import { test } from 'node:test';
import assert from 'node:assert/strict';
import { execFileSync } from 'node:child_process';
import { mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { Store } from '../src/store/index.js';
import { acceptAndMerge } from '../src/executor/exec-merge.js';
import type { Task } from '../src/model/types.js';

const noopLog = { info() {}, error() {} };

function git(cwd: string, args: string[]): string {
  return execFileSync('git', args, { cwd, encoding: 'utf8' });
}

/** 独立 dataDir + 真实 git repo（main 含 1 commit），t.after 收尾。 */
function setup(t: { after: (fn: () => void) => void }): string {
  const dataDir = mkdtempSync(join(tmpdir(), 'maestro-em-data-'));
  const prev = process.env.MAESTRO_DATA_DIR;
  process.env.MAESTRO_DATA_DIR = dataDir;
  const repo = mkdtempSync(join(tmpdir(), 'maestro-em-repo-'));
  git(repo, ['init', '-b', 'main']);
  git(repo, ['config', 'user.name', 'em']); git(repo, ['config', 'user.email', 'em@t']);
  writeFileSync(join(repo, 'README.md'), '# demo\n');
  git(repo, ['add', '-A']); git(repo, ['commit', '-qm', 'init']);
  t.after(() => {
    if (prev === undefined) delete process.env.MAESTRO_DATA_DIR; else process.env.MAESTRO_DATA_DIR = prev;
    rmSync(dataDir, { recursive: true, force: true });
    rmSync(repo, { recursive: true, force: true });
  });
  return repo;
}

/** 在 store 里把任务推到 exec_review 且带 result（双 verdict=approve）。 */
function taskAtExecReview(s: Store, projectId: string, branch: string): Task {
  const t = s.createTask({ projectId, title: 'feat', complexity: 'easy' });
  s.setOperations(t.id, 'do');
  s.transition(t.id, 'queued');
  s.transition(t.id, 'executing');
  s.setResult(t.id, {
    branch, worktree: null, diffSummary: '', commits: [], prUrl: null,
    summary: 'ok', verdict: 'approve', securitySummary: 'ok', securityVerdict: 'approve', mergeTaskId: null,
  });
  s.transition(t.id, 'exec_review');
  return s.getTask(t.id)!;
}

test('acceptAndMerge：可合并 → 任务 done + result.prUrl=merged:<commit>', async (t) => {
  const repo = setup(t);
  const s = new Store(':memory:');
  const p = s.createProject({ name: 'em', repoPath: repo });
  const branch = 'maestro/tsk_ok';
  git(repo, ['checkout', '-q', '-b', branch]);
  writeFileSync(join(repo, 'feat.txt'), 'F\n');
  git(repo, ['add', '-A']); git(repo, ['commit', '-qm', 'maestro(tsk_ok): feat']);
  git(repo, ['switch', '-q', '--detach']);   // 释放 main，让合并走临时 worktree

  const task = taskAtExecReview(s, p.id, branch);
  const outcome = await acceptAndMerge(s, noopLog, task, 'test');
  assert.equal(outcome.ok, true, outcome.error);
  assert.ok(outcome.mergeCommit);
  const after = s.getTask(task.id)!;
  assert.equal(after.status, 'done', '合并成功 → done');
  assert.match(after.result!.prUrl!, /^merged:/);
  s.close();
});

test('acceptAndMerge：冲突 → ok:false + 建补救任务 + 原任务留 exec_review', async (t) => {
  const repo = setup(t);
  const s = new Store(':memory:');
  const p = s.createProject({ name: 'em', repoPath: repo });
  // main 与 branch 改同一文件同一行 → 冲突
  writeFileSync(join(repo, 'shared.txt'), 'base\n');
  git(repo, ['add', '-A']); git(repo, ['commit', '-qm', 'base shared']);
  const branch = 'maestro/tsk_conf';
  git(repo, ['checkout', '-q', '-b', branch]);
  writeFileSync(join(repo, 'shared.txt'), 'BRANCH\n');
  git(repo, ['add', '-A']); git(repo, ['commit', '-qm', 'maestro(tsk_conf): branch side']);
  git(repo, ['checkout', '-q', 'main']);
  writeFileSync(join(repo, 'shared.txt'), 'MAIN\n');
  git(repo, ['add', '-A']); git(repo, ['commit', '-qm', 'main side']);
  git(repo, ['switch', '-q', '--detach']);

  const task = taskAtExecReview(s, p.id, branch);
  const outcome = await acceptAndMerge(s, noopLog, task, 'test');
  assert.equal(outcome.ok, false, '冲突应失败');
  assert.ok(outcome.remediationTaskId, '应建补救任务');
  assert.equal(s.getTask(task.id)!.status, 'exec_review', '原任务留审核闸（不 decide）');
  s.close();
});