import { beforeEach, describe, expect, it } from "vitest";
import { Timestamp } from "firebase-admin/firestore";
import { firestore } from "../../src/firebase";
import {
  judgeDay,
} from "../../src/services/judgmentService";
import { setDay } from "../../src/repositories/voteHistoryRepository";
import type { DateString } from "../../src/types/dateString";
import type {
  DailyJudgment,
  Game,
  GameStatus,
  User,
  VoteHistoryDoc,
} from "../../src/types/panit";

const uid = "judge-uid";

/** 2026-04-14는 화요일 (KST) */
const TUE: DateString = "2026-04-14" as DateString;
const WED: DateString = "2026-04-15" as DateString;
const THU: DateString = "2026-04-16" as DateString;
const FRI: DateString = "2026-04-17" as DateString;
const SAT: DateString = "2026-04-18" as DateString;
const SUN: DateString = "2026-04-19" as DateString;

function makeGame(
  date: DateString,
  status: GameStatus,
  homeTeamCode: string,
  winner: string | null = null
): Game {
  const [y, m, d] = date.split("-").map(Number);
  const doc: Game = {
    time: Timestamp.fromDate(new Date(Date.UTC(y, m - 1, d, 9, 0))),
    stadium: "잠실",
    status,
    homeTeamCode,
    awayTeamCode: "HT",
  };
  if (winner) doc.winningTeamCode = winner;
  return doc;
}

async function seedGames(
  date: DateString,
  specs: Array<{ status: GameStatus; winner?: string }>
): Promise<void> {
  for (let i = 0; i < specs.length; i++) {
    const spec = specs[i];
    const gameId = `${date.replace(/-/g, "")}G${i}`;
    const game = makeGame(date, spec.status, "LG", spec.winner ?? null);
    await firestore.collection("games").doc(gameId).set(game);
  }
}

function voteDocOf(correct: number, total: number): VoteHistoryDoc {
  const data = [];
  for (let i = 0; i < total; i++) {
    data.push({
      gameId: `g${i}`,
      team: "LG",
      result: i < correct,
    });
  }
  return { data };
}

async function seedUser(patch: Partial<User> = {}): Promise<void> {
  await firestore
    .collection("users")
    .doc(uid)
    .set(
      {
        displayName: "judge",
        email: "j@e.com",
        provider: "google",
        knowledgeLevel: "beginner",
        createdAt: Timestamp.now(),
        ...patch,
      },
      { merge: true }
    );
}

async function readUser(): Promise<Partial<User>> {
  const snap = await firestore.collection("users").doc(uid).get();
  return (snap.data() ?? {}) as Partial<User>;
}

async function readVoteHistory(date: DateString): Promise<VoteHistoryDoc> {
  const snap = await firestore
    .collection("users")
    .doc(uid)
    .collection("voteHistory")
    .doc(date)
    .get();
  return (snap.data() ?? { data: [] }) as VoteHistoryDoc;
}

async function seedJudgedHistory(
  date: DateString,
  judgment: DailyJudgment
): Promise<void> {
  await setDay(uid, date, { data: [], judgment });
}

describe("judgmentService (Firestore emulator)", () => {
  beforeEach(async () => {
    await firestore.recursiveDelete(firestore.collection("users"));
    await firestore.recursiveDelete(firestore.collection("games"));
    await seedUser();
  });

  describe("judgeDay — 정상 5경기", () => {
    it("5경기 모두 종료·5적중이면 perfect 판정과 dailyAllKill 티켓 지급", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      const vote = voteDocOf(5, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      const hist = await readVoteHistory(TUE);

      expect(hist.judgment).toBe("perfect");
      expect(hist.correctCount).toBe(5);
      expect(hist.completedCount).toBe(5);
      expect(hist.streakAfter).toBe(1);
      expect(user.currentStreak).toBe(1);
      expect(user.highestStreak).toBe(1);
      expect(user.tierPoints).toBe(50); // 5 * 10, streak 1이라 보너스 0
      expect(user.lastJudgedDate).toBe(TUE);
    });

    it("5경기·3적중은 success, 스트릭 +1, 티켓 미지급", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      const vote = voteDocOf(3, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      const hist = await readVoteHistory(TUE);

      expect(hist.judgment).toBe("success");
      expect(user.currentStreak).toBe(1);
      expect(user.tierPoints).toBe(30);
    });

    it("5경기·2적중은 fail, 스트릭 0 유지, 포인트 불변", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      await seedUser({ currentStreak: 3, highestStreak: 3, tierPoints: 100 });
      const vote = voteDocOf(2, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(0);
      expect(user.highestStreak).toBe(3); // 기존 최고치 유지
      expect(user.tierPoints).toBe(100); // 감점 없음
    });
  });

  describe("judgeDay — 일부 취소 (thresholds 일반화)", () => {
    it("3 completed + 2 cancelled, 2적중이면 success (success=2, perfect=3)", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "cancelled" },
        { status: "cancelled" },
      ]);
      const vote = voteDocOf(2, 3);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const hist = await readVoteHistory(TUE);
      expect(hist.judgment).toBe("success");
      expect(hist.completedCount).toBe(3);
    });

    it("3 completed, 3적중이면 perfect → dailyAllKill 지급", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      const vote = voteDocOf(3, 3);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      const hist = await readVoteHistory(TUE);
      expect(hist.judgment).toBe("perfect");
    });

    it("4 completed, 2적중이면 success (success=2, perfect=4)", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      const vote = voteDocOf(2, 4);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const hist = await readVoteHistory(TUE);
      expect(hist.judgment).toBe("success");
    });
  });

  describe("judgeDay — skip (completed ≤ 2)", () => {
    it("2 completed만 있으면 skip, 스트릭 유지, 포인트 불변", async () => {
      await seedUser({ currentStreak: 4, tierPoints: 80, highestStreak: 4 });
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "cancelled" },
      ]);
      const vote = voteDocOf(1, 2);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      const hist = await readVoteHistory(TUE);

      expect(hist.judgment).toBe("skip");
      expect(hist.streakAfter).toBe(4);
      expect(user.currentStreak).toBe(4);
      expect(user.tierPoints).toBe(80);
    });
  });

  describe("judgeDay — 결석 후 복귀 시 streak 리셋", () => {
    const SAT: DateString = "2026-04-11" as DateString; // TUE - 3일
    const SUN_PREV: DateString = "2026-04-12" as DateString; // TUE - 2일
    const MON_PREV: DateString = "2026-04-13" as DateString; // TUE - 1일 (KBO 휴장일)

    function fiveCompleted(): Array<{ status: GameStatus; winner: string }> {
      return Array.from({ length: 5 }, () => ({
        status: "completed" as GameStatus,
        winner: "LG",
      }));
    }

    it("결석 사이에 실제 경기일이 있으면 success여도 streak이 1에서 시작", async () => {
      await seedUser({
        currentStreak: 5,
        highestStreak: 5,
        lastJudgedDate: SAT,
      });
      // (SAT, TUE) 사이에 SUN(경기 5건), MON(휴장) — SUN은 진짜 경기일.
      await seedGames(SUN_PREV, fiveCompleted());
      await seedGames(TUE, fiveCompleted());
      const vote = voteDocOf(3, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      const hist = await readVoteHistory(TUE);
      expect(hist.streakAfter).toBe(1);
      expect(user.currentStreak).toBe(1);
      expect(user.highestStreak).toBe(5);
    });

    it("결석 후 복귀일이 fail이어도 streak은 0", async () => {
      await seedUser({
        currentStreak: 5,
        highestStreak: 5,
        lastJudgedDate: SAT,
      });
      await seedGames(SUN_PREV, fiveCompleted());
      await seedGames(TUE, fiveCompleted());
      const vote = voteDocOf(2, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(0);
    });

    it("lastJudgedDate가 직전날이면 success가 누적되어 +1 (회귀 확인)", async () => {
      await seedUser({
        currentStreak: 5,
        highestStreak: 5,
        lastJudgedDate: MON_PREV,
      });
      await seedGames(TUE, fiveCompleted());
      const vote = voteDocOf(3, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(6);
      expect(user.highestStreak).toBe(6);
    });

    it("gap 안에 휴장일(KBO 월요일)만 있으면 streak 유지하고 누적", async () => {
      // lastJudged = SUN, date = TUE, 그 사이는 MON 하나뿐인데 MON은 경기 0건 → skip 처리.
      await seedUser({
        currentStreak: 5,
        highestStreak: 5,
        lastJudgedDate: SUN_PREV,
      });
      // MON은 경기를 시드하지 않음(휴장일) — listByDate가 빈 배열 반환.
      await seedGames(TUE, fiveCompleted());
      const vote = voteDocOf(3, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(6);
      expect(user.highestStreak).toBe(6);
    });

    it("gap의 경기들이 모두 ≤2 completed(skip 조건)이면 streak 유지", async () => {
      // (SAT, TUE) 사이의 SUN은 cancelled 다수 + 2 completed → thresholdsFor=skip.
      await seedUser({
        currentStreak: 5,
        highestStreak: 5,
        lastJudgedDate: SAT,
      });
      await seedGames(SUN_PREV, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "cancelled" },
      ]);
      await seedGames(TUE, fiveCompleted());
      const vote = voteDocOf(3, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(6);
    });
  });

  describe("judgeDay — 멱등성", () => {
    it("같은 날짜에 두 번 호출해도 포인트·스트릭·티켓이 두 번 누적되지 않는다", async () => {
      await seedGames(TUE, [
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
        { status: "completed", winner: "LG" },
      ]);
      const vote = voteDocOf(5, 5);
      await setDay(uid, TUE, vote);

      await judgeDay(uid, TUE, vote);
      await judgeDay(uid, TUE, vote);

      const user = await readUser();
      expect(user.currentStreak).toBe(1);
      expect(user.tierPoints).toBe(50);
    });
  });

});