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# frozen_string_literal: true

require_relative "user_interaction"

class Gem::SpecificationPolicy
  include Gem::UserInteraction

  VALID_NAME_PATTERN = /\A[a-zA-Z0-9\.\-\_]+\z/ # :nodoc:

  SPECIAL_CHARACTERS = /\A[#{Regexp.escape(".-_")}]+/ # :nodoc:

  VALID_URI_PATTERN = %r{\Ahttps?:\/\/([^\s:@]+:[^\s:@]*@)?[A-Za-z\d\-]+(\.[A-Za-z\d\-]+)+\.?(:\d{1,5})?([\/?]\S*)?\z} # :nodoc:

  METADATA_LINK_KEYS = %w[
    homepage_uri
    changelog_uri
    source_code_uri
    documentation_uri
    wiki_uri
    mailing_list_uri
    bug_tracker_uri
    download_uri
    funding_uri
  ].freeze # :nodoc:

  def initialize(specification)
    @warnings = 0

    @specification = specification
  end

  ##
  # If set to true, run packaging-specific checks, as well.

  attr_accessor :packaging

  ##
  # Does a sanity check on the specification.
  #
  # Raises InvalidSpecificationException if the spec does not pass the
  # checks.
  #
  # It also performs some validations that do not raise but print warning
  # messages instead.

  def validate(strict = false)
    validate_required!
    validate_required_metadata!

    validate_optional(strict) if packaging || strict

    true
  end

  ##
  # Does a sanity check on the specification.
  #
  # Raises InvalidSpecificationException if the spec does not pass the
  # checks.
  #
  # Only runs checks that are considered necessary for the specification to be
  # functional.

  def validate_required!
    validate_nil_attributes

    validate_rubygems_version

    validate_required_attributes

    validate_name

    validate_require_paths

    @specification.keep_only_files_and_directories

    validate_non_files

    validate_self_inclusion_in_files_list

    validate_specification_version

    validate_platform

    validate_array_attributes

    validate_authors_field

    validate_licenses_length

    validate_duplicate_dependencies
  end

  def validate_required_metadata!
    validate_metadata

    validate_lazy_metadata
  end

  def validate_optional(strict)
    validate_licenses

    validate_permissions

    validate_values

    validate_dependencies

    validate_required_ruby_version

    validate_extensions

    validate_removed_attributes

    validate_unique_links

    if @warnings > 0
      if strict
        error "specification has warnings"
      else
        alert_warning help_text
      end
    end
  end

  ##
  # Implementation for Specification#validate_for_resolution

  def validate_for_resolution
    validate_required!
  end

  ##
  # Implementation for Specification#validate_metadata

  def validate_metadata
    metadata = @specification.metadata

    unless Hash === metadata
      error "metadata must be a hash"
    end

    metadata.each do |key, value|
      entry = "metadata['#{key}']"
      unless key.is_a?(String)
        error "metadata keys must be a String"
      end

      if key.size > 128
        error "metadata key is too large (#{key.size} > 128)"
      end

      unless value.is_a?(String)
        error "#{entry} value must be a String"
      end

      if value.size > 1024
        error "#{entry} value is too large (#{value.size} > 1024)"
      end

      next unless METADATA_LINK_KEYS.include? key
      unless VALID_URI_PATTERN.match?(value)
        error "#{entry} has invalid link: #{value.inspect}"
      end
    end
  end

  ##
  # Checks that no duplicate dependencies are specified.

  def validate_duplicate_dependencies # :nodoc:
    # NOTE: see REFACTOR note in Gem::Dependency about types - this might be brittle
    seen = Gem::Dependency::TYPES.inject({}) {|types, type| types.merge({ type => {} }) }

    error_messages = []
    @specification.dependencies.each do |dep|
      if prev = seen[dep.type][dep.name]
        error_messages << <<-MESSAGE
duplicate dependency on #{dep}, (#{prev.requirement}) use:
    add_#{dep.type}_dependency \"#{dep.name}\", \"#{dep.requirement}\", \"#{prev.requirement}\"
        MESSAGE
      end

      seen[dep.type][dep.name] = dep
    end
    if error_messages.any?
      error error_messages.join
    end
  end

  ##
  # Checks that the gem does not depend on itself.
  # Checks that dependencies use requirements as we recommend.  Warnings are
  # issued when dependencies are open-ended or overly strict for semantic
  # versioning.

  def validate_dependencies # :nodoc:
    warning_messages = []
    @specification.dependencies.each do |dep|
      if dep.name == @specification.name # warn on self reference
        warning_messages << "Self referencing dependency is unnecessary and strongly discouraged."
      end

      prerelease_dep = dep.requirements_list.any? do |req|
        Gem::Requirement.new(req).prerelease?
      end

      warning_messages << "prerelease dependency on #{dep} is not recommended" if
          prerelease_dep && !@specification.version.prerelease?

      open_ended = dep.requirement.requirements.all? do |op, version|
        !version.prerelease? && [">", ">="].include?(op)
      end

      next unless open_ended
      op, dep_version = dep.requirement.requirements.first

      segments = dep_version.segments

      base = segments.first 2

      recommendation = if [">", ">="].include?(op) && segments == [0]
        "  use a bounded requirement, such as \"~> x.y\""
      else
        bugfix = if op == ">"
          ", \"> #{dep_version}\""
        elsif op == ">=" && base != segments
          ", \">= #{dep_version}\""
        end

        "  if #{dep.name} is semantically versioned, use:\n" \
        "    add_#{dep.type}_dependency \"#{dep.name}\", \"~> #{base.join "."}\"#{bugfix}"
      end

      warning_messages << ["open-ended dependency on #{dep} is not recommended", recommendation].join("\n") + "\n"
    end
    if warning_messages.any?
      warning_messages.each {|warning_message| warning warning_message }
    end
  end

  def validate_required_ruby_version
    if @specification.required_ruby_version.requirements == [Gem::Requirement::DefaultRequirement]
      warning "make sure you specify the oldest ruby version constraint (like \">= 3.0\") that you want your gem to support by setting the `required_ruby_version` gemspec attribute"
    end
  end

  ##
  # Issues a warning for each file to be packaged which is world-readable.
  #
  # Implementation for Specification#validate_permissions

  def validate_permissions
    return if Gem.win_platform?

    @specification.files.each do |file|
      next unless File.file?(file)
      next if File.stat(file).mode & 0o444 == 0o444
      warning "#{file} is not world-readable"
    end

    @specification.executables.each do |name|
      exec = File.join @specification.bindir, name
      next unless File.file?(exec)
      next if File.stat(exec).executable?
      warning "#{exec} is not executable"
    end
  end

  private

  def validate_nil_attributes
    nil_attributes = Gem::Specification.non_nil_attributes.select do |attrname|
      @specification.instance_variable_get("@#{attrname}").nil?
    end
    return if nil_attributes.empty?
    error "#{nil_attributes.join ", "} must not be nil"
  end

  def validate_rubygems_version
    return unless packaging

    rubygems_version = @specification.rubygems_version

    return if rubygems_version == Gem::VERSION

    warning "expected RubyGems version #{Gem::VERSION}, was #{rubygems_version}"

    @specification.rubygems_version = Gem::VERSION
  end

  def validate_required_attributes
    Gem::Specification.required_attributes.each do |symbol|
      unless @specification.send symbol
        error "missing value for attribute #{symbol}"
      end
    end
  end

  def validate_name
    name = @specification.name

    if !name.is_a?(String)
      error "invalid value for attribute name: \"#{name.inspect}\" must be a string"
    elsif !/[a-zA-Z]/.match?(name)
      error "invalid value for attribute name: #{name.dump} must include at least one letter"
    elsif !VALID_NAME_PATTERN.match?(name)
      error "invalid value for attribute name: #{name.dump} can only include letters, numbers, dashes, and underscores"
    elsif SPECIAL_CHARACTERS.match?(name)
      error "invalid value for attribute name: #{name.dump} cannot begin with a period, dash, or underscore"
    end
  end

  def validate_require_paths
    return unless @specification.raw_require_paths.empty?

    error "specification must have at least one require_path"
  end

  def validate_non_files
    return unless packaging

    non_files = @specification.files.reject {|x| File.file?(x) || File.symlink?(x) }

    unless non_files.empty?
      error "[\"#{non_files.join "\", \""}\"] are not files"
    end
  end

  def validate_self_inclusion_in_files_list
    file_name = @specification.file_name

    return unless @specification.files.include?(file_name)

    error "#{@specification.full_name} contains itself (#{file_name}), check your files list"
  end

  def validate_specification_version
    return if @specification.specification_version.is_a?(Integer)

    error "specification_version must be an Integer (did you mean version?)"
  end

  def validate_platform
    platform = @specification.platform

    case platform
    when Gem::Platform, Gem::Platform::RUBY # ok
    else
      error "invalid platform #{platform.inspect}, see Gem::Platform"
    end
  end

  def validate_array_attributes
    Gem::Specification.array_attributes.each do |field|
      validate_array_attribute(field)
    end
  end

  def validate_array_attribute(field)
    val = @specification.send(field)
    klass = case field
            when :dependencies then
              Gem::Dependency
            else
              String
    end

    unless Array === val && val.all? {|x| x.is_a?(klass) || (field == :licenses && x.nil?) }
      error "#{field} must be an Array of #{klass}"
    end
  end

  def validate_authors_field
    return unless @specification.authors.empty?

    error "authors may not be empty"
  end

  def validate_licenses_length
    licenses = @specification.licenses

    licenses.each do |license|
      next if license.nil?

      if license.length > 64
        error "each license must be 64 characters or less"
      end
    end
  end

  def validate_licenses
    licenses = @specification.licenses

    licenses.each do |license|
      next if Gem::Licenses.match?(license) || license.nil?
      license_id_deprecated = Gem::Licenses.deprecated_license_id?(license)
      exception_id_deprecated = Gem::Licenses.deprecated_exception_id?(license)
      suggestions = Gem::Licenses.suggestions(license)

      if license_id_deprecated
        main_message = "License identifier '#{license}' is deprecated"
      elsif exception_id_deprecated
        main_message = "Exception identifier at '#{license}' is deprecated"
      else
        main_message = "License identifier '#{license}' is invalid"
      end

      message = <<-WARNING
#{main_message}. Use an identifier from
https://spdx.org/licenses or '#{Gem::Licenses::NONSTANDARD}' for a nonstandard license,
or set it to nil if you don't want to specify a license.
      WARNING
      message += "Did you mean #{suggestions.map {|s| "'#{s}'" }.join(", ")}?\n" unless suggestions.nil?
      warning(message)
    end

    warning <<-WARNING if licenses.empty?
licenses is empty, but is recommended. Use an license identifier from
https://spdx.org/licenses or '#{Gem::Licenses::NONSTANDARD}' for a nonstandard license,
or set it to nil if you don't want to specify a license.
    WARNING
  end

  LAZY = '"FIxxxXME" or "TOxxxDO"'.gsub(/xxx/, "")
  LAZY_PATTERN = /\AFI XME|\ATO DO/x
  HOMEPAGE_URI_PATTERN = /\A[a-z][a-z\d+.-]*:/i

  def validate_lazy_metadata
    unless @specification.authors.grep(LAZY_PATTERN).empty?
      error "#{LAZY} is not an author"
    end

    unless Array(@specification.email).grep(LAZY_PATTERN).empty?
      error "#{LAZY} is not an email"
    end

    if LAZY_PATTERN.match?(@specification.description)
      error "#{LAZY} is not a description"
    end

    if LAZY_PATTERN.match?(@specification.summary)
      error "#{LAZY} is not a summary"
    end

    homepage = @specification.homepage

    # Make sure a homepage is valid HTTP/HTTPS URI
    if homepage && !homepage.empty?
      require_relative "vendor/uri/lib/uri"
      begin
        homepage_uri = Gem::URI.parse(homepage)
        unless [Gem::URI::HTTP, Gem::URI::HTTPS].member? homepage_uri.class
          error "\"#{homepage}\" is not a valid HTTP URI"
        end
      rescue Gem::URI::InvalidURIError
        error "\"#{homepage}\" is not a valid HTTP URI"
      end
    end
  end

  def validate_values
    %w[author homepage summary files].each do |attribute|
      validate_attribute_present(attribute)
    end

    if @specification.description == @specification.summary
      warning "description and summary are identical"
    end

    # TODO: raise at some given date
    warning "deprecated autorequire specified" if @specification.autorequire

    @specification.executables.each do |executable|
      validate_shebang_line_in(executable)
    end

    @specification.files.select {|f| File.symlink?(f) }.each do |file|
      warning "#{file} is a symlink, which is not supported on all platforms"
    end
  end

  def validate_attribute_present(attribute)
    value = @specification.send attribute
    warning("no #{attribute} specified") if value.nil? || value.empty?
  end

  def validate_shebang_line_in(executable)
    executable_path = File.join(@specification.bindir, executable)
    return if File.read(executable_path, 2) == "#!"

    warning "#{executable_path} is missing #! line"
  end

  def validate_removed_attributes # :nodoc:
    @specification.removed_method_calls.each do |attr|
      warning("#{attr} is deprecated and ignored. Please remove this from your gemspec to ensure that your gem continues to build in the future.")
    end
  end

  def validate_extensions # :nodoc:
    require_relative "ext"
    builder = Gem::Ext::Builder.new(@specification)

    validate_rake_extensions(builder)
    validate_rust_extensions(builder)
  end

  def validate_rust_extensions(builder) # :nodoc:
    rust_extension = @specification.extensions.any? {|s| builder.builder_for(s).is_a? Gem::Ext::CargoBuilder }
    missing_cargo_lock = !@specification.files.any? {|f| f.end_with?("Cargo.lock") }

    error <<-ERROR if rust_extension && missing_cargo_lock
You have specified rust based extension, but Cargo.lock is not part of the gem files. Please run `cargo generate-lockfile` or any other command to generate Cargo.lock and ensure it is added to your gem files section in gemspec.
    ERROR
  end

  def validate_rake_extensions(builder) # :nodoc:
    rake_extension = @specification.extensions.any? {|s| builder.builder_for(s) == Gem::Ext::RakeBuilder }
    rake_dependency = @specification.dependencies.any? {|d| d.name == "rake" && d.type == :runtime }

    warning <<-WARNING if rake_extension && !rake_dependency
You have specified rake based extension, but rake is not added as runtime dependency. It is recommended to add rake as a runtime dependency in gemspec since there's no guarantee rake will be already installed.
    WARNING
  end

  def validate_unique_links
    links = @specification.metadata.slice(*METADATA_LINK_KEYS)
    grouped = links.group_by {|_key, uri| uri }
    grouped.each do |uri, copies|
      next unless copies.length > 1
      keys = copies.map(&:first).join("\n  ")
      warning <<~WARNING
        You have specified the uri:
          #{uri}
        for all of the following keys:
          #{keys}
        Only the first one will be shown on rubygems.org
      WARNING
    end
  end

  def warning(statement) # :nodoc:
    @warnings += 1

    alert_warning statement
  end

  def error(statement) # :nodoc:
    raise Gem::InvalidSpecificationException, statement
  ensure
    alert_warning help_text
  end

  def help_text # :nodoc:
    "See https://guides.rubygems.org/specification-reference/ for help"
  end
end