import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { execFileSync } from 'node:child_process';
import { parseChecks, runChecks, diffSizeGate } from '../src/executor/checks.js';
import type { Project } from '../src/model/types.js';

function withTmpData(cb: (dir: string) => Promise<void> | void): Promise<void> | void {
  const dir = mkdtempSync(join(tmpdir(), 'maestro-checks-'));
  const prev = process.env.MAESTRO_DATA_DIR;
  process.env.MAESTRO_DATA_DIR = dir;
  const done = () => {
    if (prev === undefined) delete process.env.MAESTRO_DATA_DIR;
    else process.env.MAESTRO_DATA_DIR = prev;
    rmSync(dir, { recursive: true, force: true });
  };
  try {
    const r = cb(dir);
    if (r instanceof Promise) return r.finally(done);
    done();
  } catch (e) { done(); throw e; }
}

function proj(checks: string | null): Project {
  return { checks, repoPath: '/tmp/x', defaultBranch: 'main' } as Project;
}

test('parseChecks：合法 JSON 取 lint/typecheck/build，非法/空 → {}', () => {
  assert.deepEqual(parseChecks('{"lint":"npm run lint","build":"npm run build"}'), { lint: 'npm run lint', build: 'npm run build' });
  assert.deepEqual(parseChecks('{"other":"x","typecheck":"  tsc  "}'), { typecheck: 'tsc' });
  assert.deepEqual(parseChecks(null), {});
  assert.deepEqual(parseChecks('not json'), {});
  assert.deepEqual(parseChecks('{"lint":""}'), {});  // 空命令跳过
});

test('runChecks：无 checks → 通过', async () => {
  await withTmpData(async (dir) => {
    const r = await runChecks(proj(null), dir, 'run_a');
    assert.equal(r.ok, true);
    assert.equal(r.logRef, null);
  });
});

test('runChecks：各项 exit0 → 通过；任一非0 → 失败并报哪项挂', async () => {
  await withTmpData(async (dir) => {
    const pass = await runChecks(proj('{"lint":"true","typecheck":"true"}'), dir, 'run_b');
    assert.equal(pass.ok, true);
    assert.equal(pass.failed, null);

    const fail = await runChecks(proj('{"lint":"true","typecheck":"false","build":"true"}'), dir, 'run_c');
    assert.equal(fail.ok, false);
    assert.equal(fail.failed, 'typecheck');
    assert.match(fail.error!, /typecheck 检查失败/);
  });
});

test('diffSizeGate：超文件/行阈值 → 拦截；阈值内 → 通过', async () => {
  const repo = mkdtempSync(join(tmpdir(), 'maestro-gitdiff-'));
  const g = (args: string[]) => execFileSync('git', args, { cwd: repo }).toString();
  g(['init', '-q', '-b', 'main']);
  g(['config', 'user.email', 't@t']); g(['config', 'user.name', 't']);
  writeFileSync(join(repo, 'base.txt'), 'base\n');
  g(['add', '-A']); g(['commit', '-qm', 'base']);
  g(['checkout', '-q', '-b', 'feature']);
  // 改动：3 个文件、若干行
  for (const f of ['a.txt', 'b.txt', 'c.txt']) writeFileSync(join(repo, f), 'x\ny\nz\n');
  g(['add', '-A']); g(['commit', '-qm', 'feat']);

  const prevF = process.env.MAESTRO_DIFF_MAX_FILES;
  const prevL = process.env.MAESTRO_DIFF_MAX_LINES;
  try {
    process.env.MAESTRO_DIFF_MAX_FILES = '2';   // 3 文件 > 2 → 拦截
    process.env.MAESTRO_DIFF_MAX_LINES = '0';
    const over = await diffSizeGate(repo, repo, 'feature', 'main');
    assert.equal(over.ok, false);
    assert.equal(over.files, 3);
    assert.match(over.error!, /文件数 3 > 2/);

    process.env.MAESTRO_DIFF_MAX_FILES = '0';   // 0=不限
    process.env.MAESTRO_DIFF_MAX_LINES = '0';
    const under = await diffSizeGate(repo, repo, 'feature', 'main');
    assert.equal(under.ok, true);
    assert.equal(under.files, 3);
  } finally {
    if (prevF === undefined) delete process.env.MAESTRO_DIFF_MAX_FILES; else process.env.MAESTRO_DIFF_MAX_FILES = prevF;
    if (prevL === undefined) delete process.env.MAESTRO_DIFF_MAX_LINES; else process.env.MAESTRO_DIFF_MAX_LINES = prevL;
    rmSync(repo, { recursive: true, force: true });
  }
});

test('diffSizeGate：git 出错 → 不拦截（测不出体量）', async () => {
  const r = await diffSizeGate('/nonexistent-repo-xyz', '/tmp', 'a', 'b');
  assert.equal(r.ok, true);
});