import { existsSync } from 'node:fs'
import path from 'node:path'
import { fileURLToPath } from 'node:url'

const directory = path.dirname(fileURLToPath(import.meta.url))
const bundledTheme = path.resolve(directory, '..', 'theme')
const workspaceTheme = path.resolve(directory, '..', '..', 'packages', 'slidev-theme-easy-jyy')

export function resolveTheme(theme?: string) {
  if (theme)
    return theme
  if (existsSync(path.join(bundledTheme, 'package.json')))
    return bundledTheme
  if (existsSync(path.join(workspaceTheme, 'package.json')))
    return workspaceTheme
  throw new Error('easy-slides 主题不存在；请重新安装或构建 @easy-slides/cli')
}