# typed: strict
# frozen_string_literal: true

require "version/parser"

# A formula's version.
class Version
  include Comparable

  sig { params(name: T.any(String, Symbol), full: T::Boolean).returns(Regexp) }
  def self.formula_optionally_versioned_regex(name, full: true)
    /#{"^" if full}#{Regexp.escape(name)}(@\d[\d.]*)?#{"$" if full}/
  end

  # A part of a {Version}.
  class Token
    extend T::Helpers
    abstract!

    include Comparable

    sig { params(val: String).returns(Token) }
    def self.create(val)
      case val
      when /\A#{AlphaToken::PATTERN}\z/o   then AlphaToken
      when /\A#{BetaToken::PATTERN}\z/o    then BetaToken
      when /\A#{RCToken::PATTERN}\z/o      then RCToken
      when /\A#{PreToken::PATTERN}\z/o     then PreToken
      when /\A#{PatchToken::PATTERN}\z/o   then PatchToken
      when /\A#{PostToken::PATTERN}\z/o    then PostToken
      when /\A#{NumericToken::PATTERN}\z/o then NumericToken
      when /\A#{StringToken::PATTERN}\z/o  then StringToken
      else raise "Cannot find a matching token pattern"
      end.new(val)
    end

    sig { params(val: T.untyped).returns(T.nilable(Token)) }
    def self.from(val)
      return NULL_TOKEN if val.nil? || (val.respond_to?(:null?) && val.null?)

      case val
      when Token   then val
      when String  then Token.create(val)
      when Integer then Token.create(val.to_s)
      end
    end

    sig { returns(T.nilable(T.any(String, Integer))) }
    attr_reader :value

    sig { params(value: T.nilable(T.any(String, Integer))).void }
    def initialize(value)
      @value = T.let(value, T.untyped)
    end

    sig { abstract.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other); end

    sig { returns(String) }
    def inspect
      "#<#{self.class.name} #{value.inspect}>"
    end

    sig { returns(Integer) }
    def hash
      value.hash
    end

    sig { returns(Float) }
    def to_f
      value.to_f
    end

    sig { returns(Integer) }
    def to_i
      value.to_i
    end

    sig { returns(String) }
    def to_str
      value.to_s
    end

    sig { returns(String) }
    def to_s = to_str

    sig { returns(T::Boolean) }
    def numeric?
      false
    end

    sig { returns(T::Boolean) }
    def null?
      false
    end

    sig { returns(T::Boolean) }
    def blank? = null?
  end

  # A pseudo-token representing the absence of a token.
  class NullToken < Token
    sig { override.returns(NilClass) }
    attr_reader :value

    sig { void }
    def initialize
      super(nil)
    end

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when NullToken
        0
      when NumericToken
        other.value.zero? ? 0 : -1
      when AlphaToken, BetaToken, PreToken, RCToken
        1
      else
        -1
      end
    end

    sig { override.returns(T::Boolean) }
    def null?
      true
    end

    sig { returns(T::Boolean) }
    def blank? = true

    sig { returns(String) }
    def inspect
      "#<#{self.class.name}>"
    end
  end
  private_constant :NullToken

  # Represents the absence of a token.
  NULL_TOKEN = T.let(NullToken.new.freeze, NullToken)

  # A token string.
  class StringToken < Token
    PATTERN = /[a-z]+/i

    sig { override.returns(String) }
    attr_reader :value

    sig { params(value: String).void }
    def initialize(value)
      super(value.to_s)
    end

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when StringToken
        value <=> other.value
      when NumericToken, NullToken
        -T.must(other <=> self)
      end
    end
  end

  # A token consisting of only numbers.
  class NumericToken < Token
    PATTERN = /[0-9]+/i

    sig { override.returns(Integer) }
    attr_reader :value

    sig { params(value: T.any(String, Integer)).void }
    def initialize(value)
      super(value.to_i)
    end

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when NumericToken
        value <=> other.value
      when StringToken
        1
      when NullToken
        -T.must(other <=> self)
      end
    end

    sig { override.returns(T::Boolean) }
    def numeric?
      true
    end
  end

  # A token consisting of an alphabetic and a numeric part.
  class CompositeToken < StringToken
    sig { returns(Integer) }
    def rev
      value[/[0-9]+/].to_i
    end
  end

  # A token representing the part of a version designating it as an alpha release.
  class AlphaToken < CompositeToken
    PATTERN = /alpha[0-9]*|a[0-9]+/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when AlphaToken
        rev <=> other.rev
      when BetaToken, RCToken, PreToken, PatchToken, PostToken
        -1
      else
        super
      end
    end
  end

  # A token representing the part of a version designating it as a beta release.
  class BetaToken < CompositeToken
    PATTERN = /beta[0-9]*|b[0-9]+/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when BetaToken
        rev <=> other.rev
      when AlphaToken
        1
      when PreToken, RCToken, PatchToken, PostToken
        -1
      else
        super
      end
    end
  end

  # A token representing the part of a version designating it as a pre-release.
  class PreToken < CompositeToken
    PATTERN = /pre[0-9]*/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when PreToken
        rev <=> other.rev
      when AlphaToken, BetaToken
        1
      when RCToken, PatchToken, PostToken
        -1
      else
        super
      end
    end
  end

  # A token representing the part of a version designating it as a release candidate.
  class RCToken < CompositeToken
    PATTERN = /rc[0-9]*/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when RCToken
        rev <=> other.rev
      when AlphaToken, BetaToken, PreToken
        1
      when PatchToken, PostToken
        -1
      else
        super
      end
    end
  end

  # A token representing the part of a version designating it as a patch release.
  class PatchToken < CompositeToken
    PATTERN = /p[0-9]*/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when PatchToken
        rev <=> other.rev
      when AlphaToken, BetaToken, RCToken, PreToken
        1
      else
        super
      end
    end
  end

  # A token representing the part of a version designating it as a post release.
  class PostToken < CompositeToken
    PATTERN = /.post[0-9]+/i

    sig { override.params(other: T.untyped).returns(T.nilable(Integer)) }
    def <=>(other)
      return unless (other = Token.from(other))

      case other
      when PostToken
        rev <=> other.rev
      when AlphaToken, BetaToken, RCToken, PreToken
        1
      else
        super
      end
    end
  end

  SCAN_PATTERN = T.let(Regexp.union(
    AlphaToken::PATTERN,
    BetaToken::PATTERN,
    PreToken::PATTERN,
    RCToken::PATTERN,
    PatchToken::PATTERN,
    PostToken::PATTERN,
    NumericToken::PATTERN,
    StringToken::PATTERN,
  ).freeze, Regexp)
  private_constant :SCAN_PATTERN

  sig { params(url: T.any(String, Pathname), specs: T.untyped).returns(Version) }
  def self.detect(url, **specs)
    parse(specs.fetch(:tag, url), detected_from_url: true)
  end

  sig { params(spec: T.any(String, Pathname), detected_from_url: T::Boolean).returns(Version) }
  def self.parse(spec, detected_from_url: false)
    # This type of full-URL decoding is not technically correct but we only need a rough decode for version parsing.
    spec = URI.decode_www_form_component(spec.to_s) if detected_from_url

    spec = Pathname(spec)

    VERSION_PARSERS.each do |parser|
      version = parser.parse(spec)
      return new(version, detected_from_url:) if version.present?
    end

    NULL
  end

  NUMERIC_WITH_OPTIONAL_DOTS = T.let(/(?:\d+(?:\.\d+)*)/.source.freeze, String)
  private_constant :NUMERIC_WITH_OPTIONAL_DOTS

  NUMERIC_WITH_DOTS = T.let(/(?:\d+(?:\.\d+)+)/.source.freeze, String)
  private_constant :NUMERIC_WITH_DOTS

  MINOR_OR_PATCH = T.let(/(?:\d+(?:\.\d+){1,2})/.source.freeze, String)
  private_constant :MINOR_OR_PATCH

  CONTENT_SUFFIX = T.let(/(?:[._-](?i:bin|dist|stable|src|sources?|final|full))/.source.freeze, String)
  private_constant :CONTENT_SUFFIX

  PRERELEASE_SUFFIX = T.let(/(?:[._-]?(?i:alpha|beta|pre|rc)\.?\d{,2})/.source.freeze, String)
  private_constant :PRERELEASE_SUFFIX

  VERSION_PARSERS = T.let([
    # date-based versioning
    # e.g. `2023-09-28.tar.gz`
    # e.g. `ltopers-v2017-04-14.tar.gz`
    StemParser.new(/(?:^|[._-]?)v?(\d{4}-\d{2}-\d{2})/),

    # GitHub tarballs
    # e.g. `https://github.com/foo/bar/tarball/v1.2.3`
    # e.g. `https://github.com/sam-github/libnet/tarball/libnet-1.1.4`
    # e.g. `https://github.com/isaacs/npm/tarball/v0.2.5-1`
    # e.g. `https://github.com/petdance/ack/tarball/1.93_02`
    UrlParser.new(%r{github\.com/.+/(?:zip|tar)ball/(?:v|\w+-)?((?:\d+[._-])+\d*)$}),

    # e.g. `https://github.com/erlang/otp/tarball/OTP_R15B01 (erlang style)`
    UrlParser.new(/[_-]([Rr]\d+[AaBb]\d*(?:-\d+)?)/),

    # e.g. `boost_1_39_0`
    StemParser.new(/((?:\d+_)+\d+)$/) { |s| s.tr("_", ".") },

    # e.g. `foobar-4.5.1-1`
    # e.g. `unrtf_0.20.4-1`
    # e.g. `ruby-1.9.1-p243`
    StemParser.new(/[_-](#{NUMERIC_WITH_DOTS}-(?:p|P|rc|RC)?\d+)#{CONTENT_SUFFIX}?$/),

    # Hyphenated versions without software-name prefix (e.g. brew-)
    # e.g. `v0.0.8-12.tar.gz`
    # e.g. `3.3.04-1.tar.gz`
    # e.g. `v2.1-20210510.tar.gz`
    # e.g. `2020.11.11-3.tar.gz`
    # e.g. `v3.6.6-0.2`
    StemParser.new(/^v?(#{NUMERIC_WITH_DOTS}(?:-#{NUMERIC_WITH_OPTIONAL_DOTS})+)/),

    # URL with no extension
    # e.g. `https://waf.io/waf-1.8.12`
    # e.g. `https://codeload.github.com/gsamokovarov/jump/tar.gz/v0.7.1`
    UrlParser.new(/[-v](#{NUMERIC_WITH_OPTIONAL_DOTS})$/),

    # e.g. `lame-398-1`
    StemParser.new(/-(\d+-\d+)/),

    # e.g. `foobar-4.5.1`
    StemParser.new(/-(#{NUMERIC_WITH_OPTIONAL_DOTS})$/),

    # e.g. `foobar-4.5.1.post1`
    StemParser.new(/-(#{NUMERIC_WITH_OPTIONAL_DOTS}(.post\d+)?)$/),

    # e.g. `foobar-4.5.1b`
    StemParser.new(/-(#{NUMERIC_WITH_OPTIONAL_DOTS}(?:[abc]|rc|RC)\d*)$/),

    # e.g. `foobar-4.5.0-alpha5, foobar-4.5.0-beta1, or foobar-4.50-beta`
    StemParser.new(/-(#{NUMERIC_WITH_OPTIONAL_DOTS}-(?:alpha|beta|rc)\d*)$/),

    # e.g. `https://ftpmirror.gnu.org/libidn/libidn-1.29-win64.zip`
    # e.g. `https://ftpmirror.gnu.org/libmicrohttpd/libmicrohttpd-0.9.17-w32.zip`
    StemParser.new(/-(#{MINOR_OR_PATCH})-w(?:in)?(?:32|64)$/),

    # Opam packages
    # e.g. `https://opam.ocaml.org/archives/sha.1.9+opam.tar.gz`
    # e.g. `https://opam.ocaml.org/archives/lablgtk.2.18.3+opam.tar.gz`
    # e.g. `https://opam.ocaml.org/archives/easy-format.1.0.2+opam.tar.gz`
    StemParser.new(/\.(#{MINOR_OR_PATCH})\+opam$/),

    # e.g. `https://ftpmirror.gnu.org/mtools/mtools-4.0.18-1.i686.rpm`
    # e.g. `https://ftpmirror.gnu.org/autogen/autogen-5.5.7-5.i386.rpm`
    # e.g. `https://ftpmirror.gnu.org/libtasn1/libtasn1-2.8-x86.zip`
    # e.g. `https://ftpmirror.gnu.org/libtasn1/libtasn1-2.8-x64.zip`
    # e.g. `https://ftpmirror.gnu.org/mtools/mtools_4.0.18_i386.deb`
    StemParser.new(/[_-](#{MINOR_OR_PATCH}(?:-\d+)?)[._-](?:i[36]86|x86|x64(?:[_-](?:32|64))?)$/),

    # e.g. `https://registry.npmjs.org/@angular/cli/-/cli-1.3.0-beta.1.tgz`
    # e.g. `https://github.com/dlang/dmd/archive/v2.074.0-beta1.tar.gz`
    # e.g. `https://github.com/dlang/dmd/archive/v2.074.0-rc1.tar.gz`
    # e.g. `https://github.com/premake/premake-core/releases/download/v5.0.0-alpha10/premake-5.0.0-alpha10-src.zip`
    StemParser.new(/[-.vV]?(#{NUMERIC_WITH_DOTS}#{PRERELEASE_SUFFIX})/),

    # e.g. `foobar4.5.1`
    StemParser.new(/(#{NUMERIC_WITH_OPTIONAL_DOTS})$/),

    # e.g. `foobar-4.5.0-bin`
    StemParser.new(/[-vV](#{NUMERIC_WITH_DOTS}[abc]?)#{CONTENT_SUFFIX}$/),

    # dash version style
    # e.g. `http://www.antlr.org/download/antlr-3.4-complete.jar`
    # e.g. `https://cdn.nuxeo.com/nuxeo-9.2/nuxeo-server-9.2-tomcat.zip`
    # e.g. `https://search.maven.org/remotecontent?filepath=com/facebook/presto/presto-cli/0.181/presto-cli-0.181-executable.jar`
    # e.g. `https://search.maven.org/remotecontent?filepath=org/fusesource/fuse-extra/fusemq-apollo-mqtt/1.3/fusemq-apollo-mqtt-1.3-uber.jar`
    # e.g. `https://search.maven.org/remotecontent?filepath=org/apache/orc/orc-tools/1.2.3/orc-tools-1.2.3-uber.jar`
    StemParser.new(/-(#{NUMERIC_WITH_DOTS})-/),

    # Debian style
    # e.g. `dash_0.5.5.1.orig.tar.gz`
    # e.g. `lcrack_20040914.orig.tar.gz`
    # e.g. `mkcue_1.orig.tar.gz`
    StemParser.new(/_(#{NUMERIC_WITH_OPTIONAL_DOTS}[abc]?)\.orig$/),

    # e.g. `https://www.openssl.org/source/openssl-0.9.8s.tar.gz`
    StemParser.new(/-v?(\d[^-]+)/),

    # e.g. `astyle_1.23_macosx.tar.gz`
    StemParser.new(/_v?(\d[^_]+)/),

    # e.g. `http://mirrors.jenkins-ci.org/war/1.486/jenkins.war`
    # e.g. `https://github.com/foo/bar/releases/download/0.10.11/bar.phar`
    # e.g. `https://github.com/clojure/clojurescript/releases/download/r1.9.293/cljs.jar`
    # e.g. `https://github.com/fibjs/fibjs/releases/download/v0.6.1/fullsrc.zip`
    # e.g. `https://wwwlehre.dhbw-stuttgart.de/~sschulz/WORK/E_DOWNLOAD/V_1.9/E.tgz`
    # e.g. `https://github.com/JustArchi/ArchiSteamFarm/releases/download/2.3.2.0/ASF.zip`
    # e.g. `https://people.gnome.org/~newren/eg/download/1.7.5.2/eg`
    UrlParser.new(%r{/(?:[rvV]_?)?(\d+\.\d+(?:\.\d+){,2})}),

    # e.g. `https://www.ijg.org/files/jpegsrc.v8d.tar.gz`
    StemParser.new(/\.v(\d+[a-z]?)/),

    # e.g. `https://secure.php.net/get/php-7.1.10.tar.bz2/from/this/mirror`
    UrlParser.new(/[-.vV]?(#{NUMERIC_WITH_DOTS}#{PRERELEASE_SUFFIX}?)/),
  ].freeze, T::Array[Version::Parser])
  private_constant :VERSION_PARSERS

  sig { params(val: T.any(String, Version), detected_from_url: T::Boolean).void }
  def initialize(val, detected_from_url: false)
    version = val.to_str
    raise ArgumentError, "Version must not be empty" if version.blank?

    @version = T.let(version, String)
    @detected_from_url = detected_from_url
  end

  sig { returns(T::Boolean) }
  def detected_from_url?
    @detected_from_url
  end

  HEAD_VERSION_REGEX = /\AHEAD(?:-(?<commit>.*))?\Z/
  private_constant :HEAD_VERSION_REGEX

  # Check if this is a HEAD version.
  #
  # @api public
  sig { returns(T::Boolean) }
  def head?
    version&.match?(HEAD_VERSION_REGEX) || false
  end

  # Return the commit for a HEAD version.
  #
  # @api public
  sig { returns(T.nilable(String)) }
  def commit
    version&.match(HEAD_VERSION_REGEX)&.[](:commit)
  end

  # Update the commit for a HEAD version.
  sig { params(commit: T.nilable(String)).void }
  def update_commit(commit)
    raise ArgumentError, "Cannot update commit for non-HEAD version." unless head?

    @version = if commit
      "HEAD-#{commit}"
    else
      "HEAD"
    end
  end

  sig { returns(T::Boolean) }
  def null?
    version.nil?
  end

  sig { params(comparator: String, other: Version).returns(T::Boolean) }
  def compare(comparator, other)
    case comparator
    when ">=" then self >= other
    when ">" then self > other
    when "<" then self < other
    when "<=" then self <= other
    when "==" then self == other
    when "!=" then self != other
    else raise ArgumentError, "Unknown comparator: #{comparator}"
    end
  end

  sig { params(other: T.untyped).returns(T.nilable(Integer)) }
  def <=>(other)
    other = case other
    when String
      if other.blank?
        # Cannot compare `NULL` to empty string.
        return if null?

        return 1
      end

      # Needed to retain API compatibility with older string comparisons for compiler versions, etc.
      Version.new(other)
    when Integer
      # Used by the `*_build_version` comparisons, which formerly returned an integer.
      Version.new(other.to_s)
    when Token
      if other.null?
        # Cannot compare `NULL` to `NULL`.
        return if null?

        return 1
      end

      Version.new(other.to_s)
    when Version
      if other.null?
        # Cannot compare `NULL` to `NULL`.
        return if null?

        return 1
      end

      other
    when nil
      return 1
    else
      return
    end

    # All `other.null?` cases are handled at this point.
    return -1 if null?

    return 0 if version == other.version
    return 1 if head? && !other.head?
    return -1 if !head? && other.head?
    return 0 if head? && other.head?

    ltokens = tokens
    rtokens = other.tokens
    max = max(ltokens.length, rtokens.length)
    l = r = 0

    while l < max
      a = ltokens[l] || NULL_TOKEN
      b = rtokens[r] || NULL_TOKEN

      if a == b
        l += 1
        r += 1
        next
      elsif a.numeric? && !b.numeric?
        return 1 if a > NULL_TOKEN

        l += 1
      elsif !a.numeric? && b.numeric?
        return -1 if b > NULL_TOKEN

        r += 1
      else
        return a <=> b
      end
    end

    0
  end

  sig { override.params(other: T.untyped).returns(T::Boolean) }
  def ==(other)
    # Makes sure that the same instance of Version::NULL
    # will never equal itself; normally Comparable#==
    # will return true for this regardless of the return
    # value of #<=>
    return false if null?

    super
  end
  alias eql? ==

  # The major version.
  #
  # @api public
  sig { returns(T.nilable(Token)) }
  def major
    return NULL_TOKEN if null?

    tokens.first
  end

  # The minor version.
  #
  # @api public
  sig { returns(T.nilable(Token)) }
  def minor
    return NULL_TOKEN if null?

    tokens.second
  end

  # The patch version.
  #
  # @api public
  sig { returns(T.nilable(Token)) }
  def patch
    return NULL_TOKEN if null?

    tokens.third
  end

  # The major and minor version.
  #
  # @api public
  sig { returns(T.self_type) }
  def major_minor
    return self if null?

    major_minor = T.must(tokens[0..1])
    major_minor.empty? ? NULL : self.class.new(major_minor.join("."))
  end

  # The major, minor and patch version.
  #
  # @api public
  sig { returns(T.self_type) }
  def major_minor_patch
    return self if null?

    major_minor_patch = T.must(tokens[0..2])
    major_minor_patch.empty? ? NULL : self.class.new(major_minor_patch.join("."))
  end

  sig { returns(Integer) }
  def hash
    version.hash
  end

  # Convert the version to a floating-point number.
  #
  # @api public
  sig { returns(Float) }
  def to_f
    return Float::NAN if null?

    version.to_f
  end

  # Convert the version to an integer.
  #
  # @api public
  sig { returns(Integer) }
  def to_i
    version.to_i
  end

  # @api public
  sig { returns(String) }
  def to_str
    raise NoMethodError, "undefined method `to_str' for #{self.class}:NULL" if null?

    T.must(version).to_str
  end

  # @api public
  sig { returns(String) }
  def to_s = version.to_s

  sig { params(options: T.untyped).returns(String) }
  def to_json(*options) = version.to_json(*options)

  sig { params(method: T.any(Symbol, String), include_all: T::Boolean).returns(T::Boolean) }
  def respond_to?(method, include_all = false)
    return !null? if ["to_str", :to_str].include?(method)

    super
  end

  sig { returns(String) }
  def inspect
    return "#<Version::NULL>" if null?

    super
  end

  sig { returns(T.self_type) }
  def freeze
    tokens # Determine and store tokens before freezing
    super
  end

  protected

  sig { returns(T.nilable(String)) }
  attr_reader :version

  sig { returns(T::Array[Token]) }
  def tokens
    @tokens ||= T.let(
      version&.scan(SCAN_PATTERN)&.map { |token| Token.create(T.cast(token, String)) } || [],
      T.nilable(T::Array[Token]),
    )
  end

  # Represents the absence of a version.
  #
  # NOTE: Constructor needs to called with an arbitrary non-empty version which is then set to `nil`.
  NULL = T.let(Version.new("NULL").tap { |v| v.instance_variable_set(:@version, nil) }.freeze, Version)

  private

  sig { params(first: Integer, second: Integer).returns(Integer) }
  def max(first, second)
    (first > second) ? first : second
  end
end