# typed: false
# frozen_string_literal: true

require "formula"
require "cli/parser"
require "utils/pypi"
require "utils/tar"

module Homebrew
  extend T::Sig

  module_function

  sig { returns(CLI::Parser) }
  def bump_formula_pr_args
    Homebrew::CLI::Parser.new do
      description <<~EOS
        Create a pull request to update <formula> with a new URL or a new tag.

        If a <URL> is specified, the <SHA-256> checksum of the new download should also
        be specified. A best effort to determine the <SHA-256> and <formula> name will
        be made if either or both values are not supplied by the user.

        If a <tag> is specified, the Git commit <revision> corresponding to that tag
        should also be specified. A best effort to determine the <revision> will be made
        if the value is not supplied by the user.

        If a <version> is specified, a best effort to determine the <URL> and <SHA-256> or
        the <tag> and <revision> will be made if both values are not supplied by the user.

        *Note:* this command cannot be used to transition a formula from a
        URL-and-SHA-256 style specification into a tag-and-revision style specification,
        nor vice versa. It must use whichever style specification the formula already uses.
      EOS
      switch "-n", "--dry-run",
             description: "Print what would be done rather than doing it."
      switch "--write",
             description: "Make the expected file modifications without taking any Git actions."
      switch "--commit",
             depends_on:  "--write",
             description: "When passed with `--write`, generate a new commit after writing changes "\
                          "to the formula file."
      switch "--no-audit",
             description: "Don't run `brew audit` before opening the PR."
      switch "--strict",
             description: "Run `brew audit --strict` before opening the PR."
      switch "--online",
             description: "Run `brew audit --online` before opening the PR."
      switch "--no-browse",
             description: "Print the pull request URL instead of opening in a browser."
      switch "--no-fork",
             description: "Don't try to fork the repository."
      comma_array "--mirror",
                  description: "Use the specified <URL> as a mirror URL. If <URL> is a comma-separated list "\
                               "of URLs, multiple mirrors will be added."
      flag   "--version=",
             description: "Use the specified <version> to override the value parsed from the URL or tag. Note "\
                          "that `--version=0` can be used to delete an existing version override from a "\
                          "formula if it has become redundant."
      flag   "--message=",
             description: "Append <message> to the default pull request message."
      flag   "--url=",
             description: "Specify the <URL> for the new download. If a <URL> is specified, the <SHA-256> "\
                          "checksum of the new download should also be specified."
      flag   "--sha256=",
             depends_on:  "--url=",
             description: "Specify the <SHA-256> checksum of the new download."
      flag   "--tag=",
             description: "Specify the new git commit <tag> for the formula."
      flag   "--revision=",
             description: "Specify the new commit <revision> corresponding to the specified git <tag> "\
                          "or specified <version>."
      switch "-f", "--force",
             description: "Ignore duplicate open PRs. Remove all mirrors if `--mirror` was not specified."

      conflicts "--dry-run", "--write"
      conflicts "--no-audit", "--strict"
      conflicts "--no-audit", "--online"
      conflicts "--url", "--tag"

      named_args :formula, max: 1
    end
  end

  def use_correct_linux_tap(formula, args:)
    default_origin_branch = formula.tap.path.git_origin_branch

    return formula.tap.full_name, "origin", default_origin_branch, "-" if !OS.linux? || !formula.tap.core_tap?

    tap_full_name = formula.tap.full_name.gsub("linuxbrew", "homebrew")
    homebrew_core_url = "https://github.com/#{tap_full_name}"
    homebrew_core_remote = "homebrew"
    previous_branch = formula.tap.path.git_branch || "master"
    formula_path = formula.path.relative_path_from(formula.tap.path)
    full_origin_branch = "#{homebrew_core_remote}/#{default_origin_branch}"

    if args.dry_run? || args.write?
      ohai "git remote add #{homebrew_core_remote} #{homebrew_core_url}"
      ohai "git fetch #{homebrew_core_remote} HEAD #{default_origin_branch}"
      ohai "git cat-file -e #{full_origin_branch}:#{formula_path}"
      ohai "git checkout #{full_origin_branch}"
      return tap_full_name, homebrew_core_remote, default_origin_branch, previous_branch
    end

    formula.tap.path.cd do
      unless Utils.popen_read("git", "remote", "-v").match?(%r{^homebrew.*Homebrew/homebrew-core.*$})
        ohai "Adding #{homebrew_core_remote} remote"
        safe_system "git", "remote", "add", homebrew_core_remote, homebrew_core_url
      end
      ohai "Fetching remote #{homebrew_core_remote}"
      safe_system "git", "fetch", homebrew_core_remote, "HEAD", default_origin_branch
      if quiet_system "git", "cat-file", "-e", "#{full_origin_branch}:#{formula_path}"
        ohai "#{formula.full_name} exists in #{full_origin_branch}."
        safe_system "git", "checkout", full_origin_branch
        return tap_full_name, homebrew_core_remote, default_origin_branch, previous_branch
      end
    end
  end

  def bump_formula_pr
    args = bump_formula_pr_args.parse

    if args.revision.present? && args.tag.nil? && args.version.nil?
      raise UsageError, "`--revision` must be passed with either `--tag` or `--version`!"
    end

    # As this command is simplifying user-run commands then let's just use a
    # user path, too.
    ENV["PATH"] = ENV["HOMEBREW_PATH"]

    # Use the user's browser, too.
    ENV["BROWSER"] = Homebrew::EnvConfig.browser

    formula = args.named.to_formulae.first

    new_url = args.url
    formula ||= determine_formula_from_url(new_url) if new_url.present?
    raise FormulaUnspecifiedError if formula.blank?

    odie "This formula is disabled!" if formula.disabled?
    odie "This formula is deprecated and does not build!" if formula.deprecation_reason == :does_not_build
    odie "This formula is not in a tap!" if formula.tap.blank?
    odie "This formula's tap is not a Git repository!" unless formula.tap.git?

    formula_spec = formula.stable
    odie "#{formula}: no stable specification found!" if formula_spec.blank?

    tap_full_name, remote, remote_branch, previous_branch = use_correct_linux_tap(formula, args: args)
    check_open_pull_requests(formula, tap_full_name, args: args)

    new_version = args.version
    check_new_version(formula, tap_full_name, version: new_version, args: args) if new_version.present?

    opoo "This formula has patches that may be resolved upstream." if formula.patchlist.present?
    if formula.resources.any? { |resource| !resource.name.start_with?("homebrew-") }
      opoo "This formula has resources that may need to be updated."
    end

    old_mirrors = formula_spec.mirrors
    new_mirrors ||= args.mirror
    new_mirror ||= determine_mirror(new_url)
    new_mirrors ||= [new_mirror] if new_mirror.present?

    check_for_mirrors(formula, old_mirrors, new_mirrors, args: args) if new_url.present?

    old_hash = formula_spec.checksum&.hexdigest
    new_hash = args.sha256
    new_tag = args.tag
    new_revision = args.revision
    old_url = formula_spec.url
    old_tag = formula_spec.specs[:tag]
    old_formula_version = formula_version(formula)
    old_version = old_formula_version.to_s
    forced_version = new_version.present?
    new_url_hash = if new_url.present? && new_hash.present?
      check_new_version(formula, tap_full_name, url: new_url, args: args) if new_version.blank?
      true
    elsif new_tag.present? && new_revision.present?
      check_new_version(formula, tap_full_name, url: old_url, tag: new_tag, args: args) if new_version.blank?
      false
    elsif old_hash.blank?
      if new_tag.blank? && new_version.blank? && new_revision.blank?
        raise UsageError, "#{formula}: no --tag= or --version= argument specified!"
      end

      if old_tag.present?
        new_tag ||= old_tag.gsub(old_version, new_version)
        if new_tag == old_tag
          odie <<~EOS
            You need to bump this formula manually since the new tag
            and old tag are both #{new_tag}.
          EOS
        end
        check_new_version(formula, tap_full_name, url: old_url, tag: new_tag, args: args) if new_version.blank?
        resource_path, forced_version = fetch_resource(formula, new_version, old_url, tag: new_tag)
        new_revision = Utils.popen_read("git", "-C", resource_path.to_s, "rev-parse", "-q", "--verify", "HEAD")
        new_revision = new_revision.strip
      elsif new_revision.blank?
        odie "#{formula}: the current URL requires specifying a `--revision=` argument."
      end
      false
    elsif new_url.blank? && new_version.blank?
      raise UsageError, "#{formula}: no --url= or --version= argument specified!"
    else
      new_url ||= PyPI.update_pypi_url(old_url, new_version)
      if new_url.blank?
        new_url = old_url.gsub(old_version, new_version)
        if new_mirrors.blank? && old_mirrors.present?
          new_mirrors = old_mirrors.map do |old_mirror|
            old_mirror.gsub(old_version, new_version)
          end
        end
      end
      if new_url == old_url
        odie <<~EOS
          You need to bump this formula manually since the new URL
          and old URL are both:
            #{new_url}
        EOS
      end
      check_new_version(formula, tap_full_name, url: new_url, args: args) if new_version.blank?
      resource_path, forced_version = fetch_resource(formula, new_version, new_url)
      Utils::Tar.validate_file(resource_path)
      new_hash = resource_path.sha256
    end

    replacement_pairs = []
    if formula.revision.nonzero?
      replacement_pairs << [
        /^  revision \d+\n(\n(  head "))?/m,
        "\\2",
      ]
    end

    replacement_pairs += formula_spec.mirrors.map do |mirror|
      [
        / +mirror "#{Regexp.escape(mirror)}"\n/m,
        "",
      ]
    end

    replacement_pairs += if new_url_hash.present?
      [
        [
          /#{Regexp.escape(formula_spec.url)}/,
          new_url,
        ],
        [
          old_hash,
          new_hash,
        ],
      ]
    elsif new_tag.present?
      [
        [
          formula_spec.specs[:tag],
          new_tag,
        ],
        [
          formula_spec.specs[:revision],
          new_revision,
        ],
      ]
    elsif new_url.present?
      [
        [
          /#{Regexp.escape(formula_spec.url)}/,
          new_url,
        ],
        [
          formula_spec.specs[:revision],
          new_revision,
        ],
      ]
    else
      [
        [
          formula_spec.specs[:revision],
          new_revision,
        ],
      ]
    end

    old_contents = formula.path.read

    if new_mirrors.present?
      replacement_pairs << [
        /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
        "\\1\\2\\1mirror \"#{new_mirrors.join("\"\n\\1mirror \"")}\"\n",
      ]
    end

    # When bumping a linux-only formula, one needs to also delete the
    # sha256 linux bottle line if it exists. That's because of running
    # test-bot with --keep-old option in linuxbrew-core.
    if old_contents.include?("depends_on :linux") && old_contents.include?("=> :x86_64_linux")
      replacement_pairs << [
        /^    sha256 ".+" => :x86_64_linux\n/m,
        "\\2",
      ]
    end

    if forced_version && new_version != "0"
      replacement_pairs << if old_contents.include?("version \"#{old_formula_version}\"")
        [
          old_formula_version.to_s,
          new_version,
        ]
      elsif new_mirrors.present?
        [
          /^( +)(mirror "#{Regexp.escape(new_mirrors.last)}"\n)/m,
          "\\1\\2\\1version \"#{new_version}\"\n",
        ]
      elsif new_url.present?
        [
          /^( +)(url "#{Regexp.escape(new_url)}"\n)/m,
          "\\1\\2\\1version \"#{new_version}\"\n",
        ]
      elsif new_revision.present?
        [
          /^( {2})( +)(:revision => "#{new_revision}"\n)/m,
          "\\1\\2\\3\\1version \"#{new_version}\"\n",
        ]
      end
    elsif forced_version && new_version == "0"
      replacement_pairs << [
        /^  version "[\w.\-+]+"\n/m,
        "",
      ]
    end
    new_contents = Utils::Inreplace.inreplace_pairs(formula.path,
                                                    replacement_pairs.uniq.compact,
                                                    read_only_run: args.dry_run?,
                                                    silent:        args.quiet?)

    new_formula_version = formula_version(formula, new_contents)

    if new_formula_version < old_formula_version
      formula.path.atomic_write(old_contents) unless args.dry_run?
      odie <<~EOS
        You need to bump this formula manually since changing the version
        from #{old_formula_version} to #{new_formula_version} would be a downgrade.
      EOS
    elsif new_formula_version == old_formula_version
      formula.path.atomic_write(old_contents) unless args.dry_run?
      odie <<~EOS
        You need to bump this formula manually since the new version
        and old version are both #{new_formula_version}.
      EOS
    end

    alias_rename = alias_update_pair(formula, new_formula_version)
    if alias_rename.present?
      ohai "Renaming alias #{alias_rename.first} to #{alias_rename.last}"
      alias_rename.map! { |a| formula.tap.alias_dir/a }
    end

    unless args.dry_run?
      resources_checked = PyPI.update_python_resources! formula, version: new_formula_version,
                                                        silent: args.quiet?, ignore_non_pypi_packages: true
    end

    run_audit(formula, alias_rename, old_contents, args: args)

    pr_message = "Created with `brew bump-formula-pr`."
    if resources_checked.nil? && formula.resources.any? { |resource| !resource.name.start_with?("homebrew-") }
      pr_message += <<~EOS


        `resource` blocks may require updates.
      EOS
    end

    pr_info = {
      sourcefile_path:  formula.path,
      old_contents:     old_contents,
      additional_files: alias_rename,
      remote:           remote,
      remote_branch:    remote_branch,
      branch_name:      "bump-#{formula.name}-#{new_formula_version}",
      commit_message:   "#{formula.name} #{new_formula_version}",
      previous_branch:  previous_branch,
      tap:              formula.tap,
      tap_full_name:    tap_full_name,
      pr_message:       pr_message,
    }
    GitHub.create_bump_pr(pr_info, args: args)
  end

  def determine_formula_from_url(url)
    # Split the new URL on / and find any formulae that have the same URL
    # except for the last component, but don't try to match any more than the
    # first five components since sometimes the last component isn't the only
    # one to change.
    url_split = url.split("/")
    maximum_url_components_to_match = 5
    components_to_match = [url_split.count - 1, maximum_url_components_to_match].min
    base_url = url_split.first(components_to_match).join("/")
    base_url = /#{Regexp.escape(base_url)}/
    guesses = []
    Formula.each do |f|
      guesses << f if f.stable&.url&.match(base_url)
    end
    return guesses.shift if guesses.count == 1
    return if guesses.count <= 1

    odie "Couldn't guess formula for sure; could be one of these:\n#{guesses.map(&:name).join(", ")}"
  end

  def determine_mirror(url)
    case url
    when %r{.*ftp.gnu.org/gnu.*}
      url.sub "ftp.gnu.org/gnu", "ftpmirror.gnu.org"
    when %r{.*download.savannah.gnu.org/*}
      url.sub "download.savannah.gnu.org", "download-mirror.savannah.gnu.org"
    when %r{.*www.apache.org/dyn/closer.lua\?path=.*}
      url.sub "www.apache.org/dyn/closer.lua?path=", "archive.apache.org/dist/"
    when %r{.*mirrors.ocf.berkeley.edu/debian.*}
      url.sub "mirrors.ocf.berkeley.edu/debian", "mirrorservice.org/sites/ftp.debian.org/debian"
    end
  end

  def check_for_mirrors(formula, old_mirrors, new_mirrors, args:)
    return if new_mirrors.present? || old_mirrors.empty?

    if args.force?
      opoo "#{formula}: Removing all mirrors because a `--mirror=` argument was not specified."
    else
      odie <<~EOS
        #{formula}: a `--mirror=` argument for updating the mirror URL(s) was not specified.
        Use `--force` to remove all mirrors.
      EOS
    end
  end

  def fetch_resource(formula, new_version, url, **specs)
    resource = Resource.new
    resource.url(url, specs)
    resource.owner = Resource.new(formula.name)
    forced_version = new_version && new_version != resource.version
    resource.version = new_version if forced_version
    odie "No `--version=` argument specified!" if resource.version.blank?
    [resource.fetch, forced_version]
  end

  def formula_version(formula, contents = nil)
    spec = :stable
    name = formula.name
    path = formula.path
    if contents.present?
      Formulary.from_contents(name, path, contents, spec).version
    else
      Formulary::FormulaLoader.new(name, path).get_formula(spec).version
    end
  end

  def check_open_pull_requests(formula, tap_full_name, args:)
    GitHub.check_for_duplicate_pull_requests(formula.name, tap_full_name,
                                             state: "open",
                                             file:  formula.path.relative_path_from(formula.tap.path).to_s,
                                             args:  args)
  end

  def check_new_version(formula, tap_full_name, args:, version: nil, url: nil, tag: nil)
    if version.nil?
      specs = {}
      specs[:tag] = tag if tag.present?
      version = Version.detect(url, **specs)
    end
    check_throttle(formula, version)
    check_closed_pull_requests(formula, tap_full_name, args: args, version: version)
  end

  def check_throttle(formula, new_version)
    throttled_rate = formula.tap.audit_exceptions.dig(:throttled_formulae, formula.name)
    return if throttled_rate.blank?

    formula_suffix = Version.new(new_version).patch.to_i
    return if formula_suffix.modulo(throttled_rate).zero?

    odie "#{formula} should only be updated every #{throttled_rate} releases on multiples of #{throttled_rate}"
  end

  def check_closed_pull_requests(formula, tap_full_name, args:, version:)
    # if we haven't already found open requests, try for an exact match across closed requests
    GitHub.check_for_duplicate_pull_requests(formula.name, tap_full_name,
                                             version: version,
                                             state:   "closed",
                                             file:    formula.path.relative_path_from(formula.tap.path).to_s,
                                             args:    args)
  end

  def alias_update_pair(formula, new_formula_version)
    versioned_alias = formula.aliases.grep(/^.*@\d+(\.\d+)?$/).first
    return if versioned_alias.nil?

    name, old_alias_version = versioned_alias.split("@")
    new_alias_regex = (old_alias_version.split(".").length == 1) ? /^\d+/ : /^\d+\.\d+/
    new_alias_version, = *new_formula_version.to_s.match(new_alias_regex)
    return if Version.create(new_alias_version) <= Version.create(old_alias_version)

    [versioned_alias, "#{name}@#{new_alias_version}"]
  end

  def run_audit(formula, alias_rename, old_contents, args:)
    audit_args = ["--formula"]
    audit_args << "--strict" if args.strict?
    audit_args << "--online" if args.online?
    if args.dry_run?
      if args.no_audit?
        ohai "Skipping `brew audit`"
      elsif audit_args.present?
        ohai "brew audit #{audit_args.join(" ")} #{formula.path.basename}"
      else
        ohai "brew audit #{formula.path.basename}"
      end
      return
    end
    FileUtils.mv alias_rename.first, alias_rename.last if alias_rename.present?
    failed_audit = false
    if args.no_audit?
      ohai "Skipping `brew audit`"
    elsif audit_args.present?
      system HOMEBREW_BREW_FILE, "audit", *audit_args, formula.path
      failed_audit = !$CHILD_STATUS.success?
    else
      system HOMEBREW_BREW_FILE, "audit", formula.path
      failed_audit = !$CHILD_STATUS.success?
    end
    return unless failed_audit

    formula.path.atomic_write(old_contents)
    FileUtils.mv alias_rename.last, alias_rename.first if alias_rename.present?
    odie "`brew audit` failed!"
  end
end
