import { defineConfig, type PluginOption } from 'vite'
import vue from '@vitejs/plugin-vue'
import path from 'path'
import fs from 'fs'

// Copy translation catalogs (l10n/*.json, except the extractor-only
// en.manual.json) into static/l10n/ so the core shell can fetch them at
// /modules/{handle}/static/l10n/{locale}.json
const copyL10nCatalogs = (): PluginOption => ({
  name: 'copy-l10n-catalogs',
  apply: 'build',
  closeBundle() {
    const sourceDir = path.resolve(__dirname, 'l10n')
    const outDir = path.resolve(__dirname, 'static/l10n')
    if (!fs.existsSync(sourceDir)) return
    fs.mkdirSync(outDir, { recursive: true })
    for (const file of fs.readdirSync(sourceDir)) {
      if (file.endsWith('.json') && !file.endsWith('.manual.json')) {
        fs.copyFileSync(path.join(sourceDir, file), path.join(outDir, file))
      }
    }
  },
})

// Rewrite the __CSS_FILENAME_PLACEHOLDER__ export in main.ts with the actual
// hashed stylesheet name, so the core loader can inject it
const injectCssFilename = (): PluginOption => ({
  name: 'inject-css-filename',
  enforce: 'post',
  generateBundle(_options, bundle) {
    const cssFile = Object.keys(bundle).find(name => name.endsWith('.css'))
    if (!cssFile) return
    for (const fileName of Object.keys(bundle)) {
      const chunk = bundle[fileName]
      if (chunk.type === 'chunk' && chunk.code.includes('__CSS_FILENAME_PLACEHOLDER__')) {
        chunk.code = chunk.code.replace(/__CSS_FILENAME_PLACEHOLDER__/g, `static/${cssFile}`)
      }
    }
  },
})

// https://vite.dev/config/
export default defineConfig({
  plugins: [vue(), injectCssFilename(), copyL10nCatalogs()],
  resolve: {
    alias: {
      '@': path.resolve(__dirname, './src'),
      '@KTXC': path.resolve(__dirname, '../../core/src')
    },
  },
  build: {
    outDir: 'static',
    sourcemap: true,
    lib: {
      entry: path.resolve(__dirname, 'src/main.ts'),
      formats: ['es'],
      fileName: () => 'module.mjs',
    },
    rollupOptions: {
      external: ['vue', 'vue-router', 'pinia', '@KTXC'],
      output: {
        paths: (id) => (id === '@KTXC' ? '/js/ktxc.mjs' : id),
      },
    },
  },
})