import { cp, mkdir, readFile, writeFile } from "node:fs/promises";
import { constants } from "node:fs";
import { access } from "node:fs/promises";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";

const projectRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");
const sourceRoot =
  process.env.TYPORA_THEME_DIR ??
  join(process.env.APPDATA ?? "", "Typora", "themes");
const sourceCss = join(sourceRoot, "github.css");
const sourceAssets = join(sourceRoot, "github");
const targetRoot = join(projectRoot, ".local", "themes", "typora-github");

async function assertReadable(path, label) {
  try {
    await access(path, constants.R_OK);
  } catch {
    throw new Error(`${label}不存在或不可读取：${path}`);
  }
}

await assertReadable(sourceCss, "Typora GitHub 主题");
await assertReadable(sourceAssets, "Typora GitHub 主题资源目录");

try {
  await access(targetRoot, constants.F_OK);
  throw new Error(
    `目标目录已存在：${targetRoot}\n请先人工确认并移走旧目录，再重新导入。`
  );
} catch (error) {
  if (error instanceof Error && error.message.startsWith("目标目录已存在")) {
    throw error;
  }
}

await mkdir(targetRoot, { recursive: true });
await cp(sourceAssets, join(targetRoot, "github"), {
  recursive: true,
  errorOnExist: true,
  force: false
});
await writeFile(
  join(targetRoot, "github.css"),
  await readFile(sourceCss, "utf8"),
  "utf8"
);

const manifest = {
  manifestVersion: 1,
  id: "typora-github",
  name: "Typora 默认（GitHub，本地）",
  version: "local",
  description:
    "从本机 Typora 安装导入，仅供当前设备个人使用，不进入 Git、容器或发布包。",
  author: "Typora",
  license: "本地个人使用，未随项目分发",
  entry: "github.css",
  domPreset: "typora",
  defaultFontSize: "16px",
  supportedFeatures: [
    "code",
    "table",
    "task-list",
    "footnote",
    "katex",
    "mermaid"
  ],
  bundled: false
};

await writeFile(
  join(targetRoot, "theme.json"),
  `${JSON.stringify(manifest, null, 2)}\n`,
  "utf8"
);

console.log(`已导入本地 Typora 主题：${targetRoot}`);