import { defineConfig } from 'vitest/config'
import { svelte } from '@sveltejs/vite-plugin-svelte'
import { svelteTesting } from '@testing-library/svelte/vite'
import { fileURLToPath, URL } from 'node:url'
import { readFileSync, readdirSync } from 'node:fs'
import type { Plugin } from 'vite'

const RUFFLE_DIRECTORY = fileURLToPath(
  new URL('./node_modules/@ruffle-rs/ruffle/', import.meta.url),
)
const RUFFLE_ASSET_PATTERN = /^(?:ruffle\.js|core\.ruffle\..+\.js|.+\.wasm|LICENSE_(?:MIT|APACHE))$/

/** Serve and emit the pinned self-hosted runtime without a third-party CDN. */
function ruffleAssets(): Plugin {
  const files = readdirSync(RUFFLE_DIRECTORY).filter((name) => RUFFLE_ASSET_PATTERN.test(name))
  let building = false

  return {
    name: 'plspace-ruffle-assets',
    configResolved(config) {
      building = config.command === 'build'
    },
    buildStart() {
      if (!building) return
      for (const name of files) {
        this.emitFile({
          type: 'asset',
          fileName: `ruffle/${name}`,
          source: readFileSync(`${RUFFLE_DIRECTORY}/${name}`),
        })
      }
    },
    configureServer(server) {
      server.middlewares.use('/ruffle', (request, response, next) => {
        const name = decodeURIComponent((request.url ?? '').replace(/^\//, '').split('?')[0])
        if (!files.includes(name)) {
          next()
          return
        }
        response.setHeader(
          'Content-Type',
          name.endsWith('.wasm') ? 'application/wasm' : name.endsWith('.js') ? 'text/javascript' : 'text/plain',
        )
        response.end(readFileSync(`${RUFFLE_DIRECTORY}/${name}`))
      })
    },
  }
}

// Fully static output: the app talks to a Mastodon/Pleroma server directly from
// the browser, so `dist/` can be dropped on any static host (or file://-ish CDN).
export default defineConfig({
  base: './',
  plugins: [svelte(), svelteTesting(), ruffleAssets()],
  resolve: {
    alias: {
      $lib: fileURLToPath(new URL('./src/lib', import.meta.url)),
      $components: fileURLToPath(new URL('./src/components', import.meta.url)),
      $routes: fileURLToPath(new URL('./src/routes', import.meta.url)),
      $test: fileURLToPath(new URL('./src/test', import.meta.url)),
    },
  },
  build: {
    target: 'es2022',
    cssCodeSplit: false,
  },
  test: {
    environment: 'jsdom',
    environmentOptions: {
      jsdom: { url: 'https://plspace.test/' },
    },
    setupFiles: ['./src/test/setup.ts'],
  },
})