deps.include?(dep)
  end
  ordered_deps.each do |dep|
    dep.groups.each do |group|
      # If there is no autorequire, then rescue from
      # autorequiring the gems name
      if dep.autorequire
        dep.autorequire.each do |file|
          autorequires[group] << [file, true]
        end
      else
        autorequires[group] << [dep.name, false]
      end
    end
  end
  if groups.empty?
    autorequires
  else
    groups.inject({}) { |h,g| h[g] = autorequires[g]; h }
  end
end

def cache
  cache_path = "#{root}/vendor/cache/"
  FileUtils.mkdir_p(cache_path)
  Bundler.ui.info "Copying .gem files into vendor/cache"
  specs.each do |spec|
    next unless spec.source.is_a?(Source::SystemGems) || spec.source.is_a?(Source::Rubygems)
    possibilities = Gem.path.map { |p| "#{p}/cache/#{spec.full_name}.gem" }
    cached_path = possibilities.find { |p| File.exist? p }
    raise GemNotFound, "Missing gem file '#{spec.full_name}.gem'." unless cached_path
    Bundler.ui.info "  * #{File.basename(cached_path)}"
    next if File.expand_path(File.dirname(cached_path)) == File.expand_path(cache_path)
    FileUtils.cp(cached_path, cache_path)
  end
end

def dependencies
  @definition.dependencies
end

def dependencies_for(*groups)
  if groups.empty?
    dependencies
  else
    dependencies.select { |d| (groups & d.groups).any? }
  end
end

def details
  details = {}
  details["hash"] = gemfile_fingerprint
  details["sources"] = sources.map { |s| { s.class.name.split("::").last => s.options} }
  details["specs"] = specs.map do |s|
    options = {"version" => s.version.to_s}
    options["source"] = sources.index(s.source) if sources.include?(s.source)
    { s.name => options }
  end
  details["dependencies"] = @definition.dependencies.inject({}) do |h,d|
    info = {"version" => d.requirement.to_s, "group" => d.groups}
    info.merge!("require" => d.autorequire) if d.autorequire
    h.merge(d.name => info)
  end
  details
end

def gemfile_fingerprint
  Digest::SHA1.hexdigest(File.read("#{root}/Gemfile"))
end

def index
  @definition.local_index
end

def initialize(*)
  super
  if locked?
    write_rb_lock
  end
end

def load_paths
  specs.map { |s| s.load_paths }.flatten
end

def lock
  Bundler.ui.info("The bundle is already locked, relocking.") if locked?
  sources.each { |s| s.lock if s.respond_to?(:lock) }
  FileUtils.mkdir_p("#{root}/.bundle")
  write_yml_lock
  write_rb_lock
  Bundler.ui.info("The bundle is now locked. Use `bundle show` to list the gems in the environment.")
end

def locked?
  File.exist?("#{root}/Gemfile.lock") || File.exist?("#{root}/.bundle/environment.rb")
end

def rb_lock_file
  root.join(".bundle/environment.rb")
end

def require(*groups)
  groups.map! { |g| g.to_sym }
  groups = [:default] if groups.empty?
  autorequires = autorequires_for_groups(*groups)
  groups.each do |group|
    (autorequires[group] || [[]]).each do |path, explicit|
      if explicit
        Kernel.require(path)
      else
        begin
          Kernel.require(path)
        rescue LoadError
        end
      end
    end
  end
end

def setup(*groups)
  # Has to happen first
  clean_load_path
  specs = specs_for(*groups)
  cripple_rubygems(specs)
  # Activate the specs
  specs.each do |spec|
    Gem.loaded_specs[spec.name] = spec
    $LOAD_PATH.unshift(*spec.load_paths)
  end
  self
end

def sources
  @definition.sources
end

def specs
  @specs ||= begin
    source_requirements = {}
    actual_dependencies.each do |dep|
      next unless dep.source && dep.source.respond_to?(:local_specs)
      source_requirements[dep.name] = dep.source.local_specs
    end
    group_specs(Resolver.resolve(@definition.actual_dependencies, index, source_requirements))
  end
end

def specs_for(*groups)
  groups = @definition.groups if groups.empty?
  groups -= Bundler.settings.without
  groups.map! { |g| g.to_sym }
  specs.select { |s| (s.groups & groups).any? }
end

def specs_for_lock_file
  specs_for.map do |s|
    hash = {}
    hash[:loaded_from] = s.loaded_from.to_s
    hash[:load_paths]  = s.load_paths
    hash
  end
end

def write_rb_lock
  shared_helpers = File.read(File.expand_path("../shared_helpers.rb", __FILE__))
  template = File.read(File.expand_path("../templates/environment.erb", __FILE__))
  erb = ERB.new(template, nil, '-')
  FileUtils.mkdir_p(rb_lock_file.dirname)
  File.open(rb_lock_file, 'w') do |f|
    f.puts erb.result(binding)
  end
end

def write_yml_lock
  yml = details.to_yaml
  File.open("#{root}/Gemfile.lock", 'w') do |f|
    f.puts yml
  end
end