class Bundler::Definition

def self.build(gemfile, lockfile, unlock)
  unlock ||= {}
  gemfile = Pathname.new(gemfile).expand_path
  raise GemfileNotFound, "#{gemfile} not found" unless gemfile.file?
  Dsl.evaluate(gemfile, lockfile, unlock)
end

def add_current_platform
  add_platform(local_platform)
end

def add_platform(platform)
  @new_platform ||= !@platforms.include?(platform)
  @platforms |= [platform]
end

def additional_base_requirements_for_resolve
  return [] unless @locked_gems && unlocking? && !sources.expired_sources?(@locked_gems.sources)
  converge_specs(@originally_locked_specs).map do |locked_spec|
    name = locked_spec.name
    dep = Gem::Dependency.new(name, ">= #{locked_spec.version}")
    DepProxy.get_proxy(dep, locked_spec.platform)
  end
end

def change_reason
  if unlocking?
    unlock_reason = @unlock.reject {|_k, v| Array(v).empty? }.map do |k, v|
      if v == true
        k.to_s
      else
        v = Array(v)
        "#{k}: (#{v.join(", ")})"
      end
    end.join(", ")
    return "bundler is unlocking #{unlock_reason}"
  end
  [
    [@source_changes, "the list of sources changed"],
    [@dependency_changes, "the dependencies in your gemfile changed"],
    [@new_platform, "you added a new platform to your gemfile"],
    [@path_changes, "the gemspecs for path gems changed"],
    [@local_changes, "the gemspecs for git local gems changed"],
    [@locked_specs_incomplete_for_platform, "the lockfile does not have all gems needed for the current platform"],
  ].select(&:first).map(&:last).join(", ")
end

def compute_requires
  dependencies.reduce({}) do |requires, dep|
    next requires unless dep.should_include?
    requires[dep.name] = Array(dep.autorequire || dep.name).map do |file|
      # Allow `require: true` as an alias for `require: <name>`
      file == true ? dep.name : file
    end
    requires
  end
end

def converge_dependencies
  changes = false
  @dependencies.each do |dep|
    if dep.source
      dep.source = sources.get(dep.source)
    end
    unless locked_dep = @locked_deps[dep.name]
      changes = true
      next
    end
    # Gem::Dependency#== matches Gem::Dependency#type. As the lockfile
    # doesn't carry a notion of the dependency type, if you use
    # add_development_dependency in a gemspec that's loaded with the gemspec
    # directive, the lockfile dependencies and resolved dependencies end up
    # with a mismatch on #type. Work around that by setting the type on the
    # dep from the lockfile.
    locked_dep.instance_variable_set(:@type, dep.type)
    # We already know the name matches from the hash lookup
    # so we only need to check the requirement now
    changes ||= dep.requirement != locked_dep.requirement
  end
  changes
end

def converge_locals
  locals = []
  Bundler.settings.local_overrides.map do |k, v|
    spec   = @dependencies.find {|s| s.name == k }
    source = spec && spec.source
    if source && source.respond_to?(:local_override!)
      source.unlock! if @unlock[:gems].include?(spec.name)
      locals << [source, source.local_override!(v)]
    end
  end
  sources_with_changes = locals.select do |source, changed|
    changed || specs_changed?(source)
  end.map(&:first)
  !sources_with_changes.each {|source| @unlock[:sources] << source.name }.empty?
end

def converge_locked_specs
  resolve = converge_specs(@locked_specs)
  diff = nil
  # Now, we unlock any sources that do not have anymore gems pinned to it
  sources.all_sources.each do |source|
    next unless source.respond_to?(:unlock!)
    unless resolve.any? {|s| s.source == source }
      diff ||= @locked_specs.to_a - resolve.to_a
      source.unlock! if diff.any? {|s| s.source == source }
    end
  end
  resolve
end

def converge_path_source_to_gemspec_source(source)
  return source unless source.instance_of?(Source::Path)
  gemspec_source = sources.path_sources.find {|s| s.is_a?(Source::Gemspec) && s.as_path_source == source }
  gemspec_source || source
end

def converge_path_sources_to_gemspec_sources
  @locked_sources.map! do |source|
    converge_path_source_to_gemspec_source(source)
  end
  @locked_specs.each do |spec|
    spec.source &&= converge_path_source_to_gemspec_source(spec.source)
  end
  @locked_deps.each do |_, dep|
    dep.source &&= converge_path_source_to_gemspec_source(dep.source)
  end
end

def converge_paths
  sources.path_sources.any? do |source|
    specs_changed?(source)
  end
end

def converge_sources
  # Replace the sources from the Gemfile with the sources from the Gemfile.lock,
  # if they exist in the Gemfile.lock and are `==`. If you can't find an equivalent
  # source in the Gemfile.lock, use the one from the Gemfile.
  changes = sources.replace_sources!(@locked_sources)
  sources.all_sources.each do |source|
    # If the source is unlockable and the current command allows an unlock of
    # the source (for example, you are doing a `bundle update <foo>` of a git-pinned
    # gem), unlock it. For git sources, this means to unlock the revision, which
    # will cause the `ref` used to be the most recent for the branch (or master) if
    # an explicit `ref` is not used.
    if source.respond_to?(:unlock!) && @unlock[:sources].include?(source.name)
      source.unlock!
      changes = true
    end
  end
  changes
end

def converge_specs(specs)
  converged = []
  deps = @dependencies.select do |dep|
    specs[dep].any? {|s| s.satisfies?(dep) && (!dep.source || s.source.include?(dep.source)) }
  end
  specs.each do |s|
    # Replace the locked dependency's source with the equivalent source from the Gemfile
    dep = @dependencies.find {|d| s.satisfies?(d) }
    s.source = (dep && dep.source) || sources.get(s.source) || sources.default_source
    next if @unlock[:sources].include?(s.source.name)
    # If the spec is from a path source and it doesn't exist anymore
    # then we unlock it.
    # Path sources have special logic
    if s.source.instance_of?(Source::Path) || s.source.instance_of?(Source::Gemspec)
      new_specs = begin
        s.source.specs
      rescue PathError, GitError
        # if we won't need the source (according to the lockfile),
        # don't error if the path/git source isn't available
        next if specs.
                for(requested_dependencies, false, true).
                none? {|locked_spec| locked_spec.source == s.source }
        raise
      end
      new_spec = new_specs[s].first
      # If the spec is no longer in the path source, unlock it. This
      # commonly happens if the version changed in the gemspec
      next unless new_spec
      s.dependencies.replace(new_spec.dependencies)
    end
    if dep.nil? && requested_dependencies.find {|d| s.name == d.name }
      @unlock[:gems] << s.name
    else
      converged << s
    end
  end
  SpecSet.new(filter_specs(converged, deps).reject {|s| @unlock[:gems].include?(s.name) })
end

def current_dependencies
  dependencies.select do |d|
    d.should_include? && !d.gem_platforms(@platforms).empty?
  end
end

def current_platform_locked?
  @platforms.any? do |bundle_platform|
    MatchPlatform.platforms_match?(bundle_platform, Bundler.local_platform)
  end
end

def current_ruby_platform_locked?
  return false unless generic_local_platform == Gem::Platform::RUBY
  return false if Bundler.settings[:force_ruby_platform] && !@platforms.include?(Gem::Platform::RUBY)
  current_platform_locked?
end

def dependencies_for(groups)
  groups.map!(&:to_sym)
  deps = current_dependencies.reject do |d|
    (d.groups & groups).empty?
  end
  expand_dependencies(deps)
end

def dependencies_for_source_changed?(source, locked_source = source)
  deps_for_source = @dependencies.select {|s| s.source == source }
  locked_deps_for_source = locked_dependencies.select {|dep| dep.source == locked_source }
  deps_for_source.uniq.sort != locked_deps_for_source.sort
end

def ensure_equivalent_gemfile_and_lockfile(explicit_flag = false)
  msg = String.new
  msg << "You are trying to install in deployment mode after changing\n" \
         "your Gemfile. Run `bundle install` elsewhere and add the\n" \
         "updated #{Bundler.default_lockfile.relative_path_from(SharedHelpers.pwd)} to version control."
  unless explicit_flag
    suggested_command = if Bundler.settings.locations("frozen").keys.&([:global, :local]).any?
      "bundle config unset frozen"
    elsif Bundler.settings.locations("deployment").keys.&([:global, :local]).any?
      "bundle config unset deployment"
    end
    msg << "\n\nIf this is a development machine, remove the #{Bundler.default_gemfile} " \
           "freeze \nby running `#{suggested_command}`."
  end
  added =   []
  deleted = []
  changed = []
  new_platforms = @platforms - @locked_platforms
  deleted_platforms = @locked_platforms - @platforms
  added.concat new_platforms.map {|p| "* platform: #{p}" }
  deleted.concat deleted_platforms.map {|p| "* platform: #{p}" }
  new_deps = @dependencies - locked_dependencies
  deleted_deps = locked_dependencies - @dependencies
  added.concat new_deps.map {|d| "* #{pretty_dep(d)}" } if new_deps.any?
  deleted.concat deleted_deps.map {|d| "* #{pretty_dep(d)}" } if deleted_deps.any?
  both_sources = Hash.new {|h, k| h[k] = [] }
  @dependencies.each {|d| both_sources[d.name][0] = d }
  locked_dependencies.each do |d|
    next if !Bundler.feature_flag.bundler_3_mode? && @locked_specs[d.name].empty?
    both_sources[d.name][1] = d
  end
  both_sources.each do |name, (dep, lock_dep)|
    next if dep.nil? || lock_dep.nil?
    gemfile_source = dep.source || sources.default_source
    lock_source = lock_dep.source || sources.default_source
    next if lock_source.include?(gemfile_source)
    gemfile_source_name = dep.source ? gemfile_source.identifier : "no specified source"
    lockfile_source_name = lock_dep.source ? lock_source.identifier : "no specified source"
    changed << "* #{name} from `#{lockfile_source_name}` to `#{gemfile_source_name}`"
  end
  reason = change_reason
  msg << "\n\n#{reason.split(", ").map(&:capitalize).join("\n")}" unless reason.strip.empty?
  msg << "\n\nYou have added to the Gemfile:\n" << added.join("\n") if added.any?
  msg << "\n\nYou have deleted from the Gemfile:\n" << deleted.join("\n") if deleted.any?
  msg << "\n\nYou have changed in the Gemfile:\n" << changed.join("\n") if changed.any?
  msg << "\n"
  raise ProductionError, msg if added.any? || deleted.any? || changed.any? || !nothing_changed?
end

def expand_dependencies(dependencies, remote = false)
  deps = []
  dependencies.each do |dep|
    dep = Dependency.new(dep, ">= 0") unless dep.respond_to?(:name)
    next unless remote || dep.current_platform?
    target_platforms = dep.gem_platforms(remote ? @platforms : [generic_local_platform])
    deps += expand_dependency_with_platforms(dep, target_platforms)
  end
  deps
end

def expand_dependency_with_platforms(dep, platforms)
  platforms.map do |p|
    DepProxy.get_proxy(dep, p)
  end
end

def filter_specs(specs, deps)
  SpecSet.new(specs).for(expand_dependencies(deps, true), false, false)
end

def gem_version_promoter
  @gem_version_promoter ||= begin
    locked_specs =
      if unlocking? && @locked_specs.empty? && !@lockfile_contents.empty?
        # Definition uses an empty set of locked_specs to indicate all gems
        # are unlocked, but GemVersionPromoter needs the locked_specs
        # for conservative comparison.
        Bundler::SpecSet.new(@locked_gems.specs)
      else
        @locked_specs
      end
    GemVersionPromoter.new(locked_specs, @unlock[:gems])
  end
end

def groups
  dependencies.map(&:groups).flatten.uniq
end

def initialize(lockfile, dependencies, sources, unlock, ruby_version = nil, optional_groups = [], gemfiles = [])
  if [true, false].include?(unlock)
    @unlocking_bundler = false
    @unlocking = unlock
  else
    @unlocking_bundler = unlock.delete(:bundler)
    @unlocking = unlock.any? {|_k, v| !Array(v).empty? }
  end
  @dependencies    = dependencies
  @sources         = sources
  @unlock          = unlock
  @optional_groups = optional_groups
  @remote          = false
  @specs           = nil
  @ruby_version    = ruby_version
  @gemfiles        = gemfiles
  @lockfile               = lockfile
  @lockfile_contents      = String.new
  @locked_bundler_version = nil
  @locked_ruby_version    = nil
  @new_platform = nil
  if lockfile && File.exist?(lockfile)
    @lockfile_contents = Bundler.read_file(lockfile)
    @locked_gems = LockfileParser.new(@lockfile_contents)
    @locked_platforms = @locked_gems.platforms
    @platforms = @locked_platforms.dup
    @locked_bundler_version = @locked_gems.bundler_version
    @locked_ruby_version = @locked_gems.ruby_version
    @originally_locked_specs = SpecSet.new(@locked_gems.specs)
    if unlock != true
      @locked_deps    = @locked_gems.dependencies
      @locked_specs   = @originally_locked_specs
      @locked_sources = @locked_gems.sources
    else
      @unlock         = {}
      @locked_deps    = {}
      @locked_specs   = SpecSet.new([])
      @locked_sources = []
    end
  else
    @unlock         = {}
    @platforms      = []
    @locked_gems    = nil
    @locked_deps    = {}
    @locked_specs   = SpecSet.new([])
    @locked_sources = []
    @locked_platforms = []
  end
  locked_gem_sources = @locked_sources.select {|s| s.is_a?(Source::Rubygems) }
  @multisource_allowed = locked_gem_sources.size == 1 && locked_gem_sources.first.multiple_remotes? && Bundler.frozen_bundle?
  if @multisource_allowed
    unless sources.aggregate_global_source?
      msg = "Your lockfile contains a single rubygems source section with multiple remotes, which is insecure. Make sure you run `bundle install` in non frozen mode and commit the result to make your lockfile secure."
      Bundler::SharedHelpers.major_deprecation 2, msg
    end
    @sources.merged_gem_lockfile_sections!(locked_gem_sources.first)
  end
  @unlock[:sources] ||= []
  @unlock[:ruby] ||= if @ruby_version && locked_ruby_version_object
    @ruby_version.diff(locked_ruby_version_object)
  end
  @unlocking ||= @unlock[:ruby] ||= (!@locked_ruby_version ^ !@ruby_version)
  add_current_platform unless current_ruby_platform_locked? || Bundler.frozen_bundle?
  converge_path_sources_to_gemspec_sources
  @path_changes = converge_paths
  @source_changes = converge_sources
  if @unlock[:conservative]
    @unlock[:gems] ||= @dependencies.map(&:name)
  else
    eager_unlock = expand_dependencies(@unlock[:gems] || [], true)
    @unlock[:gems] = @locked_specs.for(eager_unlock, false, false).map(&:name)
  end
  @dependency_changes = converge_dependencies
  @local_changes = converge_locals
  @locked_specs_incomplete_for_platform = !@locked_specs.for(requested_dependencies & expand_dependencies(locked_dependencies), true, true)
  @requires = compute_requires
end

def lock(file, preserve_unknown_sections = false)
  return if Definition.no_lock
  contents = to_lock
  # Convert to \r\n if the existing lock has them
  # i.e., Windows with `git config core.autocrlf=true`
  contents.gsub!(/\n/, "\r\n") if @lockfile_contents.match("\r\n")
  if @locked_bundler_version
    locked_major = @locked_bundler_version.segments.first
    current_major = Gem::Version.create(Bundler::VERSION).segments.first
    updating_major = locked_major < current_major
  end
  preserve_unknown_sections ||= !updating_major && (Bundler.frozen_bundle? || !(unlocking? || @unlocking_bundler))
  return if file && File.exist?(file) && lockfiles_equal?(@lockfile_contents, contents, preserve_unknown_sections)
  if Bundler.frozen_bundle?
    Bundler.ui.error "Cannot write a changed lockfile while frozen."
    return
  end
  SharedHelpers.filesystem_access(file) do |p|
    File.open(p, "wb") {|f| f.puts(contents) }
  end
end

def locked_dependencies
  @locked_deps.values
end

def locked_ruby_version
  return unless ruby_version
  if @unlock[:ruby] || !@locked_ruby_version
    Bundler::RubyVersion.system
  else
    @locked_ruby_version
  end
end

def locked_ruby_version_object
  return unless @locked_ruby_version
  @locked_ruby_version_object ||= begin
    unless version = RubyVersion.from_string(@locked_ruby_version)
      raise LockfileError, "The Ruby version #{@locked_ruby_version} from " \
        "#{@lockfile} could not be parsed. " \
        "Try running bundle update --ruby to resolve this."
    end
    version
  end
end

def lockfiles_equal?(current, proposed, preserve_unknown_sections)
  if preserve_unknown_sections
    sections_to_ignore = LockfileParser.sections_to_ignore(@locked_bundler_version)
    sections_to_ignore += LockfileParser.unknown_sections_in_lockfile(current)
    sections_to_ignore += LockfileParser::ENVIRONMENT_VERSION_SECTIONS
    pattern = /#{Regexp.union(sections_to_ignore)}\n(\s{2,}.*\n)+/
    whitespace_cleanup = /\n{2,}/
    current = current.gsub(pattern, "\n").gsub(whitespace_cleanup, "\n\n").strip
    proposed = proposed.gsub(pattern, "\n").gsub(whitespace_cleanup, "\n\n").strip
  end
  current == proposed
end

def materialize(dependencies)
  specs = resolve.materialize(dependencies)
  missing_specs = specs.missing_specs
  if missing_specs.any?
    missing_specs.each do |s|
      locked_gem = @locked_specs[s.name].last
      next if locked_gem.nil? || locked_gem.version != s.version || !@remote
      raise GemNotFound, "Your bundle is locked to #{locked_gem} from #{locked_gem.source}, but that version can " \
                         "no longer be found in that source. That means the author of #{locked_gem} has removed it. " \
                         "You'll need to update your bundle to a version other than #{locked_gem} that hasn't been " \
                         "removed in order to install."
    end
    raise GemNotFound, "Could not find #{missing_specs.map(&:full_name).join(", ")} in any of the sources"
  end
  unless specs["bundler"].any?
    bundler = sources.metadata_source.specs.search(Gem::Dependency.new("bundler", VERSION)).last
    specs["bundler"] = bundler
  end
  specs
end

def metadata_dependencies
  @metadata_dependencies ||= begin
    [
      Dependency.new("Ruby\0", RubyVersion.system.gem_version),
      Dependency.new("RubyGems\0", Gem::VERSION),
    ]
  end
end

def missing_specs
  resolve.materialize(requested_dependencies).missing_specs
end

def missing_specs?
  missing = missing_specs
  return false if missing.empty?
  Bundler.ui.debug "The definition is missing #{missing.map(&:full_name)}"
  true
rescue BundlerError => e
  @resolve = nil
  @specs = nil
  @gem_version_promoter = nil
  Bundler.ui.debug "The definition is missing dependencies, failed to resolve & materialize locally (#{e})"
  true
end

def most_specific_locked_platform
  @platforms.min_by do |bundle_platform|
    platform_specificity_match(bundle_platform, local_platform)
  end
end

def new_specs
  specs - @locked_specs
end

def nothing_changed?
  !@source_changes && !@dependency_changes && !@new_platform && !@path_changes && !@local_changes && !@locked_specs_incomplete_for_platform
end

def precompute_source_requirements_for_indirect_dependencies?
  @remote && sources.non_global_rubygems_sources.all?(&:dependency_api_available?) && !sources.aggregate_global_source?
end

def pretty_dep(dep, source = false)
  SharedHelpers.pretty_dependency(dep, source)
end

def remove_platform(platform)
  return if @platforms.delete(Gem::Platform.new(platform))
  raise InvalidOption, "Unable to remove the platform `#{platform}` since the only platforms are #{@platforms.join ", "}"
end

def removed_specs
  @locked_specs - specs
end

def requested_dependencies
  dependencies_for(requested_groups)
end

def requested_groups
  groups - Bundler.settings[:without] - @optional_groups + Bundler.settings[:with]
end

def requested_specs
  specs_for(requested_groups)
end

def resolve
  @resolve ||= begin
    if Bundler.frozen_bundle?
      Bundler.ui.debug "Frozen, using resolution from the lockfile"
      @locked_specs
    elsif !unlocking? && nothing_changed?
      Bundler.ui.debug("Found no changes, using resolution from the lockfile")
      SpecSet.new(filter_specs(@locked_specs, @dependencies.select {|dep| @locked_specs[dep].any? }))
    else
      last_resolve = converge_locked_specs
      # Run a resolve against the locally available gems
      Bundler.ui.debug("Found changes from the lockfile, re-resolving dependencies because #{change_reason}")
      expanded_dependencies = expand_dependencies(dependencies + metadata_dependencies, true)
      Resolver.resolve(expanded_dependencies, source_requirements, last_resolve, gem_version_promoter, additional_base_requirements_for_resolve, platforms)
    end
  end
end

def resolve_only_locally!
  @remote = false
  sources.local_only!
  resolve
end

def resolve_remotely!
  @remote = true
  sources.remote!
  resolve
end

def resolve_with_cache!
  sources.cached!
  resolve
end

def source_map
  @source_map ||= SourceMap.new(sources, dependencies, @locked_specs)
end

def source_requirements
  # Record the specs available in each gem's source, so that those
  # specs will be available later when the resolver knows where to
  # look for that gemspec (or its dependencies)
  source_requirements = if precompute_source_requirements_for_indirect_dependencies?
    { :default => sources.default_source }.merge(source_map.all_requirements)
  else
    { :default => Source::RubygemsAggregate.new(sources, source_map) }.merge(source_map.direct_requirements)
  end
  source_requirements.merge!(source_map.locked_requirements) unless @remote
  metadata_dependencies.each do |dep|
    source_requirements[dep.name] = sources.metadata_source
  end
  source_requirements[:default_bundler] = source_requirements["bundler"] || sources.default_source
  source_requirements["bundler"] = sources.metadata_source # needs to come last to override
  source_requirements
end

def spec_git_paths
  sources.git_sources.map {|s| File.realpath(s.path) if File.exist?(s.path) }.compact
end

def specs
  @specs ||= materialize(requested_dependencies)
end

def specs_changed?(source)
  locked = @locked_sources.find {|s| s == source }
  !locked || dependencies_for_source_changed?(source, locked) || specs_for_source_changed?(source)
end

def specs_for(groups)
  return specs if groups.empty?
  deps = dependencies_for(groups)
  materialize(deps)
end

def specs_for_source_changed?(source)
  locked_index = Index.new
  locked_index.use(@locked_specs.select {|s| source.can_lock?(s) })
  # order here matters, since Index#== is checking source.specs.include?(locked_index)
  locked_index != source.specs
rescue PathError, GitError => e
  Bundler.ui.debug "Assuming that #{source} has not changed since fetching its specs errored (#{e})"
  false
end

def to_lock
  require_relative "lockfile_generator"
  LockfileGenerator.generate(self)
end

def unlocking?
  @unlocking
end

def validate_platforms!
  return if current_platform_locked?
  raise ProductionError, "Your bundle only supports platforms #{@platforms.map(&:to_s)} " \
    "but your local platform is #{Bundler.local_platform}. " \
    "Add the current platform to the lockfile with\n`bundle lock --add-platform #{Bundler.local_platform}` and try again."
end

def validate_ruby!
  return unless ruby_version
  if diff = ruby_version.diff(Bundler::RubyVersion.system)
    problem, expected, actual = diff
    msg = case problem
          when :engine
            "Your Ruby engine is #{actual}, but your Gemfile specified #{expected}"
          when :version
            "Your Ruby version is #{actual}, but your Gemfile specified #{expected}"
          when :engine_version
            "Your #{Bundler::RubyVersion.system.engine} version is #{actual}, but your Gemfile specified #{ruby_version.engine} #{expected}"
          when :patchlevel
            if !expected.is_a?(String)
              "The Ruby patchlevel in your Gemfile must be a string"
            else
              "Your Ruby patchlevel is #{actual}, but your Gemfile specified #{expected}"
            end
    end
    raise RubyVersionMismatch, msg
  end
end

def validate_runtime!
  validate_ruby!
  validate_platforms!
end