import { describe, expect, it } from "vitest";
import {
  createQuestions,
  gameReducer,
  initialGame,
  isCorrect,
  normalizeAnswer,
  summarize,
} from "../src/game";

// 고정 seed로 재현 가능성을 확보하되 seed를 바꾸면 10문제를 넘는 조합이
// 실제로 선택되는지 본다. 오디오 URL도 같은 문장 조합을 가리켜야 한다.
describe("출제와 정답 판정", () => {
  it("실제 보기에 있는 경쟁 단어를 문장에 넣고 청취 연산별 순서를 유지한다", () => {
    for (let seed = 0; seed < 20; seed++) {
      for (const q of createQuestions(seed, "choice")) {
        expect(q.sentence).not.toMatch(/[{}]/);
        expect(q.sentence).toContain(`‘${q.word.answer}’`);
        if (q.pattern.id !== "luck") {
          expect(q.sentence).toContain(`‘${q.word.distractors[0]!.word}’`);
        }
        const expected = q.pattern.sentence
          .replaceAll("{word}", q.word.answer)
          .replaceAll("{distractor1}", q.word.distractors[0]!.word)
          .replaceAll("{distractor2}", q.word.distractors[1]!.word);
        expect(q.sentence).toBe(expected);
      }
    }
  });
  it("열 문제에 모든 유형·다섯 난이도·두 응답 방식을 섞는다", () => {
    const questions = createQuestions(42, "mixed");
    expect(questions).toHaveLength(10);
    expect(new Set(questions.map((q) => q.pattern.id)).size).toBe(10);
    expect(new Set(questions.map((q) => q.environment.id)).size).toBe(8);
    expect(questions.map((q) => q.level)).toEqual([
      1, 1, 2, 2, 3, 3, 4, 4, 5, 5,
    ]);
    expect(new Set(questions.map((q) => q.mode))).toEqual(
      new Set(["choice", "text"]),
    );
    questions.forEach((q) => {
      expect(q.options).toHaveLength(4);
      expect(new Set(q.options).size).toBe(4);
      expect(q.options.filter((o) => o === q.word.answer)).toHaveLength(1);
      expect(q.sentence).not.toContain("{word}");
      expect(q.audioUrl).toBe(`/audio/${q.pattern.id}-${q.word.id}.wav`);
    });
    expect(createQuestions(42, "mixed")).toEqual(questions);
    expect(
      new Set([...questions, ...createQuestions(91, "mixed")].map((q) => q.id))
        .size,
    ).toBeGreaterThan(10);
    expect(
      new Set(questions.map((q) => q.options.indexOf(q.word.answer))).size,
    ).toBeGreaterThan(1);
  });
  it("선택한 응답 방식과 환경을 모든 문제에 적용한다", () => {
    expect(
      createQuestions(3, "text", "cafe").every(
        (q) => q.mode === "text" && q.environment.id === "cafe",
      ),
    ).toBe(true);
    expect(createQuestions(3, "choice").every((q) => q.mode === "choice")).toBe(
      true,
    );
  });
  it("한글 정규형·공백·문장부호만 정리하고 부분 정답은 인정하지 않는다", () => {
    expect(normalizeAnswer("  “사 과.”  ")).toBe("사과");
    expect(isCorrect("사과".normalize("NFD"), "사과")).toBe(true);
    expect(isCorrect("사과 또는 바다", "사과")).toBe(false);
    expect(isCorrect("", "사과")).toBe(false);
    expect(isCorrect("사고", "사과")).toBe(false);
  });
});

describe("게임 상태·점수·경합 방지", () => {
  it("재생 완료 이전에는 답변·다음 문제를 허용하지 않으며 중복 채점을 막는다", () => {
    let state = initialGame(createQuestions(42, "choice"));
    expect(
      gameReducer(state, {
        type: "ANSWER",
        input: state.questions[0]!.word.answer,
      }),
    ).toBe(state);
    state = gameReducer(state, { type: "PLAY" });
    expect(state.phase).toBe("loading");
    expect(gameReducer(state, { type: "PLAY" })).toBe(state);
    expect(gameReducer(state, { type: "NEXT" })).toBe(state);
    state = gameReducer(state, { type: "STARTED" });
    expect(state.phase).toBe("playing");
    state = gameReducer(state, { type: "ENDED" });
    expect(state.phase).toBe("answer");
    state = gameReducer(state, {
      type: "ANSWER",
      input: state.questions[0]!.word.answer,
    });
    expect(state.phase).toBe("feedback");
    expect(gameReducer(state, { type: "ANSWER", input: "오답" })).toBe(state);
    expect(state.answers[0]!.points).toBe(100);
  });
  it("오디오 오류 후 재시도와 다시 듣기는 점수를 변경하지 않는다", () => {
    let state = initialGame(createQuestions(4, "mixed"));
    state = gameReducer(state, { type: "PLAY" });
    state = gameReducer(state, {
      type: "ERROR",
      message: "음성 파일을 읽지 못했습니다.",
    });
    expect(state.phase).toBe("ready");
    expect(state.error).toContain("음성");
    state = gameReducer(state, { type: "PLAY" });
    expect(state.error).toBeNull();
    state = gameReducer(gameReducer(state, { type: "STARTED" }), {
      type: "ENDED",
    });
    state = gameReducer(state, { type: "PLAY" });
    expect(state.phase).toBe("loading");
    expect(state.answers).toHaveLength(0);
  });
  it("열 문제를 끝내면 정답률·연속 정답·단계별 결과를 집계한다", () => {
    let state = initialGame(createQuestions(5, "choice"));
    expect(summarize(state).accuracy).toBe(0);
    for (let i = 0; i < 10; i++) {
      state = gameReducer(state, { type: "PLAY" });
      state = gameReducer(state, { type: "STARTED" });
      state = gameReducer(state, { type: "ENDED" });
      state = gameReducer(state, {
        type: "ANSWER",
        input: i === 2 ? "오답" : state.questions[i]!.word.answer,
      });
      state = gameReducer(state, { type: "NEXT" });
    }
    expect(state.phase).toBe("results");
    expect(state.bestStreak).toBe(7);
    expect(state.streak).toBe(7);
    const result = summarize(state);
    expect(result.accuracy).toBe(90);
    expect(result.correct).toBe(9);
    expect(result.score).toBe(2990);
    expect(result.byLevel).toEqual(
      [1, 2, 3, 4, 5].map((level) => ({
        level,
        total: 2,
        correct: level === 2 ? 1 : 2,
      })),
    );
    expect(gameReducer(state, { type: "PLAY" })).toBe(state);
  });
});