import { rmSync } from 'node:fs'
import path from 'node:path'
import { defineConfig } from 'vite'
import react from '@vitejs/plugin-react'
import electron from 'vite-plugin-electron/simple'
import pkg from './package.json'

export default defineConfig(({ command }) => {
  // Clean compiled Electron output on each build to avoid stale artefacts
  rmSync('dist-electron', { recursive: true, force: true })

  const isServe   = command === 'serve'
  const isBuild   = command === 'build'
  const sourcemap = isServe || !!process.env.VSCODE_DEBUG

  return {
    resolve: {
      alias: { '@': path.join(__dirname, 'src') },
    },
    plugins: [
      react(),
      electron({
        main: {
          // Main process entry — compiled to dist-electron/main/index.js
          entry: 'electron/main/index.js',
          onstart(args) {
            if (process.env.VSCODE_DEBUG) {
              console.log('[startup] Electron App')
            } else {
              args.startup()
            }
          },
          vite: {
            build: {
              sourcemap,
              minify: isBuild,
              outDir: 'dist-electron/main',
              rollupOptions: {
                // Keeps runtime dependencies out of the main bundle
                external: Object.keys(pkg.dependencies ?? {}),
              },
            },
          },
        },
        preload: {
          // Preload script — compiled to dist-electron/preload/index.cjs
          // Explicit CJS output is required: root package.json has "type":"module",
          // which makes Node.js treat .js and .mjs as ESM; .cjs is always CJS.
          input: 'electron/preload/index.js',
          vite: {
            build: {
              sourcemap: sourcemap ? 'inline' : undefined,
              minify: isBuild,
              outDir: 'dist-electron/preload',
              rollupOptions: {
                external: Object.keys(pkg.dependencies ?? {}),
                output: {
                  format: 'cjs',
                  entryFileNames: '[name].cjs',
                },
              },
            },
          },
        },
        // Polyfills Node built-ins used in the renderer process
        renderer: {},
      }),
    ],
    clearScreen: false,
  }
})