import { mkdir, writeFile } from 'node:fs/promises'
import { createRequire } from 'node:module'
import path from 'node:path'

const require = createRequire(import.meta.url)
const engineVersion = String(require('../package.json').version)
const args = process.argv.slice(2)
const engineIndex = args.indexOf('--engine')
const engineSpec = engineIndex >= 0 ? args[engineIndex + 1] : `^${engineVersion}`
if (!engineSpec)
  throw new Error('--engine 需要 npm 版本、Git URL 或本地路径')
const targetInput = args.find((argument, index) => !argument.startsWith('-') && index !== engineIndex + 1) ?? '.'
const target = path.resolve(targetInput)

await mkdir(path.join(target, 'slides', 'welcome', 'assets'), { recursive: true })
await mkdir(path.join(target, '.github', 'workflows'), { recursive: true })

await writeNew('package.json', `${JSON.stringify({
  name: path.basename(target),
  private: true,
  scripts: {
    dev: 'easy-slides dev',
    present: 'easy-slides present',
    build: 'easy-slides build',
    check: 'easy-slides check',
    export: 'easy-slides export',
  },
  devDependencies: {
    '@easy-slides/cli': engineSpec,
  },
}, null, 2)}\n`)

await writeNew('easy-slides.config.mjs', `export default {
  title: '${escapeJavaScript(path.basename(target))}',
  description: 'Markdown presentations',
  slidesDir: 'slides',
  outDir: 'dist',
}
`)

await writeNew(path.join('slides', 'welcome', 'slides.md'), `---
title: Welcome
description: Your first easy-slides deck
date: ${new Date().toISOString().slice(0, 10)}
tags: [Markdown]
---

# Welcome

> Edit slides/welcome/slides.md and push to deploy.

<!--
Speaker notes are written in HTML comments.
-->

---

## Content lives here

- The engine is an npm dependency
- This repository owns slides and assets
- The static build can deploy anywhere
`)

await writeNew('.gitignore', `node_modules/
dist/
exports/
.env
.DS_Store
`)

await writeNew('pnpm-workspace.yaml', `allowBuilds:
  playwright-chromium: false
`)

await writeNew(path.join('.github', 'workflows', 'deploy-pages.yml'), `name: Deploy slides

on:
  push:
    branches: [main]
  workflow_dispatch:

permissions:
  contents: read
  pages: write
  id-token: write

jobs:
  deploy:
    runs-on: ubuntu-latest
    environment:
      name: github-pages
      url: \${{ steps.deployment.outputs.page_url }}
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
        with:
          version: 11.19.0
      - uses: actions/setup-node@v4
        with:
          node-version: 22
          cache: pnpm
      - run: pnpm install --frozen-lockfile
      - run: pnpm check
        env:
          PRESENTER_TOKEN: \${{ secrets.PRESENTER_TOKEN }}
      - run: pnpm build
        env:
          SITE_BASE: /\${{ github.event.repository.name }}/
          PRESENTER_TOKEN: \${{ secrets.PRESENTER_TOKEN }}
      - uses: actions/configure-pages@v5
      - uses: actions/upload-pages-artifact@v4
        with:
          path: dist
      - id: deployment
        uses: actions/deploy-pages@v4
`)

console.log(`内容项目已创建：${target}`)
console.log('下一步：pnpm install && pnpm dev -- welcome')

async function writeNew(relative: string, content: string) {
  const filename = path.join(target, relative)
  await mkdir(path.dirname(filename), { recursive: true })
  await writeFile(filename, content, { encoding: 'utf8', flag: 'wx' }).catch((error: NodeJS.ErrnoException) => {
    if (error.code === 'EEXIST')
      throw new Error(`拒绝覆盖已有文件：${filename}`)
    throw error
  })
}

function escapeJavaScript(value: string) {
  return value.replaceAll('\\', '\\\\').replaceAll("'", "\\'")
}