# typed: true
# frozen_string_literal: true

require "formula"
require "cask/cask_loader"

# Helper module for validating syntax in taps.
#
# @api private
module Readall
  class << self
    def valid_ruby_syntax?(ruby_files)
      failed = T.let(false, T::Boolean)
      ruby_files.each do |ruby_file|
        # As a side effect, print syntax errors/warnings to `$stderr`.
        failed = true if syntax_errors_or_warnings?(ruby_file)
      end
      !failed
    end

    def valid_aliases?(alias_dir, formula_dir)
      return true unless alias_dir.directory?

      failed = T.let(false, T::Boolean)
      alias_dir.each_child do |f|
        if !f.symlink?
          onoe "Non-symlink alias: #{f}"
          failed = true
        elsif !f.file?
          onoe "Non-file alias: #{f}"
          failed = true
        end

        if (formula_dir/"#{f.basename}.rb").exist?
          onoe "Formula duplicating alias: #{f}"
          failed = true
        end
      end
      !failed
    end

    def valid_formulae?(formulae, bottle_tag: nil)
      success = T.let(true, T::Boolean)
      formulae.each do |file|
        base = Formulary.factory(file)
        next if bottle_tag.blank? || !base.path.exist? || !base.class.on_system_blocks_exist?

        formula_contents = base.path.read

        readall_namespace = Formulary.class_s("Readall#{bottle_tag.to_sym.capitalize}")
        readall_formula_class = Formulary.load_formula(base.name, base.path, formula_contents, readall_namespace,
                                                       flags: base.class.build_flags, ignore_errors: true)
        readall_formula_class.new(base.name, base.path, :stable,
                                  alias_path: base.alias_path, force_bottle: base.force_bottle)
      rescue Interrupt
        raise
      rescue Exception => e # rubocop:disable Lint/RescueException
        onoe "Invalid formula (#{bottle_tag}): #{file}"
        $stderr.puts e
        success = false
      end
      success
    end

    def valid_casks?(_casks, os_name: nil, arch: nil)
      true
    end

    def valid_tap?(tap, aliases: false, no_simulate: false, os_arch_combinations: nil)
      success = true

      if aliases
        valid_aliases = valid_aliases?(tap.alias_dir, tap.formula_dir)
        success = false unless valid_aliases
      end
      if no_simulate
        success = false unless valid_formulae?(tap.formula_files)
        success = false unless valid_casks?(tap.cask_files)
      else
        # TODO: Remove this default case once `--os` and `--arch` are passed explicitly to `brew readall` in CI.
        os_arch_combinations ||= [*MacOSVersion::SYMBOLS.keys, :linux].product(OnSystem::ARCH_OPTIONS)

        os_arch_combinations.each do |os, arch|
          bottle_tag = Utils::Bottles::Tag.new(system: os, arch: arch)
          next unless bottle_tag.valid_combination?

          Homebrew::SimulateSystem.with os: os, arch: arch do
            success = false unless valid_formulae?(tap.formula_files, bottle_tag: bottle_tag)
            success = false unless valid_casks?(tap.cask_files, os_name: os, arch: arch)
          end
        end
      end

      success
    end

    private

    def syntax_errors_or_warnings?(filename)
      # Retrieve messages about syntax errors/warnings printed to `$stderr`.
      _, err, status = system_command(RUBY_PATH, args: ["-c", "-w", filename], print_stderr: false)

      # Ignore unnecessary warning about named capture conflicts.
      # See https://bugs.ruby-lang.org/issues/12359.
      messages = err.lines
                    .grep_v(/named capture conflicts a local variable/)
                    .join

      $stderr.print messages

      # Only syntax errors result in a non-zero status code. To detect syntax
      # warnings we also need to inspect the output to `$stderr`.
      !status.success? || !messages.chomp.empty?
    end
  end
end

require "extend/os/readall"