module Mjml

# File lib/mjml.rb, line 88
def self.bin_path_from(package_manager)
  stdout, _, status = Open3.capture3("#{package_manager} bin")

  return unless status.success?

  stdout.chomp
rescue Errno::ENOENT # package manager is not installed
  nil
end

# File lib/mjml.rb, line 53
def self.check_for_custom_mjml_binary
  if const_defined?('BIN') && Mjml::BIN.present?
    logger.warn('Setting `Mjml::BIN` is deprecated and will be removed in a future version! Please use `Mjml.mjml_binary=` instead.')
    self.mjml_binary = Mjml::BIN
    remove_const 'BIN'
  end

  return unless mjml_binary.present?

  return mjml_binary if check_version(mjml_binary)

  raise "MJML.mjml_binary is set to '#{mjml_binary}' but MJML-Rails could not validate that it is a valid MJML binary. Please check your configuration."
end

# File lib/mjml.rb, line 83
def self.check_for_global_mjml_binary
  mjml_bin = `which mjml`.chomp
  return mjml_bin if mjml_bin.present? && check_version(mjml_bin)
end

# File lib/mjml.rb, line 75
def self.check_for_npm_mjml_binary
  npm_bin = `which npm`.chomp
  return unless npm_bin.present? && (installer_path = bin_path_from(npm_bin)).present?

  mjml_bin = File.join(installer_path, 'mjml')
  return mjml_bin if check_version(mjml_bin)
end

# File lib/mjml.rb, line 67
def self.check_for_yarn_mjml_binary
  yarn_bin = `which yarn`.chomp
  return unless yarn_bin.present?

  mjml_bin = "#{yarn_bin} run mjml"
  return mjml_bin if check_version(mjml_bin)
end

# File lib/mjml.rb, line 30
def self.check_version(bin)
  stdout, _, status = run_mjml('--version', mjml_bin: bin)
  status.success? && stdout.include?("mjml-core: #{Mjml.mjml_binary_version_supported}")
rescue StandardError
  false
end

# File lib/mjml.rb, line 98
def self.discover_mjml_bin
  logger.warn('`Mjml.discover_mjml_bin` is deprecated and has no effect anymore! Please use `Mjml.mjml_binary=` to set a custom MJML binary.')
end

# File lib/mjml.rb, line 109
def logger
  @logger ||= Logger.new($stdout).tap do |log|
    log.progname = self.name
  end
end

# File lib/mjml.rb, line 37
def self.run_mjml(args, mjml_bin: valid_mjml_binary)
  Open3.capture3("#{mjml_bin} #{args}")
end

# File lib/mjml.rb, line 102
def self.setup
  yield self if block_given?
end

# File lib/mjml.rb, line 41
def self.valid_mjml_binary
  @@valid_mjml_binary ||=
    check_for_custom_mjml_binary ||
    check_for_yarn_mjml_binary ||
    check_for_npm_mjml_binary ||
    check_for_global_mjml_binary

  return @@valid_mjml_binary if @@valid_mjml_binary

  puts Mjml.mjml_binary_error_string
end