class HTMLPipeline

# File lib/html_pipeline.rb, line 86
def define_dependency_loaded_method(name, value)
  self.class.define_method(:"#{name}_loaded?", -> { value })
end

# File lib/html_pipeline.rb, line 114
def initialize(text_filters: [], convert_filter: nil, sanitization_config: SanitizationFilter::DEFAULT_CONFIG, node_filters: [], default_context: {}, result_class: Hash)
  raise ArgumentError, "default_context cannot be nil" if default_context.nil?

  @text_filters = text_filters.flatten.freeze || []
  validate_filters(@text_filters, HTMLPipeline::TextFilter)

  @node_filters = node_filters.flatten.freeze || []
  validate_filters(@node_filters, HTMLPipeline::NodeFilter)

  @convert_filter = convert_filter

  if @convert_filter.nil? && (!@text_filters.empty? && !@node_filters.empty?)
    raise InvalidFilterError, "Must provide `convert_filter` if `text_filters` and `node_filters` are also provided"
  elsif !@convert_filter.nil?
    validate_filter(@convert_filter, HTMLPipeline::ConvertFilter)
  end

  @sanitization_config = sanitization_config.nil? ? nil : Selma::Sanitizer.new(sanitization_config)

  @default_context = default_context.freeze
  @instrumentation_service = self.class.default_instrumentation_service
end

# File lib/html_pipeline.rb, line 45
def optional_dependency(name, requirer)
  require name
rescue LoadError # rubocop:disable Lint/SuppressedException:
end

# File lib/html_pipeline.rb, line 57
def require_dependencies(names, requirer)
  dependency_list = names.dup
  loaded = false

  while !loaded && names.length > 1
    name = names.shift

    begin
      require_dependency(name, requirer)
      loaded = true # we got a dependency
      define_dependency_loaded_method(name, true)
    # try the next dependency
    rescue MissingDependencyError
      define_dependency_loaded_method(name, false)
    end
  end

  return if loaded

  begin
    name = names.shift
    require name
    define_dependency_loaded_method(name, true)
  rescue LoadError => e
    raise MissingDependencyError,
      "Missing all dependencies '#{dependency_list.join(", ")}' for #{requirer}. See README.md for details.\n#{e.class.name}: #{e}"
  end
end

# File lib/html_pipeline.rb, line 50
def require_dependency(name, requirer)
  require name
rescue LoadError => e
  raise MissingDependencyError,
    "Missing dependency '#{name}' for #{requirer}. See README.md for details.\n#{e.class.name}: #{e}"
end

# File lib/html_pipeline.rb, line 149
def call(text, context: {}, result: {})
  context = @default_context.merge(context)
  context = context.freeze
  result ||= {}

  if @text_filters.any?
    payload = default_payload({
      text_filters: @text_filters.map { |f| f.class.name },
      context: context,
      result: result,
    })
    instrument("call_text_filters.html_pipeline", payload) do
      result[:output] =
        @text_filters.inject(text) do |doc, filter|
          perform_filter(filter, doc, context: (filter.context || {}).merge(context), result: result)
        end
    end
  end

  text = result[:output] || text

  html = if @convert_filter.nil?
    text
  else
    instrument("call_convert_filter.html_pipeline", payload) do
      html = @convert_filter.call(text, context: (@convert_filter.context || {}).merge(context))
    end
  end

  rewriter_options = {
    memory: {
      max_allowed_memory_usage: 5242880, # arbitrary limit of 5MB
    },
  }

  if @node_filters.empty?
    instrument("sanitization.html_pipeline", payload) do
      result[:output] = Selma::Rewriter.new(sanitizer: @sanitization_config, handlers: @node_filters, options: rewriter_options).rewrite(html)
    end unless @convert_filter.nil? # no html, so no sanitization
  else
    instrument("call_node_filters.html_pipeline", payload) do
      @node_filters.each { |filter| filter.context = (filter.context || {}).merge(context) }
      result[:output] = Selma::Rewriter.new(sanitizer: @sanitization_config, handlers: @node_filters, options: rewriter_options).rewrite(html)
      payload = default_payload({
        node_filters: @node_filters.map { |f| f.class.name },
        context: context,
        result: result,
      })
    end
  end

  result = result.merge(@node_filters.collect(&:result).reduce({}, :merge))
  @node_filters.each(&:reset!)

  result
end

# File lib/html_pipeline.rb, line 259
def default_payload(payload = {})
  { pipeline: instrumentation_name }.merge(payload)
end

# File lib/html_pipeline.rb, line 247
def instrument(event, payload = {}, &block)
  payload ||= default_payload
  return yield(payload) unless instrumentation_service

  instrumentation_service.instrument(event, payload, &block)
end

# File lib/html_pipeline.rb, line 103
def instrumentation_name
  return @instrumentation_name if defined?(@instrumentation_name)

  @instrumentation_name = self.class.name
end

# File lib/html_pipeline.rb, line 211
def perform_filter(filter, doc, context: {}, result: {})
  payload = default_payload({
    filter: filter.class.name,
    context: context,
    result: result,
  })

  instrument("call_filter.html_pipeline", payload) do
    filter.call(doc, context: context, result: result)
  end
end

# File lib/html_pipeline.rb, line 237
def setup_instrumentation(name, service: nil)
  self.instrumentation_name = name
  self.instrumentation_service =
    service || self.class.default_instrumentation_service
end

# File lib/html_pipeline.rb, line 224
def to_html(input, context: {}, result: {})
  result = call(input, context: context, result: result)
  output = result[:output]
  if output.respond_to?(:to_html)
    output.to_html
  else
    output.to_s
  end
end

# File lib/html_pipeline.rb, line 280
        def correctly_ancestored?(filter, klass)
  if filter.respond_to?(:ancestors)
    filter.ancestors.include?(klass)
  else
    filter.class.ancestors.include?(klass)
  end
end

# File lib/html_pipeline.rb, line 263
        def validate_filter(filter, klass)
  unless correctly_ancestored?(filter, klass)
    raise InvalidFilterError, "Filter must inherit from `#{klass}`; #{filter} does not"
  end
end

# File lib/html_pipeline.rb, line 269
        def validate_filters(filters, klass)
  return if filters.nil? || filters.empty?

  invalid_filters = filters.reject { |f| correctly_ancestored?(f, klass) }

  unless invalid_filters.empty?
    verb = invalid_filters.count == 1 ? "does" : "do"
    raise InvalidFilterError, "All filters must inherit from `#{klass}`; #{invalid_filters.join(", ")} #{verb} not"
  end
end