import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, mkdirSync, writeFileSync, existsSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { Store } from '../src/store/index.js';
import { buildServer } from '../src/api/server.js';
import type { Attachment } from '../src/model/types.js';

/** 临时数据目录（充当 MAESTRO_DATA_DIR）。 */
function tmpData(): string {
  return mkdtempSync(join(tmpdir(), 'maestro-attach-'));
}

/** 在 store 里建项目 + 任务，返回 {store, taskId}。 */
function freshTask(): { store: Store; taskId: string } {
  const store = new Store(':memory:');
  const p = store.createProject({ name: 'a', repoPath: '/tmp/a-' + Math.random() });
  const t = store.createTask({ projectId: p.id, title: 'demo', complexity: 'easy' });
  return { store, taskId: t.id };
}

/** 把一份附件文件落盘到 <data>/tasks/<id>/attachments/<name>，并返回元数据。 */
function placeFile(dir: string, taskId: string, name: string, mime: string, body: Buffer | string): Attachment {
  const attDir = join(dir, 'tasks', taskId, 'attachments');
  mkdirSync(attDir, { recursive: true });
  writeFileSync(join(attDir, name), body);
  return { name, type: mime, path: `tasks/${taskId}/attachments/${name}` };
}

// ───────────────────────── Store 层 ─────────────────────────

test('addAttachments：按 path 去重（later-wins）', () => {
  const { store, taskId } = freshTask();
  store.addAttachments(taskId, [{ name: 'a.png', type: 'image/png', path: `tasks/${taskId}/attachments/a.png` }]);
  // 重传同一 path（safeName 相同）→ 元数据只保留一条，且取最新 name/type
  const next = store.addAttachments(taskId, [
    { name: 'a-renamed.png', type: 'image/jpeg', path: `tasks/${taskId}/attachments/a.png` },
    { name: 'b.pdf', type: 'application/pdf', path: `tasks/${taskId}/attachments/b.pdf` },
  ]);
  assert.equal(next.length, 2);
  const a = next.find((x) => x.path.endsWith('/a.png'));
  assert.equal(a?.name, 'a-renamed.png');
  assert.equal(a?.type, 'image/jpeg');
  // 插入顺序保持：a 在前、b 在后
  assert.deepEqual(next.map((x) => x.path.split('/').pop()), ['a.png', 'b.pdf']);
  store.close();
});

test('removeAttachment：按磁盘文件名移除，返回 removed；不存在则 removed=null', () => {
  const { store, taskId } = freshTask();
  store.addAttachments(taskId, [
    { name: 'keep.png', type: 'image/png', path: `tasks/${taskId}/attachments/keep.png` },
    { name: 'gone.pdf', type: 'application/pdf', path: `tasks/${taskId}/attachments/gone.pdf` },
  ]);
  const r1 = store.removeAttachment(taskId, 'gone.pdf');
  assert.equal(r1.removed?.path, `tasks/${taskId}/attachments/gone.pdf`);
  assert.deepEqual(r1.attachments.map((x) => x.path.split('/').pop()), ['keep.png']);
  // 再删不存在的名字 → removed=null，列表不变
  const r2 = store.removeAttachment(taskId, 'nope.png');
  assert.equal(r2.removed, null);
  assert.equal(r2.attachments.length, 1);
  store.close();
});

test('removeAttachment / addAttachments：任务不存在抛错', () => {
  const store = new Store(':memory:');
  assert.throws(() => store.removeAttachment('tsk_nope', 'x'));
  assert.throws(() => store.addAttachments('tsk_nope', []));
  store.close();
});

// ───────────────────────── API 层（Fastify inject）─────────────────────────

test('GET 附件：默认 inline，content-type/length 正确', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  const png = Buffer.from('\x89PNG\r\n\x1a\n-fake-image-bytes', 'binary');
  store.addAttachments(taskId, [placeFile(dir, taskId, 'pic.png', 'image/png', png)]);

  const app = buildServer({ store });
  const res = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}/attachments/pic.png` });
  assert.equal(res.statusCode, 200);
  assert.match(res.headers['content-type'] as string, /image\/png/);
  assert.equal(res.headers['content-length'], String(png.length));
  assert.match(res.headers['content-disposition'] as string, /^inline; filename\*=UTF-8''pic\.png/);
  await app.close();
  store.close();
});

test('GET 附件：?download=1 → attachment + RFC5987 文件名（中文不乱码）', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  // 磁盘安全名为 ascii，但原始 name 含中文
  store.addAttachments(taskId, [{
    name: '设计稿.png', type: 'image/png', path: `tasks/${taskId}/attachments/paste-1.png`,
  }]);
  placeFile(dir, taskId, 'paste-1.png', 'image/png', 'data');

  const app = buildServer({ store });
  const res = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}/attachments/paste-1.png?download=1` });
  assert.equal(res.statusCode, 200);
  const cd = res.headers['content-disposition'] as string;
  assert.match(cd, /^attachment; filename\*=UTF-8''/);
  assert.match(cd, new RegExp(encodeURIComponent('设计稿.png')));
  await app.close();
  store.close();
});

test('DELETE 附件：剔除元数据 + 删磁盘文件；之后 GET 404', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  store.addAttachments(taskId, [placeFile(dir, taskId, 'doc.pdf', 'application/pdf', 'pdfdata')]);
  const absFile = join(dir, 'tasks', taskId, 'attachments', 'doc.pdf');
  assert.ok(existsSync(absFile));

  const app = buildServer({ store });
  const del = await app.inject({ method: 'DELETE', url: `/api/tasks/${taskId}/attachments/doc.pdf` });
  assert.equal(del.statusCode, 200);
  assert.deepEqual(del.json().attachments, []);
  assert.ok(!existsSync(absFile), '磁盘文件应被删除');

  const get = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}/attachments/doc.pdf` });
  assert.equal(get.statusCode, 404);
  await app.close();
  store.close();
});

test('GET/DELETE：任务不存在 → 404', async () => {
  const store = new Store(':memory:');
  const app = buildServer({ store });
  const g = await app.inject({ method: 'GET', url: `/api/tasks/tsk_nope/attachments/x.png` });
  assert.equal(g.statusCode, 404);
  const d = await app.inject({ method: 'DELETE', url: `/api/tasks/tsk_nope/attachments/x.png` });
  assert.equal(d.statusCode, 404);
  await app.close();
  store.close();
});

test('GET：未登记的附件名 → 404（不返回目录外/任意文件）', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  placeFile(dir, taskId, 'secret.png', 'image/png', 'x'); // 落盘但不登记元数据
  const app = buildServer({ store });
  const res = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}/attachments/secret.png` });
  assert.equal(res.statusCode, 404);
  await app.close();
  store.close();
});

test('GET：元数据在但磁盘文件丢失 → 404「附件文件已丢失」', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  // 只写元数据，不落盘
  store.addAttachments(taskId, [{ name: 'ghost.png', type: 'image/png', path: `tasks/${taskId}/attachments/ghost.png` }]);
  const app = buildServer({ store });
  const res = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}/attachments/ghost.png` });
  assert.equal(res.statusCode, 404);
  assert.match(res.json().error, /丢失/);
  await app.close();
  store.close();
});

test('DELETE：元数据在但磁盘文件已被外部删除 → 仍成功清元数据', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  store.addAttachments(taskId, [{ name: 'ghost.png', type: 'image/png', path: `tasks/${taskId}/attachments/ghost.png` }]);
  const app = buildServer({ store });
  const res = await app.inject({ method: 'DELETE', url: `/api/tasks/${taskId}/attachments/ghost.png` });
  assert.equal(res.statusCode, 200);
  assert.deepEqual(res.json().attachments, []);
  await app.close();
  store.close();
});

test('上传→去重端到端：同名文件连传两次，元数据只一条', async () => {
  const dir = tmpData();
  process.env.MAESTRO_DATA_DIR = dir;
  const { store, taskId } = freshTask();
  const app = buildServer({ store });

  function multipart(filename: string, content: string): { payload: Buffer; headers: Record<string, string> } {
    const boundary = '----maestrotest';
    const body =
      `--${boundary}\r\n` +
      `Content-Disposition: form-data; name="files"; filename="${filename}"\r\n` +
      `Content-Type: image/png\r\n\r\n` +
      content + `\r\n` +
      `--${boundary}--\r\n`;
    return { payload: Buffer.from(body), headers: { 'content-type': `multipart/form-data; boundary=${boundary}` } };
  }

  const m1 = multipart('shot.png', 'aaa');
  const up1 = await app.inject({ method: 'POST', url: `/api/tasks/${taskId}/attachments`, payload: m1.payload, headers: m1.headers });
  assert.equal(up1.statusCode, 200);
  assert.equal(up1.json().attachments.length, 1);

  const m2 = multipart('shot.png', 'bbb');
  const up2 = await app.inject({ method: 'POST', url: `/api/tasks/${taskId}/attachments`, payload: m2.payload, headers: m2.headers });
  assert.equal(up2.statusCode, 200);
  // 同名 safeName → path 相同 → 去重为一条
  const atts = up2.json().attachments;
  assert.equal(atts.length, 1, '同名重传应去重为一条');

  // 通过 GET /api/tasks/:id 复核
  const t = await app.inject({ method: 'GET', url: `/api/tasks/${taskId}` });
  assert.equal(t.json().attachments.length, 1);
  await app.close();
  store.close();
});