import type { GroupAnswers, RecommendationReason, TraitKey } from "./deckTypes";

export type RecommendationWhyCopy = {
  why: {
    fit: string;
    fitWithAnswer: string;
    opened: string;
    added: string;
  };
  group: {
    kindAndSize: string;
    kindOnly: string;
    sizeOnly: string;
    kind: Record<string, string>;
    size: Record<string, string>;
  };
  answerThirdPerson: Record<string, string>;
  answerYouSaid: Record<string, string>;
};

export function formatGroupPhrase(
  answers: GroupAnswers,
  copy: RecommendationWhyCopy,
): string {
  const kind = answers.mainKind ? copy.group.kind[answers.mainKind] : "";
  const size = answers.size ? copy.group.size[answers.size] : "";
  if (kind && size) {
    return copy.group.kindAndSize
      .replace("{kind}", kind)
      .replace("{size}", size);
  }
  if (kind) return copy.group.kindOnly.replace("{kind}", kind);
  if (size) return copy.group.sizeOnly.replace("{size}", size);
  return "";
}

function answerPhrase(
  key: TraitKey,
  phrases: Record<string, string>,
): string {
  return phrases[key] ?? key;
}

/**
 * Why line for a recommended card in the compact seven.
 * Near-universal cards keep their catalog description instead.
 */
export function formatRecommendationWhyLine(
  reason: RecommendationReason,
  answers: GroupAnswers,
  copy: RecommendationWhyCopy,
): string {
  if (reason.kind === "added") {
    return copy.why.added.replace(
      "{answer}",
      answerPhrase(reason.answer, copy.answerYouSaid),
    );
  }
  if (reason.kind === "opened") {
    return copy.why.opened.replace(
      "{answer}",
      answerPhrase(reason.answer, copy.answerYouSaid),
    );
  }
  const group = formatGroupPhrase(answers, copy);
  if (!group) return "";
  if (reason.answer) {
    return copy.why.fitWithAnswer
      .replace("{group}", group)
      .replace("{answer}", answerPhrase(reason.answer, copy.answerThirdPerson));
  }
  return copy.why.fit.replace("{group}", group);
}