/* eslint-disable max-lines-per-function -- Test suites naturally have many cases */
/* eslint-disable max-lines -- Test suites naturally have many cases */
/* eslint-disable @typescript-eslint/consistent-type-assertions -- Tests build minimal state objects */
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import type { DailyChallengeState, GameState } from "@elysium/types";

// We reset modules so the module picks up fake timers when re-imported
beforeEach(() => {
  vi.resetModules();
  vi.useFakeTimers();
});

afterEach(() => {
  vi.useRealTimers();
});

const makeState = (dailyChallenges?: DailyChallengeState): GameState =>
  ({ dailyChallenges } as unknown as GameState);

const LA_MIDNIGHT_2024_01_15 = new Date("2024-01-15T08:00:00.000Z"); // LA midnight = UTC+8
const LA_MIDNIGHT_2024_01_16 = new Date("2024-01-16T08:00:00.000Z");

describe("generateDailyChallenges", () => {
  it("returns exactly 3 challenges", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { generateDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const result = generateDailyChallenges("2024-01-15");
    expect(result).toHaveLength(3);
  });

  it("all challenges start with progress 0 and completed false", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { generateDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const result = generateDailyChallenges("2024-01-15");
    for (const challenge of result) {
      expect(challenge.progress).toBe(0);
      expect(challenge.completed).toBe(false);
    }
  });

  it("is deterministic for the same date", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { generateDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const a = generateDailyChallenges("2024-01-15");
    const b = generateDailyChallenges("2024-01-15");
    expect(a.map((c) => c.id)).toEqual(b.map((c) => c.id));
  });

  it("generates different challenges for different dates", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { generateDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const day1 = generateDailyChallenges("2024-01-15");
    const day2 = generateDailyChallenges("2024-01-16");
    // They should differ in at least one challenge ID (types vary by seed)
    expect(day1.map((c) => c.type)).not.toEqual(day2.map((c) => c.type));
  });
});

describe("getOrResetDailyChallenges", () => {
  it("returns existing challenges when date matches today", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { getOrResetDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const existing: DailyChallengeState = {
      date: "2024-01-15",
      challenges: [{ id: "old_challenge", type: "clicks", label: "l", target: 100, progress: 50, completed: false, rewardCrystals: 1 }],
    };
    const state = makeState(existing);
    const result = getOrResetDailyChallenges(state);
    expect(result).toBe(existing);
  });

  it("generates fresh challenges when date is yesterday", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_16);
    const { getOrResetDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const stale: DailyChallengeState = {
      date: "2024-01-15",
      challenges: [],
    };
    const state = makeState(stale);
    const result = getOrResetDailyChallenges(state);
    expect(result.date).toBe("2024-01-16");
    expect(result.challenges).toHaveLength(3);
  });

  it("generates fresh challenges when dailyChallenges is undefined", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { getOrResetDailyChallenges } = await import("../../src/services/dailyChallenges.js");
    const state = makeState(undefined);
    const result = getOrResetDailyChallenges(state);
    expect(result.challenges).toHaveLength(3);
    expect(result.date).toBe("2024-01-15");
  });
});

describe("updateChallengeProgress", () => {
  const makeChallenge = (
    type: DailyChallengeState["challenges"][0]["type"],
    progress: number,
    completed: boolean,
  ) => ({
    id: `${type}_test`,
    type,
    label: "Test",
    target: 100,
    progress,
    completed,
    rewardCrystals: 10,
  });

  const makeState2 = (challenges: DailyChallengeState["challenges"]): DailyChallengeState => ({
    date: "2024-01-15",
    challenges,
  });

  it("increments progress for matching non-completed challenges", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("clicks", 0, false)]);
    const { updatedChallenges } = updateChallengeProgress(state, "clicks", 10);
    expect(updatedChallenges.challenges[0]!.progress).toBe(10);
  });

  it("does not modify already-completed challenges", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("clicks", 100, true)]);
    const { updatedChallenges } = updateChallengeProgress(state, "clicks", 50);
    expect(updatedChallenges.challenges[0]!.progress).toBe(100);
  });

  it("does not modify challenges of a different type", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("bossesDefeated", 0, false)]);
    const { updatedChallenges } = updateChallengeProgress(state, "clicks", 10);
    expect(updatedChallenges.challenges[0]!.progress).toBe(0);
  });

  it("awards crystals when challenge completes", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("clicks", 90, false)]);
    const { crystalsAwarded } = updateChallengeProgress(state, "clicks", 20);
    expect(crystalsAwarded).toBe(10);
  });

  it("caps progress at target value", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("clicks", 95, false)]);
    const { updatedChallenges } = updateChallengeProgress(state, "clicks", 100);
    expect(updatedChallenges.challenges[0]!.progress).toBe(100);
  });

  it("returns zero crystals when no challenge completes", async () => {
    vi.setSystemTime(LA_MIDNIGHT_2024_01_15);
    const { updateChallengeProgress } = await import("../../src/services/dailyChallenges.js");
    const state = makeState2([makeChallenge("clicks", 0, false)]);
    const { crystalsAwarded } = updateChallengeProgress(state, "clicks", 10);
    expect(crystalsAwarded).toBe(0);
  });
});