module HealthBit

# File lib/health_bit.rb, line 48
  def add(name, handler = nil, &block)
    raise ArgumentError, <<~MSG if handler && block
      Both <handler> and <block> were passed to the <#{name}> check
    MSG

    raise ArgumentError, <<~MSG unless handler || block
      Nor <handler> or <block> were passed to the <#{name}> check
    MSG

    checks.push(Check.new(name, handler || block))

    self
  end

# File lib/health_bit.rb, line 63
def check
  checks.each do |check|
    (exception = check.call).nil? ? next : (return exception)
  end

  nil
end

# File lib/health_bit.rb, line 39
def checks
  @checks ||= []
end

# File lib/health_bit.rb, line 87
def clone
  Module.new.tap do |dolly|
    dolly.singleton_class.include(HealthBit)
  end
end

# File lib/health_bit.rb, line 43
def configure
  yield(self)
end

# File lib/health_bit.rb, line 31
def fail_code
  @fail_code || DEFAULT_FAIL_CODE
end

# File lib/health_bit.rb, line 35
def headers
  (@headers || DEFAULT_HEADERS).dup
end

# File lib/health_bit.rb, line 71
def rack(this = self)
  @rack ||= begin
    format = this.show_backtrace ? CheckError::FORMAT_FULL : CheckError::FORMAT_SHORT

    Rack::Builder.new do
      run ->(_env) do
        if (error = this.check)
          [this.fail_code, this.headers, [error.to_s(format)]]
        else
          [this.success_code, this.headers, [this.success_text]]
        end
      end
    end
  end
end

# File lib/health_bit.rb, line 27
def success_code
  @success_code || DEFAULT_SUCCESS_CODE
end

# File lib/health_bit.rb, line 23
def success_text
  format(@success_text || DEFAULT_SUCCESS_TEXT, count: checks.length)
end