class RuboCop::Cop::Style::TernaryParentheses

def autocorrect(corrector, node)
  condition = node.condition
  return nil if parenthesized?(condition) &&
                (safe_assignment?(condition) || unsafe_autocorrect?(condition))
  if parenthesized?(condition)
    correct_parenthesized(corrector, condition)
  else
    correct_unparenthesized(corrector, condition)
  end
end

def below_ternary_precedence?(child)
  # Handle English "or", e.g. 'foo or bar ? a : b'
  (child.or_type? && child.semantic_operator?) ||
    # Handle English "and", e.g. 'foo and bar ? a : b'
    (child.and_type? && child.semantic_operator?) ||
    # Handle English "not", e.g. 'not foo ? a : b'
    (child.send_type? && child.prefix_not?)
end

def complex_condition?(condition)
  if condition.begin_type?
    condition.to_a.any? { |x| complex_condition?(x) }
  else
    !non_complex_expression?(condition)
  end
end

def correct_parenthesized(corrector, condition)
  corrector.remove(condition.loc.begin)
  corrector.remove(condition.loc.end)
  # Ruby allows no space between the question mark and parentheses.
  # If we remove the parentheses, we need to add a space or we'll
  # generate invalid code.
  corrector.insert_after(condition.loc.end, ' ') unless whitespace_after?(condition)
end

def correct_unparenthesized(corrector, condition)
  corrector.wrap(condition, '(', ')')
end

def infinite_loop?
  (require_parentheses? || require_parentheses_when_complex?) &&
    redundant_parentheses_enabled?
end

def message(node)
  if require_parentheses_when_complex?
    command = parenthesized?(node.condition) ? 'Only use' : 'Use'
    format(MSG_COMPLEX, command: command)
  else
    command = require_parentheses? ? 'Use' : 'Omit'
    format(MSG, command: command)
  end
end

def non_complex_expression?(condition)
  NON_COMPLEX_TYPES.include?(condition.type) || non_complex_send?(condition)
end

def non_complex_send?(node)
  return false unless node.call_type?
  !node.operator_method? || node.method?(:[])
end

def offense?(node)
  condition = node.condition
  if safe_assignment?(condition)
    !safe_assignment_allowed?
  else
    parens = parenthesized?(condition)
    case style
    when :require_parentheses_when_complex
      complex_condition?(condition) ? !parens : parens
    else
      require_parentheses? ? !parens : parens
    end
  end
end

def on_if(node)
  return if only_closing_parenthesis_is_last_line?(node.condition)
  return unless node.ternary? && !infinite_loop? && offense?(node)
  message = message(node)
  add_offense(node.source_range, message: message) do |corrector|
    autocorrect(corrector, node)
  end
end

def only_closing_parenthesis_is_last_line?(condition)
  condition.source.split("\n").last == ')'
end

def parenthesized?(node)
  node.begin_type?
end

def redundant_parentheses_enabled?
  @config.for_cop('Style/RedundantParentheses').fetch('Enabled')
end

def require_parentheses?
  style == :require_parentheses
end

def require_parentheses_when_complex?
  style == :require_parentheses_when_complex
end

def unparenthesized_method_call?(child)
  /^[a-z]/i.match?(method_name(child)) && !child.parenthesized?
end

def unsafe_autocorrect?(condition)
  condition.children.any? do |child|
    unparenthesized_method_call?(child) ||
      below_ternary_precedence?(child)
  end
end

def whitespace_after?(node)
  last_token = processed_source.last_token_of(node)
  last_token.space_after?
end