export const SOMETHING_ELSE_VALUE = "__something_else__";
export const SOMETHING_ELSE_LABEL = "Something else…";

export function normalizeQuestions(inputQuestions) {
  return inputQuestions.map((question, index) => ({
    ...question,
    label: question.label?.trim() ? question.label : `Q${index + 1}`,
    options: [
      ...question.options,
      {
        value: SOMETHING_ELSE_VALUE,
        label: SOMETHING_ELSE_LABEL,
      },
    ],
  }));
}

export function isSomethingElseOption(option) {
  return option?.value === SOMETHING_ELSE_VALUE;
}

export function createPredefinedAnswer(questionId, option, index) {
  return {
    id: questionId,
    value: option.value,
    label: option.label,
    wasCustom: false,
    index,
  };
}

export function createCustomAnswer(questionId, text) {
  return {
    id: questionId,
    value: text,
    label: text,
    wasCustom: true,
  };
}

export function summarizeAnswers(questions, answers) {
  const answerById = new Map(answers.map((answer) => [answer.id, answer]));
  return questions.flatMap((question) => {
    const answer = answerById.get(question.id);
    if (!answer) return [];
    if (answer.wasCustom) {
      return [`${question.label}: user wrote: ${answer.label}`];
    }
    return [`${question.label}: user selected: ${answer.index}. ${answer.label}`];
  });
}

export function createCancelledResult(questions = []) {
  return {
    questions,
    answers: [],
    cancelled: true,
  };
}

export function createAnsweredResult(questions, answers) {
  const order = new Map(questions.map((question, index) => [question.id, index]));
  return {
    questions,
    answers: [...answers].sort(
      (left, right) => (order.get(left.id) ?? Number.POSITIVE_INFINITY) - (order.get(right.id) ?? Number.POSITIVE_INFINITY),
    ),
    cancelled: false,
  };
}

export function allQuestionsAnswered(questions, answers) {
  return questions.every((question) => answers.has(question.id));
}

export function nextTabAfterAnswer(currentTab, questionCount) {
  return currentTab < questionCount - 1 ? currentTab + 1 : questionCount;
}