class Bundler::LockfileParser

def self.sections_in_lockfile(lockfile_contents)
  lockfile_contents.scan(/^\w[\w ]*$/).uniq
end

def self.sections_to_ignore(base_version = nil)
  base_version &&= base_version.release
  base_version ||= Gem::Version.create("1.0".dup)
  attributes = []
  SECTIONS_BY_VERSION_INTRODUCED.each do |version, introduced|
    next if version <= base_version
    attributes += introduced
  end
  attributes
end

def self.unknown_sections_in_lockfile(lockfile_contents)
  sections_in_lockfile(lockfile_contents) - KNOWN_SECTIONS
end

def initialize(lockfile)
  @platforms    = []
  @sources      = []
  @dependencies = {}
  @state        = nil
  @specs        = {}
  if lockfile.match(/<<<<<<<|=======|>>>>>>>|\|\|\|\|\|\|\|/)
    raise LockfileError, "Your #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)} contains merge conflicts.\n" \
      "Run `git checkout HEAD -- #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}` first to get a clean lock."
  end
  lockfile.split(/(?:\r?\n)+/).each do |line|
    if SOURCE.include?(line)
      @state = :source
      parse_source(line)
    elsif line == DEPENDENCIES
      @state = :dependency
    elsif line == PLATFORMS
      @state = :platform
    elsif line == RUBY
      @state = :ruby
    elsif line == BUNDLED
      @state = :bundled_with
    elsif line =~ /^[^\s]/
      @state = nil
    elsif @state
      send("parse_#{@state}", line)
    end
  end
  @specs = @specs.values.sort_by(&:identifier)
  warn_for_outdated_bundler_version
rescue ArgumentError => e
  Bundler.ui.debug(e)
  raise LockfileError, "Your lockfile is unreadable. Run `rm #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)}` " \
    "and then `bundle install` to generate a new lockfile."
end

def parse_bundled_with(line)
  line = line.strip
  return unless Gem::Version.correct?(line)
  @bundler_version = Gem::Version.create(line)
end

def parse_dependency(line)
  return unless line =~ NAME_VERSION
  spaces = $1
  return unless spaces.size == 2
  name = $2
  version = $3
  pinned = $5
  version = version.split(",").map(&:strip) if version
  dep = Bundler::Dependency.new(name, version)
  if pinned && dep.name != "bundler"
    spec = @specs.find {|_, v| v.name == dep.name }
    dep.source = spec.last.source if spec
    # Path sources need to know what the default name / version
    # to use in the case that there are no gemspecs present. A fake
    # gemspec is created based on the version set on the dependency
    # TODO: Use the version from the spec instead of from the dependency
    if version && version.size == 1 && version.first =~ /^\s*= (.+)\s*$/ && dep.source.is_a?(Bundler::Source::Path)
      dep.source.name    = name
      dep.source.version = $1
    end
  end
  @dependencies[dep.name] = dep
end

def parse_platform(line)
  @platforms << Gem::Platform.new($1) if line =~ /^  (.*)$/
end

def parse_ruby(line)
  @ruby_version = line.strip
end

def parse_source(line)
  case line
  when SPECS
    case @type
    when PATH
      @current_source = TYPES[@type].from_lock(@opts)
      @sources << @current_source
    when GIT
      @current_source = TYPES[@type].from_lock(@opts)
      @sources << @current_source
    when GEM
      @opts["remotes"] = Array(@opts.delete("remote")).reverse
      @current_source = TYPES[@type].from_lock(@opts)
      @sources << @current_source
    when PLUGIN
      @current_source = Plugin.source_from_lock(@opts)
      @sources << @current_source
    end
  when OPTIONS
    value = $2
    value = true if value == "true"
    value = false if value == "false"
    key = $1
    if @opts[key]
      @opts[key] = Array(@opts[key])
      @opts[key] << value
    else
      @opts[key] = value
    end
  when *SOURCE
    @current_source = nil
    @opts = {}
    @type = line
  else
    parse_spec(line)
  end
end

def parse_spec(line)
  return unless line =~ NAME_VERSION
  spaces = $1
  name = $2
  version = $3
  platform = $4
  if spaces.size == 4
    version = Gem::Version.new(version)
    platform = platform ? Gem::Platform.new(platform) : Gem::Platform::RUBY
    @current_spec = LazySpecification.new(name, version, platform)
    @current_spec.source = @current_source
    @current_source.add_dependency_names(name)
    @specs[@current_spec.identifier] = @current_spec
  elsif spaces.size == 6
    version = version.split(",").map(&:strip) if version
    dep = Gem::Dependency.new(name, version)
    @current_spec.dependencies << dep
  end
end

def warn_for_outdated_bundler_version
  return unless bundler_version
  prerelease_text = bundler_version.prerelease? ? " --pre" : ""
  current_version = Gem::Version.create(Bundler::VERSION)
  return unless current_version < bundler_version
  Bundler.ui.warn "Warning: the running version of Bundler (#{current_version}) is older " \
       "than the version that created the lockfile (#{bundler_version}). We suggest you to " \
       "upgrade to the version that created the lockfile by running `gem install " \
       "bundler:#{bundler_version}#{prerelease_text}`.\n"
end