import { test, expect } from '@playwright/test';
import { _electron as electron } from 'playwright';
import { promises as fs } from 'node:fs';
import nodePath from 'node:path';
import os from 'node:os';
import zlib from 'node:zlib';

const MAIN_JS = nodePath.join(process.cwd(), 'dist-electron/main/index.js');

// 生成 1x1 RGB PNG（避免依赖图像库）
function crc32(buf: Buffer): number {
  let c = ~0;
  for (let i = 0; i < buf.length; i++) { c ^= buf[i]; for (let j = 0; j < 8; j++) c = (c >>> 1) ^ (0xedb88320 & -(c & 1)); }
  return ~c >>> 0;
}
function makePng(r: number, g: number, b: number): Buffer {
  const sig = Buffer.from([0x89,0x50,0x4e,0x47,0x0d,0x0a,0x1a,0x0a]);
  const ihdr = Buffer.from([0,0,0,1, 0,0,0,1, 8, 2, 0, 0, 0]); // 1x1, 8bit, RGB
  const idatRaw = Buffer.from([0, r, g, b]);
  const idat = zlib.deflateSync(idatRaw);
  const chunk = (type: string, data: Buffer) => {
    const t = Buffer.from(type, 'ascii'); const len = Buffer.alloc(4); len.writeUInt32BE(data.length, 0);
    const crc = Buffer.alloc(4); crc.writeUInt32BE(crc32(Buffer.concat([t, data])), 0);
    return Buffer.concat([len, t, data, crc]);
  };
  return Buffer.concat([sig, chunk('IHDR', ihdr.subarray(0,13)), chunk('IDAT', idat), chunk('IEND', Buffer.alloc(0))]);
}

async function launch(userData: string) {
  const app = await electron.launch({ args: ['--user-data-dir=' + userData, MAIN_JS] });
  const page = await app.firstWindow();
  await page.waitForLoadState('domcontentloaded');
  const invoke = (ch: string, args: any) => page.evaluate(({ ch, args }) => (globalThis as any).dsh.invoke(ch, args), { ch, args });
  return { app, page, invoke };
}

test('背景图：上传+智能取色+持久化（FR-A8/A9）', async () => {
  const tmp = await fs.mkdtemp(nodePath.join(os.tmpdir(), 'hn-bg-'));
  const userData = nodePath.join(tmp, 'userdata');
  const vault = nodePath.join(tmp, 'vault');
  await fs.mkdir(userData, { recursive: true });
  await fs.mkdir(vault, { recursive: true });
  const pngPath = nodePath.join(tmp, 'white.png');
  await fs.writeFile(pngPath, makePng(255, 255, 255)); // 纯白 → 智能取色 mode=light, blur=12

  // 上传背景图 + 保存
  const a1 = await launch(userData);
  await a1.invoke('vault:switch', { root: vault });
  await a1.page.getByTitle('外观定制').click();
  await a1.page.locator('input[type="file"]').setInputFiles(pngPath);
  // 智能取色：白图 → blurPx 12（午夜蓝默认 16）
  await expect(a1.page.locator('img[alt="bg"]')).toBeVisible({ timeout: 10000 });
  await a1.page.getByRole('button', { name: '保存外观' }).click();
  await expect(a1.page.getByText('外观定制').first()).toBeHidden();
  await a1.app.close();

  // 重开：恢复背景图 + 智能取色结果
  const a2 = await launch(userData);
  const cfg: { bgImage: string | null } | null = await a2.invoke('appearance:load', null);
  expect(cfg?.bgImage).not.toBeNull();
  // 背景图层渲染
  await expect(a2.page.locator('div').filter({ hasText: '' }).first()).toBeTruthy();
  const blur = await a2.page.evaluate(() => getComputedStyle(document.documentElement).getPropertyValue('--blur-px').trim());
  expect(blur).toBe('12px');
  await a2.app.close();
});