import { test } from 'node:test';
import assert from 'node:assert/strict';
import { FrameSet, type FrameSource, type FrameTarget } from '../../YouleNexus/assets/framework/ui/frame-set.ts';

/**
 * Mock FrameSource：按 prefix 返回 SpriteFrame 数组。
 * SpriteFrame 是 opaque（任何非 null 对象即可，FrameSet 只引用不深查）。
 */
function makeFrames(prefix: string, count: number): any[] {
  return Array.from({ length: count }, (_, i) => ({ __mock: true, name: frameName(prefix, i + 1, count) }));
}
function frameName(prefix: string, i: number, count: number): string {
  return count <= 1 ? `${prefix}.png` : `${prefix}_${String(i).padStart(String(count).length, '0')}.png`;
}

/** Mock 加载器：同步、按 prefix 全量返回该 prefix 的所有帧。 */
function mockSource(frames: Map<string, any[]>): FrameSource {
  return {
    async loadByPrefix(prefix: string) {
      return frames.get(prefix) ?? [];
    },
  };
}

/** Mock 目标：仅记录最后一次 setFrame 调用。 */
function mockTarget(): FrameTarget & { lastFrame: any | null; lastError: Error | null } {
  return { lastFrame: null, lastError: null, setSpriteFrame(f) { this.lastFrame = f; } };
}

test('FrameSet 首次 setFrame 触发按 prefix 加载', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  const source = mockSource(new Map([['atlas-login/00014', frames]]));
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target: mockTarget() });

  const before = (set as any).state;
  assert.equal(before, 'idle');

  await set.setFrame(1);
  assert.equal((set as any).state, 'ready');
});

test('FrameSet setFrame(1) 返回第一帧（与 frameFileName 公式对齐）', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  const source = mockSource(new Map([['atlas-login/00014', frames]]));
  const target = mockTarget();
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target });

  await set.setFrame(1);
  assert.equal(target.lastFrame?.name, 'atlas-login/00014_01.png');
});

test('FrameSet setFrame(10) 返回第 10 帧（旧引擎实证：通知=FrameIndex=10）', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  const source = mockSource(new Map([['atlas-login/00014', frames]]));
  const target = mockTarget();
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target });

  await set.setFrame(10);
  assert.equal(target.lastFrame?.name, 'atlas-login/00014_10.png');
});

test('FrameSet setFrame(0) 按 1 处理（旧引擎 2 个对象 FrameIndex=0）', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  const source = mockSource(new Map([['atlas-login/00014', frames]]));
  const target = mockTarget();
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target });

  await set.setFrame(0);
  assert.equal(target.lastFrame?.name, 'atlas-login/00014_01.png');
});

test('FrameSet 越界帧号显式抛错（第二准则：不兜底）', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  const source = mockSource(new Map([['atlas-login/00014', frames]]));
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target: mockTarget() });
  await set.setFrame(1); // 先把 state 推到 ready

  await assert.rejects(() => set.setFrame(13), (e: Error) => {
    return e.message.includes('atlas-login/00014') && e.message.includes('13');
  });
});

test('FrameSet 源返回空数组显式抛错（prefix 错配要早暴露）', async () => {
  const source = mockSource(new Map()); // 空
  const set = new FrameSet({ prefix: 'atlas-login/wrong', source, target: mockTarget() });
  await assert.rejects(() => set.setFrame(1), (e: Error) => e.message.includes('atlas-login/wrong'));
});

test('FrameSet 不重复 IO：连续 setFrame 只 loadByPrefix 一次', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  let calls = 0;
  const source: FrameSource = {
    async loadByPrefix(prefix: string) {
      calls++;
      return frames;
    },
  };
  const target = mockTarget();
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target });

  await set.setFrame(1);
  await set.setFrame(5);
  await set.setFrame(10);
  assert.equal(calls, 1, '只首次触发加载');
});

test('FrameSet 并发去重：两次 setFrame(1) 同时调用也只 loadByPrefix 一次', async () => {
  const frames = makeFrames('atlas-login/00014', 12);
  let calls = 0;
  const source: FrameSource = {
    async loadByPrefix(prefix: string) {
      calls++;
      // 模拟异步：制造竞态
      await new Promise((r) => setTimeout(r, 5));
      return frames;
    },
  };
  const target = mockTarget();
  const set = new FrameSet({ prefix: 'atlas-login/00014', source, target });

  await Promise.all([set.setFrame(1), set.setFrame(1), set.setFrame(1)]);
  assert.equal(calls, 1);
});

test('FrameSet currentFrame 默认 0（与 B §3 cpid=43 初始一致）', () => {
  const set = new FrameSet({ prefix: 'atlas-login/00014', source: mockSource(new Map()), target: mockTarget() });
  assert.equal(set.currentFrame, 0);
});