class Inspec::Requirement

def self.from_lock_entry(entry, config, opts = {})
  req = new(entry[:name],
            entry[:version_constraints],
            config,
            entry[:resolved_source].merge(backend: config[:backend]).merge(opts))
  locked_deps = []
  Array(entry[:dependencies]).each do |dep_entry|
    dep_config = config.dup
    dep_config[:parent_profile] = entry[:name]
    locked_deps << Inspec::Requirement.from_lock_entry(dep_entry, dep_config, opts)
  end
  req.lock_deps(locked_deps)
  req
end

def self.from_metadata(dep, cache, opts)
  raise 'Cannot load empty dependency.' if dep.nil? || dep.empty?
  req_path = opts[:cwd]
  if dep[:path]
    req_path = File.expand_path(dep[:path], req_path)
  end
  config = {
    cache: cache,
    cwd: req_path,
  }
  new(dep[:name],
      dep[:version],
      config,
      opts.merge(dep))
end

def dependencies
  @dependencies ||= profile.metadata.dependencies.map do |r|
    Inspec::Requirement.from_metadata(r, @cache, cwd: @cwd, backend: @backend)
  end
end

def fetcher
  @fetcher ||= Inspec::CachedFetcher.new(opts, @cache)
end

def initialize(name, version_constraints, config, opts)
  @name = name
  @version_constraints = Array(version_constraints)
  @cache = config[:cache]
  @backend = opts[:backend]
  @opts = opts
  @cwd = config[:cwd]
  @parent_profile = config[:parent_profile]
end

def lock_deps(dep_array)
  @dependencies = dep_array
end

def name
  @name || profile.name
end

def profile
  return @profile unless @profile.nil?
  opts = @opts.dup
  opts[:backend] = @backend
  if !@dependencies.nil? && !@dependencies.empty?
    opts[:dependencies] = Inspec::DependencySet.from_array(@dependencies, @cwd, @cache, @backend)
  end
  @profile = Inspec::Profile.for_fetcher(fetcher, opts)
  @profile.parent_profile = @parent_profile
  @profile
end

def resolved_source
  @resolved_source ||= fetcher.resolved_source
end

def source_satisfies_spec?
  return true if version_constraints.empty?
  # Semverse::Constraint.satisfy_all returns a list of versions that match all of the
  # supplied constraints. Since we're only matching against a single version, the return
  # of satisfy_all will be non-empty if the profile version we have satisfies the constraints.
  constraints = @version_constraints.map { |x| Semverse::Constraint.new(x) }
  !Semverse::Constraint.satisfy_all(constraints, Semverse::Version.new(profile.version)).empty?
end

def source_version
  profile.version
end

def to_hash
  h = {
    'name' => name,
    'resolved_source' => resolved_source,
    'version_constraints' => version_constraints,
  }
  if !dependencies.empty?
    h['dependencies'] = dependencies.map(&:to_hash)
  end
  h
end

def to_s
  name
end