import type { ResolvedValaxyOptions } from 'valaxy'
import type { Plugin } from 'vite'
import type { ThemeConfig } from '../types'
import { promises as fs } from 'node:fs'
import path, { basename } from 'node:path'

// write a vite plugin
// https://vitejs.dev/guide/api-plugin.html
export function themePlugin(options: ResolvedValaxyOptions<ThemeConfig>): Plugin {
  const themeConfig = options.config.themeConfig || {}

  return {
    name: 'valaxy-theme-starter',

    config() {
      return {
        css: {
          preprocessorOptions: {
            scss: {
              additionalData: `$c-primary: ${themeConfig.colors?.primary || '#0078E7'} !default;`,
            },
          },
        },

        valaxy: {},
      }
    },
  }
}

/**
 * @see https://github.com/vitejs/vite/issues/14102
 *
 * Since `import.meta.glob` does not support dynamic imports, this plugin is created to generate a list of dynamic imports
 * and inject them into the code. This is used to load user resource files, such as using `import.meta.glob('@valaxy-blog/pages/demos/*.mp4', { eager: true, query: '?url', import: 'default' })`
 * to access user files in themes.
 * Reference https://github.com/vitejs/vite/issues/2351
 */
export function ValaxyBlogPlugin({ prefix = '@valaxy-blog/' }: { prefix?: string } = {}): Plugin {
  const sourceFromId = (id: string) => id.slice(prefix.length)
  return {
    name: `ValaxyBlogPlugin`,
    enforce: 'pre',

    async resolveId(id: string): Promise<any> {
      if (id.startsWith(prefix)) {
        return path.resolve(`./${sourceFromId(id)}`)
      }
    },

    async load(id: string): Promise<any> {
      if (id.startsWith(prefix)) {
        const source = sourceFromId(id)
        const data = await fs.readFile(source, 'utf8')

        this.addWatchFile(source)
        const emitted = this.emitFile({
          name: basename(source),
          source: `${data}`,
          type: 'asset',
        })

        return `
        export default import.meta.ROLLUP_FILE_URL_${emitted}
        `
      }
    },
  }
}