import type { DocumentationExample } from './parser.ts'
import fs from 'node:fs'
import path from 'node:path'
import { Script } from 'node:vm'
import { build } from 'esbuild'
import { extractExamples } from './parser.ts'

export function collectExamples(directory: string, prefix = ''): DocumentationExample[] {
  return fs.readdirSync(directory, { withFileTypes: true }).sort((a, b) => a.name.localeCompare(b.name, 'en')).flatMap((entry) => {
    if (['en', '.vitepress', 'public', 'plugin'].includes(entry.name))
      return []
    const relative = prefix ? `${prefix}/${entry.name}` : entry.name
    const file = path.join(directory, entry.name)
    if (entry.isDirectory())
      return collectExamples(file, relative)
    if (!entry.name.endsWith('.md'))
      return []
    const examples = extractExamples(fs.readFileSync(file, 'utf8'), relative)
    for (const example of examples) {
      // eslint-disable-next-line no-new -- Compile syntax without executing documentation code.
      new Script(example.code, { filename: example.id })
    }
    return examples
  })
}

export async function generateDocumentationSmoke(root: string): Promise<Map<string, string>> {
  const examples = collectExamples(path.join(root, 'packages/artplayer-vitepress/docs'))
  const html = fs.readFileSync(path.join(root, 'docs/test/index.html'), 'utf8').replace(/<!--[\s\S]*?-->/g, '')
  const scripts = [...html.matchAll(/<script\b[^>]+\bsrc=["']([^"']+)["']/g)].map(match => match[1]!).filter(url => !['./chai.js', './mocha.js', './test.js'].includes(url))
  if (!scripts.some(url => /\/artplayer\.js$/.test(url)))
    throw new Error('Documentation smoke page must load the core')
  const bundle = await build({ stdin: { contents: `import { registerDocumentationSmoke } from './runtime.ts';\nregisterDocumentationSmoke(${JSON.stringify(examples)}, ${JSON.stringify(scripts)});`, resolveDir: path.join(root, 'scripts/docs-smoke'), sourcefile: 'documentation-smoke-entry.ts', loader: 'ts' }, bundle: true, write: false, platform: 'browser', format: 'iife', target: 'es2020', legalComments: 'none', logLevel: 'silent' })
  const script = bundle.outputFiles?.[0]?.text
  if (!script)
    throw new Error('Documentation smoke build produced no script')
  return new Map([
    ['docs/test/test.js', `// Generated by yarn build:test. Readiness smoke only; do not edit.\n${script}`],
    ['docs/test/examples.json', `${JSON.stringify({ scope: 'Chinese Run Code JavaScript; excludes en/plugin/public/.vitepress. Waits for created players to become ready, observes errors until that boundary, then destroys the frame. Not complete feature, delayed-callback or interaction acceptance.', examples, scripts }, null, 2)}\n`],
  ])
}