import { test } from 'node:test';
import assert from 'node:assert/strict';
import { buildClassifyPrompt, parseClassification, type ClassifierFn } from '../src/executor/classify.js';
import { Store } from '../src/store/index.js';
import { buildServer } from '../src/api/server.js';
import type { Event } from '../src/model/types.js';

function freshStore(): Store {
  return new Store(':memory:');
}

// ---------- parseClassification（映射 + 兜底） ----------

test('parseClassification：三档正常映射 + 取理由', () => {
  for (const c of ['hard', 'medium', 'easy'] as const) {
    const r = parseClassification(`COMPLEXITY: ${c}\nREASON: 因为如此`);
    assert.equal(r.complexity, c);
    assert.equal(r.reason, '因为如此');
  }
});

test('parseClassification：大小写/空白宽容', () => {
  const r = parseClassification('  complexity:   HARD \nreason:  跨模块  ');
  assert.equal(r.complexity, 'hard');
  assert.equal(r.reason, '跨模块');
});

test('parseClassification：多个 COMPLEXITY 取最后一个', () => {
  const r = parseClassification('COMPLEXITY: easy\n改判\nCOMPLEXITY: hard\nREASON: 复查后升级');
  assert.equal(r.complexity, 'hard');
});

test('parseClassification：噪声/非法 → 兜底 medium', () => {
  for (const noise of ['', '我也不知道', 'COMPLEXITY: trivial\nREASON: 乱写', '随便聊聊']) {
    const r = parseClassification(noise);
    assert.equal(r.complexity, 'medium', `输入「${noise}」应兜底 medium`);
    assert.ok(r.reason.length > 0);
  }
});

test('parseClassification：有档无理由 → 给占位理由', () => {
  const r = parseClassification('COMPLEXITY: easy');
  assert.equal(r.complexity, 'easy');
  assert.ok(r.reason.includes('未给出'));
});

// ---------- buildClassifyPrompt ----------

test('buildClassifyPrompt：含三档判据 + 标题/说明 + 输出格式', () => {
  const p = buildClassifyPrompt('改个文案', '把按钮文字改一下');
  assert.match(p, /easy/);
  assert.match(p, /medium/);
  assert.match(p, /hard/);
  assert.match(p, /改个文案/);
  assert.match(p, /把按钮文字改一下/);
  assert.match(p, /COMPLEXITY:/);
  assert.match(p, /REASON:/);
});

test('buildClassifyPrompt：无说明时占位', () => {
  const p = buildClassifyPrompt('只有标题');
  assert.match(p, /说明：（无）/);
});

// ---------- Store.applyAutoComplexity（回填） ----------

test('applyAutoComplexity：medium 占位 → 回填 hard，状态重置 analyzing + 理由入 plan', () => {
  const s = freshStore();
  const events: Event[] = [];
  s.subscribe((e) => events.push(e));
  const p = s.createProject({ name: 'a', repoPath: '/tmp/a-' + Math.random() });
  const t = s.createTask({ projectId: p.id, title: 'x', complexity: 'medium' }); // speccing
  assert.equal(t.status, 'speccing');

  const u = s.applyAutoComplexity(t.id, 'hard', '需要跨模块拆解');
  assert.equal(u.complexity, 'hard');
  assert.equal(u.status, 'analyzing');
  assert.match(u.plan ?? '', /需要跨模块拆解/);
  // 广播了带理由的 task.updated + status.changed
  const upd = events.filter((e) => e.type === 'task.updated' && e.payload.auto === 'classify').at(-1);
  assert.equal(upd?.payload.complexity, 'hard');
  assert.equal(upd?.payload.reason, '需要跨模块拆解');
  assert.ok(events.some((e) => e.type === 'status.changed' && e.payload.to === 'analyzing'));
  s.close();
});

test('applyAutoComplexity：回填 easy → 状态重置 ready + 理由入 operations', () => {
  const s = freshStore();
  const p = s.createProject({ name: 'b', repoPath: '/tmp/b-' + Math.random() });
  const t = s.createTask({ projectId: p.id, title: 'y', complexity: 'medium' });
  const u = s.applyAutoComplexity(t.id, 'easy', '单文件机械改动');
  assert.equal(u.complexity, 'easy');
  assert.equal(u.status, 'ready');
  assert.match(u.operations ?? '', /单文件机械改动/);
  s.close();
});

test('applyAutoComplexity：判定仍是 medium → 不变状态但记录理由 + 广播', () => {
  const s = freshStore();
  const events: Event[] = [];
  s.subscribe((e) => events.push(e));
  const p = s.createProject({ name: 'c', repoPath: '/tmp/c-' + Math.random() });
  const t = s.createTask({ projectId: p.id, title: 'z', complexity: 'medium' });
  const u = s.applyAutoComplexity(t.id, 'medium', '范围清晰、跨几处');
  assert.equal(u.complexity, 'medium');
  assert.equal(u.status, 'speccing');           // 未变
  assert.match(u.spec ?? '', /范围清晰/);
  assert.ok(events.some((e) => e.type === 'task.updated' && e.payload.auto === 'classify'));
  // medium===medium，不应产生 status.changed
  assert.ok(!events.some((e) => e.type === 'status.changed'));
  s.close();
});

// ---------- 建任务集成（complexity='auto'） ----------

/** 等待一次满足条件的事件（带超时，避免测试挂死） */
function waitFor(store: Store, pred: (e: Event) => boolean, ms = 2000): Promise<Event> {
  return new Promise((resolve, reject) => {
    const timer = setTimeout(() => { off(); reject(new Error('等待事件超时')); }, ms);
    const off = store.subscribe((e) => {
      if (pred(e)) { clearTimeout(timer); off(); resolve(e); }
    });
  });
}

test('POST tasks complexity=auto：先 medium 落库，模型判定后异步回填 hard', async () => {
  const s = freshStore();
  const p = s.createProject({ name: 'srv', repoPath: '/tmp/srv-' + Math.random() });
  const classify: ClassifierFn = async (title) => {
    assert.equal(title, '拆个大功能');
    return { complexity: 'hard', reason: '跨子系统、有未知项' };
  };
  const app = buildServer({ store: s, classify });

  const backfilled = waitFor(s, (e) => e.type === 'task.updated' && e.payload.auto === 'classify');
  const res = await app.inject({
    method: 'POST', url: `/api/projects/${p.id}/tasks`,
    payload: { title: '拆个大功能', complexity: 'auto' },
  });
  assert.equal(res.statusCode, 200);
  const created = res.json();
  assert.equal(created.complexity, 'medium');   // 占位
  assert.equal(created.status, 'speccing');

  await backfilled;
  const after = s.getTask(created.id);
  assert.equal(after?.complexity, 'hard');       // 已回填
  assert.equal(after?.status, 'analyzing');
  assert.match(after?.plan ?? '', /跨子系统/);
  await app.close();
  s.close();
});

test('POST tasks complexity=auto：模型不可用（兜底 medium）仍建成功且为 medium', async () => {
  const s = freshStore();
  const p = s.createProject({ name: 'srv2', repoPath: '/tmp/srv2-' + Math.random() });
  // 模拟 classifyComplexity 内部兜底：返回 medium
  const classify: ClassifierFn = async () => ({ complexity: 'medium', reason: '模型不可用，兜底 medium' });
  const app = buildServer({ store: s, classify });

  const backfilled = waitFor(s, (e) => e.type === 'task.updated' && e.payload.auto === 'classify');
  const res = await app.inject({
    method: 'POST', url: `/api/projects/${p.id}/tasks`,
    payload: { title: '不确定的任务', complexity: 'auto' },
  });
  assert.equal(res.statusCode, 200);
  assert.equal(res.json().complexity, 'medium');

  await backfilled;
  const after = s.getTask(res.json().id);
  assert.equal(after?.complexity, 'medium');
  assert.match(after?.spec ?? '', /兜底 medium/);
  await app.close();
  s.close();
});

test('POST tasks：非法 complexity（非 auto/三档）被拒 400', async () => {
  const s = freshStore();
  const p = s.createProject({ name: 'srv3', repoPath: '/tmp/srv3-' + Math.random() });
  const app = buildServer({ store: s, classify: async () => ({ complexity: 'medium', reason: '' }) });
  const res = await app.inject({
    method: 'POST', url: `/api/projects/${p.id}/tasks`,
    payload: { title: 't', complexity: 'trivial' },
  });
  assert.equal(res.statusCode, 400);
  await app.close();
  s.close();
});